@angular/flex-layout
Version:
Angular Flex-Layout =======
317 lines • 40.1 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 { Injectable } from '@angular/core';
import { merge, Subject } from 'rxjs';
import { filter, tap } from 'rxjs/operators';
import { sortDescendingPriority } from '../utils/sort';
import { mergeAlias } from '../add-alias';
import * as i0 from "@angular/core";
import * as i1 from "../match-media/match-media";
import * as i2 from "../breakpoints/break-point-registry";
import * as i3 from "./print-hook";
/**
* MediaMarshaller - register responsive values from directives and
* trigger them based on media query events
*/
export class MediaMarshaller {
constructor(matchMedia, breakpoints, hook) {
this.matchMedia = matchMedia;
this.breakpoints = breakpoints;
this.hook = hook;
this._useFallbacks = true;
this._activatedBreakpoints = [];
this.elementMap = new Map();
this.elementKeyMap = new WeakMap();
this.watcherMap = new WeakMap(); // special triggers to update elements
this.updateMap = new WeakMap(); // callback functions to update styles
this.clearMap = new WeakMap(); // callback functions to clear styles
this.subject = new Subject();
this.observeActivations();
}
get activatedAlias() {
return this.activatedBreakpoints[0]?.alias ?? '';
}
set activatedBreakpoints(bps) {
this._activatedBreakpoints = [...bps];
}
get activatedBreakpoints() {
return [...this._activatedBreakpoints];
}
set useFallbacks(value) {
this._useFallbacks = value;
}
/**
* Update styles on breakpoint activates or deactivates
* @param mc
*/
onMediaChange(mc) {
const bp = this.findByQuery(mc.mediaQuery);
if (bp) {
mc = mergeAlias(mc, bp);
const bpIndex = this.activatedBreakpoints.indexOf(bp);
if (mc.matches && bpIndex === -1) {
this._activatedBreakpoints.push(bp);
this._activatedBreakpoints.sort(sortDescendingPriority);
this.updateStyles();
}
else if (!mc.matches && bpIndex !== -1) {
// Remove the breakpoint when it's deactivated
this._activatedBreakpoints.splice(bpIndex, 1);
this._activatedBreakpoints.sort(sortDescendingPriority);
this.updateStyles();
}
}
}
/**
* initialize the marshaller with necessary elements for delegation on an element
* @param element
* @param key
* @param updateFn optional callback so that custom bp directives don't have to re-provide this
* @param clearFn optional callback so that custom bp directives don't have to re-provide this
* @param extraTriggers other triggers to force style updates (e.g. layout, directionality, etc)
*/
init(element, key, updateFn, clearFn, extraTriggers = []) {
initBuilderMap(this.updateMap, element, key, updateFn);
initBuilderMap(this.clearMap, element, key, clearFn);
this.buildElementKeyMap(element, key);
this.watchExtraTriggers(element, key, extraTriggers);
}
/**
* get the value for an element and key and optionally a given breakpoint
* @param element
* @param key
* @param bp
*/
getValue(element, key, bp) {
const bpMap = this.elementMap.get(element);
if (bpMap) {
const values = bp !== undefined ? bpMap.get(bp) : this.getActivatedValues(bpMap, key);
if (values) {
return values.get(key);
}
}
return undefined;
}
/**
* whether the element has values for a given key
* @param element
* @param key
*/
hasValue(element, key) {
const bpMap = this.elementMap.get(element);
if (bpMap) {
const values = this.getActivatedValues(bpMap, key);
if (values) {
return values.get(key) !== undefined || false;
}
}
return false;
}
/**
* Set the value for an input on a directive
* @param element the element in question
* @param key the type of the directive (e.g. flex, layout-gap, etc)
* @param bp the breakpoint suffix (empty string = default)
* @param val the value for the breakpoint
*/
setValue(element, key, val, bp) {
let bpMap = this.elementMap.get(element);
if (!bpMap) {
bpMap = new Map().set(bp, new Map().set(key, val));
this.elementMap.set(element, bpMap);
}
else {
