@angular/upgrade
Version:
Angular - the library for easing update from v1 to v2
241 lines • 34.2 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { Directive, ElementRef, EventEmitter, Injector } from '@angular/core';
import { $SCOPE } from '../../src/common/src/constants';
import { UpgradeHelper } from '../../src/common/src/upgrade_helper';
import { isFunction } from '../../src/common/src/util';
const NOT_SUPPORTED = 'NOT_SUPPORTED';
const INITIAL_VALUE = {
__UNINITIALIZED__: true
};
class Bindings {
constructor() {
this.twoWayBoundProperties = [];
this.twoWayBoundLastValues = [];
this.expressionBoundProperties = [];
this.propertyToOutputMap = {};
}
}
/**
* @description
*
* A helper class that allows an AngularJS component to be used from Angular.
*
* *Part of the [upgrade/static](api?query=upgrade%2Fstatic)
* library for hybrid upgrade apps that support AOT compilation.*
*
* This helper class should be used as a base class for creating Angular directives
* that wrap AngularJS components that need to be "upgraded".
*
* @usageNotes
* ### Examples
*
* Let's assume that you have an AngularJS component called `ng1Hero` that needs
* to be made available in Angular templates.
*
* {@example upgrade/static/ts/full/module.ts region="ng1-hero"}
*
* We must create a `Directive` that will make this AngularJS component
* available inside Angular templates.
*
* {@example upgrade/static/ts/full/module.ts region="ng1-hero-wrapper"}
*
* In this example you can see that we must derive from the `UpgradeComponent`
* base class but also provide an {@link Directive `@Directive`} decorator. This is
* because the AOT compiler requires that this information is statically available at
* compile time.
*
* Note that we must do the following:
* * specify the directive's selector (`ng1-hero`)
* * specify all inputs and outputs that the AngularJS component expects
* * derive from `UpgradeComponent`
* * call the base class from the constructor, passing
* * the AngularJS name of the component (`ng1Hero`)
* * the `ElementRef` and `Injector` for the component wrapper
*
* @publicApi
*/
export class UpgradeComponent {
/**
* Create a new `UpgradeComponent` instance. You should not normally need to do this.
* Instead you should derive a new class from this one and call the super constructor
* from the base class.
*
* {@example upgrade/static/ts/full/module.ts region="ng1-hero-wrapper" }
*
* * The `name` parameter should be the name of the AngularJS directive.
* * The `elementRef` and `injector` parameters should be acquired from Angular by dependency
* injection into the base class constructor.
*/
constructor(name, elementRef, injector) {
this.name = name;
this.elementRef = elementRef;
this.injector = injector;
this.helper = new UpgradeHelper(injector, name, elementRef);
this.$injector = this.helper.$injector;
this.element = this.helper.element;
this.$element = this.helper.$element;
this.directive = this.helper.directive;
this.bindings = this.initializeBindings(this.directive);
// We ask for the AngularJS scope from the Angular injector, since
// we will put the new component scope onto the new injector for each component
const $parentScope = injector.get($SCOPE);
// QUESTION 1: Should we create an isolated scope if the scope is only true?
// QUESTION 2: Should we make the scope accessible through `$element.scope()/isolateScope()`?
