private Visual DisposeChildren(IRenderContext ctx, Visual removedVisual, bool dispose)
{
var container = removedVisual as VisualGroup;
if (container != null && container.Children.Count > 0)
{
ctx.ChildVisualRemoved(container.Children[0]);
}
return(null);
}
/// <summary>
/// Updates a visual which rotates the visualization of the wrapped style.
/// </summary>
protected override VisualGroup UpdateVisual(IRenderContext context, VisualGroup oldVisual, INode node)
{
var container = oldVisual as RotatableNodeStyleVisual;
if (container == null || container.Children == null || container.Children.Count != 1)
{
return(CreateVisual(context, node));
}
var oldWrappedStyle = container.WrappedStyle;
var newWrappedStyle = Wrapped;
var creator = newWrappedStyle.Renderer.GetVisualCreator(node, newWrappedStyle);
IVisual oldWrappedVisual = container.Children[0];
IVisual newWrappedVisual;
if (newWrappedStyle != oldWrappedStyle)
{
newWrappedVisual = creator != null?creator.CreateVisual(context) : null;
}
else
{
newWrappedVisual = creator != null?creator.UpdateVisual(context, oldWrappedVisual) : null;
}
if (oldWrappedVisual != newWrappedVisual)
{
container.Children[0] = newWrappedVisual;
context.ChildVisualRemoved(oldWrappedVisual);
}
context.RegisterForChildrenIfNecessary(oldVisual, DisposeChildren);
var center = node.Layout.GetCenter();
if (newWrappedStyle != oldWrappedStyle || container.Angle != Angle || !container.Center.Equals(center))
{
var rotation = container.Transform;
rotation.Reset();
rotation.RotateAt((float)-Angle, new PointF((float)center.X, (float)center.Y));
container.WrappedStyle = newWrappedStyle;
container.Center = center;
container.Angle = -Angle;
}
return(container);
}
/// <summary>
/// Updates a visual which rotates the visualization of the wrapped style.
/// </summary>
protected override VisualGroup UpdateVisual(IRenderContext context, VisualGroup oldVisual, INode node)
{
if (oldVisual.Children == null || oldVisual.Children.Count != 1)
{
return(CreateVisual(context, node));
}
var cache = oldVisual.GetRenderDataCache <RotateRenderData>();
var oldWrappedStyle = cache.WrappedStyle;
var newWrappedStyle = Wrapped;
var creator = newWrappedStyle.Renderer.GetVisualCreator(node, newWrappedStyle);
Visual oldWrappedVisual = oldVisual.Children[0];
Visual newWrappedVisual;
if (newWrappedStyle != oldWrappedStyle)
{
newWrappedVisual = creator != null?creator.CreateVisual(context) : null;
}
else
{
newWrappedVisual = creator != null?creator.UpdateVisual(context, oldWrappedVisual) : null;
}
if (oldWrappedVisual != newWrappedVisual)
{
oldVisual.Children[0] = newWrappedVisual;
context.ChildVisualRemoved(oldWrappedVisual);
}
context.RegisterForChildrenIfNecessary(oldVisual, DisposeChildren);
var center = node.Layout.GetCenter();
if (newWrappedStyle != oldWrappedStyle || cache.Angle != Angle || !cache.Center.Equals(center))
{
var transform = (RotateTransform)oldVisual.RenderTransform;
transform.CenterX = center.X;
transform.CenterY = center.Y;
transform.Angle = -Angle;
oldVisual.SetRenderDataCache(new RotateRenderData(newWrappedStyle, Angle, center));
}
return(oldVisual);
}