showActivateSignatureCard(action, showDelay) {
    let showDuration = 0.0;

    if (this._canShowSignatureCardNode && action instanceof SDK.ActivateSignatureCardAction) {
      // ensure signature card node is showing
      this._signatureCardNode.setVisible(true);

      // show activate of signature card
      showDuration = this._signatureCardNode.showActivate(showDelay);
    }

    return showDuration;
  }
Shows activation of a signature card for the player based on an action.
@param {SDK.Action} action
@param {Number} [showDelay=0.0]
@returns {Number} duration of animations