/// <summary>
/// Implements the RemoveItemInternal from the parent class.
/// Will take the object and remove the target item from the Map.Layers collection
/// </summary>
/// <param name="obj">Object to be removed</param>
protected override void RemoveItemInternal(DependencyObject obj)
{
bool mappingContainsObject;
mappingContainsObject = this.ObjectToMapLayerMapping.ContainsKey(obj);
Debug.Assert(mappingContainsObject, "It is expected that there is a mapping for the object");
if (mappingContainsObject)
{
MapLayer mapLayer;
mapLayer = this.ObjectToMapLayerMapping[obj];
this.ObjectToMapLayerMapping.Remove(obj);
this.Map.Layers.Remove(mapLayer);
if (!(obj is MapItemsControl))
{
Debug.Assert(mapLayer.Count == 1, "Expected that the map overlay once created is still there");
}
// Clear the bindings in the map overlays.
foreach (MapOverlay mapOverlay in mapLayer)
{
MapChild.ClearMapOverlayBindings(mapOverlay);
}
}
}
/// <summary>
/// Takes the target object and create the corresponding MapLayer that will be used
/// to host in MapOverlays all the items provided.
/// </summary>
/// <param name="obj">Object from the source collection to be processed</param>
/// <returns>The MapLayer that will be used to host the items from the source</returns>
/// <remarks>
/// It only supports two types of objects 1) MapItemsControl or 2) anything else.
/// For MapItemsControls, the creation of the MapOverlays will be deferred to the MapItemsControl
/// </remarks>
private static MapLayer GetMapLayerForObject(object obj)
{
MapLayer mapLayer;
MapItemsControl mapItemsControl;
// Only to types of objects supported per se.
// 1) MapItemsControl
// 2) Everything else
mapItemsControl = obj as MapItemsControl;
if (mapItemsControl != null)
{
// MapsItemsControl does their own control of creation of MapOverlays
// because by the time we are here, items may be there already.
// For that reason, we only bring the MapLayer an add it.
mapLayer = mapItemsControl.MapLayer;
Debug.Assert(mapLayer.Count == mapItemsControl.Items.Count, "MapLayer and MapItemsControl.Items count should match");
}
else
{
// Only 1 element. Create MapOverlay and insert
mapLayer = new MapLayer();
MapOverlay mapOverlay;
mapOverlay = MapChild.CreateMapOverlay(obj, null);
mapLayer.Add(mapOverlay);
}
return(mapLayer);
}
/// <summary>
/// Resets the target collection and internal state
/// </summary>
protected override void ResetInternal()
{
foreach (MapOverlay mapOverlay in this.MapLayer)
{
MapChild.ClearMapOverlayBindings(mapOverlay);
}
this.MapLayer.Clear();
this.ObjectToMapOverlayMapping.Clear();
}
/// <summary>
/// Inserts the item at the specified index in the target collection
/// </summary>
/// <param name="index">Index at which object will be inserted</param>
/// <param name="obj">Object to be inserted</param>
protected override void InsertItemInternal(int index, object obj)
{
MapOverlay mapOverlay;
if (this.ObjectToMapOverlayMapping.ContainsKey(obj))
{
throw new InvalidOperationException("Attempted to insert the same object twice");
}
mapOverlay = MapChild.CreateMapOverlay(obj, this.ItemTemplate);
this.MapLayer.Insert(index, mapOverlay);
this.ObjectToMapOverlayMapping.Add(obj, mapOverlay);
}
/// <summary>
/// Implements the behavior the target collection will have when the source is reset
/// </summary>
protected override void ResetInternal()
{
// The source collection has changed drastically enough.
// Clear all the MapOverlay bindings.
foreach (MapLayer mapLayer in this.Map.Layers)
{
foreach (MapOverlay mapOverlay in mapLayer)
{
MapChild.ClearMapOverlayBindings(mapOverlay);
}
}
this.Map.Layers.Clear();
this.ObjectToMapLayerMapping.Clear();
}
/// <summary>
/// Remove the specified item from the target collection
/// </summary>
/// <param name="obj">Object to be removed</param>
protected override void RemoveItemInternal(object obj)
{
bool mappingContainsObject;
mappingContainsObject = this.ObjectToMapOverlayMapping.ContainsKey(obj);
Debug.Assert(mappingContainsObject, "expected to have a mapping for the object");
if (mappingContainsObject)
{
MapOverlay mapOverlay;
mapOverlay = this.ObjectToMapOverlayMapping[obj];
this.ObjectToMapOverlayMapping.Remove(obj);
this.MapLayer.Remove(mapOverlay);
MapChild.ClearMapOverlayBindings(mapOverlay);
}
}
/// <summary>
/// Will handle the item template change
/// </summary>
/// <param name="d">DependencyObject that triggers the event.</param>
/// <param name="e">Event args</param>
private static void OnItemTemplateChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
MapItemsControl mapsItemControl;
DataTemplate dataTemplate;
mapsItemControl = (MapItemsControl)d;
dataTemplate = (DataTemplate)e.NewValue;
mapsItemControl.ItemsChangeManager.ItemTemplate = dataTemplate;
foreach (MapOverlay mapOverlay in mapsItemControl.MapLayer)
{
// New template, so there will be a new ui element created
MapChild.ClearMapOverlayBindings(mapOverlay);
MapOverlayItem mapOverlayPresenterHelper = (MapOverlayItem)mapOverlay.Content;
mapOverlayPresenterHelper.ContentTemplate = dataTemplate;
}
}
/// <summary>
/// OnApplyTemplate override.
/// Will take care of binding the dependency properties.
/// </summary>
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
MapChild.BindMapOverlayProperties(this.MapOverlay);
}