/// <summary>
/// Successively copy the properties from the <paramref name="sourcePanel"/> to the <paramref name="targetPanel"/>, then swap the panels in the parent
/// and finally move the children from the <paramref name="sourcePanel"/> to the <paramref name="targetPanel"/>.
/// </summary>
private void CopySwapExchange([NotNull] PanelViewModel sourcePanel, [NotNull] UIElementDesign targetPanel,
[CanBeNull] Func <IEnumerable <UIElementViewModel>, IEnumerable <UIElementViewModel> > childSorter = null)
{
var targetPanelElement = targetPanel.UIElement as Panel;
if (targetPanelElement == null)
{
throw new ArgumentException(@"The target element must be a Panel", nameof(targetPanel));
}
// Clone common properties
CopyCommonProperties(Editor.NodeContainer, sourcePanel.AssetSidePanel, targetPanelElement);
// Initialize the new hierarchy of elements that starts from the target and contains all the children
IEnumerable <UIElementViewModel> children = sourcePanel.Children.ToList();
var hierarchy = UIAssetPropertyGraph.CloneSubHierarchies(Asset.Session.AssetNodeContainer, Asset.Asset, children.Select(c => c.Id.ObjectId), SubHierarchyCloneFlags.None, out _);
hierarchy.RootParts.Add(targetPanel.UIElement);
hierarchy.Parts.Add(targetPanel);
// Remove all children from the source panel.
foreach (var child in children)
{
Asset.AssetHierarchyPropertyGraph.RemovePartFromAsset(child.UIElementDesign);
}
// Swap panels in the parent
var elementParent = Parent as UIElementViewModel;
var rootParent = Parent as UIRootViewModel;
if (rootParent != null)
{
// special case of RootElement
rootParent.ReplaceRootElement(sourcePanel, hierarchy, targetPanelElement.Id);
}
else if (elementParent != null)
{
// Remove current panel from Parent
var index = elementParent.Children.IndexOf(sourcePanel);
Asset.AssetHierarchyPropertyGraph.RemovePartFromAsset(sourcePanel.UIElementDesign);
Asset.AssetHierarchyPropertyGraph.AddPartToAsset(hierarchy.Parts, targetPanel, elementParent.AssetSideUIElement, index);
}
else
{
throw new InvalidOperationException();
}
// Sort the children list before re-inserting them in the target panel.
children = childSorter?.Invoke(children) ?? children;
// Then populate the target panel
foreach (var child in children)
{
Asset.InsertUIElement(hierarchy.Parts, hierarchy.Parts[child.Id.ObjectId], targetPanelElement);
}
}
public abstract void ReplaceRootElement([NotNull] PanelViewModel sourcePanel, [NotNull] AssetCompositeHierarchyData <UIElementDesign, UIElement> hierarchy, Guid targetPanelId);