bool TryGetInvertedTransform(CompositionVisual visual, out Matrix matrix)
{
var m = visual.TryGetServerGlobalTransform();
if (m == null)
{
matrix = default;
return(false);
}
var m33 = MatrixUtils.ToMatrix(m.Value);
return(m33.TryInvert(out matrix));
}
/// <summary>
/// Attempts to transform a point to a particular CompositionVisual coordinate space
/// </summary>
/// <returns></returns>
public Point?TryTransformToVisual(CompositionVisual visual, Point point)
{
if (visual.Root != this)
{
return(null);
}
var v = visual;
var m = Matrix.Identity;
while (v != null)
{
if (!TryGetInvertedTransform(v, out var cm))
{
return(null);
}
m = m * cm;
v = v.Parent;
}
return(point * m);
}
void HitTestCore(CompositionVisual visual, Point globalPoint, PooledList <CompositionVisual> result,
Func <IVisual, bool>?filter)
{
if (visual.Visible == false)
{
return;
}
if (!TryTransformTo(visual, globalPoint, out var point))
{
return;
}
if (visual.ClipToBounds &&
(point.X < 0 || point.Y < 0 || point.X > visual.Size.X || point.Y > visual.Size.Y))
{
return;
}
if (visual.Clip?.FillContains(point) == false)
{
return;
}
// Inspect children
if (visual is CompositionContainerVisual cv)
{
for (var c = cv.Children.Count - 1; c >= 0; c--)
{
var ch = cv.Children[c];
HitTestCore(ch, globalPoint, result, filter);
}
}
// Hit-test the current node
if (visual.HitTest(point, filter))
{
result.Add(visual);
}
}
partial void OnRemoved(CompositionVisual item) => item.Parent = null;
partial void OnAdded(CompositionVisual item) => item.Parent = _owner;
public void InsertAtBottom(CompositionVisual newChild) => Insert(0, newChild);
public void InsertAtTop(CompositionVisual newChild) => Insert(_list.Count, newChild);
internal CompositionVisualCollection(CompositionVisual parent, ServerCompositionVisualCollection server) : base(parent.Compositor, server)
{
_owner = parent;
InitializeDefaults();
}