/// <summary>
/// Set the window as foreground window
/// </summary>
/// <param name="interopWindow">The window to bring to the foreground</param>
public static async ValueTask ToForegroundAsync(this IInteropWindow interopWindow)
{
// Nothing we can do if it's not visible!
if (!interopWindow.IsVisible())
{
return;
}
var foregroundWindow = User32Api.GetForegroundWindow();
// Window is already the foreground window
if (foregroundWindow == interopWindow.Handle)
{
return;
}
if (interopWindow.IsMinimized())
{
interopWindow.Restore();
while (interopWindow.IsMinimized())
{
await Task.Delay(50).ConfigureAwait(false);
}
}
// See https://msdn.microsoft.com/en-us/library/windows/desktop/ms633539(v=vs.85).aspx
// It was advised to use the menu (ALT) key, but this was a solution which Jan Karger showed me
var threadId1 = User32Api.GetWindowThreadProcessId(foregroundWindow, IntPtr.Zero);
var threadId2 = User32Api.GetWindowThreadProcessId(interopWindow.Handle, IntPtr.Zero);
// Show window in foreground.
if (threadId1 != threadId2)
{
User32Api.AttachThreadInput(threadId1, threadId2, 1);
User32Api.SetForegroundWindow(interopWindow.Handle);
User32Api.AttachThreadInput(threadId1, threadId2, 0);
}
else
{
User32Api.SetForegroundWindow(interopWindow.Handle);
}
// Show window in foreground.
User32Api.BringWindowToTop(interopWindow.Handle);
User32Api.SetForegroundWindow(interopWindow.Handle);
}