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gtkgesturerotate: Handle touchpad pinch events

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We let these through in GtkEventController::filter, and handle
these especially on GtkGesture::update.
This commit is contained in:
Carlos Garnacho 2015-07-09 19:34:09 +02:00
parent 068a844930
commit 5f68a2877d
1 changed files with 72 additions and 11 deletions
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83
gtk/gtkgesturerotate.c
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@ -45,6 +45,7 @@ enum {
struct _GtkGestureRotatePrivate
{
gdouble initial_angle;
gdouble accum_touchpad_angle;
};
static guint signals[LAST_SIGNAL] = { 0 };
@ -75,33 +76,52 @@ static gboolean
_gtk_gesture_rotate_get_angle (GtkGestureRotate *rotate,
gdouble *angle)
{
GtkGestureRotatePrivate *priv;
const GdkEvent *last_event;
gdouble x1, y1, x2, y2;
GtkGesture *gesture;
gdouble dx, dy;
GList *sequences;
gesture = GTK_GESTURE (rotate);
priv = gtk_gesture_rotate_get_instance_private (rotate);
if (!gtk_gesture_is_recognized (gesture))
return FALSE;
sequences = gtk_gesture_get_sequences (gesture);
g_assert (sequences && sequences->next);
if (!sequences)
return FALSE;
gtk_gesture_get_point (gesture, sequences->data, &x1, &y1);
gtk_gesture_get_point (gesture, sequences->next->data, &x2, &y2);
g_list_free (sequences);
last_event = gtk_gesture_get_last_event (gesture, sequences->data);
dx = x1 - x2;
dy = y1 - y2;
if (last_event->type == GDK_TOUCHPAD_PINCH &&
(last_event->touchpad_pinch.phase == GDK_TOUCHPAD_GESTURE_PHASE_BEGIN ||
last_event->touchpad_pinch.phase == GDK_TOUCHPAD_GESTURE_PHASE_UPDATE ||
last_event->touchpad_pinch.phase == GDK_TOUCHPAD_GESTURE_PHASE_END))
{
*angle = priv->accum_touchpad_angle;
}
else
{
if (!sequences->next)
return FALSE;
*angle = atan2 (dx, dy);
gtk_gesture_get_point (gesture, sequences->data, &x1, &y1);
gtk_gesture_get_point (gesture, sequences->next->data, &x2, &y2);
g_list_free (sequences);
/* Invert angle */
*angle = (2 * G_PI) - *angle;
dx = x1 - x2;
dy = y1 - y2;
/* And constraint it to 0°-360° */
*angle = fmod (*angle, 2 * G_PI);
*angle = atan2 (dx, dy);
/* Invert angle */
*angle = (2 * G_PI) - *angle;
/* And constraint it to 0°-360° */
*angle = fmod (*angle, 2 * G_PI);
}
return TRUE;
}
@ -143,14 +163,55 @@ gtk_gesture_rotate_update (GtkGesture *gesture,
_gtk_gesture_rotate_check_emit (GTK_GESTURE_ROTATE (gesture));
}
static gboolean
gtk_gesture_rotate_filter_event (GtkEventController *controller,
const GdkEvent *event)
{
/* Let 2-finger touchpad pinch events go through */
if (event->type == GDK_TOUCHPAD_PINCH)
{
if (event->touchpad_pinch.n_fingers == 2)
return FALSE;
else
return TRUE;
}
return GTK_EVENT_CONTROLLER_CLASS (gtk_gesture_rotate_parent_class)->filter_event (controller, event);
}
static gboolean
gtk_gesture_rotate_handle_event (GtkEventController *controller,
const GdkEvent *event)
{
GtkGestureRotate *rotate = GTK_GESTURE_ROTATE (controller);
GtkGestureRotatePrivate *priv;
priv = gtk_gesture_rotate_get_instance_private (rotate);
if (event->type == GDK_TOUCHPAD_PINCH)
{
if (event->touchpad_pinch.phase == GDK_TOUCHPAD_GESTURE_PHASE_BEGIN ||
event->touchpad_pinch.phase == GDK_TOUCHPAD_GESTURE_PHASE_END)
priv->accum_touchpad_angle = 0;
else if (event->touchpad_pinch.phase == GDK_TOUCHPAD_GESTURE_PHASE_UPDATE)
priv->accum_touchpad_angle += event->touchpad_pinch.angle_delta;
}
return GTK_EVENT_CONTROLLER_CLASS (gtk_gesture_rotate_parent_class)->handle_event (controller, event);
}
static void
gtk_gesture_rotate_class_init (GtkGestureRotateClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkEventControllerClass *event_controller_class = GTK_EVENT_CONTROLLER_CLASS (klass);
GtkGestureClass *gesture_class = GTK_GESTURE_CLASS (klass);
object_class->constructor = gtk_gesture_rotate_constructor;
event_controller_class->filter_event = gtk_gesture_rotate_filter_event;
event_controller_class->handle_event = gtk_gesture_rotate_handle_event;
gesture_class->begin = gtk_gesture_rotate_begin;
gesture_class->update = gtk_gesture_rotate_update;