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Add GtkGestureRotate
This gesture implementation recognizes rotations when fed with events from two different GdkEventSequences
This commit is contained in:
Carlos Garnacho
parent
8733e2a918
commit
2495b518c1
@ -282,6 +282,7 @@ gtk_public_h_sources = \
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gtkframe.h \
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gtkgesture.h \
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gtkgesturelongpress.h \
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gtkgesturerotate.h \
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gtkgestureswipe.h \
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gtkgrid.h \
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gtkheaderbar.h \
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@ -777,6 +778,7 @@ gtk_base_c_sources = \
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gtkgladecatalog.c \
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gtkgesture.c \
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gtkgesturelongpress.c \
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gtkgesturerotate.c \
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gtkgestureswipe.c \
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gtkgrid.c \
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gtkheaderbar.c \
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@ -108,6 +108,7 @@
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#include <gtk/gtkframe.h>
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#include <gtk/gtkgesture.h>
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#include <gtk/gtkgesturelongpress.h>
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#include <gtk/gtkgesturerotate.h>
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#include <gtk/gtkgestureswipe.h>
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#include <gtk/gtkgrid.h>
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#include <gtk/gtkheaderbar.h>
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206
gtk/gtkgesturerotate.c
Normal file
206
gtk/gtkgesturerotate.c
Normal file
@ -0,0 +1,206 @@
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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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#include "config.h"
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#include <math.h>
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#include <gtk/gtkgesturerotate.h>
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#include "gtkmarshalers.h"
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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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gdouble initial_angle;
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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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gdouble *angle)
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{
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gdouble x1, y1, x2, y2;
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GtkGesture *gesture;
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gdouble dx, dy;
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GList *sequences;
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gesture = GTK_GESTURE (rotate);
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if (!gtk_gesture_is_recognized (gesture))
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return FALSE;
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sequences = gtk_gesture_get_sequences (gesture);
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g_assert (sequences && sequences->next);
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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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g_list_free (sequences);
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dx = x1 - x2;
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dy = y1 - y2;
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*angle = atan2 (dx, dy);
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/* Invert angle */
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*angle = (2 * G_PI) - *angle;
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/* And constraint it to 0°-360° */
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*angle = fmod (*angle, 2 * G_PI);
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return TRUE;
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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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gdouble angle;
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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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g_signal_emit (gesture, signals[ANGLE_CHANGED], 0,
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angle, angle - priv->initial_angle);
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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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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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GtkGestureClass *gesture_class = GTK_GESTURE_CLASS (klass);
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object_class->constructor = gtk_gesture_rotate_constructor;
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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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* @angle_delta: Difference with the starting angle in radians
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*/
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signals[ANGLE_CHANGED] =
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g_signal_new ("angle-changed",
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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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NULL, NULL, NULL,
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G_TYPE_NONE, 2, G_TYPE_DOUBLE, G_TYPE_DOUBLE);
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}
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/**
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* gtk_gesture_rotate_new:
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* @widget: a #GtkWidget
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*
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* Returns a newly created #GtkGesture that recognizes 2-touch
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* rotation gestures.
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*
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* Returns: a newly created #GtkGestureRotate
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*
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* Since: 3.14
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**/
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GtkGesture *
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gtk_gesture_rotate_new (GtkWidget *widget)
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{
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return g_object_new (GTK_TYPE_GESTURE_ROTATE,
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"widget", widget,
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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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* @gesture: a #GtkGestureRotate
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* @delta: (out) (transfer none): angle delta
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*
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* If @gesture is active, this function returns %TRUE and fills
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* in @delta with the angle difference in radians since the
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* gesture was first recognized.
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*
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* Returns: %TRUE if @controller is recognizing a rotate gesture
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*
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* Since: 3.14
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**/
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gboolean
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gtk_gesture_rotate_get_angle_delta (GtkGestureRotate *gesture,
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gdouble *delta)
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{
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GtkGestureRotatePrivate *priv;
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gdouble angle;
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g_return_val_if_fail (GTK_IS_GESTURE_ROTATE (gesture), FALSE);
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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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if (delta)
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*delta = angle - priv->initial_angle;
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return TRUE;
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}
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70
gtk/gtkgesturerotate.h
Normal file
70
gtk/gtkgesturerotate.h
Normal file
@ -0,0 +1,70 @@
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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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#ifndef __GTK_GESTURE_ROTATE_H__
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#define __GTK_GESTURE_ROTATE_H__
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#if !defined (__GTK_H_INSIDE__) && !defined (GTK_COMPILATION)
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#error "Only <gtk/gtk.h> can be included directly."
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#endif
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#include <gtk/gtkwidget.h>
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#include <gtk/gtkgesture.h>
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G_BEGIN_DECLS
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#define GTK_TYPE_GESTURE_ROTATE (gtk_gesture_rotate_get_type ())
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#define GTK_GESTURE_ROTATE(o) (G_TYPE_CHECK_INSTANCE_CAST ((o), GTK_TYPE_GESTURE_ROTATE, GtkGestureRotate))
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#define GTK_GESTURE_ROTATE_CLASS(k) (G_TYPE_CHECK_CLASS_CAST ((k), GTK_TYPE_GESTURE_ROTATE, GtkGestureRotateClass))
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#define GTK_IS_GESTURE_ROTATE(o) (G_TYPE_CHECK_INSTANCE_TYPE ((o), GTK_TYPE_GESTURE_ROTATE))
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#define GTK_IS_GESTURE_ROTATE_CLASS(k) (G_TYPE_CHECK_CLASS_TYPE ((k), GTK_TYPE_GESTURE_ROTATE))
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#define GTK_GESTURE_ROTATE_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), GTK_TYPE_GESTURE_ROTATE, GtkGestureRotateClass))
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typedef struct _GtkGestureRotate GtkGestureRotate;
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typedef struct _GtkGestureRotateClass GtkGestureRotateClass;
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struct _GtkGestureRotate
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{
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GtkGesture parent_instance;
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};
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struct _GtkGestureRotateClass
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{
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GtkGestureClass parent_class;
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void (* angle_changed) (GtkGestureRotate *gesture,
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gdouble angle,
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gdouble delta);
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/*< private >*/
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gpointer padding[10];
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};
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GDK_AVAILABLE_IN_3_14
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GType gtk_gesture_rotate_get_type (void) G_GNUC_CONST;
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GDK_AVAILABLE_IN_3_14
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GtkGesture * gtk_gesture_rotate_new (GtkWidget *widget);
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GDK_AVAILABLE_IN_3_14
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gboolean gtk_gesture_rotate_get_angle_delta (GtkGestureRotate *gesture,
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gdouble *delta);
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G_END_DECLS
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#endif /* __GTK_GESTURE_ROTATE_H__ */
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