ash/system/overview/overview_button_tray.h

   1 // Copyright 2014 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_SYSTEM_OVERVIEW_OVERVIEW_BUTTON_TRAY_H_
   6 #define ASH_SYSTEM_OVERVIEW_OVERVIEW_BUTTON_TRAY_H_
   7
   8 #include "ash/ash_export.h"
   9 #include "ash/session/session_state_observer.h"
  10 #include "ash/shell_observer.h"
  11 #include "ash/system/tray/tray_background_view.h"
  12
  13 namespace views {
  14 class ImageView;
  15 }
  16
  17 namespace ash {
  18
  19 // Status area tray for showing a toggle for Overview Mode. Overview Mode
  20 // is equivalent to WindowSelectorController being in selection mode.
  21 // This hosts a ShellObserver that listens for the activation of Maximize Mode
  22 // This tray will only be visible while in this state. This tray does not
  23 // provide any bubble view windows.
  24 class ASH_EXPORT OverviewButtonTray : public TrayBackgroundView,
  25                                       public SessionStateObserver,
  26                                       public ShellObserver {
  27  public:
  28   explicit OverviewButtonTray(StatusAreaWidget* status_area_widget);
  29   ~OverviewButtonTray() override;
  30
  31   // Updates the tray's visibility based on the LoginStatus and the current
  32   // state of MaximizeMode
  33   virtual void UpdateAfterLoginStatusChange(user::LoginStatus status);
  34
  35   // ActionableView:
  36   bool PerformAction(const ui::Event& event) override;
  37
  38   // SessionStateObserver:
  39   void SessionStateChanged(SessionStateDelegate::SessionState state) override;
  40
  41   // ShellObserver:
  42   void OnMaximizeModeStarted() override;
  43   void OnMaximizeModeEnded() override;
  44   void OnOverviewModeEnded() override;
  45
  46   // TrayBackgroundView:
  47   bool ClickedOutsideBubble() override;
  48   base::string16 GetAccessibleNameForTray() override;
  49   void HideBubbleWithView(const views::TrayBubbleView* bubble_view) override;
  50   void SetShelfAlignment(ShelfAlignment alignment) override;
  51
  52  private:
  53   friend class OverviewButtonTrayTest;
  54
  55   // Creates a new border for the icon. The padding is determined based on the
  56   // alignment of the shelf.
  57   void SetIconBorderForShelfAlignment();
  58
  59   // Sets the icon to visible if maximize mode is enabled and
  60   // WindowSelectorController::CanSelect.
  61   void UpdateIconVisibility();
  62
  63   // Weak pointer, will be parented by TrayContainer for its lifetime.
  64   views::ImageView* icon_;
  65
  66   DISALLOW_COPY_AND_ASSIGN(OverviewButtonTray);
  67 };
  68
  69 }  // namespace ash
  70
  71 #endif  // ASH_SYSTEM_OVERVIEW_OVERVIEW_BUTTON_TRAY_H_