protected virtual void RebuildMarkers(bool shouldReleaseMarkers)
{
if (markerGenerator == null)
{
return;
}
if (shouldReleaseMarkers)
{
foreach (FrameworkElement item in itemsPanel.Children)
{
var enumerator = item.GetLocalValueEnumerator();
while (enumerator.MoveNext())
{
item.ClearValue(enumerator.Current.Property);
}
descriptor.RemoveValueChanged(item, OnMarkerViewportBoundsChanged);
markerGenerator.ReleaseMarker(item);
}
}
itemsPanel.Children.Clear();
if (dataSource == null)
{
return;
}
IndividualArrangePanel specialPanel = itemsPanel as IndividualArrangePanel;
if (specialPanel != null)
{
specialPanel.BeginBatchAdd();
}
foreach (object item in dataSource)
{
var marker = CreateMarker(item);
itemsPanel.Children.Add(marker);
}
if (specialPanel != null)
{
specialPanel.EndBatchAdd();
}
RecalculateViewportBounds();
}
protected virtual void DrawAllMarkers(bool reuseExisting, bool continueAfterDataPrepaired)
{
if (!IsReadyToDrawMarkers())
{
return;
}
var dataSource = DataSource;
dataSource.Environment = new DataSourceEnvironment {
Plotter = this.Plotter, FirstDraw = true
};
if (!continueAfterDataPrepaired)
{
dataSource.PrepairData(getDataAsyncronously);
if (getDataAsyncronously)
{
LongOperationsIndicator.BeginLongOperation(this);
return;
}
}
CurrentItemsPanel.Children.Clear();
BuildCommonBindings();
startIndex = 0;
lastIndex = startIndex;
IndividualArrangePanel panel = CurrentItemsPanel as IndividualArrangePanel;
if (panel != null)
{
panel.BeginBatchAdd();
}
ViewportHostPanel viewportPanel = CurrentItemsPanel as ViewportHostPanel;
if (viewportPanel != null)
{
viewportPanel.OverallViewportBounds = DataRect.Empty;
}
foreach (var dataItem in dataSource.GetData())
{
CreateAndAddMarker(dataItem, lastIndex);
lastIndex++;
if (showMarkersConsequently && lastIndex % 100 == 0)
{
// make dispatcher execute all operations in its queue;
// so that markers will appear on the screen step-by-step,
// making application more responsive.
// This line is dangerous, it causes WI 1677
// Dispatcher.Invoke(() => { }, DispatcherPriority.Background);
}
}
if (panel != null)
{
panel.EndBatchAdd();
}
int len = CurrentItemsPanel.Children.Count;
if (lastIndex < len)
{
for (int i = lastIndex; i < len; i++)
{
UIElement element = CurrentItemsPanel.Children[i];
element.Visibility = Visibility.Collapsed;
}
}
LongOperationsIndicator.EndLongOperation(this);
}