Add GtkGestureZoom

This gesture interprets and reports relative scale differences when fed
with events from two different GdkEventSequences.

1 files changed, 69 insertions, 0 deletions

diff --git a/gtk/gtkgesturezoom.h b/gtk/gtkgesturezoom.h
new file mode 100644
index 0000000000..16a03b0370
--- /dev/null
+++ b/gtk/gtkgesturezoom.h
@@ -0,0 +1,69 @@
+/* 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>
+ */
+#ifndef __GTK_GESTURE_ZOOM_H__
+#define __GTK_GESTURE_ZOOM_H__
+
+#if !defined (__GTK_H_INSIDE__) && !defined (GTK_COMPILATION)
+#error "Only <gtk/gtk.h> can be included directly."
+#endif
+
+#include <gtk/gtkgesture.h>
+#include <gtk/gtk.h>
+
+G_BEGIN_DECLS
+
+#define GTK_TYPE_GESTURE_ZOOM         (gtk_gesture_zoom_get_type ())
+#define GTK_GESTURE_ZOOM(o)           (G_TYPE_CHECK_INSTANCE_CAST ((o), GTK_TYPE_GESTURE_ZOOM, GtkGestureZoom))
+#define GTK_GESTURE_ZOOM_CLASS(k)     (G_TYPE_CHECK_CLASS_CAST ((k), GTK_TYPE_GESTURE_ZOOM, GtkGestureZoomClass))
+#define GTK_IS_GESTURE_ZOOM(o)        (G_TYPE_CHECK_INSTANCE_TYPE ((o), GTK_TYPE_GESTURE_ZOOM))
+#define GTK_IS_GESTURE_ZOOM_CLASS(k)  (G_TYPE_CHECK_CLASS_TYPE ((k), GTK_TYPE_GESTURE_ZOOM))
+#define GTK_GESTURE_ZOOM_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), GTK_TYPE_GESTURE_ZOOM, GtkGestureZoomClass))
+
+typedef struct _GtkGestureZoom GtkGestureZoom;
+typedef struct _GtkGestureZoomClass GtkGestureZoomClass;
+
+struct _GtkGestureZoom
+{
+  GtkGesture parent_instance;
+};
+
+struct _GtkGestureZoomClass
+{
+  GtkGestureClass parent_class;
+
+  void (* scale_changed) (GtkGestureZoom *gesture,
+                          gdouble         scale);
+  /*< private >*/
+  gpointer padding[10];
+};
+
+GDK_AVAILABLE_IN_3_14
+GType        gtk_gesture_zoom_get_type        (void) G_GNUC_CONST;
+
+GDK_AVAILABLE_IN_3_14
+GtkGesture * gtk_gesture_zoom_new             (GtkWidget      *widget);
+
+GDK_AVAILABLE_IN_3_14
+gboolean     gtk_gesture_zoom_get_scale_delta (GtkGestureZoom *gesture,
+                                               gdouble        *scale);
+
+G_END_DECLS
+
+#endif /* __GTK_GESTURE_ZOOM_H__ */