@angular/flex-layout
Version:
Angular Flex-Layout =======
265 lines • 35.6 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 { Inject, Injectable } from '@angular/core';
import { mergeAlias } from '../add-alias';
import { MediaChange } from '../media-change';
import { LAYOUT_CONFIG } from '../tokens/library-config';
import { sortDescendingPriority } from '../utils/sort';
import { DOCUMENT } from '@angular/common';
import * as i0 from "@angular/core";
import * as i1 from "../breakpoints/break-point-registry";
const PRINT = 'print';
export const BREAKPOINT_PRINT = {
alias: PRINT,
mediaQuery: PRINT,
priority: 1000
};
/**
* PrintHook - Use to intercept print MediaQuery activations and force
* layouts to render with the specified print alias/breakpoint
*
* Used in MediaMarshaller and MediaObserver
*/
export class PrintHook {
constructor(breakpoints, layoutConfig, _document) {
this.breakpoints = breakpoints;
this.layoutConfig = layoutConfig;
this._document = _document;
// registeredBeforeAfterPrintHooks tracks if we registered the `beforeprint`
// and `afterprint` event listeners.
this.registeredBeforeAfterPrintHooks = false;
// isPrintingBeforeAfterEvent is used to track if we are printing from within
// a `beforeprint` event handler. This prevents the typical `stopPrinting`
// form `interceptEvents` so that printing is not stopped while the dialog
// is still open. This is an extension of the `isPrinting` property on
// browsers which support `beforeprint` and `afterprint` events.
this.isPrintingBeforeAfterEvent = false;
this.beforePrintEventListeners = [];
this.afterPrintEventListeners = [];
this.formerActivations = null;
// Is this service currently in print mode
this.isPrinting = false;
this.queue = new PrintQueue();
this.deactivations = [];
}
/** Add 'print' mediaQuery: to listen for matchMedia activations */
withPrintQuery(queries) {
return [...queries, PRINT];
}
/** Is the MediaChange event for any 'print' @media */
isPrintEvent(e) {
return e.mediaQuery.startsWith(PRINT);
}
/** What is the desired mqAlias to use while printing? */
get printAlias() {
return [...(this.layoutConfig.printWithBreakpoints ?? [])];
}
/** Lookup breakpoints associated with print aliases. */
get printBreakPoints() {
return this.printAlias
.map(alias => this.breakpoints.findByAlias(alias))
.filter(bp => bp !== null);
}
/** Lookup breakpoint associated with mediaQuery */
getEventBreakpoints({ mediaQuery }) {
const bp = this.breakpoints.findByQuery(mediaQuery);
const list = bp ? [...this.printBreakPoints, bp] : this.printBreakPoints;
return list.sort(sortDescendingPriority);
}
/** Update event with printAlias mediaQuery information */
updateEvent(event) {
let bp = this.breakpoints.findByQuery(event.mediaQuery);
if (this.isPrintEvent(event)) {
// Reset from 'print' to first (highest priority) print breakpoint
bp = this.getEventBreakpoints(event)[0];
event.mediaQuery = bp?.mediaQuery ?? '';
}
return mergeAlias(event, bp);
}
// registerBeforeAfterPrintHooks registers a `beforeprint` event hook so we can
// trigger print styles synchronously and apply proper layout styles.
// It is a noop if the hooks have already been registered or if the document's
// `defaultView` is not available.
registerBeforeAfterPrintHooks(target) {
// `defaultView` may be null when rendering on the server or in other contexts.
if (!this._document.defaultView || this.registeredBeforeAfterPrintHooks) {
return;
}
this.registeredBeforeAfterPrintHooks = true;
const beforePrintListener = () => {
// If we aren't already printing, start printing and update the styles as
// if there was a regular print `MediaChange`(from matchMedia).