const values = (bpMap.get(bp) ?? new Map()).set(key, val);
bpMap.set(bp, values);
this.elementMap.set(element, bpMap);
}
const value = this.getValue(element, key);
if (value !== undefined) {
this.updateElement(element, key, value);
}
}
/** Track element value changes for a specific key */
trackValue(element, key) {
return this.subject
.asObservable()
.pipe(filter(v => v.element === element && v.key === key));
}
/** update all styles for all elements on the current breakpoint */
updateStyles() {
this.elementMap.forEach((bpMap, el) => {
const keyMap = new Set(this.elementKeyMap.get(el));
let valueMap = this.getActivatedValues(bpMap);
if (valueMap) {
valueMap.forEach((v, k) => {
this.updateElement(el, k, v);
keyMap.delete(k);
});
}
keyMap.forEach(k => {
valueMap = this.getActivatedValues(bpMap, k);
if (valueMap) {
const value = valueMap.get(k);
this.updateElement(el, k, value);
}
else {
this.clearElement(el, k);
}
});
});
}
/**
* clear the styles for a given element
* @param element
* @param key
*/
clearElement(element, key) {
const builders = this.clearMap.get(element);
if (builders) {
const clearFn = builders.get(key);
if (!!clearFn) {
clearFn();
this.subject.next({ element, key, value: '' });
}
}
}
/**
* update a given element with the activated values for a given key
* @param element
* @param key
* @param value
*/
updateElement(element, key, value) {
const builders = this.updateMap.get(element);
if (builders) {
const updateFn = builders.get(key);
if (!!updateFn) {
updateFn(value);
this.subject.next({ element, key, value });
}
}
}
/**
* release all references to a given element
* @param element
*/
releaseElement(element) {
const watcherMap = this.watcherMap.get(element);
if (watcherMap) {
watcherMap.forEach(s => s.unsubscribe());
this.watcherMap.delete(element);
}
const elementMap = this.elementMap.get(element);
if (elementMap) {
elementMap.forEach((_, s) => elementMap.delete(s));
this.elementMap.delete(element);
}
}
/**
* trigger an update for a given element and key (e.g. layout)
* @param element
* @param key
*/
triggerUpdate(element, key) {
const bpMap = this.elementMap.get(element);
if (bpMap) {
const valueMap = this.getActivatedValues(bpMap, key);
if (valueMap) {
if (key) {
this.updateElement(element, key, valueMap.get(key));
}
else {
valueMap.forEach((v, k) => this.updateElement(element, k, v));
}
}
}
}
/** Cross-reference for HTMLElement with directive key */
buildElementKeyMap(element, key) {
let keyMap = this.elementKeyMap.get(element);
if (!keyMap) {
keyMap = new Set();
this.elementKeyMap.set(element, keyMap);
}
keyMap.add(key);
}
/**
* Other triggers that should force style updates:
* - directionality
* - layout changes
* - mutationobserver updates
*/
watchExtraTriggers(element, key, triggers) {
if (triggers && triggers.length) {
let watchers = this.watcherMap.get(element);
if (!watchers) {
watchers = new Map();
this.watcherMap.set(element, watchers);
}
const subscription = watchers.get(key);
if (!subscription) {
const newSubscription = merge(...triggers).subscribe(() => {
const currentValue = this.getValue(element, key);
this.updateElement(element, key, currentValue);
});
watchers.set(key, newSubscription);
}
}
}
/** Breakpoint locator by mediaQuery */
findByQuery(query) {
return this.breakpoints.findByQuery(query);
}
/**
* get the fallback breakpoint for a given element, starting with the current breakpoint
* @param bpMap
* @param key
*/
getActivatedValues(bpMap, key) {
for (let i = 0; i < this.activatedBreakpoints.length; i++) {
const activatedBp = this.activatedBreakpoints[i];
const valueMap = bpMap.get(activatedBp.alias);
if (valueMap) {
if (key === undefined || (valueMap.has(key) && valueMap.get(key) != null)) {
return valueMap;
}
}
}
// On the server, we explicitly have an "all" section filled in to begin with.
// So we don't need to aggressively find a fallback if no explicit value exists.
