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mutter/clutter/clutter-event.c
Emanuele Aina cea8ea06f3 events: Make _clutter_process_event() reentrant 
The _clutter_process_event() function may get called while already
servicing a _clutter_process_event() invocation (eg. when generating
ENTER events before emitting TOUCH_BEGIN).

In these cases clutter_get_current_event() would return NULL after
the inner call to _clutter_process_event() has finished, thereafter
making the current event inaccessible during the remaining portion
of the outer event emission.

By stacking the current events in ClutterMainContext instead of
simply replacing them we do not lose track of the real current event.

Also update clutter_get_current_event_time() to be consistent from a
reentrancy perspective.

https://bugzilla.gnome.org/show_bug.cgi?id=688457
2012-12-18 01:27:32 +00:00

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/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Authored By Matthew Allum <mallum@openedhand.com>
*
* Copyright (C) 2006 OpenedHand
*
* 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, see <http://www.gnu.org/licenses/>.
*
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "clutter-backend-private.h"
#include "clutter-debug.h"
#include "clutter-event-private.h"
#include "clutter-keysyms.h"
#include "clutter-private.h"
#include <math.h>
/**
* SECTION:clutter-event
* @short_description: User and window system events
*
* Windowing events handled by Clutter.
*
* The events usually come from the windowing backend, but can also
* be synthesized by Clutter itself or by the application code.
*/
typedef struct _ClutterEventPrivate {
ClutterEvent base;
ClutterInputDevice *device;
ClutterInputDevice *source_device;
gdouble delta_x;
gdouble delta_y;
gpointer platform_data;
guint is_pointer_emulated : 1;
} ClutterEventPrivate;
static GHashTable *all_events = NULL;
G_DEFINE_BOXED_TYPE (ClutterEvent, clutter_event,
clutter_event_copy,
clutter_event_free);
static gboolean
is_event_allocated (const ClutterEvent *event)
{
if (all_events == NULL)
return FALSE;
return g_hash_table_lookup (all_events, event) != NULL;
}
/*
* _clutter_event_get_platform_data:
* @event: a #ClutterEvent
*
* Retrieves the pointer to platform-specific data inside an event
*
* Return value: a pointer to platform-specific data
*
* Since: 1.4
*/
gpointer
_clutter_event_get_platform_data (const ClutterEvent *event)
{
if (!is_event_allocated (event))
return NULL;
return ((ClutterEventPrivate *) event)->platform_data;
}
/*< private >
* _clutter_event_set_platform_data:
* @event: a #ClutterEvent
* @data: a pointer to platform-specific data
*
* Sets the pointer to platform-specific data inside an event
*
* Since: 1.4
*/
void
_clutter_event_set_platform_data (ClutterEvent *event,
gpointer data)
{
if (!is_event_allocated (event))
return;
((ClutterEventPrivate *) event)->platform_data = data;
}
void
_clutter_event_set_pointer_emulated (ClutterEvent *event,
gboolean is_emulated)
{
if (!is_event_allocated (event))
return;
((ClutterEventPrivate *) event)->is_pointer_emulated = !!is_emulated;
}
/**
* clutter_event_type:
* @event: a #ClutterEvent
*
* Retrieves the type of the event.
*
* Return value: a #ClutterEventType
*/
ClutterEventType
clutter_event_type (const ClutterEvent *event)
{
g_return_val_if_fail (event != NULL, CLUTTER_NOTHING);
return event->type;
}
/**
* clutter_event_get_time:
* @event: a #ClutterEvent
*
* Retrieves the time of the event.
*
* Return value: the time of the event, or %CLUTTER_CURRENT_TIME
*
* Since: 0.4
*/
guint32
clutter_event_get_time (const ClutterEvent *event)
{
g_return_val_if_fail (event != NULL, CLUTTER_CURRENT_TIME);
return event->any.time;
}
/**
* clutter_event_set_time:
* @event: a #ClutterEvent
* @time_: the time of the event
*
* Sets the time of the event.
*
* Since: 1.8
*/
void
clutter_event_set_time (ClutterEvent *event,
guint32 time_)
{
g_return_if_fail (event != NULL);
event->any.time = time_;
}
/**
* clutter_event_get_state:
* @event: a #ClutterEvent
*
* Retrieves the modifier state of the event.
*
* Return value: the modifier state parameter, or 0
*
* Since: 0.4
*/
ClutterModifierType
clutter_event_get_state (const ClutterEvent *event)
{
g_return_val_if_fail (event != NULL, 0);
switch (event->type)
{
case CLUTTER_KEY_PRESS:
case CLUTTER_KEY_RELEASE:
return event->key.modifier_state;
case CLUTTER_BUTTON_PRESS:
case CLUTTER_BUTTON_RELEASE:
return event->button.modifier_state;
case CLUTTER_TOUCH_BEGIN:
case CLUTTER_TOUCH_UPDATE:
case CLUTTER_TOUCH_END:
case CLUTTER_TOUCH_CANCEL:
return event->touch.modifier_state;
case CLUTTER_MOTION:
return event->motion.modifier_state;
case CLUTTER_SCROLL:
return event->scroll.modifier_state;
default:
break;
}
return 0;
}
/**
* clutter_event_set_state:
* @event: a #ClutterEvent
* @state: the modifier state to set
*
* Sets the modifier state of the event.
