2013-01-17 20:06:06 +00:00
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/* GTK - The GIMP Toolkit
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* Copyright (C) 2012, One Laptop Per Child.
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* Copyright (C) 2014, Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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* Author(s): Carlos Garnacho <carlosg@gnome.org>
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*/
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2014-04-09 16:28:43 +00:00
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/**
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2021-03-01 06:45:20 +00:00
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* GtkGestureRotate:
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2014-04-09 16:28:43 +00:00
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*
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2021-03-01 06:45:20 +00:00
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* `GtkGestureRotate` is a `GtkGesture` for 2-finger rotations.
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*
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* Whenever the angle between both handled sequences changes, the
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* [signal@Gtk.GestureRotate::angle-changed] signal is emitted.
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2014-04-09 16:28:43 +00:00
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*/
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2013-01-17 20:06:06 +00:00
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#include "config.h"
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#include <math.h>
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2014-05-06 02:40:18 +00:00
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#include "gtkgesturerotate.h"
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#include "gtkgesturerotateprivate.h"
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2013-01-17 20:06:06 +00:00
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#include "gtkmarshalers.h"
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2015-09-12 13:13:00 +00:00
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#include "gtkintl.h"
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2013-01-17 20:06:06 +00:00
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typedef struct _GtkGestureRotatePrivate GtkGestureRotatePrivate;
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enum {
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ANGLE_CHANGED,
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LAST_SIGNAL
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};
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struct _GtkGestureRotatePrivate
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{
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2020-07-24 20:32:16 +00:00
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double initial_angle;
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double accum_touchpad_angle;
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2013-01-17 20:06:06 +00:00
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};
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static guint signals[LAST_SIGNAL] = { 0 };
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G_DEFINE_TYPE_WITH_PRIVATE (GtkGestureRotate, gtk_gesture_rotate, GTK_TYPE_GESTURE)
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static void
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gtk_gesture_rotate_init (GtkGestureRotate *gesture)
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{
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}
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static GObject *
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gtk_gesture_rotate_constructor (GType type,
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guint n_construct_properties,
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GObjectConstructParam *construct_properties)
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{
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GObject *object;
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object = G_OBJECT_CLASS (gtk_gesture_rotate_parent_class)->constructor (type,
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n_construct_properties,
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construct_properties);
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g_object_set (object, "n-points", 2, NULL);
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return object;
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}
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static gboolean
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_gtk_gesture_rotate_get_angle (GtkGestureRotate *rotate,
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2020-07-24 20:32:16 +00:00
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double *angle)
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2013-01-17 20:06:06 +00:00
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{
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2015-07-09 17:34:09 +00:00
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GtkGestureRotatePrivate *priv;
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2020-02-16 16:09:02 +00:00
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GdkEvent *last_event;
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2020-07-24 20:32:16 +00:00
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double x1, y1, x2, y2;
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2013-01-17 20:06:06 +00:00
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GtkGesture *gesture;
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2020-07-24 20:32:16 +00:00
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double dx, dy;
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2019-12-18 21:03:19 +00:00
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GList *sequences = NULL;
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2017-08-26 02:53:58 +00:00
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GdkTouchpadGesturePhase phase;
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2019-12-18 21:03:19 +00:00
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gboolean retval = FALSE;
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2013-01-17 20:06:06 +00:00
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gesture = GTK_GESTURE (rotate);
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2015-07-09 17:34:09 +00:00
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priv = gtk_gesture_rotate_get_instance_private (rotate);
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2013-01-17 20:06:06 +00:00
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if (!gtk_gesture_is_recognized (gesture))
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2019-12-18 21:03:19 +00:00
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goto out;
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2013-01-17 20:06:06 +00:00
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sequences = gtk_gesture_get_sequences (gesture);
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2015-07-09 17:34:09 +00:00
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if (!sequences)
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2019-12-18 21:03:19 +00:00
