public static int GetInsertionIndex(SceneElement container, Point position, out bool isCursorAtEnd)
{
isCursorAtEnd = false;
IViewPanel viewPanel = MoveStrategy.GetContainerHost(container) as IViewPanel;
if (viewPanel == null)
{
return(0);
}
Orientation orientation = viewPanel.Orientation;
if (viewPanel.ChildrenCount == 0)
{
return(0);
}
bool flag = PlatformTypes.StackPanel.IsAssignableFrom((ITypeId)container.Type) || PlatformTypes.VirtualizingStackPanel.IsAssignableFrom((ITypeId)container.Type);
ActualBoundsInParent actualBoundsInParent = new ActualBoundsInParent(container);
foreach (FlowPanelLayoutUtilities.LineInfo line in FlowPanelLayoutUtilities.ExtractLines(container))
{
if (flag || FlowPanelLayoutUtilities.IsPointInLine(position, line, orientation))
{
if (line.StartElementIndex == line.EndElementIndex)
{
IViewVisual child = viewPanel.GetChild(line.StartElementIndex);
Rect elementLayoutBounds = actualBoundsInParent[child];
if (FlowPanelLayoutUtilities.DoesPointLieBeforeElement(position, elementLayoutBounds, orientation))
{
isCursorAtEnd = false;
return(line.StartElementIndex);
}
isCursorAtEnd = true;
return(line.StartElementIndex + 1);
}
IViewVisual child1 = viewPanel.GetChild(line.StartElementIndex);
IViewVisual child2 = viewPanel.GetChild(line.EndElementIndex);
Rect elementLayoutBounds1 = actualBoundsInParent[child1];
Rect elementLayoutBounds2 = actualBoundsInParent[child2];
if (FlowPanelLayoutUtilities.DoesPointLieBeforeElement(position, elementLayoutBounds1, orientation))
{
isCursorAtEnd = false;
return(line.StartElementIndex);
}
if (FlowPanelLayoutUtilities.DoesPointLieAfterElement(position, elementLayoutBounds2, orientation))
{
isCursorAtEnd = true;
return(line.EndElementIndex + 1);
}
for (int startElementIndex = line.StartElementIndex; startElementIndex < line.EndElementIndex; ++startElementIndex)
{
IViewVisual child3 = viewPanel.GetChild(startElementIndex);
IViewVisual child4 = viewPanel.GetChild(startElementIndex + 1);
Rect currentElementLayoutBounds = actualBoundsInParent[child3];
Rect nextElementLayoutBounds = actualBoundsInParent[child4];
if (FlowPanelLayoutUtilities.DoesPointLieBetweenElements(position, currentElementLayoutBounds, nextElementLayoutBounds, orientation))
{
return(startElementIndex + 1);
}
}
break;
}
}
if (flag)
{
return(-1);
}
isCursorAtEnd = true;
return(viewPanel.ChildrenCount);
}
