/// <summary>
/// Discover the preferred size of the element.
/// </summary>
/// <param name="context">Layout context.</param>
public override Size GetPreferredSize(ViewLayoutContext context)
{
// Sync child elements to the current group items
SyncChildrenToRibbonGroupItems();
// Clear down the cache of item sizes
_sizeList.Clear();
_viewList.Clear();
_viewToGap.Clear();
int totalWidth = 0;
ViewBase previousChild = null;
// Find the size of each individual visible child item
for (int i = 0; i < this.Count; i++)
{
ViewBase child = this[i];
// Only interested in visible items
if (child.Visible)
{
// Are we positioning a cluster?
if (child is ViewLayoutRibbonGroupCluster)
{
// Inform cluster if it is immediatley after another cluster (and so potentially needs a separator)
ViewLayoutRibbonGroupCluster clusterChild = (ViewLayoutRibbonGroupCluster)child;
clusterChild.StartSeparator = (previousChild != null) && !(previousChild is ViewLayoutRibbonGroupCluster);
clusterChild.EndSeparator = true;
}
// Can we calculate the spacing gap between the previous and this item
if (previousChild != null)
{
if (_viewToItem.ContainsKey(child) &&
_viewToItem.ContainsKey(previousChild))
{
// Cast to correct type
IRibbonGroupItem childItem = _viewToItem[child] as IRibbonGroupItem;
IRibbonGroupItem previousItem = _viewToItem[previousChild] as IRibbonGroupItem;
// Find the requested gap between them
_viewToGap.Add(child, childItem.ItemGap(previousItem));
}
else
{
// Default the gap
_viewToGap.Add(child, DEFAULT_GAP);
}
}
// Get requested size of the child
Size childSize = child.GetPreferredSize(context);
// Add to list of visible child sizes
_sizeList.Add(childSize);
_viewList.Add(child);
// Cache total visible width for later
totalWidth += childSize.Width;
// This is now the previous child
previousChild = child;
}
}
// Find the item size specific preferred calculation
switch (_currentSize)
{
case GroupItemSize.Large:
return(LargeMediumPreferredSize(totalWidth, ref _split1Large));
case GroupItemSize.Medium:
return(LargeMediumPreferredSize(totalWidth, ref _split1Medium));
case GroupItemSize.Small:
return(SmallPreferredSize(totalWidth));
default:
// Should never happen!
Debug.Assert(false);
return(Size.Empty);
}
}
protected virtual void AddSize(decimal p, int i, string n, ItemType t)
{
SizeList.Add(new Size(this, p, i, n, t));
}
protected virtual void AddSize(decimal p, int i, APizzaComponent apc)
{
SizeList.Add(new Size(this, p, i, apc));
}
protected virtual void AddSize(string type, decimal price)
{
SizeList.Add(new Size(type, price));
}