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mutter/clutter/clutter-gesture-action.c
Emmanuele Bassi ed2fdf85f6 gesture: Make threshold-trigger-edge public 
When the threshold-trigger-edge property was introduced in
GestureAction, it was late in the cycle and I elected to keep it
private, given the fact that nobody was subclassing GestureAction
outside of Clutter itself.

These days, people are experimenting more with the GestureAction API, so
they will need access to the various knobs that control the class
default behaviour.

https://bugzilla.gnome.org/show_bug.cgi?id=710227
2013-12-05 15:20:39 +00:00

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/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Copyright (C) 2010 Intel Corporation.
* Copyright (C) 2011 Robert Bosch Car Multimedia GmbH.
* Copyright (C) 2012 Intel Corporation.
*
* 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/>.
*
* Author:
* Tomeu Vizoso <tomeu.vizoso@collabora.co.uk>
*/
/**
* SECTION:clutter-gesture-action
* @Title: ClutterGestureAction
* @Short_Description: Action for gesture gestures
*
* #ClutterGestureAction is a sub-class of #ClutterAction that implements
* the logic for recognizing gesture gestures. It listens for low level events
* such as #ClutterButtonEvent and #ClutterMotionEvent on the stage to raise
* the #ClutterGestureAction::gesture-begin, #ClutterGestureAction::gesture-progress,
* and #ClutterGestureAction::gesture-end signals.
*
* To use #ClutterGestureAction you just need to apply it to a #ClutterActor
* using clutter_actor_add_action() and connect to the signals:
*
* |[
* ClutterAction *action = clutter_gesture_action_new ();
*
* clutter_actor_add_action (actor, action);
*
* g_signal_connect (action, "gesture-begin", G_CALLBACK (on_gesture_begin), NULL);
* g_signal_connect (action, "gesture-progress", G_CALLBACK (on_gesture_progress), NULL);
* g_signal_connect (action, "gesture-end", G_CALLBACK (on_gesture_end), NULL);
* ]|
*
* <refsect2 id="creating-gesture-action">
* <title>Creating Gesture actions</title>
* <para>A #ClutterGestureAction provides four separate states that can be
* used to recognize or ignore gestures when writing a new action class:</para>
* <informalexample><programlisting><![CDATA[
Prepare -> Cancel
Prepare -> Begin -> Cancel
Prepare -> Begin -> End
Prepare -> Begin -> Progress -> Cancel
Prepare -> Begin -> Progress -> End
* ]]>
* </programlisting></informalexample>
* <para>Each #ClutterGestureAction starts in the "prepare" state, and calls
* the #ClutterGestureActionClass.gesture_prepare() virtual function; this
* state can be used to reset the internal state of a #ClutterGestureAction
* subclass, but it can also immediately cancel a gesture without going
* through the rest of the states.</para>
* <para>The "begin" state follows the "prepare" state, and calls the
* #ClutterGestureActionClass.gesture_begin() virtual function. This state
* signals the start of a gesture recognizing process. From the "begin" state
* the gesture recognition process can successfully end, by going to the
* "end" state; it can continue in the "progress" state, in case of a
* continuous gesture; or it can be terminated, by moving to the "cancel"
* state.</para>
* <para>In case of continuous gestures, the #ClutterGestureAction will use
* the "progress" state, calling the #ClutterGestureActionClass.gesture_progress()
* virtual function; the "progress" state will continue until the end of the
* gesture, in which case the "end" state will be reached, or until the
* gesture is cancelled, in which case the "cancel" gesture will be used
* instead.</para>
* </refsect2>
*
* Since: 1.8
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "clutter-gesture-action-private.h"
#include "clutter-debug.h"
#include "clutter-enum-types.h"
#include "clutter-marshal.h"
#include "clutter-private.h"
#include <math.h>
#define MAX_GESTURE_POINTS (10)
#define FLOAT_EPSILON (1e-15)
typedef struct
{
ClutterInputDevice *device;
ClutterEventSequence *sequence;
ClutterEvent *last_event;
