Method getComponent

src/model/Global.ts:572–587

* @param idx If not specified, return the first one.

(mainType: ComponentMainType, idx?: number)

     * @param idx If not specified, return the first one.
     */
    getComponent(mainType: ComponentMainType, idx?: number): ComponentModel {
        const list = this._componentsMap.get(mainType);
        if (list) {
            const cmpt = list[idx || 0];
            if (cmpt) {
                return cmpt;
            }
            else if (idx == null) {
                for (let i = 0; i < list.length; i++) {
                    if (list[i]) {
                        return list[i];
                    }
                }
            }
        }
    }

    /**
     * @return Never be null/undefined.