@angular/common
Version:
Angular - commonly needed directives and services
172 lines • 19 kB
JavaScript
/**
* @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 { ErrorHandler, ɵɵdefineInjectable, ɵɵinject } from '@angular/core';
import { DOCUMENT } from './dom_tokens';
/**
* Defines a scroll position manager. Implemented by `BrowserViewportScroller`.
*
* @publicApi
*/
var ViewportScroller = /** @class */ (function () {
function ViewportScroller() {
}
// De-sugared tree-shakable injection
// See #23917
/** @nocollapse */
ViewportScroller.ngInjectableDef = ɵɵdefineInjectable({
token: ViewportScroller,
providedIn: 'root',
factory: function () { return new BrowserViewportScroller(ɵɵinject(DOCUMENT), window, ɵɵinject(ErrorHandler)); }
});
return ViewportScroller;
}());
export { ViewportScroller };
/**
* Manages the scroll position for a browser window.
*/
var BrowserViewportScroller = /** @class */ (function () {
function BrowserViewportScroller(document, window, errorHandler) {
this.document = document;
this.window = window;
this.errorHandler = errorHandler;
this.offset = function () { return [0, 0]; };
}
/**
* Configures the top offset used when scrolling to an anchor.
* @param offset A position in screen coordinates (a tuple with x and y values)
* or a function that returns the top offset position.
*
*/
BrowserViewportScroller.prototype.setOffset = function (offset) {
if (Array.isArray(offset)) {
this.offset = function () { return offset; };
}
else {
this.offset = offset;
}
};
/**
* Retrieves the current scroll position.
* @returns The position in screen coordinates.
*/
BrowserViewportScroller.prototype.getScrollPosition = function () {
if (this.supportScrollRestoration()) {
return [this.window.scrollX, this.window.scrollY];
}
else {
return [0, 0];
}
};
/**
* Sets the scroll position.
* @param position The new position in screen coordinates.
*/
BrowserViewportScroller.prototype.scrollToPosition = function (position) {
if (this.supportScrollRestoration()) {
this.window.scrollTo(position[0], position[1]);
}
};
/**
* Scrolls to an anchor element.
* @param anchor The ID of the anchor element.
*/
BrowserViewportScroller.prototype.scrollToAnchor = function (anchor) {
if (this.supportScrollRestoration()) {
// Escape anything passed to `querySelector` as it can throw errors and stop the application
// from working if invalid values are passed.
if (this.window.CSS && this.window.CSS.escape) {
anchor = this.window.CSS.escape(anchor);
}
else {
anchor = anchor.replace(/(\"|\'\ |:|\.|\[|\]|,|=)/g, '\\$1');
}
try {
var elSelectedById = this.document.querySelector("#" + anchor);
if (elSelectedById) {
this.scrollToElement(elSelectedById);
return;
}
var elSelectedByName = this.document.querySelector("[name='" + anchor + "']");
if (elSelectedByName) {
this.scrollToElement(elSelectedByName);
return;
}
}
catch (e) {
this.errorHandler.handleError(e);
}
}
};
/**
* Disables automatic scroll restoration provided by the browser.
*/
BrowserViewportScroller.prototype.setHistoryScrollRestoration = function (scrollRestoration) {
if (this.supportScrollRestoration()) {
var history_1 = this.window.history;
if (history_1 && history_1.scrollRestoration) {
history_1.scrollRestoration = scrollRestoration;
}
}
};
BrowserViewportScroller.prototype.scrollToElement = function (el) {
var rect = el.getBoundingClientRect();
var left = rect.left + this.window.pageXOffset;
var top = rect.top + this.window.pageYOffset;
var offset = this.offset();
this.window.scrollTo(left - offset[0], top - offset[1]);
};
/**
* We only support scroll restoration when we can get a hold of window.
* This means that we do not support this behavior when running in a web worker.
*
* Lifting this restriction right now would require more changes in the dom adapter.
* Since webworkers aren't widely used, we will lift it once RouterScroller is
* battle-tested.
*/
BrowserViewportScroller.prototype.supportScrollRestoration = function () {
try {
return !!this.window && !!this.window.scrollTo;
}
catch (_a) {
return false;
}
};
return BrowserViewportScroller;
}());
export { BrowserViewportScroller };
/**
* Provides an empty implementation of the viewport scroller. This will
* live in @angular/common as it will be used by both platform-server and platform-webworker.