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goto out;
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2015-07-09 17:34:09 +00:00
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last_event = gtk_gesture_get_last_event (gesture, sequences->data);
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2017-08-26 02:53:58 +00:00
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2021-08-02 21:38:11 +00:00
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if (gdk_event_get_event_type (last_event) == GDK_TOUCHPAD_PINCH)
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2015-07-09 17:34:09 +00:00
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{
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2021-08-02 21:38:11 +00:00
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phase = gdk_touchpad_event_get_gesture_phase (last_event);
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if (phase == GDK_TOUCHPAD_GESTURE_PHASE_CANCEL)
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goto out;
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2015-07-09 17:34:09 +00:00
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*angle = priv->accum_touchpad_angle;
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}
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else
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{
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if (!sequences->next)
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2019-12-18 21:03:19 +00:00
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goto out;
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2013-01-17 20:06:06 +00:00
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2015-07-09 17:34:09 +00:00
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gtk_gesture_get_point (gesture, sequences->data, &x1, &y1);
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gtk_gesture_get_point (gesture, sequences->next->data, &x2, &y2);
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2013-01-17 20:06:06 +00:00
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2015-07-09 17:34:09 +00:00
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dx = x1 - x2;
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dy = y1 - y2;
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2013-01-17 20:06:06 +00:00
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2015-07-09 17:34:09 +00:00
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*angle = atan2 (dx, dy);
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2013-01-17 20:06:06 +00:00
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2015-07-09 17:34:09 +00:00
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/* Invert angle */
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*angle = (2 * G_PI) - *angle;
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2013-01-17 20:06:06 +00:00
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2015-07-09 17:34:09 +00:00
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/* And constraint it to 0°-360° */
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*angle = fmod (*angle, 2 * G_PI);
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}
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2013-01-17 20:06:06 +00:00
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2019-12-18 21:03:19 +00:00
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retval = TRUE;
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out:
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g_list_free (sequences);
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return retval;
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2013-01-17 20:06:06 +00:00
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}
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static gboolean
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_gtk_gesture_rotate_check_emit (GtkGestureRotate *gesture)
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{
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GtkGestureRotatePrivate *priv;
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2020-07-24 20:32:16 +00:00
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double angle, delta;
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2013-01-17 20:06:06 +00:00
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if (!_gtk_gesture_rotate_get_angle (gesture, &angle))
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return FALSE;
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priv = gtk_gesture_rotate_get_instance_private (gesture);
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2014-05-06 09:43:31 +00:00
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delta = angle - priv->initial_angle;
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2013-01-17 20:06:06 +00:00
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2014-05-06 09:43:31 +00:00
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if (delta < 0)
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delta += 2 * G_PI;
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g_signal_emit (gesture, signals[ANGLE_CHANGED], 0, angle, delta);
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2013-01-17 20:06:06 +00:00
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return TRUE;
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}
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static void
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gtk_gesture_rotate_begin (GtkGesture *gesture,
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GdkEventSequence *sequence)
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{
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GtkGestureRotate *rotate = GTK_GESTURE_ROTATE (gesture);
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GtkGestureRotatePrivate *priv;
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priv = gtk_gesture_rotate_get_instance_private (rotate);
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_gtk_gesture_rotate_get_angle (rotate, &priv->initial_angle);
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}
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static void
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gtk_gesture_rotate_update (GtkGesture *gesture,
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GdkEventSequence *sequence)
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{
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_gtk_gesture_rotate_check_emit (GTK_GESTURE_ROTATE (gesture));
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}
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2015-07-09 17:34:09 +00:00
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static gboolean
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gtk_gesture_rotate_filter_event (GtkEventController *controller,
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2020-02-16 16:09:02 +00:00
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GdkEvent *event)
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2015-07-09 17:34:09 +00:00
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{
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/* Let 2-finger touchpad pinch events go through */
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2017-08-25 14:47:11 +00:00
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if (gdk_event_get_event_type (event) == GDK_TOUCHPAD_PINCH)
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2015-07-09 17:34:09 +00:00
