|  |  |  | GTK+ Reference Manual |  | 
|---|
| GtkWidgetGtkWidget — Base class for all widgets | 
#include <gtk/gtk.h>
            GtkWidget;
            GtkWidgetClass;
enum        GtkWidgetFlags;
#define     GTK_WIDGET_TYPE                 (wid)
#define     GTK_WIDGET_STATE                (wid)
#define     GTK_WIDGET_SAVED_STATE          (wid)
#define     GTK_WIDGET_FLAGS                (wid)
#define     GTK_WIDGET_TOPLEVEL             (wid)
#define     GTK_WIDGET_NO_WINDOW            (wid)
#define     GTK_WIDGET_REALIZED             (wid)
#define     GTK_WIDGET_MAPPED               (wid)
#define     GTK_WIDGET_VISIBLE              (wid)
#define     GTK_WIDGET_DRAWABLE             (wid)
#define     GTK_WIDGET_SENSITIVE            (wid)
#define     GTK_WIDGET_PARENT_SENSITIVE     (wid)
#define     GTK_WIDGET_IS_SENSITIVE         (wid)
#define     GTK_WIDGET_CAN_FOCUS            (wid)
#define     GTK_WIDGET_HAS_FOCUS            (wid)
#define     GTK_WIDGET_CAN_DEFAULT          (wid)
#define     GTK_WIDGET_RECEIVES_DEFAULT     (wid)
#define     GTK_WIDGET_HAS_DEFAULT          (wid)
#define     GTK_WIDGET_HAS_GRAB             (wid)
#define     GTK_WIDGET_RC_STYLE             (wid)
#define     GTK_WIDGET_COMPOSITE_CHILD      (wid)
#define     GTK_WIDGET_APP_PAINTABLE        (wid)
#define     GTK_WIDGET_DOUBLE_BUFFERED      (wid)
#define     GTK_WIDGET_SET_FLAGS            (wid,flag)
#define     GTK_WIDGET_UNSET_FLAGS          (wid,flag)
void        (*GtkCallback)                  (GtkWidget *widget,
                                             gpointer data);
            GtkRequisition;
struct      GtkAllocation;
            GtkSelectionData;
            GtkWidgetAuxInfo;
            GtkWidgetShapeInfo;
enum        GtkWidgetHelpType;
GtkWidget*  gtk_widget_new                  (GType type,
                                             const gchar *first_property_name,
                                             ...);
GtkWidget*  gtk_widget_ref                  (GtkWidget *widget);
void        gtk_widget_unref                (GtkWidget *widget);
void        gtk_widget_destroy              (GtkWidget *widget);
void        gtk_widget_destroyed            (GtkWidget *widget,
                                             GtkWidget **widget_pointer);
void        gtk_widget_set                  (GtkWidget *widget,
                                             const gchar *first_property_name,
                                             ...);
void        gtk_widget_unparent             (GtkWidget *widget);
void        gtk_widget_show                 (GtkWidget *widget);
void        gtk_widget_show_now             (GtkWidget *widget);
void        gtk_widget_hide                 (GtkWidget *widget);
void        gtk_widget_show_all             (GtkWidget *widget);
void        gtk_widget_hide_all             (GtkWidget *widget);
void        gtk_widget_map                  (GtkWidget *widget);
void        gtk_widget_unmap                (GtkWidget *widget);
void        gtk_widget_realize              (GtkWidget *widget);
void        gtk_widget_unrealize            (GtkWidget *widget);
void        gtk_widget_queue_draw           (GtkWidget *widget);
void        gtk_widget_queue_resize         (GtkWidget *widget);
void        gtk_widget_queue_resize_no_redraw
                                            (GtkWidget *widget);
void        gtk_widget_draw                 (GtkWidget *widget,
                                             GdkRectangle *area);
void        gtk_widget_size_request         (GtkWidget *widget,
                                             GtkRequisition *requisition);
void        gtk_widget_get_child_requisition
                                            (GtkWidget *widget,
                                             GtkRequisition *requisition);
void        gtk_widget_size_allocate        (GtkWidget *widget,
                                             GtkAllocation *allocation);
void        gtk_widget_add_accelerator      (GtkWidget *widget,
                                             const gchar *accel_signal,
                                             GtkAccelGroup *accel_group,
                                             guint accel_key,
                                             GdkModifierType accel_mods,
                                             GtkAccelFlags accel_flags);
gboolean    gtk_widget_remove_accelerator   (GtkWidget *widget,
                                             GtkAccelGroup *accel_group,
                                             guint accel_key,
                                             GdkModifierType accel_mods);
void        gtk_widget_set_accel_path       (GtkWidget *widget,
                                             const gchar *accel_path,
                                             GtkAccelGroup *accel_group);
GList*      gtk_widget_list_accel_closures  (GtkWidget *widget);
gboolean    gtk_widget_can_activate_accel   (GtkWidget *widget,
                                             guint signal_id);
gboolean    gtk_widget_event                (GtkWidget *widget,
                                             GdkEvent *event);
gboolean    gtk_widget_activate             (GtkWidget *widget);
void        gtk_widget_reparent             (GtkWidget *widget,
                                             GtkWidget *new_parent);
gboolean    gtk_widget_intersect            (GtkWidget *widget,
                                             GdkRectangle *area,
                                             GdkRectangle *intersection);
gboolean    gtk_widget_is_focus             (GtkWidget *widget);
void        gtk_widget_grab_focus           (GtkWidget *widget);
void        gtk_widget_grab_default         (GtkWidget *widget);
void        gtk_widget_set_name             (GtkWidget *widget,
                                             const gchar *name);
const gchar* gtk_widget_get_name            (GtkWidget *widget);
void        gtk_widget_set_state            (GtkWidget *widget,
                                             GtkStateType state);
void        gtk_widget_set_sensitive        (GtkWidget *widget,
                                             gboolean sensitive);
void        gtk_widget_set_parent           (GtkWidget *widget,
                                             GtkWidget *parent);
void        gtk_widget_set_parent_window    (GtkWidget *widget,
                                             GdkWindow *parent_window);
GdkWindow*  gtk_widget_get_parent_window    (GtkWidget *widget);
void        gtk_widget_set_uposition        (GtkWidget *widget,
                                             gint x,
                                             gint y);
void        gtk_widget_set_usize            (GtkWidget *widget,
                                             gint width,
                                             gint height);
void        gtk_widget_set_events           (GtkWidget *widget,
                                             gint events);
void        gtk_widget_add_events           (GtkWidget *widget,
                                             gint events);
void        gtk_widget_set_extension_events (GtkWidget *widget,
                                             GdkExtensionMode mode);
GdkExtensionMode gtk_widget_get_extension_events
                                            (GtkWidget *widget);
GtkWidget*  gtk_widget_get_toplevel         (GtkWidget *widget);
GtkWidget*  gtk_widget_get_ancestor         (GtkWidget *widget,
                                             GType widget_type);
GdkColormap* gtk_widget_get_colormap        (GtkWidget *widget);
void        gtk_widget_set_colormap         (GtkWidget *widget,
                                             GdkColormap *colormap);
GdkVisual*  gtk_widget_get_visual           (GtkWidget *widget);
gint        gtk_widget_get_events           (GtkWidget *widget);
void        gtk_widget_get_pointer          (GtkWidget *widget,
                                             gint *x,
                                             gint *y);
gboolean    gtk_widget_is_ancestor          (GtkWidget *widget,
                                             GtkWidget *ancestor);
gboolean    gtk_widget_translate_coordinates
                                            (GtkWidget *src_widget,
                                             GtkWidget *dest_widget,
                                             gint src_x,
                                             gint src_y,
                                             gint *dest_x,
                                             gint *dest_y);
gboolean    gtk_widget_hide_on_delete       (GtkWidget *widget);
void        gtk_widget_set_style            (GtkWidget *widget,
                                             GtkStyle *style);
#define     gtk_widget_set_rc_style         (widget)
void        gtk_widget_ensure_style         (GtkWidget *widget);
GtkStyle*   gtk_widget_get_style            (GtkWidget *widget);
#define     gtk_widget_restore_default_style(widget)
void        gtk_widget_reset_rc_styles      (GtkWidget *widget);
void        gtk_widget_push_colormap        (GdkColormap *cmap);
void        gtk_widget_pop_colormap         (void);
void        gtk_widget_set_default_colormap (GdkColormap *colormap);
GtkStyle*   gtk_widget_get_default_style    (void);
GdkColormap* gtk_widget_get_default_colormap
                                            (void);
GdkVisual*  gtk_widget_get_default_visual   (void);
void        gtk_widget_set_direction        (GtkWidget *widget,
                                             GtkTextDirection dir);
enum        GtkTextDirection;
GtkTextDirection gtk_widget_get_direction   (GtkWidget *widget);
void        gtk_widget_set_default_direction
                                            (GtkTextDirection dir);
GtkTextDirection gtk_widget_get_default_direction
                                            (void);
void        gtk_widget_shape_combine_mask   (GtkWidget *widget,
                                             GdkBitmap *shape_mask,
                                             gint offset_x,
                                             gint offset_y);
void        gtk_widget_path                 (GtkWidget *widget,
                                             guint *path_length,
                                             gchar **path,
                                             gchar **path_reversed);
void        gtk_widget_class_path           (GtkWidget *widget,
                                             guint *path_length,
                                             gchar **path,
                                             gchar **path_reversed);
gchar*      gtk_widget_get_composite_name   (GtkWidget *widget);
void        gtk_widget_modify_style         (GtkWidget *widget,
                                             GtkRcStyle *style);
GtkRcStyle* gtk_widget_get_modifier_style   (GtkWidget *widget);
void        gtk_widget_modify_fg            (GtkWidget *widget,
                                             GtkStateType state,
                                             const GdkColor *color);
void        gtk_widget_modify_bg            (GtkWidget *widget,
                                             GtkStateType state,
                                             const GdkColor *color);
void        gtk_widget_modify_text          (GtkWidget *widget,
                                             GtkStateType state,
                                             const GdkColor *color);
void        gtk_widget_modify_base          (GtkWidget *widget,
                                             GtkStateType state,
                                             const GdkColor *color);
void        gtk_widget_modify_font          (GtkWidget *widget,
                                             PangoFontDescription *font_desc);
PangoContext* gtk_widget_create_pango_context
                                            (GtkWidget *widget);
PangoContext* gtk_widget_get_pango_context  (GtkWidget *widget);
PangoLayout* gtk_widget_create_pango_layout (GtkWidget *widget,
                                             const gchar *text);
GdkPixbuf*  gtk_widget_render_icon          (GtkWidget *widget,
                                             const gchar *stock_id,
                                             GtkIconSize size,
                                             const gchar *detail);
void        gtk_widget_pop_composite_child  (void);
void        gtk_widget_push_composite_child (void);
void        gtk_widget_queue_clear          (GtkWidget *widget);
void        gtk_widget_queue_clear_area     (GtkWidget *widget,
                                             gint x,
                                             gint y,
                                             gint width,
                                             gint height);
void        gtk_widget_queue_draw_area      (GtkWidget *widget,
                                             gint x,
                                             gint y,
                                             gint width,
                                             gint height);
void        gtk_widget_reset_shapes         (GtkWidget *widget);
void        gtk_widget_set_app_paintable    (GtkWidget *widget,
                                             gboolean app_paintable);
void        gtk_widget_set_double_buffered  (GtkWidget *widget,
                                             gboolean double_buffered);
void        gtk_widget_set_redraw_on_allocate
                                            (GtkWidget *widget,
                                             gboolean redraw_on_allocate);
void        gtk_widget_set_composite_name   (GtkWidget *widget,
                                             const gchar *name);
gboolean    gtk_widget_set_scroll_adjustments
                                            (GtkWidget *widget,
                                             GtkAdjustment *hadjustment,
                                             GtkAdjustment *vadjustment);
gboolean    gtk_widget_mnemonic_activate    (GtkWidget *widget,
                                             gboolean group_cycling);
void        gtk_widget_class_install_style_property
                                            (GtkWidgetClass *klass,
                                             GParamSpec *pspec);
void        gtk_widget_class_install_style_property_parser
                                            (GtkWidgetClass *klass,
                                             GParamSpec *pspec,
                                             GtkRcPropertyParser parser);
GParamSpec* gtk_widget_class_find_style_property
                                            (GtkWidgetClass *klass,
                                             const gchar *property_name);
GParamSpec** gtk_widget_class_list_style_properties
                                            (GtkWidgetClass *klass,
                                             guint *n_properties);
GdkRegion*  gtk_widget_region_intersect     (GtkWidget *widget,
                                             GdkRegion *region);
gint        gtk_widget_send_expose          (GtkWidget *widget,
                                             GdkEvent *event);
void        gtk_widget_style_get            (GtkWidget *widget,
                                             const gchar *first_property_name,
                                             ...);
void        gtk_widget_style_get_property   (GtkWidget *widget,
                                             const gchar *property_name,
                                             GValue *value);
void        gtk_widget_style_get_valist     (GtkWidget *widget,
                                             const gchar *first_property_name,
                                             va_list var_args);
AtkObject*  gtk_widget_get_accessible       (GtkWidget *widget);
gboolean    gtk_widget_child_focus          (GtkWidget *widget,
                                             GtkDirectionType direction);
void        gtk_widget_child_notify         (GtkWidget *widget,
                                             const gchar *child_property);
void        gtk_widget_freeze_child_notify  (GtkWidget *widget);
gboolean    gtk_widget_get_child_visible    (GtkWidget *widget);
GtkWidget*  gtk_widget_get_parent           (GtkWidget *widget);
GtkSettings* gtk_widget_get_settings        (GtkWidget *widget);
GtkClipboard* gtk_widget_get_clipboard      (GtkWidget *widget,
                                             GdkAtom selection);
GdkDisplay* gtk_widget_get_display          (GtkWidget *widget);
GdkWindow*  gtk_widget_get_root_window      (GtkWidget *widget);
GdkScreen*  gtk_widget_get_screen           (GtkWidget *widget);
gboolean    gtk_widget_has_screen           (GtkWidget *widget);
void        gtk_widget_get_size_request     (GtkWidget *widget,
                                             gint *width,
                                             gint *height);
#define     gtk_widget_pop_visual           ()
#define     gtk_widget_push_visual          (visual)
void        gtk_widget_set_child_visible    (GtkWidget *widget,
                                             gboolean is_visible);
#define     gtk_widget_set_default_visual   (visual)
void        gtk_widget_set_size_request     (GtkWidget *widget,
                                             gint width,
                                             gint height);
#define     gtk_widget_set_visual           (widget,visual)
void        gtk_widget_thaw_child_notify    (GtkWidget *widget);
void        gtk_widget_set_no_show_all      (GtkWidget *widget,
                                             gboolean no_show_all);
gboolean    gtk_widget_get_no_show_all      (GtkWidget *widget);
GList*      gtk_widget_list_mnemonic_labels (GtkWidget *widget);
void        gtk_widget_add_mnemonic_label   (GtkWidget *widget,
                                             GtkWidget *label);
void        gtk_widget_remove_mnemonic_label
                                            (GtkWidget *widget,
                                             GtkWidget *label);
GtkRequisition* gtk_requisition_copy        (const GtkRequisition *requisition);
void        gtk_requisition_free            (GtkRequisition *requisition);
GObject +----GtkObject +----GtkWidget +----GtkContainer +----GtkMisc +----GtkCalendar +----GtkCellView +----GtkDrawingArea +----GtkEntry +----GtkRuler +----GtkRange +----GtkSeparator +----GtkInvisible +----GtkOldEditable +----GtkPreview +----GtkProgress
"app-paintable" gboolean : Read / Write "can-default" gboolean : Read / Write "can-focus" gboolean : Read / Write "composite-child" gboolean : Read "events" GdkEventMask : Read / Write "extension-events" GdkExtensionMode : Read / Write "has-default" gboolean : Read / Write "has-focus" gboolean : Read / Write "height-request" gint : Read / Write "is-focus" gboolean : Read / Write "name" gchararray : Read / Write "no-show-all" gboolean : Read / Write "parent" GtkContainer : Read / Write "receives-default" gboolean : Read / Write "sensitive" gboolean : Read / Write "style" GtkStyle : Read / Write "visible" gboolean : Read / Write "width-request" gint : Read / Write
"cursor-aspect-ratio" gfloat : Read "cursor-color" GdkColor : Read "draw-border" GtkBorder : Read "focus-line-pattern" gchararray : Read "focus-line-width" gint : Read "focus-padding" gint : Read "interior-focus" gboolean : Read "secondary-cursor-color" GdkColor : Read
"accel-closures-changed" void user_function (GtkWidget *widget, gpointer user_data); "button-press-event" gboolean user_function (GtkWidget *widget, GdkEventButton *event, gpointer user_data); "button-release-event" gboolean user_function (GtkWidget *widget, GdkEventButton *event, gpointer user_data); "can-activate-accel" gboolean user_function (GtkWidget *widget, guint signal_id, gpointer user_data); "child-notify" void user_function (GtkWidget *widget, GParamSpec *pspec, gpointer user_data); "client-event" gboolean user_function (GtkWidget *widget, GdkEventClient *event, gpointer user_data); "configure-event" gboolean user_function (GtkWidget *widget, GdkEventConfigure *event, gpointer user_data); "delete-event" gboolean user_function (GtkWidget *widget, GdkEvent *event, gpointer user_data); "destroy-event" gboolean user_function (GtkWidget *widget, GdkEvent *event, gpointer user_data); "direction-changed" void user_function (GtkWidget *widget, GtkTextDirection arg1, gpointer user_data); "drag-begin" void user_function (GtkWidget *widget, GdkDragContext *drag_context, gpointer user_data); "drag-data-delete" void user_function (GtkWidget *widget, GdkDragContext *drag_context, gpointer user_data); "drag-data-get" void user_function (GtkWidget *widget, GdkDragContext *drag_context, GtkSelectionData *data, guint info, guint time, gpointer user_data); "drag-data-received" void user_function (GtkWidget *widget, GdkDragContext *drag_context, gint x, gint y, GtkSelectionData *data, guint info, guint time, gpointer user_data); "drag-drop" gboolean user_function (GtkWidget *widget, GdkDragContext *drag_context, gint x, gint y, guint time, gpointer user_data); "drag-end" void user_function (GtkWidget *widget, GdkDragContext *drag_context, gpointer user_data); "drag-leave" void user_function (GtkWidget *widget, GdkDragContext *drag_context, guint time, gpointer user_data); "drag-motion" gboolean user_function (GtkWidget *widget, GdkDragContext *drag_context, gint x, gint y, guint time, gpointer user_data); "enter-notify-event" gboolean user_function (GtkWidget *widget, GdkEventCrossing *event, gpointer user_data); "event" gboolean user_function (GtkWidget *widget, GdkEvent *event, gpointer user_data); "event-after" void user_function (GtkWidget *widget, GdkEvent *event, gpointer user_data); "expose-event" gboolean user_function (GtkWidget *widget, GdkEventExpose *event, gpointer user_data); "focus" gboolean user_function (GtkWidget *widget, GtkDirectionType arg1, gpointer user_data); "focus-in-event" gboolean user_function (GtkWidget *widget, GdkEventFocus *event, gpointer user_data); "focus-out-event" gboolean user_function (GtkWidget *widget, GdkEventFocus *event, gpointer user_data); "grab-broken-event" gboolean user_function (GtkWidget *widget, GdkEvent *event, gpointer user_data); "grab-focus" void user_function (GtkWidget *widget, gpointer user_data); "grab-notify" void user_function (GtkWidget *widget, gboolean arg1, gpointer user_data); "hide" void user_function (GtkWidget *widget, gpointer user_data); "hierarchy-changed" void user_function (GtkWidget *widget, GtkWidget *widget2, gpointer user_data); "key-press-event" gboolean user_function (GtkWidget *widget, GdkEventKey *event, gpointer user_data); "key-release-event" gboolean user_function (GtkWidget *widget, GdkEventKey *event, gpointer user_data); "leave-notify-event" gboolean user_function (GtkWidget *widget, GdkEventCrossing *event, gpointer user_data); "map" void user_function (GtkWidget *widget, gpointer user_data); "map-event" gboolean user_function (GtkWidget *widget, GdkEvent *event, gpointer user_data); "mnemonic-activate" gboolean user_function (GtkWidget *widget, gboolean arg1, gpointer user_data); "motion-notify-event" gboolean user_function (GtkWidget *widget, GdkEventMotion *event, gpointer user_data); "no-expose-event" gboolean user_function (GtkWidget *widget, GdkEventNoExpose *event, gpointer user_data); "parent-set" void user_function (GtkWidget *widget, GtkObject *old_parent, gpointer user_data); "popup-menu" gboolean user_function (GtkWidget *widget, gpointer user_data); "property-notify-event" gboolean user_function (GtkWidget *widget, GdkEventProperty *event, gpointer user_data); "proximity-in-event" gboolean user_function (GtkWidget *widget, GdkEventProximity *event, gpointer user_data); "proximity-out-event" gboolean user_function (GtkWidget *widget, GdkEventProximity *event, gpointer user_data); "realize" void user_function (GtkWidget *widget, gpointer user_data); "screen-changed" void user_function (GtkWidget *widget, GdkScreen *arg1, gpointer user_data); "scroll-event" gboolean user_function (GtkWidget *widget, GdkEventScroll *event, gpointer user_data); "selection-clear-event" gboolean user_function (GtkWidget *widget, GdkEventSelection *event, gpointer user_data); "selection-get" void user_function (GtkWidget *widget, GtkSelectionData *data, guint info, guint time, gpointer user_data); "selection-notify-event" gboolean user_function (GtkWidget *widget, GdkEventSelection *event, gpointer user_data); "selection-received" void user_function (GtkWidget *widget, GtkSelectionData *data, guint time, gpointer user_data); "selection-request-event" gboolean user_function (GtkWidget *widget, GdkEventSelection *event, gpointer user_data); "show" void user_function (GtkWidget *widget, gpointer user_data); "show-help" gboolean user_function (GtkWidget *widget, GtkWidgetHelpType arg1, gpointer user_data); "size-allocate" void user_function (GtkWidget *widget, GtkAllocation *allocation, gpointer user_data); "size-request" void user_function (GtkWidget *widget, GtkRequisition *requisition, gpointer user_data); "state-changed" void user_function (GtkWidget *widget, GtkStateType state, gpointer user_data); "style-set" void user_function (GtkWidget *widget, GtkStyle *previous_style, gpointer user_data); "unmap" void user_function (GtkWidget *widget, gpointer user_data); "unmap-event" gboolean user_function (GtkWidget *widget, GdkEvent *event, gpointer user_data); "unrealize" void user_function (GtkWidget *widget, gpointer user_data); "visibility-notify-event" gboolean user_function (GtkWidget *widget, GdkEventVisibility *event, gpointer user_data); "window-state-event" gboolean user_function (GtkWidget *widget, GdkEventWindowState *event, gpointer user_data);
GtkWidget introduces style properties - these are basically object properties that are stored not on the object, but in the style object associated to the widget. Style properties are set in resource files. This mechanism is used for configuring such things as the location of the scrollbar arrows through the theme, giving theme authors more control over the look of applications without the need to write a theme engine in C.
Use gtk_widget_class_install_style_property() to install style properties for 
a widget class, gtk_widget_class_find_style_property() or
gtk_widget_class_list_style_properties() to get information about existing
style properties and gtk_widget_style_get_property(), gtk_widget_style_get() or
gtk_widget_style_get_valist() to obtain the value of a style property.
typedef struct {
  /* The style for the widget. The style contains the
   *  colors the widget should be drawn in for each state
   *  along with graphics contexts used to draw with and
   *  the font to use for text.
   */
  GtkStyle *style;
  
