/* GDK - The GIMP Drawing Kit * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /* * Modified by the GTK+ Team and others 1997-2000. See the AUTHORS * file for a list of people on the GTK+ Team. See the ChangeLog * files for a list of changes. These files are distributed with * GTK+ at ftp://ftp.gtk.org/pub/gtk/. */ #include "config.h" #include /* For memset() */ #include #include "gdk.h" #include "gdkinternals.h" typedef struct _GdkIOClosure GdkIOClosure; struct _GdkIOClosure { GDestroyNotify notify; gpointer data; }; /* Private variable declarations */ GdkEventFunc _gdk_event_func = NULL; /* Callback for events */ gpointer _gdk_event_data = NULL; GDestroyNotify _gdk_event_notify = NULL; /********************************************* * Functions for maintaining the event queue * *********************************************/ /** * _gdk_event_queue_find_first: * @display: a #GdkDisplay * * Find the first event on the queue that is not still * being filled in. * * Return value: Pointer to the list node for that event, or NULL. **/ GList* _gdk_event_queue_find_first (GdkDisplay *display) { GList *tmp_list = display->queued_events; while (tmp_list) { GdkEventPrivate *event = tmp_list->data; if (!(event->flags & GDK_EVENT_PENDING)) return tmp_list; tmp_list = g_list_next (tmp_list); } return NULL; } /** * _gdk_event_queue_prepend: * @display: a #GdkDisplay * @event: Event to prepend. * * Prepends an event before the head of the event queue. * * Returns: the newly prepended list node. **/ GList* _gdk_event_queue_prepend (GdkDisplay *display, GdkEvent *event) { display->queued_events = g_list_prepend (display->queued_events, event); if (!display->queued_tail) display->queued_tail = display->queued_events; return display->queued_events; } /** * _gdk_event_queue_append: * @display: a #GdkDisplay * @event: Event to append. * * Appends an event onto the tail of the event queue. * * Returns: the newly appended list node. **/ GList * _gdk_event_queue_append (GdkDisplay *display, GdkEvent *event) { display->queued_tail = g_list_append (display->queued_tail, event); if (!display->queued_events) display->queued_events = display->queued_tail; else display->queued_tail = display->queued_tail->next; return display->queued_tail; } /** * _gdk_event_queue_insert_after: * @display: a #GdkDisplay * @sibling: Append after this event. * @event: Event to append. * * Appends an event after the specified event, or if it isn't in * the queue, onto the tail of the event queue. * * Returns: the newly appended list node. * * Since: 2.16 */ GList* _gdk_event_queue_insert_after (GdkDisplay *display, GdkEvent *sibling, GdkEvent *event) { GList *prev = g_list_find (display->queued_events, sibling); if (prev && prev->next) { display->queued_events = g_list_insert_before (display->queued_events, prev->next, event); return prev->next; } else return _gdk_event_queue_append (display, event); } /** * _gdk_event_queue_insert_after: * @display: a #GdkDisplay * @sibling: Append after this event. * @event: Event to append. * * Appends an event before the specified event, or if it isn't in * the queue, onto the tail of the event queue. * * Returns: the newly appended list node. * * Since: 2.16 */ GList* _gdk_event_queue_insert_before (GdkDisplay *display, GdkEvent *sibling, GdkEvent *event) { GList *next = g_list_find (display->queued_events, sibling); if (next) { display->queued_events = g_list_insert_before (display->queued_events, next, event); return next->prev; } else return _gdk_event_queue_append (display, event); } /** * _gdk_event_queue_remove_link: * @display: a #GdkDisplay * @node: node to remove * * Removes a specified list node from the event queue. **/ void _gdk_event_queue_remove_link (GdkDisplay *display, GList *node) { if (node->prev) node->prev->next = node->next; else display->queued_events = node->next; if (node->next) node->next->prev = node->prev; else display->queued_tail = node->prev; } /** * _gdk_event_unqueue: * @display: a #GdkDisplay * * Removes and returns the first event from the event * queue that is not still being filled in. * * Return value: the event, or %NULL. Ownership is transferred * to the caller. **/ GdkEvent* _gdk_event_unqueue (GdkDisplay *display) { GdkEvent *event = NULL; GList *tmp_list; tmp_list = _gdk_event_queue_find_first (display); if (tmp_list) { event = tmp_list->data; _gdk_event_queue_remove_link (display, tmp_list); g_list_free_1 (tmp_list); } return event; } /** * gdk_event_handler_set: * @func: the function to call to handle events from GDK. * @data: user data to pass to the function. * @notify: the function to call when the handler function is removed, i.e. when * gdk_event_handler_set() is called with another event handler. * * 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+.) **/ void gdk_event_handler_set (GdkEventFunc func, gpointer data, GDestroyNotify notify) { if (_gdk_event_notify) (*_gdk_event_notify) (_gdk_event_data); _gdk_event_func = func; _gdk_event_data = data; _gdk_event_notify = notify; } /** * gdk_event_get: * * 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(). * * Return value: the next #GdkEvent to be processed, or %NULL if no events * are pending. The returned #GdkEvent should be freed with gdk_event_free(). **/ GdkEvent* gdk_event_get (void) { GSList *tmp_list; for (tmp_list = _gdk_displays; tmp_list; tmp_list = tmp_list->next) { GdkEvent *event = gdk_display_get_event (tmp_list->data); if (event) return event; } return NULL; } /** * gdk_event_peek: * * If there is an event waiting in the event queue of some open * display, returns a copy of it. See gdk_display_peek_event(). * * Return value: a copy of the first #GdkEvent on some event queue, or %NULL if no * events are in any queues. The returned #GdkEvent should be freed with * gdk_event_free(). **/ GdkEvent* gdk_event_peek (void) { GSList *tmp_list; for (tmp_list = _gdk_displays; tmp_list; tmp_list = tmp_list->next) { GdkEvent *event = gdk_display_peek_event (tmp_list->data); if (event) return event; } return NULL; } /** * gdk_event_put: * @event: a #GdkEvent. * * 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(). **/ void gdk_event_put (const GdkEvent *event) { GdkDisplay *display; g_return_if_fail (event != NULL); if (event->any.window) display = gdk_drawable_get_display (event->any.window); else { GDK_NOTE (MULTIHEAD, g_message ("Falling back to default display for gdk_event_put()")); display = gdk_display_get_default (); } gdk_display_put_event (display, event); } static GHashTable *event_hash = NULL; /** * gdk_event_new: * @type: a #GdkEventType * * Creates a new event of the given type. All fields are set to 0. * * Return value: a newly-allocated #GdkEvent. The returned #GdkEvent * should be freed with gdk_event_free(). * * Since: 2.2 **/ GdkEvent* gdk_event_new (GdkEventType type) { GdkEventPrivate *new_private; GdkEvent *new_event; if (!event_hash) event_hash = g_hash_table_new (g_direct_hash, NULL); new_private = g_slice_new0 (GdkEventPrivate); new_private->flags = 0; new_private->screen = NULL; g_hash_table_insert (event_hash, new_private, GUINT_TO_POINTER (1)); new_event = (GdkEvent *) new_private; new_event->any.type = type; /* * Bytewise 0 initialization is reasonable for most of the * current event types. Explicitely initialize double fields * since I trust bytewise 0 == 0. less than for integers * or pointers. */ switch (type) { case GDK_MOTION_NOTIFY: new_event->motion.x = 0.; new_event->motion.y = 0.; new_event->motion.x_root = 0.; new_event->motion.y_root = 0.; break; case GDK_BUTTON_PRESS: case GDK_2BUTTON_PRESS: case GDK_3BUTTON_PRESS: case GDK_BUTTON_RELEASE: new_event->button.x = 0.; new_event->button.y = 0.; new_event->button.x_root = 0.; new_event->button.y_root = 0.; break; case GDK_SCROLL: new_event->scroll.x = 0.; new_event->scroll.y = 0.; new_event->scroll.x_root = 0.; new_event->scroll.y_root = 0.; break; case GDK_ENTER_NOTIFY: case