internal ScrollTraceRecord(ScrollTraceOp op, VirtualizingStackPanel vsp,
int vspDepth, int itemIndex, int opDepth, string detail)
{
Op = op;
VSP = vsp;
VDepth = vspDepth;
ItemIndex = itemIndex;
OpDepth = opDepth;
Detail = detail;
}
private static bool ShouldIgnore(ScrollTraceOp op, ScrollTracingInfo sti)
{
return (op == ScrollTraceOp.NoOp);
}
private void AddTrace(VirtualizingStackPanel vsp, ScrollTraceOp op, ScrollTracingInfo sti, params object[] args)
{
ScrollTraceRecord record = new ScrollTraceRecord(op, vsp, sti.Depth, sti.ItemIndex, _depth, BuildDetail(args));
_traceList.Add(record);
switch (op)
{
default:
break;
case ScrollTraceOp.BeginMeasure:
Push();
break;
case ScrollTraceOp.EndMeasure:
Pop(record);
record.Snapshot = vsp.TakeSnapshot();
Flush(sti.Depth);
break;
case ScrollTraceOp.BeginArrange:
Push();
break;
case ScrollTraceOp.EndArrange:
Pop(record);
record.Snapshot = vsp.TakeSnapshot();
Flush(sti.Depth);
break;
case ScrollTraceOp.BSetAnchor:
Push();
break;
case ScrollTraceOp.ESetAnchor:
Pop(record);
break;
case ScrollTraceOp.BOnAnchor:
Push();
break;
case ScrollTraceOp.ROnAnchor:
Pop(record);
break;
case ScrollTraceOp.SOnAnchor:
Pop();
break;
case ScrollTraceOp.EOnAnchor:
Pop(record);
break;
case ScrollTraceOp.RecycleChildren:
case ScrollTraceOp.RemoveChildren:
record.RevirtualizedChildren = args[2] as List<String>;
break;
}
if (_flushDepth < 0)
{
Flush(_flushDepth);
}
}
internal static void Trace(VirtualizingStackPanel vsp, ScrollTraceOp op, params object[] args)
{
ScrollTracingInfo sti = ScrollTracingInfoField.GetValue(vsp);
ScrollTracer tracer = sti.ScrollTracer;
Debug.Assert(tracer != null, "Trace called when not tracing");
if (ShouldIgnore(op, sti))
return;
tracer.AddTrace(vsp, op, sti, args);
}
