1 files changed, 84 insertions, 0 deletions
diff --git a/ui/base/win/foreground_helper.cc b/ui/base/win/foreground_helper.cc
new file mode 100644
index 0000000..0b03582
--- /dev/null
+++ b/ui/base/win/foreground_helper.cc
@@ -0,0 +1,84 @@
+// Copyright (c) 2012 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 "ui/base/win/foreground_helper.h"
+
+#include "base/logging.h"
+#include "ui/base/win/window_impl.h"
+
+namespace ui {
+
+// static
+HRESULT ForegroundHelper::SetForeground(HWND window) {
+  DCHECK(::IsWindow(window));
+  ForegroundHelper foreground_helper;
+  return foreground_helper.ForegroundHotKey(window);
+}
+
+HRESULT ForegroundHelper::ForegroundHotKey(HWND window) {
+  // This implementation registers a hot key (F22) and then
+  // triggers the hot key.  When receiving the hot key, we'll
+  // be in the foreground and allowed to move the target window
+  // into the foreground too.
+
+  set_window_style(WS_POPUP);
+  Init(NULL, gfx::Rect());
+
+  static const int kHotKeyId = 0x0000baba;
+  static const int kHotKeyWaitTimeout = 2000;
+
+  // Store the target window into our USERDATA for use in our
+  // HotKey handler.
+  window_ = window;
+  RegisterHotKey(hwnd(), kHotKeyId, 0, VK_F22);
+
+  // If the calling thread is not yet a UI thread, call PeekMessage
+  // to ensure creation of its message queue.
+  MSG msg = {0};
+  PeekMessage(&msg, NULL, 0, 0, PM_NOREMOVE);
+
+  // Send the Hotkey.
+  INPUT hotkey = {0};
+  hotkey.type = INPUT_KEYBOARD;
+  hotkey.ki.wVk =  VK_F22;
+  if (1 != SendInput(1, &hotkey, sizeof(hotkey))) {
+    LOG(WARNING) << "Failed to send input";
+    return E_FAIL;
+  }
+
+  // There are scenarios where the WM_HOTKEY is not dispatched by the
+  // the corresponding foreground thread. To prevent us from indefinitely
+  // waiting for the hotkey, we set a timer and exit the loop.
+  SetTimer(hwnd(), kHotKeyId, kHotKeyWaitTimeout, NULL);
+
+  // Loop until we get the key or the timer fires.
+  while (GetMessage(&msg, NULL, 0, 0)) {
+    TranslateMessage(&msg);
+    DispatchMessage(&msg);
+
+    if (WM_HOTKEY == msg.message)
+      break;
+    if (WM_TIMER == msg.message) {
+      SetForegroundWindow(window);
+      break;
+    }
+  }
+
+  UnregisterHotKey(hwnd(), kHotKeyId);
+  KillTimer(hwnd(), kHotKeyId);
+  DestroyWindow(hwnd());
+
+  return S_OK;
+}
+
+  // Handle the registered Hotkey being pressed.
+LRESULT ForegroundHelper::OnHotKey(UINT message,
+                                   WPARAM wparam,
+                                   LPARAM lparam,
+                                   BOOL& handled) {
+  SetForegroundWindow(window_);
+  return 1;
+}
+
+}  // namespace ui