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gtk2/gtk/gtkgesture.c
Carlos Garnacho c773859c99 gesture: Ensure late gestures handling the sequence get the group state 
It might happen that a gesture claims a sequence before any other gesture
in its group even handled a single event from that sequence. In that case,
ensure the state is set accordingly right when the sequence is handled in
those.

The "group" gesture testcase has been updated to observe this behavior.
2014-06-03 15:59:03 +02:00

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/* GTK - The GIMP Toolkit
* Copyright (C) 2012, One Laptop Per Child.
* Copyright (C) 2014, Red Hat, Inc.
*
* 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(s): Carlos Garnacho <carlosg@gnome.org>
*/
/**
* SECTION:gtkgesture
* @Short_description: Base class for gestures
* @Title: GtkGesture
* @See_also: #GtkEventController, #GtkGestureSingle
*
* #GtkGesture is the base object for gesture recognition, although this
* object is quite generalized to serve as a base for multi-touch gestures,
* it is suitable to implement single-touch and pointer-based gestures (using
* the special %NULL #GdkEventSequence value for these).
*
* The number of touches that a #GtkGesture need to be recognized is controlled
* by the #GtkGesture:n-points property, if a gesture is keeping track of less
* or more than that number of sequences, it won't check wether the gesture
* is recognized.
*
* As soon as the gesture has the expected number of touches, the gesture will
* run the #GtkGesture::check signal regularly on input events until the gesture
* is recognized, the criteria to consider a gesture as "recognized" is left to
* #GtkGesture subclasses.
*
* A recognized gesture will then emit the following signals:
* - #GtkGesture::begin when the gesture is recognized.
* - A number of #GtkGesture::update, whenever an input event is processed.
* - #GtkGesture::end when the gesture is no longer recognized.
*
* ## Event propagation
*
* In order to receive events, a gesture needs to either set a propagation phase
* through gtk_event_controller_set_propagation_phase(), or feed those manually
* through gtk_event_controller_handle_event().
*
* In the capture phase, events are propagated from the toplevel down to the
* target widget, and gestures that are attached to containers above the widget
* get a chance to interact with the event before it reaches the target.
*
* After the capture phase, GTK+ emits the traditional #GtkWidget::button-press,
* #GtkWidget::button-release, #GtkWidget::touch-event, etc signals. Gestures
* with the %GTK_PHASE_TARGET phase are fed events from the default #GtkWidget::event
* handlers.
*
* In the bubble phase, events are propagated up from the target widget to the
* toplevel, and gestures that are attached to containers above the widget get
* a chance to interact with events that have not been handled yet.
*
* ## States of a sequence # {#touch-sequence-states}
*
* Whenever input interaction happens, a single event may trigger a cascade of
* #GtkGestures, both across the parents of the widget receiving the
* event and parallelly within an individual widget. It is a responsibility of the
* widgets using those gestures to set the state of touch sequences accordingly
* in order to enable cooperation of gestures around the #GdkEventSequences
* triggering those.
*
* Within a widget, gestures can be grouped through gtk_gesture_group(),
* grouped gestures synchronize the state of sequences, so calling
* gtk_gesture_set_sequence_state() on one will effectively propagate
* the state throughout the group.
*
* By default, all sequences start out in the #GTK_EVENT_SEQUENCE_NONE state,
* sequences in this state trigger the gesture event handler, but event
* propagation will continue unstopped by gestures.
*
* If a sequence enters into the #GTK_EVENT_SEQUENCE_DENIED state, the gesture
* group will effectively ignore the sequence, letting events go unstopped
* through the gesture, but the "slot" will still remain occupied while
* the touch is active.
*
* If a sequence enters in the #GTK_EVENT_SEQUENCE_CLAIMED state, the gesture
* group will grab all interaction on the sequence, by:
* - Setting the same sequence to #GTK_EVENT_SEQUENCE_DENIED on every other gesture
* group within the widget, and every gesture on parent widgets in the propagation
* chain.
* - calling #GtkGesture::cancel on every gesture in widgets underneath in the
* propagation chain.
* - Stopping event propagation after the gesture group handles the event.
*
* Note: if a sequence is set early to #GTK_EVENT_SEQUENCE_CLAIMED on
* #GDK_TOUCH_BEGIN/#GDK_BUTTON_PRESS (so those events are captured before
* reaching the event widget, this implies #GTK_PHASE_CAPTURE), one similar
* event will emulated if the sequence changes to #GTK_EVENT_SEQUENCE_DENIED.
* This way event coherence is preserved before event propagation is unstopped
* again.
*
* Sequence states can't be changed freely, see gtk_gesture_set_sequence_state()
* to know about the possible lifetimes of a #GdkEventSequence.
