cell-font

Arguments: grid-row grid-column

This generic function is called whenever a grid-widget cell is drawn, to determine the font that will be current when draw-cell is called for the cell. A font should be returned to be used for the cell that lies at the intersection of the specified row and column. An application may add cell-font methods to determine the current font for various cells. Call make-font-ex or make-font to make the font to return.

The default method calls the font-reader function of the grid-column on the data-object of the grid-row if both of those properties have been supplied by the application, and otherwise returns the font property of the column if it is non-nil, and otherwise returns the font property of the whole grid-widget.

While a custom draw-cell method could simply call with-font to establish the font on the fly, defining cell-font methods may be needed when built-in draw-cell methods are used. For example, a default grid cell will draw a centered string from the value returned by read-cell-value, without the application supplying a custom draw-cell method. And when using the grid-column mixin classes that supply built-in grid cell widgets, such as editable-text-column-mixin and combo-box-column-mixin, built-in draw-cell methods are always used, and so a custom cell-font method can control the font of the otherwise built-in drawing behavior of those cells.

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This page was not revised from the 8.1 page.
Created 2010.1.21.