@angular/common/esm2020/src/viewport_scroller.mjs

Angular - commonly needed directives and services

/**
 * @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
 */
export class ViewportScroller {
}
// De-sugared tree-shakable injection
// See #23917
/** @nocollapse */
ViewportScroller.ɵprov = ɵɵdefineInjectable({
    token: ViewportScroller,
    providedIn: 'root',
    factory: () => new BrowserViewportScroller(ɵɵinject(DOCUMENT), window)
});
/**
 * 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 &&
        (document.body.createShadowRoot || document.body.attachShadow)) {
        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) { }
}
//# sourceMappingURL=data:application/json;base64,{"version":3,"file":"viewport_scroller.js","sourceRoot":"","sources":["../../../../../../packages/common/src/viewport_scroller.ts"],"names":[],"mappings":"AAAA;;;;;;GAMG;AAEH,OAAO,EAAC,kBAAkB,EAAE,QAAQ,EAAC,MAAM,eAAe,CAAC;AAE3D,OAAO,EAAC,QAAQ,EAAC,MAAM,cAAc,CAAC;AAItC;;;;GAIG;AACH,MAAM,OAAgB,gBAAgB;;AACpC,qCAAqC;AACrC,aAAa;AACb,kBAAkB;AACX,sBAAK,GAA6B,kBAAkB,CAAC;IAC1D,KAAK,EAAE,gBAAgB;IACvB,UAAU,EAAE,MAAM;IAClB,OAAO,EAAE,GAAG,EAAE,CAAC,IAAI,uBAAuB,CAAC,QAAQ,CAAC,QAAQ,CAAC,EAAE,MAAM,CAAC;CACvE,CAAC,CAAC;AAoCL;;GAEG;AACH,MAAM,OAAO,uBAAuB;IAGlC,YAAoB,QAAkB,EAAU,MAAc;QAA1C,aAAQ,GAAR,QAAQ,CAAU;QAAU,WAAM,GAAN,MAAM,CAAQ;QAFtD,WAAM,GAA2B,GAAG,EAAE,CAAC,CAAC,CAAC,EAAE,CAAC,CAAC,CAAC;IAEW,CAAC;IAElE;;;;;OAKG;IACH,SAAS,CAAC,MAAiD;QACzD,IAAI,KAAK,CAAC,OAAO,CAAC,MAAM,CAAC,EAAE;YACzB,IAAI,CAAC,MAAM,GAAG,GAAG,EAAE,CAAC,MAAM,CAAC;SAC5B;aAAM;YACL,IAAI,CAAC,MAAM,GAAG,MAAM,CAAC;SACtB;IACH,CAAC;IAED;;;OAGG;IACH,iBAAiB;QACf,IAAI,IAAI,CAAC,iBAAiB,EAAE,EAAE;YAC5B,OAAO,CAAC,IAAI,CAAC,MAAM,CAAC,WAAW,EAAE,IAAI,CAAC,MAAM,CAAC,WAAW,CAAC,CAAC;SAC3D;aAAM;YACL,OAAO,CAAC,CAAC,EAAE,CAAC,CAAC,CAAC;SACf;IACH,CAAC;IAED;;;OAGG;IACH,gBAAgB,CAAC,QAA0B;QACzC,IAAI,IAAI,CAAC,iBAAiB,EAAE,EAAE;YAC5B,IAAI,CAAC,MAAM,CAAC,QAAQ,CAAC,QAAQ,CAAC,CAAC,CAAC,EAAE,QAAQ,CAAC,CAAC,CAAC,CAAC,CAAC;SAChD;IACH,CAAC;IAED;;;;;;;;;;OAUG;IACH,cAAc,CAAC,MAAc;QAC3B,IAAI,CAAC,IAAI,CAAC,iBAAiB,EAAE,EAAE;YAC7B,OAAO;SACR;QAED,MAAM,UAAU,GAAG,sBAAsB,CAAC,IAAI,CAAC,QAAQ,EAAE,MAAM,CAAC,CAAC;QAEjE,IAAI,UAAU,EAAE;YACd,IAAI,CAAC,eAAe,CAAC,UAAU,CAAC,CAAC;YACjC,2FAA2F;YAC3F,wEAAwE;YACxE,EAAE;YACF,4DAA4D;YAC5D,mFAAmF;YACnF,oDAAoD;YACpD,UAAU,CAAC,KAAK,EAAE,CAAC;SACpB;IACH,CAAC;IAED;;OAEG;IACH,2BAA2B,CAAC,iBAAkC;QAC5D,IAAI,IAAI,CAAC,wBAAwB,EAAE,EAAE;YACnC,MAAM,OAAO,GAAG,IAAI,CAAC,MAAM,CAAC,OAAO,CAAC;YACpC,IAAI,OAAO,IAAI,OAAO,CAAC,iBAAiB,EAAE;gBACxC,OAAO,CAAC,iBAAiB,GAAG,iBAAiB,CAAC;aAC/C;SACF;IACH,CAAC;IAED;;