  /* The widget's desired size.
   */
  GtkRequisition requisition;
  
  /* The widget's allocated size.
   */
  GtkAllocation allocation;
  
  /* The widget's window or its parent window if it does
   *  not have a window. (Which will be indicated by the
   *  GTK_NO_WINDOW flag being set).
   */
  GdkWindow *window;
  
  /* The widget's parent.
   */
  GtkWidget *parent;
} GtkWidget;
| GtkStyle * style; | The style for the widget. The style contains the colors the widget should be drawn in for each state along with graphics contexts used to draw with and the font to use for text. | 
| GtkRequisition requisition; | The widget's desired size. | 
| GtkAllocation allocation; | The widget's allocated size. | 
| GdkWindow * window; | The widget's window or its parent window if it does not have a window. (Which will be indicated by the GTK_NO_WINDOW flag being set). | 
| GtkWidget * parent; | 
typedef struct {
  /* The object class structure needs to be the first
   *  element in the widget class structure in order for
   *  the class mechanism to work correctly. This allows a
   *  GtkWidgetClass pointer to be cast to a GtkObjectClass
   *  pointer.
   */
  GtkObjectClass parent_class;
  
  guint activate_signal;
  guint set_scroll_adjustments_signal;
} GtkWidgetClass;
activate_signal
The signal to emit when a widget of this class is activated,
gtk_widget_activate() handles the emission. Implementation of this
signal is optional. 
set_scroll_adjustment_signal
This signal is emitted  when a widget of this class is added
to a scrolling aware parent, gtk_widget_set_scroll_adjustments()
handles the emission.
Implementation of this signal is optional.
typedef enum
{
  GTK_TOPLEVEL         = 1 << 4,
  GTK_NO_WINDOW        = 1 << 5,
  GTK_REALIZED         = 1 << 6,
  GTK_MAPPED           = 1 << 7,
  GTK_VISIBLE          = 1 << 8,
  GTK_SENSITIVE        = 1 << 9,
  GTK_PARENT_SENSITIVE = 1 << 10,
  GTK_CAN_FOCUS        = 1 << 11,
  GTK_HAS_FOCUS        = 1 << 12,
  /* widget is allowed to receive the default via gtk_widget_grab_default
   * and will reserve space to draw the default if possible
   */
  GTK_CAN_DEFAULT      = 1 << 13,
  /* the widget currently is receiving the default action and should be drawn
   * appropriately if possible
   */
  GTK_HAS_DEFAULT      = 1 << 14,
  GTK_HAS_GRAB	       = 1 << 15,
  GTK_RC_STYLE	       = 1 << 16,
  GTK_COMPOSITE_CHILD  = 1 << 17,
  GTK_NO_REPARENT      = 1 << 18,
  GTK_APP_PAINTABLE    = 1 << 19,
  /* the widget when focused will receive the default action and have
   * HAS_DEFAULT set even if there is a different widget set as default
   */
  GTK_RECEIVES_DEFAULT = 1 << 20,
  GTK_DOUBLE_BUFFERED  = 1 << 21,
  GTK_NO_SHOW_ALL      = 1 << 22
} GtkWidgetFlags;
Tells about certain properties of the widget.
| GTK_TOPLEVEL | widgets without a real parent, as there are GtkWindows and GtkMenus have this flag set throughout their lifetime. Toplevel widgets always contain their own GdkWindow. | 
| GTK_NO_WINDOW | Indicative for a widget that does not provide its own GdkWindow. Visible action (e.g. drawing) is performed on the parent's GdkWindow. | 
| GTK_REALIZED | Set by gtk_widget_realize(), unset bygtk_widget_unrealize().
        A realized widget has an associated GdkWindow. | 
| GTK_MAPPED | Set by gtk_widget_map(), unset bygtk_widget_unmap().
        Only realized widgets can be mapped. It means thatgdk_window_show()has been called on the widgets window(s). | 
| GTK_VISIBLE | Set by gtk_widget_show(), unset bygtk_widget_hide(). Implies that a 
        widget will be mapped as soon as its parent is mapped. | 
| GTK_SENSITIVE | Set and unset by gtk_widget_set_sensitive().
        The sensitivity of a widget determines whether it will receive
        certain events (e.g. button or key presses). One premise for
        the widget's sensitivity is to have this flag set. | 
| GTK_PARENT_SENSITIVE | Set and unset by gtk_widget_set_sensitive()operations on the
        parents of the widget.
        This is the second premise for the widget's sensitivity. Once
        it hasGTK_SENSITIVEandGTK_PARENT_SENSITIVEset, its state is
        effectively sensitive. This is expressed (and can be examined) by
        the GTK_WIDGET_IS_SENSITIVE macro. | 
| GTK_CAN_FOCUS | Determines whether a widget is able to handle focus grabs. | 
| GTK_HAS_FOCUS | Set by gtk_widget_grab_focus()for widgets that also
        haveGTK_CAN_FOCUSset. The flag will be unset once another widget
        grabs the focus. | 
| GTK_CAN_DEFAULT | The widget is allowed to receive the default action via gtk_widget_grab_default(). | 
| GTK_HAS_DEFAULT | The widget currently is receiving the default action. | 
| GTK_HAS_GRAB | Set by gtk_grab_add(), unset bygtk_grab_remove(). It means that the 
        widget is in the grab_widgets stack, and will be the preferred one for 
        receiving events other than ones of cosmetic value. | 
| GTK_RC_STYLE | Indicates that the widget's style has been looked up through the rc mechanism. It does not imply that the widget actually had a style defined through the rc mechanism. | 
| GTK_COMPOSITE_CHILD | Indicates that the widget is a composite child of its parent; see gtk_widget_push_composite_child(),gtk_widget_pop_composite_child(). | 
| GTK_NO_REPARENT | Unused since before GTK+ 1.2, will be removed in a future version. | 
| GTK_APP_PAINTABLE | Set and unset by gtk_widget_set_app_paintable().
        Must be set on widgets whose window the application directly draws on, 
	in order to keep GTK+ from overwriting the drawn stuff. | 
| GTK_RECEIVES_DEFAULT | The widget when focused will receive the default action and have GTK_HAS_DEFAULTset even if there is a different widget set as default. | 
| GTK_DOUBLE_BUFFERED | Set and unset by gtk_widget_set_double_buffered().
        Indicates that exposes done on the widget should be double-buffered. | 
| GTK_NO_SHOW_ALL | 
#define GTK_WIDGET_TYPE(wid) (GTK_OBJECT_TYPE (wid))
Gets the type of a widget.
| wid: | a GtkWidget. | 
#define GTK_WIDGET_STATE(wid) (GTK_WIDGET (wid)->state)
Returns the current state of the widget, as a GtkStateType.
| wid: | a GtkWidget. | 
#define GTK_WIDGET_SAVED_STATE(wid) (GTK_WIDGET (wid)->saved_state)
Returns the saved state of the widget, as a GtkStateType.
The saved state will be restored when a widget gets sensitive
again, after it has been made insensitive with gtk_widget_set_state()
or gtk_widget_set_sensitive().
| wid: | a GtkWidget. | 
#define GTK_WIDGET_FLAGS(wid) (GTK_OBJECT_FLAGS (wid))
Returns the widget flags from wid.
| wid: | a GtkWidget. | 
#define GTK_WIDGET_TOPLEVEL(wid) ((GTK_WIDGET_FLAGS (wid) & GTK_TOPLEVEL) != 0)
Evaluates to TRUE if the widget is a toplevel widget.
| wid: | a GtkWidget. | 
#define GTK_WIDGET_NO_WINDOW(wid) ((GTK_WIDGET_FLAGS (wid) & GTK_NO_WINDOW) != 0)
Evaluates to TRUE if the widget doesn't have an own GdkWindow.
| wid: | a GtkWidget. | 
#define GTK_WIDGET_REALIZED(wid) ((GTK_WIDGET_FLAGS (wid) & GTK_REALIZED) != 0)
Evaluates to TRUE if the widget is realized.
| wid: | a GtkWidget. | 
#define GTK_WIDGET_MAPPED(wid) ((GTK_WIDGET_FLAGS (wid) & GTK_MAPPED) != 0)
Evaluates to TRUE if the widget is mapped.
| wid: | a GtkWidget. | 
#define GTK_WIDGET_VISIBLE(wid) ((GTK_WIDGET_FLAGS (wid) & GTK_VISIBLE) != 0)
Evaluates to TRUE if the widget is visible.
| wid: | a GtkWidget. | 
#define GTK_WIDGET_DRAWABLE(wid) (GTK_WIDGET_VISIBLE (wid) && GTK_WIDGET_MAPPED (wid))
Evaluates to TRUE if the widget is mapped and visible.
| wid: | a GtkWidget. | 
#define GTK_WIDGET_SENSITIVE(wid) ((GTK_WIDGET_FLAGS (wid) & GTK_SENSITIVE) != 0)
Evaluates to TRUE if the GTK_SENSITIVE flag has be set on the widget.
| wid: | a GtkWidget. | 
#define GTK_WIDGET_PARENT_SENSITIVE(wid) ((GTK_WIDGET_FLAGS (wid) & GTK_PARENT_SENSITIVE) != 0)
Evaluates to TRUE if the GTK_PARENT_SENSITIVE flag has be set on the widget.
| wid: | a GtkWidget. | 
#define GTK_WIDGET_IS_SENSITIVE(wid)
Evaluates to TRUE if the widget is effectively sensitive.
| wid: | a GtkWidget. | 
#define GTK_WIDGET_CAN_FOCUS(wid) ((GTK_WIDGET_FLAGS (wid) & GTK_CAN_FOCUS) != 0)
Evaluates to TRUE if the widget is able to handle focus grabs.
| wid: | a GtkWidget. | 
#define GTK_WIDGET_HAS_FOCUS(wid) ((GTK_WIDGET_FLAGS (wid) & GTK_HAS_FOCUS) != 0)
Evaluates to TRUE if the widget has grabbed the focus and no other
widget has done so more recently.
| wid: | a GtkWidget. | 
#define GTK_WIDGET_CAN_DEFAULT(wid) ((GTK_WIDGET_FLAGS (wid) & GTK_CAN_DEFAULT) != 0)
Evaluates to TRUE if the widget is allowed to receive the default action 
via gtk_widget_grab_default(). 
| wid: | a GtkWidget. | 
#define GTK_WIDGET_RECEIVES_DEFAULT(wid) ((GTK_WIDGET_FLAGS (wid) & GTK_RECEIVES_DEFAULT) != 0)
Evaluates to TRUE if the widget when focused will receive the default action 
even if there is a different widget set as default.
| wid: | a GtkWidget. | 
#define GTK_WIDGET_HAS_DEFAULT(wid) ((GTK_WIDGET_FLAGS (wid) & GTK_HAS_DEFAULT) != 0)
Evaluates to TRUE if the widget currently is receiving the default action.
| wid: | a GtkWidget. | 
#define GTK_WIDGET_HAS_GRAB(wid) ((GTK_WIDGET_FLAGS (wid) & GTK_HAS_GRAB) != 0)
Evaluates to TRUE if the widget is in the grab_widgets stack, and will be 
the preferred one for receiving events other than ones of cosmetic value.
| wid: | a GtkWidget. | 
#define GTK_WIDGET_RC_STYLE(wid) ((GTK_WIDGET_FLAGS (wid) & GTK_RC_STYLE) != 0)
Evaluates to TRUE if the widget's style has been looked up through the rc
mechanism.
| wid: | a GtkWidget. | 
#define GTK_WIDGET_COMPOSITE_CHILD(wid) ((GTK_WIDGET_FLAGS (wid) & GTK_COMPOSITE_CHILD) != 0)
Evaluates to TRUE if the widget is a composite child of its parent.
| wid: | a GtkWidget. | 
#define GTK_WIDGET_APP_PAINTABLE(wid) ((GTK_WIDGET_FLAGS (wid) & GTK_APP_PAINTABLE) != 0)
Evaluates to TRUE if the GTK_APP_PAINTABLE flag has been set on the widget.
| wid: | a GtkWidget. | 
#define GTK_WIDGET_DOUBLE_BUFFERED(wid) ((GTK_WIDGET_FLAGS (wid) & GTK_DOUBLE_BUFFERED) != 0)
Evaluates to TRUE if the GTK_DOUBLE_BUFFERED flag has been set on the widget.
| wid: | a GtkWidget. | 
#define GTK_WIDGET_SET_FLAGS(wid,flag)	  G_STMT_START{ (GTK_WIDGET_FLAGS (wid) |= (flag)); }G_STMT_END
Turns on certain widget flags.
| wid: | a GtkWidget. | 
| flag: | the flags to set. | 
#define GTK_WIDGET_UNSET_FLAGS(wid,flag)  G_STMT_START{ (GTK_WIDGET_FLAGS (wid) &= ~(flag)); }G_STMT_END
Turns off certain widget flags.
| wid: | a GtkWidget. | 
| flag: | the flags to unset. | 
void (*GtkCallback) (GtkWidget *widget, gpointer data);
The type of the callback functions used for e.g. iterating over
the children of a container, see gtk_container_foreach(). 
| widget: | the widget to operate on | 
| data: | user-supplied data | 
typedef struct {
  gint width;
  gint height;
} GtkRequisition;
A GtkRequisition represents the desired size of a widget. See the section called “Size Requisition” for more information.
struct GtkAllocation {
  gint x;
  gint y;
  gint width;
  gint height;
};
A GtkAllocation of a widget represents region which has been allocated to the widget by its parent. It is a subregion of its parents allocation. See the section called “Size Allocation” for more information.
typedef struct {
  GdkAtom	selection;
  GdkAtom	target;
  GdkAtom	type;
  gint		format;
  guchar       *data;  
  gint		length;
  GdkDisplay   *display;
} GtkSelectionData;
typedef struct {
  gint x;
  gint y;
  gint width;
  gint height;
  guint x_set : 1;
  guint y_set : 1;
} GtkWidgetAuxInfo;
typedef struct {
  gint16     offset_x;
  gint16     offset_y;
  GdkBitmap *shape_mask;
} GtkWidgetShapeInfo;
typedef enum
{
  GTK_WIDGET_HELP_TOOLTIP,
  GTK_WIDGET_HELP_WHATS_THIS
} GtkWidgetHelpType;
GtkWidget* gtk_widget_new (GType type, const gchar *first_property_name, ...);
This is a convenience function for creating a widget and setting
its properties in one go. For example you might write:
gtk_widget_new (GTK_TYPE_LABEL, "label", "Hello World", "xalign",
0.0, NULL) to create a left-aligned label. Equivalent to
g_object_new(), but returns a widget so you don't have to
cast the object yourself.
| type: | type ID of the widget to create | 
| first_property_name: | name of first property to set | 
| ...: | value of first property, followed by more properties, NULL-terminated | 
| Returns : | a new GtkWidget of type widget_type | 
GtkWidget* gtk_widget_ref (GtkWidget *widget);
Adds a reference to a widget. This function is exactly the same
as calling g_object_ref(), and exists mostly for historical
reasons. It can still be convenient to avoid casting a widget
to a GObject, it saves a small amount of typing.
| widget: | a GtkWidget | 
| Returns : | the widget that was referenced | 
void gtk_widget_unref (GtkWidget *widget);
Inverse of gtk_widget_ref(). Equivalent to g_object_unref().
| widget: | a GtkWidget | 
void gtk_widget_destroy (GtkWidget *widget);
Destroys a widget. Equivalent to gtk_object_destroy(), except that
you don't have to cast the widget to GtkObject. When a widget is
destroyed, it will break any references it holds to other objects.
If the widget is inside a container, the widget will be removed
from the container. If the widget is a toplevel (derived from
GtkWindow), it will be removed from the list of toplevels, and the
reference GTK+ holds to it will be removed. Removing a
widget from its container or the list of toplevels results in the
widget being finalized, unless you've added additional references
to the widget with g_object_ref().
In most cases, only toplevel widgets (windows) require explicit destruction, because when you destroy a toplevel its children will be destroyed as well.
| widget: | a GtkWidget | 
void gtk_widget_destroyed (GtkWidget *widget, GtkWidget **widget_pointer);
This function sets *widget_pointer to NULL if widget_pointer !=
NULL.  It's intended to be used as a callback connected to the
"destroy" signal of a widget. You connect gtk_widget_destroyed()
as a signal handler, and pass the address of your widget variable
as user data. Then when the widget is destroyed, the variable will
be set to NULL. Useful for example to avoid multiple copies
of the same dialog.
| widget: | a GtkWidget | 
| widget_pointer: | address of a variable that contains widget | 
void gtk_widget_set (GtkWidget *widget, const gchar *first_property_name, ...);
gtk_widget_set is deprecated and should not be used in newly-written code.
Like g_object_set() - there's no reason to use this instead of
g_object_set().
| widget: | a GtkWidget | 
| first_property_name: | name of first property to set | 
| ...: | value of first property, followed by more properties, NULL-terminated | 
void gtk_widget_unparent (GtkWidget *widget);
This function is only for use in widget implementations. Should be called by implementations of the remove method on GtkContainer, to dissociate a child from the container.
| widget: | a GtkWidget | 
void gtk_widget_show (GtkWidget *widget);
Flags a widget to be displayed. Any widget that isn't shown will
not appear on the screen. If you want to show all the widgets in a
container, it's easier to call gtk_widget_show_all() on the
container, instead of individually showing the widgets.
Remember that you have to show the containers containing a widget, in addition to the widget itself, before it will appear onscreen.
When a toplevel container is shown, it is immediately realized and mapped; other shown widgets are realized and mapped when their toplevel container is realized and mapped.
| widget: | a GtkWidget | 
void gtk_widget_show_now (GtkWidget *widget);
Shows a widget. If the widget is an unmapped toplevel widget (i.e. a GtkWindow that has not yet been shown), enter the main loop and wait for the window to actually be mapped. Be careful; because the main loop is running, anything can happen during this function.
| widget: | a GtkWidget | 
void gtk_widget_hide (GtkWidget *widget);
Reverses the effects of gtk_widget_show(), causing the widget to be
hidden (invisible to the user).
| widget: | a GtkWidget | 
void gtk_widget_show_all (GtkWidget *widget);
Recursively shows a widget, and any child widgets (if the widget is a container).
| widget: | a GtkWidget | 
void gtk_widget_hide_all (GtkWidget *widget);
Recursively hides a widget and any child widgets.
| widget: | a GtkWidget | 
void gtk_widget_map (GtkWidget *widget);
This function is only for use in widget implementations. Causes a widget to be mapped if it isn't already.
| widget: | a GtkWidget | 
void gtk_widget_unmap (GtkWidget *widget);
This function is only for use in widget implementations. Causes a widget to be unmapped if it's currently mapped.
| widget: | a GtkWidget | 
void gtk_widget_realize (GtkWidget *widget);
Creates the GDK (windowing system) resources associated with a
widget.  For example, widget->window will be created when a widget
is realized.  Normally realization happens implicitly; if you show
a widget and all its parent containers, then the widget will be
realized and mapped automatically.
Realizing a widget requires all
the widget's parent widgets to be realized; calling
gtk_widget_realize() realizes the widget's parents in addition to
widget itself. If a widget is not yet inside a toplevel window
when you realize it, bad things will happen.
This function is primarily used in widget implementations, and
isn't very useful otherwise. Many times when you think you might
need it, a better approach is to connect to a signal that will be
called after the widget is realized automatically, such as
"expose_event". Or simply g_signal_connect_after() to the
"realize" signal.
| widget: | a GtkWidget | 
void gtk_widget_unrealize (GtkWidget *widget);
