Method activate

docs/app/js/sanddance-app.js:10545–10549

(datum)

        this.isCollapsed = collapsed;
    }
    activate(datum) {
        this.deactivate();
        datum[(0, _sanddanceSpecs.FieldNames).Active] = true;
        this.active = datum;
    }
    deactivate() {
        if (this.active) delete this.active[(0, _sanddanceSpecs.FieldNames).Active];
        this.active = null;