*/
#include "config.h"
#include "gtkgesture.h"
#include "gtkwidgetprivate.h"
#include "gtkeventcontrollerprivate.h"
#include "gtkgestureprivate.h"
#include "gtktypebuiltins.h"
#include "gtkprivate.h"
#include "gtkmain.h"
#include "gtkintl.h"
typedef struct _GtkGesturePrivate GtkGesturePrivate;
typedef struct _PointData PointData;
enum {
PROP_N_POINTS = 1,
PROP_WINDOW
};
enum {
BEGIN,
END,
UPDATE,
CANCEL,
SEQUENCE_STATE_CHANGED,
N_SIGNALS
};
struct _PointData
{
GdkEvent *event;
gdouble widget_x;
gdouble widget_y;
guint press_handled : 1;
guint state : 2;
};
struct _GtkGesturePrivate
{
GHashTable *points;
GdkEventSequence *last_sequence;
GdkWindow *user_window;
GdkWindow *window;
GdkDevice *device;
GList *group_link;
guint n_points;
guint recognized : 1;
};
static guint signals[N_SIGNALS] = { 0 };
#define BUTTONS_MASK (GDK_BUTTON1_MASK | GDK_BUTTON2_MASK | GDK_BUTTON3_MASK)
GList * _gtk_gesture_get_group_link (GtkGesture *gesture);
G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE (GtkGesture, gtk_gesture, GTK_TYPE_EVENT_CONTROLLER)
static void
gtk_gesture_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkGesturePrivate *priv = gtk_gesture_get_instance_private (GTK_GESTURE (object));
switch (prop_id)
{
case PROP_N_POINTS:
g_value_set_uint (value, priv->n_points);
break;
case PROP_WINDOW:
g_value_set_object (value, priv->user_window);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
gtk_gesture_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkGesturePrivate *priv = gtk_gesture_get_instance_private (GTK_GESTURE (object));
switch (prop_id)
{
case PROP_N_POINTS:
priv->n_points = g_value_get_uint (value);
break;
case PROP_WINDOW:
gtk_gesture_set_window (GTK_GESTURE (object),
g_value_get_object (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
gtk_gesture_finalize (GObject *object)
{
GtkGesturePrivate *priv = gtk_gesture_get_instance_private (GTK_GESTURE (object));
g_hash_table_destroy (priv->points);
G_OBJECT_CLASS (gtk_gesture_parent_class)->finalize (object);
}
static guint
_gtk_gesture_effective_n_points (GtkGesture *gesture)
{
GtkGesturePrivate *priv;
GHashTableIter iter;
guint n_points = 0;
PointData *data;
priv = gtk_gesture_get_instance_private (gesture);
g_hash_table_iter_init (&iter, priv->points);
while (g_hash_table_iter_next (&iter, NULL, (gpointer *) &data))
{
if (data->state == GTK_EVENT_SEQUENCE_DENIED ||
data->event->type == GDK_TOUCH_END ||
data->event->type == GDK_BUTTON_RELEASE)
continue;
n_points++;
}
return n_points;
}
static gboolean
gtk_gesture_check_impl (GtkGesture *gesture)
{
GtkGesturePrivate *priv;
guint n_points;
priv = gtk_gesture_get_instance_private (gesture);
n_points = _gtk_gesture_effective_n_points (gesture);
return n_points == priv->n_points;
}
static void
_gtk_gesture_set_recognized (GtkGesture *gesture,
gboolean recognized,
GdkEventSequence *sequence)
{
GtkGesturePrivate *priv;
priv = gtk_gesture_get_instance_private (gesture);
if (priv->recognized == recognized)
return;
priv->recognized = recognized;
if (recognized)
g_signal_emit (gesture, signals[BEGIN], 0, sequence);
else
g_signal_emit (gesture, signals[END], 0, sequence);
}
static gboolean
_gtk_gesture_do_check (GtkGesture *gesture)
{
GtkGestureClass *gesture_class;
gboolean retval = FALSE;
gesture_class = GTK_GESTURE_GET_CLASS (gesture);
if (!gesture_class->check)
return retval;
retval = gesture_class->check (gesture);
return retval;
}
static gboolean
_gtk_gesture_check_recognized (GtkGesture *gesture,
GdkEventSequence *sequence)
{
GtkGesturePrivate *priv = gtk_gesture_get_instance_private (gesture);
guint current_n_points;
current_n_points = _gtk_gesture_effective_n_points (gesture);
if (priv->recognized &&
(current_n_points != priv->n_points ||
g_hash_table_size (priv->points) != priv->n_points))
_gtk_gesture_set_recognized (gesture, FALSE, sequence);
else if (!priv->recognized &&
current_n_points == priv->n_points &&
g_hash_table_size (priv->points) == priv->n_points &&
_gtk_gesture_do_check (gesture))
_gtk_gesture_set_recognized (gesture, TRUE, sequence);
return priv->recognized;
}
/* Finds the first window pertaining to the controller's widget */
static GdkWindow *
_find_widget_window (GtkGesture *gesture,
GdkWindow *window)
{
GtkWidget *widget, *window_widget;
widget = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture));
while (window)
{
gdk_window_get_user_data (window, (gpointer*) &window_widget);
if (window_widget == widget ||
gtk_widget_get_window (widget) == window)
return window;
window = gdk_window_get_effective_parent (window);
}
return NULL;
}
static void
_update_widget_coordinates (GtkGesture *gesture,
PointData *data)
{
GdkWindow *window, *event_widget_window;
GtkWidget *event_widget, *widget;
GtkAllocation allocation;
gdouble event_x, event_y;
gint wx, wy, x, y;
event_widget = gtk_get_event_widget (data->event);
widget = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture));
event_widget_window = gtk_widget_get_window (event_widget);
gdk_event_get_coords (data->event, &event_x, &event_y);
window = data->event->any.window;
while (window && window != event_widget_window)
{
gdk_window_get_position (window, &wx, &wy);
event_x += wx;
event_y += wy;
window = gdk_window_get_effective_parent (window);
}
if (!window)
return;
if (!gtk_widget_get_has_window (event_widget))
{
gtk_widget_get_allocation (event_widget, &allocation);
event_x -= allocation.x;
event_y -= allocation.y;
}
gtk_widget_translate_coordinates (event_widget, widget,
event_x, event_y, &x, &y);
data->widget_x = x;
data->widget_y = y;
}
static GtkEventSequenceState
gtk_gesture_get_group_state (GtkGesture *gesture,
GdkEventSequence *sequence)
{
GtkEventSequenceState state = GTK_EVENT_SEQUENCE_NONE;
GList *group_elem;
group_elem = g_list_first (_gtk_gesture_get_group_link (gesture));
for (; group_elem; group_elem = group_elem->next)
{
if (group_elem->data == gesture)
continue;
if (!gtk_gesture_handles_sequence (group_elem->data, sequence))
continue;
state = gtk_gesture_get_sequence_state (group_elem->data, sequence);
break;
}
return state;
}
static gboolean
_gtk_gesture_update_point (GtkGesture *gesture,
const GdkEvent *event,
gboolean add)
{
GdkEventSequence *sequence;
GdkWindow *widget_window;
GtkGesturePrivate *priv;
GdkDevice *device;
gboolean existed;
PointData *data;
gdouble x, y;
if (!gdk_event_get_coords (event, &x, &y))
return FALSE;
device = gdk_event_get_device (event);
if (!device)
return FALSE;
priv = gtk_gesture_get_instance_private (gesture);
widget_window = _find_widget_window (gesture, event->any.window);
if (!widget_window)
return FALSE;
if (add)
{
/* If the event happens with the wrong device, or
* on the wrong window, ignore.
