/// <summary>
/// Dequeues an UIElement from the specified renderer.
/// </summary>
/// <param name="renderer">
/// Specifies the corresponding renderer to dequeue the UIElement
/// </param>
/// <returns>
/// Returns the UIelement.
/// </returns>
public T Dequeue(GridCellRendererBase renderer)
{
if (!ContainsKey(renderer))
{
return(default(T));
}
Queue <WeakReference> queue = base[renderer];
if (queue.Count == 0)
{
return(default(T));
}
var el = queue.Dequeue().Target as T;
if (el == null)
{
return(default(T));
}
el.Visibility = Visibility.Visible;
return(el);
}
/// <summary>
/// Gets the <see cref="System.Collections.Generic.Queue{WeakReference}"/> for the specified Renderer.
/// </summary>
/// <value></value>
public new Queue <WeakReference> this[GridCellRendererBase renderer]
{
get
{
if (ContainsKey(renderer))
{
return(base[renderer]);
}
Queue <WeakReference> queue = base[renderer] = new Queue <WeakReference>();
return(queue);
}
}
/// <summary>
/// Cheks whether the Render Dictionary contains the corresponding renderer.
/// </summary>
/// <param name="cellRenderer"></param>
/// <returns></returns>
/// <remarks></remarks>
public bool ContainsValue(GridCellRendererBase cellRenderer)
{
return(this.content.ContainsValue(cellRenderer));
}
/// <summary>
/// Enqueues the UI element to the specified renderer.
/// </summary>
/// <param name="renderer">
/// The corresponding renderer to enqueue the UIElement in it.
/// </param>
/// <param name="uiElement">
/// The corresponding UIElement to perform enqueue operation.
/// </param>
public void Enqueue(GridCellRendererBase renderer, T uiElement)
{
this[renderer].Enqueue(new WeakReference(uiElement));
uiElement.Visibility = Visibility.Collapsed;
}