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// 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/gfx/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; GetLastError(): " << GetLastError();
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.
void ForegroundHelper::OnHotKey(int id, UINT vcode, UINT modifiers) {
SetForegroundWindow(window_);
}
} // namespace ui
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