GDK_LEAVE_NOTIFY: new_event->crossing.x = 0.; new_event->crossing.y = 0.; new_event->crossing.x_root = 0.; new_event->crossing.y_root = 0.; break; default: break; } return new_event; } static gboolean gdk_event_is_allocated (const GdkEvent *event) { if (event_hash) return g_hash_table_lookup (event_hash, event) != NULL; return FALSE; } /** * gdk_event_copy: * @event: a #GdkEvent * * Copies a #GdkEvent, copying or incrementing the reference count of the * resources associated with it (e.g. #GdkWindow's and strings). * * Return value: a copy of @event. The returned #GdkEvent should be freed with * gdk_event_free(). **/ GdkEvent* gdk_event_copy (const GdkEvent *event) { GdkEventPrivate *new_private; GdkEvent *new_event; g_return_val_if_fail (event != NULL, NULL); new_event = gdk_event_new (GDK_NOTHING); new_private = (GdkEventPrivate *)new_event; *new_event = *event; if (new_event->any.window) g_object_ref (new_event->any.window); if (gdk_event_is_allocated (event)) { GdkEventPrivate *private = (GdkEventPrivate *)event; new_private->screen = private->screen; new_private->device = private->device; } switch (event->any.type) { case GDK_KEY_PRESS: case GDK_KEY_RELEASE: new_event->key.string = g_strdup (event->key.string); break; case GDK_ENTER_NOTIFY: case GDK_LEAVE_NOTIFY: if (event->crossing.subwindow != NULL) g_object_ref (event->crossing.subwindow); break; case GDK_DRAG_ENTER: case GDK_DRAG_LEAVE: case GDK_DRAG_MOTION: case GDK_DRAG_STATUS: case GDK_DROP_START: case GDK_DROP_FINISHED: g_object_ref (event->dnd.context); break; case GDK_EXPOSE: case GDK_DAMAGE: if (event->expose.region) new_event->expose.region = cairo_region_copy (event->expose.region); break; case GDK_SETTING: new_event->setting.name = g_strdup (new_event->setting.name); break; case GDK_BUTTON_PRESS: case GDK_BUTTON_RELEASE: if (event->button.axes) new_event->button.axes = g_memdup (event->button.axes, sizeof (gdouble) * event->button.device->num_axes); break; case GDK_MOTION_NOTIFY: if (event->motion.axes) new_event->motion.axes = g_memdup (event->motion.axes, sizeof (gdouble) * event->motion.device->num_axes); break; default: break; } if (gdk_event_is_allocated (event)) _gdk_windowing_event_data_copy (event, new_event); return new_event; } /** * gdk_event_free: * @event: a #GdkEvent. * * 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_copy() * and gdk_event_new(). **/ void gdk_event_free (GdkEvent *event) { g_return_if_fail (event != NULL); if (event->any.window) g_object_unref (event->any.window); switch (event->any.type) { case GDK_KEY_PRESS: case GDK_KEY_RELEASE: g_free (event->key.string); break; case GDK_ENTER_NOTIFY: case GDK_LEAVE_NOTIFY: if (event->crossing.subwindow != NULL) g_object_unref (event->crossing.subwindow); break; case GDK_DRAG_ENTER: case GDK_DRAG_LEAVE: case GDK_DRAG_MOTION: case GDK_DRAG_STATUS: case GDK_DROP_START: case GDK_DROP_FINISHED: g_object_unref (event->dnd.context); break; case GDK_BUTTON_PRESS: case GDK_BUTTON_RELEASE: g_free (event->button.axes); break; case GDK_EXPOSE: case GDK_DAMAGE: if (event->expose.region) cairo_region_destroy (event->expose.region); break; case GDK_MOTION_NOTIFY: g_free (event->motion.axes); break; case GDK_SETTING: g_free (event->setting.name); break; default: break; } _gdk_windowing_event_data_free (event); g_hash_table_remove (event_hash, event); g_slice_free (GdkEventPrivate, (GdkEventPrivate*) event); } /** * gdk_event_get_time: * @event: a #GdkEvent * * Returns the time stamp from @event, if there is one; otherwise * returns #GDK_CURRENT_TIME. If @event is %NULL, returns #GDK_CURRENT_TIME. * * Return value: time stamp field from @event **/ guint32 gdk_event_get_time (const GdkEvent *event) { if (event) switch (event->type) { case GDK_MOTION_NOTIFY: return event->motion.time; case GDK_BUTTON_PRESS: case GDK_2BUTTON_PRESS: case GDK_3BUTTON_PRESS: case GDK_BUTTON_RELEASE: return event->button.time; case GDK_SCROLL: return event->scroll.time; case GDK_KEY_PRESS: case GDK_KEY_RELEASE: return event->key.time; case GDK_ENTER_NOTIFY: case GDK_LEAVE_NOTIFY: return event->crossing.time; case GDK_PROPERTY_NOTIFY: return event->property.time; case GDK_SELECTION_CLEAR: case GDK_SELECTION_REQUEST: case GDK_SELECTION_NOTIFY: return event->selection.time; case GDK_PROXIMITY_IN: case GDK_PROXIMITY_OUT: return event->proximity.time; case GDK_DRAG_ENTER: case GDK_DRAG_LEAVE: case GDK_DRAG_MOTION: case GDK_DRAG_STATUS: case GDK_DROP_START: case GDK_DROP_FINISHED: return event->dnd.time; case GDK_CLIENT_EVENT: case GDK_VISIBILITY_NOTIFY: case GDK_NO_EXPOSE: case GDK_CONFIGURE: case GDK_FOCUS_CHANGE: case GDK_NOTHING: case GDK_DAMAGE: case GDK_DELETE: case GDK_DESTROY: case GDK_EXPOSE: case GDK_MAP: case GDK_UNMAP: case GDK_WINDOW_STATE: case GDK_SETTING: case GDK_OWNER_CHANGE: case GDK_GRAB_BROKEN: case GDK_EVENT_LAST: /* return current time */ break; } return GDK_CURRENT_TIME; } /** * gdk_event_get_state: * @event: a #GdkEvent or NULL * @state: (out): return location for 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. * * Return value: %TRUE if there was a state field in the event **/ gboolean gdk_event_get_state (const GdkEvent *event, GdkModifierType *state) { g_return_val_if_fail (state != NULL, FALSE); if (event) switch (event->type) { case GDK_MOTION_NOTIFY: *state = event->motion.state; return TRUE; case GDK_BUTTON_PRESS: case GDK_2BUTTON_PRESS: case GDK_3BUTTON_PRESS: case GDK_BUTTON_RELEASE: *state = event->button.state; return TRUE; case GDK_SCROLL: *state = event->scroll.state; return TRUE; case GDK_KEY_PRESS: case GDK_KEY_RELEASE: *state = event->key.state; return TRUE; case GDK_ENTER_NOTIFY: case GDK_LEAVE_NOTIFY: *state = event->crossing.state; return TRUE; case GDK_PROPERTY_NOTIFY: *state = event->property.state; return TRUE; case GDK_VISIBILITY_NOTIFY: case GDK_CLIENT_EVENT: case GDK_NO_EXPOSE: case GDK_CONFIGURE: case GDK_FOCUS_CHANGE: case GDK_SELECTION_CLEAR: case GDK_SELECTION_REQUEST: case GDK_SELECTION_NOTIFY: case GDK_PROXIMITY_IN: case GDK_PROXIMITY_OUT: case GDK_DAMAGE: case GDK_DRAG_ENTER: case GDK_DRAG_LEAVE: case GDK_DRAG_MOTION: case GDK_DRAG_STATUS: case GDK_DROP_START: case GDK_DROP_FINISHED: case GDK_NOTHING: case GDK_DELETE: case GDK_DESTROY: case GDK_EXPOSE: case GDK_MAP: case GDK_UNMAP: case GDK_WINDOW_STATE: case GDK_SETTING: case GDK_OWNER_CHANGE: case GDK_GRAB_BROKEN: case GDK_EVENT_LAST: /* no state field */ break; } *state = 0; return FALSE; } /** * gdk_event_get_coords: * @event: a #GdkEvent * @x_win: (out): location to put event window x coordinate * @y_win: (out): location to put event window y coordinate * * Extract the event window relative x/y coordinates from an event. * * Return value: %TRUE if the event delivered event window coordinates **/ gboolean gdk_event_get_coords (const GdkEvent *event, gdouble *x_win, gdouble *y_win) { gdouble x = 0, y = 0; gboolean fetched = TRUE; g_return_val_if_fail (event != NULL, FALSE); switch (event->type) { case GDK_CONFIGURE: x = event->configure.x; y = event->configure.y; break; case GDK_ENTER_NOTIFY: case GDK_LEAVE_NOTIFY: x = event->crossing.x; y = event->crossing.y; break; case GDK_SCROLL: x = event->scroll.x; y = event->scroll.y; break; case GDK_BUTTON_PRESS: case GDK_2BUTTON_PRESS: case GDK_3BUTTON_PRESS: case GDK_BUTTON_RELEASE: x = event->button.x; y = event->button.y; break; case GDK_MOTION_NOTIFY: x = event->motion.x; y = event->motion.y; break; default: fetched = FALSE; break; } if (x_win) *x_win = x; if (y_win) *y_win = y; return fetched; } /** * gdk_event_get_root_coords: * @event: a #GdkEvent * @x_root: (out): location to put root window x coordinate * @y_root: (out): location to put root window y coordinate * * Extract the root window relative x/y coordinates from an event. * * Return value: %TRUE if the event delivered root window coordinates **/ gboolean gdk_event_get_root_coords (const GdkEvent *event, gdouble *x_root, gdouble *y_root) { gdouble x = 