public void ParkingWindow_Multiple()
{
// 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 var control = new Control();
ThreadContext ctx = GetContextForHandle(new HandleRef(this, control.Handle));
Assert.NotNull(ctx);
ParkingWindow parkingWindow = ctx.GetParkingWindowForContext(User32.DPI_AWARENESS_CONTEXT.PER_MONITOR_AWARE_V2);
Assert.NotNull(parkingWindow);
IntPtr dpiContext = User32.GetWindowDpiAwarenessContext(parkingWindow.Handle);
Assert.True(User32.AreDpiAwarenessContextsEqual(User32.DPI_AWARENESS_CONTEXT.PER_MONITOR_AWARE_V2, dpiContext));
using (DpiHelper.EnterDpiAwarenessScope(User32.DPI_AWARENESS_CONTEXT.SYSTEM_AWARE))
{
using var systemControl = new Control();
ctx = GetContextForHandle(new HandleRef(this, systemControl.Handle));
Assert.NotNull(ctx);
parkingWindow = ctx.GetParkingWindowForContext(User32.DPI_AWARENESS_CONTEXT.SYSTEM_AWARE);
Assert.NotNull(parkingWindow);
dpiContext = User32.GetWindowDpiAwarenessContext(parkingWindow.Handle);
Assert.True(User32.AreDpiAwarenessContextsEqual(User32.DPI_AWARENESS_CONTEXT.SYSTEM_AWARE, dpiContext));
// check PMv2 parking window still available.
parkingWindow = ctx.GetParkingWindowForContext(User32.DPI_AWARENESS_CONTEXT.PER_MONITOR_AWARE_V2);
Assert.NotNull(parkingWindow);
dpiContext = User32.GetWindowDpiAwarenessContext(parkingWindow.Handle);
Assert.True(User32.AreDpiAwarenessContextsEqual(User32.DPI_AWARENESS_CONTEXT.PER_MONITOR_AWARE_V2, dpiContext));
}
}
finally
{
// reset back to original awareness context.
User32.SetThreadDpiAwarenessContext(originalAwarenessContext);
}
}