*/
if (priv->device && priv->device != device)
return FALSE;
if (priv->window && priv->window != widget_window)
return FALSE;
if (priv->user_window && priv->user_window != widget_window)
return FALSE;
}
else if (!priv->device || !priv->window)
return FALSE;
sequence = gdk_event_get_event_sequence (event);
existed = g_hash_table_lookup_extended (priv->points, sequence,
NULL, (gpointer *) &data);
if (!existed)
{
GtkEventSequenceState group_state;
if (!add)
return FALSE;
if (g_hash_table_size (priv->points) == 0)
{
priv->window = widget_window;
priv->device = device;
}
data = g_new0 (PointData, 1);
g_hash_table_insert (priv->points, sequence, data);
group_state = gtk_gesture_get_group_state (gesture, sequence);
gtk_gesture_set_sequence_state (gesture, sequence, group_state);
}
if (data->event)
gdk_event_free (data->event);
data->event = gdk_event_copy (event);
_update_widget_coordinates (gesture, data);
/* Deny the sequence right away if the expected
* number of points is exceeded, so this sequence
* can be tracked with gtk_gesture_handles_sequence().
*/
if (!existed && g_hash_table_size (priv->points) > priv->n_points)
gtk_gesture_set_sequence_state (gesture, sequence,
GTK_EVENT_SEQUENCE_DENIED);
return TRUE;
}
static void
_gtk_gesture_check_empty (GtkGesture *gesture)
{
GtkGesturePrivate *priv;
priv = gtk_gesture_get_instance_private (gesture);
if (g_hash_table_size (priv->points) == 0)
{
priv->window = NULL;
priv->device = NULL;
}
}
static void
_gtk_gesture_remove_point (GtkGesture *gesture,
const GdkEvent *event)
{
GdkEventSequence *sequence;
GtkGesturePrivate *priv;
GdkDevice *device;
sequence = gdk_event_get_event_sequence (event);
device = gdk_event_get_device (event);
priv = gtk_gesture_get_instance_private (gesture);
if (priv->device != device)
return;
g_hash_table_remove (priv->points, sequence);
_gtk_gesture_check_empty (gesture);
}
static void
_gtk_gesture_cancel_all (GtkGesture *gesture)
{
GdkEventSequence *sequence;
GtkGesturePrivate *priv;
GHashTableIter iter;
priv = gtk_gesture_get_instance_private (gesture);
g_hash_table_iter_init (&iter, priv->points);
while (g_hash_table_iter_next (&iter, (gpointer*) &sequence, NULL))
{
g_signal_emit (gesture, signals[CANCEL], 0, sequence);
g_hash_table_iter_remove (&iter);
_gtk_gesture_check_recognized (gesture, sequence);
}
_gtk_gesture_check_empty (gesture);
}
static gboolean
gesture_within_window (GtkGesture *gesture,
GdkWindow *parent)
{
GdkWindow *window;
GtkWidget *widget;
widget = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture));
window = gtk_widget_get_window (widget);
while (window)
{
if (window == parent)
return TRUE;
window = gdk_window_get_effective_parent (window);
}
return FALSE;
}
static gboolean
gtk_gesture_handle_event (GtkEventController *controller,
const GdkEvent *event)
{
GtkGesture *gesture = GTK_GESTURE (controller);
GdkEventSequence *sequence;
GtkGesturePrivate *priv;
GdkDevice *source_device;
gboolean was_recognized;
source_device = gdk_event_get_source_device (event);
if (!source_device)
return FALSE;
priv = gtk_gesture_get_instance_private (gesture);
sequence = gdk_event_get_event_sequence (event);
was_recognized = gtk_gesture_is_recognized (gesture);
if (gtk_gesture_get_sequence_state (gesture, sequence) != GTK_EVENT_SEQUENCE_DENIED)
priv->last_sequence = sequence;
switch (event->type)
{
case GDK_BUTTON_PRESS:
case GDK_TOUCH_BEGIN:
if (_gtk_gesture_update_point (gesture, event, TRUE) &&
_gtk_gesture_check_recognized (gesture, sequence))
{
PointData *data;
data = g_hash_table_lookup (priv->points, sequence);
/* If the sequence was claimed early, the press event will be consumed */
if (gtk_gesture_get_sequence_state (gesture, sequence) == GTK_EVENT_SEQUENCE_CLAIMED)
data->press_handled = TRUE;
}
break;
case GDK_BUTTON_RELEASE:
case GDK_TOUCH_END:
if (_gtk_gesture_update_point (gesture, event, FALSE))
{
if (was_recognized &&
_gtk_gesture_check_recognized (gesture, sequence))
g_signal_emit (gesture, signals[UPDATE], 0, sequence);
_gtk_gesture_remove_point (gesture, event);
}
break;
case GDK_MOTION_NOTIFY:
if ((event->motion.state & BUTTONS_MASK) == 0)
break;
if (event->motion.is_hint)
gdk_event_request_motions (&event->motion);
/* Fall through */
case GDK_TOUCH_UPDATE:
if (_gtk_gesture_update_point (gesture, event, FALSE) &&
_gtk_gesture_check_recognized (gesture, sequence))
g_signal_emit (gesture, signals[UPDATE], 0, sequence);
break;