gfloat press_x, press_y;
gint64 last_motion_time;
gfloat last_motion_x, last_motion_y;
gint64 last_delta_time;
gfloat last_delta_x, last_delta_y;
gfloat release_x, release_y;
} GesturePoint;
struct _ClutterGestureActionPrivate
{
ClutterActor *stage;
gint requested_nb_points;
GArray *points;
guint actor_capture_id;
gulong stage_capture_id;
ClutterGestureTriggerEdge edge;
guint in_gesture : 1;
};
enum
{
PROP_0,
PROP_N_TOUCH_POINTS,
PROP_THRESHOLD_TRIGGER_EDGE,
PROP_LAST
};
enum
{
GESTURE_BEGIN,
GESTURE_PROGRESS,
GESTURE_END,
GESTURE_CANCEL,
LAST_SIGNAL
};
static GParamSpec *gesture_props[PROP_LAST];
static guint gesture_signals[LAST_SIGNAL] = { 0, };
G_DEFINE_TYPE_WITH_PRIVATE (ClutterGestureAction, clutter_gesture_action, CLUTTER_TYPE_ACTION)
static GesturePoint *
gesture_register_point (ClutterGestureAction *action, ClutterEvent *event)
{
ClutterGestureActionPrivate *priv = action->priv;
GesturePoint *point = NULL;
if (priv->points->len >= MAX_GESTURE_POINTS)
return NULL;
g_array_set_size (priv->points, priv->points->len + 1);
point = &g_array_index (priv->points, GesturePoint, priv->points->len - 1);
point->last_event = clutter_event_copy (event);
point->device = clutter_event_get_device (event);
clutter_event_get_coords (event, &point->press_x, &point->press_y);
point->last_motion_x = point->press_x;
point->last_motion_y = point->press_y;
point->last_motion_time = clutter_event_get_time (event);
point->last_delta_x = point->last_delta_y = 0;
point->last_delta_time = 0;
if (clutter_event_type (event) != CLUTTER_BUTTON_PRESS)
point->sequence = clutter_event_get_event_sequence (event);
else
point->sequence = NULL;
return point;
}
static GesturePoint *
gesture_find_point (ClutterGestureAction *action,
ClutterEvent *event,
gint *position)
{
ClutterGestureActionPrivate *priv = action->priv;
GesturePoint *point = NULL;
ClutterEventType type = clutter_event_type (event);
ClutterInputDevice *device = clutter_event_get_device (event);
ClutterEventSequence *sequence = NULL;
gint i;
if ((type != CLUTTER_BUTTON_PRESS) &&
(type != CLUTTER_BUTTON_RELEASE) &&
(type != CLUTTER_MOTION))
sequence = clutter_event_get_event_sequence (event);
for (i = 0; i < priv->points->len; i++)
{
if ((g_array_index (priv->points, GesturePoint, i).device == device) &&
(g_array_index (priv->points, GesturePoint, i).sequence == sequence))
{
if (position != NULL)
*position = i;
point = &g_array_index (priv->points, GesturePoint, i);
break;
}
}
return point;
}
static void
gesture_unregister_point (ClutterGestureAction *action, gint position)
{
ClutterGestureActionPrivate *priv = action->priv;
g_array_remove_index (priv->points, position);
}
static void
gesture_update_motion_point (GesturePoint *point,
ClutterEvent *event)
{
gfloat motion_x, motion_y;
gint64 _time;
clutter_event_get_coords (event, &motion_x, &motion_y);
clutter_event_free (point->last_event);
point->last_event = clutter_event_copy (event);
point->last_delta_x = motion_x - point->last_motion_x;
point->last_delta_y = motion_y - point->last_motion_y;
point->last_motion_x = motion_x;
point->last_motion_y = motion_y;
_time = clutter_event_get_time (event);
point->last_delta_time = _time - point->last_motion_time;
point->last_motion_time = _time;
}
static void
gesture_update_release_point (GesturePoint *point,
ClutterEvent *event)
{
gint64 _time;
clutter_event_get_coords (event, &point->release_x, &point->release_y);
clutter_event_free (point->last_event);
point->last_event = clutter_event_copy (event);
/* Treat the release event as the continuation of the last motion,
* in case the user keeps the pointer still for a while before
* releasing it. */
_time = clutter_event_get_time (event);
point->last_delta_time += _time - point->last_motion_time;
}
static gint
gesture_get_threshold (void)
{
gint threshold;
ClutterSettings *settings = clutter_settings_get_default ();
g_object_get (settings, "dnd-drag-threshold", &threshold, NULL);
return threshold;
}
static gboolean
gesture_point_pass_threshold (GesturePoint *point, ClutterEvent *event)
