private void SetupPlaceHolder()
{
string sizeString = (string)(VirtualizedContainerService.GetHintSize(this.modelItem.GetCurrentValue()));
Size? size = null;
if (!string.IsNullOrEmpty(sizeString))
{
size = Size.Parse(sizeString);
}
if (size == null)
{
size = defaultContainerSize;
}
this.MinWidth = size.Value.Width;
this.MinHeight = size.Value.Height;
}
public VirtualizingContainer(VirtualizedContainerService containerService, ModelItem modelItem, ICompositeView sourceContainer)
{
this.containerService = containerService;
this.modelItem = modelItem;
this.sourceContainer = sourceContainer;
this.Focusable = false;
this.BorderThickness = new Thickness(1);
SetupPlaceHolder();
this.children = new List <VirtualizingContainer>();
this.Unloaded += (sender, args) =>
{
this.containerService.tree.Remove(this);
this.oldBounds = new Rect(0, 0, 0, 0);
UnRegisterFromParentContainer();
};
this.Loaded += (sender, args) =>
{
RegisterWithParentContainer();
};
}
public VirtualizingContainer(VirtualizedContainerService containerService, ModelItem modelItem, ICompositeView sourceContainer)
{
this.containerService = containerService;
this.modelItem = modelItem;
this.sourceContainer = sourceContainer;
this.Focusable = false;
this.BorderThickness = new Thickness(1);
SetupPlaceHolder();
this.children = new List<VirtualizingContainer>();
this.Unloaded += (sender, args) =>
{
this.containerService.tree.Remove(this);
this.oldBounds = new Rect(0, 0, 0, 0);
UnRegisterFromParentContainer();
};
this.Loaded += (sender, args) =>
{
RegisterWithParentContainer();
};
}
private void AddToQuadTree()
{
try
{
Point currentPoint = GetPosition();
if (this.ActualHeight > 0 && this.ActualWidth > 0)
{
Rect bounds = new Rect(currentPoint, new Size(this.ActualWidth, this.ActualHeight));
Rect viewerBounds = this.containerService.GetViewerBounds();
bool isInView = viewerBounds.IntersectsWith(bounds) || viewerBounds.Contains(bounds) || bounds.Contains(viewerBounds);
if (isInView)
{
this.Populate();
currentPoint = GetPosition();
bounds = new Rect(currentPoint, new Size(this.ActualWidth, this.ActualHeight));
}
else
{
// a previous Arrange could have led to adding this to the quadtree already.
// so remove previos instances from quadtree.
if (!this.isPopulated)
{
if (this.BorderBrush != SystemColors.GrayTextBrush)
{
this.BorderBrush = SystemColors.GrayTextBrush;
}
}
}
if (this.oldBounds != bounds)
{
this.containerService.tree.Remove(this);
this.containerService.tree.Insert(this, bounds);
if (this.oldBounds != Rect.Empty)
{
this.Dispatcher.BeginInvoke(DispatcherPriority.Render, (Action)(() =>
{
foreach (VirtualizingContainer childContainer in this.children)
{
// if there were designers registered under the old bounds let them re-register
childContainer.AddToQuadTree();
}
}));
}
this.oldBounds = bounds;
}
if (this.IsPopulated)
{
VirtualizedContainerService.SetHintSize(this.modelItem.GetCurrentValue(), bounds.Size.ToString(CultureInfo.InvariantCulture));
}
}
}
catch (InvalidOperationException)
{
// This can happen if an arrange happened within the child of the container, when not in the visual tree
// for the current breadcrumb root. The GetTransform will throw invalidoperation in this case.
this.containerService.tree.Remove(this);
}
}
