/// <summary>
/// Registers the an element within a window, allowing the user to use it to drag the window.
/// Make sure that this method is called after the window has loaded; placing it in the
/// window's constructor will not work.
/// </summary>
/// <param name="window">The window.</param>
/// <param name="element">The element.</param>
public static void Register(Window window, UIElement element)
{
var windowHandle = new WindowInteropHelper(window).Handle;
if (windowHandle.ToInt64() > 0)
{
element.MouseMove += delegate(object sender, MouseEventArgs e)
{
if (e.Source == element)
{
Action moveWindow = () =>
{
if (e.LeftButton == MouseButtonState.Pressed)
{
ReleaseCapture();
SendMessage(
windowHandle,
WM_NCLBUTTONDOWN,
HT_CAPTION, 0);
}
};
// This may seem a bit odd; I was encountering an odd exception with the
// moveWindow code when I did not use the dispatcher and tried to drag off
// of a control that was not the window itself.
// More details here: http://stackoverflow.com/questions/7442943/dispatcher-throws-invalidoperationexception-on-messagebox-show-in-textchanged-ev#answer-7443519
Application.Current.Dispatcher.BeginInvoke(
DispatcherPriority.Normal,
moveWindow);
}
};
}
}
/// <summary>
/// Flashes the window in the task bar.
/// </summary>
/// <param name="window">The Window instance.</param>
/// <returns></returns>
public static bool Flash(this Window window)
{
IntPtr hWnd = new WindowInteropHelper(window).Handle;
if (hWnd.ToInt64() != 0)
{
FLASHWINFO fInfo = new FLASHWINFO();
fInfo.cbSize = Convert.ToUInt32(Marshal.SizeOf(fInfo));
fInfo.hwnd = hWnd;
fInfo.dwFlags = FLASHW_TIMER | FLASHW_TRAY;
fInfo.uCount = 3;
fInfo.dwTimeout = 0;
return FlashWindowEx(ref fInfo);
}
return false;
}
/// <summary>
/// Hides the icon in the window title bar.
/// </summary>
/// <param name="window">The Window instance.</param>
public static void HideIcon(this Window window)
{
IntPtr hwnd = new WindowInteropHelper(window).Handle;
if (hwnd.ToInt64() == 0)
{
window.SourceInitialized += (s, e) => HideIcon(window);
}
else
{
uint exStyle = GetWindowLong(hwnd, GWL_EXSTYLE);
SetWindowLong(hwnd, GWL_EXSTYLE, exStyle | WS_EX_DLGMODALFRAME);
SetWindowPos(hwnd, IntPtr.Zero, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER | SWP_FRAMECHANGED);
SendMessage(hwnd, WM_SETICON, new IntPtr(1), IntPtr.Zero); // Important if there's a native icon resource in the .exe file
SendMessage(hwnd, WM_SETICON, IntPtr.Zero, IntPtr.Zero);
}
}
/// <summary>
/// Hides the maximize button in the window title bar.
/// </summary>
/// <param name="window">The Window instance.</param>
public static void HideMaximizeBox(this Window window)
{
IntPtr hwnd = new WindowInteropHelper(window).Handle;
if (hwnd.ToInt64() == 0)
{
window.SourceInitialized += (s, e) => HideMaximizeBox(window);
}
else
{
SetWindowLong(hwnd, GWL_STYLE,
GetWindowLong(hwnd, GWL_STYLE) & ~(WS_MAXIMIZEBOX));
}
}
