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Allegro CL version 10.1
Unrevised from 10.0 to 10.1.
10.0 version


Arguments: configuration

Returns (or sets with setf) the value of the center-all-modal-dialogs-on-screen configuration property.

This property affects modal dialogs displayed by utility functions such as ask-user-for-choice-from-list. Modal dialogs created by application code can be positioned wherever the application likes before they are shown. But applications do not have a handle on built-in modal dialogs and so cannot specify their positions directly. This property gives some measure of control over the placement of such dialogs.

If the typical conventions allowed by this configuration option are not adequate, the built-in utility dialogs can be positioned however you like by writing a position-utility-dialog method.

The value of this property of the current configuration can be t, nil, or :on-owner, which is the default.

If the value is :on-owner, the dialog is centered on the owner window that the application passes to the various utility dialog functions. Such modal dialogs are displayed by functions like ask-user-for-choice-from-list.

If the value is t (or, indeed, any true value other than :on-owner), modal dialogs are positioned in the center of the screen (absent overriding specification of another location). If the value is nil, modal dialogs are placed near the upper left corner of the owner.

Note that for Common Dialogs (implemented by the operating system and invoked by functions such as ask-user-for-new-pathname), Common Graphics does not know how large the dialogs are and therefore cannot center them; therefore, for Common Dialogs, the :on-owner option behaves like nil to position the dialogs at or near the upper left corner of the owner window.

The current configuration is the value of (configuration *system*). (See configuration and *system*.)

See also position-utility-dialog

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

Allegro CL version 10.1
Unrevised from 10.0 to 10.1.
10.0 version