mutter/clutter/clutter-event.c
Emmanuele Bassi a573ad05c9 event: The device setter work on sub-types
Instead of just setting the input device pointer in the private event
data, it should also set the field in the event sub-types, so that
direct access to the structures still works.
2011-02-01 14:44:22 +00:00

1100 lines
24 KiB
C

/*
* 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.h"
#include "clutter-keysyms.h"
#include "clutter-keysyms-table.h"
#include "clutter-private.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;
gpointer platform_data;
} 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;
}
void
_clutter_event_set_platform_data (ClutterEvent *event,
gpointer data)
{
if (!is_event_allocated (event))
return;
((ClutterEventPrivate *) event)->platform_data = data;
}
/**
* 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_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_MOTION:
return event->motion.modifier_state;
case CLUTTER_SCROLL:
return event->scroll.modifier_state;
default:
break;
}
return 0;
}
/**
* 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)
{
gfloat event_x, event_y;
g_return_if_fail (event != NULL);
event_x = event_y = 0;
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:
break;
case CLUTTER_ENTER:
case CLUTTER_LEAVE:
event_x = event->crossing.x;
event_y = event->crossing.y;
break;
case CLUTTER_BUTTON_PRESS:
case CLUTTER_BUTTON_RELEASE:
event_x = event->button.x;
event_y = event->button.y;
break;
case CLUTTER_MOTION:
event_x = event->motion.x;
event_y = event->motion.y;
break;
case CLUTTER_SCROLL:
event_x = event->scroll.x;
event_y = event->scroll.y;
break;
}
if (x)
*x = event_x;
if (y)
*y = event_y;
}
/**
* 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_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_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_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_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_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_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_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_get_key_unicode:
* @event: A #ClutterKeyEvent
*
* 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_keysym_to_unicode:
* @keyval: a key symbol
*
* Convert from a Clutter key symbol to the corresponding ISO10646 (Unicode)
* character.
*
* Return value: a Unicode character, or 0 if there is no corresponding
* character.
*/
guint32
clutter_keysym_to_unicode (guint keyval)
{
int min = 0;
int max = G_N_ELEMENTS (clutter_keysym_to_unicode_tab) - 1;
int mid;
/* First check for Latin-1 characters (1:1 mapping) */
if ((keyval >= 0x0020 && keyval <= 0x007e) ||
(keyval >= 0x00a0 && keyval <= 0x00ff))
return keyval;
/* Also check for directly encoded 24-bit UCS characters:
*/
if ((keyval & 0xff000000) == 0x01000000)
return keyval & 0x00ffffff;
/* binary search in table */
while (max >= min)
{
mid = (min + max) / 2;
if (clutter_keysym_to_unicode_tab[mid].keysym < keyval)
min = mid + 1;
else if (clutter_keysym_to_unicode_tab[mid].keysym > keyval)
max = mid - 1;
else
{
/* found it */
return clutter_keysym_to_unicode_tab[mid].ucs;
}
}
/* No matching Unicode value found */
return 0;
}
/**
* 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: a #ClutterInputDevice
*
* 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_ENTER:
case CLUTTER_LEAVE:
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_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_ENTER:
case CLUTTER_LEAVE:
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_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: 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: 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;
}
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;
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;
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)
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;
/* FIXME: check queue is valid */
g_assert (context != NULL);
/* 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);
copy->any.flags |= CLUTTER_EVENT_FLAG_SYNTHETIC;
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)
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)
{
ClutterMainContext *context = _clutter_context_get_default ();
g_return_val_if_fail (context != NULL, FALSE);
if (context->last_event_time != 0)
return context->last_event_time;
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
*/
G_CONST_RETURN ClutterEvent *
clutter_get_current_event (void)
{
ClutterMainContext *context = _clutter_context_get_default ();
g_return_val_if_fail (context != NULL, NULL);
return context->current_event;
}
/**
* 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);
}
void
_clutter_event_set_device (ClutterEvent *event,
ClutterInputDevice *device)
{
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:
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_KEY_PRESS:
case CLUTTER_KEY_RELEASE:
event->key.device = device;
break;
}
}
/*< private >
* clutter_event_set_source_device:
* @event: a #ClutterEvent
* @device: a #ClutterInputDevice
*
* Sets the source #ClutterInputDevice for @event.
*
* The #ClutterEvent must have been created using clutter_event_new().
*
* Since: 1.6
*/
void
_clutter_event_set_source_device (ClutterEvent *event,
ClutterInputDevice *device)
{
ClutterEventPrivate *real_event;
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:
break;
case CLUTTER_SCROLL:
retval = event->scroll.axes;
break;
case CLUTTER_BUTTON_PRESS:
case CLUTTER_BUTTON_RELEASE:
retval = event->button.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;
}