if (!this._useFallbacks) {
return undefined;
}
const lastHope = bpMap.get('');
return (key === undefined || lastHope && lastHope.has(key)) ? lastHope : undefined;
}
/**
* Watch for mediaQuery breakpoint activations
*/
observeActivations() {
const queries = this.breakpoints.items.map(bp => bp.mediaQuery);
this.hook.registerBeforeAfterPrintHooks(this);
this.matchMedia
.observe(this.hook.withPrintQuery(queries))
.pipe(tap(this.hook.interceptEvents(this)), filter(this.hook.blockPropagation()))
.subscribe(this.onMediaChange.bind(this));
}
}
MediaMarshaller.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "15.0.2", ngImport: i0, type: MediaMarshaller, deps: [{ token: i1.MatchMedia }, { token: i2.BreakPointRegistry }, { token: i3.PrintHook }], target: i0.ɵɵFactoryTarget.Injectable });
MediaMarshaller.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "15.0.2", ngImport: i0, type: MediaMarshaller, providedIn: 'root' });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "15.0.2", ngImport: i0, type: MediaMarshaller, decorators: [{
type: Injectable,
args: [{ providedIn: 'root' }]
}], ctorParameters: function () { return [{ type: i1.MatchMedia }, { type: i2.BreakPointRegistry }, { type: i3.PrintHook }]; } });
function initBuilderMap(map, element, key, input) {
if (input !== undefined) {
const oldMap = map.get(element) ?? new Map();
oldMap.set(key, input);
map.set(element, oldMap);
}
}
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* @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 */\nimport {Injectable} from '@angular/core';\n\nimport {merge, Observable, Subject, Subscription} from 'rxjs';\nimport {filter, tap} from 'rxjs/operators';\n\nimport {BreakPoint} from '../breakpoints/break-point';\nimport {sortDescendingPriority} from '../utils/sort';\nimport {BreakPointRegistry} from '../breakpoints/break-point-registry';\nimport {MatchMedia} from '../match-media/match-media';\nimport {MediaChange} from '../media-change';\n\nimport {PrintHook, HookTarget} from './print-hook';\nimport {mergeAlias} from '../add-alias';\n\ntype ClearCallback = () => void;\ntype UpdateCallback = (val: any) => void;\ntype Builder = UpdateCallback | ClearCallback;\n\ntype ValueMap = Map<string, string>;\ntype BreakpointMap = Map<string, ValueMap>;\ntype ElementMap = Map<HTMLElement, BreakpointMap>;\ntype ElementKeyMap = WeakMap<HTMLElement, Set<string>>;\ntype SubscriptionMap = Map<string, Subscription>;\ntype WatcherMap = WeakMap<HTMLElement, SubscriptionMap>;\ntype BuilderMap = WeakMap<HTMLElement, Map<string, Builder>>;\n\nexport interface ElementMatcher {\n  element: HTMLElement;\n  key: string;\n  value: any;\n}\n\n/**\n * MediaMarshaller - register responsive values from directives and\n *                   trigger them based on media query events\n */\n@Injectable({providedIn: 'root'})\nexport class MediaMarshaller {\n  private _useFallbacks = true;\n  private _activatedBreakpoints: BreakPoint[] = [];\n  private elementMap: ElementMap = new Map();\n  private elementKeyMap: ElementKeyMap = new WeakMap();\n  private watcherMap: WatcherMap = new WeakMap();     // special triggers to update elements\n  private updateMap: BuilderMap = new WeakMap();      // callback functions to update styles\n  private clearMap: BuilderMap = new WeakMap();       // callback functions to clear styles\n\n  private subject: Subject<ElementMatcher> = new Subject();\n\n  get activatedAlias(): string {\n    return this.activatedBreakpoints[0]?.alias ?? '';\n  }\n\n  set activatedBreakpoints(bps: BreakPoint[]) {\n    this._activatedBreakpoints = [...bps];\n  }\n\n  get activatedBreakpoints(): BreakPoint[] {\n    return [...this._activatedBreakpoints];\n  }\n\n  set useFallbacks(value: boolean) {\n    this._useFallbacks = value;\n  }\n\n  constructor(protected matchMedia: MatchMedia,\n              protected breakpoints: BreakPointRegistry,\n              protected hook: PrintHook) {\n    this.observeActivations();\n  }\n\n  /**\n   * Update styles on breakpoint activates or deactivates\n   * @param mc\n   */\n  onMediaChange(mc: MediaChange) {\n    const bp: BreakPoint | null = this.findByQuery(mc.mediaQuery);\n\n    if (bp) {\n      mc = mergeAlias(mc, bp);\n\n      const bpIndex = this.activatedBreakpoints.indexOf(bp);\n\n      if (mc.matches && bpIndex === -1) {\n        this._activatedBreakpoints.push(bp);\n        this._activatedBreakpoints.sort(sortDescendingPriority);\n\n        this.updateStyles();\n      } else if (!mc.matches && bpIndex !