public override HistoryMemento OnExecute(IHistoryWorkspace historyWorkspace)
{
if (historyWorkspace.Selection.IsEmpty)
{
return(null);
}
SelectionHistoryMemento memento = new SelectionHistoryMemento(StaticName, StaticImage, historyWorkspace);
GeometryList selectedPath = historyWorkspace.Selection.GetCachedGeometryList();
SelectionRenderingQuality selectionRenderingQuality = historyWorkspace.ToolSettings.Selection.RenderingQuality.Value;
Result <IReadOnlyList <RectInt32> > selectedPathScansLazy = historyWorkspace.Selection.GetCachedLazyClippingMaskScans();
RectInt32 documentBounds = historyWorkspace.Document.Bounds();
Func <GeometryList> invertedPathFn = delegate {
if ((selectionRenderingQuality == SelectionRenderingQuality.Aliased) || selectedPath.IsPixelated)
{
GeometryList list2 = GeometryList.FromNonOverlappingSortedScans(selectedPathScansLazy.Value);
list2.AddRect(documentBounds);
SegmentedList <RectInt32> scans = new SegmentedList <RectInt32>();
foreach (RectInt32 num in list2.EnumerateInteriorScans())
{
if (documentBounds.Contains(num))
{
scans.Add(num);
}
else if (documentBounds.IntersectsWith(num))
{
scans.Add(RectInt32.Intersect(documentBounds, num));
}
}
return(GeometryList.FromNonOverlappingScans(scans));
}
GeometryList lhs = documentBounds.Contains(selectedPath.Bounds) ? selectedPath : GeometryList.ClipToRect(selectedPath, documentBounds);
return(GeometryList.Combine(lhs, GeometryCombineMode.Xor, documentBounds));
};
ThreadTask <GeometryList> task = historyWorkspace.TaskManager.StartNewThreadTask <GeometryList>(task => invertedPathFn(), ApartmentState.MTA);
ManualResetEvent taskFinishedEvent = new ManualResetEvent(false);
task.ResultAsync <GeometryList>().Receive(delegate(Result <GeometryList> r) {
taskFinishedEvent.Set();
}).Observe();
if (!taskFinishedEvent.WaitOne(0x3e8))
{
using (TaskProgressDialog dialog = new TaskProgressDialog())
{
dialog.Task = task;
dialog.Text = StaticName;
dialog.Icon = StaticImage.Reference.ToIcon();
dialog.HeaderText = PdnResources.GetString("SaveConfigDialog.Finishing.Text");
dialog.ShowDialog(historyWorkspace.Window);
}
}
Result <GeometryList> taskResult = task.TaskResult;
if (taskResult.IsError)
{
if (taskResult.Error is OutOfMemoryException)
{
throw new OutOfMemoryException(null, taskResult.Error);
}
throw new AggregateException(null, taskResult.Error);
}
GeometryList geometry = task.TaskResult.Value;
base.EnterCriticalRegion();
using (historyWorkspace.Selection.UseChangeScope())
{
historyWorkspace.Selection.Reset();
geometry.Freeze();
historyWorkspace.Selection.SetContinuation(geometry, SelectionCombineMode.Replace);
historyWorkspace.Selection.CommitContinuation();
}
return(memento);
}