/// <summary>
/// Override for preparing the container.
/// </summary>
/// <param name="element">The element dependency object.</param>
/// <param name="item">The item object.</param>
protected override void PrepareContainerForItemOverride(DependencyObject element, object item)
{
base.PrepareContainerForItemOverride(element, item);
ContentPresenter container = element as ContentPresenter;
this.containersByItem.Add(item, container);
DependencyObject dependencyObject = item as DependencyObject;
if (dependencyObject != null)
{
CascadingListBoxGroup.SetCascadingListBoxGroup(dependencyObject, this);
LinkingWrapPanel.SetIsLinkedToNextChild(container, LinkingWrapPanel.GetIsLinkedToNextChild(dependencyObject));
this.UpdateListVisibility(dependencyObject);
}
#if SILVERLIGHT
Canvas.SetZIndex(container, this.Items.Count - this.Items.IndexOf(item));
#endif
ISplitItemsControl splitItemsControl = item as ISplitItemsControl;
if (splitItemsControl == null)
{
FrameworkElement frameworkElement = item as FrameworkElement;
if (frameworkElement != null && !string.IsNullOrEmpty(CascadingListBoxGroup.GetCascadingListBoxName(frameworkElement)))
{
splitItemsControl = frameworkElement.FindName(CascadingListBoxGroup.GetCascadingListBoxName(frameworkElement)) as ISplitItemsControl;
}
}
if (splitItemsControl != null)
{
CascadingListBoxGroup.SetCascadingListBoxGroup(splitItemsControl as DependencyObject, this);
this.containersBySplitItemsControl.Add(splitItemsControl, container);
}
}
/// <summary>
/// The main layout algorithm for measure and arrange.
/// </summary>
/// <param name="arrange">Whether to arrange the children.</param>
/// <param name="availableSize">The available size.</param>
/// <returns>The final size.</returns>
private Size MeasureArrangeChildren(bool arrange, Size availableSize)
{
double currentChildWidth = 0;
double tallestChildHeight = 0;
double currentX = 0;
double currentY = 0;
double width = 0;
List <UIElement> linkedChildren = new List <UIElement>();
UIElement previousChild = null;
foreach (UIElement child in this.Children)
{
if (previousChild != null && !LinkingWrapPanel.GetIsLinkedToNextChild(previousChild))
{
foreach (UIElement linkedChild in linkedChildren)
{
double childWidth = linkedChild.DesiredSize.Width;
if (LinkingWrapPanel.GetCanResize(linkedChild) && childWidth > availableSize.Width && currentX == 0)
{
childWidth = availableSize.Width;
}
if (arrange)
{
linkedChild.Arrange(new Rect(currentX, currentY, childWidth, linkedChild.DesiredSize.Height));
}
currentX += childWidth;
if (currentX > width)
{
width = currentX;
}
if (tallestChildHeight < linkedChild.DesiredSize.Height)
{
tallestChildHeight = linkedChild.DesiredSize.Height;
}
}
currentChildWidth = 0;
linkedChildren.Clear();
}
if (!arrange)
{
child.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
}
double childwidth = child.DesiredSize.Width;
currentChildWidth += childwidth;
if (currentX != 0.0 && currentX + currentChildWidth > availableSize.Width)
{
currentX = 0;
currentY += tallestChildHeight;
tallestChildHeight = 0;
}
if (LinkingWrapPanel.GetCanResize(child) && childwidth > availableSize.Width && currentX == 0)
{
currentChildWidth -= childwidth;
childwidth = availableSize.Width;
if (!arrange)
{
child.Measure(new Size(childwidth, double.PositiveInfinity));
}
currentChildWidth += childwidth;
}
if (previousChild != null && !LinkingWrapPanel.GetIsLinkedToNextChild(previousChild) && !LinkingWrapPanel.GetIsLinkedToNextChild(child))
{
if (arrange)
{
child.Arrange(new Rect(currentX, currentY, childwidth, child.DesiredSize.Height));
}
currentX += childwidth;
if (currentX > width)
{
width = currentX;
}
currentChildWidth = 0;
if (tallestChildHeight < child.DesiredSize.Height)
{
tallestChildHeight = child.DesiredSize.Height;
}
}
else
{
linkedChildren.Add(child);
}
previousChild = child;
}
foreach (UIElement linkedChild in linkedChildren)
{
double childWidth = linkedChild.DesiredSize.Width;
if (LinkingWrapPanel.GetCanResize(linkedChild) && childWidth > availableSize.Width && currentX == 0)
{
childWidth = availableSize.Width;
}
if (arrange)
{
linkedChild.Arrange(new Rect(currentX, currentY, childWidth, linkedChild.DesiredSize.Height));
}
currentX += childWidth;
if (currentX > width)
{
width = currentX;
}
if (tallestChildHeight < linkedChild.DesiredSize.Height)
{
tallestChildHeight = linkedChild.DesiredSize.Height;
}
}
return(new Size(
this.HorizontalAlignment == HorizontalAlignment.Stretch ? (!double.IsPositiveInfinity(availableSize.Width) ? availableSize.Width : width) : width,
this.VerticalAlignment == VerticalAlignment.Stretch ? (!double.IsPositiveInfinity(availableSize.Height) ? availableSize.Height : currentY + tallestChildHeight) : currentY + tallestChildHeight));
}