ash/wm/gestures/shelf_gesture_handler.cc

   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/gestures/shelf_gesture_handler.h"
   6
   7 #include "ash/root_window_controller.h"
   8 #include "ash/session/session_state_delegate.h"
   9 #include "ash/shelf/shelf_layout_manager.h"
  10 #include "ash/shelf/shelf_types.h"
  11 #include "ash/shelf/shelf_widget.h"
  12 #include "ash/shell.h"
  13 #include "ash/system/status_area_widget.h"
  14 #include "ash/wm/window_state.h"
  15 #include "ash/wm/window_util.h"
  16 #include "ui/aura/window.h"
  17 #include "ui/compositor/layer.h"
  18 #include "ui/compositor/scoped_layer_animation_settings.h"
  19 #include "ui/gfx/transform.h"
  20 #include "ui/views/widget/widget.h"
  21
  22 namespace ash {
  23
  24 ShelfGestureHandler::ShelfGestureHandler()
  25     : drag_in_progress_(false) {
  26 }
  27
  28 ShelfGestureHandler::~ShelfGestureHandler() {
  29 }
  30
  31 bool ShelfGestureHandler::ProcessGestureEvent(const ui::GestureEvent& event) {
  32   Shell* shell = Shell::GetInstance();
  33   if (!shell->session_state_delegate()->NumberOfLoggedInUsers() ||
  34       shell->session_state_delegate()->IsScreenLocked()) {
  35     // The gestures are disabled in the lock/login screen.
  36     return false;
  37   }
  38
  39   // TODO(oshima): Find the root window controller from event's location.
  40   RootWindowController* controller = Shell::GetPrimaryRootWindowController();
  41
  42   ShelfLayoutManager* shelf = controller->GetShelfLayoutManager();
  43
  44   if (event.type() == ui::ET_GESTURE_WIN8_EDGE_SWIPE) {
  45     shelf->OnGestureEdgeSwipe(event);
  46     return true;
  47   }
  48
  49   const aura::Window* fullscreen = controller->GetWindowForFullscreenMode();
  50   if (fullscreen &&
  51       ash::wm::GetWindowState(fullscreen)->hide_shelf_when_fullscreen()) {
  52     return false;
  53   }
  54
  55   if (event.type() == ui::ET_GESTURE_SCROLL_BEGIN) {
  56     drag_in_progress_ = true;
  57     shelf->StartGestureDrag(event);
  58     return true;
  59   }
  60
  61   if (!drag_in_progress_)
  62     return false;
  63
  64   if (event.type() == ui::ET_GESTURE_SCROLL_UPDATE) {
  65     shelf->UpdateGestureDrag(event);
  66     return true;
  67   }
  68
  69   drag_in_progress_ = false;
  70
  71   if (event.type() == ui::ET_GESTURE_SCROLL_END ||
  72       event.type() == ui::ET_SCROLL_FLING_START) {
  73     shelf->CompleteGestureDrag(event);
  74     return true;
  75   }
  76
  77   // Unexpected event. Reset the state and let the event fall through.
  78   shelf->CancelGestureDrag();
  79   return false;
  80 }
  81
  82 }  // namespace ash