src/ash/shelf/shelf_bezel_event_filter.cc

   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 "ash/wm/coordinate_conversion.h"
  10 #include "ui/aura/window.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