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@angular/common

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Angular - commonly needed directives and services

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import * as tslib_1 from "tslib"; /** * @license * Copyright Google Inc. 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 { ElementRef, Injectable, IterableDiffers, KeyValueDiffers, Renderer2, ɵisListLikeIterable as isListLikeIterable, ɵstringify as stringify } from '@angular/core'; import { StylingDiffer } from './styling_differ'; /** * Used as a token for an injected service within the NgClass directive. * * NgClass behaves differenly whether or not VE is being used or not. If * present then the legacy ngClass diffing algorithm will be used as an * injected service. Otherwise the new diffing algorithm (which delegates * to the `[class]` binding) will be used. This toggle behavior is done so * via the ivy_switch mechanism. */ var NgClassImpl = /** @class */ (function () { function NgClassImpl() { } return NgClassImpl; }()); export { NgClassImpl }; var NgClassR2Impl = /** @class */ (function () { function NgClassR2Impl(_iterableDiffers, _keyValueDiffers, _ngEl, _renderer) { this._iterableDiffers = _iterableDiffers; this._keyValueDiffers = _keyValueDiffers; this._ngEl = _ngEl; this._renderer = _renderer; this._initialClasses = []; } NgClassR2Impl.prototype.getValue = function () { return null; }; NgClassR2Impl.prototype.setClass = function (value) { this._removeClasses(this._initialClasses); this._initialClasses = typeof value === 'string' ? value.split(/\s+/) : []; this._applyClasses(this._initialClasses); this._applyClasses(this._rawClass); }; NgClassR2Impl.prototype.setNgClass = function (value) { this._removeClasses(this._rawClass); this._applyClasses(this._initialClasses); this._iterableDiffer = null; this._keyValueDiffer = null; this._rawClass = typeof value === 'string' ? value.split(/\s+/) : value; if (this._rawClass) { if (isListLikeIterable(this._rawClass)) { this._iterableDiffer = this._iterableDiffers.find(this._rawClass).create(); } else { this._keyValueDiffer = this._keyValueDiffers.find(this._rawClass).create(); } } }; NgClassR2Impl.prototype.applyChanges = function () { if (this._iterableDiffer) { var iterableChanges = this._iterableDiffer.diff(this._rawClass); if (iterableChanges) { this._applyIterableChanges(iterableChanges); } } else if (this._keyValueDiffer) { var keyValueChanges = this._keyValueDiffer.diff(this._rawClass); if (keyValueChanges) { this._applyKeyValueChanges(keyValueChanges); } } }; NgClassR2Impl.prototype._applyKeyValueChanges = function (changes) { var _this = this; changes.forEachAddedItem(function (record) { return _this._toggleClass(record.key, record.currentValue); }); changes.forEachChangedItem(function (record) { return _this._toggleClass(record.key, record.currentValue); }); changes.forEachRemovedItem(function (record) { if (record.previousValue) { _this._toggleClass(record.key, false); } }); }; NgClassR2Impl.prototype._applyIterableChanges = function (changes) { var _this = this; changes.forEachAddedItem(function (record) { if (typeof record.item === 'string') { _this._toggleClass(record.item, true); } else { throw new Error("NgClass can only toggle CSS classes expressed as strings, got " + stringify(record.item)); } }); changes.forEachRemovedItem(function (record) { return _this._toggleClass(record.item, false); }); }; /** * Applies a collection of CSS classes to the DOM element. * * For argument of type Set and Array CSS class names contained in those collections are always * added. * For argument of type Map CSS class name in the map's key is toggled based on