Wednesday, 29 July 2009

User Control Snap Lines in Visual Studio (Part 2)

The earlier code does indeed only work when the contained label is at position (0,0). Here is a fix that offsets the position of the snap lines based on the label position.
public override IList SnapLines
{
get
{
if (labelDesigner == null)
{
return base.SnapLines;
}
return labelDesigner.SnapLines.Cast<SnapLine>().Select(sn => BuildSnapLine(sn)).ToList();
}
}

private SnapLine BuildSnapLine(SnapLine source)
{
return new SnapLine(source.SnapLineType, BuildOffset(source.Offset, source.IsHorizontal),
source.Filter, source.Priority);
}

private int BuildOffset(int offset, bool isHorizontal)
{
return offset + (isHorizontal ? labelDesigner.Control.Top : labelDesigner.Control.Left);
}

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