if (!this.isPrinting) {
this.isPrintingBeforeAfterEvent = true;
this.startPrinting(target, this.getEventBreakpoints(new MediaChange(true, PRINT)));
target.updateStyles();
}
};
const afterPrintListener = () => {
// If we aren't already printing, start printing and update the styles as
// if there was a regular print `MediaChange`(from matchMedia).
this.isPrintingBeforeAfterEvent = false;
if (this.isPrinting) {
this.stopPrinting(target);
target.updateStyles();
}
};
// Could we have teardown logic to remove if there are no print listeners being used?
this._document.defaultView.addEventListener('beforeprint', beforePrintListener);
this._document.defaultView.addEventListener('afterprint', afterPrintListener);
this.beforePrintEventListeners.push(beforePrintListener);
this.afterPrintEventListeners.push(afterPrintListener);
}
/**
* Prepare RxJS tap operator with partial application
* @return pipeable tap predicate
*/
interceptEvents(target) {
return (event) => {
if (this.isPrintEvent(event)) {
if (event.matches && !this.isPrinting) {
this.startPrinting(target, this.getEventBreakpoints(event));
target.updateStyles();
}
else if (!event.matches && this.isPrinting && !this.isPrintingBeforeAfterEvent) {
this.stopPrinting(target);
target.updateStyles();
}
return;
}
this.collectActivations(target, event);
};
}
/** Stop mediaChange event propagation in event streams */
blockPropagation() {
return (event) => {
return !(this.isPrinting || this.isPrintEvent(event));
};
}
/**
* Save current activateBreakpoints (for later restore)
* and substitute only the printAlias breakpoint
*/
startPrinting(target, bpList) {
this.isPrinting = true;
this.formerActivations = target.activatedBreakpoints;
target.activatedBreakpoints = this.queue.addPrintBreakpoints(bpList);
}
/** For any print de-activations, reset the entire print queue */
stopPrinting(target) {
target.activatedBreakpoints = this.deactivations;
this.deactivations = [];
this.formerActivations = null;
this.queue.clear();
this.isPrinting = false;
}
/**
* To restore pre-Print Activations, we must capture the proper
* list of breakpoint activations BEFORE print starts. OnBeforePrint()
* is supported; so 'print' mediaQuery activations are used as a fallback
* in browsers without `beforeprint` support.
*
* > But activated breakpoints are deactivated BEFORE 'print' activation.
*
* Let's capture all de-activations using the following logic:
*
* When not printing:
* - clear cache when activating non-print breakpoint
* - update cache (and sort) when deactivating
*
* When printing:
* - sort and save when starting print
* - restore as activatedTargets and clear when stop printing
*/
collectActivations(target, event) {
if (!this.isPrinting || this.isPrintingBeforeAfterEvent) {
if (!this.isPrintingBeforeAfterEvent) {
// Only clear deactivations if we aren't printing from a `beforeprint` event.
// Otherwise, this will clear before `stopPrinting()` is called to restore
// the pre-Print Activations.
