protected void redepthChild(AbstractNodeMixinDiagnosticableTree child)
{
D.assert(child.owner == this.owner);
if (child._depth <= this._depth)
{
child._depth = this._depth + 1;
child.redepthChildren();
}
}
protected virtual void dropChild(AbstractNodeMixinDiagnosticableTree child)
{
D.assert(child != null);
D.assert(child._parent == this);
D.assert(child.attached == this.attached);
child._parent = null;
if (this.attached)
{
child.detach();
}
}
protected virtual void adoptChild(AbstractNodeMixinDiagnosticableTree child)
{
D.assert(child != null);
D.assert(child._parent == null);
D.assert(() => {
var node = this;
while (node.parent != null)
{
node = node.parent;
}
D.assert(node != child); // indicates we are about to create a cycle
return(true);
});
child._parent = this;
if (this.attached)
{
child.attach(this._owner);
}
this.redepthChild(child);
}