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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "ash/wm/system_gesture_event_filter.h"
      6 
      7 #include "ash/ash_switches.h"
      8 #include "ash/metrics/user_metrics_recorder.h"
      9 #include "ash/shell.h"
     10 #include "ash/touch/touch_uma.h"
     11 #include "ash/wm/gestures/long_press_affordance_handler.h"
     12 #include "ash/wm/gestures/overview_gesture_handler.h"
     13 #include "ash/wm/gestures/shelf_gesture_handler.h"
     14 #include "ui/events/event.h"
     15 #include "ui/events/event_constants.h"
     16 
     17 #if defined(OS_CHROMEOS) && defined(USE_X11)
     18 #include "ui/events/x/touch_factory_x11.h"
     19 #endif
     20 
     21 namespace ash {
     22 
     23 SystemGestureEventFilter::SystemGestureEventFilter()
     24     : long_press_affordance_(new LongPressAffordanceHandler),
     25       overview_gesture_handler_(new OverviewGestureHandler),
     26       shelf_gesture_handler_(new ShelfGestureHandler()) {
     27 }
     28 
     29 SystemGestureEventFilter::~SystemGestureEventFilter() {
     30 }
     31 
     32 void SystemGestureEventFilter::OnMouseEvent(ui::MouseEvent* event) {
     33 #if defined(OS_CHROMEOS) && defined(USE_X11)
     34   if (event->type() == ui::ET_MOUSE_PRESSED && event->native_event() &&
     35       ui::TouchFactory::GetInstance()->IsTouchDevicePresent() &&
     36       Shell::GetInstance()->delegate()) {
     37     Shell::GetInstance()->metrics()->RecordUserMetricsAction(UMA_MOUSE_DOWN);
     38   }
     39 #endif
     40 }
     41 
     42 void SystemGestureEventFilter::OnScrollEvent(ui::ScrollEvent* event) {
     43   if (overview_gesture_handler_ &&
     44       overview_gesture_handler_->ProcessScrollEvent(*event)) {
     45     event->StopPropagation();
     46   }
     47 }
     48 
     49 void SystemGestureEventFilter::OnTouchEvent(ui::TouchEvent* event) {
     50   aura::Window* target = static_cast<aura::Window*>(event->target());
     51   ash::TouchUMA::GetInstance()->RecordTouchEvent(target, *event);
     52 }
     53 
     54 void SystemGestureEventFilter::OnGestureEvent(ui::GestureEvent* event) {
     55   aura::Window* target = static_cast<aura::Window*>(event->target());
     56   ash::TouchUMA::GetInstance()->RecordGestureEvent(target, *event);
     57   long_press_affordance_->ProcessEvent(target, event);
     58 
     59   if (overview_gesture_handler_ &&
     60       overview_gesture_handler_->ProcessGestureEvent(*event)) {
     61     event->StopPropagation();
     62     return;
     63   }
     64 
     65   if (event->type() == ui::ET_GESTURE_WIN8_EDGE_SWIPE &&
     66       shelf_gesture_handler_->ProcessGestureEvent(*event)) {
     67     // Do not stop propagation, since the immersive fullscreen controller may
     68     // need to handle this event.
     69     return;
     70   }
     71 }
     72 
     73 }  // namespace ash
     74