internal void Initialize(Window window, FrameworkElement element = null)
{
if (window == null)
{
throw new ArgumentNullException(nameof(window));
}
if (!window.IsInitialized)
{
throw new InvalidOperationException("Target Window has not been initialized.");
}
_targetWindow = window;
_targetElement = element;
ForbearScaling = WillForbearScalingIfUnnecessary && BuiltinFunction.IsScalingSupported(_targetWindow);
if (IsPerMonitorDpiAware)
{
MonitorDpi = DpiChecker.GetDpiFromVisual(_targetWindow);
if (MonitorDpi.Equals(SystemDpi) || ForbearScaling)
{
WindowDpi = MonitorDpi;
}
else
{
var newInfo = new WindowInfo
{
Dpi = MonitorDpi,
Width = _targetWindow.Width * (double)MonitorDpi.X / SystemDpi.X,
Height = _targetWindow.Height * (double)MonitorDpi.Y / SystemDpi.Y,
};
Interlocked.Exchange(ref _dueInfo, newInfo);
ChangeDpi();
}
}
else
{
MonitorDpi = SystemDpi;
WindowDpi = MonitorDpi;
}
ColorProfilePath = ColorProfileChecker.GetColorProfilePath(_targetWindow);
_targetSource = PresentationSource.FromVisual(_targetWindow) as HwndSource;
_targetSource?.AddHook(WndProc);
}
/// <summary>
/// Handles window messages.
/// </summary>
/// <param name="hwnd">The window handle</param>
/// <param name="msg">The message ID</param>
/// <param name="wParam">The message's wParam value</param>
/// <param name="lParam">The message's lParam value</param>
/// <param name="handled">Whether the message was handled</param>
/// <returns>Return value depending on the particular message</returns>
/// <remarks>This is an implementation of System.Windows.Interop.HwndSourceHook.</remarks>
protected virtual IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
switch (msg)
{
case (int)WindowMessage.WM_DPICHANGED:
var newDpi = new Dpi(
NativeMacro.GetLoWord((uint)wParam),
NativeMacro.GetHiWord((uint)wParam));
Debug.WriteLine($"DPICHANGED: {MonitorDpi.X} -> {newDpi.X}");
if (MonitorDpi.Equals(newDpi))
{
break;
}
var oldDpi = MonitorDpi;
MonitorDpi = newDpi;
if (ForbearScaling)
{
WindowDpi = MonitorDpi;
break;
}
_isDpiChanged = true;
var newInfo = new WindowInfo {
Dpi = MonitorDpi
};
switch (_currentStatus)
{
case WindowStatus.None:
case WindowStatus.LocationChanged:
if ((_baseSize == Size.Empty) || (_currentStatus == WindowStatus.None))
{
_baseSize = new Size(_targetWindow.Width, _targetWindow.Height);
}
_baseSize = new Size(
_baseSize.Width * (double)MonitorDpi.X / oldDpi.X,
_baseSize.Height * (double)MonitorDpi.Y / oldDpi.Y);
newInfo.Size = _baseSize;
break;
case WindowStatus.SizeChanged:
// None.
break;
}
Interlocked.Exchange(ref _dueInfo, newInfo);
switch (_currentStatus)
{
case WindowStatus.None:
ChangeDpi();
break;
case WindowStatus.LocationChanged:
// None.
break;
case WindowStatus.SizeChanged:
ChangeDpi(WindowStatus.SizeChanged);
break;
}
handled = true;
break;
case (int)WindowMessage.WM_ENTERSIZEMOVE:
Debug.WriteLine("ENTERSIZEMOVE");
if (!IsPerMonitorDpiAware || ForbearScaling)
{
break;
}
_baseSize = new Size(_targetWindow.Width, _targetWindow.Height);
_isEnteredSizeMove = true;
_isDpiChanged = false;
_countLocationChanged = 0;
_countSizeChanged = 0;
break;
case (int)WindowMessage.WM_EXITSIZEMOVE:
Debug.WriteLine("EXITSIZEMOVE");
if (_isEnteredSizeMove)
{
_isEnteredSizeMove = false;
// Last stand!!!
if (_isDpiChanged && (_currentStatus == WindowStatus.LocationChanged))
{
var lastInfo = new WindowInfo
{
Dpi = MonitorDpi,
Size = _baseSize,
};
Interlocked.Exchange(ref _dueInfo, lastInfo);
ChangeDpi(WindowStatus.LocationChanged);
}
_currentStatus = WindowStatus.None;
}
ChangeColorProfilePath();
break;
case (int)WindowMessage.WM_MOVE:
Debug.WriteLine("MOVE");
if (_isEnteredSizeMove)
{
_countLocationChanged++;
if (_countLocationChanged > _countSizeChanged)
{
_currentStatus = WindowStatus.LocationChanged;
}
ChangeDpi(WindowStatus.LocationChanged);
}
break;
case (int)WindowMessage.WM_SIZE:
if ((uint)wParam != NativeMethod.SIZE_RESTORED)
{
break;
}
Debug.WriteLine("SIZE");
if (_isEnteredSizeMove)
{
_countSizeChanged++;
if (_countLocationChanged < _countSizeChanged)
{
_currentStatus = WindowStatus.SizeChanged;
}
// DPI change by resize will be managed when WM_DPICHANGED comes.
}
break;
}
return(IntPtr.Zero);
}