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

chrome_frame/infobars/internal/displaced_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_DISPLACED_WINDOW_H_
+#define CHROME_FRAME_INFOBARS_INTERNAL_DISPLACED_WINDOW_H_
+
+#include <atlbase.h>
+#include <atlcrack.h>
+#include <atlwin.h>
+
+#include "base/basictypes.h"
+#include "chrome_frame/infobars/internal/subclassing_window.h"
+
+// DisplacedWindowManager observes the HWND passed to Initialize and:
+// 1) Intercepts NCCALCSIZE events allowing the client to modify the window's
+//    requested dimensions.
+// 2) Allows the client to request a recalculation of the window's dimensions
+//    (resulting in a deferred callback as in [1]).
+// 3) Is destroyed only when the window is destroyed.
+class DisplacedWindowManager
+    : public SubclassingWindowWithDelegate<DisplacedWindowManager> {
+ public:
+  DisplacedWindowManager();
+
+  // Triggers an immediate re-evaluation of the dimensions of the displaced
+  // window. Delegate::AdjustDisplacedWindowDimensions will be called with the
+  // natural dimensions of the displaced window.
+  void UpdateLayout();
+
+  BEGIN_MSG_MAP_EX(DisplacedWindowManager)
+    MSG_WM_NCCALCSIZE(OnNcCalcSize)
+    CHAIN_MSG_MAP(SubclassingWindowWithDelegate<DisplacedWindowManager>)
+  END_MSG_MAP()
+
+ private:
+  // The size of the displaced window is being calculated. Allow
+  // InfobarWindows to reserve a part of the space for themselves, if they are
+  // visible.
+  LRESULT OnNcCalcSize(BOOL calc_valid_rects, LPARAM lparam);
+
+  DISALLOW_COPY_AND_ASSIGN(DisplacedWindowManager);
+};  // class DisplacedWindowManager
+
+#endif  // CHROME_FRAME_INFOBARS_INTERNAL_DISPLACED_WINDOW_H_