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

chrome_frame/infobars/internal/infobar_window.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_INTERNAL_INFOBAR_WINDOW_H_
+#define CHROME_FRAME_INFOBARS_INTERNAL_INFOBAR_WINDOW_H_
+
+#include <atlbase.h>
+#include <atlapp.h>  // Must be included AFTER base.

[tommi (sloooow) - chröme, 2010/11/24 16:08:24]

same comment for atlapp as before (and I believe for all atlapp includes)

[erikwright (departed), 2010/12/01 20:05:52]

Done.
(Moved to subclassing_window.h)

+#include <atlcrack.h>
+
+#include "base/basictypes.h"
+#include "base/time.h"
+
+#include "chrome_frame/infobars/content.h"
+#include "chrome_frame/infobars/manager.h"
+
+// InfobarWindow is the window created on the top or bottom of the browser tab

[grt (UTC plus 2), 2010/11/25 18:00:13]

Technically speaking, is the InfobarWindow _in_ the browser tab window (i.e., a
child of it)?  From this comment, I'm not sure if the InfobarWindow obscures
part of the tab window ("on top of") or not.

[erikwright (departed), 2010/12/01 20:05:52]

Comment revised. Please let me know if it does not answer the question.

+// window that contains the web browser window.
+class InfobarWindow : public CWindowImpl<InfobarWindow, CWindow> {
+ public:
+  // Implementations of InfobarHost manage the integration of an InfobarWindow
+  // with its environment.
+  class InfobarHost {
+   public:
+    virtual ~InfobarHost() {}
+    // Returns a handle to the window in which this InfobarWindow should be
+    // created.
+    virtual HWND GetContainerWindow() = 0;
+    // Requests that the host initiate a deferred layout sequence (calling
+    // ReserveSpace on each of its infobars). Returns true if the request
+    // succeeded and will be honoured.
+    virtual bool UpdateLayout() = 0;
+  };
+
+  InfobarWindow(InfobarType type, InfobarHost* host);
+  ~InfobarWindow();
+
+  BEGIN_MSG_MAP(InfobarWindow)
+    MSG_WM_TIMER(OnTimer)
+  END_MSG_MAP()
+
+  // Shows the infobar. The height of the infobar is calculated to fit the
+  // content.
+  //
+  // Normally, InfobarContent::InstallInFrame will be called before Show
+  // returns. InfobarContent::Reset() is guaranteed to be called when the
+  // InfobarWindow is done displaying the content (either due to failure or
+  // when successfully hidden).
+  //
+  // The InfobarContent implementation is responsible for freeing itself and its
+  // resources during or after the call to Reset.
+  bool Show(InfobarContent *content);
+  // Hides the infobar.

[tommi (sloooow) - chröme, 2010/11/24 16:08:24]

I prefer spaces between functions for readability - especially those that have
comments.

[erikwright (departed), 2010/12/01 20:05:52]

Done.

+  void Hide();
+  // Receives the total space requested by the displaced window and reserves
+  // any space required by this infobar. Resizes the InfobarWindow to fill the
+  // reserved space.
+  void ReserveSpace(RECT* rect);
+
+ private:
+  // An implementation of ContentFrame that connects the Content to this
+  // InfobarWindow.
+  class FrameImpl : public InfobarContent::ContentFrame {
+   public:
+    explicit FrameImpl(InfobarWindow* infobar_window)
+      : infobar_window_(infobar_window) { }

[tommi (sloooow) - chröme, 2010/11/24 16:08:24]

indent

[erikwright (departed), 2010/12/01 20:05:52]

Done.

+
+    // ContentFrame implementation
+    virtual HWND GetFrameWindow() { return *infobar_window_; }

[grt (UTC plus 2), 2010/11/25 18:00:13]

Just a note: Chrome style guide says not to inline virtual function definitions
("virtual functions should never be declared this way"), although the Google C++
guide allows it.  Personally, I'm fine with it as-is.

[erikwright (departed), 2010/12/01 20:05:52]

Thanks! Given that they can't normally be inlined, and are definitely part of
the implementation, I decided to move them to the .cc

+    virtual void CloseInfobar() { infobar_window_->Hide(); }
+
+   private:
+    InfobarWindow* infobar_window_;
+    DISALLOW_COPY_AND_ASSIGN(FrameImpl);
+  };
+
+  // Sets up our state to show or hide and calls InfobarHost::UpdateLayout to
+  // cause an eventual call to ReserveSpace. Sets up a timer to periodically
+  // call UpdateLayout.
+  bool StartSlidingTowards(int height);
+  // Based on the initial height, how long (and if) we have been sliding, and
+  // the target height, decides what the current height should be.
+  int CalculateHeight();
+  // Implement a timer callback for sliding effect.
+  LRESULT OnTimer(UINT_PTR nIDEvent);
+
+  // Utility methods
+  bool InitializeWindow();
+  bool InstallContent(InfobarContent* content);
+  void ResetContent();
+
+  // Delegate for the InfobarContent to access us.
+  FrameImpl frame_impl_;
+  // Type of the infobar - whether it is displayed at the top or at the bottom
+  // of the IE content window.
+  InfobarType type_;
+  // Our host environment
+  InfobarHost* host_;
+  // The content we are displaying
+  InfobarContent* content_;
+  // When we started sliding, or the null time if we are not sliding.
+  base::Time slide_start_;
+  // Where we started sliding from
+  int initial_height_;
+  // Where we are sliding to
+  int target_height_;
+  int infobar_window_width_;
+
+  DISALLOW_COPY_AND_ASSIGN(InfobarWindow);
+};
+
+#endif  // CHROME_FRAME_INFOBARS_INTERNAL_INFOBAR_WINDOW_H_