private void InsertElement(RenderBatch batch, ContainerNode parent, int childIndex, ArraySegment <RenderTreeFrame> frames, RenderTreeFrame frame, int frameIndex)
{
// Note: we don't handle SVG here
var newElement = new ElementNode(frame.ElementName);
parent.InsertLogicalChild(newElement, childIndex);
// Apply attributes
for (var i = frameIndex + 1; i < frameIndex + frame.ElementSubtreeLength; i++)
{
var descendantFrame = batch.ReferenceFrames.Array[i];
if (descendantFrame.FrameType == RenderTreeFrameType.Attribute)
{
ApplyAttribute(batch, newElement, descendantFrame);
}
else
{
// As soon as we see a non-attribute child, all the subsequent child frames are
// not attributes, so bail out and insert the remnants recursively
InsertFrameRange(batch, newElement, 0, frames, i, frameIndex + frame.ElementSubtreeLength);
break;
}
}
}
private void ApplyEdits(RenderBatch batch, ContainerNode parent, int childIndex, ArrayBuilderSegment <RenderTreeEdit> edits)
{
var currentDepth = 0;
var childIndexAtCurrentDepth = childIndex;
var permutations = new List <PermutationListEntry>();
for (var editIndex = edits.Offset; editIndex < edits.Offset + edits.Count; editIndex++)
{
var edit = edits.Array[editIndex];
switch (edit.Type)
{
case RenderTreeEditType.PrependFrame:
{
var frame = batch.ReferenceFrames.Array[edit.ReferenceFrameIndex];
var siblingIndex = edit.SiblingIndex;
InsertFrame(batch, parent, childIndexAtCurrentDepth + siblingIndex, batch.ReferenceFrames.Array, frame, edit.ReferenceFrameIndex);
break;
}
case RenderTreeEditType.RemoveFrame:
{
var siblingIndex = edit.SiblingIndex;
parent.RemoveLogicalChild(childIndexAtCurrentDepth + siblingIndex);
break;
}
case RenderTreeEditType.SetAttribute:
{
var frame = batch.ReferenceFrames.Array[edit.ReferenceFrameIndex];
var siblingIndex = edit.SiblingIndex;
var node = parent.Children[childIndexAtCurrentDepth + siblingIndex];
if (node is ElementNode element)
{
ApplyAttribute(batch, element, frame);
}
else
{
throw new Exception("Cannot set attribute on non-element child");
}
break;
}
case RenderTreeEditType.RemoveAttribute:
{
// Note that we don't have to dispose the info we track about event handlers here, because the
// disposed event handler IDs are delivered separately (in the 'disposedEventHandlerIds' array)
var siblingIndex = edit.SiblingIndex;
var node = parent.Children[childIndexAtCurrentDepth + siblingIndex];
if (node is ElementNode element)
{
var attributeName = edit.RemovedAttributeName;
// First try to remove any special property we use for this attribute
if (!TryApplySpecialProperty(batch, element, attributeName, default))
{
// If that's not applicable, it's a regular DOM attribute so remove that
element.RemoveAttribute(attributeName);
}
}
else
{
throw new Exception("Cannot remove attribute from non-element child");
}
break;
}
case RenderTreeEditType.UpdateText:
{
var frame = batch.ReferenceFrames.Array[edit.ReferenceFrameIndex];
var siblingIndex = edit.SiblingIndex;
var node = parent.Children[childIndexAtCurrentDepth + siblingIndex];
if (node is TextNode textNode)
{
textNode.TextContent = frame.TextContent;
}
else
{
throw new Exception("Cannot set text content on non-text child");
}
break;
}
case RenderTreeEditType.UpdateMarkup:
{
var frame = batch.ReferenceFrames.Array[edit.ReferenceFrameIndex];
var siblingIndex = edit.SiblingIndex;
parent.RemoveLogicalChild(childIndexAtCurrentDepth + siblingIndex);
InsertMarkup(parent, childIndexAtCurrentDepth + siblingIndex, frame);
break;
}
case RenderTreeEditType.StepIn:
{
var siblingIndex = edit.SiblingIndex;
parent = (ContainerNode)parent.Children[childIndexAtCurrentDepth + siblingIndex];
currentDepth++;
childIndexAtCurrentDepth = 0;
break;
}
case RenderTreeEditType.StepOut:
{
parent = parent.Parent;
currentDepth--;
childIndexAtCurrentDepth = currentDepth == 0 ? childIndex : 0; // The childIndex is only ever nonzero at zero depth
break;
}
case RenderTreeEditType.PermutationListEntry:
{
permutations.Add(new PermutationListEntry(childIndexAtCurrentDepth + edit.SiblingIndex, childIndexAtCurrentDepth + edit.MoveToSiblingIndex));
break;
}
case RenderTreeEditType.PermutationListEnd:
{
throw new NotSupportedException();
//permuteLogicalChildren(parent, permutations!);
//permutations.Clear();
//break;
}
default:
{
throw new Exception($"Unknown edit type: '{edit.Type}'");
}
}
}
}