This function is only useful in widget implementations.
Causes a widget to be unrealized (frees all GDK resources
associated with the widget, such as widget->window).
| widget: | a GtkWidget | 
void gtk_widget_queue_draw (GtkWidget *widget);
Equivalent to calling gtk_widget_queue_draw_area() for the
entire area of a widget.
| widget: | a GtkWidget | 
void gtk_widget_queue_resize (GtkWidget *widget);
This function is only for use in widget implementations. Flags a widget to have its size renegotiated; should be called when a widget for some reason has a new size request. For example, when you change the text in a GtkLabel, GtkLabel queues a resize to ensure there's enough space for the new text.
| widget: | a GtkWidget | 
void        gtk_widget_queue_resize_no_redraw
                                            (GtkWidget *widget);
This function works like gtk_widget_queue_resize(), except that the
widget is not invalidated.
| widget: | a GtkWidget | 
Since 2.4
void gtk_widget_draw (GtkWidget *widget, GdkRectangle *area);
gtk_widget_draw is deprecated and should not be used in newly-written code.
In GTK+ 1.2, this function would immediately render the
region area of a widget, by invoking the virtual draw method of a
widget. In GTK+ 2.0, the draw method is gone, and instead
gtk_widget_draw() simply invalidates the specified region of the
widget, then updates the invalid region of the widget immediately.
Usually you don't want to update the region immediately for
performance reasons, so in general gtk_widget_queue_draw_area() is
a better choice if you want to draw a region of a widget.
| widget: | a GtkWidget | 
| area: | area to draw | 
void gtk_widget_size_request (GtkWidget *widget, GtkRequisition *requisition);
This function is typically used when implementing a GtkContainer
subclass.  Obtains the preferred size of a widget. The container
uses this information to arrange its child widgets and decide what
size allocations to give them with gtk_widget_size_allocate().
You can also call this function from an application, with some caveats. Most notably, getting a size request requires the widget to be associated with a screen, because font information may be needed. Multihead-aware applications should keep this in mind.
Also remember that the size request is not necessarily the size a widget will actually be allocated.
See also gtk_widget_get_child_requisition().
| widget: | a GtkWidget | 
| requisition: | a GtkRequisition to be filled in | 
void        gtk_widget_get_child_requisition
                                            (GtkWidget *widget,
                                             GtkRequisition *requisition);
This function is only for use in widget implementations. Obtains
widget->requisition, unless someone has forced a particular
geometry on the widget (e.g. with gtk_widget_set_usize()), in which
case it returns that geometry instead of the widget's requisition.
This function differs from gtk_widget_size_request() in that
it retrieves the last size request value from widget->requisition,
while gtk_widget_size_request() actually calls the "size_request" method
on widget to compute the size request and fill in widget->requisition,
and only then returns widget->requisition.
Because this function does not call the "size_request" method, it
can only be used when you know that widget->requisition is
up-to-date, that is, gtk_widget_size_request() has been called
since the last time a resize was queued. In general, only container
implementations have this information; applications should use
gtk_widget_size_request().
| widget: | a GtkWidget | 
| requisition: | a GtkRequisition to be filled in | 
void gtk_widget_size_allocate (GtkWidget *widget, GtkAllocation *allocation);
This function is only used by GtkContainer subclasses, to assign a size and position to their child widgets.
| widget: | a GtkWidget | 
| allocation: | position and size to be allocated to widget | 
void gtk_widget_add_accelerator (GtkWidget *widget, const gchar *accel_signal, GtkAccelGroup *accel_group, guint accel_key, GdkModifierType accel_mods, GtkAccelFlags accel_flags);
Installs an accelerator for this widget in accel_group that causes
accel_signal to be emitted if the accelerator is activated.
The accel_group needs to be added to the widget's toplevel via
gtk_window_add_accel_group(), and the signal must be of type G_RUN_ACTION.
Accelerators added through this function are not user changeable during
runtime. If you want to support accelerators that can be changed by the
user, use gtk_accel_map_add_entry() and gtk_widget_set_accel_path() or
gtk_menu_item_set_accel_path() instead.
| widget: | widget to install an accelerator on | 
| accel_signal: | widget signal to emit on accelerator activation | 
| accel_group: | accel group for this widget, added to its toplevel | 
| accel_key: | GDK keyval of the accelerator | 
| accel_mods: | modifier key combination of the accelerator | 
| accel_flags: | flag accelerators, e.g. GTK_ACCEL_VISIBLE | 
gboolean gtk_widget_remove_accelerator (GtkWidget *widget, GtkAccelGroup *accel_group, guint accel_key, GdkModifierType accel_mods);
Removes an accelerator from widget, previously installed with
gtk_widget_add_accelerator().
| widget: | widget to install an accelerator on | 
| accel_group: | accel group for this widget | 
| accel_key: | GDK keyval of the accelerator | 
| accel_mods: | modifier key combination of the accelerator | 
| Returns : | whether an accelerator was installed and could be removed | 
void gtk_widget_set_accel_path (GtkWidget *widget, const gchar *accel_path, GtkAccelGroup *accel_group);
Given an accelerator group, accel_group, and an accelerator path,
accel_path, sets up an accelerator in accel_group so whenever the
key binding that is defined for accel_path is pressed, widget
will be activated.  This removes any accelerators (for any
accelerator group) installed by previous calls to
gtk_widget_set_accel_path(). Associating accelerators with
paths allows them to be modified by the user and the modifications
to be saved for future use. (See gtk_accel_map_save().)
This function is a low level function that would most likely be used by a menu creation system like GtkItemFactory. If you use GtkItemFactory, setting up accelerator paths will be done automatically.
Even when you you aren't using GtkItemFactory, if you only want to
set up accelerators on menu items gtk_menu_item_set_accel_path()
provides a somewhat more convenient interface.
| widget: | a GtkWidget | 
| accel_path: | path used to look up the accelerator | 
| accel_group: | a GtkAccelGroup. | 
GList* gtk_widget_list_accel_closures (GtkWidget *widget);
Lists the closures used by widget for accelerator group connections
with gtk_accel_group_connect_by_path() or gtk_accel_group_connect().
The closures can be used to monitor accelerator changes on widget,
by connecting to the ::accel_changed signal of the GtkAccelGroup of a 
closure which can be found out with gtk_accel_group_from_accel_closure().
| widget: | widget to list accelerator closures for | 
| Returns : | a newly allocated GList of closures | 
gboolean gtk_widget_can_activate_accel (GtkWidget *widget, guint signal_id);
Determines whether an accelerator that activates the signal
identified by signal_id can currently be activated.
This is done by emitting the GtkWidget::can-activate-accel
signal on widget; if the signal isn't overridden by a
handler or in a derived widget, then the default check is
that the widget must be sensitive, and the widget and all
its ancestors mapped.
| widget: | a GtkWidget | 
| signal_id: | the ID of a signal installed on widget | 
| Returns : | TRUEif the accelerator can be activated. | 
Since 2.4
gboolean gtk_widget_event (GtkWidget *widget, GdkEvent *event);
Rarely-used function. This function is used to emit
the event signals on a widget (those signals should never
be emitted without using this function to do so).
If you want to synthesize an event though, don't use this function;
instead, use gtk_main_do_event() so the event will behave as if
it were in the event queue. Don't synthesize expose events; instead,
use gdk_window_invalidate_rect() to invalidate a region of the
window.
gboolean gtk_widget_activate (GtkWidget *widget);
For widgets that can be "activated" (buttons, menu items, etc.)
this function activates them. Activation is what happens when you
press Enter on a widget during key navigation. If widget isn't 
activatable, the function returns FALSE.
| widget: | a GtkWidget that's activatable | 
| Returns : | TRUEif the widget was activatable | 
void gtk_widget_reparent (GtkWidget *widget, GtkWidget *new_parent);
Moves a widget from one GtkContainer to another, handling reference count issues to avoid destroying the widget.
| widget: | a GtkWidget | 
| new_parent: | a GtkContainer to move the widget into | 
gboolean gtk_widget_intersect (GtkWidget *widget, GdkRectangle *area, GdkRectangle *intersection);
Computes the intersection of a widget's area and area, storing
the intersection in intersection, and returns TRUE if there was
an intersection.  intersection may be NULL if you're only
interested in whether there was an intersection.
| widget: | a GtkWidget | 
| area: | a rectangle | 
| intersection: | rectangle to store intersection of widgetandarea | 
| Returns : | TRUEif there was an intersection | 
gboolean gtk_widget_is_focus (GtkWidget *widget);
Determines if the widget is the focus widget within its
toplevel. (This does not mean that the HAS_FOCUS flag is
necessarily set; HAS_FOCUS will only be set if the
toplevel widget additionally has the global input focus.)
| widget: | a GtkWidget | 
| Returns : | TRUEif the widget is the focus widget. | 
void gtk_widget_grab_focus (GtkWidget *widget);
Causes widget to have the keyboard focus for the GtkWindow it's
inside. widget must be a focusable widget, such as a GtkEntry;
something like GtkFrame won't work. (More precisely, it must have the
GTK_CAN_FOCUS flag set.)
| widget: | a GtkWidget | 
void gtk_widget_grab_default (GtkWidget *widget);
Causes widget to become the default widget. widget must have the
GTK_CAN_DEFAULT flag set; typically you have to set this flag
yourself by calling GTK_WIDGET_SET_FLAGS (.  The default widget is activated when the user
presses Enter in a window.  Default widgets must be activatable,
that is, widget,
GTK_CAN_DEFAULT)gtk_widget_activate() should affect them.
| widget: | a GtkWidget | 
void gtk_widget_set_name (GtkWidget *widget, const gchar *name);
Widgets can be named, which allows you to refer to them from a gtkrc file. You can apply a style to widgets with a particular name in the gtkrc file. See the documentation for gtkrc files (on the same page as the docs for GtkRcStyle).
Note that widget names are separated by periods in paths (see 
gtk_widget_path()), so names with embedded periods may cause confusion.
| widget: | a GtkWidget | 
| name: | name for the widget | 
const gchar* gtk_widget_get_name (GtkWidget *widget);
Retrieves the name of a widget. See gtk_widget_set_name() for the
significance of widget names.
| widget: | a GtkWidget | 
| Returns : | name of the widget. This string is owned by GTK+ and should not be modified or freed | 
void gtk_widget_set_state (GtkWidget *widget, GtkStateType state);
This function is for use in widget implementations. Sets the state
of a widget (insensitive, prelighted, etc.) Usually you should set
the state using wrapper functions such as gtk_widget_set_sensitive().
| widget: | a GtkWidget | 
| state: | new state for widget | 
void gtk_widget_set_sensitive (GtkWidget *widget, gboolean sensitive);
Sets the sensitivity of a widget. A widget is sensitive if the user can interact with it. Insensitive widgets are "grayed out" and the user can't interact with them. Insensitive widgets are known as "inactive", "disabled", or "ghosted" in some other toolkits.
| widget: | a GtkWidget | 
| sensitive: | TRUEto make the widget sensitive | 
void gtk_widget_set_parent (GtkWidget *widget, GtkWidget *parent);
This function is useful only when implementing subclasses of GtkContainer.
Sets the container as the parent of widget, and takes care of
some details such as updating the state and style of the child
to reflect its new location. The opposite function is
gtk_widget_unparent().
| widget: | a GtkWidget | 
| parent: | parent container | 
void gtk_widget_set_parent_window (GtkWidget *widget, GdkWindow *parent_window);
Sets a non default parent window for widget.
| widget: | a GtkWidget. | 
| parent_window: | the new parent window. | 
GdkWindow* gtk_widget_get_parent_window (GtkWidget *widget);
Gets widget's parent window.
| widget: | a GtkWidget. | 
| Returns : | the parent window of widget. | 
void gtk_widget_set_uposition (GtkWidget *widget, gint x, gint y);
gtk_widget_set_uposition is deprecated and should not be used in newly-written code.
Sets the position of a widget. The funny "u" in the name comes from the "user position" hint specified by the X Window System, and exists for legacy reasons. This function doesn't work if a widget is inside a container; it's only really useful on GtkWindow.
Don't use this function to center dialogs over the main application
window; most window managers will do the centering on your behalf
if you call gtk_window_set_transient_for(), and it's really not
possible to get the centering to work correctly in all cases from
application code. But if you insist, use gtk_window_set_position()
to set GTK_WIN_POS_CENTER_ON_PARENT, don't do the centering
manually.
Note that although x and y can be individually unset, the position
is not honoured unless both x and y are set.
| widget: | a GtkWidget | 
| x: | x position; -1 to unset x; -2 to leave x unchanged | 
| y: | y position; -1 to unset y; -2 to leave y unchanged | 
void gtk_widget_set_usize (GtkWidget *widget, gint width, gint height);
gtk_widget_set_usize is deprecated and should not be used in newly-written code.
Sets the minimum size of a widget; that is, the widget's size
request will be width by height. You can use this function to
force a widget to be either larger or smaller than it is. The
strange "usize" name dates from the early days of GTK+, and derives
from X Window System terminology. In many cases,
gtk_window_set_default_size() is a better choice for toplevel
windows than this function; setting the default size will still
allow users to shrink the window. Setting the usize will force them
to leave the window at least as large as the usize. When dealing
with window sizes, gtk_window_set_geometry_hints() can be a useful
function as well.
Note the inherent danger of setting any fixed size - themes, translations into other languages, different fonts, and user action can all change the appropriate size for a given widget. So, it's basically impossible to hardcode a size that will always be correct.
Deprecated: Use gtk_widget_set_size_request() instead.
| widget: | a GtkWidget | 
| width: | minimum width, or -1 to unset | 
| height: | minimum height, or -1 to unset | 
void gtk_widget_set_events (GtkWidget *widget, gint events);
Sets the event mask (see GdkEventMask) for a widget. The event
mask determines which events a widget will receive. Keep in mind
that different widgets have different default event masks, and by
changing the event mask you may disrupt a widget's functionality,
so be careful. This function must be called while a widget is
unrealized. Consider gtk_widget_add_events() for widgets that are
already realized, or if you want to preserve the existing event
mask. This function can't be used with GTK_NO_WINDOW widgets;
to get events on those widgets, place them inside a GtkEventBox
and receive events on the event box.
| widget: | a GtkWidget | 
| events: | event mask | 
void gtk_widget_add_events (GtkWidget *widget, gint events);
Adds the events in the bitfield events to the event mask for
widget. See gtk_widget_set_events() for details.
| widget: | a GtkWidget | 
| events: | an event mask, see GdkEventMask | 
void gtk_widget_set_extension_events (GtkWidget *widget, GdkExtensionMode mode);
Sets the extension events mask to mode. See GdkExtensionMode
and gdk_input_set_extension_events().
| widget: | a GtkWidget | 
| mode: | bitfield of extension events to receive | 
GdkExtensionMode gtk_widget_get_extension_events (GtkWidget *widget);
Retrieves the extension events the widget will receive; see
gdk_input_set_extension_events().
| widget: | a GtkWidget | 
| Returns : | extension events for widget | 
GtkWidget* gtk_widget_get_toplevel (GtkWidget *widget);
This function returns the topmost widget in the container hierarchy
widget is a part of. If widget has no parent widgets, it will be
returned as the topmost widget. No reference will be added to the
returned widget; it should not be unreferenced.
Note the difference in behavior vs. gtk_widget_get_ancestor();
gtk_widget_get_ancestor (widget, GTK_TYPE_WINDOW) 
would return
NULL if widget wasn't inside a toplevel window, and if the
window was inside a GtkWindow-derived widget which was in turn
inside the toplevel GtkWindow. While the second case may
seem unlikely, it actually happens when a GtkPlug is embedded
inside a GtkSocket within the same application.
To reliably find the toplevel GtkWindow, use
gtk_widget_get_toplevel() and check if the TOPLEVEL flags
is set on the result.
 GtkWidget *toplevel = gtk_widget_get_toplevel (widget);
 if (GTK_WIDGET_TOPLEVEL (toplevel))
   {
     [ Perform action on toplevel. ]
   }
| widget: | a GtkWidget | 
| Returns : | the topmost ancestor of widget, orwidgetitself if there's no ancestor. | 
