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gtk/gdk/gdkevents.c
Steve Frécinaux d3adde0116 [gdkevents] Add annotations for GdkEvent getters.
2010-06-08 00:05:58 +02:00

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/* 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 <string.h> /* For memset() */
#include "gdk.h"
#include "gdkinternals.h"
#include "gdkalias.h"
typedef struct _GdkIOClosure GdkIOClosure;
struct _GdkIOClosure
{
GdkInputFunction function;
GdkInputCondition condition;
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;
}
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 = gdk_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_get_graphics_expose() and 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)
gdk_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_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:
*
* |[
* {
* /&ast; motion_event handler &ast;/
* x = motion_event->x;
* y = motion_event->y;
* /&ast; handle (x,y) motion &ast;/
* gdk_event_request_motions (motion_event); /&ast; handles is_hint events &ast;/
* }
* ]|
*
* 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);
}
}
/**
* 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 <literal>event->any.window</literal>, 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 <literal>event->motion.x_root</literal> and
* <literal>event->motion.y_root</literal> 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>--enable-debug</option> 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;
}
static void
gdk_io_destroy (gpointer data)
{
GdkIOClosure *closure = data;
if (closure->notify)
closure->notify (closure->data);
g_free (closure);
}
/* 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 gboolean
gdk_io_invoke (GIOChannel *source,
GIOCondition condition,
gpointer data)
{
GdkIOClosure *closure = data;
GdkInputCondition gdk_cond = 0;
if (condition & READ_CONDITION)
gdk_cond |= GDK_INPUT_READ;
if (condition & WRITE_CONDITION)
gdk_cond |= GDK_INPUT_WRITE;
if (condition & EXCEPTION_CONDITION)
gdk_cond |= GDK_INPUT_EXCEPTION;
if (closure->condition & gdk_cond)
closure->function (closure->data, g_io_channel_unix_get_fd (source), gdk_cond);
return TRUE;
}
/**
* gdk_input_add_full:
* @source: a file descriptor.
* @condition: the condition.
* @function: the callback function.
* @data: callback data passed to @function.
* @destroy: callback function to call with @data when the input
* handler is removed.
*
* Establish a callback when a condition becomes true on
* a file descriptor.
*
* Returns: a tag that can later be used as an argument to
* gdk_input_remove().
*
* Deprecated: 2.14: Use g_io_add_watch_full() on a #GIOChannel
*/
gint
gdk_input_add_full (gint source,
GdkInputCondition condition,
GdkInputFunction function,
gpointer data,
GDestroyNotify destroy)
{
guint result;
GdkIOClosure *closure = g_new (GdkIOClosure, 1);
GIOChannel *channel;
GIOCondition cond = 0;
closure->function = function;
closure->condition = condition;
closure->notify = destroy;
closure->data = data;
if (condition & GDK_INPUT_READ)
cond |= READ_CONDITION;
if (condition & GDK_INPUT_WRITE)
cond |= WRITE_CONDITION;
if (condition & GDK_INPUT_EXCEPTION)
cond |= EXCEPTION_CONDITION;
channel = g_io_channel_unix_new (source);
result = g_io_add_watch_full (channel, G_PRIORITY_DEFAULT, cond,
gdk_io_invoke,
closure, gdk_io_destroy);
g_io_channel_unref (channel);
return result;
}
/**
* gdk_input_add:
* @source: a file descriptor.
* @condition: the condition.
* @function: the callback function.
* @data: callback data passed to @function.
*
* Establish a callback when a condition becomes true on
* a file descriptor.
*
* Returns: a tag that can later be used as an argument to
* gdk_input_remove().
*
* Deprecated: 2.14: Use g_io_add_watch() on a #GIOChannel
*/
gint
gdk_input_add (gint source,
GdkInputCondition condition,
GdkInputFunction function,
gpointer data)
{
return gdk_input_add_full (source, condition, function, data, NULL);
}
void
gdk_input_remove (gint tag)
{
g_source_remove (tag);
}
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)
{
if ((event->button.time < (display->button_click_time[1] + 2*display->double_click_time)) &&
(event->button.window == display->button_window[1]) &&
(event->button.button == display->button_number[1]) &&
(ABS (event->button.x - display->button_x[1]) <= display->double_click_distance) &&
(ABS (event->button.y - display->button_y[1]) <= display->double_click_distance))
{
gdk_synthesize_click (display, event, 3);
display->button_click_time[1] = 0;
display->button_click_time[0] = 0;
display->button_window[1] = NULL;
display->button_window[0] = NULL;
display->button_number[1] = -1;
display->button_number[0] = -1;
display->button_x[0] = display->button_x[1] = 0;
display->button_y[0] = display->button_y[1] = 0;
}
else if ((event->button.time < (display->button_click_time[0] + display->double_click_time)) &&
(event->button.window == display->button_window[0]) &&
(event->button.button == display->button_number[0]) &&
(ABS (event->button.x - display->button_x[0]) <= display->double_click_distance) &&
(ABS (event->button.y - display->button_y[0]) <= display->double_click_distance))
{
gdk_synthesize_click (display, event, 2);
display->button_click_time[1] = display->button_click_time[0];
display->button_click_time[0] = event->button.time;
display->button_window[1] = display->button_window[0];
display->button_window[0] = event->button.window;
display->button_number[1] = display->button_number[0];
display->button_number[0] = event->button.button;
display->button_x[1] = display->button_x[0];
display->button_x[0] = event->button.x;
display->button_y[1] = display->button_y[0];
display->button_y[0] = event->button.y;
}
else
{
display->button_click_time[1] = 0;
display->button_click_time[0] = event->button.time;
display->button_window[1] = NULL;
display->button_window[0] = event->button.window;
display->button_number[1] = -1;
display->button_number[0] = event->button.button;
display->button_x[1] = 0;
display->button_x[0] = event->button.x;
display->button_y[1] = 0;
display->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_DIALOG:
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 <emphasis>not</emphasis> 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 <emphasis>not</emphasis> 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 <emphasis>not</emphasis> 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;
}
GType
gdk_event_get_type (void)
{
static GType our_type = 0;
if (our_type == 0)
our_type = g_boxed_type_register_static (g_intern_static_string ("GdkEvent"),
(GBoxedCopyFunc)gdk_event_copy,
(GBoxedFreeFunc)gdk_event_free);
return our_type;
}
/**
* 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);
}
#define __GDK_EVENTS_C__
#include "gdkaliasdef.c"
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