case GDK_TOUCH_CANCEL:
_gtk_gesture_cancel_sequence (gesture, sequence);
break;
case GDK_GRAB_BROKEN:
if (!event->grab_broken.grab_window ||
!gesture_within_window (gesture, event->grab_broken.grab_window))
_gtk_gesture_cancel_all (gesture);
return FALSE;
default:
/* Unhandled event */
return FALSE;
}
if (gtk_gesture_get_sequence_state (gesture, sequence) != GTK_EVENT_SEQUENCE_CLAIMED)
return FALSE;
return priv->recognized;
}
static void
gtk_gesture_reset (GtkEventController *controller)
{
_gtk_gesture_cancel_all (GTK_GESTURE (controller));
}
static void
gtk_gesture_class_init (GtkGestureClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkEventControllerClass *controller_class = GTK_EVENT_CONTROLLER_CLASS (klass);
object_class->get_property = gtk_gesture_get_property;
object_class->set_property = gtk_gesture_set_property;
object_class->finalize = gtk_gesture_finalize;
controller_class->handle_event = gtk_gesture_handle_event;
controller_class->reset = gtk_gesture_reset;
klass->check = gtk_gesture_check_impl;
/**
* GtkGesture:n-points:
*
* The number of touch points that trigger recognition on this gesture,
*
*
* Since: 3.14
*/
g_object_class_install_property (object_class,
PROP_N_POINTS,
g_param_spec_uint ("n-points",
P_("Number of points"),
P_("Number of points needed "
"to trigger the gesture"),
1, G_MAXUINT, 1,
GTK_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY));
/**
* GtkGesture:window:
*
* If non-%NULL, the gesture will only listen for events that happen on
* this #GdkWindow, or a child of it.
*
* Since: 3.14
*/
g_object_class_install_property (object_class,
PROP_WINDOW,
g_param_spec_object ("window",
P_("GdkWindow to receive events about"),
P_("GdkWindow to receive events about"),
GDK_TYPE_WINDOW,
GTK_PARAM_READWRITE));
/**
* GtkGesture::begin:
* @gesture: the object which received the signal
* @sequence: the #GdkEventSequence that made the gesture to be recognized
*
* This signal is emitted when the gesture is recognized. This means the
* number of touch sequences matches #GtkGesture:n-points, and the #GtkGesture::check
* handler(s) returned #TRUE.
*
* Note: These conditions may also happen when an extra touch (eg. a third touch
* on a 2-touches gesture) is lifted, in that situation @sequence won't pertain
* to the current set of active touches, so don't rely on this being true.
*
* Since: 3.14
*/
signals[BEGIN] =
g_signal_new ("begin",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkGestureClass, begin),
NULL, NULL, NULL,
G_TYPE_NONE, 1, GDK_TYPE_EVENT_SEQUENCE);
/**
* GtkGesture::end:
* @gesture: the object which received the signal
* @sequence: the #GdkEventSequence that made gesture recognition to finish
*
* This signal is emitted when @gesture either stopped recognizing the event
* sequences as something to be handled (the #GtkGesture::check handler returned
* %FALSE), or the number of touch sequences became higher or lower than
* #GtkGesture:n-points.
*
* Note: @sequence might not pertain to the group of sequences that were
* previously triggering recognition on @gesture (ie. a just pressed touch
* sequence that exceeds #GtkGesture:n-points). This situation may be detected
* by checking through gtk_gesture_handles_sequence().
*
* Since: 3.14
*/
signals[END] =
g_signal_new ("end",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkGestureClass, end),
NULL, NULL, NULL,
G_TYPE_NONE, 1, GDK_TYPE_EVENT_SEQUENCE);
/**
* GtkGesture::update:
* @gesture: the object which received the signal
* @sequence: the #GdkEventSequence that was updated
*
* This signal is emitted whenever an event is handled while the gesture is
* recognized. @sequence is guaranteed to pertain to the set of active touches.
*
* Since: 3.14
*/
signals[UPDATE] =
g_signal_new ("update",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkGestureClass, update),
NULL, NULL, NULL,
G_TYPE_NONE, 1, GDK_TYPE_EVENT_SEQUENCE);
/**
* GtkGesture::cancel:
* @gesture: the object which received the signal
* @sequence: the #GdkEventSequence that was cancelled
*
* This signal is emitted whenever a sequence is cancelled. This usually
* happens on active touches when gtk_event_controller_reset() is called
* on @gesture (manually, due to grabs...), or the individual @sequence
* was claimed by parent widgets' controllers (see gtk_gesture_set_sequence_state()).
*
* @gesture must forget everything about @sequence as a reaction to this signal.
