@angular/common
Version:
Angular - commonly needed directives and services
211 lines • 24.5 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 { ɵɵdefineInjectable, ɵɵinject } from '@angular/core';
import { DOCUMENT } from './dom_tokens';
/**
* Defines a scroll position manager. Implemented by `BrowserViewportScroller`.
*
* @publicApi
*/
class ViewportScroller {
// De-sugared tree-shakable injection
// See #23917
/** @nocollapse */
static { this.ɵprov = ɵɵdefineInjectable({
token: ViewportScroller,
providedIn: 'root',
factory: () => new BrowserViewportScroller(ɵɵinject(DOCUMENT), window)
}); }
}
export { ViewportScroller };
/**
* Manages the scroll position for a browser window.
*/
export class BrowserViewportScroller {
constructor(document, window) {
this.document = document;
this.window = window;
this.offset = () => [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.
*
*/
setOffset(offset) {
if (Array.isArray(offset)) {
this.offset = () => offset;
}
else {
this.offset = offset;
}
}
/**
* Retrieves the current scroll position.
* @returns The position in screen coordinates.
*/
getScrollPosition() {
if (this.supportsScrolling()) {
return [this.window.pageXOffset, this.window.pageYOffset];
}
else {
return [0, 0];
}
}
/**
* Sets the scroll position.
* @param position The new position in screen coordinates.
*/
scrollToPosition(position) {
if (this.supportsScrolling()) {
this.window.scrollTo(position[0], position[1]);
}
}
/**
* Scrolls to an element and attempts to focus the element.
*
* Note that the function name here is misleading in that the target string may be an ID for a
* non-anchor element.
*
* @param target The ID of an element or name of the anchor.
*
* @see https://html.spec.whatwg.org/#the-indicated-part-of-the-document
* @see https://html.spec.whatwg.org/#scroll-to-fragid
*/
scrollToAnchor(target) {
if (!this.supportsScrolling()) {
return;
}
const elSelected = findAnchorFromDocument(this.document, target);
if (elSelected) {
this.scrollToElement(elSelected);
// After scrolling to the element, the spec dictates that we follow the focus steps for the
// target. Rather than following the robust steps, simply attempt focus.
//
// @see https://html.spec.whatwg.org/#get-the-focusable-area
// @see https://developer.mozilla.org/en-US/docs/Web/API/HTMLOrForeignElement/focus
// @see https://html.spec.whatwg.org/#focusable-area
elSelected.focus();
}
}
/**
* Disables automatic scroll restoration provided by the browser.
*/
setHistoryScrollRestoration(scrollRestoration) {
if (this.supportScrollRestoration()) {
const history = this.window.history;
if (history && history.scrollRestoration) {
history.scrollRestoration = scrollRestoration;
}
}
}
/**
* Scrolls to an element using the native offset and the specified offset set on this scroller.
*
* The offset can be used when we know that there is a floating header and scrolling naively to an
* element (ex: `scrollIntoView`) leaves the element hidden behind the floating header.
*/
scrollToElement(el) {
const rect = el.getBoundingClientRect();
const left = rect.left + this.window.pageXOffset;
const top = rect.top + this.window.pageYOffset;
const 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.
*/
supportScrollRestoration() {
try {
if (!this.supportsScrolling()) {
return false;
}
// The `scrollRestoration` property could be on the `history` instance or its prototype.
const scrollRestorationDescriptor = getScrollRestorationProperty(this.window.history) ||
getScrollRestorationProperty(Object.getPrototypeOf(this.window.history));
// We can write to the `scrollRestoration` property if it is a writable data field or it has a
// setter function.
return !!scrollRestorationDescriptor &&
!!(scrollRestorationDescriptor.writable || scrollRestorationDescriptor.set);
}
catch {
return false;
}
}
supportsScrolling() {
try {
return !!this.window && !!this.window.scrollTo && 'pageXOffset' in this.window;
}
catch {
return false;
}
}
}
function getScrollRestorationProperty(obj) {
return Object.getOwnPropertyDescriptor(obj, 'scrollRestoration');
}
function findAnchorFromDocument(document, target) {
const documentResult = document.getElementById(target) || document.getElementsByName(target)[0];
if (documentResult) {
return documentResult;
}
// `getElementById` and `getElementsByName` won't pierce through the shadow DOM so we
// have to traverse the DOM manually and do the lookup through the shadow roots.
if (typeof document.createTreeWalker === 'function' && document.body &&
typeof document.body.attachShadow === 'function') {
const treeWalker = document.createTreeWalker(document.body, NodeFilter.SHOW_ELEMENT);
let currentNode = treeWalker.currentNode;
while (currentNode) {
const shadowRoot = currentNode.shadowRoot;
if (shadowRoot) {
// Note that `ShadowRoot` doesn't support `getElementsByName`
// so we have to fall back to `querySelector`.
const result = shadowRoot.getElementById(target) || shadowRoot.querySelector(`[name="${target}"]`);
if (result) {
return result;
}
}
currentNode = treeWalker.nextNode();
}
}
return null;
}
/**
* Provides an empty implementation of the viewport scroller.
