center-all

Arguments: lamp

Returns the value of the center-all property of a lamp widget. The value may be be specified at creation time with the center-all initarg, or anytime later by calling (setf center-all).

If the center-all property is nil, as it is by default, then the lamp images are positioned by the outer margin properties from the edge of the widget on any sides of the lamp image where there are no labels, leaving the rest of the widget's area for the labels. That may be useful for aligning the lamp images of multiple widgets by simply aligning the widgets themselves, without making sure that the widgets are all the same size. If the center-all property is true, then the lamp images and labels are centered as a unit within the widget's area. That may be especially useful when the lamp is used in a grid-widget cell, to keep the widget centered as the grid-widget cell changes in size. (When there are no label strings, the lamp images are always centered.)

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Created 2010.1.21.