@angular/common
Version:
Angular - commonly needed directives and services
110 lines • 12.9 kB
JavaScript
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, KeyValueDiffers, Renderer2 } from '@angular/core';
import { StylingDiffer } from './styling_differ';
/**
* Used as a token for an injected service within the NgStyle directive.
*
* NgStyle 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 `[style]` binding) will be used. This toggle behavior is done so
* via the ivy_switch mechanism.
*/
var NgStyleImpl = /** @class */ (function () {
function NgStyleImpl() {
}
return NgStyleImpl;
}());
export { NgStyleImpl };
var NgStyleR2Impl = /** @class */ (function () {
function NgStyleR2Impl(_ngEl, _differs, _renderer) {
this._ngEl = _ngEl;
this._differs = _differs;
this._renderer = _renderer;
}
NgStyleR2Impl.prototype.getValue = function () { return null; };
/**
* A map of style properties, specified as colon-separated
* key-value pairs.
* * The key is a style name, with an optional `.<unit>` suffix
* (such as 'top.px', 'font-style.em').
* * The value is an expression to be evaluated.
*/
NgStyleR2Impl.prototype.setNgStyle = function (values) {
this._ngStyle = values;
if (!this._differ && values) {
this._differ = this._differs.find(values).create();
}
};
/**
* Applies the new styles if needed.
*/
NgStyleR2Impl.prototype.applyChanges = function () {
if (this._differ) {
var changes = this._differ.diff(this._ngStyle);
if (changes) {
this._applyChanges(changes);
}
}
};
NgStyleR2Impl.prototype._applyChanges = function (changes) {
var _this = this;
changes.forEachRemovedItem(function (record) { return _this._setStyle(record.key, null); });
changes.forEachAddedItem(function (record) { return _this._setStyle(record.key, record.currentValue); });
changes.forEachChangedItem(function (record) { return _this._setStyle(record.key, record.currentValue); });
};
NgStyleR2Impl.prototype._setStyle = function (nameAndUnit, value) {
var _a = tslib_1.__read(nameAndUnit.split('.'), 2), name = _a[0], unit = _a[1];
value = value != null && unit ? "" + value + unit : value;
if (value != null) {
this._renderer.setStyle(this._ngEl.nativeElement, name, value);
}
else {
this._renderer.removeStyle(this._ngEl.nativeElement, name);
}
};
NgStyleR2Impl = tslib_1.__decorate([
Injectable(),
tslib_1.__metadata("design:paramtypes", [ElementRef, KeyValueDiffers, Renderer2])
], NgStyleR2Impl);
return NgStyleR2Impl;
}());
export { NgStyleR2Impl };
var NgStyleR3Impl = /** @class */ (function () {
function NgStyleR3Impl() {
this._differ = new StylingDiffer('NgStyle', 8 /* AllowUnits */);
this._value = null;
}
NgStyleR3Impl.prototype.getValue = function () { return this._value; };
NgStyleR3Impl.prototype.setNgStyle = function (value) { this._differ.setValue(value); };
NgStyleR3Impl.prototype.applyChanges = function () {
if (this._differ.hasValueChanged()) {
this._value = this._differ.value;
}
};
NgStyleR3Impl = tslib_1.__decorate([
Injectable()
], NgStyleR3Impl);
return NgStyleR3Impl;
}());
export { NgStyleR3Impl };
// the implementation for both NgClassR2Impl and NgClassR3Impl are
// not ivy_switch'd away, instead they are only hooked up into the
// DI via NgStyle's directive's provider property.
export var NgStyleImplProvider__PRE_R3__ = {
provide: NgStyleImpl,
useClass: NgStyleR2Impl
};
export var NgStyleImplProvider__POST_R3__ = {
provide: NgStyleImpl,
useClass: NgStyleR3Impl
};
export var NgStyleImplProvider = NgStyleImplProvider__PRE_R3__;
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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, KeyValueChanges, KeyValueDiffer, KeyValueDiffers, Renderer2} from '@angular/core';\n\nimport {StylingDiffer, StylingDifferOptions} from './styling_differ';\n\n/**\n * Used as a token for an injected service within the NgStyle directive.\n *\n * NgStyle 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 `[style]` binding) will be used. This toggle behavior is done so\n * via the ivy_switch mechanism.\n */\nexport abstract class NgStyleImpl {\n  abstract getValue(): {[key: string]: any}|null;\n  abstract setNgStyle(value: {[key: string]: any}|null): void;\n  abstract applyChanges(): void;\n}\n\n@Injectable()\nexport class NgStyleR2Impl implements NgStyleImpl {\n  // TODO(issue/24571): remove '!'.\n  private _ngStyle !: {[key: string]: string};\n  // TODO(issue/24571): remove '!'.\n  private _differ !: KeyValueDiffer<string, string|number>;\n\n  constructor(\n      private _ngEl: ElementRef, private _differs: KeyValueDiffers, private _renderer: Renderer2) {}\n\n  getValue() { return null; }\n\n  /**\n   * A map of style properties, specified as colon-separated\n   * key-value pairs.\n   * * The key is a style name, with an optional `.<unit>` suffix\n   *    (such as 'top.px', 'font-style.em').\n   * * The value is an expression to be evaluated.\n   */\n  setNgStyle(values: {[key: string]: string}) {\n    this._ngStyle = values;\n    if (!this._differ && values) {\n      this._differ = this._differs.find(values).create();\n    }\n  }\n\n  /**\n   * Applies the new styles if needed.\n   */\n  applyChanges() {\n    if (this._differ) {\n      const changes = this._differ.diff(this._ngStyle);\n      if (changes) {\n        this._applyChanges(changes);\n      }\n    }\n  }\n\n  private _applyChanges(changes: KeyValueChanges<string, string|number>): void {\n    changes.forEachRemovedItem((record) => this._setStyle(record.key, null));\n    changes.forEachAddedItem((record) => this._setStyle(record.key, record.currentValue));\n    changes.forEachChangedItem((record) => this._setStyle(record.key, record.currentValue));\n  }\n\n  private _setStyle(nameAndUnit: string, value: string|number|null|undefined): void {\n    const [name, unit] = nameAndUnit.split('.');\n    value = value != null && unit ? `${value}${unit}` : value;\n\n    if (value != null) {\n      this._renderer.setStyle(this._ngEl.nativeElement, name, value as string);\n    } else {\n      this._renderer.removeStyle(this._ngEl.nativeElement, name);\n    }\n  }\n}\n\n@Injectable()\nexport class NgStyleR3Impl implements NgStyleImpl {\n  private _differ =\n      new StylingDiffer<{[key: string]: any}|null>('NgStyle', StylingDifferOptions.AllowUnits);\n\n  private _value: {[key: string]: any}|null = null;\n\n  getValue() { return this._value; }\n\n  setNgStyle(value: {[key: string]: any}|null) { this._differ.setValue(value); }\n\n  applyChanges() {\n    if (this._differ.hasValueChanged()) {\n      this._value = this._differ.value;\n    }\n  }\n}\n\n// the implementation for both NgClassR2Impl and NgClassR3Impl 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 NgStyleImplProvider__PRE_R3__ = {\n  provide: NgStyleImpl,\n  useClass: NgStyleR2Impl\n};\n\nexport const NgStyleImplProvider__POST_R3__ = {\n  provide: NgStyleImpl,\n  useClass: NgStyleR3Impl\n};\n\nexport const NgStyleImplProvider = NgStyleImplProvider__PRE_R3__;\n"]}