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      1 // Copyright 2013 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/shelf/shelf_bezel_event_filter.h"
      6 
      7 #include "ash/shelf/shelf_layout_manager.h"
      8 #include "ash/shell.h"
      9 #include "ui/aura/window.h"
     10 #include "ui/wm/core/coordinate_conversion.h"
     11 
     12 namespace ash {
     13 
     14 ShelfBezelEventFilter::ShelfBezelEventFilter(
     15     ShelfLayoutManager* shelf)
     16     : shelf_(shelf),
     17       in_touch_drag_(false) {
     18   Shell::GetInstance()->AddPreTargetHandler(this);
     19 }
     20 
     21 ShelfBezelEventFilter::~ShelfBezelEventFilter() {
     22   Shell::GetInstance()->RemovePreTargetHandler(this);
     23 }
     24 
     25 void ShelfBezelEventFilter::OnGestureEvent(
     26     ui::GestureEvent* event) {
     27   gfx::Point point_in_screen(event->location());
     28   aura::Window* target = static_cast<aura::Window*>(event->target());
     29   ::wm::ConvertPointToScreen(target, &point_in_screen);
     30   gfx::Rect screen =
     31       Shell::GetScreen()->GetDisplayNearestPoint(point_in_screen).bounds();
     32   if ((!screen.Contains(point_in_screen) &&
     33        IsShelfOnBezel(screen, point_in_screen)) ||
     34       in_touch_drag_) {
     35     if (gesture_handler_.ProcessGestureEvent(*event)) {
     36       switch (event->type()) {
     37         case ui::ET_GESTURE_SCROLL_BEGIN:
     38           in_touch_drag_ = true;
     39           break;
     40         case ui::ET_GESTURE_SCROLL_END:
     41         case ui::ET_SCROLL_FLING_START:
     42           in_touch_drag_ = false;
     43           break;
     44         default:
     45           break;
     46       }
     47       event->StopPropagation();
     48     }
     49   }
     50 }
     51 
     52 bool ShelfBezelEventFilter::IsShelfOnBezel(
     53     const gfx::Rect& screen,
     54     const gfx::Point& point) const{
     55   switch (shelf_->GetAlignment()) {
     56     case SHELF_ALIGNMENT_BOTTOM:
     57       if (point.y() >= screen.bottom())
     58         return true;
     59       break;
     60     case SHELF_ALIGNMENT_LEFT:
     61       if (point.x() <= screen.x())
     62         return true;
     63       break;
     64     case SHELF_ALIGNMENT_TOP:
     65       if (point.y() <= screen.y())
     66         return true;
     67       break;
     68     case SHELF_ALIGNMENT_RIGHT:
     69       if (point.x() >= screen.right())
     70         return true;
     71       break;
     72   }
     73   return false;
     74 }
     75 
     76 }  // namespace ash
     77