Implementing the dispatch of the swipe gesture for one-finger touch swipes.

ash/wm/toplevel_window_event_handler.cc

 // Copyright (c) 2012 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 "ash/wm/toplevel_window_event_handler.h"
 
 #include "ash/shell.h"
 #include "ash/wm/resize_shadow_controller.h"
 #include "ash/wm/window_resizer.h"
 #include "ash/wm/window_state.h"
@@ skipping 326 matching lines @@
                  kMinHorizVelocityForWindowSwipe) {
         SetWindowStateTypeFromGesture(target,
                                       wm::WINDOW_STATE_TYPE_RIGHT_SNAPPED);
       } else if (event->details().velocity_x() <
                  -kMinHorizVelocityForWindowSwipe) {
         SetWindowStateTypeFromGesture(target,
                                       wm::WINDOW_STATE_TYPE_LEFT_SNAPPED);
       }
       event->StopPropagation();
       return;
-    case ui::ET_GESTURE_MULTIFINGER_SWIPE:
+    case ui::ET_GESTURE_SWIPE:
+      if (event->details().touch_points() <= 1)

[tdresser, 2014/05/26 20:49:58]

I'd split out the invalid case here.

DCHECK(event->details().touch_points() > 0)
if (event->details() == 1)
  return;

[mfomitchev, 2014/05/26 22:07:14]

Done.

+        return;
       if (!wm::GetWindowState(target)->IsNormalOrSnapped())
         return;
 
       CompleteDrag(DRAG_COMPLETE);
 
       if (event->details().swipe_down()) {
         SetWindowStateTypeFromGesture(target, wm::WINDOW_STATE_TYPE_MINIMIZED);
       } else if (event->details().swipe_up()) {
         SetWindowStateTypeFromGesture(target, wm::WINDOW_STATE_TYPE_MAXIMIZED);
       } else if (event->details().swipe_right()) {
@@ skipping 248 matching lines @@
 
 void ToplevelWindowEventHandler::ResizerWindowDestroyed() {
   // We explicitly don't invoke RevertDrag() since that may do things to window.
   // Instead we destroy the resizer.
   window_resizer_.reset();
 
   CompleteDrag(DRAG_REVERT);
 }
 
 }  // namespace ash