public void ParkingWindow_SystemAware()
{
// run tests only on Windows 10 versions that support thread dpi awareness.
if (!PlatformDetection.IsWindows10Version1803OrGreater)
{
return;
}
// set thread awareness context to PermonitorV2(PMv2).
// if process/thread is not in PMv2, calling 'EnterDpiAwarenessScope' is a no-op and that is by design.
// In this case, we will be setting thread to PMv2 mode and then scope to UNAWARE
IntPtr originalAwarenessContext = User32.SetThreadDpiAwarenessContext(User32.DPI_AWARENESS_CONTEXT.PER_MONITOR_AWARE_V2);
try
{
using (DpiHelper.EnterDpiAwarenessScope(User32.DPI_AWARENESS_CONTEXT.SYSTEM_AWARE))
{
using var control = new Control();
ThreadContext ctx = GetContextForHandle(new HandleRef(this, control.Handle));
Assert.NotNull(ctx);
ParkingWindow parkingWindow = ctx.GetParkingWindowForContext(User32.DPI_AWARENESS_CONTEXT.SYSTEM_AWARE);
Assert.NotNull(parkingWindow);
IntPtr dpiContext = User32.GetWindowDpiAwarenessContext(parkingWindow.Handle);
Assert.True(User32.AreDpiAwarenessContextsEqual(User32.DPI_AWARENESS_CONTEXT.SYSTEM_AWARE, dpiContext));
}
}
finally
{
// reset back to original awareness context.
User32.SetThreadDpiAwarenessContext(originalAwarenessContext);
}
}
/// <include file='doc\Application.uex' path='docs/doc[@for="Application.ThreadContext.DisposeParkingWindow"]/*' />
/// <devdoc>
/// Disposes of this thread's parking form.
/// </devdoc>
/// <internalonly/>
private void DisposeParkingWindow() {
if (parkingWindow != null && parkingWindow.IsHandleCreated) {
// We take two paths here. If we are on the same thread as
// the parking window, we can destroy its handle. If not,
// we just null it and let it GC. When it finalizes it
// will disconnect its handle and post a WM_CLOSE.
//
// It is important that we just call DestroyHandle here
// and do not call Dispose. Otherwise we would destroy
// controls that are living on the parking window.
//
int pid;
int hwndThread = SafeNativeMethods.GetWindowThreadProcessId(new HandleRef(parkingWindow, parkingWindow.Handle), out pid);
int currentThread = SafeNativeMethods.GetCurrentThreadId();
if (hwndThread == currentThread) {
parkingWindow.Destroy();
}
else {
parkingWindow = null;
}
}
}
