Text-Grab/NativeHelpers/PerMonitorDPIWindow.h

//// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
//// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
//// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
//// PARTICULAR PURPOSE.
////
//// Copyright (c) Microsoft Corporation. All rights reserved


#pragma once
#include "PerMonitorDPIHelpers.h"
using namespace System;
using namespace System::Windows::Interop;
using namespace System::Windows;
using namespace System::Windows::Media;
using namespace System::Security::Permissions;

namespace NativeHelpers 
{
	public ref class PerMonitorDPIWindow : public Window
	{
	public:
		PerMonitorDPIWindow(void);

		event EventHandler^ DPIChanged;

		System::String^ GetCurrentDpiConfiguration();

		property double CurrentDPI
		{
			double get() 
			{
				return m_currentDPI;
			}
		}

		property double WpfDPI
		{
			double get() 
			{
				return m_wpfDPI;
			}
			void set(double value) 
			{
				m_wpfDPI = value;
			}
		}

		property double ScaleFactor
		{
			double get()
			{
				return m_scaleFactor;
			}
		}

	protected:
		~PerMonitorDPIWindow();
		
		[EnvironmentPermissionAttribute(SecurityAction::LinkDemand, Unrestricted = true)]
		void OnLoaded(Object^ sender, RoutedEventArgs^ args);		
		
		void OnDPIChanged();		
		
		void UpdateLayoutTransform(double scaleFactor);
		
		IntPtr HandleMessages(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, bool %handled);

	private:
		System::Boolean m_perMonitorEnabled;
		
		double m_currentDPI;		
		
		double m_systemDPI;
		
		double m_wpfDPI;
		
		double m_scaleFactor;		
		
		System::Windows::Interop::HwndSource^ m_source;
	};
}