{
gint drag_threshold = gesture_get_threshold ();
gfloat motion_x, motion_y;
clutter_event_get_coords (event, &motion_x, &motion_y);
if ((fabsf (point->press_y - motion_y) < drag_threshold) &&
(fabsf (point->press_x - motion_x) < drag_threshold))
return TRUE;
return FALSE;
}
static void
gesture_point_unset (GesturePoint *point)
{
clutter_event_free (point->last_event);
}
static void
cancel_gesture (ClutterGestureAction *action)
{
ClutterGestureActionPrivate *priv = action->priv;
ClutterActor *actor;
priv->in_gesture = FALSE;
if (priv->stage_capture_id != 0)
{
g_signal_handler_disconnect (priv->stage, priv->stage_capture_id);
priv->stage_capture_id = 0;
}
actor = clutter_actor_meta_get_actor (CLUTTER_ACTOR_META (action));
g_signal_emit (action, gesture_signals[GESTURE_CANCEL], 0, actor);
g_array_set_size (action->priv->points, 0);
}
static gboolean
begin_gesture (ClutterGestureAction *action,
ClutterActor *actor)
{
ClutterGestureActionPrivate *priv = action->priv;
gboolean return_value;
priv->in_gesture = TRUE;
if (!CLUTTER_GESTURE_ACTION_GET_CLASS (action)->gesture_prepare (action, actor))
{
cancel_gesture (action);
return FALSE;
}
/* clutter_gesture_action_cancel() may have been called during
* gesture_prepare(), check that the gesture is still active. */
if (!priv->in_gesture)
return FALSE;
g_signal_emit (action, gesture_signals[GESTURE_BEGIN], 0, actor,
&return_value);
if (!return_value)
{
cancel_gesture (action);
return FALSE;
}
return TRUE;
}
static gboolean
stage_captured_event_cb (ClutterActor *stage,
ClutterEvent *event,
ClutterGestureAction *action)
{
ClutterGestureActionPrivate *priv = action->priv;
ClutterActor *actor;
gint position, drag_threshold;
gboolean return_value;
GesturePoint *point;
if ((point = gesture_find_point (action, event, &position)) == NULL)
return CLUTTER_EVENT_PROPAGATE;
actor = clutter_actor_meta_get_actor (CLUTTER_ACTOR_META (action));
switch (clutter_event_type (event))
{
case CLUTTER_MOTION:
{
ClutterModifierType mods = clutter_event_get_state (event);
/* we might miss a button-release event in case of grabs,
* so we need to check whether the button is still down
* during a motion event
*/
if (!(mods & CLUTTER_BUTTON1_MASK))
{
cancel_gesture (action);
return CLUTTER_EVENT_PROPAGATE;
}
}
/* Follow same code path as a touch event update */
case CLUTTER_TOUCH_UPDATE:
if (!priv->in_gesture)
{
if (priv->points->len < priv->requested_nb_points)
{
gesture_update_motion_point (point, event);
return CLUTTER_EVENT_PROPAGATE;
}
/* Wait until the drag threshold has been exceeded
* before starting _TRIGGER_EDGE_AFTER gestures. */
if (priv->edge == CLUTTER_GESTURE_TRIGGER_EDGE_AFTER &&
gesture_point_pass_threshold (point, event))
{
gesture_update_motion_point (point, event);
return CLUTTER_EVENT_PROPAGATE;
}
if (!begin_gesture (action, actor))
{
if ((point = gesture_find_point (action, event, &position)) != NULL)
gesture_update_motion_point (point, event);
return CLUTTER_EVENT_PROPAGATE;
}
if ((point = gesture_find_point (action, event, &position)) == NULL)
return CLUTTER_EVENT_PROPAGATE;
}
gesture_update_motion_point (point, event);
g_signal_emit (action, gesture_signals[GESTURE_PROGRESS], 0, actor,
&return_value);
if (!return_value)
{
cancel_gesture (action);
return CLUTTER_EVENT_PROPAGATE;
}
/* Check if a _TRIGGER_EDGE_BEFORE gesture needs to be cancelled because
* the drag threshold has been exceeded. */
drag_threshold = gesture_get_threshold ();
if (priv->edge == CLUTTER_GESTURE_TRIGGER_EDGE_BEFORE &&
((fabsf (point->press_y - point->last_motion_y) > drag_threshold) ||
(fabsf (point->press_x - point->last_motion_x) > drag_threshold)))
{
cancel_gesture (action);
return CLUTTER_EVENT_PROPAGATE;
}
break;
case CLUTTER_BUTTON_RELEASE:
case CLUTTER_TOUCH_END:
{
gesture_update_release_point (point, event);
if (priv->in_gesture &&
((priv->points->len - 1) < priv->requested_nb_points))
{
priv->in_gesture = FALSE;
g_signal_emit (action, gesture_signals[GESTURE_END], 0, actor);
}
gesture_unregister_point (action, position);
}
break;
