Handle resize corner layout entirely in the platform BrowserWindow*/BrowserView* code...

chrome/browser/ui/views/tab_contents/tab_contents_container.h

 // Copyright (c) 2010 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_TAB_CONTENTS_TAB_CONTENTS_CONTAINER_H_
 #define CHROME_BROWSER_UI_VIEWS_TAB_CONTENTS_TAB_CONTENTS_CONTAINER_H_
 #pragma once
 
 #include "chrome/browser/views/tab_contents/native_tab_contents_container.h"
 #include "chrome/common/notification_observer.h"
 #include "chrome/common/notification_registrar.h"
 #include "views/view.h"
 
 class NativeTabContentsContainer;
 class RenderViewHost;
+class RenderWidgetHostView;
 class TabContents;
 
 class TabContentsContainer : public views::View,
                              public NotificationObserver {
  public:
+  // Interface to request the reserved contents area updates.
+  class ReservedAreaDelegate {
+   public:
+    // Notifies that |source|'s reserved contents area should be updated.
+    // Reserved contents area is a rect in tab contents view coordinates where
+    // contents should not be rendered (to display the resize corner, sidebar
+    // mini tabs or any other UI elements overlaying this container).
+    virtual void UpdateReservedContentsRect(
+        const TabContentsContainer* source) = 0;
+   protected:
+    virtual ~ReservedAreaDelegate() {}
+  };
+
   TabContentsContainer();
   virtual ~TabContentsContainer();
 
   // Changes the TabContents associated with this view.
   void ChangeTabContents(TabContents* contents);
 
   View* GetFocusView() { return native_container_->GetView(); }
 
   // Accessor for |tab_contents_|.
   TabContents* tab_contents() const { return tab_contents_; }
 
   // Called by the BrowserView to notify that |tab_contents| got the focus.
   void TabContentsFocused(TabContents* tab_contents);
 
   // Tells the container to update less frequently during resizing operations
   // so performance is better.
   void SetFastResize(bool fast_resize);
 
+  void set_reserved_area_delegate(ReservedAreaDelegate* delegate) {
+    reserved_area_delegate_ = delegate;
+  }
+
   // Overridden from NotificationObserver:
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
 
   // Overridden from views::View:
   virtual void Layout();
   virtual AccessibilityTypes::Role GetAccessibleRole();
 
  protected:
   // Overridden from views::View:
   virtual void ViewHierarchyChanged(bool is_add, views::View* parent,
                                     views::View* child);
 
  private:
   // Add or remove observers for events that we care about.
   void AddObservers();
   void RemoveObservers();
 
   // Called when the RenderViewHost of the hosted TabContents has changed, e.g.
   // to show an interstitial page.
   void RenderViewHostChanged(RenderViewHost* old_host,
                              RenderViewHost* new_host);
 
   // Called when a TabContents is destroyed. This gives us a chance to clean
   // up our internal state if the TabContents is somehow destroyed before we
   // get notified.
   void TabContentsDestroyed(TabContents* contents);
 
+  // Called when the RenderWidgetHostView of the hosted TabContents has changed.
+  void RenderWidgetHostViewChanged(RenderWidgetHostView* old_view,
+                                   RenderWidgetHostView* new_view);
+
   // An instance of a NativeTabContentsContainer object that holds the native
   // view handle associated with the attached TabContents.
   NativeTabContentsContainer* native_container_;
 
   // The attached TabContents.
   TabContents* tab_contents_;
 
   // Handles registering for our notifications.
   NotificationRegistrar registrar_;
 
+  // Delegate for enquiring reserved contents area. Not owned by us.
+  ReservedAreaDelegate* reserved_area_delegate_;
+
   DISALLOW_COPY_AND_ASSIGN(TabContentsContainer);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TAB_CONTENTS_TAB_CONTENTS_CONTAINER_H_