*
* Since: 1.8
*/
void
clutter_event_set_state (ClutterEvent *event,
ClutterModifierType state)
{
g_return_if_fail (event != NULL);
switch (event->type)
{
case CLUTTER_KEY_PRESS:
case CLUTTER_KEY_RELEASE:
event->key.modifier_state = state;
break;
case CLUTTER_BUTTON_PRESS:
case CLUTTER_BUTTON_RELEASE:
event->button.modifier_state = state;
break;
case CLUTTER_MOTION:
event->motion.modifier_state = state;
break;
case CLUTTER_TOUCH_BEGIN:
case CLUTTER_TOUCH_UPDATE:
case CLUTTER_TOUCH_END:
case CLUTTER_TOUCH_CANCEL:
event->touch.modifier_state = state;
break;
case CLUTTER_SCROLL:
event->scroll.modifier_state = state;
break;
default:
break;
}
}
/**
* clutter_event_get_coords:
* @event: a #ClutterEvent
* @x: (out): return location for the X coordinate, or %NULL
* @y: (out): return location for the Y coordinate, or %NULL
*
* Retrieves the coordinates of @event and puts them into @x and @y.
*
* Since: 0.4
*/
void
clutter_event_get_coords (const ClutterEvent *event,
gfloat *x,
gfloat *y)
{
ClutterPoint coords;
g_return_if_fail (event != NULL);
clutter_event_get_position (event, &coords);
if (x != NULL)
*x = coords.x;
if (y != NULL)
*y = coords.y;
}
/**
* clutter_event_get_position:
* @event: a #ClutterEvent
* @position: a #ClutterPoint
*
* Retrieves the event coordinates as a #ClutterPoint.
*
* Since: 1.12
*/
void
clutter_event_get_position (const ClutterEvent *event,
ClutterPoint *position)
{
g_return_if_fail (event != NULL);
g_return_if_fail (position != NULL);
switch (event->type)
{
case CLUTTER_NOTHING:
case CLUTTER_KEY_PRESS:
case CLUTTER_KEY_RELEASE:
case CLUTTER_STAGE_STATE:
case CLUTTER_DESTROY_NOTIFY:
case CLUTTER_CLIENT_MESSAGE:
case CLUTTER_DELETE:
case CLUTTER_EVENT_LAST:
clutter_point_init (position, 0.f, 0.f);
break;
case CLUTTER_ENTER:
case CLUTTER_LEAVE:
clutter_point_init (position, event->crossing.x, event->crossing.y);
break;
case CLUTTER_BUTTON_PRESS:
case CLUTTER_BUTTON_RELEASE:
clutter_point_init (position, event->button.x, event->button.y);
break;
case CLUTTER_MOTION:
clutter_point_init (position, event->motion.x, event->motion.y);
break;
case CLUTTER_TOUCH_BEGIN:
case CLUTTER_TOUCH_UPDATE:
case CLUTTER_TOUCH_END:
case CLUTTER_TOUCH_CANCEL:
clutter_point_init (position, event->touch.x, event->touch.y);
break;
case CLUTTER_SCROLL:
clutter_point_init (position, event->scroll.x, event->scroll.y);
break;
}
}
/**
* clutter_event_set_coords:
* @event: a #ClutterEvent
* @x: the X coordinate of the event
* @y: the Y coordinate of the event
*
* Sets the coordinates of the @event.
*
* Since: 1.8
*/
void
clutter_event_set_coords (ClutterEvent *event,
gfloat x,
gfloat y)
{
g_return_if_fail (event != NULL);
switch (event->type)
{
case CLUTTER_NOTHING:
case CLUTTER_KEY_PRESS:
case CLUTTER_KEY_RELEASE:
case CLUTTER_STAGE_STATE:
case CLUTTER_DESTROY_NOTIFY:
case CLUTTER_CLIENT_MESSAGE:
case CLUTTER_DELETE:
case CLUTTER_EVENT_LAST:
break;
case CLUTTER_ENTER:
case CLUTTER_LEAVE:
event->crossing.x = x;
event->crossing.y = y;
break;
case CLUTTER_BUTTON_PRESS:
case CLUTTER_BUTTON_RELEASE:
event->button.x = x;
event->button.y = y;
break;
case CLUTTER_MOTION:
event->motion.x = x;
event->motion.y = y;
break;
case CLUTTER_TOUCH_BEGIN:
case CLUTTER_TOUCH_UPDATE:
case CLUTTER_TOUCH_END:
case CLUTTER_TOUCH_CANCEL:
event->touch.x = x;
event->touch.y = y;
break;
case CLUTTER_SCROLL:
event->scroll.x = x;
event->scroll.y = y;
break;
}
}
/**
* clutter_event_get_source:
* @event: a #ClutterEvent
*
* Retrieves the source #ClutterActor the event originated from, or
* NULL if the event has no source.
*
* Return value: (transfer none): a #ClutterActor
*
* Since: 0.6
*/
ClutterActor *
clutter_event_get_source (const ClutterEvent *event)
{
g_return_val_if_fail (event != NULL, NULL);
return event->any.source;
}
/**
* clutter_event_set_source:
* @event: a #ClutterEvent
* @actor: (allow-none): a #ClutterActor, or %NULL
*
* Sets the source #ClutterActor of @event.