case CLUTTER_TOUCH_CANCEL:
{
gesture_update_release_point (point, event);
if (priv->in_gesture)
{
priv->in_gesture = FALSE;
cancel_gesture (action);
}
gesture_unregister_point (action, position);
}
break;
default:
break;
}
if (priv->points->len == 0)
{
g_signal_handler_disconnect (priv->stage, priv->stage_capture_id);
priv->stage_capture_id = 0;
}
return CLUTTER_EVENT_PROPAGATE;
}
static gboolean
actor_captured_event_cb (ClutterActor *actor,
ClutterEvent *event,
ClutterGestureAction *action)
{
ClutterGestureActionPrivate *priv = action->priv;
GesturePoint *point G_GNUC_UNUSED;
if ((clutter_event_type (event) != CLUTTER_BUTTON_PRESS) &&
(clutter_event_type (event) != CLUTTER_TOUCH_BEGIN))
return CLUTTER_EVENT_PROPAGATE;
if (!clutter_actor_meta_get_enabled (CLUTTER_ACTOR_META (action)))
return CLUTTER_EVENT_PROPAGATE;
point = gesture_register_point (action, event);
if (priv->stage == NULL)
priv->stage = clutter_actor_get_stage (actor);
if (priv->stage_capture_id == 0)
priv->stage_capture_id =
g_signal_connect_after (priv->stage, "captured-event",
G_CALLBACK (stage_captured_event_cb),
action);
/* Start the gesture immediately if the gesture has no
* _TRIGGER_EDGE_AFTER drag threshold. */
if ((priv->points->len >= priv->requested_nb_points) &&
(priv->edge != CLUTTER_GESTURE_TRIGGER_EDGE_AFTER))
begin_gesture (action, actor);
return CLUTTER_EVENT_PROPAGATE;
}
static void
clutter_gesture_action_set_actor (ClutterActorMeta *meta,
ClutterActor *actor)
{
ClutterGestureActionPrivate *priv = CLUTTER_GESTURE_ACTION (meta)->priv;
ClutterActorMetaClass *meta_class =
CLUTTER_ACTOR_META_CLASS (clutter_gesture_action_parent_class);
if (priv->actor_capture_id != 0)
{
ClutterActor *old_actor = clutter_actor_meta_get_actor (meta);
if (old_actor != NULL)
g_signal_handler_disconnect (old_actor, priv->actor_capture_id);
priv->actor_capture_id = 0;
}
if (priv->stage_capture_id != 0)
{
if (priv->stage != NULL)
g_signal_handler_disconnect (priv->stage, priv->stage_capture_id);
priv->stage_capture_id = 0;
priv->stage = NULL;
}
if (actor != NULL)
{
priv->actor_capture_id =
g_signal_connect (actor, "captured-event",
G_CALLBACK (actor_captured_event_cb),
meta);
}
meta_class->set_actor (meta, actor);
}
static gboolean
default_event_handler (ClutterGestureAction *action,
ClutterActor *actor)
{
return TRUE;
}
static void
clutter_gesture_action_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
ClutterGestureAction *self = CLUTTER_GESTURE_ACTION (gobject);
switch (prop_id)
{
case PROP_N_TOUCH_POINTS:
clutter_gesture_action_set_n_touch_points (self, g_value_get_int (value));
break;
case PROP_THRESHOLD_TRIGGER_EDGE:
clutter_gesture_action_set_threshold_trigger_edge (self, g_value_get_enum (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_gesture_action_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
ClutterGestureAction *self = CLUTTER_GESTURE_ACTION (gobject);
switch (prop_id)
{
case PROP_N_TOUCH_POINTS:
g_value_set_int (value, self->priv->requested_nb_points);
break;
case PROP_THRESHOLD_TRIGGER_EDGE:
g_value_set_enum (value, self->priv->edge);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_gesture_action_finalize (GObject *gobject)
{
ClutterGestureActionPrivate *priv = CLUTTER_GESTURE_ACTION (gobject)->priv;
g_array_unref (priv->points);
G_OBJECT_CLASS (clutter_gesture_action_parent_class)->finalize (gobject);
}
static void
clutter_gesture_action_class_init (ClutterGestureActionClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
ClutterActorMetaClass *meta_class = CLUTTER_ACTOR_META_CLASS (klass);
gobject_class->finalize = clutter_gesture_action_finalize;
gobject_class->set_property = clutter_gesture_action_set_property;
gobject_class->get_property = clutter_gesture_action_get_property;
meta_class->set_actor = clutter_gesture_action_set_actor;
klass->gesture_begin = default_event_handler;
klass->gesture_progress = default_event_handler;
klass->gesture_prepare = default_event_handler;
/**
* ClutterGestureAction:n-touch-points:
*
* Number of touch points to trigger a gesture action.
