如何在Angular4(TypeScript)中集成zimJS？求技术支持

Hey there, I totally feel your pain—hunting for Angular/TypeScript support for a library you need only to come up empty (especially when alternatives like CreateJS have clear paths) is super frustrating. Since there's no official ZIM.js adapter for Angular right now, let's walk through some practical, tested workarounds to get it up and running in your project:

Step 1: Add ZIM.js to Your Project Manually #

Since there's no official npm package with TypeScript typings, you'll need to pull in the ZIM.js script directly. Two easy ways to do this:

• Download the minified ZIM.js file from its official source and place it in your src/assets folder, then reference it in your index.html
• Add the CDN links directly to your index.html (make sure to use the latest version available):

  <script src="https://zimjs.org/cdn/1.3.2/createjs.js"></script>
  <script src="https://zimjs.org/cdn/10.8.2/zim.js"></script>
  

Step 2: Declare ZIM Types for TypeScript #

TypeScript throws errors when it encounters unrecognized globals, so we need to define a basic typings file to let it know about ZIM. Here's how:

1. Create a new folder src/typings and add a file named zim.d.ts inside it
2. Add this basic declaration (you can expand it with specific types as you use more ZIM features):

   declare var ZIM: any;
   declare var zim: any;
   
   // Example of expanding with specific types (optional):
   // interface ZIMFrame {
   //   constructor(width: number, height: number, bgColor: string, borderColor: string, title: string): void;
   //   stage: any;
   //   on(event: string, callback: () => void): void;
   // }
   // declare var Frame: ZIMFrame;
   

3. Update your tsconfig.json to include the typings folder so TypeScript picks it up:

   "include": [
     "src/**/*",
     "src/typings/**/*"
   ]
   

Step 3: Wrap ZIM in an Angular Service (For Better Encapsulation) #

Keeping your ZIM logic centralized in an Angular service makes it reusable across components and easier to manage. Here's a starter service example:

import { Injectable, OnInit, NgZone } from '@angular/core';

@Injectable({ providedIn: 'root' })
export class ZimService implements OnInit {
  private zimFrame: any;

  constructor(private ngZone: NgZone) {}

  ngOnInit() {
    // Initialize ZIM Frame when the service loads
    this.zimFrame = new ZIM.Frame(800, 600, "#333", "#666", "ZIM in Angular");
    this.zimFrame.on("ready", () => {
      const stage = this.zimFrame.stage;
      // Example: Add a basic ZIM element
      const circle = new ZIM.Circle(50, "royalblue").center(stage);
      stage.update();
    });
  }

  // Expose the stage for components to use
  getStage() {
    return this.zimFrame?.stage;
  }
}

You can then inject this service into any component where you need to use ZIM.

Step 4: Handle Angular's Change Detection #

Angular's change detection can sometimes interfere with ZIM's rendering loop. To fix this, run your ZIM animation code outside Angular's zone:

// Inside your component or service, when adding animations:
this.ngZone.runOutsideAngular(() => {
  setInterval(() => {
    circle.rotation += 1;
    stage.update();
  }, 20);
});

Pro tip: As you use more ZIM features, expand the typings file with specific interfaces to get better TypeScript autocompletion. If you build a robust wrapper, consider sharing it with the ZIM community—it would help a lot of developers facing the same issue!

内容的提问来源于stack exchange，提问作者Anastas.R