use-real-combo-box

Arguments: combo-box-column-mixin

This combo-box-column-mixin option has been deprecated. The default value of nil should always be used. Setting this option to true can lead to problems with some combinations of other options, and so this option should not have been provided. On the Windows platform, this option tells a Microsoft combo-box widget to show its drop-down pane even though the combo-box itself is hidden, which the OS does not expect. On the GTK platforms, this option has never had an effect at all.

Returns true or nil to indicate whether the argument, which must be an instance of grid-column and of the mixin class combo-box-column-mixin, uses a standard combo-box control to show its drop-down list of choices, rather than using whatever simulation of a combo-box control is used by default (the default is nil).

This provides a choice for alternative styles for grid-widget combo-box cells, and an application may use whichever one is more suitable for it. This property may be set either by calling the setf of this function or by passing the :use-real-combo-box initarg to make-instance.

In the current Windows implementation, the default value of nil causes a pop-up menu to be used. The menu will always be as wide as needed in order to display the complete string for each choice. A value of true causes a Windows combo-box to be used instead. The combo-box will always be just as wide as the grid-column is, and therefore may clip some of the choice strings. The combo-box may be closed by pressing alt-uparrow, as with a standalone combo-box control. Alt-downarrow may be used to open either type, as an alternative to pressing either the spacebar or the return key. The two styles have different borders.

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This page was not revised from the 10.0 page.
Created 2019.8.20.