*
* Since: 1.16
*/
gesture_props[PROP_N_TOUCH_POINTS] =
g_param_spec_int ("n-touch-points",
P_("Number touch points"),
P_("Number of touch points"),
1, G_MAXINT, 1,
CLUTTER_PARAM_READWRITE);
/**
* ClutterGestureAction:threshold-trigger-edge:
*
* The trigger edge to be used by the action to either emit the
* #ClutterGestureAction::gesture-begin signal or to emit the
* #ClutterGestureAction::gesture-cancel signal.
*
* Since: 1.18
*/
gesture_props[PROP_THRESHOLD_TRIGGER_EDGE] =
g_param_spec_enum ("threshold-trigger-edge",
P_("Threshold Trigger Edge"),
P_("The trigger edge used by the action"),
CLUTTER_TYPE_GESTURE_TRIGGER_EDGE,
CLUTTER_GESTURE_TRIGGER_EDGE_NONE,
CLUTTER_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY);
g_object_class_install_properties (gobject_class,
PROP_LAST,
gesture_props);
/**
* ClutterGestureAction::gesture-begin:
* @action: the #ClutterGestureAction that emitted the signal
* @actor: the #ClutterActor attached to the @action
*
* The ::gesture_begin signal is emitted when the #ClutterActor to which
* a #ClutterGestureAction has been applied starts receiving a gesture.
*
* Return value: %TRUE if the gesture should start, and %FALSE if
* the gesture should be ignored.
*
* Since: 1.8
*/
gesture_signals[GESTURE_BEGIN] =
g_signal_new (I_("gesture-begin"),
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (ClutterGestureActionClass, gesture_begin),
_clutter_boolean_continue_accumulator, NULL,
_clutter_marshal_BOOLEAN__OBJECT,
G_TYPE_BOOLEAN, 1,
CLUTTER_TYPE_ACTOR);
/**
* ClutterGestureAction::gesture-progress:
* @action: the #ClutterGestureAction that emitted the signal
* @actor: the #ClutterActor attached to the @action
*
* The ::gesture-progress signal is emitted for each motion event after
* the #ClutterGestureAction::gesture-begin signal has been emitted.
*
* Return value: %TRUE if the gesture should continue, and %FALSE if
* the gesture should be cancelled.
*
* Since: 1.8
*/
gesture_signals[GESTURE_PROGRESS] =
g_signal_new (I_("gesture-progress"),
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (ClutterGestureActionClass, gesture_progress),
_clutter_boolean_continue_accumulator, NULL,
_clutter_marshal_BOOLEAN__OBJECT,
G_TYPE_BOOLEAN, 1,
CLUTTER_TYPE_ACTOR);
/**
* ClutterGestureAction::gesture-end:
* @action: the #ClutterGestureAction that emitted the signal
* @actor: the #ClutterActor attached to the @action
*
* The ::gesture-end signal is emitted at the end of the gesture gesture,
* when the pointer's button is released
*
* This signal is emitted if and only if the #ClutterGestureAction::gesture-begin
* signal has been emitted first.
*
* Since: 1.8
*/
gesture_signals[GESTURE_END] =
g_signal_new (I_("gesture-end"),
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (ClutterGestureActionClass, gesture_end),
NULL, NULL,
_clutter_marshal_VOID__OBJECT,
G_TYPE_NONE, 1,
CLUTTER_TYPE_ACTOR);
/**
* ClutterGestureAction::gesture-cancel:
* @action: the #ClutterGestureAction that emitted the signal
* @actor: the #ClutterActor attached to the @action
*
* The ::gesture-cancel signal is emitted when the ongoing gesture gets
* cancelled from the #ClutterGestureAction::gesture-progress signal handler.
