internal void ClearItemContainer(object item, ItemsControl parentItemsControl)
{
if (VirtualizingPanel.GetIsVirtualizing(parentItemsControl))
{
//
// ItemValueStorage: save off values for this container if we're a virtualizing TreeView.
//
//
// Right now we have a hard-coded list of DPs we want to save off. In the future we could provide a 'register' API
// so that each ItemsControl could decide what DPs to save on its containers. Maybe we define a virtual method to
// retrieve a list of DPs the type is interested in. Alternatively we could have the contract
// be that ItemsControls use the ItemStorageService inside their ClearContainerForItemOverride by calling into StoreItemValues.
//
Helper.StoreItemValues(parentItemsControl, this, item);
// Tell the panel to clear off all its containers. This will cause this method to be called
// recursively down the tree, allowing all descendent data to be stored before we save off
// the ItemValueStorage DP for this container.
VirtualizingPanel vp = ItemsHost as VirtualizingPanel;
if (vp != null)
{
vp.OnClearChildrenInternal();
}
ItemContainerGenerator.RemoveAllInternal(true /*saveRecycleQueue*/);
}
// this container is going away - forget about its selection
ContainsSelection = false;
}
// Token: 0x0600592F RID: 22831 RVA: 0x0018A4C1 File Offset: 0x001886C1
internal void PrepareItemContainer(object item, ItemsControl parentItemsControl)
{
Helper.ClearVirtualizingElement(this);
TreeViewItem.IsVirtualizingPropagationHelper(parentItemsControl, this);
if (VirtualizingPanel.GetIsVirtualizing(parentItemsControl))
{
Helper.SetItemValuesOnContainer(parentItemsControl, this, item);
}
}
// Token: 0x06005930 RID: 22832 RVA: 0x0018A4E0 File Offset: 0x001886E0
internal void ClearItemContainer(object item, ItemsControl parentItemsControl)
{
if (VirtualizingPanel.GetIsVirtualizing(parentItemsControl))
{
Helper.StoreItemValues(parentItemsControl, this, item);
VirtualizingPanel virtualizingPanel = base.ItemsHost as VirtualizingPanel;
if (virtualizingPanel != null)
{
virtualizingPanel.OnClearChildrenInternal();
}
base.ItemContainerGenerator.RemoveAllInternal(true);
}
this.ContainsSelection = false;
}
internal void PrepareItemContainer(object item, ItemsControl parentItemsControl)
{
//
// Clear previously cached items sizes
//
Helper.ClearVirtualizingElement((IHierarchicalVirtualizationAndScrollInfo)this);
IsVirtualizingPropagationHelper(parentItemsControl, this);
//
// ItemValueStorage: restore saved values for this item onto the new container
//
if (VirtualizingPanel.GetIsVirtualizing(parentItemsControl))
{
Helper.SetItemValuesOnContainer(parentItemsControl, this, item);
}
}
// Token: 0x06004E08 RID: 19976 RVA: 0x0015FBB4 File Offset: 0x0015DDB4
private static void OnExpanded(object sender, RoutedEventArgs e)
{
GroupItem groupItem = sender as GroupItem;
if (groupItem != null && groupItem._expander != null && groupItem._expander.IsExpanded)
{
ItemsControl parentItemsControl = groupItem.ParentItemsControl;
if (parentItemsControl != null && VirtualizingPanel.GetIsVirtualizing(parentItemsControl) && VirtualizingPanel.GetVirtualizationMode(parentItemsControl) == VirtualizationMode.Recycling)
{
ItemsPresenter itemsHostPresenter = groupItem.ItemsHostPresenter;
if (itemsHostPresenter != null)
{
groupItem.InvalidateMeasure();
Helper.InvalidateMeasureOnPath(itemsHostPresenter, groupItem, false);
}
}
}
}
private static void OnExpanded(object sender, RoutedEventArgs e)
{
GroupItem groupItem = sender as GroupItem;
if (groupItem != null && groupItem._expander != null && groupItem._expander.IsExpanded)
{
ItemsControl itemsControl = groupItem.ParentItemsControl;
if (itemsControl != null && VirtualizingPanel.GetIsVirtualizing(itemsControl) && VirtualizingPanel.GetVirtualizationMode(itemsControl) == VirtualizationMode.Recycling)
{
ItemsPresenter itemsHostPresenter = groupItem.ItemsHostPresenter;
if (itemsHostPresenter != null)
{
// In case a GroupItem that wasn't previously expanded is now
// recycled to represent an entity that is expanded, we face a situation
// where the ItemsHost isn't connected yet but we do need to synchronously
// remeasure the sub tree through the ItemsPresenter leading up to the
// ItemsHost panel. If we didnt do this the offsets could get skewed.
groupItem.InvalidateMeasure();
Helper.InvalidateMeasureOnPath(itemsHostPresenter, groupItem, false /*duringMeasure*/);
}
}
}
}
// Token: 0x06005A23 RID: 23075 RVA: 0x0018D664 File Offset: 0x0018B864
private static object CoerceIsVirtualizingWhenGrouping(DependencyObject d, object baseValue)
{
bool isVirtualizing = VirtualizingPanel.GetIsVirtualizing(d);
return(isVirtualizing && (bool)baseValue);
}