*/
export class NullViewportScroller {
/**
* Empty implementation
*/
setOffset(offset) { }
/**
* Empty implementation
*/
getScrollPosition() {
return [0, 0];
}
/**
* Empty implementation
*/
scrollToPosition(position) { }
/**
* Empty implementation
*/
scrollToAnchor(anchor) { }
/**
* Empty implementation
*/
setHistoryScrollRestoration(scrollRestoration) { }
}
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Implemented by `BrowserViewportScroller`.\n *\n * @publicApi\n */\nexport abstract class ViewportScroller {\n  // De-sugared tree-shakable injection\n  // See #23917\n  /** @nocollapse */\n  static ɵprov = /** @pureOrBreakMyCode */ ɵɵdefineInjectable({\n    token: ViewportScroller,\n    providedIn: 'root',\n    factory: () => new BrowserViewportScroller(ɵɵinject(DOCUMENT), window)\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: Document, private window: Window) {}\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.supportsScrolling()) {\n      return [this.window.pageXOffset, this.window.pageYOffset];\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.supportsScrolling()) {\n      this.window.scrollTo(position[0], position[1]);\n    }\n  }\n\n  /**\n   * Scrolls to an element and attempts to focus the element.\n   *\n   * Note that the function name here is misleading in that the target string may be an ID for a\n   * non-anchor element.\n   *\n   * @param target The ID of an element or name of the anchor.\n   *\n   * @see https://html.spec.whatwg.org/#the-indicated-part-of-the-document\n   * @see https://html.spec.whatwg.org/#scroll-to-fragid\n   */\n  scrollToAnchor(target: string): void {\n    if (!this.supportsScrolling()) {\n      return;\n    }\n\n    const elSelected = findAnchorFromDocument(this.document, target);\n\n    if (elSelected) {\n      this.scrollToElement(elSelected);\n      // After scrolling to the element, the spec dictates that we follow the focus steps for the\n      // target. Rather than following the robust steps, simply attempt focus.\n      //\n      // @see https://html.spec.whatwg.org/#get-the-focusable-area\n      // @see https://developer.mozilla.org/en-US/docs/Web/API/HTMLOrForeignElement/focus\n      // @see https://html.spec.whatwg.org/#focusable-area\n      elSelected.focus();\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  /**\n   * Scrolls to an element using the native offset and the specified offset set on this scroller.\n   *\n   * The offset can be used when we know that there is a floating header and scrolling naively to an\n   * element (ex: `scrollIntoView`) leaves the element hidden behind the floating header.\n   */\n  private scrollToElement(el: HTMLElement): 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      if (!this.supportsScrolling()) {\n        return false;\n      }\n      // The `scrollRestoration` property could be on the `history` instance or its prototype.\n      const scrollRestorationDescriptor = getScrollRestorationProperty(this.window.history) ||\n          getScrollRestorationProperty(Object.getPrototypeOf(this.window.history));\n      // We can write to the `scrollRestoration` property if it is a writable data field or it has a\n      // setter function.\n      return !!scrollRestorationDescriptor &&\n          !!(scrollRestorationDescriptor.writable || scrollRestorationDescriptor.set);\n    } catch {\n      return false;\n    }\n  }\n\n  private supportsScrolling(): boolean {\n    try {\n      return !!this.window && !!this.window.scrollTo && 'pageXOffset' in this.window;\n    } catch {\n      return false;\n    }\n  }\n}\n\nfunction getScrollRestorationProperty(obj: any): PropertyDescriptor|undefined {\n  return Object.getOwnPropertyDescriptor(obj, 'scrollRestoration');\n}\n\nfunction findAnchorFromDocument(document: Document, target: string): HTMLElement|null {\n  const documentResult = document.getElementById(target) || document.getElementsByName(target)[0];\n\n  if (documentResult) {\n    return documentResult;\n  }\n\n  // `getElementById` and `getElementsByName` won't pierce through the shadow DOM so we\n  // have to traverse the DOM manually and do the lookup through the shadow roots.\n  if (typeof document.createTreeWalker === 'function' && document.body &&\n      typeof document.body.attachShadow === 'function') {\n    const treeWalker = document.createTreeWalker(document.body, NodeFilter.SHOW_ELEMENT);\n    let currentNode = treeWalker.currentNode as HTMLElement | null;\n\n    while (currentNode) {\n      const shadowRoot = currentNode.shadowRoot;\n\n      if (shadowRoot) {\n        // Note that `ShadowRoot` doesn't support `getElementsByName`\n        // so we have to fall back to `querySelector`.\n        const result =\n            shadowRoot.getElementById(target) || shadowRoot.querySelector(`[name=\"${target}\"]`);\n        if (result) {\n          return result;\n        }\n      }\n\n      currentNode = treeWalker.nextNode() as HTMLElement | null;\n    }\n  }\n\n  return null;\n}\n\n/**\n * Provides an empty implementation of the viewport scroller.\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] {\n    return [0, 0];\n  }\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"]}