private Task <ObservableDiagram> RenderChordAsync(IChordFinderResult result)
{
return(Task <ObservableDiagram> .Factory.StartNew(() =>
{
ObservableDiagram od = null;
AppVM.AppView.DoOnUIThread(() =>
{
try
{
od = new ObservableDiagram(result.ToDiagram(Style), name: Strings.FinderResultDiagramName);
od.PostEditCallback = (changed) =>
{
if (changed)
{
od.Refresh();
}
};
}
catch (Exception ex)
{
ExceptionUtils.HandleException(ex);
}
});
return od;
}));
}
private Action <bool> GetDiagramPostEditCallback(ObservableDiagram od)
{
ObservableDiagram originalObservableDiagram = od;
Diagram originalDiagram = od.Diagram;
return((changed) =>
{
if (changed)
{
if (Collection.Contains(originalDiagram))
{
// We edited an existing diagram, so we need to replace the pre-edited Diagram still in the library
// with the newly minted Diagram from the editor
Collection.Replace(originalDiagram, originalObservableDiagram.Diagram);
}
else
{
// This was a new diagram, so we need to add it to the library collection
Collection.Add(originalObservableDiagram.Diagram);
// Then add it to the list of visible diagrams
Diagrams.Add(originalObservableDiagram);
}
// Now we need to refresh the individual image
originalObservableDiagram.Refresh();
// Now that the internal Diagram has changed, we need to rebuild the callback so that the new Diagram is
// cached correctly for any future calls to edit this od
originalObservableDiagram.PostEditCallback = GetDiagramPostEditCallback(originalObservableDiagram);
}
});
}