gdk_events_pending ()

gboolean
gdk_events_pending (void);

Checks if any events are ready to be processed for any display.

gdk_event_peek ()

GdkEvent *
gdk_event_peek (void);

If there is an event waiting in the event queue of some open display, returns a copy of it. See gdk_display_peek_event().

gdk_event_get ()

GdkEvent *
gdk_event_get (void);

Checks all open displays for a GdkEvent to process,to be processed on, fetching events from the windowing system if necessary. See gdk_display_get_event().

gdk_event_get_graphics_expose ()

GdkEvent *
gdk_event_get_graphics_expose (GdkWindow *window);

Waits for a GraphicsExpose or NoExpose event from the X server. This is used in the GtkText and GtkCList widgets in GTK+ to make sure any GraphicsExpose events are handled before the widget is scrolled.

gdk_event_put ()

void
gdk_event_put (const GdkEvent *event);

Appends a copy of the given event onto the front of the event queue for event->any.window's display, or the default event queue if event->any.window is NULL. See gdk_display_put_event().

gdk_event_new ()

GdkEvent *
gdk_event_new (GdkEventType type);

Creates a new event of the given type. All fields are set to 0.

Since: 2.2

gdk_event_copy ()

GdkEvent *
gdk_event_copy (const GdkEvent *event);

Copies a GdkEvent, copying or incrementing the reference count of the resources associated with it (e.g. GdkWindow's and strings).

gdk_event_free ()

void
gdk_event_free (GdkEvent *event);

Frees a GdkEvent, freeing or decrementing any resources associated with it. Note that this function should only be called with events returned from functions such as gdk_event_peek(), gdk_event_get(), gdk_event_get_graphics_expose() and gdk_event_copy() and gdk_event_new().

gdk_event_get_time ()

guint32
gdk_event_get_time (const GdkEvent *event);

Returns the time stamp from event , if there is one; otherwise returns GDK_CURRENT_TIME. If event is NULL, returns GDK_CURRENT_TIME.

gdk_event_get_state ()

gboolean
gdk_event_get_state (const GdkEvent *event,
                     GdkModifierType *state);

If the event contains a "state" field, puts that field in state . Otherwise stores an empty state (0). Returns TRUE if there was a state field in the event. event may be NULL, in which case it's treated as if the event had no state field.

gdk_event_get_axis ()

gboolean
gdk_event_get_axis (const GdkEvent *event,
                    GdkAxisUse axis_use,
                    gdouble *value);

Extract the axis value for a particular axis use from an event structure.

gdk_event_get_coords ()

gboolean
gdk_event_get_coords (const GdkEvent *event,
                      gdouble *x_win,
                      gdouble *y_win);

Extract the event window relative x/y coordinates from an event.

gdk_event_get_root_coords ()

gboolean
gdk_event_get_root_coords (const GdkEvent *event,
                           gdouble *x_root,
                           gdouble *y_root);

Extract the root window relative x/y coordinates from an event.

gdk_event_request_motions ()

void
gdk_event_request_motions (const GdkEventMotion *event);

Request more motion notifies if event is a motion notify hint event. This function should be used instead of gdk_window_get_pointer() to request further motion notifies, because it also works for extension events where motion notifies are provided for devices other than the core pointer. Coordinate extraction, processing and requesting more motion events from a GDK_MOTION_NOTIFY event usually works like this:

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{ 
  /* motion_event handler */
  x = motion_event->x;
  y = motion_event->y;
  /* handle (x,y) motion */
  gdk_event_request_motions (motion_event); /* handles is_hint events */
}

Since: 2.12

gdk_event_handler_set ()

void
gdk_event_handler_set (GdkEventFunc func,
                       gpointer data,
                       GDestroyNotify notify);

Sets the function to call to handle all events from GDK.

Note that GTK+ uses this to install its own event handler, so it is usually not useful for GTK+ applications. (Although an application can call this function then call gtk_main_do_event() to pass events to GTK+.)