*
* Since: 1.8
*/
void
clutter_event_set_source (ClutterEvent *event,
ClutterActor *actor)
{
g_return_if_fail (event != NULL);
g_return_if_fail (actor == NULL || CLUTTER_IS_ACTOR (actor));
event->any.source = actor;
}
/**
* clutter_event_get_stage:
* @event: a #ClutterEvent
*
* Retrieves the source #ClutterStage the event originated for, or
* %NULL if the event has no stage.
*
* Return value: (transfer none): a #ClutterStage
*
* Since: 0.8
*/
ClutterStage *
clutter_event_get_stage (const ClutterEvent *event)
{
g_return_val_if_fail (event != NULL, NULL);
return event->any.stage;
}
/**
* clutter_event_set_stage:
* @event: a #ClutterEvent
* @stage: (allow-none): a #ClutterStage, or %NULL
*
* Sets the source #ClutterStage of the event.
*
* Since: 1.8
*/
void
clutter_event_set_stage (ClutterEvent *event,
ClutterStage *stage)
{
g_return_if_fail (event != NULL);
g_return_if_fail (stage == NULL || CLUTTER_IS_STAGE (stage));
if (event->any.stage == stage)
return;
event->any.stage = stage;
}
/**
* clutter_event_get_flags:
* @event: a #ClutterEvent
*
* Retrieves the #ClutterEventFlags of @event
*
* Return value: the event flags
*
* Since: 1.0
*/
ClutterEventFlags
clutter_event_get_flags (const ClutterEvent *event)
{
g_return_val_if_fail (event != NULL, CLUTTER_EVENT_NONE);
return event->any.flags;
}
/**
* clutter_event_set_flags:
* @event: a #ClutterEvent
* @flags: a binary OR of #ClutterEventFlags values
*
* Sets the #ClutterEventFlags of @event
*
* Since: 1.8
*/
void
clutter_event_set_flags (ClutterEvent *event,
ClutterEventFlags flags)
{
g_return_if_fail (event != NULL);
if (event->any.flags == flags)
return;
event->any.flags = flags;
event->any.flags |= CLUTTER_EVENT_FLAG_SYNTHETIC;
}
/**
* clutter_event_get_related:
* @event: a #ClutterEvent of type %CLUTTER_ENTER or of
* type %CLUTTER_LEAVE
*
* Retrieves the related actor of a crossing event.
*
* Return value: (transfer none): the related #ClutterActor, or %NULL
*
* Since: 1.0
*/
ClutterActor *
clutter_event_get_related (const ClutterEvent *event)
{
g_return_val_if_fail (event != NULL, NULL);
g_return_val_if_fail (event->type == CLUTTER_ENTER ||
event->type == CLUTTER_LEAVE, NULL);
return event->crossing.related;
}
/**
* clutter_event_set_related:
* @event: a #ClutterEvent of type %CLUTTER_ENTER or %CLUTTER_LEAVE
* @actor: (allow-none): a #ClutterActor or %NULL
*
* Sets the related actor of a crossing event
*
* Since: 1.8
*/
void
clutter_event_set_related (ClutterEvent *event,
ClutterActor *actor)
{
g_return_if_fail (event != NULL);
g_return_if_fail (event->type == CLUTTER_ENTER ||
event->type == CLUTTER_LEAVE);
g_return_if_fail (actor == NULL || CLUTTER_IS_ACTOR (actor));
if (event->crossing.related == actor)
return;
event->crossing.related = actor;
}
/**
* clutter_event_set_scroll_delta:
* @event: a #ClutterEvent of type %CLUTTER_SCROLL
* @dx: delta on the horizontal axis
* @dy: delta on the vertical axis
*
* Sets the precise scrolling information of @event.
*
* Since: 1.10
*/
void
clutter_event_set_scroll_delta (ClutterEvent *event,
gdouble dx,
gdouble dy)
{
g_return_if_fail (event != NULL);
g_return_if_fail (event->type == CLUTTER_SCROLL);
if (!is_event_allocated (event))
return;
event->scroll.direction = CLUTTER_SCROLL_SMOOTH;
((ClutterEventPrivate *) event)->delta_x = dx;
((ClutterEventPrivate *) event)->delta_y = dy;
}
/**
* clutter_event_get_scroll_delta:
* @event: a #ClutterEvent of type %CLUTTER_SCROLL
* @dx: (out): return location for the delta on the horizontal axis
* @dy: (out): return location for the delta on the vertical axis
*
* Retrieves the precise scrolling information of @event.
*
* The @event has to have a #ClutterScrollEvent.direction value
* of %CLUTTER_SCROLL_SMOOTH.
