140.HarmonyOS NEXT系列教程之3D立方体旋转轮播案例讲解之DataChangeListener接口

interface DataChangeListener {
    onDataReloaded(): void;
    onDataAdd(index: number): void;
    onDataChange(index: number): void;
    onDataDelete(index: number): void;
    onDataMove(from: number, to: number): void;
}

onDataReloaded(): void;

onDataAdd(index: number): void;

onDataChange(index: number): void;

class MyListener implements DataChangeListener {
    onDataReloaded(): void {
        console.log('Data reloaded');
    }

    onDataAdd(index: number): void {
        console.log(`Data added at ${index}`);
    }

    onDataChange(index: number): void {
        console.log(`Data changed at ${index}`);
    }

    onDataDelete(index: number): void {
        console.log(`Data deleted at ${index}`);
    }

    onDataMove(from: number, to: number): void {
        console.log(`Data moved from ${from} to ${to}`);
    }
}

class AdvancedListener implements DataChangeListener {
    private updateUI: () => void;

    constructor(updateCallback: () => void) {
        this.updateUI = updateCallback;
    }

    onDataReloaded(): void {
        console.log('Reloading data...');
        this.updateUI();
    }

    onDataAdd(index: number): void {
        console.log(`Adding data at ${index}`);
        this.updateUI();
    }

    // ... 其他方法实现
}

class UIComponent {
    private listener: DataChangeListener;

    constructor() {
        this.listener = new MyListener();
        dataSource.registerDataChangeListener(this.listener);
    }

    private updateUI(): void {
        // 更新UI逻辑
    }
}

class DataSyncListener implements DataChangeListener {
    onDataChange(index: number): void {
        // 同步到服务器
        this.syncToServer(index);
    }

    private syncToServer(index: number): void {
        // 同步实现
    }
}