/// <summary>
/// Registeres a handler for the UI element type defined by it 'Type' property
/// </summary>
/// <remarks>
/// If a handler was registered before for the exact same type (e.g. one of the default handlers),
/// it is removed and replaced by the handler given
/// </remarks>
public static void RegisterDragDropUITargetHandler(IDragDropUiTargetHandler handler)
{
if (DragDrop.dragTargetHandlers.ContainsKey(handler.Type))
{
DragDrop.dragTargetHandlers.Remove(handler.Type);
}
DragDrop.dragTargetHandlers.Add(handler.Type, handler);
}
/// <summary>
/// Notifies the handler, that a drag operation has started above the control
/// </summary>
/// <param name="effect"></param>
public void NotifyDragStarted(DragDropEffect effect)
{
TabPanel TabPanel = this.element.GetVisualDescendantsDepthFirst <TabPanel>().FirstOrDefault();
if (TabPanel != null)
{
IDragDropUiTargetHandler Handler = DragDrop.GetDragDropUITargetHandler(TabPanel.GetType());
if (Handler != null)
{
this.panelTargetHandler = Handler.Create(TabPanel, this.adapter, false);
}
}
if (this.panelTargetHandler == null)
{
this.panelTargetHandler = new DummyUiHandler();
}
this.panelTargetHandler.NotifyDragStarted(effect);
}
/// <summary>
/// Notifies the handler, that a drag operation has started above the control
/// </summary>
/// <param name="effect"></param>
public void NotifyDragStarted(DragDropEffect effect)
{
ItemsPresenter ItemsPresenter = this.element.GetVisualDescendantsDepthFirst <ItemsPresenter>().FirstOrDefault();
if (ItemsPresenter != null)
{
Panel ItemsPanel = VisualTreeHelper.GetChild(ItemsPresenter, 0) as Panel;
if (ItemsPanel != null)
{
IDragDropUiTargetHandler Handler = DragDrop.GetDragDropUITargetHandler(ItemsPanel.GetType());
if (Handler != null)
{
this.panelTargetHandler = Handler.Create(ItemsPanel, this.adapter, false);
}
}
}
if (this.panelTargetHandler == null)
{
this.panelTargetHandler = new DummyUiHandler();
}
this.panelTargetHandler.NotifyDragStarted(effect);
}
