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mutter/clutter/clutter-event.c
Carlos Garnacho b151898534 clutter-event: Add API around touchpad gesture events 
These are needed in order to make these events binding friendly
2015-07-10 21:47:30 +02:00

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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;
ClutterModifierType button_state;
ClutterModifierType base_state;
ClutterModifierType latched_state;
ClutterModifierType locked_state;
guint is_pointer_emulated : 1;
} ClutterEventPrivate;
typedef struct _ClutterEventFilter {
int id;
ClutterStage *stage;
ClutterEventFilterFunc func;
GDestroyNotify notify;
gpointer user_data;
} ClutterEventFilter;
static GHashTable *all_events = NULL;
G_DEFINE_BOXED_TYPE (ClutterEvent, clutter_event,
clutter_event_copy,
clutter_event_free);
static ClutterEventSequence *
clutter_event_sequence_copy (ClutterEventSequence *sequence)
{
/* Nothing to copy here */
return sequence;
}
static void
clutter_event_sequence_free (ClutterEventSequence *sequence)
{
/* Nothing to free here */
}
G_DEFINE_BOXED_TYPE (ClutterEventSequence, clutter_event_sequence,
clutter_event_sequence_copy,
clutter_event_sequence_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. In case the window system
* supports reporting latched and locked modifiers, this function returns
* the effective state.
*
* 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;
}
}
void
_clutter_event_set_state_full (ClutterEvent *event,
ClutterModifierType button_state,
ClutterModifierType base_state,
ClutterModifierType latched_state,
ClutterModifierType locked_state,
ClutterModifierType effective_state)
{
ClutterEventPrivate *private = (ClutterEventPrivate*) event;
private->button_state = button_state;
private->base_state = base_state;
private->latched_state = latched_state;
private->locked_state = locked_state;
clutter_event_set_state (event, effective_state);
}
/**
* clutter_event_get_state_full:
* @event: a #ClutterEvent
* @button_state: (out) (allow-none): the pressed buttons as a mask
* @base_state: (out) (allow-none): the regular pressed modifier keys
* @latched_state: (out) (allow-none): the latched modifier keys (currently released but still valid for one key press/release)
* @locked_state: (out) (allow-none): the locked modifier keys (valid until the lock key is pressed and released again)
* @effective_state: (out) (allow-none): the logical OR of all the state bits above
*
* Retrieves the decomposition of the keyboard state into button, base,
* latched, locked and effective. This can be used to transmit to other
* applications, for example when implementing a wayland compositor.
*
* Since: 1.16
*/
void
clutter_event_get_state_full (const ClutterEvent *event,
ClutterModifierType *button_state,
ClutterModifierType *base_state,
ClutterModifierType *latched_state,
ClutterModifierType *locked_state,
ClutterModifierType *effective_state)
{
const ClutterEventPrivate *private = (const ClutterEventPrivate*) event;
g_return_if_fail (event != NULL);
if (button_state)
*button_state = private->button_state;
if (base_state)
*base_state = private->base_state;
if (latched_state)
*latched_state = private->latched_state;
if (locked_state)
*locked_state = private->locked_state;
if (effective_state)
*effective_state = clutter_event_get_state (event);
}
/**
* 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;
case CLUTTER_TOUCHPAD_PINCH:
clutter_point_init (position, event->touchpad_pinch.x,
event->touchpad_pinch.y);
break;
case CLUTTER_TOUCHPAD_SWIPE:
clutter_point_init (position, event->touchpad_swipe.x,
event->touchpad_swipe.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;
case CLUTTER_TOUCHPAD_PINCH:
event->touchpad_pinch.x = x;
event->touchpad_pinch.y = y;
break;
case CLUTTER_TOUCHPAD_SWIPE:
event->touchpad_swipe.x = x;
event->touchpad_swipe.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
*/
gunichar
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,
gunichar 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;
case CLUTTER_TOUCHPAD_PINCH:
case CLUTTER_TOUCHPAD_SWIPE:
/* Rely on priv data for these */
break;
}
}
/**
* clutter_event_get_device:
* @event: a #ClutterEvent
*
* Retrieves the #ClutterInputDevice for the event.
* If you want the physical device the event originated from, use
* clutter_event_get_source_device().
*
* 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;
case CLUTTER_TOUCHPAD_PINCH:
case CLUTTER_TOUCHPAD_SWIPE:
/* Rely on priv data for these */
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;
new_real_event->base_state = real_event->base_state;
new_real_event->button_state = real_event->button_state;
new_real_event->latched_state = real_event->latched_state;
new_real_event->locked_state = real_event->locked_state;
}
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;
case CLUTTER_TOUCHPAD_PINCH:
case CLUTTER_TOUCHPAD_SWIPE:
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;
}
gboolean
_clutter_event_process_filters (ClutterEvent *event)
{
ClutterMainContext *context = _clutter_context_get_default ();
GList *l, *next;
/* Event filters are handled in order from least recently added to
* most recently added */
for (l = context->event_filters; l; l = next)
{
ClutterEventFilter *event_filter = l->data;
next = l->next;
if (event_filter->stage && event_filter->stage != event->any.stage)
continue;
if (event_filter->func (event, event_filter->user_data) == CLUTTER_EVENT_STOP)
return CLUTTER_EVENT_STOP;
}
return CLUTTER_EVENT_PROPAGATE;
}
/**
* clutter_event_add_filter:
* @stage: (allow-none): The #ClutterStage to capture events for
* @func: The callback function which will be passed all events.
* @notify: A #GDestroyNotify
* @user_data: A data pointer to pass to the function.
