border-width

Arguments: grid-object

Returns the width in pixels, if one has been specified, with which to draw a border along the right side of a grid-column or grid-column-section, or along the bottom of a grid-row or grid-row-section, or around an entire grid-widget. The setf of this function may be called to change the width, at which time the grid will be drawn as needed to display the new border width.

The value may be either a non-negative integer or nil. The initial value is nil. When nil, effective-border-width will find a width to use in some other way. Zero means to draw no border at all (though cell-3d-border may still be used to draw a separate 3d border).

An exception to the above rule is that if the object is a grid-widget then nil is not a valid value, the initial value is 3, and effective-border-width is not called.

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Created 2012.5.30.