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{
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2017-08-26 14:52:25 +00:00
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guint n_fingers;
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2020-02-18 03:11:56 +00:00
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n_fingers = gdk_touchpad_event_get_n_fingers (event);
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2017-08-26 14:52:25 +00:00
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if (n_fingers == 2)
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2015-07-09 17:34:09 +00:00
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return FALSE;
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else
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return TRUE;
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}
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return GTK_EVENT_CONTROLLER_CLASS (gtk_gesture_rotate_parent_class)->filter_event (controller, event);
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}
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static gboolean
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gtk_gesture_rotate_handle_event (GtkEventController *controller,
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2020-02-16 16:09:02 +00:00
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GdkEvent *event,
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2020-02-13 05:08:49 +00:00
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double x,
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double y)
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2015-07-09 17:34:09 +00:00
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{
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GtkGestureRotate *rotate = GTK_GESTURE_ROTATE (controller);
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GtkGestureRotatePrivate *priv;
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2017-08-26 14:52:25 +00:00
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GdkTouchpadGesturePhase phase;
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double delta;
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2015-07-09 17:34:09 +00:00
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priv = gtk_gesture_rotate_get_instance_private (rotate);
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2017-08-25 14:47:11 +00:00
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if (gdk_event_get_event_type (event) == GDK_TOUCHPAD_PINCH)
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2015-07-09 17:34:09 +00:00
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{
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2020-02-18 03:11:56 +00:00
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phase = gdk_touchpad_event_get_gesture_phase (event);
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Restructure the GdkEvent type hierarchy
GdkEvent has been a "I-can't-believe-this-is-not-OOP" type for ages,
using a union of sub-types. This has always been problematic when it
comes to implementing accessor functions: either you get generic API
that takes a GdkEvent and uses a massive switch() to determine which
event types have the data you're looking for; or you create namespaced
accessors, but break language bindings horribly, as boxed types cannot
have derived types.
The recent conversion of GskRenderNode (which had similar issues) to
GTypeInstance, and the fact that GdkEvent is now a completely opaque
type, provide us with the chance of moving GdkEvent to GTypeInstance,
and have sub-types for GdkEvent.
The change from boxed type to GTypeInstance is pretty small, all things
considered, but ends up cascading to a larger commit, as we still have
backends and code in GTK trying to access GdkEvent structures directly.
Additionally, the naming of the public getter functions requires
renaming all the data structures to conform to the namespace/type-name
pattern.
2020-04-16 16:23:36 +00:00
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delta = gdk_touchpad_event_get_pinch_angle_delta (event);
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2017-08-26 14:52:25 +00:00
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if (phase == GDK_TOUCHPAD_GESTURE_PHASE_BEGIN ||
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phase == GDK_TOUCHPAD_GESTURE_PHASE_END)
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2015-07-09 17:34:09 +00:00
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priv->accum_touchpad_angle = 0;
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2017-08-26 14:52:25 +00:00
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else if (phase == GDK_TOUCHPAD_GESTURE_PHASE_UPDATE)
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priv->accum_touchpad_angle += delta;
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2015-07-09 17:34:09 +00:00
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}
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2020-02-13 05:08:49 +00:00
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return GTK_EVENT_CONTROLLER_CLASS (gtk_gesture_rotate_parent_class)->handle_event (controller, event, x, y);
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2015-07-09 17:34:09 +00:00
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}
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2013-01-17 20:06:06 +00:00
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static void
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gtk_gesture_rotate_class_init (GtkGestureRotateClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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2015-07-09 17:34:09 +00:00
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GtkEventControllerClass *event_controller_class = GTK_EVENT_CONTROLLER_CLASS (klass);
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2013-01-17 20:06:06 +00:00
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GtkGestureClass *gesture_class = GTK_GESTURE_CLASS (klass);
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object_class->constructor = gtk_gesture_rotate_constructor;
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2015-07-09 17:34:09 +00:00
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event_controller_class->filter_event = gtk_gesture_rotate_filter_event;
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event_controller_class->handle_event = gtk_gesture_rotate_handle_event;
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2013-01-17 20:06:06 +00:00
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gesture_class->begin = gtk_gesture_rotate_begin;
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gesture_class->update = gtk_gesture_rotate_update;
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/**
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* GtkGestureRotate::angle-changed:
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* @gesture: the object on which the signal is emitted
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* @angle: Current angle in radians
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2014-04-09 16:28:43 +00:00
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* @angle_delta: Difference with the starting angle, in radians
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*
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2021-03-01 06:45:20 +00:00
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* Emitted when the angle between both tracked points changes.