*
* Since: 1.10
*/
void
clutter_event_get_scroll_delta (const ClutterEvent *event,
gdouble *dx,
gdouble *dy)
{
gdouble delta_x, delta_y;
g_return_if_fail (event != NULL);
g_return_if_fail (event->type == CLUTTER_SCROLL);
g_return_if_fail (event->scroll.direction == CLUTTER_SCROLL_SMOOTH);
delta_x = delta_y = 0;
if (is_event_allocated (event))
{
delta_x = ((ClutterEventPrivate *) event)->delta_x;
delta_y = ((ClutterEventPrivate *) event)->delta_y;
}
if (dx != NULL)
*dx = delta_x;
if (dy != NULL)
*dy = delta_y;
}
/**
* clutter_event_get_scroll_direction:
* @event: a #ClutterEvent of type %CLUTTER_SCROLL
*
* Retrieves the direction of the scrolling of @event
*
* Return value: the scrolling direction
*
* Since: 1.0
*/
ClutterScrollDirection
clutter_event_get_scroll_direction (const ClutterEvent *event)
{
g_return_val_if_fail (event != NULL, CLUTTER_SCROLL_UP);
g_return_val_if_fail (event->type == CLUTTER_SCROLL, CLUTTER_SCROLL_UP);
return event->scroll.direction;
}
/**
* clutter_event_set_scroll_direction:
* @event: a #ClutterEvent
* @direction: the scrolling direction
*
* Sets the direction of the scrolling of @event
*
* Since: 1.8
*/
void
clutter_event_set_scroll_direction (ClutterEvent *event,
ClutterScrollDirection direction)
{
g_return_if_fail (event != NULL);
g_return_if_fail (event->type == CLUTTER_SCROLL);
event->scroll.direction = direction;
}
/**
* clutter_event_get_button:
* @event: a #ClutterEvent of type %CLUTTER_BUTTON_PRESS or
* of type %CLUTTER_BUTTON_RELEASE
*
* Retrieves the button number of @event
*
* Return value: the button number
*
* Since: 1.0
*/
guint32
clutter_event_get_button (const ClutterEvent *event)
{
g_return_val_if_fail (event != NULL, 0);
g_return_val_if_fail (event->type == CLUTTER_BUTTON_PRESS ||
event->type == CLUTTER_BUTTON_RELEASE, 0);
return event->button.button;
}
/**
* clutter_event_set_button:
* @event: a #ClutterEvent or type %CLUTTER_BUTTON_PRESS or
* of type %CLUTTER_BUTTON_RELEASE
* @button: the button number
*
* Sets the button number of @event
*
* Since: 1.8
*/
void
clutter_event_set_button (ClutterEvent *event,
guint32 button)
{
g_return_if_fail (event != NULL);
g_return_if_fail (event->type == CLUTTER_BUTTON_PRESS ||
event->type == CLUTTER_BUTTON_RELEASE);
event->button.button = button;
}
/**
* clutter_event_get_click_count:
* @event: a #ClutterEvent of type %CLUTTER_BUTTON_PRESS or
* of type %CLUTTER_BUTTON_RELEASE
*
* Retrieves the number of clicks of @event
*
* Return value: the click count
*
* Since: 1.0
*/
guint32
clutter_event_get_click_count (const ClutterEvent *event)
{
g_return_val_if_fail (event != NULL, 0);
g_return_val_if_fail (event->type == CLUTTER_BUTTON_PRESS ||
event->type == CLUTTER_BUTTON_RELEASE, 0);
return event->button.click_count;
}
/* keys */
/**
* clutter_event_get_key_symbol:
* @event: a #ClutterEvent of type %CLUTTER_KEY_PRESS or
* of type %CLUTTER_KEY_RELEASE
*
* Retrieves the key symbol of @event
*
* Return value: the key symbol representing the key
*
* Since: 1.0
*/
guint
clutter_event_get_key_symbol (const ClutterEvent *event)
{
g_return_val_if_fail (event != NULL, 0);
g_return_val_if_fail (event->type == CLUTTER_KEY_PRESS ||
event->type == CLUTTER_KEY_RELEASE, 0);
return event->key.keyval;
}
/**
* clutter_event_set_key_symbol:
* @event: a #ClutterEvent of type %CLUTTER_KEY_PRESS
* or %CLUTTER_KEY_RELEASE
* @key_sym: the key symbol representing the key
*
* Sets the key symbol of @event.
*
* Since: 1.8
*/
void
clutter_event_set_key_symbol (ClutterEvent *event,
guint key_sym)
{
g_return_if_fail (event != NULL);
g_return_if_fail (event->type == CLUTTER_KEY_PRESS ||
event->type == CLUTTER_KEY_RELEASE);
event->key.keyval = key_sym;
}
/**
* clutter_event_get_key_code:
* @event: a #ClutterEvent of type %CLUTTER_KEY_PRESS or
* of type %CLUTTER_KEY_RELEASE
*
* Retrieves the keycode of the key that caused @event
*
* Return value: The keycode representing the key
*
* Since: 1.0
*/
guint16
clutter_event_get_key_code (const ClutterEvent *event)
{
g_return_val_if_fail (event != NULL, 0);
g_return_val_if_fail (event->type == CLUTTER_KEY_PRESS ||
event->type == CLUTTER_KEY_RELEASE, 0);
return event->key.hardware_keycode;
}
/**
* clutter_event_set_key_code:
* @event: a #ClutterEvent of type %CLUTTER_KEY_PRESS
* or %CLUTTER_KEY_RELEASE
* @key_code: the keycode representing the key
*
* Sets the keycode of the @event.