;;;OAKG;IACK,eAAe,CAAC,EAAe;QACrC,MAAM,IAAI,GAAG,EAAE,CAAC,qBAAqB,EAAE,CAAC;QACxC,MAAM,IAAI,GAAG,IAAI,CAAC,IAAI,GAAG,IAAI,CAAC,MAAM,CAAC,WAAW,CAAC;QACjD,MAAM,GAAG,GAAG,IAAI,CAAC,GAAG,GAAG,IAAI,CAAC,MAAM,CAAC,WAAW,CAAC;QAC/C,MAAM,MAAM,GAAG,IAAI,CAAC,MAAM,EAAE,CAAC;QAC7B,IAAI,CAAC,MAAM,CAAC,QAAQ,CAAC,IAAI,GAAG,MAAM,CAAC,CAAC,CAAC,EAAE,GAAG,GAAG,MAAM,CAAC,CAAC,CAAC,CAAC,CAAC;IAC1D,CAAC;IAED;;;;;;;OAOG;IACK,wBAAwB;QAC9B,IAAI;YACF,IAAI,CAAC,IAAI,CAAC,iBAAiB,EAAE,EAAE;gBAC7B,OAAO,KAAK,CAAC;aACd;YACD,wFAAwF;YACxF,MAAM,2BAA2B,GAAG,4BAA4B,CAAC,IAAI,CAAC,MAAM,CAAC,OAAO,CAAC;gBACjF,4BAA4B,CAAC,MAAM,CAAC,cAAc,CAAC,IAAI,CAAC,MAAM,CAAC,OAAO,CAAC,CAAC,CAAC;YAC7E,8FAA8F;YAC9F,mBAAmB;YACnB,OAAO,CAAC,CAAC,2BAA2B;gBAChC,CAAC,CAAC,CAAC,2BAA2B,CAAC,QAAQ,IAAI,2BAA2B,CAAC,GAAG,CAAC,CAAC;SACjF;QAAC,MAAM;YACN,OAAO,KAAK,CAAC;SACd;IACH,CAAC;IAEO,iBAAiB;QACvB,IAAI;YACF,OAAO,CAAC,CAAC,IAAI,CAAC,MAAM,IAAI,CAAC,CAAC,IAAI,CAAC,MAAM,CAAC,QAAQ,IAAI,aAAa,IAAI,IAAI,CAAC,MAAM,CAAC;SAChF;QAAC,MAAM;YACN,OAAO,KAAK,CAAC;SACd;IACH,CAAC;CACF;AAED,SAAS,4BAA4B,CAAC,GAAQ;IAC5C,OAAO,MAAM,CAAC,wBAAwB,CAAC,GAAG,EAAE,mBAAmB,CAAC,CAAC;AACnE,CAAC;AAED,SAAS,sBAAsB,CAAC,QAAkB,EAAE,MAAc;IAChE,MAAM,cAAc,GAAG,QAAQ,CAAC,cAAc,CAAC,MAAM,CAAC,IAAI,QAAQ,CAAC,iBAAiB,CAAC,MAAM,CAAC,CAAC,CAAC,CAAC,CAAC;IAEhG,IAAI,cAAc,EAAE;QAClB,OAAO,cAAc,CAAC;KACvB;IAED,qFAAqF;IACrF,gFAAgF;IAChF,IAAI,OAAO,QAAQ,CAAC,gBAAgB,KAAK,UAAU,IAAI,QAAQ,CAAC,IAAI;QAChE,CAAE,QAAQ,CAAC,IAAY,CAAC,gBAAgB,IAAI,QAAQ,CAAC,IAAI,CAAC,YAAY,CAAC,EAAE;QAC3E,MAAM,UAAU,GAAG,QAAQ,CAAC,gBAAgB,CAAC,QAAQ,CAAC,IAAI,EAAE,UAAU,CAAC,YAAY,CAAC,CAAC;QACrF,IAAI,WAAW,GAAG,UAAU,CAAC,WAAiC,CAAC;QAE/D,OAAO,WAAW,EAAE;YAClB,MAAM,UAAU,GAAG,WAAW,CAAC,UAAU,CAAC;YAE1C,IAAI,UAAU,EAAE;gBACd,6DAA6D;gBAC7D,8CAA8C;gBAC9C,MAAM,MAAM,GACR,UAAU,CAAC,cAAc,CAAC,MAAM,CAAC,IAAI,UAAU,CAAC,aAAa,CAAC,UAAU,MAAM,IAAI,CAAC,CAAC;gBACxF,IAAI,MAAM,EAAE;oBACV,OAAO,MAAM,CAAC;iBACf;aACF;YAED,WAAW,GAAG,UAAU,CAAC,QAAQ,EAAwB,CAAC;SAC3D;KACF;IAED,OAAO,IAAI,CAAC;AACd,CAAC;AAED;;GAEG;AACH,MAAM,OAAO,oBAAoB;IAC/B;;OAEG;IACH,SAAS,CAAC,MAAiD,IAAS,CAAC;IAErE;;OAEG;IACH,iBAAiB;QACf,OAAO,CAAC,CAAC,EAAE,CAAC,CAAC,CAAC;IAChB,CAAC;IAED;;OAEG;IACH,gBAAgB,CAAC,QAA0B,IAAS,CAAC;IAErD;;OAEG;IACH,cAAc,CAAC,MAAc,IAAS,CAAC;IAEvC;;OAEG;IACH,2BAA2B,CAAC,iBAAkC,IAAS,CAAC;CACzE","sourcesContent":["/**\n * @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 {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 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      ((document.body as any).createShadowRoot || document.body.attachShadow)) {\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"]}