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gtkgesturemultipress: Add ::unpaired-release signal

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This signal will be emitted whenever the gesture received a
button release or touch end event without a pairing button
press or touch begin. This usually happens when grabs transfer
input from one widget to another mid-press.

https://bugzilla.gnome.org/show_bug.cgi?id=789163
This commit is contained in:
Carlos Garnacho 2017-11-21 20:14:52 +01:00 committed by Matthias Clasen
parent b8c58f41b6
commit bce91555f5
1 changed files with 56 additions and 0 deletions
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56
gtk/gtkgesturemultipress.c
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@ -60,6 +60,7 @@ enum {
PRESSED,
RELEASED,
STOPPED,
UNPAIRED_RELEASE,
LAST_SIGNAL
};
@ -300,6 +301,35 @@ gtk_gesture_multi_press_reset (GtkEventController *controller)
GTK_EVENT_CONTROLLER_CLASS (gtk_gesture_multi_press_parent_class)->reset (controller);
}
static gboolean
gtk_gesture_multi_press_handle_event (GtkEventController *controller,
const GdkEvent *event)
{
GtkEventControllerClass *parent_controller;
GtkGestureMultiPressPrivate *priv;
GdkEventSequence *sequence;
guint button;
gdouble x, y;
priv = gtk_gesture_multi_press_get_instance_private (GTK_GESTURE_MULTI_PRESS (controller));
parent_controller = GTK_EVENT_CONTROLLER_CLASS (gtk_gesture_multi_press_parent_class);
sequence = gdk_event_get_event_sequence (event);
if (priv->n_presses == 0 &&
!gtk_gesture_handles_sequence (GTK_GESTURE (controller), sequence) &&
(gdk_event_get_event_type (event) == GDK_BUTTON_RELEASE ||
gdk_event_get_event_type (event) == GDK_TOUCH_END))
{
if (!gdk_event_get_button (event, &button))
button = 0;
gdk_event_get_coords (event, &x, &y);
g_signal_emit (controller, signals[UNPAIRED_RELEASE], 0,
x, y, button, sequence);
}
return parent_controller->handle_event (controller, event);
}
static void
gtk_gesture_multi_press_class_init (GtkGestureMultiPressClass *klass)
{
@ -316,6 +346,7 @@ gtk_gesture_multi_press_class_init (GtkGestureMultiPressClass *klass)
gesture_class->cancel = gtk_gesture_multi_press_cancel;
controller_class->reset = gtk_gesture_multi_press_reset;
controller_class->handle_event = gtk_gesture_multi_press_handle_event;
/**
* GtkGestureMultiPress::pressed:
@ -375,6 +406,31 @@ gtk_gesture_multi_press_class_init (GtkGestureMultiPressClass *klass)
G_STRUCT_OFFSET (GtkGestureMultiPressClass, stopped),
NULL, NULL, NULL,
G_TYPE_NONE, 0);
/**
* GtkGestureMultiPress::unpaired-release
* @gesture: the object which received the signal
* @x: X coordinate of the event
* @y: Y coordinate of the event
* @button: Button being released
* @sequence: Sequence being released
*
* This signal is emitted whenever the gesture receives a release
* event that had no previous corresponding press. Due to implicit
* grabs, this can only happen on situations where input is grabbed
* elsewhere mid-press or the pressed widget voluntarily relinquishes
* its implicit grab.
*
* Since: 3.93.
*/
signals[UNPAIRED_RELEASE] =
g_signal_new (I_("unpaired-release"),
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
0, NULL, NULL, NULL,
G_TYPE_NONE, 4,
G_TYPE_DOUBLE, G_TYPE_DOUBLE,
G_TYPE_UINT, GDK_TYPE_EVENT_SEQUENCE);
}
static void