protected override void OnWindowPositionChanged(Rect rcBoundingBox)
{
base.OnWindowPositionChanged(rcBoundingBox);
if (ParentScrollViewer == null)
{
return;
}
try
{
GeneralTransform tr = ParentScrollViewer.TransformToAncestor(MainWindow);
var scrollRect = new Rect(new Size(ParentScrollViewer.ViewportWidth, ParentScrollViewer.ViewportHeight));
scrollRect = tr.TransformBounds(scrollRect);
var intersect = Rect.Intersect(scrollRect, rcBoundingBox);
if (!intersect.IsEmpty)
{
tr = MainWindow.TransformToDescendant(this);
intersect = tr.TransformBounds(intersect);
}
SetRegion(intersect);
}
catch (Exception e)
{
Console.WriteLine($"{e.GetType().ToString()}: {e.Message}");
}
}
protected override void OnWindowPositionChanged(Rect rcBoundingBox)
{
if (_lastBoundingBox.Equals(rcBoundingBox))
{
return;
}
_lastBoundingBox = rcBoundingBox;
Graphics g = this.Child.CreateGraphics();
double xScale = g.DpiX / 96.0;
double yScale = g.DpiY / 96.0;
base.OnWindowPositionChanged(rcBoundingBox);
//rcBoundingBox = new Rect(new Point(rcBoundingBox.X, rcBoundingBox.Y), new Size( rcBoundingBox.Width, rcBoundingBox.Height));
if (ParentScrollViewer == null && !TryFindScrollViewer())
{
return;
}
GeneralTransform tr = ParentScrollViewer.TransformToAncestor(MainWindow);
var scrollRect = new Rect(new Size(ParentScrollViewer.ViewportWidth, ParentScrollViewer.ViewportHeight));
scrollRect = tr.TransformBounds(scrollRect);
scrollRect = new Rect(new Point(scrollRect.X * xScale, scrollRect.Y * yScale), new Size(scrollRect.Width * xScale, scrollRect.Height * yScale));
var intersect = Rect.Intersect(scrollRect, rcBoundingBox);
if (intersect.Equals(rcBoundingBox))
{
if (!_fullyIntersect)
{
InvalidateVisual();
}
_fullyIntersect = true;
}
else
{
_fullyIntersect = false;
}
if (!intersect.IsEmpty)
{
tr = MainWindow.TransformToDescendant(this);
intersect = new Rect(new Point(intersect.X / xScale, intersect.Y / yScale), new Size(intersect.Width / xScale, intersect.Height / yScale));
intersect = tr.TransformBounds(intersect);
intersect = new Rect(new Point(intersect.X * xScale, intersect.Y * yScale), new Size(intersect.Width * xScale, intersect.Height * yScale));
//InvalidateVisual();
}
SetRegion(intersect);
}