*
* Since: 3.14
*/
signals[CANCEL] =
g_signal_new ("cancel",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkGestureClass, cancel),
NULL, NULL, NULL,
G_TYPE_NONE, 1, GDK_TYPE_EVENT_SEQUENCE);
/**
* GtkGesture::sequence-state-changed:
* @gesture: the object which received the signal
* @sequence: the #GdkEventSequence that was cancelled
* @state: the new sequence state
*
* This signal is emitted whenever a sequence state changes. See
* gtk_gesture_set_sequence_state() to know more about the expectable
* sequence lifetimes.
*
* Since: 3.14
*/
signals[SEQUENCE_STATE_CHANGED] =
g_signal_new ("sequence-state-changed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkGestureClass, sequence_state_changed),
NULL, NULL, NULL,
G_TYPE_NONE, 2, GDK_TYPE_EVENT_SEQUENCE,
GTK_TYPE_EVENT_SEQUENCE_STATE);
}
static void
gtk_gesture_init (GtkGesture *gesture)
{
GtkGesturePrivate *priv;
priv = gtk_gesture_get_instance_private (gesture);
priv->points = g_hash_table_new_full (NULL, NULL, NULL,
(GDestroyNotify) g_free);
gtk_event_controller_set_event_mask (GTK_EVENT_CONTROLLER (gesture),
GDK_TOUCH_MASK);
priv->group_link = g_list_prepend (NULL, gesture);
}
/**
* gtk_gesture_get_device:
* @gesture: a #GtkGesture
*
* Returns the master #GdkDevice that is currently operating
* on @gesture, or %NULL if the gesture is not being interacted.
*
* Returns: (transfer none) (allow-none): a #GdkDevice, or %NULL
*
* Since: 3.14
**/
GdkDevice *
gtk_gesture_get_device (GtkGesture *gesture)
{
GtkGesturePrivate *priv;
g_return_val_if_fail (GTK_IS_GESTURE (gesture), NULL);
priv = gtk_gesture_get_instance_private (gesture);
return priv->device;
}
/**
* gtk_gesture_get_sequence_state:
* @gesture: a #GtkGesture
* @sequence: a #GdkEventSequence
*
* Returns the @sequence state, as seen by @gesture.
*
* Returns: The sequence state in @gesture
*
* Since: 3.14
**/
GtkEventSequenceState
gtk_gesture_get_sequence_state (GtkGesture *gesture,
GdkEventSequence *sequence)
{
GtkGesturePrivate *priv;
PointData *data;
g_return_val_if_fail (GTK_IS_GESTURE (gesture),
GTK_EVENT_SEQUENCE_NONE);
priv = gtk_gesture_get_instance_private (gesture);
data = g_hash_table_lookup (priv->points, sequence);
if (!data)
return GTK_EVENT_SEQUENCE_NONE;
return data->state;
}
/**
* gtk_gesture_set_sequence_state:
* @gesture: a #GtkGesture
* @sequence: a #GdkEventSequence
* @state: the sequence state
*
* Sets the state of @sequence in @gesture. Sequences start
* in state #GTK_EVENT_SEQUENCE_NONE, and whenever they change
* state, they can never go back to that state. Likewise,
* sequences in state #GTK_EVENT_SEQUENCE_DENIED cannot turn
* back to a not denied state. With these rules, the lifetime
* of an event sequence is constrained to the next four:
*
* * None
* * None → Denied
* * None → Claimed
* * None → Claimed → Denied
*
* Returns: %TRUE if @sequence is handled by @gesture,
* and the state is changed successfully
*
* Since: 3.14
**/
gboolean
gtk_gesture_set_sequence_state (GtkGesture *gesture,
GdkEventSequence *sequence,
GtkEventSequenceState state)
{
GtkGesturePrivate *priv;
PointData *data;
g_return_val_if_fail (GTK_IS_GESTURE (gesture), FALSE);
g_return_val_if_fail (state >= GTK_EVENT_SEQUENCE_NONE &&
state <= GTK_EVENT_SEQUENCE_DENIED, FALSE);
priv = gtk_gesture_get_instance_private (gesture);
data = g_hash_table_lookup (priv->points, sequence);
if (!data)
return FALSE;
if (data->state == state)
return FALSE;
/* denied sequences remain denied */
if (data->state == GTK_EVENT_SEQUENCE_DENIED)
return FALSE;
/* Sequences can't go from claimed/denied to none */
if (state == GTK_EVENT_SEQUENCE_NONE &&
data->state != GTK_EVENT_SEQUENCE_NONE)
return FALSE;
data->state = state;
g_signal_emit (gesture, signals[SEQUENCE_STATE_CHANGED], 0,
sequence, state);
if (state == GTK_EVENT_SEQUENCE_DENIED)
_gtk_gesture_check_recognized (gesture, sequence);
return TRUE;
}
/**
* gtk_gesture_set_state:
* @gesture: a #GtkGesture
* @state: the sequence state
*
* Sets the state of all sequences that @gesture is currently
* interacting with. See gtk_gesture_set_sequence_state()
* for more details on sequence states.
*
* Returns: %TRUE if the state of at least one sequence
* was changed successfully
*
* Since: 3.14
*/
gboolean
gtk_gesture_set_state (GtkGesture *gesture,
GtkEventSequenceState state)
{
gboolean handled = FALSE;
GtkGesturePrivate *priv;
GList *sequences, *l;
g_return_val_if_fail (GTK_IS_GESTURE (gesture), FALSE);
g_return_val_if_fail (state >= GTK_EVENT_SEQUENCE_NONE &&
state <= GTK_EVENT_SEQUENCE_DENIED, FALSE);
priv = gtk_gesture_get_instance_private (gesture);
sequences = g_hash_table_get_keys (priv->points);
for (l = sequences; l; l = l->next)
handled |= gtk_gesture_set_sequence_state (gesture, l->data, state);
g_list_free (sequences);
return handled;
}
/**
* gtk_gesture_get_sequences:
* @gesture: a #GtkGesture
*
* Returns the list of #GdkEventSequences currently being interpreted
* by @gesture.