this.$componentScope = $parentScope.$new(!!this.directive.scope);
this.initializeOutputs();
}
ngOnInit() {
// Collect contents, insert and compile template
const attachChildNodes = this.helper.prepareTransclusion();
const linkFn = this.helper.compileTemplate();
// Instantiate controller
const controllerType = this.directive.controller;
const bindToController = this.directive.bindToController;
if (controllerType) {
this.controllerInstance = this.helper.buildController(controllerType, this.$componentScope);
}
else if (bindToController) {
throw new Error(`Upgraded directive '${this.directive.name}' specifies 'bindToController' but no controller.`);
}
// Set up outputs
this.bindingDestination = bindToController ? this.controllerInstance : this.$componentScope;
this.bindOutputs();
// Require other controllers
const requiredControllers = this.helper.resolveAndBindRequiredControllers(this.controllerInstance);
// Hook: $onChanges
if (this.pendingChanges) {
this.forwardChanges(this.pendingChanges);
this.pendingChanges = null;
}
// Hook: $onInit
if (this.controllerInstance && isFunction(this.controllerInstance.$onInit)) {
this.controllerInstance.$onInit();
}
// Hook: $doCheck
if (this.controllerInstance && isFunction(this.controllerInstance.$doCheck)) {
const callDoCheck = () => this.controllerInstance.$doCheck();
this.unregisterDoCheckWatcher = this.$componentScope.$parent.$watch(callDoCheck);
callDoCheck();
}
// Linking
const link = this.directive.link;
const preLink = typeof link == 'object' && link.pre;
const postLink = typeof link == 'object' ? link.post : link;
const attrs = NOT_SUPPORTED;
const transcludeFn = NOT_SUPPORTED;
if (preLink) {
preLink(this.$componentScope, this.$element, attrs, requiredControllers, transcludeFn);
}
linkFn(this.$componentScope, null, { parentBoundTranscludeFn: attachChildNodes });
if (postLink) {
postLink(this.$componentScope, this.$element, attrs, requiredControllers, transcludeFn);
}
// Hook: $postLink
if (this.controllerInstance && isFunction(this.controllerInstance.$postLink)) {
this.controllerInstance.$postLink();
}
}
ngOnChanges(changes) {
if (!this.bindingDestination) {
this.pendingChanges = changes;
}
else {
this.forwardChanges(changes);
}
}
ngDoCheck() {
const twoWayBoundProperties = this.bindings.twoWayBoundProperties;
const twoWayBoundLastValues = this.bindings.twoWayBoundLastValues;
const propertyToOutputMap = this.bindings.propertyToOutputMap;
twoWayBoundProperties.forEach((propName, idx) => {
const newValue = this.bindingDestination[propName];
const oldValue = twoWayBoundLastValues[idx];
if (!Object.is(newValue, oldValue)) {
const outputName = propertyToOutputMap[propName];
const eventEmitter = this[outputName];
eventEmitter.emit(newValue);
twoWayBoundLastValues[idx] = newValue;
}
});
}
ngOnDestroy() {
if (isFunction(this.unregisterDoCheckWatcher)) {
this.unregisterDoCheckWatcher();
}
this.helper.onDestroy(this.$componentScope, this.controllerInstance);
}
initializeBindings(directive) {
const btcIsObject = typeof directive.bindToController === 'object';
if (btcIsObject && Object.keys(directive.scope).length) {
throw new Error(`Binding definitions on scope and controller at the same time is not supported.`);
}
const context = btcIsObject ? directive.bindToController : directive.scope;
const bindings = new Bindings();
if (typeof context == 'object') {
Object.keys(context).forEach(propName => {
const definition = context[propName];
const bindingType = definition.charAt(0);
// QUESTION: What about `=*`? Ignore? Throw? Support?
switch (bindingType) {
case '@':
case '<':
// We don't need to do anything special. They will be defined as inputs on the
// upgraded component facade and the change propagation will be handled by
// `ngOnChanges()`.