*
* Since: 1.8
*/
void
clutter_event_set_key_code (ClutterEvent *event,
guint16 key_code)
{
g_return_if_fail (event != NULL);
g_return_if_fail (event->type == CLUTTER_KEY_PRESS ||
event->type == CLUTTER_KEY_RELEASE);
event->key.hardware_keycode = key_code;
}
/**
* clutter_event_get_key_unicode:
* @event: a #ClutterEvent of type %CLUTTER_KEY_PRESS
* or %CLUTTER_KEY_RELEASE
*
* Retrieves the unicode value for the key that caused @keyev.
*
* Return value: The unicode value representing the key
*/
guint32
clutter_event_get_key_unicode (const ClutterEvent *event)
{
g_return_val_if_fail (event != NULL, 0);
g_return_val_if_fail (event->type == CLUTTER_KEY_PRESS ||
event->type == CLUTTER_KEY_RELEASE, 0);
if (event->key.unicode_value)
return event->key.unicode_value;
else
return clutter_keysym_to_unicode (event->key.keyval);
}
/**
* clutter_event_set_key_unicode:
* @event: a #ClutterEvent of type %CLUTTER_KEY_PRESS
* or %CLUTTER_KEY_RELEASE
* @key_unicode: the Unicode value representing the key
*
* Sets the Unicode value of @event.
*
* Since: 1.8
*/
void
clutter_event_set_key_unicode (ClutterEvent *event,
guint32 key_unicode)
{
g_return_if_fail (event != NULL);
g_return_if_fail (event->type == CLUTTER_KEY_PRESS ||
event->type == CLUTTER_KEY_RELEASE);
event->key.unicode_value = key_unicode;
}
/**
* clutter_event_get_event_sequence:
* @event: a #ClutterEvent of type %CLUTTER_TOUCH_BEGIN,
* %CLUTTER_TOUCH_UPDATE, %CLUTTER_TOUCH_END, or
* %CLUTTER_TOUCH_CANCEL
*
* Retrieves the #ClutterEventSequence of @event.
*
* Return value: (transfer none): the event sequence, or %NULL
*
* Since: 1.10
*/
ClutterEventSequence *
clutter_event_get_event_sequence (const ClutterEvent *event)
{
g_return_val_if_fail (event != NULL, NULL);
if (event->type == CLUTTER_TOUCH_BEGIN ||
event->type == CLUTTER_TOUCH_UPDATE ||
event->type == CLUTTER_TOUCH_END ||
event->type == CLUTTER_TOUCH_CANCEL)
return event->touch.sequence;
return NULL;
}
/**
* clutter_event_get_device_id:
* @event: a clutter event
*
* Retrieves the events device id if set.
*
* Return value: A unique identifier for the device or -1 if the event has
* no specific device set.
*/
gint
clutter_event_get_device_id (const ClutterEvent *event)
{
ClutterInputDevice *device = NULL;
g_return_val_if_fail (event != NULL, CLUTTER_POINTER_DEVICE);
device = clutter_event_get_device (event);
if (device != NULL)
return clutter_input_device_get_device_id (device);
return -1;
}
/**
* clutter_event_get_device_type:
* @event: a #ClutterEvent
*
* Retrieves the type of the device for @event
*
* Return value: the #ClutterInputDeviceType for the device, if
* any is set
*
* Since: 1.0
*/
ClutterInputDeviceType
clutter_event_get_device_type (const ClutterEvent *event)
{
ClutterInputDevice *device = NULL;
g_return_val_if_fail (event != NULL, CLUTTER_POINTER_DEVICE);
device = clutter_event_get_device (event);
if (device != NULL)
return clutter_input_device_get_device_type (device);
return CLUTTER_POINTER_DEVICE;
}
/**
* clutter_event_set_device:
* @event: a #ClutterEvent
* @device: (allow-none): a #ClutterInputDevice, or %NULL
*
* Sets the device for @event.
*
* Since: 1.6
*/
void
clutter_event_set_device (ClutterEvent *event,
ClutterInputDevice *device)
{
g_return_if_fail (event != NULL);
g_return_if_fail (device == NULL || CLUTTER_IS_INPUT_DEVICE (device));
if (is_event_allocated (event))
{
ClutterEventPrivate *real_event = (ClutterEventPrivate *) event;
real_event->device = device;
}
switch (event->type)
{
case CLUTTER_NOTHING:
case CLUTTER_STAGE_STATE:
case CLUTTER_DESTROY_NOTIFY:
case CLUTTER_CLIENT_MESSAGE:
case CLUTTER_DELETE:
case CLUTTER_EVENT_LAST:
break;
case CLUTTER_ENTER:
case CLUTTER_LEAVE:
event->crossing.device = device;
break;
case CLUTTER_BUTTON_PRESS:
case CLUTTER_BUTTON_RELEASE:
event->button.device = device;
break;
case CLUTTER_MOTION:
event->motion.device = device;
break;
case CLUTTER_SCROLL:
event->scroll.device = device;
break;
case CLUTTER_TOUCH_BEGIN:
case CLUTTER_TOUCH_UPDATE:
case CLUTTER_TOUCH_END:
case CLUTTER_TOUCH_CANCEL:
event->touch.device = device;
break;
case CLUTTER_KEY_PRESS:
case CLUTTER_KEY_RELEASE:
event->key.device = device;
break;
}
}
/**
* clutter_event_get_device:
* @event: a #ClutterEvent
*
* Retrieves the #ClutterInputDevice for the event.