the value (added * for truthy and removed for falsy). */ NgClassR2Impl.prototype._applyClasses = function (rawClassVal) { var _this = this; if (rawClassVal) { if (Array.isArray(rawClassVal) || rawClassVal instanceof Set) { rawClassVal.forEach(function (klass) { return _this._toggleClass(klass, true); }); } else { Object.keys(rawClassVal).forEach(function (klass) { return _this._toggleClass(klass, !!rawClassVal[klass]); }); } } }; /** * Removes a collection of CSS classes from the DOM element. This is mostly useful for cleanup * purposes. */ NgClassR2Impl.prototype._removeClasses = function (rawClassVal) { var _this = this; if (rawClassVal) { if (Array.isArray(rawClassVal) || rawClassVal instanceof Set) { rawClassVal.forEach(function (klass) { return _this._toggleClass(klass, false); }); } else { Object.keys(rawClassVal).forEach(function (klass) { return _this._toggleClass(klass, false); }); } } }; NgClassR2Impl.prototype._toggleClass = function (klass, enabled) { var _this = this; klass = klass.trim(); if (klass) { klass.split(/\s+/g).forEach(function (klass) { if (enabled) { _this._renderer.addClass(_this._ngEl.nativeElement, klass); } else { _this._renderer.removeClass(_this._ngEl.nativeElement, klass); } }); } }; NgClassR2Impl = tslib_1.__decorate([ Injectable(), tslib_1.__metadata("design:paramtypes", [IterableDiffers, KeyValueDiffers, ElementRef, Renderer2]) ], NgClassR2Impl); return NgClassR2Impl; }()); export { NgClassR2Impl }; var NgClassR3Impl = /** @class */ (function () { function NgClassR3Impl() { this._value = null; this._ngClassDiffer = new StylingDiffer('NgClass', 1 /* TrimProperties */ | 2 /* AllowSubKeys */ | 4 /* AllowStringValue */ | 16 /* ForceAsMap */); this._classStringDiffer = null; } NgClassR3Impl.prototype.getValue = function () { return this._value; }; NgClassR3Impl.prototype.setClass = function (value) { // early exit incase the binding gets emitted as an empty value which // means there is no reason to instantiate and diff the values... if (!value && !this._classStringDiffer) return; this._classStringDiffer = this._classStringDiffer || new StylingDiffer('class', 4 /* AllowStringValue */ | 16 /* ForceAsMap */); this._classStringDiffer.setValue(value); }; NgClassR3Impl.prototype.setNgClass = function (value) { this._ngClassDiffer.setValue(value); }; NgClassR3Impl.prototype.applyChanges = function () { var classChanged = this._classStringDiffer ? this._classStringDiffer.hasValueChanged() : false; var ngClassChanged = this._ngClassDiffer.hasValueChanged(); if (classChanged || ngClassChanged) { var value = this._ngClassDiffer.value; if (this._classStringDiffer) { var classValue = this._classStringDiffer.value; if (classValue) { value = value ? tslib_1.__assign({}, classValue, value) : classValue; } } this._value = value; } }; NgClassR3Impl = tslib_1.__decorate([ Injectable() ], NgClassR3Impl); return NgClassR3Impl; }()); export { NgClassR3Impl }; // the implementation for both NgStyleR2Impl and NgStyleR3Impl are // not ivy_switch'd away, instead they are only hooked up into the // DI via NgStyle's directive's provider property. export var NgClassImplProvider__PRE_R3__ = { provide: NgClassImpl, useClass: NgClassR2Impl }; export var NgClassImplProvider__POST_R3__ = { provide: NgClassImpl, useClass: NgClassR3Impl }; export var NgClassImplProvider = NgClassImplProvider__PRE_R3__; //# 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* @license\n * Copyright Google Inc. 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 */\nimport {ElementRef, Injectable, IterableChanges, IterableDiffer, IterableDiffers, KeyValueChanges, KeyValueDiffer, KeyValueDiffers, Renderer2, ɵisListLikeIterable as isListLikeIterable, ɵstringify as stringify} from '@angular/core';\n\nimport {StylingDiffer, StylingDifferOptions} from './styling_differ';\n\n/**\n * Used as a token for an injected service within the NgClass directive.