break;
case '=':
bindings.twoWayBoundProperties.push(propName);
bindings.twoWayBoundLastValues.push(INITIAL_VALUE);
bindings.propertyToOutputMap[propName] = propName + 'Change';
break;
case '&':
bindings.expressionBoundProperties.push(propName);
bindings.propertyToOutputMap[propName] = propName;
break;
default:
let json = JSON.stringify(context);
throw new Error(`Unexpected mapping '${bindingType}' in '${json}' in '${this.name}' directive.`);
}
});
}
return bindings;
}
initializeOutputs() {
// Initialize the outputs for `=` and `&` bindings
this.bindings.twoWayBoundProperties.concat(this.bindings.expressionBoundProperties)
.forEach(propName => {
const outputName = this.bindings.propertyToOutputMap[propName];
this[outputName] = new EventEmitter();
});
}
bindOutputs() {
// Bind `&` bindings to the corresponding outputs
this.bindings.expressionBoundProperties.forEach(propName => {
const outputName = this.bindings.propertyToOutputMap[propName];
const emitter = this[outputName];
this.bindingDestination[propName] = (value) => emitter.emit(value);
});
}
forwardChanges(changes) {
// Forward input changes to `bindingDestination`
Object.keys(changes).forEach(propName => this.bindingDestination[propName] = changes[propName].currentValue);
if (isFunction(this.bindingDestination.$onChanges)) {
this.bindingDestination.$onChanges(changes);
}
}
}
UpgradeComponent.decorators = [
{ type: Directive }
];
UpgradeComponent.ctorParameters = () => [
{ type: String },
{ type: ElementRef },
{ type: Injector }
];
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {Directive, DoCheck, ElementRef, EventEmitter, Injector, OnChanges, OnDestroy, OnInit, SimpleChanges} from '@angular/core';\n\nimport {IAttributes, IAugmentedJQuery, IDirective, IInjectorService, ILinkFn, IScope, ITranscludeFunction} from '../../src/common/src/angular1';\nimport {$SCOPE} from '../../src/common/src/constants';\nimport {IBindingDestination, IControllerInstance, UpgradeHelper} from '../../src/common/src/upgrade_helper';\nimport {isFunction} from '../../src/common/src/util';\n\nconst NOT_SUPPORTED: any = 'NOT_SUPPORTED';\nconst INITIAL_VALUE = {\n  __UNINITIALIZED__: true\n};\n\nclass Bindings {\n  twoWayBoundProperties: string[] = [];\n  twoWayBoundLastValues: any[] = [];\n\n  expressionBoundProperties: string[] = [];\n\n  propertyToOutputMap: {[propName: string]: string} = {};\n}\n\n/**\n * @description\n *\n * A helper class that allows an AngularJS component to be used from Angular.\n *\n * *Part of the [upgrade/static](api?query=upgrade%2Fstatic)\n * library for hybrid upgrade apps that support AOT compilation.*\n *\n * This helper class should be used as a base class for creating Angular directives\n * that wrap AngularJS components that need to be \"upgraded\".\n *\n * @usageNotes\n * ### Examples\n *\n * Let's assume that you have an AngularJS component called `ng1Hero` that needs\n * to be made available in Angular templates.\n *\n * {@example upgrade/static/ts/full/module.ts region=\"ng1-hero\"}\n *\n * We must create a `Directive` that will make this AngularJS component\n * available inside Angular templates.\n *\n * {@example upgrade/static/ts/full/module.ts region=\"ng1-hero-wrapper\"}\n *\n * In this example you can see that we must derive from the `UpgradeComponent`\n * base class but also provide an {@link Directive `@Directive`} decorator. This is\n * because the AOT compiler requires that this information is statically available at\n * compile time.\n *\n * Note that we must do the following:\n * * specify the directive's selector (`ng1-hero`)\n * * specify all inputs and outputs that the AngularJS component expects\n * * derive from `UpgradeComponent`\n * * call the base class from the constructor, passing\n *   * the AngularJS name of the component (`ng1Hero`)\n *   * the `ElementRef` and `Injector` for the component wrapper\n *\n * @publicApi\n */\n@Directive()\nexport class UpgradeComponent implements OnInit, OnChanges, DoCheck, OnDestroy {\n  private helper: UpgradeHelper;\n\n  private $injector: IInjectorService;\n\n  private element: Element;\n  private $element: IAugmentedJQuery;\n  private $componentScope: IScope;\n\n  private directive: IDirective;\n  private bindings: Bindings;\n\n  // TODO(issue/24571): remove '!'