image-list-open-p

Arguments: image-list

This function returns true if and only if the argument image-list is currently open. Currently Common Graphics uses image-lists only for list-view controls, which automatically open their image-lists when needed, so this function is not likely to be needed by applications.

Note that if a list-view control that does not have the share-image-lists property turned on is removed from its dialog or the dialog is closed, then the operating system will destroy any image lists that were used by the list-view control. An application can call image-list-open-p to determine whether this has happened. On the other hand, close-image-list is not called when the OS destroys an image-list, and so an application cannot check for this occurrence by wrapping close-image-list, and should call image-list-open-p instead.

See list-view.

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