public UpdateState(
DeferredDrawingContextImpl owner,
VisualNode?node,
int childIndex,
int drawOperationIndex)
{
Owner = owner;
Node = node;
ChildIndex = childIndex;
DrawOperationIndex = drawOperationIndex;
}
/// <inheritdoc/>
public void UpdateAll(Scene scene)
{
Contract.Requires <ArgumentNullException>(scene != null);
Dispatcher.UIThread.VerifyAccess();
UpdateSize(scene);
scene.Layers.GetOrAdd(scene.Root.Visual);
using (var impl = new DeferredDrawingContextImpl(this, scene.Layers))
using (var context = new DrawingContext(impl))
{
Update(context, scene, (VisualNode)scene.Root, scene.Root.Visual.Bounds, true);
}
}
/// <inheritdoc/>
public void UpdateAll(Scene scene)
{
_ = scene ?? throw new ArgumentNullException(nameof(scene));
Dispatcher.UIThread.VerifyAccess();
UpdateSize(scene);
scene.Layers.GetOrAdd(scene.Root.Visual);
using (var impl = new DeferredDrawingContextImpl(this, scene.Layers))
using (var context = new DrawingContext(impl))
{
var clip = new Rect(scene.Root.Visual.Bounds.Size);
Update(context, scene, (VisualNode)scene.Root, clip, true);
}
}
/// <inheritdoc/>
public bool Update(Scene scene, IVisual visual)
{
Contract.Requires <ArgumentNullException>(scene != null);
Contract.Requires <ArgumentNullException>(visual != null);
Dispatcher.UIThread.VerifyAccess();
if (!scene.Root.Visual.IsVisible)
{
throw new AvaloniaInternalException("Cannot update the scene for an invisible root visual.");
}
var node = (VisualNode)scene.FindNode(visual);
if (visual == scene.Root.Visual)
{
UpdateSize(scene);
}
if (visual.VisualRoot != null)
{
if (visual.IsVisible)
{
// If the node isn't yet part of the scene, find the nearest ancestor that is.
node = node ?? FindExistingAncestor(scene, visual);
// We don't need to do anything if this part of the tree has already been fully
// updated.
if (node != null && !node.SubTreeUpdated)
{
// If the control we've been asked to update isn't part of the scene then
// we're carrying out an add operation, so recurse and add all the
// descendents too.
var recurse = node.Visual != visual;
using (var impl = new DeferredDrawingContextImpl(this, scene.Layers))
using (var context = new DrawingContext(impl))
{
var clip = scene.Root.Visual.Bounds;
if (node.Parent != null)
{
context.PushPostTransform(node.Parent.Transform);
clip = node.Parent.ClipBounds;
}
using (context.PushTransformContainer())
{
Update(context, scene, node, clip, recurse);
}
}
return(true);
}
}
else
{
if (node != null)
{
// The control has been hidden so remove it from its parent and deindex the
// node and its descendents.
((VisualNode)node.Parent)?.RemoveChild(node);
Deindex(scene, node);
return(true);
}
}
}
else if (node != null)
{
// The control has been removed so remove it from its parent and deindex the
// node and its descendents.
var trim = FindFirstDeadAncestor(scene, node);
((VisualNode)trim.Parent).RemoveChild(trim);
Deindex(scene, trim);
return(true);
}
return(false);
}