0, y = 0; gboolean fetched = TRUE; g_return_val_if_fail (event != NULL, FALSE); switch (event->type) { case GDK_MOTION_NOTIFY: x = event->motion.x_root; y = event->motion.y_root; break; case GDK_SCROLL: x = event->scroll.x_root; y = event->scroll.y_root; break; case GDK_BUTTON_PRESS: case GDK_2BUTTON_PRESS: case GDK_3BUTTON_PRESS: case GDK_BUTTON_RELEASE: x = event->button.x_root; y = event->button.y_root; break; case GDK_ENTER_NOTIFY: case GDK_LEAVE_NOTIFY: x = event->crossing.x_root; y = event->crossing.y_root; break; case GDK_DRAG_ENTER: case GDK_DRAG_LEAVE: case GDK_DRAG_MOTION: case GDK_DRAG_STATUS: case GDK_DROP_START: case GDK_DROP_FINISHED: x = event->dnd.x_root; y = event->dnd.y_root; break; default: fetched = FALSE; break; } if (x_root) *x_root = x; if (y_root) *y_root = y; return fetched; } /** * gdk_event_get_axis: * @event: a #GdkEvent * @axis_use: (out): the axis use to look for * @value: (out): location to store the value found * * Extract the axis value for a particular axis use from * an event structure. * * Return value: %TRUE if the specified axis was found, otherwise %FALSE **/ gboolean gdk_event_get_axis (const GdkEvent *event, GdkAxisUse axis_use, gdouble *value) { gdouble *axes; GdkDevice *device; g_return_val_if_fail (event != NULL, FALSE); if (axis_use == GDK_AXIS_X || axis_use == GDK_AXIS_Y) { gdouble x, y; switch (event->type) { case GDK_MOTION_NOTIFY: x = event->motion.x; y = event->motion.y; break; case GDK_SCROLL: x = event->scroll.x; y = event->scroll.y; break; case GDK_BUTTON_PRESS: case GDK_BUTTON_RELEASE: x = event->button.x; y = event->button.y; break; case GDK_ENTER_NOTIFY: case GDK_LEAVE_NOTIFY: x = event->crossing.x; y = event->crossing.y; break; default: return FALSE; } if (axis_use == GDK_AXIS_X && value) *value = x; if (axis_use == GDK_AXIS_Y && value) *value = y; return TRUE; } else if (event->type == GDK_BUTTON_PRESS || event->type == GDK_BUTTON_RELEASE) { device = event->button.device; axes = event->button.axes; } else if (event->type == GDK_MOTION_NOTIFY) { device = event->motion.device; axes = event->motion.axes; } else return FALSE; return gdk_device_get_axis (device, axes, axis_use, value); } /** * gdk_event_set_device: * @event: a #GdkEvent * @device: a #GdkDevice * * Sets the device for @event to @device. The event must * have been allocated by GTK+, for instance, by * gdk_event_copy(). * * Since: 3.0 **/ void gdk_event_set_device (GdkEvent *event, GdkDevice *device) { GdkEventPrivate *private; g_return_if_fail (gdk_event_is_allocated (event)); private = (GdkEventPrivate *) event; private->device = device; switch (event->type) { case GDK_MOTION_NOTIFY: event->motion.device = device; break; case GDK_BUTTON_PRESS: case GDK_2BUTTON_PRESS: case GDK_3BUTTON_PRESS: case GDK_BUTTON_RELEASE: event->button.device = device; break; case GDK_SCROLL: event->scroll.device = device; break; case GDK_PROXIMITY_IN: case GDK_PROXIMITY_OUT: event->proximity.device = device; break; default: break; } } /** * gdk_event_get_device: * @event: a #GdkEvent. * * If the event contains a "device" field, this function will return * it, else it will return %NULL. * * Returns: a #GdkDevice, or %NULL. * * Since: 3.0 **/ GdkDevice * gdk_event_get_device (const GdkEvent *event) { g_return_val_if_fail (event != NULL, NULL); if (gdk_event_is_allocated (event)) { GdkEventPrivate *private = (GdkEventPrivate *) event; if (private->device) return private->device; } switch (event->type) { case GDK_MOTION_NOTIFY: return event->motion.device; case GDK_BUTTON_PRESS: case GDK_2BUTTON_PRESS: case GDK_3BUTTON_PRESS: case GDK_BUTTON_RELEASE: return event->button.device; case GDK_SCROLL: return event->scroll.device; case GDK_PROXIMITY_IN: case GDK_PROXIMITY_OUT: return event->proximity.device; default: break; } /* Fallback if event has no device set */ switch (event->type) { case GDK_MOTION_NOTIFY: case GDK_BUTTON_PRESS: case GDK_2BUTTON_PRESS: case GDK_3BUTTON_PRESS: case GDK_BUTTON_RELEASE: case GDK_ENTER_NOTIFY: case GDK_LEAVE_NOTIFY: case GDK_FOCUS_CHANGE: case GDK_PROXIMITY_IN: case GDK_PROXIMITY_OUT: case GDK_DRAG_ENTER: case GDK_DRAG_LEAVE: case GDK_DRAG_MOTION: case GDK_DRAG_STATUS: case GDK_DROP_START: case GDK_DROP_FINISHED: case GDK_SCROLL: case GDK_GRAB_BROKEN: case GDK_KEY_PRESS: case GDK_KEY_RELEASE: { GdkDisplay *display; GdkDevice *core_pointer; g_warning ("Event with type %d not holding a GdkDevice. " "It is most likely synthesized outside Gdk/GTK+\n", event->type); display = gdk_drawable_get_display (event->any.window); core_pointer = gdk_display_get_core_pointer (display); if (event->type == GDK_KEY_PRESS || event->type == GDK_KEY_RELEASE) return gdk_device_get_associated_device (core_pointer); else return core_pointer; } break; default: return NULL; } } /** * gdk_event_request_motions: * @event: a valid #GdkEvent * * 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: * * |[ * { * /* 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 **/ void gdk_event_request_motions (const GdkEventMotion *event) { GdkDisplay *display; g_return_if_fail (event != NULL); if (event->type == GDK_MOTION_NOTIFY && event->is_hint) { gdk_device_get_state (event->device, event->window, NULL, NULL); display = gdk_drawable_get_display (event->window); _gdk_display_enable_motion_hints (display, event->device); } } static gboolean gdk_events_get_axis_distances (GdkEvent *event1, GdkEvent *event2, gdouble *x_distance, gdouble *y_distance, gdouble *distance) { gdouble x1, x2, y1, y2; gdouble xd, yd; if (!gdk_event_get_coords (event1, &x1, &y1) || !gdk_event_get_coords (event2, &x2, &y2)) return FALSE; xd = x2 - x1; yd = y2 - y1; if (x_distance) *x_distance = xd; if (y_distance) *y_distance = yd; if (distance) *distance = sqrt ((xd * xd) + (yd * yd)); return TRUE; } /** * gdk_events_get_distance: * @event1: first #GdkEvent * @event2: second #GdkEvent * @distance: return location for the distance * * If both events have X/Y information, the distance between both coordinates * (as in a straight line going from @event1 to @event2) will be returned. * * Returns: %TRUE if the distance could be calculated. * * Since: 3.0 **/ gboolean gdk_events_get_distance (GdkEvent *event1, GdkEvent *event2, gdouble *distance) { return gdk_events_get_axis_distances (event1, event2, NULL, NULL, distance); } /** * gdk_events_get_angle: * @event1: first #GdkEvent * @event2: second #GdkEvent * @angle: return location for the relative angle between both events * * If both events contain X/Y information, this function will return %TRUE * and return in @angle the relative angle from @event1 to @event2. The rotation * direction for positive angles is from the positive X axis towards the positive * Y axis. * * Returns: %TRUE if the angle could be calculated. * * Since: 3.0 **/ gboolean gdk_events_get_angle (GdkEvent *event1, GdkEvent *event2, gdouble *angle) { gdouble x_distance, y_distance, distance; if (!gdk_events_get_axis_distances (event1, event2, &x_distance, &y_distance, &distance)) return FALSE; if (angle) { *angle = atan2 (x_distance, y_distance); /* Invert angle */ *angle = (2 * G_PI) - *angle; /* Shift it 90° */ *angle += G_PI / 2; /* And constraint it to 0°-360° */ *angle = fmod (*angle, 2 * G_PI); } return TRUE; } /** * gdk_events_get_center: * @event1: first #GdkEvent * @event2: second #GdkEvent * @x: (out): return location for the X coordinate of the center * @y: (out): return location for the Y coordinate of the center * * If both events contain X/Y information, the center of both coordinates * will be returned in @x and @y. * * Returns: %TRUE if the center could be calculated. * * Since: 3.0 **/ gboolean gdk_events_get_center (GdkEvent *event1, GdkEvent *event2, gdouble *x, gdouble *y) { gdouble x1, x2, y1, y2; if (!gdk_event_get_coords (event1, &x1, &y1) || !gdk_event_get_coords (event2, &x2, &y2)) return FALSE; if (x) *x = (x2 + x1) / 2; if (y) *y = (y2 + y1) / 2; return TRUE; } /** * gdk_event_set_screen: * @event: a #GdkEvent * @screen: a #GdkScreen * * Sets the screen for @event to @screen. The event must * have been allocated by GTK+, for instance, by * gdk_event_copy(). * * Since: 2.2 **/ void gdk_event_set_screen (GdkEvent *event, GdkScreen *screen) { GdkEventPrivate *private; g_return_if_fail (gdk_event_is_allocated (event)); private = (GdkEventPrivate *)event; private->screen = screen; } /** * gdk_event_get_screen: * @event: a #GdkEvent * * 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. * * Return value: the screen for the event * * Since: 2.2 **/ GdkScreen * gdk_event_get_screen (const GdkEvent *event) { if (gdk_event_is_allocated (event)) { GdkEventPrivate *private = (GdkEventPrivate *)event; if (private->screen) return private->screen; } if (event->any.window) return gdk_drawable_get_screen (event->any.window); return NULL; } /** * gdk_set_show_events: * @show_events: %TRUE to output event debugging information. * * Sets whether a trace of received events is output. * Note that GTK+ must be compiled with debugging (that is, * configured using the option) * to use this option. **/ void gdk_set_show_events (gboolean show_events) { if (show_events) _gdk_debug_flags |= GDK_DEBUG_EVENTS; else _gdk_debug_flags &= ~GDK_DEBUG_EVENTS; } /** * gdk_get_show_events: * * Gets whether event debugging output is enabled. * * Return value: %TRUE if event debugging output is enabled. **/ gboolean gdk_get_show_events (void) { return (_gdk_debug_flags & GDK_DEBUG_EVENTS) != 0; } /* What do we do with G_IO_NVAL? */ #define READ_CONDITION (G_IO_IN | G_IO_HUP | G_IO_ERR) #define WRITE_CONDITION (G_IO_OUT | G_IO_ERR) #define EXCEPTION_CONDITION (G_IO_PRI) static void gdk_synthesize_click (GdkDisplay *display, GdkEvent *event, gint nclicks) { GdkEvent temp_event; GdkEvent *event_copy; GList *link; g_return_if_fail (event != NULL); temp_event = *event; temp_event.type = (nclicks == 2) ? GDK_2BUTTON_PRESS : GDK_3BUTTON_PRESS; event_copy = gdk_event_copy (&temp_event); link = _gdk_event_queue_append (display, event_copy); } void _gdk_event_button_generate (GdkDisplay *display, GdkEvent *event) { GdkMultipleClickInfo *info; info = g_hash_table_lookup (display->multiple_click_info, event->button.device); if (G_UNLIKELY (!info)) { info = g_new0 (GdkMultipleClickInfo, 1); info->button_number[0] = info->button_number[1] = -1; g_hash_table_insert (display->multiple_click_info, event->button.device, info); } if ((event->button.time < (info->button_click_time[1] + 2 * display->double_click_time)) && (event->button.window == info->button_window[1]) && (event->button.button == info->button_number[1]) && (ABS (event->button.x - info->button_x[1]) <= display->double_click_distance) && (ABS (event->button.y - info->button_y[1]) <= display->double_click_distance)) { gdk_synthesize_click (display, event, 3); info->button_click_time[1] = 0; info->button_click_time[0] = 0; info->button_window[1] = NULL; info->button_window[0] = NULL; info->button_number[1] = -1; info->button_number[0] = -1; info->button_x[0] = info->button_x[1] = 0; info->button_y[0] = info->button_y[1] = 0; } else if ((event->button.time < (info->button_click_time[0] + display->double_click_time)) && (event->button.window == info->button_window[0]) && (event->button.button == info->button_number[0]) && (ABS (event->button.x - info->button_x[0]) <= display->double_click_distance) && (ABS (event->button.y - info->button_y[0]) <= display->double_click_distance)) { gdk_synthesize_click (display, event, 2); info->button_click_time[1] = info->button_click_time[0]; info->button_click_time[0] = event->button.time; info->button_window[1] = info->button_window[0]; info->button_window[0] = event->button.window; info->button_number[1] = info->button_number[0]; info->button_number[0] = event->button.button; info->button_x[1] = info->button_x[0]; info->button_x[0] = event->button.x; info->button_y[1] = info->button_y[0]; info->button_y[0] = event->button.y; } else { info->button_click_time[1] = 0; info->button_click_time[0] = event->button.time; info->button_window[1] = NULL; info->button_window[0] = event->button.window; info->button_number[1] = -1; info->button_number[0] = event->button.button; info->button_x[1] = 0; info->button_x[0] = event->button.x; info->button_y[1] = 0; info->button_y[0] = event->button.y; } } void gdk_synthesize_window_state (GdkWindow *window, GdkWindowState unset_flags, GdkWindowState set_flags) { GdkEvent temp_event; GdkWindowState old; g_return_if_fail (window != NULL); temp_event.window_state.window = window; temp_event.window_state.type = GDK_WINDOW_STATE; temp_event.window_state.send_event = FALSE; old = ((GdkWindowObject*) temp_event.window_state.window)->state; temp_event.window_state.new_window_state = old; temp_event.window_state.new_window_state |= set_flags; temp_event.window_state.new_window_state &= ~unset_flags; temp_event.window_state.changed_mask = temp_event.window_state.new_window_state ^ old; if (temp_event.window_state.new_window_state == old) return; /* No actual work to do, nothing changed. */ /* Actually update the field in GdkWindow, this is sort of an odd * place to do it, but seems like the safest since it ensures we expose no * inconsistent state to the user. */ ((GdkWindowObject*) window)->state = temp_event.window_state.new_window_state; if (temp_event.window_state.changed_mask & GDK_WINDOW_STATE_WITHDRAWN) _gdk_window_update_viewable (window); /* We only really send the event to toplevels, since * all the window states don't apply to non-toplevels. * Non-toplevels do use the GDK_WINDOW_STATE_WITHDRAWN flag * internally so we needed to update window->state. */ switch (((GdkWindowObject*) window)->window_type) { case GDK_WINDOW_TOPLEVEL: case GDK_WINDOW_TEMP: /* ? */ gdk_display_put_event (gdk_drawable_get_display (window), &temp_event); break; case GDK_WINDOW_FOREIGN: case GDK_WINDOW_ROOT: case GDK_WINDOW_CHILD: break; } } /** * gdk_display_set_double_click_time: * @display: a #GdkDisplay * @msec: double click time in milliseconds (thousandths of a second) * * Sets the double click time (two clicks within this time interval * count as a double click and result in a #GDK_2BUTTON_PRESS event). * Applications should not set this, it is a global * user-configured setting. * * Since: 2.2 **/ void gdk_display_set_double_click_time (GdkDisplay *display, guint msec) { display->double_click_time = msec; } /** * gdk_set_double_click_time: * @msec: double click time in milliseconds (thousandths of a second) * * Set the double click time for the default display. See * gdk_display_set_double_click_time(). * See also gdk_display_set_double_click_distance(). * Applications should not set this, it is a * global user-configured setting. **/ void gdk_set_double_click_time (guint msec) { gdk_display_set_double_click_time (gdk_display_get_default (), msec); } /** * gdk_display_set_double_click_distance: * @display: a #GdkDisplay * @distance: distance in pixels * * Sets the double click distance (two clicks within this distance * count as a double click and result in a #GDK_2BUTTON_PRESS event). * See also gdk_display_set_double_click_time(). * Applications should not set this, it is a global * user-configured setting. * * Since: 2.4 **/ void gdk_display_set_double_click_distance (GdkDisplay *display, guint distance) { display->double_click_distance = distance; } G_DEFINE_BOXED_TYPE (GdkEvent, gdk_event, gdk_event_copy, gdk_event_free) /** * gdk_setting_get: * @name: the name of the setting. * @value: location to store the value of the setting. * * Obtains a desktop-wide setting, such as the double-click time, * for the default screen. See gdk_screen_get_setting(). * * Returns: %TRUE if the setting existed and a value was stored * in @value, %FALSE otherwise. **/ gboolean gdk_setting_get (const gchar *name, GValue *value) { return gdk_screen_get_setting (gdk_screen_get_default (), name, value); }