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/shelf/shelf_layout_manager.h"
   9 #include "ash/shelf/shelf_types.h"
  10 #include "ash/shelf/shelf_widget.h"
  11 #include "ash/shell.h"
  12 #include "ash/shell_delegate.h"
  13 #include "ash/system/status_area_widget.h"
  14 #include "ash/wm/gestures/tray_gesture_handler.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 namespace internal {
  24
  25 ShelfGestureHandler::ShelfGestureHandler()
  26     : drag_in_progress_(false) {
  27 }
  28
  29 ShelfGestureHandler::~ShelfGestureHandler() {
  30 }
  31
  32 bool ShelfGestureHandler::ProcessGestureEvent(const ui::GestureEvent& event) {
  33   Shell* shell = Shell::GetInstance();
  34   if (!shell->delegate()->IsUserLoggedIn() ||
  35       shell->delegate()->IsScreenLocked()) {
  36     // The gestures are disabled in the lock/login screen.
  37     return false;
  38   }
  39
  40   // The gesture are disabled for fullscreen windows.
  41   aura::Window* active = wm::GetActiveWindow();
  42   if (active && wm::IsWindowFullscreen(active))
  43     return false;
  44
  45   // TODO(oshima): Find the root window controller from event's location.
  46   ShelfLayoutManager* shelf =
  47       Shell::GetPrimaryRootWindowController()->GetShelfLayoutManager();
  48   if (event.type() == ui::ET_GESTURE_SCROLL_BEGIN) {
  49     drag_in_progress_ = true;
  50     shelf->StartGestureDrag(event);
  51     return true;
  52   }
  53
  54   if (!drag_in_progress_)
  55     return false;
  56
  57   if (event.type() == ui::ET_GESTURE_SCROLL_UPDATE) {
  58     if (tray_handler_.get()) {
  59       if (!tray_handler_->UpdateGestureDrag(event))
  60         tray_handler_.reset();
  61     } else if (shelf->UpdateGestureDrag(event) ==
  62         ShelfLayoutManager::DRAG_TRAY) {
  63       tray_handler_.reset(new TrayGestureHandler());
  64     }
  65
  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     if (tray_handler_.get()) {
  74       tray_handler_->CompleteGestureDrag(event);
  75       tray_handler_.reset();
  76     }
  77
  78     shelf->CompleteGestureDrag(event);
  79     return true;
  80   }
  81
  82   // Unexpected event. Reset the state and let the event fall through.
  83   shelf->CancelGestureDrag();
  84   return false;
  85 }
  86
  87 }  // namespace internal
  88 }  // namespace ash