*
* This signal is emitted if and only if the #ClutterGestureAction::gesture-begin
* signal has been emitted first.
*
* Since: 1.8
*/
gesture_signals[GESTURE_CANCEL] =
g_signal_new (I_("gesture-cancel"),
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (ClutterGestureActionClass, gesture_cancel),
NULL, NULL,
_clutter_marshal_VOID__OBJECT,
G_TYPE_NONE, 1,
CLUTTER_TYPE_ACTOR);
}
static void
clutter_gesture_action_init (ClutterGestureAction *self)
{
self->priv = clutter_gesture_action_get_instance_private (self);
self->priv->points = g_array_sized_new (FALSE, TRUE, sizeof (GesturePoint), 3);
g_array_set_clear_func (self->priv->points, (GDestroyNotify) gesture_point_unset);
self->priv->requested_nb_points = 1;
self->priv->edge = CLUTTER_GESTURE_TRIGGER_EDGE_NONE;
}
/**
* clutter_gesture_action_new:
*
* Creates a new #ClutterGestureAction instance.
*
* Return value: the newly created #ClutterGestureAction
*
* Since: 1.8
*/
ClutterAction *
clutter_gesture_action_new (void)
{
return g_object_new (CLUTTER_TYPE_GESTURE_ACTION, NULL);
}
/**
* clutter_gesture_action_get_press_coords:
* @action: a #ClutterGestureAction
* @point: the touch point index, with 0 being the first touch
* point received by the action
* @press_x: (out) (allow-none): return location for the press
* event's X coordinate
* @press_y: (out) (allow-none): return location for the press
* event's Y coordinate
*
* Retrieves the coordinates, in stage space, of the press event
* that started the dragging for a specific touch point.
*
* Since: 1.8
*/
void
clutter_gesture_action_get_press_coords (ClutterGestureAction *action,
guint point,
gfloat *press_x,
gfloat *press_y)
{
g_return_if_fail (CLUTTER_IS_GESTURE_ACTION (action));
g_return_if_fail (action->priv->points->len > point);
if (press_x)
*press_x = g_array_index (action->priv->points,
GesturePoint,
point).press_x;
if (press_y)
*press_y = g_array_index (action->priv->points,
GesturePoint,
point).press_y;
}
/**
* clutter_gesture_action_get_motion_coords:
* @action: a #ClutterGestureAction
* @point: the touch point index, with 0 being the first touch
* point received by the action
* @motion_x: (out) (allow-none): return location for the latest motion
* event's X coordinate
* @motion_y: (out) (allow-none): return location for the latest motion
* event's Y coordinate
*
* Retrieves the coordinates, in stage space, of the latest motion
* event during the dragging.
*
* Since: 1.8
*/
void
clutter_gesture_action_get_motion_coords (ClutterGestureAction *action,
guint point,
gfloat *motion_x,
gfloat *motion_y)
{
g_return_if_fail (CLUTTER_IS_GESTURE_ACTION (action));
g_return_if_fail (action->priv->points->len > point);
if (motion_x)
*motion_x = g_array_index (action->priv->points,
GesturePoint,
point).last_motion_x;
if (motion_y)
*motion_y = g_array_index (action->priv->points,
GesturePoint,
point).last_motion_y;
}
/**
* clutter_gesture_action_get_motion_delta:
* @action: a #ClutterGestureAction
* @point: the touch point index, with 0 being the first touch
* point received by the action
* @delta_x: (out) (allow-none): return location for the X axis
* component of the incremental motion delta
* @delta_y: (out) (allow-none): return location for the Y axis
* component of the incremental motion delta
*
* Retrieves the incremental delta since the last motion event
* during the dragging.
*
* Return value: the distance since last motion event
*
* Since: 1.12
*/
gfloat
clutter_gesture_action_get_motion_delta (ClutterGestureAction *action,
guint point,
gfloat *delta_x,
gfloat *delta_y)
{
gfloat d_x, d_y;
g_return_val_if_fail (CLUTTER_IS_GESTURE_ACTION (action), 0);
g_return_val_if_fail (action->priv->points->len > point, 0);
d_x = g_array_index (action->priv->points,
GesturePoint,
point).last_delta_x;
d_y = g_array_index (action->priv->points,
GesturePoint,
point).last_delta_y;
if (delta_x)
*delta_x = d_x;
if (delta_y)
*delta_y = d_y;
return sqrt ((d_x * d_x) + (d_y * d_y));
}
/**
* clutter_gesture_action_get_release_coords:
* @action: a #ClutterGestureAction
* @point: the touch point index, with 0 being the first touch
* point received by the action
* @release_x: (out) (allow-none): return location for the X coordinate of
* the last release
* @release_y: (out) (allow-none): return location for the Y coordinate of
* the last release
*
* Retrieves the coordinates, in stage space, where the touch point was
* last released.
