Method startWatching

src/views/managers/DeviceManager.ts:32–52

* 开始监听屏幕尺寸变化

(element: HTMLElement)

     * 开始监听屏幕尺寸变化
     */
    startWatching(element: HTMLElement): void {
        this.observedElement = element;
        this.updateDeviceInfo();

        // 使用 ResizeObserver 监听元素尺寸变化
        this.resizeObserver = new ResizeObserver(() => {
            const oldIsMobile = this.isMobileView;
            const oldIsSmallScreen = this.isSmallScreen;
            
            this.updateDeviceInfo();
            
            // 如果设备信息发生变化，触发回调
            if (oldIsMobile !== this.isMobileView || oldIsSmallScreen !== this.isSmallScreen) {
                if (this.onDeviceChangeCallback) {
                    this.onDeviceChangeCallback(this.getDeviceInfo());
                }
            }
        });
        
        this.resizeObserver.observe(element);
    }

    /**
     * 停止监听