.\n  private controllerInstance!: IControllerInstance;\n  // TODO(issue/24571): remove '!'.\n  private bindingDestination!: IBindingDestination;\n\n  // We will be instantiating the controller in the `ngOnInit` hook, when the\n  // first `ngOnChanges` will have been already triggered. We store the\n  // `SimpleChanges` and \"play them back\" later.\n  // TODO(issue/24571): remove '!'.\n  private pendingChanges!: SimpleChanges|null;\n\n  // TODO(issue/24571): remove '!'.\n  private unregisterDoCheckWatcher!: Function;\n\n  /**\n   * Create a new `UpgradeComponent` instance. You should not normally need to do this.\n   * Instead you should derive a new class from this one and call the super constructor\n   * from the base class.\n   *\n   * {@example upgrade/static/ts/full/module.ts region=\"ng1-hero-wrapper\" }\n   *\n   * * The `name` parameter should be the name of the AngularJS directive.\n   * * The `elementRef` and `injector` parameters should be acquired from Angular by dependency\n   *   injection into the base class constructor.\n   */\n  constructor(private name: string, private elementRef: ElementRef, private injector: Injector) {\n    this.helper = new UpgradeHelper(injector, name, elementRef);\n\n    this.$injector = this.helper.$injector;\n\n    this.element = this.helper.element;\n    this.$element = this.helper.$element;\n\n    this.directive = this.helper.directive;\n    this.bindings = this.initializeBindings(this.directive);\n\n    // We ask for the AngularJS scope from the Angular injector, since\n    // we will put the new component scope onto the new injector for each component\n    const $parentScope = injector.get($SCOPE);\n    // QUESTION 1: Should we create an isolated scope if the scope is only true?\n    // QUESTION 2: Should we make the scope accessible through `$element.scope()/isolateScope()`?\n    this.$componentScope = $parentScope.$new(!!this.directive.scope);\n\n    this.initializeOutputs();\n  }\n\n  ngOnInit() {\n    // Collect contents, insert and compile template\n    const attachChildNodes: ILinkFn|undefined = this.helper.prepareTransclusion();\n    const linkFn = this.helper.compileTemplate();\n\n    // Instantiate controller\n    const controllerType = this.directive.controller;\n    const bindToController = this.directive.bindToController;\n    if (controllerType) {\n      this.controllerInstance = this.helper.buildController(controllerType, this.$componentScope);\n    } else if (bindToController) {\n      throw new Error(`Upgraded directive '${\n          this.directive.name}' specifies 'bindToController' but no controller.`);\n    }\n\n    // Set up outputs\n    this.bindingDestination = bindToController ? this.controllerInstance : this.$componentScope;\n    this.bindOutputs();\n\n    // Require other controllers\n    const requiredControllers =\n        this.helper.resolveAndBindRequiredControllers(this.controllerInstance);\n\n    // Hook: $onChanges\n    if (this.pendingChanges) {\n      this.forwardChanges(this.pendingChanges);\n      this.pendingChanges = null;\n    }\n\n    // Hook: $onInit\n    if (this.controllerInstance && isFunction(this.controllerInstance.$onInit)) {\n      this.controllerInstance.$onInit();\n    }\n\n    // Hook: $doCheck\n    if (this.controllerInstance && isFunction(this.controllerInstance.$doCheck)) {\n      const callDoCheck = () => this.controllerInstance.$doCheck!();\n\n      this.unregisterDoCheckWatcher = this.$componentScope.$parent.$watch(callDoCheck);\n      callDoCheck();\n    }\n\n    // Linking\n    const link = this.directive.link;\n    const preLink = typeof link == 'object' && link.pre;\n    const postLink = typeof link == 'object' ? link.post : link;\n    const attrs: IAttributes = NOT_SUPPORTED;\n    const transcludeFn: ITranscludeFunction = NOT_SUPPORTED;\n    if (preLink) {\n      preLink(this.$componentScope, this.$element, attrs, requiredControllers, transcludeFn);\n    }\n\n    linkFn(this.$componentScope, null!, {parentBoundTranscludeFn: attachChildNodes});\n\n    if (postLink) {\n      postLink(this.