Preview CL for adding an Infobar facility to Google Chrome Frame....

chrome_frame/infobars/content.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_FRAME_INFOBARS_CONTENT_H_
+#define CHROME_FRAME_INFOBARS_CONTENT_H_
+
+#include <windows.h>
+
+// Provides an interface between content to be displayed in an infobar and the
+// infobar facility. Pass an instance of your implementation to
+// InfobarManager::Show, which will result in a call to InstallInFrame to
+// initialize the InfobarContent.
+//
+// The instance will be deleted by the infobar facility when it is no longer
+// being displayed (or immediately, in the case of a failure to display).
+class InfobarContent {
+ public:
+  // Provides access to the content's parent window and allows the
+  // InfobarContent to close itself, such as in response to user interaction.
+  class Frame {
+   public:
+    virtual ~Frame() {}
+
+    // Returns the window in which the content should display itself.
+    virtual HWND GetFrameWindow() = 0;
+
+    // Initiates closing of the infobar.
+    virtual void CloseInfobar() = 0;
+  };  // class Frame
+
+  virtual ~InfobarContent() {}
+
+  // Prepares the content to display in the provided frame.
+  //
+  // The frame pointer remains valid until the InfobarContent instance is
+  // deleted.
+  virtual bool InstallInFrame(Frame* frame) = 0;
+
+  // Provides the content with the dimensions available to it for display.
+  // Dimensions are relative to the origin of the frame window.
+  virtual void SetDimensions(const RECT& dimensions) = 0;
+
+  // Finds the desired value for one dimension given a fixed value for the other
+  // dimension. The fixed dimension parameter is non-zero whereas the requested
+  // dimension parameter will be zero.
+  virtual size_t GetDesiredSize(size_t width, size_t height) = 0;
+};  // class InfobarContent
+
+#endif  // CHROME_FRAME_INFOBARS_CONTENT_H_