is-child-allowed

Arguments: window

Returns true if the specified window is allowed to have child windows.

If is-child-allowed returns nil for a window foo, and a second window bar is created with the foo specified as its parent, then bar becomes an owned window of foo rather than a child window.

This feature is used by the IDE's development-main-window to force all windows created on it to be owned. In addition, the default parent of a window created in the IDE is the development-main-window. Because of these two facts, a window created in the IDE with no parent specified becomes an owned window of the IDE's invisible development-main-window.

An application could add an is-child-allowed method for a class of window that is intended to always be an owner window rather than a parent.

See About child, parent, and owner windows in cgide.htm.

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This page was not revised from the 9.0 page.
Created 2015.5.21.