$componentScope, this.$element, attrs, requiredControllers, transcludeFn);\n    }\n\n    // Hook: $postLink\n    if (this.controllerInstance && isFunction(this.controllerInstance.$postLink)) {\n      this.controllerInstance.$postLink();\n    }\n  }\n\n  ngOnChanges(changes: SimpleChanges) {\n    if (!this.bindingDestination) {\n      this.pendingChanges = changes;\n    } else {\n      this.forwardChanges(changes);\n    }\n  }\n\n  ngDoCheck() {\n    const twoWayBoundProperties = this.bindings.twoWayBoundProperties;\n    const twoWayBoundLastValues = this.bindings.twoWayBoundLastValues;\n    const propertyToOutputMap = this.bindings.propertyToOutputMap;\n\n    twoWayBoundProperties.forEach((propName, idx) => {\n      const newValue = this.bindingDestination[propName];\n      const oldValue = twoWayBoundLastValues[idx];\n\n      if (!Object.is(newValue, oldValue)) {\n        const outputName = propertyToOutputMap[propName];\n        const eventEmitter: EventEmitter<any> = (this as any)[outputName];\n\n        eventEmitter.emit(newValue);\n        twoWayBoundLastValues[idx] = newValue;\n      }\n    });\n  }\n\n  ngOnDestroy() {\n    if (isFunction(this.unregisterDoCheckWatcher)) {\n      this.unregisterDoCheckWatcher();\n    }\n    this.helper.onDestroy(this.$componentScope, this.controllerInstance);\n  }\n\n  private initializeBindings(directive: IDirective) {\n    const btcIsObject = typeof directive.bindToController === 'object';\n    if (btcIsObject && Object.keys(directive.scope!).length) {\n      throw new Error(\n          `Binding definitions on scope and controller at the same time is not supported.`);\n    }\n\n    const context = btcIsObject ? directive.bindToController : directive.scope;\n    const bindings = new Bindings();\n\n    if (typeof context == 'object') {\n      Object.keys(context).forEach(propName => {\n        const definition = context[propName];\n        const bindingType = definition.charAt(0);\n\n        // QUESTION: What about `=*`? Ignore? Throw? Support?\n\n        switch (bindingType) {\n          case '@':\n          case '<':\n            // We don't need to do anything special. They will be defined as inputs on the\n            // upgraded component facade and the change propagation will be handled by\n            // `ngOnChanges()`.\n            break;\n          case '=':\n            bindings.twoWayBoundProperties.push(propName);\n            bindings.twoWayBoundLastValues.push(INITIAL_VALUE);\n            bindings.propertyToOutputMap[propName] = propName + 'Change';\n            break;\n          case '&':\n            bindings.expressionBoundProperties.push(propName);\n            bindings.propertyToOutputMap[propName] = propName;\n            break;\n          default:\n            let json = JSON.stringify(context);\n            throw new Error(\n                `Unexpected mapping '${bindingType}' in '${json}' in '${this.name}' directive.`);\n        }\n      });\n    }\n\n    return bindings;\n  }\n\n  private initializeOutputs() {\n    // Initialize the outputs for `=` and `&` bindings\n    this.bindings.twoWayBoundProperties.concat(this.bindings.expressionBoundProperties)\n        .forEach(propName => {\n          const outputName = this.bindings.propertyToOutputMap[propName];\n          (this as any)[outputName] = new EventEmitter();\n        });\n  }\n\n  private bindOutputs() {\n    // Bind `&` bindings to the corresponding outputs\n    this.bindings.expressionBoundProperties.forEach(propName => {\n      const outputName = this.bindings.propertyToOutputMap[propName];\n      const emitter = (this as any)[outputName];\n\n      this.bindingDestination[propName] = (value: any) => emitter.emit(value);\n    });\n  }\n\n  private forwardChanges(changes: SimpleChanges) {\n    // Forward input changes to `bindingDestination`\n    Object.keys(changes).forEach(\n        propName => this.bindingDestination[propName] = changes[propName].currentValue);\n\n    if (isFunction(this.bindingDestination.$onChanges)) {\n      this.bindingDestination.$onChanges(changes);\n    }\n  }\n}\n"]}