Method constructor

src/view/params-view.ts:101–127

(param: Param, constrainedBy?: ParamRow, nullable = false)

  constrainedBy?: ParamRow;

  constructor(param: Param, constrainedBy?: ParamRow, nullable = false) {
    if (!param.selections)
      throw new Error('Property "selections" expected.');
    super(param, gui.Picker.create(), nullable);

    this.selections = param.selections instanceof Function ? param.selections() : param.selections;

    // Listen to controlling param's change and update.
    if (constrainedBy) {
      this.constrainedBy = constrainedBy;
      constrainedBy.affects.push(this);
      constrainedBy.subscribeOnChange(() => {
        this.update();
        // Iterate all params constrained by this.
        this.affects.forEach(p => p.update());
      });
    }
    // There is a description field in selection.
    if (this.selections.length > 0 &&
        typeof this.selections[0].value == 'object' &&
        'description' in this.selections[0].value) {
      this.createDescription();
      this.subscribeOnChange(() => this.#updateDescription());
    }
    // Fill the picker with selections.
    this.update();
  }

  update() {
    let selections = this.selections;