chrome_frame/infobars/internal/displaced_window_manager.cc

   1 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome_frame/infobars/internal/displaced_window_manager.h"
   6
   7 DisplacedWindowManager::DisplacedWindowManager() {
   8 }
   9
  10 void DisplacedWindowManager::UpdateLayout() {
  11   // Call SetWindowPos with SWP_FRAMECHANGED for displaced window.
  12   // Displaced window will receive WM_NCCALCSIZE to recalculate its client size.
  13   ::SetWindowPos(m_hWnd,
  14                  NULL, 0, 0, 0, 0,
  15                  SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER |
  16                  SWP_FRAMECHANGED);
  17 }
  18
  19 LRESULT DisplacedWindowManager::OnNcCalcSize(BOOL calc_valid_rects,
  20                                              LPARAM lparam) {
  21   // Ask the original window proc to calculate the 'natural' size of the window.
  22   LRESULT ret = DefWindowProc(WM_NCCALCSIZE,
  23                               static_cast<WPARAM>(calc_valid_rects), lparam);
  24   if (lparam == NULL)
  25     return ret;
  26
  27   // Whether calc_valid_rects is true or false, we could treat beginning of
  28   // lparam as a RECT object.
  29   RECT* rect = reinterpret_cast<RECT*>(lparam);
  30   RECT natural_rect = *rect;
  31   if (delegate() != NULL)
  32     delegate()->AdjustDisplacedWindowDimensions(rect);
  33
  34   // If we modified the window's dimensions, there is no way to respect a custom
  35   // "client-area preservation strategy", so we must force a redraw to be safe.
  36   if (calc_valid_rects && ret == WVR_VALIDRECTS &&
  37       !EqualRect(&natural_rect, rect)) {
  38     ret = WVR_REDRAW;
  39   }
  40
  41   return ret;
  42 }