*
* Returns: (transfer container) (element-type GdkEventSequence): A list
* of #GdkEventSequences, the list elements are owned by GTK+
* and must not be freed or modified, the list itself must be deleted
* through g_list_free()
*
* Since: 3.14
**/
GList *
gtk_gesture_get_sequences (GtkGesture *gesture)
{
GdkEventSequence *sequence;
GtkGesturePrivate *priv;
GList *sequences = NULL;
GHashTableIter iter;
PointData *data;
g_return_val_if_fail (GTK_IS_GESTURE (gesture), NULL);
priv = gtk_gesture_get_instance_private (gesture);
g_hash_table_iter_init (&iter, priv->points);
while (g_hash_table_iter_next (&iter, (gpointer *) &sequence, (gpointer *) &data))
{
if (data->state == GTK_EVENT_SEQUENCE_DENIED)
continue;
if (data->event->type == GDK_TOUCH_END ||
data->event->type == GDK_BUTTON_RELEASE)
continue;
sequences = g_list_prepend (sequences, sequence);
}
return sequences;
}
/**
* gtk_gesture_get_last_updated_sequence:
* @gesture: a #GtkGesture
*
* Returns the #GdkEventSequence that was last updated on @gesture.
*
* Returns: The last updated sequence
*
* Since: 3.14
**/
GdkEventSequence *
gtk_gesture_get_last_updated_sequence (GtkGesture *gesture)
{
GtkGesturePrivate *priv;
g_return_val_if_fail (GTK_IS_GESTURE (gesture), NULL);
priv = gtk_gesture_get_instance_private (gesture);
return priv->last_sequence;
}
/**
* gtk_gesture_get_last_event:
* @gesture: a #GtkGesture
* @sequence: a #GdkEventSequence
*
* Returns the last event that was processed for @sequence.
*
* Returns: (transfer none): The last event from @sequence
**/
const GdkEvent *
gtk_gesture_get_last_event (GtkGesture *gesture,
GdkEventSequence *sequence)
{
GtkGesturePrivate *priv;
PointData *data;
g_return_val_if_fail (GTK_IS_GESTURE (gesture), NULL);
priv = gtk_gesture_get_instance_private (gesture);
data = g_hash_table_lookup (priv->points, sequence);
if (!data)
return NULL;
return data->event;
}
/**
* gtk_gesture_get_point:
* @gesture: a #GtkGesture
* @sequence: (allow-none): a #GdkEventSequence, or %NULL for pointer events
* @x: (out) (allow-none): return location for X axis of the sequence coordinates
* @y: (out) (allow-none): return location for Y axis of the sequence coordinates
*
* If @sequence is currently being interpreted by @gesture, this
* function returns %TRUE and fills in @x and @y with the last coordinates
* stored for that event sequence. The coordinates are always relative to the
* widget allocation.
*
* Returns: %TRUE if @sequence is currently interpreted
*
* Since: 3.14
**/
gboolean
gtk_gesture_get_point (GtkGesture *gesture,
GdkEventSequence *sequence,
gdouble *x,
gdouble *y)
{
GtkGesturePrivate *priv;
PointData *data;
g_return_val_if_fail (GTK_IS_GESTURE (gesture), FALSE);
priv = gtk_gesture_get_instance_private (gesture);
if (!g_hash_table_lookup_extended (priv->points, sequence,
NULL, (gpointer *) &data))
return FALSE;
if (x)
*x = data->widget_x;
if (y)
*y = data->widget_y;
return TRUE;
}
gboolean
_gtk_gesture_get_last_update_time (GtkGesture *gesture,
GdkEventSequence *sequence,
guint32 *evtime)
{
GtkGesturePrivate *priv;
PointData *data;
g_return_val_if_fail (GTK_IS_GESTURE (gesture), FALSE);
priv = gtk_gesture_get_instance_private (gesture);
if (!g_hash_table_lookup_extended (priv->points, sequence,
NULL, (gpointer *) &data))
return FALSE;
if (evtime)
*evtime = gdk_event_get_time (data->event);
return TRUE;
};
/**
* gtk_gesture_get_bounding_box:
* @gesture: a #GtkGesture
* @rect: (out): bounding box containing all active touches.
*
* If there are touch sequences being currently handled by @gesture,
* this function returns %TRUE and fills in @rect with the bounding
* box containing all active touches. Otherwise, %FALSE will be
* returned.
