DesignerThumb CreateThumb(PlacementAlignment alignment, Cursor cursor)
{
DesignerThumb designerThumb = new ResizeThumb( cursor == Cursors.SizeNS, cursor == Cursors.SizeWE );
designerThumb.Cursor = cursor;
designerThumb.Alignment = alignment;
AdornerPanel.SetPlacement(designerThumb, Place(ref designerThumb, alignment));
adornerPanel.Children.Add(designerThumb);
DragListener drag = new DragListener(designerThumb);
drag.Started += new DragHandler(drag_Started);
drag.Changed += new DragHandler(drag_Changed);
drag.Completed += new DragHandler(drag_Completed);
return designerThumb;
}
/// <summary>
/// Places resize thumbs at their respective positions
/// and streches out thumbs which are at the center of outline to extend resizability across the whole outline
/// </summary>
/// <param name="resizeThumb"></param>
/// <param name="alignment"></param>
/// <returns></returns>
private RelativePlacement Place(ref ResizeThumb resizeThumb,PlacementAlignment alignment)
{
RelativePlacement placement = new RelativePlacement(alignment.Horizontal,alignment.Vertical);
if (alignment.Horizontal == HorizontalAlignment.Center)
{
placement.WidthRelativeToContentWidth = 1;
placement.HeightOffset = 6;
resizeThumb.Opacity = 0;
return placement;
}
if (alignment.Vertical == VerticalAlignment.Center)
{
placement.HeightRelativeToContentHeight = 1;
placement.WidthOffset = 6;
resizeThumb.Opacity = 0;
return placement;
}
placement.WidthOffset = 6;
placement.HeightOffset = 6;
return placement;
}