constructor (new expandable-snip%        [ [layout layout]         [closed-editor closed-editor]         [open-editor open-editor]         [callback callback]]         ...superclass-args...)

→ (is-a?/c expandable-snip%)

layout : (or/c 'append 'replace) = 'append

closed-editor : (is-a?/c text%) = (new text%)

open-editor : (is-a?/c text%) = (new text%)

callback : (-> boolean? any) = void

The callback is called when the snip state is toggled. It is called with a boolean that indicates whether the new state is open.

In closed mode, the toggle arrow and closed-editor are displayed adjacent on a single line. In open mode, the layout is controlled by the layout argument as follows:

• 'append — The first line is unchanged (that is, it contains both toggle arrow and closed-editor), and open-editor is displayed on the second line.

• 'replace — The toggle arrow and the open-editor are displayed on a single line. The closed-editor is not displayed.

method (send an-expandable-snip get-open-editor) → (is-a?/c text%)

Get the editor for the open mode.

method (send an-expandable-snip get-closed-editor) → (is-a?/c text%)

Gets the editor for the closed mode.