public interface EdgeSizes defaultSize will map to the default edge size or offset for the canvas (Canvas.edgeSize, or Canvas.edgeOffset and top, left, right and bottom will map to the edgeTop/edgeOffsetTop, edgeLeft/edgeOffsetLeft, edgeRight/edgeOffsetRight, and edgeBottom/edgeOffsetBottom attributes on the paneContainer respectively. Note that not all these properties have to be set - if unset standard edge sizing rules will apply.