protected override void OnBeginDrag()
{
if (this.DraggedElements.Count > MoveStrategy.GetMaxChildrenForElement((SceneElement)this.LayoutContainer, (IProperty)null))
{
throw new InvalidOperationException(ExceptionStringTable.BehaviorCannotHandleMultipleElements);
}
this.PrepareDraggedElementsForDragging();
}
protected override void UpdateInsertionPoint()
{
IViewPanel viewPanel = MoveStrategy.GetContainerHost((SceneElement)this.LayoutContainer) as IViewPanel;
this.ClearAdorner();
this.InsertionPoint.Element = this.LayoutContainer;
bool isCursorAtEnd = true;
this.InsertionPoint.Index = FlowPanelLayoutUtilities.GetInsertionIndex((SceneElement)this.LayoutContainer, this.ActiveView.TransformPoint((IViewObject)this.ActiveView.HitTestRoot, this.LayoutContainer.Visual, this.DragCurrentPosition), out isCursorAtEnd);
this.InsertionPoint.IsCursorAtEnd = isCursorAtEnd;
this.AdornerSet = (AdornerSet) new FlowPanelInsertionPointAdornerSet(this.ToolContext, this.LayoutContainer, (FlowPanelInsertionPoint)this.InsertionPoint);
this.ActiveView.AdornerLayer.Add((IAdornerSet)this.AdornerSet);
}
private static MoveStrategy CreateForLayoutMode(MoveStrategyContext context, SceneElement hitElement)
{
SceneElement sceneElement = hitElement;
while (sceneElement != null)
{
BaseFrameworkElement frameworkElement = sceneElement as BaseFrameworkElement;
if (frameworkElement != null && context.RootNode.IsAncestorOf((SceneNode)frameworkElement))
{
if (!MoveStrategyFactory.CanMoveInside(context, frameworkElement))
{
sceneElement = frameworkElement.ParentElement;
continue;
}
MoveStrategy byParentType = MoveStrategyFactory.CreateByParentType(context, frameworkElement);
if (byParentType != null)
{
bool flag = false;
ItemsControlElement itemsControlElement = frameworkElement.ParentElement as ItemsControlElement;
ContentControlElement contentControlElement = frameworkElement as ContentControlElement;
if (itemsControlElement != null && contentControlElement != null && (ItemsControlElement.ItemsProperty.Equals((object)itemsControlElement.GetPropertyForChild((SceneNode)frameworkElement)) && (itemsControlElement.ViewObject as IViewItemsControl).IsItemItsOwnContainer(contentControlElement.ViewObject)))
{
flag = true;
}
if (!flag)
{
IProperty contentProperty = MoveStrategyFactory.GetContentProperty(context, (SceneNode)frameworkElement);
int childrenForElement = MoveStrategy.GetMaxChildrenForElement((SceneElement)frameworkElement, contentProperty);
if (context.DraggedElements.Count <= childrenForElement && (childrenForElement != 1 || context.DraggedElements.Count != 1 || (!frameworkElement.IsAncestorOf((SceneNode)context.DraggedElements[0]) || context.DraggedElements[0].Parent == frameworkElement)))
{
byParentType.LayoutContainer = frameworkElement;
return(byParentType);
}
}
}
}
if (sceneElement != context.RootNode)
{
sceneElement = sceneElement.ParentElement;
}
else
{
break;
}
}
return((MoveStrategy)null);
}
public static MoveStrategy Create(MoveStrategyContext context, SceneElement hitElement, bool constraining)
{
MoveStrategy moveStrategy = (MoveStrategy)null;
if (context.IsRecordingKeyframes)
{
moveStrategy = MoveStrategyFactory.CreateForAnimationMode(context);
}
if (moveStrategy == null)
{
moveStrategy = MoveStrategyFactory.CreateForLayoutMode(context, hitElement);
}
if (moveStrategy != null)
{
moveStrategy.IsConstraining = constraining;
}
return(moveStrategy);
}
private static MoveStrategy CreateByParentType(MoveStrategyContext context, BaseFrameworkElement parentContainer)
{
MoveStrategyFactory.MoveStrategyTypeHandlerFactory orCreateCache = DesignSurfacePlatformCaches.GetOrCreateCache <MoveStrategyFactory.MoveStrategyTypeHandlerFactory>(parentContainer.Platform.Metadata, DesignSurfacePlatformCaches.MoveStrategyFactoryCache);
ItemsControlElement itemsControlElement = parentContainer as ItemsControlElement;
TextBlockElement textBlockElement = parentContainer as TextBlockElement;
Type type = (Type)null;
if (itemsControlElement != null && itemsControlElement.ItemsHost != null)
{
type = orCreateCache.GetHandlerType((ITypeResolver)itemsControlElement.ProjectContext, itemsControlElement.ItemsHost.GetIType((ITypeResolver)parentContainer.ProjectContext), true);
}
if (type == (Type)null)
{
type = orCreateCache.GetHandlerType((ITypeResolver)parentContainer.ProjectContext, parentContainer.Type, false);
}
if (type == typeof(GenericMoveStrategy))
{
ILayoutDesigner designerForParent = parentContainer.ViewModel.GetLayoutDesignerForParent((SceneElement)parentContainer, true);
if ((designerForParent.GetWidthConstraintMode(parentContainer, (BaseFrameworkElement)null) & LayoutConstraintMode.CanvasLike) == LayoutConstraintMode.NonOverlappingGridlike && (designerForParent.GetHeightConstraintMode(parentContainer, (BaseFrameworkElement)null) & LayoutConstraintMode.CanvasLike) == LayoutConstraintMode.NonOverlappingGridlike)
{
type = typeof(LayoutMoveStrategy);
}
}
if (textBlockElement != null && !parentContainer.ViewModel.ProjectContext.IsCapabilitySet(PlatformCapability.SupportsTextBlockInlineUIContainer))
{
type = (Type)null;
}
if (!(type != (Type)null))
{
return((MoveStrategy)null);
}
MoveStrategy moveStrategy = (MoveStrategy)Activator.CreateInstance(type, new object[1]
{
(object)context
});
moveStrategy.LayoutContainer = parentContainer;
return(moveStrategy);
}
protected override void UpdateInsertionPoint()
{
this.ClearAdorner();
this.InsertionPoint.Element = this.LayoutContainer;
ITextFlowSceneNode textFlowSceneNode = this.InsertionPoint.Element as ITextFlowSceneNode;
Point mousePosition = this.InsertionPoint.Element.ViewModel.DefaultView.GetMousePosition(this.Pointer, MoveStrategy.GetContainerHost((SceneElement)this.InsertionPoint.Element));
IViewTextPointer positionFromPoint = textFlowSceneNode.GetPositionFromPoint(mousePosition);
IViewTextPointer position = positionFromPoint != null?positionFromPoint.GetInsertionPosition(LogicalDirection.Forward) : textFlowSceneNode.ContentEnd.GetNextInsertionPosition(LogicalDirection.Backward);
this.InsertionPoint.IsCursorAtEnd = false;
if (textFlowSceneNode.ContentStart == null)
{
this.InsertionPoint.IsCursorAtEnd = true;
}
else
{
this.InsertionPoint.Index = textFlowSceneNode.ContentStart.GetOffsetToPosition(position);
this.AdornerSet = (AdornerSet) new TextFlowInsertionPointAdornerSet(this.ToolContext, this.LayoutContainer, (TextFlowInsertionPoint)this.InsertionPoint);
this.ActiveView.AdornerLayer.Add((IAdornerSet)this.AdornerSet);
}
}