GtkWidget* gtk_widget_get_ancestor (GtkWidget *widget, GType widget_type);
Gets the first ancestor of widget with type widget_type. For example,
gtk_widget_get_ancestor (widget, GTK_TYPE_BOX) gets the 
first GtkBox that's
an ancestor of widget. No reference will be added to the returned widget;
it should not be unreferenced. See note about checking for a toplevel
GtkWindow in the docs for gtk_widget_get_toplevel().
Note that unlike gtk_widget_is_ancestor(), gtk_widget_get_ancestor() 
considers widget to be an ancestor of itself.
| widget: | a GtkWidget | 
| widget_type: | ancestor type | 
| Returns : | the ancestor widget, or NULLif not found | 
GdkColormap* gtk_widget_get_colormap (GtkWidget *widget);
Gets the colormap that will be used to render widget. No reference will
be added to the returned colormap; it should not be unreferenced.
| widget: | a GtkWidget | 
| Returns : | the colormap used by widget | 
void gtk_widget_set_colormap (GtkWidget *widget, GdkColormap *colormap);
Sets the colormap for the widget to the given value. Widget must not
have been previously realized. This probably should only be used
from an init()
| widget: | a GtkWidget | 
| colormap: | a colormap | 
GdkVisual* gtk_widget_get_visual (GtkWidget *widget);
Gets the visual that will be used to render widget.
| widget: | a GtkWidget | 
| Returns : | the visual for widget | 
gint gtk_widget_get_events (GtkWidget *widget);
Returns the event mask for the widget (a bitfield containing flags from the GdkEventMask enumeration). These are the events that the widget will receive.
| widget: | a GtkWidget | 
| Returns : | event mask for widget | 
void gtk_widget_get_pointer (GtkWidget *widget, gint *x, gint *y);
Obtains the location of the mouse pointer in widget coordinates.
Widget coordinates are a bit odd; for historical reasons, they are
defined as widget->window coordinates for widgets that are not
GTK_NO_WINDOW widgets, and are relative to widget->allocation.x,
widget->allocation.y for widgets that are GTK_NO_WINDOW widgets.
| widget: | a GtkWidget | 
| x: | return location for the X coordinate, or NULL | 
| y: | return location for the Y coordinate, or NULL | 
gboolean gtk_widget_is_ancestor (GtkWidget *widget, GtkWidget *ancestor);
Determines whether widget is somewhere inside ancestor, possibly with
intermediate containers.
gboolean gtk_widget_translate_coordinates (GtkWidget *src_widget, GtkWidget *dest_widget, gint src_x, gint src_y, gint *dest_x, gint *dest_y);
Translate coordinates relative to src_widget's allocation to coordinates
relative to dest_widget's allocations. In order to perform this
operation, both widgets must be realized, and must share a common
toplevel.
| src_widget: | a GtkWidget | 
| dest_widget: | a GtkWidget | 
| src_x: | X position relative to src_widget | 
| src_y: | Y position relative to src_widget | 
| dest_x: | location to store X position relative to dest_widget | 
| dest_y: | location to store Y position relative to dest_widget | 
| Returns : | FALSEif either widget was not realized, or there
  was no common ancestor. In this case, nothing is stored in
  *dest_xand *dest_y. OtherwiseTRUE. | 
gboolean gtk_widget_hide_on_delete (GtkWidget *widget);
Utility function; intended to be connected to the "delete_event"
signal on a GtkWindow. The function calls gtk_widget_hide() on its
argument, then returns TRUE. If connected to "delete_event", the
result is that clicking the close button for a window (on the
window frame, top right corner usually) will hide but not destroy
the window. By default, GTK+ destroys windows when "delete_event"
is received.
| widget: | a GtkWidget | 
| Returns : | TRUE | 
void gtk_widget_set_style (GtkWidget *widget, GtkStyle *style);
Sets the GtkStyle for a widget (widget->style). You probably don't
want to use this function; it interacts badly with themes, because
themes work by replacing the GtkStyle. Instead, use
gtk_widget_modify_style().
| widget: | a GtkWidget | 
| style: | a GtkStyle, or NULLto remove the effect of a previousgtk_widget_set_style()and go back to the default style | 
#define gtk_widget_set_rc_style(widget) (gtk_widget_set_style (widget, NULL))
gtk_widget_set_rc_style is deprecated and should not be used in newly-written code.
Equivalent to gtk_widget_set_style (widget, NULL).
| widget: | a GtkWidget. | 
void gtk_widget_ensure_style (GtkWidget *widget);
Ensures that widget has a style (widget->style). Not a very useful
function; most of the time, if you want the style, the widget is
realized, and realized widgets are guaranteed to have a style
already.
| widget: | a GtkWidget | 
GtkStyle* gtk_widget_get_style (GtkWidget *widget);
Simply an accessor function that returns widget->style.
#define gtk_widget_restore_default_style(widget) (gtk_widget_set_style (widget, NULL))
gtk_widget_restore_default_style is deprecated and should not be used in newly-written code.
Equivalent to gtk_widget_set_style (widget, NULL).
| widget: | a GtkWidget. | 
void gtk_widget_reset_rc_styles (GtkWidget *widget);
Reset the styles of widget and all descendents, so when 
they are looked up again, they get the correct values 
for the currently loaded RC file settings. 
This function is not useful for applications.
| widget: | a GtkWidget. | 
void gtk_widget_push_colormap (GdkColormap *cmap);
Pushes cmap onto a global stack of colormaps; the topmost
colormap on the stack will be used to create all widgets.
Remove cmap with gtk_widget_pop_colormap(). There's little
reason to use this function.
| cmap: | a GdkColormap | 
void gtk_widget_pop_colormap (void);
Removes a colormap pushed with gtk_widget_push_colormap().
void gtk_widget_set_default_colormap (GdkColormap *colormap);
Sets the default colormap to use when creating widgets.
gtk_widget_push_colormap() is a better function to use if
you only want to affect a few widgets, rather than all widgets.
| colormap: | a GdkColormap | 
GtkStyle* gtk_widget_get_default_style (void);
Returns the default style used by all widgets initially.
| Returns : | the default style. This GtkStyle object is owned by GTK+ and should not be modified or freed. | 
GdkColormap* gtk_widget_get_default_colormap (void);
Obtains the default colormap used to create widgets.
| Returns : | default widget colormap | 
GdkVisual* gtk_widget_get_default_visual (void);
Obtains the visual of the default colormap. Not really useful;
used to be useful before gdk_colormap_get_visual() existed.
| Returns : | visual of the default colormap | 
void gtk_widget_set_direction (GtkWidget *widget, GtkTextDirection dir);
Sets the reading direction on a particular widget. This direction controls the primary direction for widgets containing text, and also the direction in which the children of a container are packed. The ability to set the direction is present in order so that correct localization into languages with right-to-left reading directions can be done. Generally, applications will let the default reading direction present, except for containers where the containers are arranged in an order that is explicitely visual rather than logical (such as buttons for text justification).
If the direction is set to GTK_TEXT_DIR_NONE, then the value
set by gtk_widget_set_default_direction() will be used.
| widget: | a GtkWidget | 
| dir: | the new direction | 
typedef enum
{
  GTK_TEXT_DIR_NONE,
  GTK_TEXT_DIR_LTR,
  GTK_TEXT_DIR_RTL
} GtkTextDirection;
GtkTextDirection gtk_widget_get_direction (GtkWidget *widget);
Gets the reading direction for a particular widget. See
gtk_widget_set_direction().
| widget: | a GtkWidget | 
| Returns : | the reading direction for the widget. | 
void        gtk_widget_set_default_direction
                                            (GtkTextDirection dir);
Sets the default reading direction for widgets where the
direction has not been explicitly set by gtk_widget_set_direction().
| dir: | the new default direction. This cannot be GTK_TEXT_DIR_NONE. | 
GtkTextDirection gtk_widget_get_default_direction (void);
Obtains the current default reading direction. See
gtk_widget_set_default_direction().
| Returns : | the current default direction. | 
void gtk_widget_shape_combine_mask (GtkWidget *widget, GdkBitmap *shape_mask, gint offset_x, gint offset_y);
Sets a shape for this widget's GDK window. This allows for
transparent windows etc., see gdk_window_shape_combine_mask()
for more information.
| widget: | a GtkWidget. | 
| shape_mask: | shape to be added, or NULLto remove an existing shape. | 
| offset_x: | X position of shape mask with respect to window. | 
| offset_y: | Y position of shape mask with respect to window. | 
void gtk_widget_path (GtkWidget *widget, guint *path_length, gchar **path, gchar **path_reversed);
Obtains the full path to widget. The path is simply the name of a
widget and all its parents in the container hierarchy, separated by
periods. The name of a widget comes from
gtk_widget_get_name(). Paths are used to apply styles to a widget
in gtkrc configuration files.  Widget names are the type of the
widget by default (e.g. "GtkButton") or can be set to an
application-specific value with gtk_widget_set_name().  By setting
the name of a widget, you allow users or theme authors to apply
styles to that specific widget in their gtkrc
file. path_reversed_p fills in the path in reverse order,
i.e. starting with widget's name instead of starting with the name
of widget's outermost ancestor.
| widget: | a GtkWidget | 
| path_length: | location to store length of the path, or NULL | 
| path: | location to store allocated path string, or NULL | 
| path_reversed: | location to store allocated reverse path string, or NULL | 
void gtk_widget_class_path (GtkWidget *widget, guint *path_length, gchar **path, gchar **path_reversed);
Same as gtk_widget_path(), but always uses the name of a widget's type,
never uses a custom name set with gtk_widget_set_name().
| widget: | a GtkWidget | 
| path_length: | location to store the length of the class path, or NULL | 
| path: | location to store the class path as an allocated string, or NULL | 
| path_reversed: | location to store the reverse class path as an allocated string, or NULL | 
gchar* gtk_widget_get_composite_name (GtkWidget *widget);
Obtains the composite name of a widget.
| widget: | a GtkWidget. | 
| Returns : | the composite name of widget, orNULLifwidgetis not
  a composite child. The string should not be freed when it is no 
  longer needed. | 
void gtk_widget_modify_style (GtkWidget *widget, GtkRcStyle *style);
Modifies style values on the widget. Modifications made using this
technique take precedence over style values set via an RC file,
however, they will be overriden if a style is explicitely set on
the widget using gtk_widget_set_style(). The GtkRcStyle structure
is designed so each field can either be set or unset, so it is
possible, using this function, to modify some style values and
leave the others unchanged.
Note that modifications made with this function are not cumulative
with previous calls to gtk_widget_modify_style() or with such
functions as gtk_widget_modify_fg(). If you wish to retain
previous values, you must first call gtk_widget_get_modifier_style(),
make your modifications to the returned style, then call
gtk_widget_modify_style() with that style. On the other hand,
if you first call gtk_widget_modify_style(), subsequent calls
to such functions gtk_widget_modify_fg() will have a cumulative
effect with the initial modifications.
| widget: | a GtkWidget | 
| style: | the GtkRcStyle holding the style modifications | 
GtkRcStyle* gtk_widget_get_modifier_style (GtkWidget *widget);
Returns the current modifier style for the widget. (As set by
gtk_widget_modify_style().) If no style has previously set, a new
GtkRcStyle will be created with all values unset, and set as the
modifier style for the widget. If you make changes to this rc
style, you must call gtk_widget_modify_style(), passing in the
returned rc style, to make sure that your changes take effect.
Caution: passing the style back to gtk_widget_modify_style() will
normally end up destroying it, because gtk_widget_modify_style() copies
the passed-in style and sets the copy as the new modifier style,
thus dropping any reference to the old modifier style. Add a reference
to the modifier style if you want to keep it alive.
| widget: | a GtkWidget | 
| Returns : | the modifier style for the widget. This rc style is
  owned by the widget. If you want to keep a pointer to value this
  around, you must add a refcount using gtk_rc_style_ref(). | 
void gtk_widget_modify_fg (GtkWidget *widget, GtkStateType state, const GdkColor *color);
Sets the foreground color for a widget in a particular state.  All
other style values are left untouched. See also
gtk_widget_modify_style().
| widget: | a GtkWidget. | 
| state: | the state for which to set the foreground color. | 
| color: | the color to assign (does not need to be allocated),
        or NULLto undo the effect of previous calls to
        ofgtk_widget_modify_fg(). | 
void gtk_widget_modify_bg (GtkWidget *widget, GtkStateType state, const GdkColor *color);
Sets the background color for a widget in a particular state.  All
other style values are left untouched. See also
gtk_widget_modify_style().
| widget: | a GtkWidget. | 
| state: | the state for which to set the background color. | 
| color: | the color to assign (does not need to be allocated),
        or NULLto undo the effect of previous calls to
        ofgtk_widget_modify_bg(). | 
void gtk_widget_modify_text (GtkWidget *widget, GtkStateType state, const GdkColor *color);
Sets the text color for a widget in a particular state.  All other
style values are left untouched. The text color is the foreground
color used along with the base color (see gtk_widget_modify_base())
for widgets such as GtkEntry and GtkTextView. See also
gtk_widget_modify_style().
| widget: | a GtkWidget. | 
| state: | the state for which to set the text color. | 
| color: | the color to assign (does not need to be allocated),
        or NULLto undo the effect of previous calls to
        ofgtk_widget_modify_text(). | 
void gtk_widget_modify_base (GtkWidget *widget, GtkStateType state, const GdkColor *color);
Sets the base color for a widget in a particular state.
All other style values are left untouched. The base color
is the background color used along with the text color
(see gtk_widget_modify_text()) for widgets such as GtkEntry
and GtkTextView. See also gtk_widget_modify_style().
| widget: | a GtkWidget. | 
| state: | the state for which to set the base color. | 
| color: | the color to assign (does not need to be allocated),
        or NULLto undo the effect of previous calls to
        ofgtk_widget_modify_base(). | 
void gtk_widget_modify_font (GtkWidget *widget, PangoFontDescription *font_desc);
Sets the font to use for a widget.  All other style values are left
untouched. See also gtk_widget_modify_style().
| widget: | a GtkWidget | 
| font_desc: | the font description to use, or NULLto undo
  the effect of previous calls togtk_widget_modify_font(). | 
PangoContext* gtk_widget_create_pango_context (GtkWidget *widget);
Creates a new PangoContext with the appropriate colormap,
font description, and base direction for drawing text for
this widget. See also gtk_widget_get_pango_context().
| widget: | a GtkWidget | 
| Returns : | the new PangoContext | 
PangoContext* gtk_widget_get_pango_context (GtkWidget *widget);
Gets a PangoContext with the appropriate colormap, font description
and base direction for this widget. Unlike the context returned
by gtk_widget_create_pango_context(), this context is owned by
the widget (it can be used until the screen for the widget changes
or the widget is removed from its toplevel), and will be updated to
match any changes to the widget's attributes.
If you create and keep a PangoLayout using this context, you must
deal with changes to the context by calling pango_layout_context_changed()
on the layout in response to the ::style-set and ::direction-changed signals
for the widget.
| widget: | a GtkWidget | 
| Returns : | the PangoContext for the widget. | 
PangoLayout* gtk_widget_create_pango_layout (GtkWidget *widget, const gchar *text);
Creates a new PangoLayout with the appropriate colormap, font description, and base direction for drawing text for this widget.
If you keep a PangoLayout created in this way around, in order
notify the layout of changes to the base direction or font of this
widget, you must call pango_layout_context_changed() in response to
the ::style-set and ::direction-changed signals for the widget.
| widget: | a GtkWidget | 
| text: | text to set on the layout (can be NULL) | 
| Returns : | the new PangoLayout | 
GdkPixbuf* gtk_widget_render_icon (GtkWidget *widget, const gchar *stock_id, GtkIconSize size, const gchar *detail);
A convenience function that uses the theme engine and RC file
settings for widget to look up stock_id and render it to
a pixbuf. stock_id should be a stock icon ID such as
GTK_STOCK_OPEN or GTK_STOCK_OK. size should be a size
such as GTK_ICON_SIZE_MENU. detail should be a string that
identifies the widget or code doing the rendering, so that
theme engines can special-case rendering for that widget or code.
The pixels in the returned GdkPixbuf are shared with the rest of
the application and should not be modified. The pixbuf should be freed
after use with g_object_unref().
| widget: | a GtkWidget | 
| stock_id: | a stock ID | 
| size: | a stock size. A size of (GtkIconSize)-1 means render at the size of the source and don't scale (if there are multiple source sizes, GTK+ picks one of the available sizes). | 
