public static void SetAdornedElement(Visual adorner, Visual adorned)
{
adorner.SetValue(AdornedElementProperty, adorned);
}
private void UpdateAdornedElement(Visual adorner, Visual adorned)
{
var info = adorner.GetValue(s_adornedElementInfoProperty);
if (info != null)
{
info.Subscription.Dispose();
if (adorned == null)
{
adorner.ClearValue(s_adornedElementInfoProperty);
}
}
if (adorned != null)
{
if (info == null)
{
info = new AdornedElementInfo();
adorner.SetValue(s_adornedElementInfoProperty, info);
}
info.Subscription = _tracker.Track(adorned).Subscribe(x =>
{
info.Bounds = x;
InvalidateArrange();
});
}
}
public override bool ApplyTemplate()
{
if (this.IsInitialized && this.visualChild == null)
{
Visual visual = this.Content as Visual;
if (visual == null && this.Content != null)
{
DataTemplate template = this.ContentTemplate;
if (template == null)
{
DataTemplateKey key = new DataTemplateKey(this.Content.GetType());
template = this.TryFindResource(key) as DataTemplate;
}
if (template != null)
{
visual = template.CreateVisualTree(this);
FrameworkElement fe = visual as FrameworkElement;
if (fe != null)
{
fe.DataContext = this.Content;
}
}
else
{
visual = new TextBlock
{
Text = this.Content.ToString(),
};
}
}
if (visual != null)
{
this.visualChild = visual;
this.AddVisualChild(this.visualChild);
this.OnApplyTemplate();
return true;
}
}
return false;
}
public static Visual GetAdornedElement(Visual adorner)
{
return adorner.GetValue(AdornedElementProperty);
}
/// <summary> /// Gets the transformed bounds of the visual. /// </summary> /// <param name="visual">The visual.</param> /// <returns>The transformed bounds.</returns> public static TransformedBounds GetTransformedBounds(Visual visual) => visual.GetValue(TransformedBoundsProperty);
private void ContentChanged(object oldValue, object newValue)
{
if (oldValue != null)
{
this.RemoveLogicalChild(oldValue);
this.RemoveVisualChild(this.visualChild);
this.visualChild = null;
}
if (newValue != null)
{
this.AddLogicalChild(newValue);
}
this.ApplyTemplate();
}
/// <summary>
/// Starts tracking the specified visual.
/// </summary>
/// <param name="visual">The visual.</param>
/// <returns>An observable that returns the tracked bounds.</returns>
public IObservable<TransformedBounds> Track(Visual visual)
{
return visual.GetObservable(TransformedBoundsProperty);
}
internal static void SetTransformedBounds(Visual visual, TransformedBounds bounds)
{
visual.SetValue(TransformedBoundsProperty, bounds);
}
public PointHitTestResult(Visual visualHit, Point pointHit)
{
this.VisualHit = visualHit;
this.PointHit = pointHit;
}
/// <summary>
/// Removes a child <see cref="Visual"/> from the visual tree.
/// </summary>
/// <param name="child">The child visual.</param>
protected internal void RemoveVisualChild(Visual child)
{
child.VisualParent = null;
child.DependencyParent = null;
}
/// <summary>
/// Adds a child <see cref="Visual"/> to the visual tree.
/// </summary>
/// <param name="child">The child visual.</param>
protected internal void AddVisualChild(Visual child)
{
if (child == null)
{
throw new ArgumentNullException("child");
}
DependencyObject oldParent = child.VisualParent;
child.DependencyParent = this;
child.VisualParent = this;
child.OnVisualParentChanged(oldParent);
}
/// <summary>
/// Removes a child <see cref="Visual"/> from the visual tree.
/// </summary>
/// <param name="child">The child visual.</param>
protected internal void RemoveVisualChild(Visual child)
{
child.VisualParent = null;
child.DependencyParent = null;
}
public sealed override bool ApplyTemplate()
{
if (this.IsInitialized && this.child == null)
{
if (this.Template == null)
{
this.ApplyTheme();
}
if (this.Template != null)
{
this.child = this.Template.CreateVisualTree(this);
this.AddVisualChild(this.child);
this.OnApplyTemplate();
return true;
}
}
return false;
}
