/// <summary>
/// Counts the number of all collection items of node output and if specified
/// it generates appropriate view model for compact preview bubble
/// </summary>
/// <param name="mirrorData">Data which represents the value of node output</param>
/// <param name="generateViewModel">Flag to not create unused view models</param>
/// <returns><cref name="CompactBubbleViewModel"/> instance
/// if <paramref name="generateViewModel"/> is specified. Otherwise, null</returns>
private static CompactBubbleViewModel ProcessThing(MirrorData mirrorData, bool generateViewModel)
{
if (mirrorData == null)
{
return generateViewModel ? new CompactBubbleViewModel(Resources.NullString, 0) : null;
}
if (mirrorData.IsCollection)
{
var list = mirrorData.GetElements();
foreach (var item in list)
{
ProcessThing(item, false);
}
return generateViewModel
? new CompactBubbleViewModel(true)
{
NodeLabel = list.Any() ? "List" : "Empty List"
}
: null;
}
items++;
if (!generateViewModel) return null;
var viewModel = new CompactBubbleViewModel(false);
if (mirrorData.Data == null && !mirrorData.IsNull && mirrorData.Class != null)
{
viewModel.NodeLabel = mirrorData.Class.ClassName;
}
else if (mirrorData.Data is Enum)
{
viewModel.NodeLabel = ((Enum)mirrorData.Data).GetDescription();
}
else
{
// Cut StringData so that only the type name remains
// for example, "Point (Z = 0.000, Y = 0.000, Z = 0.000)" -> "Point"
viewModel.NodeLabel = string.IsNullOrEmpty(mirrorData.StringData)
? string.Empty
: mirrorData.StringData.Split('(')[0];
}
return viewModel;
}
/// <summary>
/// Obtain the condensed preview values for this control. Must not be called from
/// Scheduler thread or this could cause a live-lock.
/// </summary>
/// <param name="refreshDisplay">The action to refresh the UI</param>
private void RefreshCondensedDisplay(Action refreshDisplay)
{
// The preview control will not have its content refreshed unless
// the content is null. In order to perform real refresh, new data
// source needs to be rebound to the preview control by calling
// BindToDataSource method.
//
if (cachedSmallContent != null)
{
// If there are cached contents, simply update the UI and return
if (refreshDisplay != null)
{
refreshDisplay();
}
return;
}
CompactBubbleViewModel newContent = null;
RunOnSchedulerSync(
() =>
{
var mirrorData = nodeViewModel.NodeModel.CachedValue;
newContent = CompactBubbleHandler.Process(mirrorData);
},
(m) =>
{
cachedSmallContent = newContent;
var smallContentView = smallContentGrid.Children[0] as PreviewCompactView;
smallContentView.DataContext = cachedSmallContent;
if (refreshDisplay != null)
{
refreshDisplay();
}
}
);
}
/// <summary>
/// Bind a mirror data to the preview control for display, this call
/// unbinds the internal data structure from the view that it was
/// originally bound to and resets the data structure. If this call is
/// made while the preview control is in condensed or expanded state,
/// the display will immediately be refreshed. Since this method deals
/// with UI elements internally, it must be called from the UI thread.
/// </summary>
internal void BindToDataSource()
{
// First detach the bound data from its view.
ResetContentViews();
// Reset expanded content.
cachedLargeContent = null;
// Reset condensed content.
cachedSmallContent = null;
// If at the time of data binding the preview control is within the
// following states, then its contents need to be updated immediately.
if (IsCondensed)
{
RefreshCondensedDisplay(null);
}
else if (IsExpanded)
{
RefreshExpandedDisplay(RefreshExpandedDisplayAction);
}
IsDataBound = true;
}
