src/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_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/gestures/tray_gesture_handler.h"
  15 #include "ash/wm/window_state.h"
  16 #include "ash/wm/window_util.h"
  17 #include "ui/aura/window.h"
  18 #include "ui/compositor/layer.h"
  19 #include "ui/compositor/scoped_layer_animation_settings.h"
  20 #include "ui/gfx/transform.h"
  21 #include "ui/views/widget/widget.h"
  22
  23 namespace ash {
  24 namespace internal {
  25
  26 ShelfGestureHandler::ShelfGestureHandler()
  27     : drag_in_progress_(false) {
  28 }
  29
  30 ShelfGestureHandler::~ShelfGestureHandler() {
  31 }
  32
  33 bool ShelfGestureHandler::ProcessGestureEvent(const ui::GestureEvent& event) {
  34   Shell* shell = Shell::GetInstance();
  35   if (!shell->session_state_delegate()->NumberOfLoggedInUsers() ||
  36       shell->session_state_delegate()->IsScreenLocked()) {
  37     // The gestures are disabled in the lock/login screen.
  38     return false;
  39   }
  40
  41   // TODO(oshima): Find the root window controller from event's location.
  42   RootWindowController* controller = Shell::GetPrimaryRootWindowController();
  43
  44   ShelfLayoutManager* shelf = controller->GetShelfLayoutManager();
  45
  46   const aura::Window* fullscreen = controller->GetTopmostFullscreenWindow();
  47   if (fullscreen &&
  48       ash::wm::GetWindowState(fullscreen)->hide_shelf_when_fullscreen()) {
  49     return false;
  50   }
  51
  52   if (event.type() == ui::ET_GESTURE_SCROLL_BEGIN) {
  53     drag_in_progress_ = true;
  54     shelf->StartGestureDrag(event);
  55     return true;
  56   }
  57
  58   if (!drag_in_progress_)
  59     return false;
  60
  61   if (event.type() == ui::ET_GESTURE_SCROLL_UPDATE) {
  62     if (tray_handler_) {
  63       if (!tray_handler_->UpdateGestureDrag(event))
  64         tray_handler_.reset();
  65     } else if (shelf->UpdateGestureDrag(event) ==
  66         ShelfLayoutManager::DRAG_TRAY) {
  67       tray_handler_.reset(new TrayGestureHandler());
  68     }
  69
  70     return true;
  71   }
  72
  73   drag_in_progress_ = false;
  74
  75   if (event.type() == ui::ET_GESTURE_SCROLL_END ||
  76       event.type() == ui::ET_SCROLL_FLING_START) {
  77     if (tray_handler_) {
  78       tray_handler_->CompleteGestureDrag(event);
  79       tray_handler_.reset();
  80     }
  81
  82     shelf->CompleteGestureDrag(event);
  83     return true;
  84   }
  85
  86   // Unexpected event. Reset the state and let the event fall through.
  87   shelf->CancelGestureDrag();
  88   return false;
  89 }
  90
  91 }  // namespace internal
  92 }  // namespace ash