*
* Since: 1.8
*/
void
clutter_gesture_action_get_release_coords (ClutterGestureAction *action,
guint point,
gfloat *release_x,
gfloat *release_y)
{
g_return_if_fail (CLUTTER_IS_GESTURE_ACTION (action));
g_return_if_fail (action->priv->points->len > point);
if (release_x)
*release_x = g_array_index (action->priv->points,
GesturePoint,
point).release_x;
if (release_y)
*release_y = g_array_index (action->priv->points,
GesturePoint,
point).release_y;
}
/**
* clutter_gesture_action_get_velocity:
* @action: a #ClutterGestureAction
* @point: the touch point index, with 0 being the first touch
* point received by the action
* @velocity_x: (out) (allow-none): return location for the latest motion
* event's X velocity
* @velocity_y: (out) (allow-none): return location for the latest motion
* event's Y velocity
*
* Retrieves the velocity, in stage pixels per millisecond, of the
* latest motion event during the dragging.
*
* Since: 1.12
*/
gfloat
clutter_gesture_action_get_velocity (ClutterGestureAction *action,
guint point,
gfloat *velocity_x,
gfloat *velocity_y)
{
gfloat d_x, d_y, distance, velocity;
gint64 d_t;
g_return_val_if_fail (CLUTTER_IS_GESTURE_ACTION (action), 0);
g_return_val_if_fail (action->priv->points->len > point, 0);
distance = clutter_gesture_action_get_motion_delta (action, point,
&d_x, &d_y);
d_t = g_array_index (action->priv->points,
GesturePoint,
point).last_delta_time;
if (velocity_x)
*velocity_x = d_t > FLOAT_EPSILON ? d_x / d_t : 0;
if (velocity_y)
*velocity_y = d_t > FLOAT_EPSILON ? d_y / d_t : 0;
velocity = d_t > FLOAT_EPSILON ? distance / d_t : 0;
return velocity;
}
/**
* clutter_gesture_action_get_n_touch_points:
* @action: a #ClutterGestureAction
*
* Retrieves the number of requested points to trigger the gesture.
*
* Return value: the number of points to trigger the gesture.
*
* Since: 1.12
*/
gint
clutter_gesture_action_get_n_touch_points (ClutterGestureAction *action)
{
g_return_val_if_fail (CLUTTER_IS_GESTURE_ACTION (action), 0);
return action->priv->requested_nb_points;
}
/**
* clutter_gesture_action_set_n_touch_points:
* @action: a #ClutterGestureAction
* @nb_points: a number of points
*
* Sets the number of points needed to trigger the gesture.
*
* Since: 1.12
*/
void
clutter_gesture_action_set_n_touch_points (ClutterGestureAction *action,
gint nb_points)
{
ClutterGestureActionPrivate *priv;
g_return_if_fail (CLUTTER_IS_GESTURE_ACTION (action));
g_return_if_fail (nb_points >= 1);
priv = action->priv;
if (priv->requested_nb_points == nb_points)
return;
priv->requested_nb_points = nb_points;
if (priv->in_gesture)
{
if (priv->points->len < priv->requested_nb_points)
cancel_gesture (action);
}
else if (priv->edge == CLUTTER_GESTURE_TRIGGER_EDGE_AFTER)
{
if (priv->points->len >= priv->requested_nb_points)
{
ClutterActor *actor =
clutter_actor_meta_get_actor (CLUTTER_ACTOR_META (action));
gint i, drag_threshold;
drag_threshold = gesture_get_threshold ();
for (i = 0; i < priv->points->len; i++)
{
GesturePoint *point = &g_array_index (priv->points, GesturePoint, i);
if ((ABS (point->press_y - point->last_motion_y) >= drag_threshold) ||
(ABS (point->press_x - point->last_motion_x) >= drag_threshold))
{
begin_gesture (action, actor);
break;
}
}
}
}
g_object_notify_by_pspec (G_OBJECT (action),
gesture_props[PROP_N_TOUCH_POINTS]);
}
/**
* clutter_gesture_action_get_n_current_points:
* @action: a #ClutterGestureAction
*
* Retrieves the number of points currently active.
