private void UpdateWMStyles(Action change)
{
var oldDecorated = _decorated;
var oldThickness = BorderThickness;
change();
var style = (WindowStyles)GetWindowLong(_hwnd, (int)WindowLongParam.GWL_STYLE);
const WindowStyles controlledFlags = WindowStyles.WS_OVERLAPPEDWINDOW;
style = style | controlledFlags ^ controlledFlags;
style |= WindowStyles.WS_OVERLAPPEDWINDOW;
if (!_decorated)
{
style ^= (WindowStyles.WS_CAPTION | WindowStyles.WS_SYSMENU);
}
if (!_resizable)
{
style ^= (WindowStyles.WS_SIZEFRAME);
}
GetClientRect(_hwnd, out var oldClientRect);
var oldClientRectOrigin = new UnmanagedMethods.POINT();
ClientToScreen(_hwnd, ref oldClientRectOrigin);
oldClientRect.Offset(oldClientRectOrigin);
SetWindowLong(_hwnd, (int)WindowLongParam.GWL_STYLE, (uint)style);
UnmanagedMethods.GetWindowRect(_hwnd, out var windowRect);
bool frameUpdated = false;
if (oldDecorated != _decorated)
{
var newRect = oldClientRect;
if (_decorated)
{
AdjustWindowRectEx(ref newRect, (uint)style, false,
GetWindowLong(_hwnd, (int)WindowLongParam.GWL_EXSTYLE));
}
SetWindowPos(_hwnd, IntPtr.Zero, newRect.left, newRect.top, newRect.Width, newRect.Height,
SetWindowPosFlags.SWP_NOZORDER | SetWindowPosFlags.SWP_NOACTIVATE | SetWindowPosFlags.SWP_FRAMECHANGED);
frameUpdated = true;
}
if (!frameUpdated)
{
SetWindowPos(_hwnd, IntPtr.Zero, 0, 0, 0, 0,
SetWindowPosFlags.SWP_FRAMECHANGED | SetWindowPosFlags.SWP_NOZORDER |
SetWindowPosFlags.SWP_NOACTIVATE
| SetWindowPosFlags.SWP_NOMOVE | SetWindowPosFlags.SWP_NOSIZE);
}
}
protected override Point GetClientPosition()
{
IntPtr handle = ((HwndSource)ActiveSource).Handle;
UnmanagedMethods.POINT p = this.cursorPos;
UnmanagedMethods.ScreenToClient(handle, ref p);
return(new Point(p.X, p.Y));
}
private Point ScreenToClient(Point point)
{
var p = new UnmanagedMethods.POINT {
X = (int)point.X, Y = (int)point.Y
};
UnmanagedMethods.ScreenToClient(_hwnd, ref p);
return(new Point(p.X, p.Y));
}
public Point PointToClient(PixelPoint point)
{
var p = new UnmanagedMethods.POINT {
X = (int)point.X, Y = (int)point.Y
};
UnmanagedMethods.ScreenToClient(_hwnd, ref p);
return(new Point(p.X, p.Y) / Scaling);
}
public Point PointToScreen(Point point)
{
var p = new UnmanagedMethods.POINT {
X = (int)point.X, Y = (int)point.Y
};
UnmanagedMethods.ClientToScreen(_hwnd, ref p);
return(new Point(p.X, p.Y));
}
private Point ScreenToClient(uint x, uint y)
{
var p = new UnmanagedMethods.POINT {
X = (int)x, Y = (int)y
};
UnmanagedMethods.ScreenToClient(this.hwnd, ref p);
return(new Point(p.X, p.Y));
}
public override Point PointToScreen(Point p)
{
UnmanagedMethods.POINT result = new UnmanagedMethods.POINT
{
X = (int)p.X,
Y = (int)p.Y,
};
UnmanagedMethods.ClientToScreen(this.Handle, ref result);
return(new Point(result.X, result.Y));
}
unsafe void Win32Com.IDropTarget.DragOver(int grfKeyState, UnmanagedMethods.POINT pt, DropEffect *pdwEffect)
{
var dispatch = _tl?.Input;
if (dispatch == null)
{
*pdwEffect = (int)DropEffect.None;
}
var args = new RawDragEvent(
_dragDevice,
RawDragEventType.DragOver,
_target,
GetDragLocation(pt),
_currentDrag,
ConvertDropEffect(*pdwEffect),
ConvertKeyState(grfKeyState)
);
dispatch(args);
*pdwEffect = ConvertDropEffect(args.Effects);
}
private Point GetDragLocation(UnmanagedMethods.POINT dragPoint)
{
var screenPt = new PixelPoint(dragPoint.X, dragPoint.Y);
return(_target.PointToClient(screenPt));
}
unsafe void Win32Com.IDropTarget.Drop(Win32Com.IDataObject pDataObj, int grfKeyState, UnmanagedMethods.POINT pt, DropEffect *pdwEffect)
{
try
{
var dispatch = _tl?.Input;
if (dispatch == null)
{
*pdwEffect = (int)DropEffect.None;
}
SetDataObject(pDataObj);
var args = new RawDragEvent(
_dragDevice,
RawDragEventType.Drop,
_target,
GetDragLocation(pt),
_currentDrag,
ConvertDropEffect(*pdwEffect),
ConvertKeyState(grfKeyState)
);
dispatch(args);
*pdwEffect = ConvertDropEffect(args.Effects);
}
finally
{
ReleaseDataObject();
}
}