Angular2 ViewStack Demo

<!DOCTYPE html>
<html>

  <head>
    <base href="." />
    <title>angular2 playground</title>
    <link rel="stylesheet" href="style.css" />
    <script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script>
    <script src="https://unpkg.com/zone.js/dist/zone.js"></script>
    <script src="https://unpkg.com/zone.js/dist/long-stack-trace-zone.js"></script>
    <script src="https://unpkg.com/reflect-metadata@0.1.3/Reflect.js"></script>
    <script src="https://unpkg.com/systemjs@0.19.31/dist/system.js"></script>
    <script src="config.js"></script>
    <script>
    System.import('app')
      .catch(console.error.bind(console));
  </script>
  </head>

  <body>
    <my-app>
    loading...
  </my-app>
  </body>

</html>

/* Styles go here */

### Angular Starter Plunker - Typescript

System.config({
  //use typescript for compilation
  transpiler: 'typescript',
  //typescript compiler options
  typescriptOptions: {
    emitDecoratorMetadata: true
  },
  paths: {
    'npm:': 'https://unpkg.com/'
  },
  //map tells the System loader where to look for things
  map: {
    
    'app': './src',
    
    '@angular/core': 'npm:@angular/core/bundles/core.umd.js',
    '@angular/common': 'npm:@angular/common/bundles/common.umd.js',
    '@angular/compiler': 'npm:@angular/compiler/bundles/compiler.umd.js',
    '@angular/platform-browser': 'npm:@angular/platform-browser/bundles/platform-browser.umd.js',
    '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js',
    '@angular/http': 'npm:@angular/http/bundles/http.umd.js',
    '@angular/router': 'npm:@angular/router/bundles/router.umd.js',
    '@angular/forms': 'npm:@angular/forms/bundles/forms.umd.js',
    
    '@angular/core/testing': 'npm:@angular/core/bundles/core-testing.umd.js',
    '@angular/common/testing': 'npm:@angular/common/bundles/common-testing.umd.js',
    '@angular/compiler/testing': 'npm:@angular/compiler/bundles/compiler-testing.umd.js',
    '@angular/platform-browser/testing': 'npm:@angular/platform-browser/bundles/platform-browser-testing.umd.js',
    '@angular/platform-browser-dynamic/testing': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic-testing.umd.js',
    '@angular/http/testing': 'npm:@angular/http/bundles/http-testing.umd.js',
    '@angular/router/testing': 'npm:@angular/router/bundles/router-testing.umd.js',
    
    'rxjs': 'npm:rxjs',
    'typescript': 'npm:typescript@2.0.2/lib/typescript.js'
  },
  //packages defines our app package
  packages: {
    app: {
      main: './main.ts',
      defaultExtension: 'ts'
    },
    rxjs: {
      defaultExtension: 'js'
    }
  }
});

//main entry point
import {platformBrowserDynamic} from '@angular/platform-browser-dynamic';
import {AppModule} from './app';

platformBrowserDynamic().bootstrapModule(AppModule)

//our root app component
import {Component, NgModule,ViewChild, 
        Type, OnInit } from '@angular/core'
import {BrowserModule} from '@angular/platform-browser'
import { FormsModule } from '@angular/forms';
import { HttpModule } from '@angular/http';
import {CommonModule} from "@angular/common";

import {ViewStack} from "./app/viewstack/ViewStack";
import {ChildA} from "./app/viewstack/child/ChildA";
import {ChildB} from "./app/viewstack/child/ChildB";
import {ChildC} from "./app/viewstack/child/ChildC";


@Component({
  selector: 'my-app',
  template: `
    <button (click)="addChildA()">add childA</button>
    <button (click)="addChildB()">add childB</button>
    <button (click)="addChildC()">add childC</button>
    <select (change)="onSelectChange($event)" [ngModel]="vsMain.selectedIndex" >
      <option *ngFor="let view of children; let i = index;" [value]="i">{{i + ":" + view.constructor.name}}</option> 
    </select>
    
    <button (click)="removeChild()" [disabled]="vsMain.selectedIndex < 0" >remove</button>
    
    <view-stack #vsMain></view-stack>
  `,
})
export class App {
   @ViewChild('vsMain') private vsMain:ViewStack;

  private children:any[] = [];

  public constructor()
  {
    
  }
  
  public ngOnInit():void {
    this.addChildA();
    this.addChildB();
    this.addChildC();
  }

  private addChildA():void {
    this.addChild(ChildA);
  }

  private addChildB():void {
    this.addChild(ChildB);
  }

  private addChildC():void {
    this.addChild(ChildC);
  }

  private addChild<T>(child:Type<T>):void {
    this.vsMain.addChild(child);
    this.children = this.vsMain.children;
    this.vsMain.selectedIndex = this.vsMain.children.length - 1;
  }

  private onSelectChange($event:Event):void {

    let selectedIndexStr:string = (<HTMLSelectElement>event.target).value;
    this.vsMain.selectedIndex = +selectedIndexStr;
  }

  private removeChild():void {
    this.vsMain.removeChildAt(this.vsMain.selectedIndex);
    this.children = this.vsMain.children;
  }
}