| detail: | render detail to pass to theme engine | 
| Returns : | a new pixbuf, or NULLif the stock ID wasn't known | 
void gtk_widget_pop_composite_child (void);
Cancels the effect of a previous call to gtk_widget_push_composite_child().
void gtk_widget_push_composite_child (void);
Makes all newly-created widgets as composite children until
the corresponding gtk_widget_pop_composite_child() call.
A composite child is a child that's an implementation detail of the
container it's inside and should not be visible to people using the
container. Composite children aren't treated differently by GTK (but
see gtk_container_foreach() vs. gtk_container_forall()), but e.g. GUI 
builders might want to treat them in a different way.
Here is a simple example:
  gtk_widget_push_composite_child ();
  scrolled_window->hscrollbar = gtk_hscrollbar_new (hadjustment);
  gtk_widget_set_composite_name (scrolled_window->hscrollbar, "hscrollbar");
  gtk_widget_pop_composite_child ();
  gtk_widget_set_parent (scrolled_window->hscrollbar, 
                         GTK_WIDGET (scrolled_window));
  g_object_ref (scrolled_window->hscrollbar);
void gtk_widget_queue_clear (GtkWidget *widget);
gtk_widget_queue_clear is deprecated and should not be used in newly-written code.
This function does the same as gtk_widget_queue_draw().
Deprecated: Use gtk_widget_queue_draw() instead.
| widget: | a GtkWidget | 
void gtk_widget_queue_clear_area (GtkWidget *widget, gint x, gint y, gint width, gint height);
gtk_widget_queue_clear_area is deprecated and should not be used in newly-written code.
This function is no longer different from
gtk_widget_queue_draw_area(), though it once was. Now it just calls
gtk_widget_queue_draw_area(). Originally
gtk_widget_queue_clear_area() would force a redraw of the
background for GTK_NO_WINDOW widgets, and
gtk_widget_queue_draw_area() would not. Now both functions ensure
the background will be redrawn.
Deprecated: Use gtk_widget_queue_draw_area() instead.
| widget: | a GtkWidget | 
| x: | x coordinate of upper-left corner of rectangle to redraw | 
| y: | y coordinate of upper-left corner of rectangle to redraw | 
| width: | width of region to draw | 
| height: | height of region to draw | 
void gtk_widget_queue_draw_area (GtkWidget *widget, gint x, gint y, gint width, gint height);
Invalidates the rectangular area of widget defined by x, y,
width and height by calling gdk_window_invalidate_rect() on the
widget's window and all its child windows.  Once the main loop
becomes idle (after the current batch of events has been processed,
roughly), the window will receive expose events for the union of
all regions that have been invalidated.
Normally you would only use this function in widget
implementations. You might also use it, or
gdk_window_invalidate_rect() directly, to schedule a redraw of a
GtkDrawingArea or some portion thereof.
Frequently you can just call gdk_window_invalidate_rect() or
gdk_window_invalidate_region() instead of this function. Those
functions will invalidate only a single window, instead of the
widget and all its children.
The advantage of adding to the invalidated region compared to simply drawing immediately is efficiency; using an invalid region ensures that you only have to redraw one time.
| widget: | a GtkWidget | 
| x: | x coordinate of upper-left corner of rectangle to redraw | 
| y: | y coordinate of upper-left corner of rectangle to redraw | 
| width: | width of region to draw | 
| height: | height of region to draw | 
void gtk_widget_reset_shapes (GtkWidget *widget);
Recursively resets the shape on this widget and its descendants.
| widget: | a GtkWidget. | 
void gtk_widget_set_app_paintable (GtkWidget *widget, gboolean app_paintable);
Sets whether the application intends to draw on the widget in an ::expose-event handler.
This is a hint to the widget and does not affect the behavior of the GTK+ core; many widgets ignore this flag entirely. For widgets that do pay attention to the flag, such as GtkEventBox and GtkWindow, the effect is to suppress default themed drawing of the widget's background. (Children of the widget will still be drawn.) The application is then entirely responsible for drawing the widget background.
| widget: | a GtkWidget | 
| app_paintable: | TRUEif the application will paint on the widget | 
void gtk_widget_set_double_buffered (GtkWidget *widget, gboolean double_buffered);
Widgets are double buffered by default; you can use this function
to turn off the buffering. "Double buffered" simply means that
gdk_window_begin_paint_region() and gdk_window_end_paint() are called
automatically around expose events sent to the
widget. gdk_window_begin_paint() diverts all drawing to a widget's
window to an offscreen buffer, and gdk_window_end_paint() draws the
buffer to the screen. The result is that users see the window
update in one smooth step, and don't see individual graphics
primitives being rendered.
In very simple terms, double buffered widgets don't flicker, so you would only use this function to turn off double buffering if you had special needs and really knew what you were doing.
| widget: | a GtkWidget | 
| double_buffered: | TRUEto double-buffer a widget | 
void        gtk_widget_set_redraw_on_allocate
                                            (GtkWidget *widget,
                                             gboolean redraw_on_allocate);
Sets whether the entire widget is queued for drawing when its size 
allocation changes. By default, this setting is TRUE and
the entire widget is redrawn on every size change. If your widget
leaves the upper left unchanged when made bigger, turning this
setting on will improve performance.
Note that for NO_WINDOW widgets setting this flag to FALSE turns
off all allocation on resizing: the widget will not even redraw if
its position changes; this is to allow containers that don't draw
anything to avoid excess invalidations. If you set this flag on a
NO_WINDOW widget that does draw on widget->window, 
you are responsible for invalidating both the old and new allocation 
of the widget when the widget is moved and responsible for invalidating
regions newly when the widget increases size.
| widget: | a GtkWidget | 
| redraw_on_allocate: | if TRUE, the entire widget will be redrawn
  when it is allocated to a new size. Otherwise, only the
  new portion of the widget will be redrawn. | 
void gtk_widget_set_composite_name (GtkWidget *widget, const gchar *name);
Sets a widgets composite name. The widget must be
a composite child of its parent; see gtk_widget_push_composite_child().
| widget: | a GtkWidget. | 
| name: | the name to set. | 
gboolean gtk_widget_set_scroll_adjustments (GtkWidget *widget, GtkAdjustment *hadjustment, GtkAdjustment *vadjustment);
For widgets that support scrolling, sets the scroll adjustments and
returns TRUE.  For widgets that don't support scrolling, does
nothing and returns FALSE. Widgets that don't support scrolling
can be scrolled by placing them in a GtkViewport, which does
support scrolling.
| widget: | a GtkWidget | 
| hadjustment: | an adjustment for horizontal scrolling, or NULL | 
| vadjustment: | an adjustment for vertical scrolling, or NULL | 
| Returns : | TRUEif the widget supports scrolling | 
gboolean gtk_widget_mnemonic_activate (GtkWidget *widget, gboolean group_cycling);
| widget: | |
| group_cycling: | |
| Returns : | 
void        gtk_widget_class_install_style_property
                                            (GtkWidgetClass *klass,
                                             GParamSpec *pspec);
Installs a style property on a widget class. The parser for the
style property is determined by the value type of pspec.
| klass: | a GtkWidgetClass | 
| pspec: | the GParamSpec for the property | 
void        gtk_widget_class_install_style_property_parser
                                            (GtkWidgetClass *klass,
                                             GParamSpec *pspec,
                                             GtkRcPropertyParser parser);
Installs a style property on a widget class.
| klass: | a GtkWidgetClass | 
| pspec: | the GParamSpec for the style property | 
| parser: | the parser for the style property | 
GParamSpec* gtk_widget_class_find_style_property (GtkWidgetClass *klass, const gchar *property_name);
Finds a style property of a widget class by name.
| klass: | a GtkWidgetClass | 
| property_name: | the name of the style property to find | 
| Returns : | the GParamSpec of the style property or NULLifclasshas no
  style property with that name. | 
Since 2.2
GParamSpec** gtk_widget_class_list_style_properties (GtkWidgetClass *klass, guint *n_properties);
Returns all style properties of a widget class.
| klass: | a GtkWidgetClass | 
| n_properties: | location to return the number of style properties found | 
| Returns : | an newly allocated array of GParamSpec*. The array must be freed with g_free(). | 
Since 2.2
GdkRegion* gtk_widget_region_intersect (GtkWidget *widget, GdkRegion *region);
Computes the intersection of a widget's area and region, returning
the intersection. The result may be empty, use gdk_region_empty() to
check.
| widget: | a GtkWidget | 
| region: | a GdkRegion, in the same coordinate system as widget->allocation. That is, relative towidget->windowforNO_WINDOWwidgets; relative to the parent window
         ofwidget->windowfor widgets with their own window. | 
| Returns : | A newly allocated region holding the intersection of widgetandregion. The coordinates of the return value are
          relative towidget->windowforNO_WINDOWwidgets, and
          relative to the parent window ofwidget->windowfor
          widgets with their own window. | 
gint gtk_widget_send_expose (GtkWidget *widget, GdkEvent *event);
Very rarely-used function. This function is used to emit
an expose event signals on a widget. This function is not
normally used directly. The only time it is used is when
propagating an expose event to a child NO_WINDOW widget, and
that is normally done using gtk_container_propagate_expose().
If you want to force an area of a window to be redrawn, 
use gdk_window_invalidate_rect() or gdk_window_invalidate_region().
To cause the redraw to be done immediately, follow that call
with a call to gdk_window_process_updates().
void gtk_widget_style_get (GtkWidget *widget, const gchar *first_property_name, ...);
Gets the values of a multiple style properties of widget.
| widget: | a GtkWidget | 
| first_property_name: | the name of the first property to get | 
| ...: | pairs of property names and locations to 
  return the property values, starting with the location for first_property_name, terminated byNULL. | 
void gtk_widget_style_get_property (GtkWidget *widget, const gchar *property_name, GValue *value);
Gets the value of a style property of widget.
| widget: | a GtkWidget | 
| property_name: | the name of a style property | 
| value: | location to return the property value | 
void gtk_widget_style_get_valist (GtkWidget *widget, const gchar *first_property_name, va_list var_args);
Non-vararg variant of gtk_widget_style_get(). Used primarily by language 
bindings.
| widget: | a GtkWidget | 
| first_property_name: | the name of the first property to get | 
| var_args: | a va_list of pairs of property names and
    locations to return the property values, starting with the location
    for first_property_name. | 
AtkObject* gtk_widget_get_accessible (GtkWidget *widget);
Returns the accessible object that describes the widget to an assistive technology.
If no accessibility library is loaded (i.e. no ATK implementation library is 
loaded via GTK_MODULES or via another application library, 
such as libgnome), then this AtkObject instance may be a no-op. Likewise, 
if no class-specific AtkObject implementation is available for the widget 
instance in question, it will inherit an AtkObject implementation from the 
first ancestor class for which such an implementation is defined.
The documentation of the ATK library contains more information about accessible objects and their uses.
gboolean gtk_widget_child_focus (GtkWidget *widget, GtkDirectionType direction);
This function is used by custom widget implementations; if you're
writing an app, you'd use gtk_widget_grab_focus() to move the focus
to a particular widget, and gtk_container_set_focus_chain() to
change the focus tab order. So you may want to investigate those
functions instead.
gtk_widget_child_focus() is called by containers as the user moves
around the window using keyboard shortcuts. direction indicates
what kind of motion is taking place (up, down, left, right, tab
forward, tab backward).  gtk_widget_child_focus() invokes the
"focus" signal on GtkWidget; widgets override the default handler
for this signal in order to implement appropriate focus behavior.
The "focus" default handler for a widget should return TRUE if
moving in direction left the focus on a focusable location inside
that widget, and FALSE if moving in direction moved the focus
outside the widget. If returning TRUE, widgets normally
call gtk_widget_grab_focus() to place the focus accordingly;
if returning FALSE, they don't modify the current focus location.
This function replaces gtk_container_focus() from GTK+ 1.2.  It was
necessary to check that the child was visible, sensitive, and
focusable before calling
gtk_container_focus(). gtk_widget_child_focus() returns FALSE if
the widget is not currently in a focusable state, so there's no
need for those checks.
| widget: | a GtkWidget | 
| direction: | direction of focus movement | 
| Returns : | TRUEif focus ended up insidewidget | 
void gtk_widget_child_notify (GtkWidget *widget, const gchar *child_property);
Emits a "child-notify" signal for the 
child property child_property 
on widget.
This is the analogue of g_object_notify() for child properties.
| widget: | a GtkWidget | 
| child_property: | the name of a child property installed on the 
                 class of widget's parent. | 
void gtk_widget_freeze_child_notify (GtkWidget *widget);
Stops emission of "child-notify" signals on widget. The signals are
queued until gtk_widget_thaw_child_notify() is called on widget. 
This is the analogue of g_object_freeze_notify() for child properties.
| widget: | a GtkWidget | 
gboolean gtk_widget_get_child_visible (GtkWidget *widget);
Gets the value set with gtk_widget_set_child_visible().
If you feel a need to use this function, your code probably
needs reorganization. 
This function is only useful for container implementations and never should be called by an application.
| widget: | a GtkWidget | 
| Returns : | TRUEif the widget is mapped with the parent. | 
GtkWidget* gtk_widget_get_parent (GtkWidget *widget);
Returns the parent container of widget.
| widget: | a GtkWidget | 
| Returns : | the parent container of widget, orNULL | 
GtkSettings* gtk_widget_get_settings (GtkWidget *widget);
Gets the settings object holding the settings (global property settings, RC file information, etc) used for this widget.
Note that this function can only be called when the GtkWidget is attached to a toplevel, since the settings object is specific to a particular GdkScreen.
| widget: | a GtkWidget | 
| Returns : | the relevant GtkSettings object | 
GtkClipboard* gtk_widget_get_clipboard (GtkWidget *widget, GdkAtom selection);
Returns the clipboard object for the given selection to
be used with widget. widget must have a GdkDisplay
associated with it, so must be attached to a toplevel
window.
| widget: | a GtkWidget | 
| selection: | a GdkAtom which identifies the clipboard
            to use. GDK_SELECTION_CLIPBOARDgives the
            default clipboard. Another common value
            isGDK_SELECTION_PRIMARY, which gives
            the primary X selection. | 
| Returns : | the appropriate clipboard object. If no clipboard already exists, a new one will be created. Once a clipboard object has been created, it is persistent for all time. | 
Since 2.2
GdkDisplay* gtk_widget_get_display (GtkWidget *widget);
Get the GdkDisplay for the toplevel window associated with this widget. This function can only be called after the widget has been added to a widget hierarchy with a GtkWindow at the top.
In general, you should only create display specific resources when a widget has been realized, and you should free those resources when the widget is unrealized.
| widget: | a GtkWidget | 
| Returns : | the GdkDisplay for the toplevel for this widget. | 
Since 2.2
GdkWindow* gtk_widget_get_root_window (GtkWidget *widget);
Get the root window where this widget is located. This function can only be called after the widget has been added to a widget heirarchy with GtkWindow at the top.
The root window is useful for such purposes as creating a popup GdkWindow associated with the window. In general, you should only create display specific resources when a widget has been realized, and you should free those resources when the widget is unrealized.
Since 2.2
GdkScreen* gtk_widget_get_screen (GtkWidget *widget);
Get the GdkScreen from the toplevel window associated with this widget. This function can only be called after the widget has been added to a widget hierarchy with a GtkWindow at the top.
In general, you should only create screen specific resources when a widget has been realized, and you should free those resources when the widget is unrealized.
Since 2.2
gboolean gtk_widget_has_screen (GtkWidget *widget);
Checks whether there is a GdkScreen is associated with this widget. All toplevel widgets have an associated screen, and all widgets added into a heirarchy with a toplevel window at the top.