*
* The #ClutterInputDevice structure is completely opaque and should
* be cast to the platform-specific implementation.
*
* Return value: (transfer none): the #ClutterInputDevice or %NULL. The
* returned device is owned by the #ClutterEvent and it should not
* be unreferenced
*
* Since: 1.0
*/
ClutterInputDevice *
clutter_event_get_device (const ClutterEvent *event)
{
ClutterInputDevice *device = NULL;
g_return_val_if_fail (event != NULL, NULL);
if (is_event_allocated (event))
{
ClutterEventPrivate *real_event = (ClutterEventPrivate *) event;
if (real_event->device != NULL)
return real_event->device;
}
switch (event->type)
{
case CLUTTER_NOTHING:
case CLUTTER_STAGE_STATE:
case CLUTTER_DESTROY_NOTIFY:
case CLUTTER_CLIENT_MESSAGE:
case CLUTTER_DELETE:
case CLUTTER_EVENT_LAST:
break;
case CLUTTER_ENTER:
case CLUTTER_LEAVE:
device = event->crossing.device;
break;
case CLUTTER_BUTTON_PRESS:
case CLUTTER_BUTTON_RELEASE:
device = event->button.device;
break;
case CLUTTER_MOTION:
device = event->motion.device;
break;
case CLUTTER_SCROLL:
device = event->scroll.device;
break;
case CLUTTER_TOUCH_BEGIN:
case CLUTTER_TOUCH_UPDATE:
case CLUTTER_TOUCH_END:
case CLUTTER_TOUCH_CANCEL:
device = event->touch.device;
break;
case CLUTTER_KEY_PRESS:
case CLUTTER_KEY_RELEASE:
device = event->key.device;
break;
}
return device;
}
/**
* clutter_event_new:
* @type: The type of event.
*
* Creates a new #ClutterEvent of the specified type.
*
* Return value: (transfer full): A newly allocated #ClutterEvent.
*/
ClutterEvent *
clutter_event_new (ClutterEventType type)
{
ClutterEvent *new_event;
ClutterEventPrivate *priv;
priv = g_slice_new0 (ClutterEventPrivate);
new_event = (ClutterEvent *) priv;
new_event->type = new_event->any.type = type;
if (G_UNLIKELY (all_events == NULL))
all_events = g_hash_table_new (NULL, NULL);
g_hash_table_replace (all_events, priv, GUINT_TO_POINTER (1));
return new_event;
}
/**
* clutter_event_copy:
* @event: A #ClutterEvent.
*
* Copies @event.
*
* Return value: (transfer full): A newly allocated #ClutterEvent
*/
ClutterEvent *
clutter_event_copy (const ClutterEvent *event)
{
ClutterEvent *new_event;
ClutterEventPrivate *new_real_event;
ClutterInputDevice *device;
gint n_axes = 0;
g_return_val_if_fail (event != NULL, NULL);
new_event = clutter_event_new (CLUTTER_NOTHING);
new_real_event = (ClutterEventPrivate *) new_event;
*new_event = *event;
if (is_event_allocated (event))
{
ClutterEventPrivate *real_event = (ClutterEventPrivate *) event;
new_real_event->device = real_event->device;
new_real_event->source_device = real_event->source_device;
new_real_event->delta_x = real_event->delta_x;
new_real_event->delta_y = real_event->delta_y;
new_real_event->is_pointer_emulated = real_event->is_pointer_emulated;
}
device = clutter_event_get_device (event);
if (device != NULL)
n_axes = clutter_input_device_get_n_axes (device);
switch (event->type)
{
case CLUTTER_BUTTON_PRESS:
case CLUTTER_BUTTON_RELEASE:
if (event->button.axes != NULL)
new_event->button.axes = g_memdup (event->button.axes,
sizeof (gdouble) * n_axes);
break;
case CLUTTER_SCROLL:
if (event->scroll.axes != NULL)
new_event->scroll.axes = g_memdup (event->scroll.axes,
sizeof (gdouble) * n_axes);
break;
case CLUTTER_MOTION:
if (event->motion.axes != NULL)
new_event->motion.axes = g_memdup (event->motion.axes,
sizeof (gdouble) * n_axes);
break;
case CLUTTER_TOUCH_BEGIN:
case CLUTTER_TOUCH_UPDATE:
case CLUTTER_TOUCH_END:
case CLUTTER_TOUCH_CANCEL:
if (event->touch.axes != NULL)
new_event->touch.axes = g_memdup (event->touch.axes,
sizeof (gdouble) * n_axes);
break;
default:
break;
}
if (is_event_allocated (event))
_clutter_backend_copy_event_data (clutter_get_default_backend (),
event,
new_event);
return new_event;
}
/**
* clutter_event_free:
* @event: A #ClutterEvent.
*
* Frees all resources used by @event.
