ash/wm/toplevel_window_event_handler.h

   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 #ifndef ASH_WM_TOPLEVEL_WINDOW_EVENT_HANDLER_H_
   6 #define ASH_WM_TOPLEVEL_WINDOW_EVENT_HANDLER_H_
   7
   8 #include <set>
   9
  10 #include "ash/ash_export.h"
  11 #include "ash/display/display_controller.h"
  12 #include "ash/wm/wm_types.h"
  13 #include "base/callback.h"
  14 #include "base/compiler_specific.h"
  15 #include "base/memory/scoped_ptr.h"
  16 #include "ui/events/event_handler.h"
  17 #include "ui/gfx/geometry/point.h"
  18 #include "ui/gfx/geometry/rect.h"
  19 #include "ui/wm/public/window_move_client.h"
  20
  21 namespace aura {
  22 class Window;
  23 }
  24
  25 namespace ui {
  26 class LocatedEvent;
  27 }
  28
  29 namespace ash {
  30
  31 class WindowResizer;
  32
  33 class ASH_EXPORT ToplevelWindowEventHandler
  34     : public ui::EventHandler,
  35       public aura::client::WindowMoveClient,
  36       public DisplayController::Observer {
  37  public:
  38   ToplevelWindowEventHandler();
  39   ~ToplevelWindowEventHandler() override;
  40
  41   // Overridden from ui::EventHandler:
  42   void OnKeyEvent(ui::KeyEvent* event) override;
  43   void OnMouseEvent(ui::MouseEvent* event) override;
  44   void OnGestureEvent(ui::GestureEvent* event) override;
  45
  46   // Overridden form aura::client::WindowMoveClient:
  47   aura::client::WindowMoveResult RunMoveLoop(
  48       aura::Window* source,
  49       const gfx::Vector2d& drag_offset,
  50       aura::client::WindowMoveSource move_source) override;
  51   void EndMoveLoop() override;
  52
  53   // Overridden form ash::DisplayController::Observer:
  54   void OnDisplayConfigurationChanging() override;
  55
  56  private:
  57   class ScopedWindowResizer;
  58
  59   enum DragCompletionStatus {
  60     DRAG_COMPLETE,
  61     DRAG_REVERT,
  62
  63     // To be used when WindowResizer::GetTarget() is destroyed. Neither
  64     // completes nor reverts the drag because both access the WindowResizer's
  65     // window.
  66     DRAG_RESIZER_WINDOW_DESTROYED
  67   };
  68
  69   // Attempts to start a drag if one is not already in progress. Returns true if
  70   // successful.
  71   bool AttemptToStartDrag(aura::Window* window,
  72                           const gfx::Point& point_in_parent,
  73                           int window_component,
  74                           aura::client::WindowMoveSource source);
  75
  76   // Completes or reverts the drag if one is in progress. Returns true if a
  77   // drag was completed or reverted.
  78   bool CompleteDrag(DragCompletionStatus status);
  79
  80   void HandleMousePressed(aura::Window* target, ui::MouseEvent* event);
  81   void HandleMouseReleased(aura::Window* target, ui::MouseEvent* event);
  82
  83   // Called during a drag to resize/position the window.
  84   void HandleDrag(aura::Window* target, ui::LocatedEvent* event);
  85
  86   // Called during mouse moves to update window resize shadows.
  87   void HandleMouseMoved(aura::Window* target, ui::LocatedEvent* event);
  88
  89   // Called for mouse exits to hide window resize shadows.
  90   void HandleMouseExited(aura::Window* target, ui::LocatedEvent* event);
  91
  92   // Sets |window|'s state type to |new_state_type|. Called after the drag has
  93   // been completed for fling gestures.
  94   void SetWindowStateTypeFromGesture(aura::Window* window,
  95                                     wm::WindowStateType new_state_type);
  96
  97   // Invoked from ScopedWindowResizer if the window is destroyed.
  98   void ResizerWindowDestroyed();
  99
 100   // The hittest result for the first finger at the time that it initially
 101   // touched the screen. |first_finger_hittest_| is one of ui/base/hit_test.h
 102   int first_finger_hittest_;
 103
 104   // The window bounds when the drag was started. When a window is minimized,
 105   // maximized or snapped via a swipe/fling gesture, the restore bounds should
 106   // be set to the bounds of the window when the drag was started.
 107   gfx::Rect pre_drag_window_bounds_;
 108
 109   // Are we running a nested message loop from RunMoveLoop().
 110   bool in_move_loop_;
 111
 112   // Is a window move/resize in progress because of gesture events?
 113   bool in_gesture_drag_;
 114
 115   // Whether the drag was reverted. Set by CompleteDrag().
 116   bool drag_reverted_;
 117
 118   scoped_ptr<ScopedWindowResizer> window_resizer_;
 119
 120   base::Closure quit_closure_;
 121
 122   // Used to track if this object is deleted while running a nested message
 123   // loop. If non-null the destructor sets this to true.
 124   bool* destroyed_;
 125
 126   DISALLOW_COPY_AND_ASSIGN(ToplevelWindowEventHandler);
 127 };
 128
 129 }  // namespace aura
 130
 131 #endif  // ASH_WM_TOPLEVEL_WINDOW_EVENT_HANDLER_H_