Since 2.2
void gtk_widget_get_size_request (GtkWidget *widget, gint *width, gint *height);
Gets the size request that was explicitly set for the widget using
gtk_widget_set_size_request().  A value of -1 stored in width or
height indicates that that dimension has not been set explicitly
and the natural requisition of the widget will be used intead. See
gtk_widget_set_size_request(). To get the size a widget will
actually use, call gtk_widget_size_request() instead of
this function.
| widget: | a GtkWidget | 
| width: | return location for width, or NULL | 
| height: | return location for height, or NULL | 
#define gtk_widget_pop_visual() ((void) 0)
gtk_widget_pop_visual is deprecated and should not be used in newly-written code.
This function is deprecated; it does nothing.
#define gtk_widget_push_visual(visual) ((void) 0)
gtk_widget_push_visual is deprecated and should not be used in newly-written code.
This function is deprecated; it does nothing.
| visual: | 
void gtk_widget_set_child_visible (GtkWidget *widget, gboolean is_visible);
Sets whether widget should be mapped along with its when its parent
is mapped and widget has been shown with gtk_widget_show(). 
The child visibility can be set for widget before it is added to
a container with gtk_widget_set_parent(), to avoid mapping
children unnecessary before immediately unmapping them. However
it will be reset to its default state of TRUE when the widget
is removed from a container.
Note that changing the child visibility of a widget does not queue a resize on the widget. Most of the time, the size of a widget is computed from all visible children, whether or not they are mapped. If this is not the case, the container can queue a resize itself.
This function is only useful for container implementations and never should be called by an application.
| widget: | a GtkWidget | 
| is_visible: | if TRUE,widgetshould be mapped along with its parent. | 
#define gtk_widget_set_default_visual(visual) ((void) 0)
gtk_widget_set_default_visual is deprecated and should not be used in newly-written code.
This function is deprecated; it does nothing.
| visual: | 
void gtk_widget_set_size_request (GtkWidget *widget, gint width, gint height);
Sets the minimum size of a widget; that is, the widget's size
request will be width by height. You can use this function to
force a widget to be either larger or smaller than it normally
would be.
In most cases, gtk_window_set_default_size() is a better choice for
toplevel windows than this function; setting the default size will
still allow users to shrink the window. Setting the size request
will force them to leave the window at least as large as the size
request. When dealing with window sizes,
gtk_window_set_geometry_hints() can be a useful function as well.
Note the inherent danger of setting any fixed size - themes, translations into other languages, different fonts, and user action can all change the appropriate size for a given widget. So, it's basically impossible to hardcode a size that will always be correct.
The size request of a widget is the smallest size a widget can accept while still functioning well and drawing itself correctly. However in some strange cases a widget may be allocated less than its requested size, and in many cases a widget may be allocated more space than it requested.
If the size request in a given direction is -1 (unset), then the "natural" size request of the widget will be used instead.
Widgets can't actually be allocated a size less than 1 by 1, but you can pass 0,0 to this function to mean "as small as possible."
| widget: | a GtkWidget | 
| width: | width widgetshould request, or -1 to unset | 
| height: | height widgetshould request, or -1 to unset | 
#define gtk_widget_set_visual(widget,visual) ((void) 0)
gtk_widget_set_visual is deprecated and should not be used in newly-written code.
This function is deprecated; it does nothing.
| widget: | |
| visual: | 
void gtk_widget_thaw_child_notify (GtkWidget *widget);
Reverts the effect of a previous call to gtk_widget_freeze_child_notify().
This causes all queued "child-notify" signals on widget to be emitted.
| widget: | a GtkWidget | 
void gtk_widget_set_no_show_all (GtkWidget *widget, gboolean no_show_all);
Sets the "no_show_all" property, which determines whether calls to 
gtk_widget_show_all() and gtk_widget_hide_all() will affect this widget. 
This is mostly for use in constructing widget hierarchies with externally controlled visibility, see GtkUIManager.
| widget: | a GtkWidget | 
| no_show_all: | the new value for the "no_show_all" property | 
Since 2.4
gboolean gtk_widget_get_no_show_all (GtkWidget *widget);
Returns the current value of the "no_show_all" property, which determines
whether calls to gtk_widget_show_all() and gtk_widget_hide_all() 
will affect this widget.
| widget: | a GtkWidget | 
| Returns : | the current value of the "no_show_all" property. | 
Since 2.4
GList* gtk_widget_list_mnemonic_labels (GtkWidget *widget);
Returns a newly allocated list of the widgets, normally labels, for 
which this widget is a the target of a mnemonic (see for example, 
gtk_label_set_mnemonic_widget()).
The widgets in the list are not individually referenced. If you
want to iterate through the list and perform actions involving
callbacks that might destroy the widgets, you
must call g_list_foreach (result,
(GFunc)g_object_ref, NULL) first, and then unref all the
widgets afterwards.
| widget: | a GtkWidget | 
| Returns : | the list of mnemonic labels; free this list
 with g_list_free()when you are done with it. | 
Since 2.4
void gtk_widget_add_mnemonic_label (GtkWidget *widget, GtkWidget *label);
Adds a widget to the list of mnemonic labels for
this widget. (See gtk_widget_list_mnemonic_labels()). Note the
list of mnemonic labels for the widget is cleared when the
widget is destroyed, so the caller must make sure to update
its internal state at this point as well, by using a connection
to the ::destroy signal or a weak notifier.
Since 2.4
void        gtk_widget_remove_mnemonic_label
                                            (GtkWidget *widget,
                                             GtkWidget *label);
Removes a widget from the list of mnemonic labels for
this widget. (See gtk_widget_list_mnemonic_labels()). The widget
must have previously been added to the list with
gtk_widget_add_mnemonic_label().
| widget: | a GtkWidget | 
| label: | a GtkWidget that was previously set as a mnemnic label for widgetwithgtk_widget_add_mnemonic_label(). | 
Since 2.4
GtkRequisition* gtk_requisition_copy (const GtkRequisition *requisition);
Copies a GtkRequisition.
| requisition: | a GtkRequisition. | 
| Returns : | a copy of requisition. | 
void gtk_requisition_free (GtkRequisition *requisition);
Frees a GtkRequisition.
| requisition: | a GtkRequisition. | 
app-paintable" property"app-paintable" gboolean : Read / Write
Whether the application will paint directly on the widget.
Default value: FALSE
can-default" property"can-default" gboolean : Read / Write
Whether the widget can be the default widget.
Default value: FALSE
can-focus" property"can-focus" gboolean : Read / Write
Whether the widget can accept the input focus.
Default value: FALSE
composite-child" property"composite-child" gboolean : Read
Whether the widget is part of a composite widget.
Default value: FALSE
events" property"events" GdkEventMask : Read / Write
The event mask that decides what kind of GdkEvents this widget gets.
Default value: GDK_STRUCTURE_MASK
extension-events" property"extension-events" GdkExtensionMode : Read / Write
The mask that decides what kind of extension events this widget gets.
Default value: GDK_EXTENSION_EVENTS_NONE
has-default" property"has-default" gboolean : Read / Write
Whether the widget is the default widget.
Default value: FALSE
has-focus" property"has-focus" gboolean : Read / Write
Whether the widget has the input focus.
Default value: FALSE
height-request" property"height-request" gint : Read / Write
Override for height request of the widget, or -1 if natural request should be used.
Allowed values: >= -1
Default value: -1
is-focus" property"is-focus" gboolean : Read / Write
Whether the widget is the focus widget within the toplevel.
Default value: FALSE
no-show-all" property"no-show-all" gboolean : Read / Write
Whether gtk_widget_show_all() should not affect this widget.
Default value: FALSE
parent" property"parent" GtkContainer : Read / Write
The parent widget of this widget. Must be a Container widget.
receives-default" property"receives-default" gboolean : Read / Write
If TRUE, the widget will receive the default action when it is focused.
Default value: FALSE
sensitive" property"sensitive" gboolean : Read / Write
Whether the widget responds to input.
Default value: TRUE
style" property"style" GtkStyle : Read / Write
The style of the widget, which contains information about how it will look (colors etc).
visible" property"visible" gboolean : Read / Write
Whether the widget is visible.
Default value: FALSE
width-request" property"width-request" gint : Read / Write
Override for width request of the widget, or -1 if natural request should be used.
Allowed values: >= -1
Default value: -1
cursor-aspect-ratio" style property"cursor-aspect-ratio" gfloat : Read
Aspect ratio with which to draw insertion cursor.
Allowed values: [0,1]
Default value: 0.04
cursor-color" style property"cursor-color" GdkColor : Read
Color with which to draw insertion cursor.
draw-border" style property"draw-border" GtkBorder : Read
Size of areas outside the widget's allocation to draw.
focus-line-pattern" style property"focus-line-pattern" gchararray : Read
Dash pattern used to draw the focus indicator.
Default value: "\001\001"
focus-line-width" style property"focus-line-width" gint : Read
Width, in pixels, of the focus indicator line.
Allowed values: >= 0
Default value: 1
focus-padding" style property"focus-padding" gint : Read
Width, in pixels, between focus indicator and the widget 'box'.
Allowed values: >= 0
Default value: 1
interior-focus" style property"interior-focus" gboolean : Read
Whether to draw the focus indicator inside widgets.
Default value: TRUE
secondary-cursor-color" style property"secondary-cursor-color" GdkColor : Read
Color with which to draw the secondary insertion cursor when editing mixed right-to-left and left-to-right text.
void user_function (GtkWidget *widget, gpointer user_data);
| widget: | the object which received the signal. | 
| user_data: | user data set when the signal handler was connected. | 
gboolean user_function (GtkWidget *widget, GdkEventButton *event, gpointer user_data);
| widget: | the object which received the signal. | 
| event: | |
| user_data: | user data set when the signal handler was connected. | 
| Returns : | TRUEto stop other handlers from being invoked for the event.FALSEto propagate the event further. | 
gboolean user_function (GtkWidget *widget, GdkEventButton *event, gpointer user_data);
| widget: | the object which received the signal. | 
| event: | |
| user_data: | user data set when the signal handler was connected. | 
| Returns : | TRUEto stop other handlers from being invoked for the event.FALSEto propagate the event further. | 
gboolean user_function (GtkWidget *widget, guint signal_id, gpointer user_data);
Determines whether an accelerator that activates the signal
identified by signal_id can currently be activated.
This signal is present to allow applications and derived
widgets to override the default GtkWidget handling
for determining whether an accelerator can be activated.
| widget: | the object which received the signal | 
| signal_id: | the ID of a signal installed on widget | 
| returns: | TRUEif the signal can be activated. | 
| user_data: | user data set when the signal handler was connected. | 
void user_function (GtkWidget *widget, GParamSpec *pspec, gpointer user_data);
The ::child-notify signal is emitted for each child property that has changed on an object. The signal's detail holds the property name.
| widget: | the object which received the signal. | 
| pspec: | the GParamSpec of the changed child property. | 
| user_data: | user data set when the signal handler was connected. | 
gboolean user_function (GtkWidget *widget, GdkEventClient *event, gpointer user_data);
| widget: | the object which received the signal. | 
| event: | |
| user_data: | user data set when the signal handler was connected. | 
| Returns : | TRUEto stop other handlers from being invoked for the event.FALSEto propagate the event further. | 
gboolean user_function (GtkWidget *widget, GdkEventConfigure *event, gpointer user_data);
| widget: | the object which received the signal. | 
| event: | |
| user_data: | user data set when the signal handler was connected. | 
| Returns : | TRUEto stop other handlers from being invoked for the event.FALSEto propagate the event further. | 
gboolean user_function (GtkWidget *widget, GdkEvent *event, gpointer user_data);
The ::delete-event signal is emitted if a user requests that
a toplevel window is closed. The default handler for this signal
destroys the window. Connecting gtk_widget_hide_on_delete() to
this signal will cause the window to be hidden instead, so that
it can later be shown again without reconstructing it.
| widget: | the object which received the signal. | 
| event: | the event which triggered this signal | 
| user_data: | user data set when the signal handler was connected. | 
| Returns : | TRUEto stop other handlers from being invoked for the event.FALSEto propagate the event further. | 
gboolean user_function (GtkWidget *widget, GdkEvent *event, gpointer user_data);
The ::destroy-event signal is emitted when a GdkWindow is destroyed. You rarely get this signal, because most widgets disconnect themselves from their window before they destroy it, so no widget owns the window at destroy time.
| widget: | the object which received the signal. | 
| event: | the event which triggered this signal | 
| user_data: | user data set when the signal handler was connected. | 
| Returns : | TRUEto stop other handlers from being invoked for the event.FALSEto propagate the event further. | 
void user_function (GtkWidget *widget, GtkTextDirection arg1, gpointer user_data);
| widget: | the object which received the signal. | 
| arg1: | |
| user_data: | user data set when the signal handler was connected. | 
void user_function (GtkWidget *widget, GdkDragContext *drag_context, gpointer user_data);
The ::drag-begin signal is emitted on the drag source when a drag is started. 
A typical reason to connect to this signal is to set up a custom drag icon with
gtk_drag_source_set_icon().
| widget: | the object which received the signal. | 
| drag_context: | the drag context | 
| user_data: | user data set when the signal handler was connected. | 
void user_function (GtkWidget *widget, GdkDragContext *drag_context, gpointer user_data);
The ::drag-data-delete signal is emitted on the drag source when a drag with the action
GDK_ACTION_MOVE is successfully completed. The signal handler is responsible for deleting
the data that has been dropped. What "delete" means, depends on the context of the drag
operation.
| widget: | the object which received the signal. | 
| drag_context: | the drag context | 
| user_data: | user data set when the signal handler was connected. | 
void user_function (GtkWidget *widget, GdkDragContext *drag_context, GtkSelectionData *data, guint info, guint time, gpointer user_data);
The ::drag-data-get signal is emitted on the drag source when the drop site requests
the data which is dragged. It is the responsibility of the signal handler to fill data
with the data in the format which is indicated by info. See gtk_selection_data_set() and 
gtk_selection_data_set_text().
| widget: | the object which received the signal. | 
| drag_context: | the drag context | 
| data: | the GtkSelectionData to be filled with the dragged data | 
| info: | the info that has been registered with the target in the GtkTargetList. | 
| time: | the timestamp at which the data was requested | 
| user_data: | user data set when the signal handler was connected. | 
void user_function (GtkWidget *widget, GdkDragContext *drag_context, gint x, gint y, GtkSelectionData *data, guint info, guint time, gpointer user_data);
The ::drag-data-received signal is emitted on the drop site when the dragged data has been 
received. If the data was received in order to determine whether the drop will be accepted, 
the handler is expected to call gdk_drag_status() and not finish the drag. 
If the data was received in response to a ::drag-drop signal (and this is the last target to be 
received), the handler for this signal is expected to process the received data and then call 
gtk_drag_finish(), setting the success parameter depending on whether the data was processed 
successfully. 
The handler may inspect and modify drag_context->action before calling gtk_drag_finish(), 
e.g. to implement GDK_ACTION_ASK as shown in the following example:
void  
drag_data_received (GtkWidget          *widget,
                    GdkDragContext     *drag_context,
                    gint                x,
                    gint                y,
                    GtkSelectionData   *data,
                    guint               info,
                    guint               time)
{
  if ((data->length >= 0) && (data->format == 8))
    {
      if (drag_context->action == GDK_ACTION_ASK) 
        {
          GtkWidget *dialog;
          gint response;
          
