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      1 // Copyright (c) 2013 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 CHROME_BROWSER_UI_VIEWS_PANELS_PANEL_STACK_VIEW_H_
      6 #define CHROME_BROWSER_UI_VIEWS_PANELS_PANEL_STACK_VIEW_H_
      7 
      8 #include <list>
      9 #include <map>
     10 #include "base/basictypes.h"
     11 #include "base/memory/scoped_ptr.h"
     12 #include "chrome/browser/ui/panels/native_panel_stack_window.h"
     13 #include "ui/gfx/animation/animation_delegate.h"
     14 #include "ui/views/focus/widget_focus_manager.h"
     15 #include "ui/views/widget/widget_delegate.h"
     16 #include "ui/views/widget/widget_observer.h"
     17 
     18 #if defined(OS_WIN)
     19 #include "chrome/browser/ui/views/panels/taskbar_window_thumbnailer_win.h"
     20 #include "ui/base/win/hwnd_subclass.h"
     21 #endif
     22 
     23 namespace gfx {
     24 class LinearAnimation;
     25 }
     26 namespace views {
     27 class Widget;
     28 }
     29 
     30 // A native window that acts as the owner of all panels in the stack, in order
     31 // to make all panels appear as a single window on the taskbar or launcher.
     32 class PanelStackView : public NativePanelStackWindow,
     33                        public views::WidgetFocusChangeListener,
     34 #if defined(OS_WIN)
     35                        public ui::HWNDMessageFilter,
     36                        public TaskbarWindowThumbnailerDelegateWin,
     37 #endif
     38                        public gfx::AnimationDelegate {
     39  public:
     40   explicit PanelStackView(NativePanelStackWindowDelegate* delegate);
     41   virtual ~PanelStackView();
     42 
     43  protected:
     44   // Overridden from NativePanelStackWindow:
     45   virtual void Close() OVERRIDE;
     46   virtual void AddPanel(Panel* panel) OVERRIDE;
     47   virtual void RemovePanel(Panel* panel) OVERRIDE;
     48   virtual void MergeWith(NativePanelStackWindow* another) OVERRIDE;
     49   virtual bool IsEmpty() const OVERRIDE;
     50   virtual bool HasPanel(Panel* panel) const OVERRIDE;
     51   virtual void MovePanelsBy(const gfx::Vector2d& delta) OVERRIDE;
     52   virtual void BeginBatchUpdatePanelBounds(bool animate) OVERRIDE;
     53   virtual void AddPanelBoundsForBatchUpdate(
     54       Panel* panel, const gfx::Rect& new_bounds) OVERRIDE;
     55   virtual void EndBatchUpdatePanelBounds() OVERRIDE;
     56   virtual bool IsAnimatingPanelBounds() const OVERRIDE;
     57   virtual void Minimize() OVERRIDE;
     58   virtual bool IsMinimized() const OVERRIDE;
     59   virtual void DrawSystemAttention(bool draw_attention) OVERRIDE;
     60   virtual void OnPanelActivated(Panel* panel) OVERRIDE;
     61 
     62  private:
     63   typedef std::list<Panel*> Panels;
     64 
     65   // The map value is old bounds of the panel.
     66   typedef std::map<Panel*, gfx::Rect> BoundsUpdates;
     67 
     68   // Overridden from views::WidgetFocusChangeListener:
     69   virtual void OnNativeFocusChange(gfx::NativeView focused_before,
     70                                    gfx::NativeView focused_now) OVERRIDE;
     71 
     72   // Overridden from AnimationDelegate:
     73   virtual void AnimationEnded(const gfx::Animation* animation) OVERRIDE;
     74   virtual void AnimationProgressed(const gfx::Animation* animation) OVERRIDE;
     75   virtual void AnimationCanceled(const gfx::Animation* animation) OVERRIDE;
     76 
     77   // Updates the bounds of panels as specified in batch update data.
     78   void UpdatePanelsBounds();
     79 
     80   // Notifies the delegate that the updates of the panel bounds are completed.
     81   void NotifyBoundsUpdateCompleted();
     82 
     83   // Computes/updates the minimum bounds that could fit all panels.
     84   gfx::Rect GetStackWindowBounds() const;
     85   void UpdateStackWindowBounds();
     86 
     87   views::Widget* CreateWindowWithBounds(const gfx::Rect& bounds);
     88   void EnsureWindowCreated();
     89 
     90   // Makes the stack window own the panel window such that multiple panels
     91   // stacked together could appear as a single window on the taskbar or
     92   // launcher.
     93   static void MakeStackWindowOwnPanelWindow(Panel* panel,
     94                                             PanelStackView* stack_window);
     95 
     96 #if defined(OS_WIN)
     97   // Overridden from ui::HWNDMessageFilter:
     98   virtual bool FilterMessage(HWND hwnd,
     99                              UINT message,
    100                              WPARAM w_param,
    101                              LPARAM l_param,
    102                              LRESULT* l_result) OVERRIDE;
    103 
    104   // Overridden from TaskbarWindowThumbnailerDelegateWin:
    105   virtual std::vector<HWND> GetSnapshotWindowHandles() const OVERRIDE;
    106 
    107   // Updates the live preview snapshot when something changes, like
    108   // adding/removing/moving/resizing a stacked panel.
    109   void RefreshLivePreviewThumbnail();
    110 
    111   // Updates the bounds of the widget window in a deferred way.
    112   void DeferUpdateNativeWindowBounds(HDWP defer_window_pos_info,
    113                                      views::Widget* window,
    114                                      const gfx::Rect& bounds);
    115 #endif
    116 
    117   NativePanelStackWindowDelegate* delegate_;
    118 
    119   views::Widget* window_;  // Weak pointer, own us.
    120 
    121   // Tracks all panels that are enclosed by this window.
    122   Panels panels_;
    123 
    124   // Is the taskbar icon of the underlying window being flashed in order to
    125   // draw the user's attention?
    126   bool is_drawing_attention_;
    127 
    128 #if defined(OS_WIN)
    129   // The custom live preview snapshot is always provided for the stack window.
    130   // This is because the system might not show the snapshot correctly for
    131   // a small window, like collapsed panel.
    132   scoped_ptr<TaskbarWindowThumbnailerWin> thumbnailer_;
    133 #endif
    134 
    135   // For batch bounds update.
    136   bool animate_bounds_updates_;
    137   bool bounds_updates_started_;
    138   BoundsUpdates bounds_updates_;
    139 
    140   // Used to animate the bounds changes at a synchronized pace.
    141   scoped_ptr<gfx::LinearAnimation> bounds_animator_;
    142 
    143   DISALLOW_COPY_AND_ASSIGN(PanelStackView);
    144 };
    145 
    146 #endif  // CHROME_BROWSER_UI_VIEWS_PANELS_PANEL_STACK_VIEW_H_
    147