*
* Return value: the number of points currently active.
*
* Since: 1.12
*/
guint
clutter_gesture_action_get_n_current_points (ClutterGestureAction *action)
{
g_return_val_if_fail (CLUTTER_IS_GESTURE_ACTION (action), 0);
return action->priv->points->len;
}
/**
* clutter_gesture_action_get_sequence:
* @action: a #ClutterGestureAction
* @point: index of a point currently active
*
* Retrieves the #ClutterEventSequence of a touch point.
*
* Return value: (transfer none): the #ClutterEventSequence of a touch point.
*
* Since: 1.12
*/
ClutterEventSequence *
clutter_gesture_action_get_sequence (ClutterGestureAction *action,
guint point)
{
g_return_val_if_fail (CLUTTER_IS_GESTURE_ACTION (action), NULL);
g_return_val_if_fail (action->priv->points->len > point, NULL);
return g_array_index (action->priv->points, GesturePoint, point).sequence;
}
/**
* clutter_gesture_action_get_device:
* @action: a #ClutterGestureAction
* @point: the touch point index, with 0 being the first touch
* point received by the action
*
* Retrieves the #ClutterInputDevice of a touch point.
*
* Return value: (transfer none): the #ClutterInputDevice of a touch point.
*
* Since: 1.12
*/
ClutterInputDevice *
clutter_gesture_action_get_device (ClutterGestureAction *action,
guint point)
{
g_return_val_if_fail (CLUTTER_IS_GESTURE_ACTION (action), NULL);
g_return_val_if_fail (action->priv->points->len > point, NULL);
return g_array_index (action->priv->points, GesturePoint, point).device;
}
/**
* clutter_gesture_action_get_last_event:
* @action: a #ClutterGestureAction
* @point: index of a point currently active
*
* Retrieves a reference to the last #ClutterEvent for a touch point. Call
* clutter_event_copy() if you need to store the reference somewhere.
*
* Return value: (transfer none): the last #ClutterEvent for a touch point.
*
* Since: 1.14
*/
const ClutterEvent *
clutter_gesture_action_get_last_event (ClutterGestureAction *action,
guint point)
{
GesturePoint *gesture_point;
g_return_val_if_fail (CLUTTER_IS_GESTURE_ACTION (action), NULL);
g_return_val_if_fail (action->priv->points->len > point, NULL);
gesture_point = &g_array_index (action->priv->points, GesturePoint, point);
return gesture_point->last_event;
}
/**
* clutter_gesture_action_cancel:
* @action: a #ClutterGestureAction
*
* Cancel a #ClutterGestureAction before it begins
*
* Since: 1.12
*/
void
clutter_gesture_action_cancel (ClutterGestureAction *action)
{
g_return_if_fail (CLUTTER_IS_GESTURE_ACTION (action));
cancel_gesture (action);
}
/**
* clutter_gesture_action_set_threshold_trigger_edge:
* @action: a #ClutterGestureAction
* @edge: the %ClutterGestureTriggerEdge
*
* Sets the edge trigger for the gesture drag threshold, if any.
*
* This function should only be called by sub-classes of
* #ClutterGestureAction during their construction phase.
*
* Since: 1.18
*/
void
clutter_gesture_action_set_threshold_trigger_edge (ClutterGestureAction *action,
ClutterGestureTriggerEdge edge)
{
g_return_if_fail (CLUTTER_IS_GESTURE_ACTION (action));
if (action->priv->edge == edge)
return;
action->priv->edge = edge;
g_object_notify_by_pspec (G_OBJECT (action), gesture_props[PROP_THRESHOLD_TRIGGER_EDGE]);
}
/**
* clutter_gesture_action_get_threshold_trigger_egde:
* @action: a #ClutterGestureAction
*
* Retrieves the edge trigger of the gesture @action, as set using
* clutter_gesture_action_set_threshold_trigger_edge().
*
* Return value: the edge trigger
*
* Since: 1.18
*/
ClutterGestureTriggerEdge
clutter_gesture_action_get_threshold_trigger_egde (ClutterGestureAction *action)
{
g_return_val_if_fail (CLUTTER_IS_GESTURE_ACTION (action),
CLUTTER_GESTURE_TRIGGER_EDGE_NONE);
return action->priv->edge;
}
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