GdkEventFunc ()

void
(*GdkEventFunc) (GdkEvent *event,
                 gpointer data);

Specifies the type of function passed to gdk_event_handler_set() to handle all GDK events.

gdk_event_send_client_message ()

gboolean
gdk_event_send_client_message (GdkEvent *event,
                               GdkNativeWindow winid);

Sends an X ClientMessage event to a given window (which must be on the default GdkDisplay.) This could be used for communicating between different applications, though the amount of data is limited to 20 bytes.

gdk_event_send_client_message_for_display ()

gboolean
gdk_event_send_client_message_for_display
                               (GdkDisplay *display,
                                GdkEvent *event,
                                GdkNativeWindow winid);

On X11, sends an X ClientMessage event to a given window. On Windows, sends a message registered with the name GDK_WIN32_CLIENT_MESSAGE.

This could be used for communicating between different applications, though the amount of data is limited to 20 bytes on X11, and to just four bytes on Windows.

Since: 2.2

gdk_event_send_clientmessage_toall ()

void
gdk_event_send_clientmessage_toall (GdkEvent *event);

Sends an X ClientMessage event to all toplevel windows on the default GdkScreen.

Toplevel windows are determined by checking for the WM_STATE property, as described in the Inter-Client Communication Conventions Manual (ICCCM). If no windows are found with the WM_STATE property set, the message is sent to all children of the root window.

gdk_add_client_message_filter ()

void
gdk_add_client_message_filter (GdkAtom message_type,
                               GdkFilterFunc func,
                               gpointer data);

Adds a filter to the default display to be called when X ClientMessage events are received. See gdk_display_add_client_message_filter().

gdk_get_show_events ()

gboolean
gdk_get_show_events (void);

Gets whether event debugging output is enabled.

gdk_set_show_events ()

void
gdk_set_show_events (gboolean show_events);

Sets whether a trace of received events is output. Note that GTK+ must be compiled with debugging (that is, configured using the --enable-debug option) to use this option.

gdk_event_set_screen ()

void
gdk_event_set_screen (GdkEvent *event,
                      GdkScreen *screen);

Sets the screen for event to screen . The event must have been allocated by GTK+, for instance, by gdk_event_copy().

Since: 2.2

gdk_event_get_screen ()

GdkScreen *
gdk_event_get_screen (const GdkEvent *event);

Returns the screen for the event. The screen is typically the screen for event->any.window, but for events such as mouse events, it is the screen where the pointer was when the event occurs - that is, the screen which has the root window to which event->motion.x_root and event->motion.y_root are relative.

Since: 2.2

gdk_setting_get ()

gboolean
gdk_setting_get (const gchar *name,
                 GValue *value);

Obtains a desktop-wide setting, such as the double-click time, for the default screen. See gdk_screen_get_setting().

enum GdkEventType

Specifies the type of the event.

Do not confuse these events with the signals that GTK+ widgets emit. Although many of these events result in corresponding signals being emitted, the events are often transformed or filtered along the way.

enum GdkEventMask

A set of bit-flags to indicate which events a window is to receive. Most of these masks map onto one or more of the GdkEventType event types above.

GDK_POINTER_MOTION_HINT_MASK is a special mask which is used to reduce the number of GDK_MOTION_NOTIFY events received. Normally a GDK_MOTION_NOTIFY event is received each time the mouse moves. However, if the application spends a lot of time processing the event (updating the display, for example), it can lag behind the position of the mouse. When using GDK_POINTER_MOTION_HINT_MASK, fewer GDK_MOTION_NOTIFY events will be sent, some of which are marked as a hint (the is_hint member is TRUE). To receive more motion events after a motion hint event, the application needs to asks for more, by calling gdk_event_request_motions().

GDK_CURRENT_TIME

#define GDK_CURRENT_TIME     0L

Represents the current time, and can be used anywhere a time is expected.

GDK_PRIORITY_EVENTS

#define             GDK_PRIORITY_EVENTS

This is the priority that events from the X server are given in the GLib Main Loop.

GDK_PRIORITY_REDRAW

#define GDK_PRIORITY_REDRAW     (G_PRIORITY_HIGH_IDLE + 20)

This is the priority that the idle handler processing window updates is given in the GLib Main Loop.