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

chrome_frame/infobar_window.h

Index: chrome_frame/infobar_window.h
===================================================================
--- chrome_frame/infobar_window.h	(revision 0)
+++ chrome_frame/infobar_window.h	(revision 0)
@@ -0,0 +1,125 @@
+// 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_INFOBAR_WINDOW_H_
+#define CHROME_FRAME_INFOBAR_WINDOW_H_
+
+#include "base/singleton.h"
+#include "base/scoped_ptr.h"
+#include "base/time.h"
+
+#include <atlbase.h>
+#include <atlapp.h>  // Must be included AFTER base.
+#include <atlcrack.h>
+#include <atlframe.h>
+#include <atlmisc.h>
+#include <atlgdi.h>
+#include <atlwin.h>
+
+#include "chrome_frame/resource1.h"
+#include "chrome_frame/infobar_content.h"
+
+enum InfobarType {
+  FIRST_INFOBAR_TYPE = 0,
+  TOP_INFOBAR = 0,          // Infobar at the top.
+  BOTTOM_INFOBAR = 1,       // Infobar at the bottom.
+  END_OF_INFOBAR_TYPE = 2

[grt (UTC plus 2), 2010/11/10 17:59:29]

The way this value is used, I would find it more natural for it to be called a
COUNT.

[erikwright (departed), 2010/11/24 06:24:56]

Hope to get rid of it altogether.

+};
+
+// InfobarWindow is the window created on the top or bottom of the browser tab
+// window that contains the web browser window.
+class InfobarWindow
+    : public CWindowImpl<InfobarWindow, CWindow> {
+ public:
+  BEGIN_MSG_MAP(InfobarWindow)
+    MSG_WM_TIMER(OnTimer)
+    MSG_WM_DESTROY(OnDestroy)
+  END_MSG_MAP()
+
+  // 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 update the layout of all infobars. Returns true
+    // if the request is successful.
+    virtual bool UpdateLayout() = 0;
+  };
+
+  InfobarWindow(InfobarType type, InfobarHost* host);
+  ~InfobarWindow();
+
+  // Shows the infobar.
+  // The height of the infobar is calculated to fit the content (limited to
+  // max_height if the content is too high; no limit if max_height is set to 0).
+  // slide indicates whether to show sliding effect.
+  // Normally, content->InstallInFrame will be called before Show returns.
+  // IFF successful, content->Reset is guaranteed to be called when the content
+  // is no longer visible. The InfobarContent implementation is responsible for
+  // freeing itself and its resources during or after the call to Reset.
+  HRESULT Show(InfobarContent *content, int max_height);
+  // Hides the infobar.
+  HRESULT 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:
+    FrameImpl(InfobarWindow* infobar_window)

[grt (UTC plus 2), 2010/11/10 17:59:29]

explicit

[erikwright (departed), 2010/11/24 06:24:56]

Thanks.

+      : infobar_window_(infobar_window) { }
+
+    // ContentFrame implementation
+    virtual HWND GetFrameWindow() { return *infobar_window_; }
+    virtual void CloseInfobar() { infobar_window_->Hide(); }
+
+   private:
+    InfobarWindow* infobar_window_;

[grt (UTC plus 2), 2010/11/10 17:59:29]

DISALLOW_COPY_AND_ASSIGN?

[erikwright (departed), 2010/11/24 06:24:56]

Thanks.

+  };
+
+  // Sets up our state to show or hide and calls InfobarHost::UpdateLayout to
+  // cause an eventual call to ReserveSpace. If sliding, also sets up a timer to
+  // periodically call UpdateLayout.
+  void StartUpdatingLayout(bool show, int max_height, bool slide);
+
+  // 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);
+
+  // Calls content_->Reset() when the InfobarWindow is destroyed (most likely
+  // because the browser/tab is going away).
+  void OnDestroy();
+
+  // 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_;
+  // Whether the infobar is shown or not.
+  bool show_;
+  // 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_;
+
+  DISALLOW_COPY_AND_ASSIGN(InfobarWindow);
+};
+
+#endif  // CHROME_FRAME_INFOBAR_WINDOW_H_