Add new methods to create constrained windows for print preview and release the internal TabConte...

chrome/browser/ui/webui/constrained_html_ui.h

 // Copyright (c) 2011 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_WEBUI_CONSTRAINED_HTML_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_CONSTRAINED_HTML_UI_H_
 #pragma once
 
 #include "chrome/browser/ui/webui/chrome_web_ui.h"
 #include "content/common/property_bag.h"
 
 class ConstrainedWindow;
 class HtmlDialogUIDelegate;
 class Profile;
 class RenderViewHost;
 class TabContents;
 class TabContentsWrapper;
 
 class ConstrainedHtmlUIDelegate {
  public:
   virtual HtmlDialogUIDelegate* GetHtmlDialogUIDelegate() = 0;
 
   // Called when the dialog is being closed in response to a "DialogClose"
   // message from WebUI.
   virtual void OnDialogCloseFromWebUI() = 0;
+
+  // If called, on dialog closure, the dialog will release its TabContents
+  // instead of destroying it. After which point, the caller will own the
+  // released TabContents.
+  virtual void ReleaseTabContentsOnDialogClose() = 0;
+
+  // Returns the ConstrainedWindow.
+  virtual ConstrainedWindow* window() = 0;
+
+  // Returns the TabContentsWrapper owned by the constrained window.
+  virtual TabContentsWrapper* tab() = 0;
+
+ protected:
+  virtual ~ConstrainedHtmlUIDelegate() {}
 };
 
 // ConstrainedHtmlUI is a facility to show HTML WebUI content
 // in a tab-modal constrained dialog.  It is implemented as an adapter
 // between an HtmlDialogUI object and a ConstrainedWindow object.
 //
 // Since ConstrainedWindow requires platform-specific delegate
 // implementations, this class is just a factory stub.
 class ConstrainedHtmlUI : public ChromeWebUI {
  public:
   explicit ConstrainedHtmlUI(TabContents* contents);
   virtual ~ConstrainedHtmlUI();
 
   virtual void RenderViewCreated(RenderViewHost* render_view_host) OVERRIDE;
 
   // Create a constrained HTML dialog. The actual object that gets created
   // is a ConstrainedHtmlUIDelegate, which later triggers construction of a
   // ConstrainedHtmlUI object.
-  static ConstrainedWindow* CreateConstrainedHtmlDialog(
+  static ConstrainedHtmlUIDelegate* CreateConstrainedHtmlDialog(
       Profile* profile,
       HtmlDialogUIDelegate* delegate,
       TabContentsWrapper* overshadowed);
 
   // Returns a property accessor that can be used to set the
   // ConstrainedHtmlUIDelegate property on a TabContents.
   static PropertyAccessor<ConstrainedHtmlUIDelegate*>&
       GetPropertyAccessor();
 
  private:
   // Returns the TabContents' PropertyBag's ConstrainedHtmlUIDelegate.
   // Returns NULL if that property is not set.
   ConstrainedHtmlUIDelegate* GetConstrainedDelegate();
 
   // JS Message Handler
   void OnDialogCloseMessage(const base::ListValue* args);
 
   DISALLOW_COPY_AND_ASSIGN(ConstrainedHtmlUI);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CONSTRAINED_HTML_UI_H_