*/
var NullViewportScroller = /** @class */ (function () {
function NullViewportScroller() {
}
/**
* Empty implementation
*/
NullViewportScroller.prototype.setOffset = function (offset) { };
/**
* Empty implementation
*/
NullViewportScroller.prototype.getScrollPosition = function () { return [0, 0]; };
/**
* Empty implementation
*/
NullViewportScroller.prototype.scrollToPosition = function (position) { };
/**
* Empty implementation
*/
NullViewportScroller.prototype.scrollToAnchor = function (anchor) { };
/**
* Empty implementation
*/
NullViewportScroller.prototype.setHistoryScrollRestoration = function (scrollRestoration) { };
return NullViewportScroller;
}());
export { NullViewportScroller };
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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 */\n\nimport {ErrorHandler, ɵɵdefineInjectable, ɵɵinject} from '@angular/core';\n\nimport {DOCUMENT} from './dom_tokens';\n\n\n\n/**\n * Defines a scroll position manager. Implemented by `BrowserViewportScroller`.\n *\n * @publicApi\n */\nexport abstract class ViewportScroller {\n  // De-sugared tree-shakable injection\n  // See #23917\n  /** @nocollapse */\n  static ngInjectableDef = ɵɵdefineInjectable({\n    token: ViewportScroller,\n    providedIn: 'root',\n    factory: () => new BrowserViewportScroller(ɵɵinject(DOCUMENT), window, ɵɵinject(ErrorHandler))\n  });\n\n  /**\n   * Configures the top offset used when scrolling to an anchor.\n   * @param offset A position in screen coordinates (a tuple with x and y values)\n   * or a function that returns the top offset position.\n   *\n   */\n  abstract setOffset(offset: [number, number]|(() => [number, number])): void;\n\n  /**\n   * Retrieves the current scroll position.\n   * @returns A position in screen coordinates (a tuple with x and y values).\n   */\n  abstract getScrollPosition(): [number, number];\n\n  /**\n   * Scrolls to a specified position.\n   * @param position A position in screen coordinates (a tuple with x and y values).\n   */\n  abstract scrollToPosition(position: [number, number]): void;\n\n  /**\n   * Scrolls to an anchor element.\n   * @param anchor The ID of the anchor element.\n   */\n  abstract scrollToAnchor(anchor: string): void;\n\n  /**\n   * Disables automatic scroll restoration provided by the browser.\n   * See also [window.history.scrollRestoration\n   * info](https://developers.google.com/web/updates/2015/09/history-api-scroll-restoration).\n   */\n  abstract setHistoryScrollRestoration(scrollRestoration: 'auto'|'manual'): void;\n}\n\n/**\n * Manages the scroll position for a browser window.\n */\nexport class BrowserViewportScroller implements ViewportScroller {\n  private offset: () => [number, number] = () => [0, 0];\n\n  constructor(private document: any, private window: any, private errorHandler: ErrorHandler) {}\n\n  /**\n   * Configures the top offset used when scrolling to an anchor.\n   * @param offset A position in screen coordinates (a tuple with x and y values)\n   * or a function that returns the top offset position.\n   *\n   */\n  setOffset(offset: [number, number]|(() => [number, number])): void {\n    if (Array.isArray(offset)) {\n      this.offset = () => offset;\n    } else {\n      this.offset = offset;\n    }\n  }\n\n  /**\n   * Retrieves the current scroll position.\n   * @returns The position in screen coordinates.\n   */\n  getScrollPosition(): [number, number] {\n    if (this.supportScrollRestoration()) {\n      return [this.window.scrollX, this.window.scrollY];\n    } else {\n      return [0, 0];\n    }\n  }\n\n  /**\n   * Sets the scroll position.\n   * @param position The new position in screen coordinates.\n   */\n  scrollToPosition(position: [number, number]): void {\n    if (this.supportScrollRestoration()) {\n      this.window.scrollTo(position[0], position[1]);\n    }\n  }\n\n  /**\n   * Scrolls to an anchor element.\n   * @param anchor The ID of the anchor element.\n   */\n  scrollToAnchor(anchor: string): void {\n    if (this.supportScrollRestoration()) {\n      // Escape anything passed to `querySelector` as it can throw errors and stop the application\n      // from working if invalid values are passed.\n      if (this.window.CSS && this.window.CSS.escape) {\n        anchor = this.window.CSS.escape(anchor);\n      } else {\n        anchor = anchor.replace(/(\\\"|\\'\\ |:|\\.|\\[|\\]|,|=)/g, '\\\\$1');\n      }\n      try {\n        const elSelectedById = this.document.querySelector(`#${anchor}`);\n        if (elSelectedById) {\n          this.scrollToElement(elSelectedById);\n          return;\n        }\n        const elSelectedByName = this.document.querySelector(`[name='${anchor}']`);\n        if (elSelectedByName) {\n          this.scrollToElement(elSelectedByName);\n          return;\n        }\n      } catch (e) {\n        this.errorHandler.handleError(e);\n      }\n    }\n  }\n\n  /**\n   * Disables automatic scroll restoration provided by the browser.\n   */\n  setHistoryScrollRestoration(scrollRestoration: 'auto'|'manual'): void {\n    if (this.supportScrollRestoration()) {\n      const history = this.window.history;\n      if (history && history.scrollRestoration) {\n        history.scrollRestoration = scrollRestoration;\n      }\n    }\n  }\n\n  private scrollToElement(el: any): void {\n    const rect = el.getBoundingClientRect();\n    const left = rect.left + this.window.pageXOffset;\n    const top = rect.top + this.window.pageYOffset;\n    const offset = this.offset();\n    this.window.scrollTo(left - offset[0], top - offset[1]);\n  }\n\n  /**\n   * We only support scroll restoration when we can get a hold of window.\n   * This means that we do not support this behavior when running in a web worker.\n   *\n   * Lifting this restriction right now would require more changes in the dom adapter.\n   * Since webworkers aren't widely used, we will lift it once RouterScroller is\n   * battle-tested.\n   */\n  private supportScrollRestoration(): boolean {\n    try {\n      return !!this.window && !!this.window.scrollTo;\n    } catch {\n      return false;\n    }\n  }\n}\n\n\n/**\n * Provides an empty implementation of the viewport scroller. This will\n * live in @angular/common as it will be used by both platform-server and platform-webworker.\n */\nexport class NullViewportScroller implements ViewportScroller {\n  /**\n   * Empty implementation\n   */\n  setOffset(offset: [number, number]|(() => [number, number])): void {}\n\n  /**\n   * Empty implementation\n   */\n  getScrollPosition(): [number, number] { return [0, 0]; }\n\n  /**\n   * Empty implementation\n   */\n  scrollToPosition(position: [number, number]): void {}\n\n  /**\n   * Empty implementation\n   */\n  scrollToAnchor(anchor: string): void {}\n\n  /**\n   * Empty implementation\n   */\n  setHistoryScrollRestoration(scrollRestoration: 'auto'|'manual'): void {}\n}\n"]}