gtk: translate unhandled touch events to button events

We don't want to fallback for 'random' touch sequences, since
that could lead to all kinds of pairedness and other violations.
Since the X server already tells us what touch events it would
have used for emulating pointer events, we just use that information
here.

diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 1330a4512369d6a1c22058c46de54a84ece575a4..c7406fc882701a3e6de16de9f3bfd9cd01c6308e 100644 (file)
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -588,6 +588,8 @@ static gboolean             gtk_widget_real_focus_in_event           (GtkWidget       *widget,
                                                                  GdkEventFocus   *event);
 static gboolean                gtk_widget_real_focus_out_event         (GtkWidget        *widget,
                                                                 GdkEventFocus    *event);
+static gboolean         gtk_widget_real_touch_event             (GtkWidget        *widget,
+                                                                 GdkEventTouch    *event);
 static gboolean                gtk_widget_real_focus                   (GtkWidget        *widget,
                                                                 GtkDirectionType  direction);
 static void             gtk_widget_real_move_focus              (GtkWidget        *widget,
@@ -903,6 +905,7 @@ gtk_widget_class_init (GtkWidgetClass *klass)
   klass->button_press_event = NULL;
   klass->button_release_event = NULL;
   klass->motion_notify_event = NULL;
+  klass->touch_event = gtk_widget_real_touch_event;
   klass->delete_event = NULL;
   klass->destroy_event = NULL;
   klass->key_press_event = gtk_widget_real_key_press_event;
@@ -5840,6 +5843,76 @@ gtk_widget_real_focus_out_event (GtkWidget     *widget,
   return FALSE;
 }
 
+static gboolean
+gtk_widget_real_touch_event (GtkWidget     *widget,
+                             GdkEventTouch *event)
+{
+  GdkEvent *bevent;
+  gboolean return_val;
+  gint signum;
+
+  if (!event->emulating_pointer)
+    return FALSE;
+
+  if (event->type == GDK_TOUCH_BEGIN ||
+      event->type == GDK_TOUCH_END)
+    {
+      GdkEventType type;
+
+      if (event->type == GDK_TOUCH_BEGIN)
+        {
+          type = GDK_BUTTON_PRESS;
+          signum = BUTTON_PRESS_EVENT;
+        }
+      else
+        {
+          type = GDK_BUTTON_RELEASE;
+          signum = BUTTON_RELEASE_EVENT;
+        }
+      bevent = gdk_event_new (type);
+      bevent->any.window = g_object_ref (event->window);
+      bevent->any.send_event = FALSE;
+      bevent->button.time = event->time;
+      bevent->button.state = event->state;
+      bevent->button.button = 1;
+      bevent->button.x_root = event->x_root;
+      bevent->button.y_root = event->y_root;
+      bevent->button.x = event->x;
+      bevent->button.y = event->y;
+      bevent->button.device = event->device;
+      bevent->button.axes = g_memdup (event->axes,
+                                      sizeof (gdouble) * gdk_device_get_n_axes (event->device));
+      gdk_event_set_source_device (bevent, gdk_event_get_source_device ((GdkEvent*)event));
+    }
+  else if (event->type == GDK_TOUCH_UPDATE)
+    {
+      signum = MOTION_NOTIFY_EVENT;
+      bevent = gdk_event_new (GDK_MOTION_NOTIFY);
+      bevent->any.window = g_object_ref (event->window);
+      bevent->any.send_event = FALSE;
+      bevent->motion.time = event->time;
+      bevent->motion.state = event->state;
+      bevent->motion.x_root = event->x_root;
+      bevent->motion.y_root = event->y_root;
+      bevent->motion.x = event->x;
+      bevent->motion.y = event->y;
+      bevent->motion.device = event->device;
+      bevent->motion.is_hint = FALSE;
+      bevent->motion.axes = g_memdup (event->axes,
+                                      sizeof (gdouble) * gdk_device_get_n_axes (event->device));
+      gdk_event_set_source_device (bevent, gdk_event_get_source_device ((GdkEvent*)event));
+    }
+  else
+    return FALSE;
+
+  g_signal_emit (widget, widget_signals[signum], 0, bevent, &return_val);
+
+  gdk_event_free (bevent);
+
+  return return_val;
+}
+
+
 #define WIDGET_REALIZED_FOR_EVENT(widget, event) \
      (event->type == GDK_FOCUS_CHANGE || gtk_widget_get_realized(widget))