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2013-01-17 20:06:06 +00:00
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*/
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signals[ANGLE_CHANGED] =
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2015-09-12 13:13:00 +00:00
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g_signal_new (I_("angle-changed"),
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2013-01-17 20:06:06 +00:00
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GTK_TYPE_GESTURE_ROTATE,
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G_SIGNAL_RUN_FIRST,
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G_STRUCT_OFFSET (GtkGestureRotateClass, angle_changed),
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2019-06-02 21:07:27 +00:00
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NULL, NULL,
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_gtk_marshal_VOID__DOUBLE_DOUBLE,
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2013-01-17 20:06:06 +00:00
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G_TYPE_NONE, 2, G_TYPE_DOUBLE, G_TYPE_DOUBLE);
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2019-06-02 21:07:27 +00:00
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g_signal_set_va_marshaller (signals[ANGLE_CHANGED],
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G_TYPE_FROM_CLASS (klass),
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_gtk_marshal_VOID__DOUBLE_DOUBLEv);
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2013-01-17 20:06:06 +00:00
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}
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/**
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* gtk_gesture_rotate_new:
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*
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2021-03-01 06:45:20 +00:00
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* Returns a newly created `GtkGesture` that recognizes 2-touch
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2013-01-17 20:06:06 +00:00
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* rotation gestures.
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*
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2021-03-01 06:45:20 +00:00
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* Returns: a newly created `GtkGestureRotate`
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2013-01-17 20:06:06 +00:00
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**/
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GtkGesture *
|
2018-03-08 22:36:41 +00:00
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gtk_gesture_rotate_new (void)
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2013-01-17 20:06:06 +00:00
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{
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return g_object_new (GTK_TYPE_GESTURE_ROTATE,
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NULL);
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}
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/**
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* gtk_gesture_rotate_get_angle_delta:
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2021-03-01 06:45:20 +00:00
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* @gesture: a `GtkGestureRotate`
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*
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* Gets the angle delta in radians.
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2013-01-17 20:06:06 +00:00
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*
|
2014-05-26 12:29:17 +00:00
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* If @gesture is active, this function returns the angle difference
|
2014-05-27 16:45:04 +00:00
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* in radians since the gesture was first recognized. If @gesture is
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* not active, 0 is returned.
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2013-01-17 20:06:06 +00:00
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*
|
2014-05-26 12:29:17 +00:00
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* Returns: the angle delta in radians
|
2021-03-01 06:45:20 +00:00
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*/
|
2020-07-24 20:32:16 +00:00
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double
|
2014-05-26 12:29:17 +00:00
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gtk_gesture_rotate_get_angle_delta (GtkGestureRotate *gesture)
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2013-01-17 20:06:06 +00:00
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{
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GtkGestureRotatePrivate *priv;
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2020-07-24 20:32:16 +00:00
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double angle;
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2013-01-17 20:06:06 +00:00
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2014-05-27 16:45:04 +00:00
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g_return_val_if_fail (GTK_IS_GESTURE_ROTATE (gesture), 0.0);
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2013-01-17 20:06:06 +00:00
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if (!_gtk_gesture_rotate_get_angle (gesture, &angle))
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2014-05-27 16:45:04 +00:00
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return 0.0;
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2013-01-17 20:06:06 +00:00
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priv = gtk_gesture_rotate_get_instance_private (gesture);
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2014-05-26 12:29:17 +00:00
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return angle - priv->initial_angle;
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2013-01-17 20:06:06 +00:00
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}
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