/// <summary>
/// Attach a DpiHandler to the specified window
/// </summary>
/// <param name="window">Windows</param>
/// <param name="dpiHandler">DpiHandler</param>
private static void AttachDpiHandler(Window window, DpiHandler dpiHandler)
{
if (Log.IsVerboseEnabled())
{
Log.Verbose().WriteLine("Registering the UpdateLayoutTransform subscription for {0}", window.GetType());
}
// Add the layout transform action
var transformSubscription = dpiHandler.OnDpiChanged.Subscribe(dpiChangeInfo => window.UpdateLayoutTransform((double)dpiChangeInfo.NewDpi / DpiHandler.DefaultScreenDpi));
window.WinProcMessages().Subscribe(message =>
{
dpiHandler.HandleWindowMessages(message);
switch (message.Message)
{
case WindowsMessages.WM_NCCREATE:
// Apply scaling 1x time
window.UpdateLayoutTransform((double)NativeDpiMethods.GetDpi(message.Handle) / DpiHandler.DefaultScreenDpi);
break;
case WindowsMessages.WM_DESTROY:
// Remove layout transform
if (Log.IsVerboseEnabled())
{
Log.Verbose().WriteLine("Removing the UpdateLayoutTransform subscription for {0}", window.GetType());
}
transformSubscription.Dispose();
break;
}
});
}
/// <summary>
/// Handle DPI changes for the specified Form
/// Using this DOES NOT enable dpi scaling in the non client area, for this you will need to call:
/// DpiHandler.TryEnableNonClientDpiScaling(this.Handle) from the WndProc in the WM_NCCREATE message.
/// It's better to extend DpiAwareForm, which does this for you.
/// </summary>
/// <param name="form">Control</param>
/// <returns>DpiHandler</returns>
public static DpiHandler AttachDpiHandler(this Form form)
{
// Create a DpiHandler which runs "outside" of the form (not via WinProc)
var dpiHandler = new DpiHandler(true);
dpiHandler.MessageHandler = form.WinProcFormsMessages().Subscribe(message => dpiHandler.HandleWindowMessages(message));
return(dpiHandler);
}