Method center

packages/fairygui/src/core/GObject.ts:210–219

* Center this object in its parent * 在父容器中居中

(bRestraint: boolean = false)

     * 在父容器中居中
     */
    public center(bRestraint: boolean = false): void {
        const r = this._parent || this.root;
        if (r) {
            this.setXY((r.width - this.width) / 2, (r.height - this.height) / 2);
            if (bRestraint) {
                this.addRelation(r, ERelationType.CenterCenter);
                this.addRelation(r, ERelationType.MiddleMiddle);
            }
        }
    }

    // Size | 尺寸