*/
void
clutter_event_free (ClutterEvent *event)
{
if (G_LIKELY (event != NULL))
{
_clutter_backend_free_event_data (clutter_get_default_backend (), event);
switch (event->type)
{
case CLUTTER_BUTTON_PRESS:
case CLUTTER_BUTTON_RELEASE:
g_free (event->button.axes);
break;
case CLUTTER_MOTION:
g_free (event->motion.axes);
break;
case CLUTTER_SCROLL:
g_free (event->scroll.axes);
break;
case CLUTTER_TOUCH_BEGIN:
case CLUTTER_TOUCH_UPDATE:
case CLUTTER_TOUCH_END:
case CLUTTER_TOUCH_CANCEL:
g_free (event->touch.axes);
break;
default:
break;
}
g_hash_table_remove (all_events, event);
g_slice_free (ClutterEventPrivate, (ClutterEventPrivate *) event);
}
}
/**
* clutter_event_get:
*
* Pops an event off the event queue. Applications should not need to call
* this.
*
* Return value: A #ClutterEvent or NULL if queue empty
*
* Since: 0.4
*/
ClutterEvent *
clutter_event_get (void)
{
ClutterMainContext *context = _clutter_context_get_default ();
if (context->events_queue == NULL)
return NULL;
if (g_queue_is_empty (context->events_queue))
return NULL;
return g_queue_pop_tail (context->events_queue);
}
/**
* clutter_event_peek:
*
* Returns a pointer to the first event from the event queue but
* does not remove it.
*
* Return value: (transfer none): A #ClutterEvent or NULL if queue empty.
*
* Since: 0.4
*/
ClutterEvent *
clutter_event_peek (void)
{
ClutterMainContext *context = _clutter_context_get_default ();
g_return_val_if_fail (context != NULL, NULL);
if (context->events_queue == NULL)
return NULL;
if (g_queue_is_empty (context->events_queue))
return NULL;
return g_queue_peek_tail (context->events_queue);
}
void
_clutter_event_push (const ClutterEvent *event,
gboolean do_copy)
{
ClutterMainContext *context = _clutter_context_get_default ();
ClutterInputDevice *device;
g_assert (context != NULL);
if (context->events_queue == NULL)
context->events_queue = g_queue_new ();
/* disabled devices don't propagate events */
device = clutter_event_get_device (event);
if (device != NULL)
{
if (!clutter_input_device_get_enabled (device))
return;
}
if (do_copy)
{
ClutterEvent *copy;
copy = clutter_event_copy (event);
event = copy;
}
g_queue_push_head (context->events_queue, (gpointer) event);
}
/**
* clutter_event_put:
* @event: a #ClutterEvent
*
* Puts a copy of the event on the back of the event queue. The event will
* have the %CLUTTER_EVENT_FLAG_SYNTHETIC flag set. If the source is set
* event signals will be emitted for this source and capture/bubbling for
* its ancestors. If the source is not set it will be generated by picking
* or use the actor that currently has keyboard focus
*
* Since: 0.6
*/
void
clutter_event_put (const ClutterEvent *event)
{
_clutter_event_push (event, TRUE);
}
/**
* clutter_events_pending:
*
* Checks if events are pending in the event queue.
*
* Return value: TRUE if there are pending events, FALSE otherwise.
*
* Since: 0.4
*/
gboolean
clutter_events_pending (void)
{
ClutterMainContext *context = _clutter_context_get_default ();
g_return_val_if_fail (context != NULL, FALSE);
if (context->events_queue == NULL)
return FALSE;
return g_queue_is_empty (context->events_queue) == FALSE;
}
/**
* clutter_get_current_event_time:
*
* Retrieves the timestamp of the last event, if there is an
* event or if the event has a timestamp.
*
* Return value: the event timestamp, or %CLUTTER_CURRENT_TIME
*
* Since: 1.0
*/
guint32
clutter_get_current_event_time (void)
{
const ClutterEvent* event;
event = clutter_get_current_event ();
if (event != NULL)
return clutter_event_get_time (event);
return CLUTTER_CURRENT_TIME;
}
/**
* clutter_get_current_event:
*
* If an event is currently being processed, return that event.
* This function is intended to be used to access event state
* that might not be exposed by higher-level widgets. For
* example, to get the key modifier state from a Button 'clicked'
* event.
*
* Return value: (transfer none): The current ClutterEvent, or %NULL if none
*
* Since: 1.2
*/
const ClutterEvent *
clutter_get_current_event (void)
{
ClutterMainContext *context = _clutter_context_get_default ();
g_return_val_if_fail (context != NULL, NULL);
return context->current_event != NULL ? context->current_event->data : NULL;
}
/**
* clutter_event_get_source_device:
* @event: a #ClutterEvent
*
* Retrieves the hardware device that originated the event.
*
* If you need the virtual device, use clutter_event_get_device().
*
* If no hardware device originated this event, this function will
* return the same device as clutter_event_get_device().
*
* Return value: (transfer none): a pointer to a #ClutterInputDevice
* or %NULL
*
* Since: 1.6
*/
ClutterInputDevice *
clutter_event_get_source_device (const ClutterEvent *event)
{
ClutterEventPrivate *real_event;
if (!is_event_allocated (event))
return NULL;
real_event = (ClutterEventPrivate *) event;
if (real_event->source_device != NULL)
return real_event->source_device;
return clutter_event_get_device (event);
}
/**
* clutter_event_set_source_device:
* @event: a #ClutterEvent
* @device: (allow-none): a #ClutterInputDevice
*
* Sets the source #ClutterInputDevice for @event.