*
* Returns: %TRUE if there are active touches, %FALSE otherwise
*
* Since: 3.14
**/
gboolean
gtk_gesture_get_bounding_box (GtkGesture *gesture,
GdkRectangle *rect)
{
GtkGesturePrivate *priv;
gdouble x1, y1, x2, y2;
GHashTableIter iter;
guint n_points = 0;
PointData *data;
g_return_val_if_fail (GTK_IS_GESTURE (gesture), FALSE);
g_return_val_if_fail (rect != NULL, FALSE);
priv = gtk_gesture_get_instance_private (gesture);
x1 = y1 = G_MAXDOUBLE;
x2 = y2 = -G_MAXDOUBLE;
g_hash_table_iter_init (&iter, priv->points);
while (g_hash_table_iter_next (&iter, NULL, (gpointer *) &data))
{
gdouble x, y;
if (data->state == GTK_EVENT_SEQUENCE_DENIED)
continue;
if (data->event->type == GDK_TOUCH_END ||
data->event->type == GDK_BUTTON_RELEASE)
continue;
gdk_event_get_coords (data->event, &x, &y);
n_points++;
x1 = MIN (x1, x);
y1 = MIN (y1, y);
x2 = MAX (x2, x);
y2 = MAX (y2, y);
}
if (n_points == 0)
return FALSE;
rect->x = x1;
rect->y = y1;
rect->width = x2 - x1;
rect->height = y2 - y1;
return TRUE;
}
/**
* gtk_gesture_get_bounding_box_center:
* @gesture: a #GtkGesture
* @x: (out): X coordinate for the bounding box center
* @y: (out): Y coordinate for the bounding box center
*
* If there are touch sequences being currently handled by @gesture,
* this function returns %TRUE and fills in @x and @y with the center
* of the bounding box containing all active touches. Otherwise, %FALSE
* will be returned.
*
* Returns: %FALSE if no active touches are present, %TRUE otherwise
*
* Since: 3.14
**/
gboolean
gtk_gesture_get_bounding_box_center (GtkGesture *gesture,
gdouble *x,
gdouble *y)
{
GdkRectangle rect;
g_return_val_if_fail (GTK_IS_GESTURE (gesture), FALSE);
g_return_val_if_fail (x != NULL && y != NULL, FALSE);
if (!gtk_gesture_get_bounding_box (gesture, &rect))
return FALSE;
*x = rect.x + rect.width / 2;
*y = rect.y + rect.height / 2;
return TRUE;
}
/**
* gtk_gesture_is_active:
* @gesture: a #GtkGesture
*
* Returns %TRUE if the gesture is currently active.
* A gesture is active meanwhile there are touch sequences
* interacting with it.
*
* Returns: %TRUE if gesture is active
*
* Since: 3.14
**/
gboolean
gtk_gesture_is_active (GtkGesture *gesture)
{
g_return_val_if_fail (GTK_IS_GESTURE (gesture), FALSE);
return _gtk_gesture_effective_n_points (gesture) != 0;
}
/**
* gtk_gesture_is_recognized:
* @gesture: a #GtkGesture
*
* Returns %TRUE if the gesture is currently recognized.
* A gesture is recognized if there are as many interacting
* touch sequences as required by @gesture, and #GtkGesture::check
* returned %TRUE for the sequences being currently interpreted.
*
* Returns: %TRUE if gesture is recognized
*
* Since: 3.14
**/
gboolean
gtk_gesture_is_recognized (GtkGesture *gesture)
{
GtkGesturePrivate *priv;
g_return_val_if_fail (GTK_IS_GESTURE (gesture), FALSE);
priv = gtk_gesture_get_instance_private (gesture);
return priv->recognized;
}
gboolean
_gtk_gesture_check (GtkGesture *gesture)
{
GtkGesturePrivate *priv;
g_return_val_if_fail (GTK_IS_GESTURE (gesture), FALSE);
priv = gtk_gesture_get_instance_private (gesture);
return _gtk_gesture_check_recognized (gesture, priv->last_sequence);
}
/**
* gtk_gesture_handles_sequence:
* @gesture: a #GtkGesture
* @sequence: a #GdkEventSequence
*
* Returns %TRUE if @gesture is currently handling events corresponding to
* @sequence.
*
* Returns: %TRUE if @gesture is handling @sequence
*
* Since: 3.14
**/
gboolean
gtk_gesture_handles_sequence (GtkGesture *gesture,
GdkEventSequence *sequence)
{
GtkGesturePrivate *priv;
PointData *data;
g_return_val_if_fail (GTK_IS_GESTURE (gesture), FALSE);
priv = gtk_gesture_get_instance_private (gesture);
data = g_hash_table_lookup (priv->points, sequence);
if (!data)
return FALSE;
if (data->state == GTK_EVENT_SEQUENCE_DENIED)
return FALSE;
return TRUE;
}
gboolean
_gtk_gesture_cancel_sequence (GtkGesture *gesture,
GdkEventSequence *sequence)
{
GtkGesturePrivate *priv;
PointData *data;
g_return_val_if_fail (GTK_IS_GESTURE (gesture), FALSE);
priv = gtk_gesture_get_instance_private (gesture);
data = g_hash_table_lookup (priv->points, sequence);
if (!data)
return FALSE;
g_signal_emit (gesture, signals[CANCEL], 0, sequence);
_gtk_gesture_check_recognized (gesture, sequence);
_gtk_gesture_remove_point (gesture, data->event);
return TRUE;
}
/**
* gtk_gesture_get_window:
* @gesture: a #GtkGesture
*
* Returns the user-defined window that receives the events
* handled by @gesture. See gtk_gesture_set_window() for more
* information.
*
* Returns: (transfer none) (allow-none): the user defined window, or %NULL if none
*
* Since: 3.14
**/
GdkWindow *
gtk_gesture_get_window (GtkGesture *gesture)
{
GtkGesturePrivate *priv;
g_return_val_if_fail (GTK_IS_GESTURE (gesture), NULL);
priv = gtk_gesture_get_instance_private (gesture);
return priv->user_window;
}
/**
* gtk_gesture_set_window:
* @gesture: a #GtkGesture
* @window: (allow-none): a #GdkWindow, or %NULL
*
* Sets a specific window to receive events about, so @gesture
* will effectively handle only events targeting @window, or
* a child of it. @window must pertain to gtk_event_controller_get_widget().