          dialog = gtk_message_dialog_new (NULL,
                                           GTK_DIALOG_MODAL | 
                                           GTK_DIALOG_DESTROY_WITH_PARENT,
                                           GTK_MESSAGE_INFO,
                                           GTK_BUTTONS_YES_NO,
                                           "Move the data ?\n");
          response = gtk_dialog_run (GTK_DIALOG (dialog));
          gtk_widget_destroy (dialog);
            
          if (response == GTK_RESPONSE_YES)
            drag_context->action = GDK_ACTION_MOVE;
          else
            drag_context->action = GDK_ACTION_COPY;
         }
         
      gtk_drag_finish (drag_context, TRUE, FALSE, time);
      return;
    }
      
   gtk_drag_finish (drag_context, FALSE, FALSE, time);
 }
| widget: | the object which received the signal. | 
| drag_context: | the drag context | 
| x: | where the drop happened | 
| y: | where the drop happened | 
| data: | the received data | 
| info: | the info that has been registered with the target in the GtkTargetList. | 
| time: | the timestamp at which the data was received | 
| user_data: | user data set when the signal handler was connected. | 
gboolean user_function (GtkWidget *widget, GdkDragContext *drag_context, gint x, gint y, guint time, gpointer user_data);
The ::drag-drop signal is emitted on the drop site when the user drops the data
onto the widget. The signal handler must determine whether the cursor position is in 
a drop zone or not. If it is not in a drop zone, it returns FALSE and no further 
processing is necessary. Otherwise, the handler returns TRUE. In this case, the handler 
must ensure that gtk_drag_finish() is called to let the source know that the drop is done.
The call to gtk_drag_finish() can be done either directly or in a ::drag-data-received handler
which gets triggered by calling gtk_drop_get_data() to receive the data for one or more of the 
supported targets.
| widget: | the object which received the signal. | 
| drag_context: | the drag context | 
| x: | the x coordinate of the current cursor position | 
| y: | the y coordinate of the current cursor position | 
| time: | the timestamp of the motion event | 
| returns: | whether the cursor position is in a drop zone | 
| user_data: | user data set when the signal handler was connected. | 
void user_function (GtkWidget *widget, GdkDragContext *drag_context, gpointer user_data);
The ::drag-end signal is emitted on the drag source when a drag is finished. A typical reason to connect to this signal is to undo things done in ::drag-begin.
| widget: | the object which received the signal. | 
| drag_context: | the drag context | 
| user_data: | user data set when the signal handler was connected. | 
void user_function (GtkWidget *widget, GdkDragContext *drag_context, guint time, gpointer user_data);
The ::drag-leave signal is emitted on the drop site when the cursor leaves the widget.
A typical reason to connect to this signal is to undo things done in ::drag-motion, e.g.
undo highlighting with gtk_drag_unhighlight()
| widget: | the object which received the signal. | 
| drag_context: | the drag context | 
| time: | the timestamp of the motion event | 
| user_data: | user data set when the signal handler was connected. | 
gboolean user_function (GtkWidget *widget, GdkDragContext *drag_context, gint x, gint y, guint time, gpointer user_data);
The ::drag-motion signal is emitted on the drop site when the user moves the cursor over
the widget during a drag. The signal handler must determine whether the cursor position is in 
a drop zone or not. If it is not in a drop zone, it returns FALSE and no further processing is
necessary. Otherwise, the handler returns TRUE. In this case, the handler is responsible for
providing the necessary information for displaying feedback to the user, by calling
gdk_drag_status(). If the decision whether the drop will be accepted or rejected can't be made
based solely on the cursor position and the type of the data, the handler may inspect the dragged 
data by calling gtk_drag_get_data() and defer the gdk_drag_status() call to the ::drag-data-received 
handler. 
Note that there is no ::drag-enter signal. The drag receiver has to keep track of whether
he has received any ::drag-motion signals since the last ::drag-leave and if not, treat the
::drag-motion signal as an "enter" signal. Upon an "enter", the handler will typically highlight 
the drop site with gtk_drag_highlight().
 
