protected override Size MeasureOverride(Size availableSize)
{
Size desiredSize = new Size();
UIElementCollection children = InternalChildren;
IItemContainerGenerator generator = ItemContainerGenerator;
int itemsCount = 0;
if (generator != null)
{
int StartItemIndex = navigationPane.GetFirstItemIndex(DisplayType);
if (StartItemIndex > -1)
{
int maxItems = DisplayType == NavigationPaneItemDisplayType.Large ? navigationPane.LargeItems : int.MaxValue;
GeneratorPosition startPos = new GeneratorPosition(-1, StartItemIndex + 1);
using (generator.StartAt(startPos, GeneratorDirection.Forward, true))
{
bool sizeExceeded = false;
bool newlyRealized;
UIElement child = null;
// temp fix for {Disconnected Item}
// needs more inspecting and documentation to fix it correctly !!
// but this for now seems to work... strange items present ??
// remove them, NOW !!!!!
//for (int j = children.Count - 1; j > -1; j--)
//{
//UIElement item = children[j];
//object o = navigationPane.ItemContainerGenerator.ItemFromContainer(item);
//if (o == DependencyProperty.UnsetValue)
// RemoveInternalChild(item);
//}
while (!sizeExceeded && (itemsCount < maxItems) && (child = generator.GenerateNext(out newlyRealized) as UIElement) != null)
{
bool isExcluded = NavigationPane.GetIsItemExcluded(child);
if (!isExcluded)
{
if (newlyRealized || !children.Contains(child))
{
int absoluteIndex = StartItemIndex + itemsCount;
int index = GetInsertIndex(absoluteIndex);
if (absoluteIndex < 9 && navigationPane.ItemsKeyAuto)
{
NavigationPaneItem f = child as NavigationPaneItem;
{
Window w = Window.GetWindow(child);
if (w != null)
{
KeyBinding binding = f.keyBinding;
if (binding != null)
{
w.InputBindings.Remove(binding);
}
f.keyBinding = new KeyBinding(NavigationPane.SelectItemCommand, Key.D1 + absoluteIndex, navigationPane.ItemsKeyModifiers);
f.keyBinding.CommandParameter = child;
f.keyBinding.CommandTarget = navigationPane;
w.InputBindings.Add(f.keyBinding);
if (f != null)
{
f.Gesture = (f.keyBinding.Gesture as KeyGesture).GetDisplayStringForCulture(CultureInfo.CurrentCulture);
}
}
}
}
SetActivePanel(child, this);
SetAbosluteIndex(child, absoluteIndex);
SetItemDisplayType(child, DisplayType);
if (newlyRealized)
{
generator.PrepareItemContainer(child);
}
InsertInternalChild(index, child);
}
#region measurament algoritm
Size childSize = new Size();
if (Orientation == Orientation.Vertical)
{
childSize = new Size(availableSize.Width, double.PositiveInfinity);
}
else
{
childSize = new Size(double.PositiveInfinity, availableSize.Height);
}
child.Measure(childSize);
if (Orientation == Orientation.Vertical)
{
sizeExceeded = desiredSize.Height + child.DesiredSize.Height > availableSize.Height;
if (!sizeExceeded)
{
desiredSize.Width = Math.Max(desiredSize.Width, child.DesiredSize.Width);
desiredSize.Height += child.DesiredSize.Height;
}
}
else
{
sizeExceeded = desiredSize.Width + child.DesiredSize.Width > availableSize.Width;
if (!sizeExceeded)
{
desiredSize.Width += child.DesiredSize.Width;
desiredSize.Height = Math.Max(desiredSize.Height, child.DesiredSize.Height);
}
}
#endregion
if (!sizeExceeded)
{
itemsCount++;
}
}
else
{
RemoveInternalChild(child);
}
}
}
CleanUpItems(StartItemIndex, itemsCount);
}
}
if (DisplayType == NavigationPaneItemDisplayType.Small)
{
navigationPane.SmallItems = itemsCount;
}
return(desiredSize);
}
