lastFocusedIdInFrameSince

Pass result from lastFocusedIdInFrame. Returns the id of a widget that was focused between the two calls, if any.

If so, this means one of:

a widget had focus when it called WidgetData.register
focusWidget with the id of the last widget to call WidgetData.register
focusWidget with the id of a widget in the parent chain

If return is non null, can pass to eventMatch .focus_id to match key events the focused widget got but didn't handle.

Only valid between Window.beginand Window.end.

Parameters

prev:Id: Id

Source

Implementation

pub fn lastFocusedIdInFrameSince(prev: Id) ?Id {
    const last_focused_id = lastFocusedIdInFrame();
    if (prev != last_focused_id) {
        return last_focused_id;
    } else {
        return null;
    }
}