GTK: First cut at tab dragging automation....

chrome/browser/automation/ui_controls_linux.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/automation/ui_controls.h"
 
 #include <gtk/gtk.h>
 #include <gdk/gdkkeysyms.h>
 
 #include "base/gfx/rect.h"
@@ skipping 40 matching lines @@
       MessageLoop::current()->PostTask(FROM_HERE, task_);
       delete this;
     }
   }
 
   virtual void DidProcessEvent(GdkEvent* event) {
     // No-op.
   }
 
  private:
-  // We pass ownership of task_ to MessageLoop when the corrent event is
+  // We pass ownership of task_ to MessageLoop when the current event is
   // received.
-  Task *task_;
+  Task* task_;
   GdkEventType type_;
   // The number of events of this type to wait for.
   int count_;
 };
 
 class ClickTask : public Task {
  public:
   ClickTask(ui_controls::MouseButton button, int state, Task* followup)
       : button_(button), state_(state), followup_(followup)  {
   }
 
   virtual ~ClickTask() {}
 
   virtual void Run() {
     if (followup_)
       ui_controls::SendMouseEventsNotifyWhenDone(button_, state_, followup_);
     else
       ui_controls::SendMouseEvents(button_, state_);
   }
 
  private:
   ui_controls::MouseButton button_;
   int state_;
   Task* followup_;
 };
 
-
 bool SendKeyEvent(GdkWindow* window, bool press, guint key, guint state) {
   GdkEvent* event = gdk_event_new(press ? GDK_KEY_PRESS : GDK_KEY_RELEASE);
 
   event->key.type = press ? GDK_KEY_PRESS : GDK_KEY_RELEASE;
   event->key.window = window;
   g_object_ref(event->key.window);
   event->key.send_event = false;
   event->key.time = EventTimeNow();
 
   event->key.state = state;
   event->key.keyval = key;
 
   GdkKeymapKey* keys;
   gint n_keys;
   if (!gdk_keymap_get_entries_for_keyval(gdk_keymap_get_default(),
                                          event->key.keyval, &keys, &n_keys)) {
     return false;
   }
   event->key.hardware_keycode = keys[0].keycode;
   event->key.group = keys[0].group;
   g_free(keys);
 
   gdk_event_put(event);
   // gdk_event_put appends a copy of the event.
   gdk_event_free(event);
   return true;
 }
 
+void FakeAMouseMotionEvent(gint x, gint y) {
+  GdkEvent* event = gdk_event_new(GDK_MOTION_NOTIFY);
+
+  event->motion.send_event = false;
+  event->motion.time = EventTimeNow();
+
+  GtkWidget* grab_widget = gtk_grab_get_current();
+  if (grab_widget) {
+    // If there is a grab, we need to target all events at it regardless of
+    // what widget the mouse is over.
+    event->motion.window = grab_widget->window;
+  } else {
+    event->motion.window = gdk_window_at_pointer(&x, &y);
+  }
+  g_object_ref(event->motion.window);
+  event->motion.x = x;
+  event->motion.y = y;
+  gint origin_x, origin_y;
+  gdk_window_get_origin(event->motion.window, &origin_x, &origin_y);
+  event->motion.x_root = x + origin_x;
+  event->motion.y_root = y + origin_y;
+
+  event->motion.device = gdk_device_get_core_pointer();
+  event->type = GDK_MOTION_NOTIFY;
+
+  gdk_event_put(event);
+  gdk_event_free(event);
+}
+
 }  // namespace
 
 namespace ui_controls {
 
 bool SendKeyPress(gfx::NativeWindow window,
                   wchar_t key, bool control, bool shift, bool alt) {
   GdkWindow* event_window = NULL;
   GtkWidget* grab_widget = gtk_grab_get_current();
   if (grab_widget) {
     // If there is a grab, send all events to the grabbed widget.
@@ skipping 69 matching lines @@
   if (alt)
     release_count++;
   // This object will delete itself after running |task|.
   new EventWaiter(task, GDK_KEY_RELEASE, release_count);
   return SendKeyPress(window, key, control, shift, alt);
 }
 
 bool SendMouseMove(long x, long y) {
   gdk_display_warp_pointer(gdk_display_get_default(), gdk_screen_get_default(),
                            x, y);
+  // Sometimes gdk_display_warp_pointer fails to send back any indication of
+  // the move, even though it succesfully moves the server cursor. We fake it in
+  // order to get drags to work.
+  FakeAMouseMotionEvent(x, y);
+
   return true;
 }
 
 bool SendMouseMoveNotifyWhenDone(long x, long y, Task* task) {
   bool rv = SendMouseMove(x, y);
   // We can't rely on any particular event signalling the completion of the
-  // mouse move. Posting the task to the message loop should gaurantee
+  // mouse move. Posting the task to the message loop hopefully guarantees
   // the pointer has moved before task is run (although it may not run it as
   // soon as it could).
   MessageLoop::current()->PostTask(FROM_HERE, task);
   return rv;
 }
 
 bool SendMouseEvents(MouseButton type, int state) {
   GdkEvent* event = gdk_event_new(GDK_BUTTON_PRESS);
 
   event->button.send_event = false;
   event->button.time = EventTimeNow();
 
   gint x, y;
   GtkWidget* grab_widget = gtk_grab_get_current();
   if (grab_widget) {
     // If there is a grab, we need to target all events at it regardless of
     // what widget the mouse is over.
     event->button.window = grab_widget->window;
     gdk_window_get_pointer(event->button.window, &x, &y, NULL);
   } else {
     event->button.window = gdk_window_at_pointer(&x, &y);
   }
+
   g_object_ref(event->button.window);
-  event->motion.x = x;
-  event->motion.y = y;
+  event->button.x = x;
+  event->button.y = y;
   gint origin_x, origin_y;
   gdk_window_get_origin(event->button.window, &origin_x, &origin_y);
   event->button.x_root = x + origin_x;
   event->button.y_root = y + origin_y;
 
   event->button.axes = NULL;
-  // TODO(estade): as above, we may want to pack this with the actual state.
-  event->button.state = 0;
+  gdk_window_get_pointer(event->button.window, NULL, NULL,
+      reinterpret_cast<GdkModifierType*>(&event->button.state));
   event->button.button = type == LEFT ? 1 : (type == MIDDLE ? 2 : 3);
   event->button.device = gdk_device_get_core_pointer();
 
   event->button.type = GDK_BUTTON_PRESS;
   if (state & DOWN)
     gdk_event_put(event);
 
   // Also send a release event.
   GdkEvent* release_event = gdk_event_copy(event);
   release_event->button.type = GDK_BUTTON_RELEASE;
@@ skipping 42 matching lines @@
                                int state,
                                Task* task) {
   gfx::Rect bounds = gtk_util::GetWidgetScreenBounds(widget);
   SendMouseMoveNotifyWhenDone(bounds.x() + bounds.width() / 2,
                               bounds.y() + bounds.height() / 2,
                               new ClickTask(button, state, task));
 }
 #endif
 
 }  // namespace ui_controls