\n *\n * NgClass behaves differenly whether or not VE is being used or not. If\n * present then the legacy ngClass diffing algorithm will be used as an\n * injected service. Otherwise the new diffing algorithm (which delegates\n * to the `[class]` binding) will be used. This toggle behavior is done so\n * via the ivy_switch mechanism.\n */\nexport abstract class NgClassImpl {\n  abstract setClass(value: string): void;\n  abstract setNgClass(value: string|string[]|Set<string>|{[klass: string]: any}): void;\n  abstract applyChanges(): void;\n  abstract getValue(): {[key: string]: any}|null;\n}\n\n@Injectable()\nexport class NgClassR2Impl implements NgClassImpl {\n  // TODO(issue/24571): remove '!'.\n  private _iterableDiffer !: IterableDiffer<string>| null;\n  // TODO(issue/24571): remove '!'.\n  private _keyValueDiffer !: KeyValueDiffer<string, any>| null;\n  private _initialClasses: string[] = [];\n  // TODO(issue/24571): remove '!'.\n  private _rawClass !: string[] | Set<string>| {[klass: string]: any};\n\n  constructor(\n      private _iterableDiffers: IterableDiffers, private _keyValueDiffers: KeyValueDiffers,\n      private _ngEl: ElementRef, private _renderer: Renderer2) {}\n\n  getValue() { return null; }\n\n  setClass(value: string) {\n    this._removeClasses(this._initialClasses);\n    this._initialClasses = typeof value === 'string' ? value.split(/\\s+/) : [];\n    this._applyClasses(this._initialClasses);\n    this._applyClasses(this._rawClass);\n  }\n\n  setNgClass(value: string) {\n    this._removeClasses(this._rawClass);\n    this._applyClasses(this._initialClasses);\n\n    this._iterableDiffer = null;\n    this._keyValueDiffer = null;\n\n    this._rawClass = typeof value === 'string' ? value.split(/\\s+/) : value;\n\n    if (this._rawClass) {\n      if (isListLikeIterable(this._rawClass)) {\n        this._iterableDiffer = this._iterableDiffers.find(this._rawClass).create();\n      } else {\n        this._keyValueDiffer = this._keyValueDiffers.find(this._rawClass).create();\n      }\n    }\n  }\n\n  applyChanges() {\n    if (this._iterableDiffer) {\n      const iterableChanges = this._iterableDiffer.diff(this._rawClass as string[]);\n      if (iterableChanges) {\n        this._applyIterableChanges(iterableChanges);\n      }\n    } else if (this._keyValueDiffer) {\n      const keyValueChanges = this._keyValueDiffer.diff(this._rawClass as{[k: string]: any});\n      if (keyValueChanges) {\n        this._applyKeyValueChanges(keyValueChanges);\n      }\n    }\n  }\n\n  private _applyKeyValueChanges(changes: KeyValueChanges<string, any>): void {\n    changes.forEachAddedItem((record) => this._toggleClass(record.key, record.currentValue));\n    changes.forEachChangedItem((record) => this._toggleClass(record.key, record.currentValue));\n    changes.forEachRemovedItem((record) => {\n      if (record.previousValue) {\n        this._toggleClass(record.key, false);\n      }\n    });\n  }\n\n  private _applyIterableChanges(changes: IterableChanges<string>): void {\n    changes.forEachAddedItem((record) => {\n      if (typeof record.item === 'string') {\n        this._toggleClass(record.item, true);\n      } else {\n        throw new Error(\n            `NgClass can only toggle CSS classes expressed as strings, got ${stringify(record.item)}`);\n      }\n    });\n\n    changes.forEachRemovedItem((record) => this._toggleClass(record.item, false));\n  }\n\n  /**\n   * Applies a collection of CSS classes to the DOM element.