static void
drag_motion (GtkWidget *widget,
      	  GdkDragContext *context,
             gint x,
             gint y,
             guint time)
{
  GdkAtom target;
 
  PrivateData *private_data = GET_PRIVATE_DATA (widget);
 
  if (!private_data->drag_highlight) 
   {
     private_data->drag_highlight = 1;
     gtk_drag_highlight (widget);
   }
 
  target = gtk_drag_dest_find_target (widget, context, NULL);
  if (target == GDK_NONE)
    gdk_drag_status (context, 0, time);
  else 
   {
     private_data->pending_status = context->suggested_action;
     gtk_drag_get_data (widget, context, target, time);
   }
 
  return TRUE;
}
  
static void
drag_data_received (GtkWidget        *widget,
                    GdkDragContext   *context,
                    gint              x,
                    gint              y,
                    GtkSelectionData *selection_data,
                    guint             info,
                    guint             time)
{
  PrivateData *private_data = GET_PRIVATE_DATA (widget);
  
  if (private_data->suggested_action) 
   {
     private_data->suggested_action = 0;
     
    /* We are getting this data due to a request in drag_motion,
     * rather than due to a request in drag_drop, so we are just
     * supposed to call gdk_drag_status(), not actually paste in the data.
     */
     str = gtk_selection_data_get_text (selection_data);
     if (!data_is_acceptable (str)) 
       gdk_drag_status (context, 0, time);
     else
       gdk_drag_status (context, private_data->suggested_action, time);
   }
  else
   {
     /* accept the drop */
   }
}
| widget: | the object which received the signal. | 
| drag_context: | the drag context | 
| x: | the x coordinate of the current cursor position | 
| y: | the y coordinate of the current cursor position | 
| time: | the timestamp of the motion event | 
| returns: | whether the cursor position is in a drop zone | 
| user_data: | user data set when the signal handler was connected. | 
gboolean user_function (GtkWidget *widget, GdkEventCrossing *event, gpointer user_data);
| widget: | the object which received the signal. | 
| event: | |
| user_data: | user data set when the signal handler was connected. | 
| Returns : | TRUEto stop other handlers from being invoked for the event.FALSEto propagate the event further. | 
gboolean user_function (GtkWidget *widget, GdkEvent *event, gpointer user_data);
| widget: | the object which received the signal. | 
| event: | |
| user_data: | user data set when the signal handler was connected. | 
| Returns : | TRUEto stop other handlers from being invoked for the event.FALSEto propagate the event further. | 
void user_function (GtkWidget *widget, GdkEvent *event, gpointer user_data);
| widget: | the object which received the signal. | 
| event: | |
| user_data: | user data set when the signal handler was connected. | 
gboolean user_function (GtkWidget *widget, GdkEventExpose *event, gpointer user_data);
| widget: | the object which received the signal. | 
| event: | |
| user_data: | user data set when the signal handler was connected. | 
| Returns : | TRUEto stop other handlers from being invoked for the event.FALSEto propagate the event further. | 
gboolean user_function (GtkWidget *widget, GtkDirectionType arg1, gpointer user_data);
| widget: | the object which received the signal. | 
| arg1: | |
| user_data: | user data set when the signal handler was connected. | 
| Returns : | TRUEto stop other handlers from being invoked for the event.FALSEto propagate the event further. | 
gboolean user_function (GtkWidget *widget, GdkEventFocus *event, gpointer user_data);
| widget: | the object which received the signal. | 
| event: | |
| user_data: | user data set when the signal handler was connected. | 
| Returns : | TRUEto stop other handlers from being invoked for the event.FALSEto propagate the event further. | 
gboolean user_function (GtkWidget *widget, GdkEventFocus *event, gpointer user_data);
| widget: | the object which received the signal. | 
| event: | |
| user_data: | user data set when the signal handler was connected. | 
| Returns : | TRUEto stop other handlers from being invoked for the event.FALSEto propagate the event further. | 
gboolean user_function (GtkWidget *widget, GdkEvent *event, gpointer user_data);
| widget: | the object which received the signal. | 
| event: | |
| user_data: | user data set when the signal handler was connected. | 
| Returns : | 
void user_function (GtkWidget *widget, gpointer user_data);
| widget: | the object which received the signal. | 
| user_data: | user data set when the signal handler was connected. | 
void user_function (GtkWidget *widget, gboolean arg1, gpointer user_data);
| widget: | the object which received the signal. | 
| arg1: | |
| user_data: | user data set when the signal handler was connected. | 
void user_function (GtkWidget *widget, gpointer user_data);
| widget: | the object which received the signal. | 
| user_data: | user data set when the signal handler was connected. | 
void user_function (GtkWidget *widget, GtkWidget *widget2, gpointer user_data);
Emitted when there is a chance in the hierarchy to which a widget belong. More precisely, a widget is anchored when its toplevel ancestor is a GtkWindow. This signal is emitted when a widget changes from un-anchored to anchored or vice-versa.
| widget: | the object which received the signal. | 
| widget2: | |
| user_data: | user data set when the signal handler was connected. | 
gboolean user_function (GtkWidget *widget, GdkEventKey *event, gpointer user_data);
| widget: | the object which received the signal. | 
| event: | |
| user_data: | user data set when the signal handler was connected. | 
| Returns : | TRUEto stop other handlers from being invoked for the event.FALSEto propagate the event further. | 
gboolean user_function (GtkWidget *widget, GdkEventKey *event, gpointer user_data);
| widget: | the object which received the signal. | 
| event: | |
| user_data: | user data set when the signal handler was connected. | 
| Returns : | TRUEto stop other handlers from being invoked for the event.FALSEto propagate the event further. | 
gboolean user_function (GtkWidget *widget, GdkEventCrossing *event, gpointer user_data);
| widget: | the object which received the signal. | 
| event: | |
| user_data: | user data set when the signal handler was connected. | 
| Returns : | TRUEto stop other handlers from being invoked for the event.FALSEto propagate the event further. | 
void user_function (GtkWidget *widget, gpointer user_data);
| widget: | the object which received the signal. | 
| user_data: | user data set when the signal handler was connected. | 
gboolean user_function (GtkWidget *widget, GdkEvent *event, gpointer user_data);
| widget: | the object which received the signal. | 
| event: | |
| user_data: | user data set when the signal handler was connected. | 
| Returns : | TRUEto stop other handlers from being invoked for the event.FALSEto propagate the event further. | 
gboolean user_function (GtkWidget *widget, gboolean arg1, gpointer user_data);
| widget: | the object which received the signal. | 
| arg1: | |
| user_data: | user data set when the signal handler was connected. | 
| Returns : | 
gboolean user_function (GtkWidget *widget, GdkEventMotion *event, gpointer user_data);
| widget: | the object which received the signal. | 
| event: | |
| user_data: | user data set when the signal handler was connected. | 
| Returns : | TRUEto stop other handlers from being invoked for the event.FALSEto propagate the event further. | 
gboolean user_function (GtkWidget *widget, GdkEventNoExpose *event, gpointer user_data);
| widget: | the object which received the signal. | 
| event: | |
| user_data: | user data set when the signal handler was connected. | 
| Returns : | TRUEto stop other handlers from being invoked for the event.FALSEto propagate the event further. | 
void user_function (GtkWidget *widget, GtkObject *old_parent, gpointer user_data);
| widget: | the object which received the signal. | 
| old_parent: | |
| user_data: | user data set when the signal handler was connected. | 
gboolean user_function (GtkWidget *widget, gpointer user_data);
This signal gets emitted whenever a widget should pop up a context-sensitive menu. This usually happens through the standard key binding mechanism; by pressing a certain key while a widget is focused, the user can cause the widget to pop up a menu. For example, the GtkEntry widget creates a menu with clipboard commands. See the section called “Implement GtkWidget::popup_menu” for an example of how to use this signal.
| widget: | the object which received the signal | 
| returns: | TRUE if a menu was activated | 
| user_data: | user data set when the signal handler was connected. | 
gboolean user_function (GtkWidget *widget, GdkEventProperty *event, gpointer user_data);
| widget: | the object which received the signal. | 
| event: | |
| user_data: | user data set when the signal handler was connected. | 
| Returns : | TRUEto stop other handlers from being invoked for the event.FALSEto propagate the event further. | 
gboolean user_function (GtkWidget *widget, GdkEventProximity *event, gpointer user_data);
| widget: | the object which received the signal. | 
| event: | |
| user_data: | user data set when the signal handler was connected. | 
| Returns : | TRUEto stop other handlers from being invoked for the event.FALSEto propagate the event further. | 
gboolean user_function (GtkWidget *widget, GdkEventProximity *event, gpointer user_data);
| widget: | the object which received the signal. | 
| event: | |
| user_data: | user data set when the signal handler was connected. | 
| Returns : | TRUEto stop other handlers from being invoked for the event.FALSEto propagate the event further. | 
void user_function (GtkWidget *widget, gpointer user_data);
| widget: | the object which received the signal. | 
| user_data: | user data set when the signal handler was connected. | 
void user_function (GtkWidget *widget, GdkScreen *arg1, gpointer user_data);
| widget: | the object which received the signal. | 
| arg1: | |
| user_data: | user data set when the signal handler was connected. | 
gboolean user_function (GtkWidget *widget, GdkEventScroll *event, gpointer user_data);
| widget: | the object which received the signal. | 
| event: | |
| user_data: | user data set when the signal handler was connected. | 
| Returns : | TRUEto stop other handlers from being invoked for the event.FALSEto propagate the event further. | 
gboolean user_function (GtkWidget *widget, GdkEventSelection *event, gpointer user_data);
| widget: | the object which received the signal. | 
| event: | |
| user_data: | user data set when the signal handler was connected. | 
| Returns : | TRUEto stop other handlers from being invoked for the event.FALSEto propagate the event further. | 
void user_function (GtkWidget *widget, GtkSelectionData *data, guint info, guint time, gpointer user_data);
| widget: | the object which received the signal. | 
| data: | |
| info: | |
| time: | |
| user_data: | user data set when the signal handler was connected. | 
gboolean user_function (GtkWidget *widget, GdkEventSelection *event, gpointer user_data);
| widget: | the object which received the signal. | 
| event: | |
| user_data: | user data set when the signal handler was connected. | 
| Returns : | TRUEto stop other handlers from being invoked for the event.FALSEto propagate the event further. | 
void user_function (GtkWidget *widget, GtkSelectionData *data, guint time, gpointer user_data);
| widget: | the object which received the signal. | 
| data: | |
| time: | |
| user_data: | user data set when the signal handler was connected. | 
gboolean user_function (GtkWidget *widget, GdkEventSelection *event, gpointer user_data);
| widget: | the object which received the signal. | 
| event: | |
| user_data: | user data set when the signal handler was connected. | 
| Returns : | TRUEto stop other handlers from being invoked for the event.FALSEto propagate the event further. | 
void user_function (GtkWidget *widget, gpointer user_data);
| widget: | the object which received the signal. | 
| user_data: | user data set when the signal handler was connected. | 
gboolean user_function (GtkWidget *widget, GtkWidgetHelpType arg1, gpointer user_data);
| widget: | the object which received the signal. | 
| arg1: | |
| user_data: | user data set when the signal handler was connected. | 
| Returns : | 
void user_function (GtkWidget *widget, GtkAllocation *allocation, gpointer user_data);
| widget: | the object which received the signal. | 
| allocation: | |
| user_data: | user data set when the signal handler was connected. | 
void user_function (GtkWidget *widget, GtkRequisition *requisition, gpointer user_data);
| widget: | the object which received the signal. | 
| requisition: | |
| user_data: | user data set when the signal handler was connected. | 
void user_function (GtkWidget *widget, GtkStateType state, gpointer user_data);
| widget: | the object which received the signal. | 
| state: | |
| user_data: | user data set when the signal handler was connected. | 
void user_function (GtkWidget *widget, GtkStyle *previous_style, gpointer user_data);
The style-set signal is emitted when a new style has been set 
on a widget. Note that style-modifying functions like 
gtk_widget_modify_base() also cause this signal to be emitted.
| widget: | the object on which the signal is emitted | 
| previous_style: | the previous style, or NULLif the widget 
  just got its initial style | 
| user_data: | user data set when the signal handler was connected. | 
void user_function (GtkWidget *widget, gpointer user_data);
| widget: | the object which received the signal. | 
| user_data: | user data set when the signal handler was connected. | 
gboolean user_function (GtkWidget *widget, GdkEvent *event, gpointer user_data);
| widget: | the object which received the signal. | 
| event: | |
| user_data: | user data set when the signal handler was connected. | 
| Returns : | TRUEto stop other handlers from being invoked for the event.FALSEto propagate the event further. | 
void user_function (GtkWidget *widget, gpointer user_data);
| widget: | the object which received the signal. | 
| user_data: | user data set when the signal handler was connected. | 
gboolean user_function (GtkWidget *widget, GdkEventVisibility *event, gpointer user_data);
| widget: | the object which received the signal. | 
| event: | |
| user_data: | user data set when the signal handler was connected. | 
| Returns : | TRUEto stop other handlers from being invoked for the event.FALSEto propagate the event further. | 
gboolean user_function (GtkWidget *widget, GdkEventWindowState *event, gpointer user_data);
| widget: | the object which received the signal. | 
| event: | |
| user_data: | user data set when the signal handler was connected. | 
| Returns : | TRUEto stop other handlers from being invoked for the event.FALSEto propagate the event further. | 
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