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(
  32     const ui::GestureEvent& event,
  33     const aura::Window* event_target_window) {
  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   RootWindowController* controller =
  42       RootWindowController::ForWindow(event_target_window);
  43   ShelfLayoutManager* shelf = controller->GetShelfLayoutManager();
  44
  45   if (event.type() == ui::ET_GESTURE_WIN8_EDGE_SWIPE) {
  46     shelf->OnGestureEdgeSwipe(event);
  47     return true;
  48   }
  49
  50   const aura::Window* fullscreen = controller->GetWindowForFullscreenMode();
  51   if (fullscreen &&
  52       ash::wm::GetWindowState(fullscreen)->hide_shelf_when_fullscreen()) {
  53     return false;
  54   }
  55
  56   if (event.type() == ui::ET_GESTURE_SCROLL_BEGIN) {
  57     drag_in_progress_ = true;
  58     shelf->StartGestureDrag(event);
  59     return true;
  60   }
  61
  62   if (!drag_in_progress_)
  63     return false;
  64
  65   if (event.type() == ui::ET_GESTURE_SCROLL_UPDATE) {
  66     shelf->UpdateGestureDrag(event);
  67     return true;
  68   }
  69
  70   drag_in_progress_ = false;
  71
  72   if (event.type() == ui::ET_GESTURE_SCROLL_END ||
  73       event.type() == ui::ET_SCROLL_FLING_START) {
  74     shelf->CompleteGestureDrag(event);
  75     return true;
  76   }
  77
  78   // Unexpected event. Reset the state and let the event fall through.
  79   shelf->CancelGestureDrag();
  80   return false;
  81 }
  82
  83 }  // namespace ash