public static Preview OrderNew(GeometricElement element)
{
if (!element.IsValid)
{
return(null);
}
if (previewsQueue is null)
{
previewsQueue = new List <Preview>();
Revit.EnqueueReadAction((doc, cancel) => BuildPreviews(doc, cancel));
}
var preview = new Preview(element);
previewsQueue.Add(preview);
return(preview);
}
static void BuildPreviews(DB.Document document, bool cancelled, List <Preview> previews)
{
if (cancelled)
{
return;
}
var stopWatch = new Stopwatch();
int count = 0;
while ((count = previews.Count) > 0)
{
// Draw the biggest elements first.
// The biggest element ia at the end of previews List, this way no realloc occurs when removing it
int last = count - 1;
var preview = previews[last];
previews.RemoveAt(last);
stopWatch.Start();
preview.Build(document);
stopWatch.Stop();
// If building those previews take use more than 200 ms we return to Revit, to keep it 'interactive'.
if (stopWatch.ElapsedMilliseconds > 200)
{
break;
}
}
// RhinoDoc.ActiveDoc.Views.Redraw is synchronous :(
// better use RhinoView.Redraw that just invalidate the view, the OS will update it when possible
foreach (var view in Rhino.RhinoDoc.ActiveDoc.Views)
{
view.Redraw();
}
// If there are pending previews to generate enqueue BuildPreviews again
if (previews.Count > 0)
{
Revit.EnqueueReadAction((doc, cancel) => BuildPreviews(doc, cancel, previews));
}
}