*
* The #ClutterEvent must have been created using clutter_event_new().
*
* Since: 1.8
*/
void
clutter_event_set_source_device (ClutterEvent *event,
ClutterInputDevice *device)
{
ClutterEventPrivate *real_event;
g_return_if_fail (event != NULL);
g_return_if_fail (device == NULL || CLUTTER_IS_INPUT_DEVICE (device));
if (!is_event_allocated (event))
return;
real_event = (ClutterEventPrivate *) event;
real_event->source_device = device;
}
/**
* clutter_event_get_axes:
* @event: a #ClutterEvent
* @n_axes: (out): return location for the number of axes returned
*
* Retrieves the array of axes values attached to the event.
*
* Return value: (transfer none): an array of axis values
*
* Since: 1.6
*/
gdouble *
clutter_event_get_axes (const ClutterEvent *event,
guint *n_axes)
{
gdouble *retval = NULL;
guint len = 0;
switch (event->type)
{
case CLUTTER_NOTHING:
case CLUTTER_STAGE_STATE:
case CLUTTER_DESTROY_NOTIFY:
case CLUTTER_CLIENT_MESSAGE:
case CLUTTER_DELETE:
case CLUTTER_ENTER:
case CLUTTER_LEAVE:
case CLUTTER_KEY_PRESS:
case CLUTTER_KEY_RELEASE:
case CLUTTER_EVENT_LAST:
break;
case CLUTTER_SCROLL:
retval = event->scroll.axes;
break;
case CLUTTER_BUTTON_PRESS:
case CLUTTER_BUTTON_RELEASE:
retval = event->button.axes;
break;
case CLUTTER_TOUCH_BEGIN:
case CLUTTER_TOUCH_UPDATE:
case CLUTTER_TOUCH_END:
case CLUTTER_TOUCH_CANCEL:
retval = event->touch.axes;
break;
case CLUTTER_MOTION:
retval = event->motion.axes;
break;
}
if (retval != NULL)
{
ClutterInputDevice *device;
device = clutter_event_get_device (event);
if (device != NULL)
len = clutter_input_device_get_n_axes (device);
else
retval = NULL;
}
if (n_axes)
*n_axes = len;
return retval;
}
/**
* clutter_event_get_distance:
* @source: a #ClutterEvent
* @target: a #ClutterEvent
*
* Retrieves the distance between two events, a @source and a @target.
*
* Return value: the distance between two #ClutterEvent
*
* Since: 1.12
*/
float
clutter_event_get_distance (const ClutterEvent *source,
const ClutterEvent *target)
{
ClutterPoint p0, p1;
clutter_event_get_position (source, &p0);
clutter_event_get_position (source, &p1);
return clutter_point_distance (&p0, &p1, NULL, NULL);
}
/**
* clutter_event_get_angle:
* @source: a #ClutterEvent
* @target: a #ClutterEvent
*
* Retrieves the angle relative from @source to @target.
*
* The direction of the angle is from the position X axis towards
* the positive Y axis.
*
* Return value: the angle between two #ClutterEvent
*
* Since: 1.12
*/
double
clutter_event_get_angle (const ClutterEvent *source,
const ClutterEvent *target)
{
ClutterPoint p0, p1;
float x_distance, y_distance;
double angle;
clutter_event_get_position (source, &p0);
clutter_event_get_position (target, &p1);
if (clutter_point_equals (&p0, &p1))
return 0;
clutter_point_distance (&p0, &p1, &x_distance, &y_distance);
angle = atan2 (x_distance, y_distance);
/* invert the angle, and shift it by 90 degrees */
angle = (2.0 * G_PI) - angle;
angle += G_PI / 2.0;
/* keep the angle within the [ 0, 360 ] interval */
angle = fmod (angle, 2.0 * G_PI);
return angle;
}
/**
* clutter_event_has_shift_modifier:
* @event: a #ClutterEvent
*
* Checks whether @event has the Shift modifier mask set.
*
* Return value: %TRUE if the event has the Shift modifier mask set
*
* Since: 1.12
*/
gboolean
clutter_event_has_shift_modifier (const ClutterEvent *event)
{
return (clutter_event_get_state (event) & CLUTTER_SHIFT_MASK) != FALSE;
}
/**
* clutter_event_has_control_modifier:
* @event: a #ClutterEvent
*
* Checks whether @event has the Control modifier mask set.
*
* Return value: %TRUE if the event has the Control modifier mask set
*
* Since: 1.12
*/
gboolean
clutter_event_has_control_modifier (const ClutterEvent *event)
{
return (clutter_event_get_state (event) & CLUTTER_CONTROL_MASK) != FALSE;
}
/**
* clutter_event_is_pointer_emulated:
* @event: a #ClutterEvent
*
* Checks whether a pointer @event has been generated by the windowing
* system. The returned value can be used to distinguish between events
* synthesized by the windowing system itself (as opposed by Clutter).
*
* Return value: %TRUE if the event is pointer emulated
*
* Since: 1.12
*/
gboolean
clutter_event_is_pointer_emulated (const ClutterEvent *event)
{
g_return_val_if_fail (event != NULL, FALSE);
if (!is_event_allocated (event))
return FALSE;
return ((ClutterEventPrivate *) event)->is_pointer_emulated;
}
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