\n   *\n   * For argument of type Set and Array CSS class names contained in those collections are always\n   * added.\n   * For argument of type Map CSS class name in the map's key is toggled based on the value (added\n   * for truthy and removed for falsy).\n   */\n  private _applyClasses(rawClassVal: string[]|Set<string>|{[klass: string]: any}) {\n    if (rawClassVal) {\n      if (Array.isArray(rawClassVal) || rawClassVal instanceof Set) {\n        (<any>rawClassVal).forEach((klass: string) => this._toggleClass(klass, true));\n      } else {\n        Object.keys(rawClassVal).forEach(klass => this._toggleClass(klass, !!rawClassVal[klass]));\n      }\n    }\n  }\n\n  /**\n   * Removes a collection of CSS classes from the DOM element. This is mostly useful for cleanup\n   * purposes.\n   */\n  private _removeClasses(rawClassVal: string[]|Set<string>|{[klass: string]: any}) {\n    if (rawClassVal) {\n      if (Array.isArray(rawClassVal) || rawClassVal instanceof Set) {\n        (<any>rawClassVal).forEach((klass: string) => this._toggleClass(klass, false));\n      } else {\n        Object.keys(rawClassVal).forEach(klass => this._toggleClass(klass, false));\n      }\n    }\n  }\n\n  private _toggleClass(klass: string, enabled: boolean): void {\n    klass = klass.trim();\n    if (klass) {\n      klass.split(/\\s+/g).forEach(klass => {\n        if (enabled) {\n          this._renderer.addClass(this._ngEl.nativeElement, klass);\n        } else {\n          this._renderer.removeClass(this._ngEl.nativeElement, klass);\n        }\n      });\n    }\n  }\n}\n\n@Injectable()\nexport class NgClassR3Impl implements NgClassImpl {\n  private _value: {[key: string]: boolean}|null = null;\n  private _ngClassDiffer = new StylingDiffer<{[key: string]: boolean}|null>(\n      'NgClass', StylingDifferOptions.TrimProperties|\n                 StylingDifferOptions.AllowSubKeys|\n                 StylingDifferOptions.AllowStringValue|StylingDifferOptions.ForceAsMap);\n  private _classStringDiffer: StylingDiffer<{[key: string]: boolean}>|null = null;\n\n  getValue() { return this._value; }\n\n  setClass(value: string) {\n    // early exit incase the binding gets emitted as an empty value which\n    // means there is no reason to instantiate and diff the values...\n    if (!value && !this._classStringDiffer) return;\n\n    this._classStringDiffer = this._classStringDiffer ||\n        new StylingDiffer('class',\n                          StylingDifferOptions.AllowStringValue | StylingDifferOptions.ForceAsMap);\n    this._classStringDiffer.setValue(value);\n  }\n\n  setNgClass(value: string|string[]|Set<string>|{[klass: string]: any}) {\n    this._ngClassDiffer.setValue(value);\n  }\n\n  applyChanges() {\n    const classChanged =\n        this._classStringDiffer ? this._classStringDiffer.hasValueChanged() : false;\n    const ngClassChanged = this._ngClassDiffer.hasValueChanged();\n    if (classChanged || ngClassChanged) {\n      let value = this._ngClassDiffer.value;\n      if (this._classStringDiffer) {\n        let classValue = this._classStringDiffer.value;\n        if (classValue) {\n          value = value ? {...classValue, ...value} : classValue;\n        }\n      }\n      this._value = value;\n    }\n  }\n}\n\n// the implementation for both NgStyleR2Impl and NgStyleR3Impl are\n// not ivy_switch'd away, instead they are only hooked up into the\n// DI via NgStyle's directive's provider property.\nexport const NgClassImplProvider__PRE_R3__ = {\n  provide: NgClassImpl,\n  useClass: NgClassR2Impl\n};\n\nexport const NgClassImplProvider__POST_R3__ = {\n  provide: NgClassImpl,\n  useClass: NgClassR3Impl\n};\n\nexport const NgClassImplProvider = NgClassImplProvider__PRE_R3__;\n"]}