== -1) {\n        // Remove the breakpoint when it's deactivated\n        this._activatedBreakpoints.splice(bpIndex, 1);\n        this._activatedBreakpoints.sort(sortDescendingPriority);\n\n        this.updateStyles();\n      }\n    }\n  }\n\n  /**\n   * initialize the marshaller with necessary elements for delegation on an element\n   * @param element\n   * @param key\n   * @param updateFn optional callback so that custom bp directives don't have to re-provide this\n   * @param clearFn optional callback so that custom bp directives don't have to re-provide this\n   * @param extraTriggers other triggers to force style updates (e.g. layout, directionality, etc)\n   */\n  init(element: HTMLElement,\n       key: string,\n       updateFn?: UpdateCallback,\n       clearFn?: ClearCallback,\n       extraTriggers: Observable<any>[] = []): void {\n\n    initBuilderMap(this.updateMap, element, key, updateFn);\n    initBuilderMap(this.clearMap, element, key, clearFn);\n\n    this.buildElementKeyMap(element, key);\n    this.watchExtraTriggers(element, key, extraTriggers);\n  }\n\n  /**\n   * get the value for an element and key and optionally a given breakpoint\n   * @param element\n   * @param key\n   * @param bp\n   */\n  getValue(element: HTMLElement, key: string, bp?: string): any {\n    const bpMap = this.elementMap.get(element);\n    if (bpMap) {\n      const values = bp !== undefined ? bpMap.get(bp) : this.getActivatedValues(bpMap, key);\n      if (values) {\n        return values.get(key);\n      }\n    }\n    return undefined;\n  }\n\n  /**\n   * whether the element has values for a given key\n   * @param element\n   * @param key\n   */\n  hasValue(element: HTMLElement, key: string): boolean {\n    const bpMap = this.elementMap.get(element);\n    if (bpMap) {\n      const values = this.getActivatedValues(bpMap, key);\n      if (values) {\n        return values.get(key) !== undefined || false;\n      }\n    }\n    return false;\n  }\n\n  /**\n   * Set the value for an input on a directive\n   * @param element the element in question\n   * @param key the type of the directive (e.g. flex, layout-gap, etc)\n   * @param bp the breakpoint suffix (empty string = default)\n   * @param val the value for the breakpoint\n   */\n  setValue(element: HTMLElement, key: string, val: any, bp: string): void {\n    let bpMap: BreakpointMap | undefined = this.elementMap.get(element);\n    if (!bpMap) {\n      bpMap = new Map().set(bp, new Map().set(key, val));\n      this.elementMap.set(element, bpMap);\n    } else {\n      const values = (bpMap.get(bp) ?? new Map()).set(key, val);\n      bpMap.set(bp, values);\n      this.elementMap.set(element, bpMap);\n    }\n    const value = this.getValue(element, key);\n    if (value !== undefined) {\n      this.updateElement(element, key, value);\n    }\n  }\n\n  /** Track element value changes for a specific key */\n  trackValue(element: HTMLElement, key: string): Observable<ElementMatcher> {\n    return this.subject\n        .asObservable()\n        .pipe(filter(v => v.element === element && v.key === key));\n  }\n\n  /** update all styles for all elements on the current breakpoint */\n  updateStyles(): void {\n    this.elementMap.forEach((bpMap, el) => {\n      const keyMap = new Set(this.elementKeyMap.get(el)!);\n      let valueMap = this.getActivatedValues(bpMap);\n\n      if (valueMap) {\n        valueMap.forEach((v, k) => {\n          this.updateElement(el, k, v);\n          keyMap.delete(k);\n        });\n      }\n\n      keyMap.forEach(k => {\n        valueMap = this.getActivatedValues(bpMap, k);\n        if (valueMap) {\n          const value = valueMap.get(k);\n          this.updateElement(el, k, value);\n        } else {\n          this.clearElement(el, k);\n        }\n      });\n    });\n  }\n\n  /**\n   * clear the styles for a given element\n   * @param element\n   * @param key\n   */\n  clearElement(element: HTMLElement, key: string): void {\n    const builders = this.clearMap.get(element);\n\n    if (builders) {\n      const clearFn: ClearCallback = builders.get(key) as ClearCallback;\n      if (!!clearFn) {\n        clearFn();\n        this.subject.next({element, key, value: ''});\n      }\n    }\n  }\n\n  /**\n   * update a given element with the activated values for a given key\n   * @param element\n   * @param key\n   * @param value\n   */\n  updateElement(element: