/// <summary>
/// Delete graphic object from layer.
/// </summary>
/// <param name="data">Data object to delete.</param>
/// <param name="layer">Graphics layer from which to delete.</param>
public static void DeleteObject(object data, GraphicsLayer layer)
{
for (int index = layer.Graphics.Count - 1; index >= 0; index--)
{
DataGraphicObject graphic = (DataGraphicObject)layer.Graphics[index];
if (graphic.Data == data)
{
layer.Graphics.Remove(graphic);
DataGraphicObject dataGraphicObject = graphic as DataGraphicObject;
if (dataGraphicObject != null)
{
dataGraphicObject.UnsubscribeOnChange();
}
break;
}
}
}
/// <summary>
/// React on collection changed.
/// </summary>
/// <param name="sender">Ignored.</param>
/// <param name="e">Event args.</param>
private void _CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
switch (e.Action)
{
case NotifyCollectionChangedAction.Add:
{
System.Diagnostics.Debug.Assert(e.NewItems.Count > 0);
foreach (object data in e.NewItems)
{
// If graphic for this item was already created (to show not yet committed item)
// - do not create it again.
if (FindGraphicByData(data) == null)
{
Graphic graphic = CreateGraphic(data, _dataType, _graphicObjectType, LayerContext);
if (graphic != null)
{
DataGraphicObject dataGraphicObject = graphic as DataGraphicObject;
if (dataGraphicObject != null && _layerContext != null)
{
dataGraphicObject.ObjectContext = _layerContext;
}
_layer.Graphics.Add(graphic);
}
}
}
break;
}
case NotifyCollectionChangedAction.Remove:
{
System.Diagnostics.Debug.Assert(e.OldItems.Count > 0);
foreach (object data in e.OldItems)
{
DeleteObject(data, _layer);
_graphicDictionary.Remove(data);
}
break;
}
case NotifyCollectionChangedAction.Reset:
{
foreach (Graphic graphic in _layer.Graphics)
{
DataGraphicObject dataGraphicObject = graphic as DataGraphicObject;
if (dataGraphicObject != null)
{
dataGraphicObject.UnsubscribeOnChange();
}
}
_graphicDictionary.Clear();
_layer.Graphics.Clear();
break;
}
default:
throw new NotSupportedException();
}
}
