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

chrome_frame/infobars/internal/displaced_window.cc

+// 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.
+
+#include "chrome_frame/infobars/internal/displaced_window.h"
+
+DisplacedWindowManager::DisplacedWindowManager() {
+}
+
+void DisplacedWindowManager::UpdateLayout() {
+  // Call SetWindowPos with SWP_FRAMECHANGED for displaced window.
+  // Displaced window will receive WM_NCCALCSIZE to recalculate its client size.
+  ::SetWindowPos(m_hWnd,
+                 NULL, 0, 0, 0, 0,
+                 SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER |
+                 SWP_FRAMECHANGED);
+}
+
+LRESULT DisplacedWindowManager::OnNcCalcSize(BOOL calc_valid_rects,
+                                             LPARAM lparam) {
+  // Ask the original window proc to calculate the 'natural' size of the window.
+  LRESULT ret = DefWindowProc(WM_NCCALCSIZE,
+                              static_cast<WPARAM>(calc_valid_rects), lparam);
+  if (lparam == NULL)
+    return ret;
+
+  // Whether calc_valid_rects is true or false, we could treat beginning of
+  // lparam as a RECT object.
+  RECT* rect = reinterpret_cast<RECT*>(lparam);
+  RECT natural_rect = *rect;
+  if (delegate() != NULL)
+    delegate()->AdjustDisplacedWindowDimensions(rect);
+
+  // If we modified the window's dimensions, there is no way to respect a custom
+  // "client-area preservation strategy", so we must force a redraw to be safe.
+  if (calc_valid_rects && ret == WVR_VALIDRECTS && !EqualRect(&natural_rect,

[grt (UTC plus 2), 2010/12/02 16:27:52]

nit: I find it more readable if the line wraps after && so that the EqualRect()
call isn't split.

+                                                              rect)) {
+    ret = WVR_REDRAW;
+  }
+
+  return ret;
+}