HTMLElement, key: string, value: any): void {\n    const builders = this.updateMap.get(element);\n    if (builders) {\n      const updateFn: UpdateCallback = builders.get(key) as UpdateCallback;\n      if (!!updateFn) {\n        updateFn(value);\n        this.subject.next({element, key, value});\n      }\n    }\n  }\n\n  /**\n   * release all references to a given element\n   * @param element\n   */\n  releaseElement(element: HTMLElement): void {\n    const watcherMap = this.watcherMap.get(element);\n    if (watcherMap) {\n      watcherMap.forEach(s => s.unsubscribe());\n      this.watcherMap.delete(element);\n    }\n    const elementMap = this.elementMap.get(element);\n    if (elementMap) {\n      elementMap.forEach((_, s) => elementMap.delete(s));\n      this.elementMap.delete(element);\n    }\n  }\n\n  /**\n   * trigger an update for a given element and key (e.g. layout)\n   * @param element\n   * @param key\n   */\n  triggerUpdate(element: HTMLElement, key?: string): void {\n    const bpMap = this.elementMap.get(element);\n    if (bpMap) {\n      const valueMap = this.getActivatedValues(bpMap, key);\n      if (valueMap) {\n        if (key) {\n          this.updateElement(element, key, valueMap.get(key));\n        } else {\n          valueMap.forEach((v, k) => this.updateElement(element, k, v));\n        }\n      }\n    }\n  }\n\n  /** Cross-reference for HTMLElement with directive key */\n  private buildElementKeyMap(element: HTMLElement, key: string) {\n    let keyMap = this.elementKeyMap.get(element);\n    if (!keyMap) {\n      keyMap = new Set();\n      this.elementKeyMap.set(element, keyMap);\n    }\n    keyMap.add(key);\n  }\n\n  /**\n   * Other triggers that should force style updates:\n   * - directionality\n   * - layout changes\n   * - mutationobserver updates\n   */\n  private watchExtraTriggers(element: HTMLElement,\n                             key: string,\n                             triggers: Observable<any>[]) {\n    if (triggers && triggers.length) {\n      let watchers = this.watcherMap.get(element);\n      if (!watchers) {\n        watchers = new Map();\n        this.watcherMap.set(element, watchers);\n      }\n      const subscription = watchers.get(key);\n      if (!subscription) {\n        const newSubscription = merge(...triggers).subscribe(() => {\n          const currentValue = this.getValue(element, key);\n          this.updateElement(element, key, currentValue);\n        });\n        watchers.set(key, newSubscription);\n      }\n    }\n  }\n\n  /** Breakpoint locator by mediaQuery */\n  private findByQuery(query: string) {\n    return this.breakpoints.findByQuery(query);\n  }\n\n  /**\n   * get the fallback breakpoint for a given element, starting with the current breakpoint\n   * @param bpMap\n   * @param key\n   */\n  private getActivatedValues(bpMap: BreakpointMap, key?: string): ValueMap | undefined {\n    for (let i = 0; i < this.activatedBreakpoints.length; i++) {\n      const activatedBp = this.activatedBreakpoints[i];\n      const valueMap = bpMap.get(activatedBp.alias);\n\n      if (valueMap) {\n        if (key === undefined || (valueMap.has(key) && valueMap.get(key) != null)) {\n          return valueMap;\n        }\n      }\n    }\n\n    // On the server, we explicitly have an \"all\" section filled in to begin with.\n    // So we don't need to aggressively find a fallback if no explicit value exists.\n    if (!this._useFallbacks) {\n      return undefined;\n    }\n\n    const lastHope = bpMap.get('');\n    return (key === undefined || lastHope && lastHope.has(key)) ? lastHope : undefined;\n  }\n\n  /**\n   * Watch for mediaQuery breakpoint activations\n   */\n  private observeActivations() {\n    const queries = this.breakpoints.items.map(bp => bp.mediaQuery);\n\n    this.hook.registerBeforeAfterPrintHooks(this);\n    this.matchMedia\n        .observe(this.hook.withPrintQuery(queries))\n        .pipe(\n            tap(this.hook.interceptEvents(this)),\n            filter(this.hook.blockPropagation())\n        )\n        .subscribe(this.onMediaChange.bind(this));\n  }\n\n}\n\nfunction initBuilderMap(map: BuilderMap,\n                        element: HTMLElement,\n                        key: string,\n                        input?: Builder): void {\n  if (input !== undefined) {\n    const oldMap = map.get(element) ?? new Map();\n    oldMap.set(key, input);\n    map.set(element, oldMap);\n  }\n}\n\n"]}