Support dragging panels to stack and snap.

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

+// Copyright (c) 2012 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 "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "chrome/browser/ui/panels/native_panel_stack.h"
+#include "ui/views/widget/widget_delegate.h"
+#include "ui/views/widget/widget_observer.h"
+
+class StackedPanelCollection;
+
+class PanelStackView : public NativePanelStack,

[Dmitry Titov, 2013/01/09 02:29:50]

Class comment.

[jianli, 2013/01/09 21:00:59]

Done.

+                       public views::WidgetObserver,
+                       public views::WidgetDelegateView {
+ public:
+  explicit PanelStackView(StackedPanelCollection* stack);
+  ~PanelStackView();
+
+ protected:
+  // Overridden from NativePanelStack:
+  virtual void Close() OVERRIDE;
+  virtual void OnPanelAddedOrRemoved() OVERRIDE;
+  virtual gfx::NativeWindow GetNativeWindow() const OVERRIDE;
+  virtual void SetBounds(const gfx::Rect& bounds) OVERRIDE;
+
+ private:
+  // 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;
+
+  // Overridden from views::WidgetObserver:
+  virtual void OnWidgetClosing(views::Widget* widget) OVERRIDE;
+
+  scoped_ptr<StackedPanelCollection> stack_;

[Dmitry Titov, 2013/01/09 02:29:50]

naming: stack_collection_ is better, although a bit longer.

[jianli, 2013/01/09 21:00:59]

Done.

+
+  bool delay_initialized_;
+
+  views::Widget* window_;
+
+  DISALLOW_COPY_AND_ASSIGN(PanelStackView);
+};
+
+#endif  // CHROME_BROWSER_UI_VIEWS_PANELS_PANEL_STACK_VIEW_H_