Angular 2のRenderer

Angular 2のRenderer
おのうえ (@_likr)
ng-kyoto Angular Meetup #4

自己紹介
• おのうえ (@_likr)
• 京都大学政策のための科学ユニット特定助教 🆕
• ng-kyoto オーガナイザー 
GDG神戸スタッフ
• 可視化アプリケーションの 
Webベース実装

Renderer
• https://angular.io/docs/ts/latest/api/core/Renderer-class.html
• WHAT IT DOES
• Not yet documented
• HOW TO USE
• Not yet documented

はじめに
• Angular 2のRendererで遊んでみる
• 明日使えなくなっても泣かない

Rendererの概要
• RootRenderer
• Rendererを返す
• Renderer
• レンダリングする
• DomRenderer (default)
• WorkerRenderer
• DebugDomRenderer
• RootRendererをDIする

RendererのInterface
• selectRootElement
• createElement
• createViewRoot
• createTemplateAnchor
• createText
• projectNodes
• attachViewAfter
• detachView
• destroyView
• listen
• listenGlobal
• setElementProperty
• setElementAttribute
• setBindingDebugInfo
• setElementClass
• setElementStyle
• invokeElementMethod
• setText
https://angular.io/docs/ts/latest/api/core/Renderer-class.html

簡単なRendererを作る
import {Injectable} from 'angular2/core';
import {
Renderer,
RootRenderer,
RenderComponentType,
RenderDebugInfo
} from 'angular2/src/core/render/api';
@Injectable()
export class MyRootRenderer implements RootRenderer {
renderComponent(componentProto: RenderComponentType): Renderer {
return new MyRenderer();
}
}
class MyRenderer implements Renderer {
selectRootElement(selectorOrNode: string | any, debugInfo: RenderDebugInfo) : any {
console.log('selectRootElement', selectorOrNode, debugInfo);
return {};
}
createElement(parentElement: any, name: string, debugInfo: RenderDebugInfo) : any {
console.log('createElement', parentElement, name, debugInfo);
return {};
}
// …
}
my-renderer.ts

自作Rendererを使う
import {Component} from 'angular2/core';
@Component({
selector: 'my-app',
template: '<h1>My First Angular 2 App</h1>'
})
export class AppComponent { }
import {provide, RootRenderer} from 'angular2/core';
import {bootstrap} from 'angular2/platform/browser';
import {AppComponent} from './app.component';
import {MyRootRenderer} from './my-renderer'
bootstrap(AppComponent, [
provide(RootRenderer, { useClass: MyRootRenderer }),
]);
app.component.ts
main.ts

動かす
https://plnkr.co/edit/ifMaZknans8yAAA8sSAV

もしかして
• Angularで3Dグラフィックスができるのでは！？
• Scene Graph
• 宣言的に3Dオブジェクトを作成
• Change Detectionの恩恵
• イベントハンドリングの抽象化

THREE.jsベースのRenderer
import {Injectable} from 'angular2/core';
import {
Renderer,
RootRenderer,
RenderComponentType,
RenderDebugInfo
} from 'angular2/src/core/render/api';
@Injectable()
export class MyRootRenderer implements RootRenderer {
scene: THREE.Scene; camera: THREE.Camera; renderer: THREE.WebGLRenderer;
constructor() {
this.scene = new THREE.Scene();
this.camera = new THREE.PerspectiveCamera(75, 1, 0.1, 1000);
this.camera.position.z = 5;
this.renderer = new THREE.WebGLRenderer();
}
renderComponent(componentProto: RenderComponentType): Renderer {
return new MyRenderer(this);
}
}

THREE.jsベースのRenderer
class MyRenderer implements Renderer {
constructor(private rootRenderer: MyRootRenderer) {
}
selectRootElement(selector: string, debugInfo: RenderDebugInfo) : any {
var element = document.querySelector(selector);
this.rootRenderer.renderer.setSize(600, 600);
element.innerHTML = ''; element.appendChild(this.rootRenderer.renderer.domElement);
var render = () => {
requestAnimationFrame(render);
this.rootRenderer.renderer.render(this.rootRenderer.scene, this.rootRenderer.camera);
};
render();
return this.rootRenderer.scene;
}
createElement(parentElement: any, name: string, debugInfo: RenderDebugInfo) : any {
switch (name) {
case 'three-box':
var geometry = new THREE.BoxGeometry(1, 1, 1);
var material = new THREE.MeshBasicMaterial();
var cube = new THREE.Mesh(geometry, material);
this.rootRenderer.scene.add(cube);
return cube;
// …
default:
throw 'unknown element';
}
}
setElementAttribute(renderElement: any, attributeName: string, attributeValue: string) : void {
switch (attributeName) {
case 'color':
renderElement.material.color = new THREE.Color(attributeValue);
break;
// …
}
}
}

描画してみる
https://plnkr.co/edit/yB0J8nVBK0KUiwkFO1VC
import {Component} from "angular2/core"
@Component({
selector: 'my-app',
template: '<three-box></three-box>',
})
export class AppComponent {
}

描画してみる
https://plnkr.co/edit/yB0J8nVBK0KUiwkFO1VC

Data Bindingできる
https://plnkr.co/edit/H4D1gmksKC0LH5AKHA3i
import {Component} from "angular2/core"
@Component({
selector: 'my-app',
template: `
<three-box
[attr.color]="boxColor">
</three-box>
`,
})
export class AppComponent {
boxColor = 'rgb(0, 255, 0)';
}

Data Bindingできる
https://plnkr.co/edit/H4D1gmksKC0LH5AKHA3i

import {Component, OnInit} from "angular2/core"
@Component({
selector: 'my-app',
template: `
<three-box [attr.color]="boxColor"
[attr.rotationX]="rotationX" [attr.rotationY]="rotationY">
</three-box>
`,
})
export class AppComponent implements OnInit {
boxColor = 'rgb(0, 255, 0)';
rotationX = 0; rotationY = 0;
ngOnInit() {
this.updateRotation();
}
updateRotation() {
this.rotationX += 0.1; this.rotationY += 0.1;
requestAnimationFrame(() => this.updateRotation());
}
}
ChangeDetectionが効く
https://plnkr.co/edit/EbqstFqCrsyVkZqLSWfY

ChangeDetectionが効く
https://plnkr.co/edit/EbqstFqCrsyVkZqLSWfY

ngForも使える
https://plnkr.co/edit/SAxskSugUVmBWFFcﬁMC
@Component({
selector: 'my-app',
template: `
<three-box *ngFor="let box of boxes"
[attr.color]="box.color" [attr.positionX]="box.x"
[attr.rotationX]="rotationX" [attr.rotationY]="rotationY">
</three-box>
`,
})
export class AppComponent implements OnInit {
boxes = [
{color: 'rgb(255, 0, 0)', x: -3},
{color: 'rgb(0, 255, 0)', x: 0},
{color: 'rgb(0, 0, 255)', x: 3},
];
ngOnInit() {
}
updateRotation() {
}
}

ngForも使える
https://plnkr.co/edit/SAxskSugUVmBWFFcﬁMC

こんなことやる
APIじゃないと思う

まとめ
• Renderer APIでHTMLのレンダリングをカスタマイズ
• One Framework
• Angular 2は、Component指向で構築された 
XMLっぽい文書を解釈して 
UIっぽい何かを開発するフレームワーク！？
• 多分違う
• ご利用は計画的に

Angular 2のRenderer

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