Provide the custom thumbnail for live preview of stacked panels

chrome/browser/ui/views/panels/panel_stack_view.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_PANELS_PANEL_STACK_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_PANELS_PANEL_STACK_VIEW_H_
 
 #include <list>
 #include <map>
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/ui/panels/native_panel_stack_window.h"
 #include "ui/base/animation/animation_delegate.h"
 #include "ui/views/focus/widget_focus_manager.h"
 #include "ui/views/widget/widget_delegate.h"
 #include "ui/views/widget/widget_observer.h"
 
-class TaskbarWindowThumbnailerWin;
+#if defined(OS_WIN)
+#include "chrome/browser/ui/views/panels/taskbar_window_thumbnailer_win.h"
+#endif
+
 namespace ui {
 class LinearAnimation;
 }
 namespace views {
 class Widget;
 }
 
 // A native window that acts as the owner of all panels in the stack, in order
 // to make all panels appear as a single window on the taskbar or launcher.
 class PanelStackView : public NativePanelStackWindow,
                        public views::WidgetObserver,
                        public views::WidgetDelegateView,
                        public views::WidgetFocusChangeListener,
+#if defined(OS_WIN)
+                       public TaskbarWindowThumbnailerDelegateWin,
+#endif
                        public ui::AnimationDelegate {
  public:
   explicit PanelStackView(NativePanelStackWindowDelegate* delegate);
   virtual ~PanelStackView();
 
  protected:
   // Overridden from NativePanelStackWindow:
   virtual void Close() OVERRIDE;
   virtual void AddPanel(Panel* panel) OVERRIDE;
   virtual void RemovePanel(Panel* panel) OVERRIDE;
@@ skipping 20 matching lines @@
   // Overridden from views::WidgetDelegate:
   virtual string16 GetWindowTitle() const OVERRIDE;
   virtual gfx::ImageSkia GetWindowAppIcon() OVERRIDE;
   virtual gfx::ImageSkia GetWindowIcon() OVERRIDE;
   virtual views::Widget* GetWidget() OVERRIDE;
   virtual const views::Widget* GetWidget() const OVERRIDE;
   virtual void DeleteDelegate() OVERRIDE;
 
   // Overridden from views::WidgetObserver:
   virtual void OnWidgetDestroying(views::Widget* widget) OVERRIDE;
-  virtual void OnWidgetActivationChanged(views::Widget* widget,
-                                         bool active) OVERRIDE;
 
   // Overridden from views::WidgetFocusChangeListener:
   virtual void OnNativeFocusChange(gfx::NativeView focused_before,
                                    gfx::NativeView focused_now) OVERRIDE;
 
   // Overridden from AnimationDelegate:
   virtual void AnimationEnded(const ui::Animation* animation) OVERRIDE;
   virtual void AnimationProgressed(const ui::Animation* animation) OVERRIDE;
 
   // Updates the bounds of panels as specified in batch update data.
   void UpdatePanelsBounds();
 
+  // Notifies the delegate that the updates of the panel bounds are completed.
+  void NotifyBoundsUpdateCompleted();
+
   // Computes/updates the minimum bounds that could fit all panels.
   gfx::Rect GetStackWindowBounds() const;
   void UpdateStackWindowBounds();
 
   views::Widget* CreateWindowWithBounds(const gfx::Rect& bounds);
   void EnsureWindowCreated();
 
   // Makes the stack window own the panel window such that multiple panels
   // stacked together could appear as a single window on the taskbar or
   // launcher.
   static void MakeStackWindowOwnPanelWindow(Panel* panel,
                                             PanelStackView* stack_window);
 
 #if defined(OS_WIN)
-  // Capture the thumbnail of the whole stack and provide it to live preview
-  // (available since Windows 7).
-  void CaptureThumbnailForLivePreview();
+  // Overridden from TaskbarWindowThumbnailerDelegateWin:
+  virtual std::vector<HWND> GetSnapshotWindowHandles() const OVERRIDE;
+
+  // Updates the live preview snapshot when something changes, like
+  // adding/removing/moving/resizing a stacked panel.
+  void RefreshLivePreviewThumbnail();
 
   // Updates the bounds of the widget window in a deferred way.
   void DeferUpdateNativeWindowBounds(HDWP defer_window_pos_info,
                                      views::Widget* window,
                                      const gfx::Rect& bounds);
 #endif
 
   NativePanelStackWindowDelegate* delegate_;
 
   views::Widget* window_;  // Weak pointer, own us.
 
   bool is_closing_;
 
   // Tracks all panels that are enclosed by this window.
   Panels panels_;
 
   // Is the taskbar icon of the underlying window being flashed in order to
   // draw the user's attention?
   bool is_drawing_attention_;
 
 #if defined(OS_WIN)
-  // Used to provide custom taskbar thumbnail for Windows 7 and later.
+  // The custom live preview snapshot is always provided for the stack window.
+  // This is because the system might not show the snapshot correctly for
+  // a small window, like collapsed panel.
   scoped_ptr<TaskbarWindowThumbnailerWin> thumbnailer_;
 #endif
 
   // For batch bounds update.
   bool animate_bounds_updates_;
   bool bounds_updates_started_;
   BoundsUpdates bounds_updates_;
 
   // Used to animate the bounds changes at a synchronized pace.
   scoped_ptr<ui::LinearAnimation> bounds_animator_;
 
   DISALLOW_COPY_AND_ASSIGN(PanelStackView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_PANELS_PANEL_STACK_VIEW_H_