*
* Adds a function which will be called for all events that Clutter
* processes. The function will be called before any signals are
* emitted for the event and it will take precedence over any grabs.
*
* Return value: an identifier for the event filter, to be used
* with clutter_event_remove_filter().
*
* Since: 1.18
*/
guint
clutter_event_add_filter (ClutterStage *stage,
ClutterEventFilterFunc func,
GDestroyNotify notify,
gpointer user_data)
{
ClutterMainContext *context = _clutter_context_get_default ();
ClutterEventFilter *event_filter = g_slice_new (ClutterEventFilter);
static guint event_filter_id = 0;
event_filter->stage = stage;
event_filter->id = ++event_filter_id;
event_filter->func = func;
event_filter->notify = notify;
event_filter->user_data = user_data;
/* The event filters are kept in order from least recently added to
* most recently added so we must add it to the end */
context->event_filters = g_list_append (context->event_filters, event_filter);
return event_filter->id;
}
/**
* clutter_event_remove_filter:
* @id: The ID of the event filter, as returned from clutter_event_add_filter()
*
* Removes an event filter that was previously added with
* clutter_event_add_filter().
*
* Since: 1.18
*/
void
clutter_event_remove_filter (guint id)
{
ClutterMainContext *context = _clutter_context_get_default ();
GList *l;
for (l = context->event_filters; l; l = l->next)
{
ClutterEventFilter *event_filter = l->data;
if (event_filter->id == id)
{
if (event_filter->notify)
event_filter->notify (event_filter->user_data);
context->event_filters = g_list_delete_link (context->event_filters, l);
g_slice_free (ClutterEventFilter, event_filter);
return;
}
}
g_warning ("No event filter found for id: %d\n", id);
}
/**
* clutter_event_get_gesture_swipe_finger_count:
* @event: a touchpad swipe event
*
* Returns the number of fingers that is triggering the touchpad gesture.
*
* Returns: the number of fingers swiping.
*
* Since: 1.24
**/
guint
clutter_event_get_gesture_swipe_finger_count (const ClutterEvent *event)
{
g_return_val_if_fail (event != NULL, 0);
g_return_val_if_fail (event->type == CLUTTER_TOUCHPAD_SWIPE, 0);
return event->touchpad_swipe.n_fingers;
}
/**
* clutter_event_get_gesture_pinch_angle_delta:
* @event: a touchpad pinch event
*
* Returns the angle delta reported by this specific event.
*
* Returns: The angle delta relative to the previous event.
*
* Since: 1.24
**/
gdouble
clutter_event_get_gesture_pinch_angle_delta (const ClutterEvent *event)
{
g_return_val_if_fail (event != NULL, 0);
g_return_val_if_fail (event->type == CLUTTER_TOUCHPAD_PINCH, 0);
return event->touchpad_pinch.angle_delta;
}
/**
* clutter_event_get_gesture_pinch_scale:
* @event: a touchpad pinch event
*
* Returns the current scale as reported by @event, 1.0 being the original
* distance at the time the corresponding event with phase
* %CLUTTER_TOUCHPAD_GESTURE_PHASE_BEGIN is received.
* is received.
*
* Returns: the current pinch gesture scale
*
* Since: 1.24
**/
gdouble
clutter_event_get_gesture_pinch_scale (const ClutterEvent *event)
{
g_return_val_if_fail (event != NULL, 0);
g_return_val_if_fail (event->type == CLUTTER_TOUCHPAD_PINCH, 0);
return event->touchpad_pinch.scale;
}
/**
* clutter_event_get_gesture_phase:
* @event: a touchpad gesture event
*
* Returns the phase of the event, See #ClutterTouchpadGesturePhase.
*
* Returns: the phase of the gesture event.
**/
ClutterTouchpadGesturePhase
clutter_event_get_gesture_phase (const ClutterEvent *event)
{
g_return_val_if_fail (event != NULL, 0);
g_return_val_if_fail (event->type == CLUTTER_TOUCHPAD_PINCH ||
event->type == CLUTTER_TOUCHPAD_SWIPE, 0);
if (event->type == CLUTTER_TOUCHPAD_PINCH)
return event->touchpad_pinch.phase;
else if (event->type == CLUTTER_TOUCHPAD_SWIPE)
return event->touchpad_swipe.phase;
/* Shouldn't ever happen */
return CLUTTER_TOUCHPAD_GESTURE_PHASE_BEGIN;
};
/**
* clutter_event_get_gesture_motion_delta:
* @event: A clutter touchpad gesture event
* @dx: (out) (allow-none): the displacement relative to the pointer
* position in the X axis, or %NULL
* @dy: (out) (allow-none): the displacement relative to the pointer
* position in the Y axis, or %NULL
*
* Returns the gesture motion deltas relative to the current pointer
* position.
*
* Since: 1.24
**/
void
clutter_event_get_gesture_motion_delta (const ClutterEvent *event,
gdouble *dx,
gdouble *dy)
{
g_return_val_if_fail (event != NULL, FALSE);
g_return_val_if_fail (event->type == CLUTTER_TOUCHPAD_PINCH ||
event->type == CLUTTER_TOUCHPAD_SWIPE, FALSE);
if (event->type == CLUTTER_TOUCHPAD_PINCH)
{
if (dx)
*dx = event->touchpad_pinch.dx;
if (dy)
*dy = event->touchpad_pinch.dy;
}
else if (event->type == CLUTTER_TOUCHPAD_SWIPE)
{
if (dx)
*dx = event->touchpad_swipe.dx;
if (dy)
*dy = event->touchpad_swipe.dy;
}
}
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