@NgModule({
  declarations: [ 
    App,
    ViewStack,
    ChildA,
    ChildB,
    ChildC
  ],
  imports: [ 
    BrowserModule,
    FormsModule,
    HttpModule,
    CommonModule // ngClassとかつかうのに必要
  ],
  bootstrap: [ App ],
  // 動的に追加するコンポーネントはここに指定
  entryComponents: [ChildA, ChildB, ChildC] 
})
export class AppModule {}

import {
  Component, ComponentFactory, ComponentFactoryResolver, ViewContainerRef, Type,
  ComponentRef, ViewChild,  AfterViewInit
} from "@angular/core";

@Component({
  selector: 'view-stack',
  providers: [],
  template: `
    <div #container>
    </div>
  `
})

export class ViewStack implements AfterViewInit {

  private _children:ComponentRef<any>[] = [];
  private _selectedIndex:number = -1;

  @ViewChild('container', {read: ViewContainerRef}) private container:ViewContainerRef;

  public constructor(
    private _componentFactoryResolver: ComponentFactoryResolver
    //, private _viewContainerRef: ViewContainerRef
  )
  {

  }

  public ngAfterViewInit():void {
    //this._viewContainerRef.createEmbeddedView(this.container)
  }

  // interfaceか継承で縛ろうかとおもったけど、やめとく、、、
  // public addChild<T extends IViewStackContainer>(childClass: Type<T>, index:number=-1):void {
  public addChild<T>(childClass: Type<T>, index:number=-1):void {
    let debug = this.container;

    const componentFactory:ComponentFactory<T>
      = this._componentFactoryResolver.resolveComponentFactory(childClass);

    //const componentRef:ComponentRef<T> = this._viewContainerRef.createComponent(componentFactory);
    const componentRef:ComponentRef<T> = this.container.createComponent(componentFactory);

    if (index < 0) {
      this._children.push(componentRef);
    } else {
      this._children.splice(index, 0, componentRef);
    }
    if (this._children.length === 1) { // 初回追加時
      this._selectedIndex = 0;
      this.showComponent(this._selectedIndex, -1);
    } else {
      componentRef.location.nativeElement.setAttribute("hidden", true);
    }
  }

  private showComponent(showIndex:number, prevIndex:number):void {
    if (showIndex === prevIndex){ // 同じ場合は何もしない ここにくることは無いはず
      return;
    }
    if (0 <= prevIndex && prevIndex <= this._children.length - 1) {
      this._children[prevIndex].location.nativeElement.setAttribute("hidden", true);
    }
    this._children[showIndex].location.nativeElement.removeAttribute("hidden");
  }

  public removeChild<T>(child:Type<T>):void {
    for (let i=0; i<this._children.length; i++) {
      if (this._children[i].instance === child) {
        this.removeChildAt(i);
        break;
      }
    }
  }

  public removeChildAt(index:number) {
    this._children[index].destroy();
    this._children.splice(index, 1);
    if (this._children.length === 0) {
      this._selectedIndex = -1;
      return; // 表示するものが無くなったので何もしない
    }
    // 選択中の場合は削除されると後ろのやつが詰まってくるイメージなので
    if (index === this._selectedIndex) {
      if (index === this._children.length) { // 最後のやつ すでにspliceで減っているのでlength
        this.showComponent(this._children.length - 1, -1); // 最後尾が削除されたので１個前を表示
        this._selectedIndex = this._children.length - 1;
        return;
      }
      this.showComponent(index, -1); // 最後尾では無かったので次のやつを表示
      this._selectedIndex = index;
    }
  }

  public set selectedIndex(index:number) {
    this.showComponent(index, this._selectedIndex);
    this._selectedIndex = index;
  }

  public get selectedIndex():number {
    return this._selectedIndex;
  }

  public get selectedChild():any {
    if (this._selectedIndex < 0) {
      return null;
    }
    return this._children[this._selectedIndex].instance;
  }

  public get children():any[] {
    let ret:any[] = [];
    for (let i=0; i<this._children.length; i++) {
      ret.push(this._children[i].instance);
    }
    return ret;
  }

}

import { Component } from "@angular/core";

@Component({
  selector: 'child-a',
  providers: [],
  template: `
    <div>childA</div>
    <label>only label</label>
  `
})

export class ChildA {

}

import { Component } from "@angular/core";

@Component({
  selector: 'child-b',
  providers: [],
  template: `
    <div>childB</div>
    <select>
      <option *ngFor="let pref of prefs;" [value]="pref">{{pref}}</option> 
    </select>
  `
})

export class ChildB {
  private prefs:string[] = [
    "東京都", "大阪府", "鹿児島県"
  ];
}

import { Component } from "@angular/core";

@Component({
  selector: 'child-c',
  providers: [],
  template: `
    <div>childC</div>
    <input [(ngModel)]="inputValue">
  `
})

export class ChildC {
  private inputValue:string = "";
}