*
* Since: 3.14
**/
void
gtk_gesture_set_window (GtkGesture *gesture,
GdkWindow *window)
{
GtkGesturePrivate *priv;
g_return_if_fail (GTK_IS_GESTURE (gesture));
g_return_if_fail (!window || GDK_IS_WINDOW (window));
priv = gtk_gesture_get_instance_private (gesture);
if (window)
{
GtkWidget *window_widget;
gdk_window_get_user_data (window, (gpointer*) &window_widget);
g_return_if_fail (window_widget ==
gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture)));
}
if (priv->user_window == window)
return;
priv->user_window = window;
g_object_notify (G_OBJECT (gesture), "window");
}
GList *
_gtk_gesture_get_group_link (GtkGesture *gesture)
{
GtkGesturePrivate *priv;
priv = gtk_gesture_get_instance_private (gesture);
return priv->group_link;
}
/**
* gtk_gesture_group:
* @gesture: a #GtkGesture
* @group_gesture: #GtkGesture to group @gesture with
*
* Adds @gesture to the same group than @group_gesture. Gestures
* are by default isolated in their own groups.
*
* When gestures are grouped, the state of #GdkEventSequences
* is kept in sync for all of those, so calling gtk_gesture_set_sequence_state(),
* on one will transfer the same value to the others.
*
* Groups also perform an "implicit grabbing" of sequences, if a
* #GdkEventSequence state is set to #GTK_EVENT_SEQUENCE_CLAIMED on one group,
* every other gesture group attached to the same #GtkWidget will switch the
* state for that sequence to #GTK_EVENT_SEQUENCE_DENIED.
*
* Since: 3.14
**/
void
gtk_gesture_group (GtkGesture *gesture,
GtkGesture *group_gesture)
{
GList *link, *group_link, *next;
g_return_if_fail (GTK_IS_GESTURE (gesture));
g_return_if_fail (GTK_IS_GESTURE (group_gesture));
g_return_if_fail (gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (group_gesture)) ==
gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture)));
link = _gtk_gesture_get_group_link (gesture);
if (link->prev || link->next)
{
if (gtk_gesture_is_grouped_with (gesture, group_gesture))
return;
gtk_gesture_ungroup (gesture);
}
group_link = _gtk_gesture_get_group_link (group_gesture);
next = group_link->next;
/* Rewire link so it's inserted after the group_gesture elem */
link->prev = group_link;
link->next = next;
group_link->next = link;
if (next)
next->prev = link;
}
/**
* gtk_gesture_ungroup:
* @gesture: a #GtkGesture
*
* Separates @gesture into an isolated group.
*
* Since: 3.14
**/
void
gtk_gesture_ungroup (GtkGesture *gesture)
{
GList *link, *prev, *next;
g_return_if_fail (GTK_IS_GESTURE (gesture));
link = _gtk_gesture_get_group_link (gesture);
prev = link->prev;
next = link->next;
/* Detach link from the group chain */
if (prev)
prev->next = next;
if (next)
next->prev = prev;
link->next = link->prev = NULL;
}
/**
* gtk_gesture_get_group:
* @gesture: a #GtkGesture
*
* Returns all gestures in the group of @gesture
*
* Returns: (element-type GtkGesture) (transfer container): The list
* of #GtkGestures, free with g_list_free()
*
* Since: 3.14
**/
GList *
gtk_gesture_get_group (GtkGesture *gesture)
{
GList *link;
g_return_val_if_fail (GTK_IS_GESTURE (gesture), NULL);
link = _gtk_gesture_get_group_link (gesture);
return g_list_copy (g_list_first (link));
}
/**
* gtk_gesture_is_grouped_with:
* @gesture: a #GtkGesture
* @other: another #GtkGesture
*
* Returns %TRUE if both gestures pertain to the same group.
*
* Returns: whether the gestures are grouped
*
* Since: 3.14
**/
gboolean
gtk_gesture_is_grouped_with (GtkGesture *gesture,
GtkGesture *other)
{
GList *link;
g_return_val_if_fail (GTK_IS_GESTURE (gesture), FALSE);
g_return_val_if_fail (GTK_IS_GESTURE (other), FALSE);
link = _gtk_gesture_get_group_link (gesture);
link = g_list_first (link);
return g_list_find (link, other) != NULL;
}
gboolean
_gtk_gesture_handled_sequence_press (GtkGesture *gesture,
GdkEventSequence *sequence)
{
GtkGesturePrivate *priv;
PointData *data;
g_return_val_if_fail (GTK_IS_GESTURE (gesture), FALSE);
priv = gtk_gesture_get_instance_private (gesture);
data = g_hash_table_lookup (priv->points, sequence);
if (!data)
return FALSE;
return data->press_handled;
}
gboolean
_gtk_gesture_get_pointer_emulating_sequence (GtkGesture *gesture,
GdkEventSequence **sequence)
{
GtkGesturePrivate *priv;
GdkEventSequence *seq;
GHashTableIter iter;
PointData *data;
g_return_val_if_fail (GTK_IS_GESTURE (gesture), FALSE);
priv = gtk_gesture_get_instance_private (gesture);
g_hash_table_iter_init (&iter, priv->points);
while (g_hash_table_iter_next (&iter, (gpointer*) &seq, (gpointer*) &data))
{
switch (data->event->type)
{
case GDK_TOUCH_BEGIN:
case GDK_TOUCH_UPDATE:
case GDK_TOUCH_END:
if (!data->event->touch.emulating_pointer)
continue;
/* Fall through */
case GDK_BUTTON_PRESS:
case GDK_BUTTON_RELEASE:
case GDK_MOTION_NOTIFY:
*sequence = seq;
return TRUE;
default:
break;
}
}
return FALSE;
}
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