this.deactivations = [];
return;
}
if (!event.matches) {
const bp = this.breakpoints.findByQuery(event.mediaQuery);
// Deactivating a breakpoint
if (bp) {
const hasFormerBp = this.formerActivations && this.formerActivations.includes(bp);
const wasActivated = !this.formerActivations && target.activatedBreakpoints.includes(bp);
const shouldDeactivate = hasFormerBp || wasActivated;
if (shouldDeactivate) {
this.deactivations.push(bp);
this.deactivations.sort(sortDescendingPriority);
}
}
}
}
}
/** Teardown logic for the service. */
ngOnDestroy() {
if (this._document.defaultView) {
this.beforePrintEventListeners.forEach(l => this._document.defaultView.removeEventListener('beforeprint', l));
this.afterPrintEventListeners.forEach(l => this._document.defaultView.removeEventListener('afterprint', l));
}
}
}
PrintHook.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "15.0.2", ngImport: i0, type: PrintHook, deps: [{ token: i1.BreakPointRegistry }, { token: LAYOUT_CONFIG }, { token: DOCUMENT }], target: i0.ɵɵFactoryTarget.Injectable });
PrintHook.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "15.0.2", ngImport: i0, type: PrintHook, providedIn: 'root' });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "15.0.2", ngImport: i0, type: PrintHook, decorators: [{
type: Injectable,
args: [{ providedIn: 'root' }]
}], ctorParameters: function () { return [{ type: i1.BreakPointRegistry }, { type: undefined, decorators: [{
type: Inject,
args: [LAYOUT_CONFIG]
}] }, { type: undefined, decorators: [{
type: Inject,
args: [DOCUMENT]
}] }]; } });
// ************************************************************************
// Internal Utility class 'PrintQueue'
// ************************************************************************
/**
* Utility class to manage print breakpoints + activatedBreakpoints
* with correct sorting WHILE printing
*/
class PrintQueue {
constructor() {
/** Sorted queue with prioritized print breakpoints */
this.printBreakpoints = [];
}
addPrintBreakpoints(bpList) {
bpList.push(BREAKPOINT_PRINT);
bpList.sort(sortDescendingPriority);
bpList.forEach(bp => this.addBreakpoint(bp));
return this.printBreakpoints;
}
/** Add Print breakpoint to queue */
addBreakpoint(bp) {
if (!!bp) {
const bpInList = this.printBreakpoints.find(it => it.mediaQuery === bp.mediaQuery);
if (bpInList === undefined) {
// If this is a `printAlias` breakpoint, then append. If a true 'print' breakpoint,
// register as highest priority in the queue
this.printBreakpoints = isPrintBreakPoint(bp) ? [bp, ...this.printBreakpoints]
: [...this.printBreakpoints, bp];
}
}
}
/** Restore original activated breakpoints and clear internal caches */
clear() {
this.printBreakpoints = [];
}
}
// ************************************************************************
// Internal Utility methods
// ************************************************************************
/** Only support intercept queueing if the Breakpoint is a print @media query */
function isPrintBreakPoint(bp) {
return bp?.mediaQuery.startsWith(PRINT) ?? false;
}
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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 {Inject, Injectable, OnDestroy} from '@angular/core';\n\nimport {mergeAlias} from '../add-alias';\nimport {MediaChange} from '../media-change';\nimport {BreakPoint} from '../breakpoints/break-point';\nimport {LAYOUT_CONFIG, LayoutConfigOptions} from '../tokens/library-config';\nimport {BreakPointRegistry, OptionalBreakPoint} from '../breakpoints/break-point-registry';\nimport {sortDescendingPriority} from '../utils/sort';\nimport {DOCUMENT} from '@angular/common';\n\n/**\n * Interface to apply PrintHook to call anonymous `target.updateStyles()`\n */\nexport interface HookTarget {\n  activatedBreakpoints: BreakPoint[];\n  updateStyles(): void;\n}\n\nconst PRINT = 'print';\nexport const BREAKPOINT_PRINT = {\n  alias: PRINT,\n  mediaQuery: PRINT,\n  priority: 1000\n};\n\n/**\n * PrintHook - Use to intercept print MediaQuery activations and force\n *             layouts to render with the specified print alias/breakpoint\n *\n * Used in MediaMarshaller and MediaObserver\n */\n@Injectable({providedIn: 'root'})\nexport class PrintHook implements OnDestroy {\n  constructor(\n      protected breakpoints: BreakPointRegistry,\n      @Inject(LAYOUT_CONFIG) protected layoutConfig: LayoutConfigOptions,\n      @Inject(DOCUMENT) protected _document: any) {\n  }\n\n  /** Add 'print' mediaQuery: to listen for matchMedia activations */\n  withPrintQuery(queries: string[]): string[] {\n    return [...queries, PRINT];\n  }\n\n  /** Is the MediaChange event for any 'print' @media */\n  isPrintEvent(e: MediaChange): boolean {\n    return e.mediaQuery.startsWith(PRINT);\n  }\n\n  /** What is the desired mqAlias to use while printing? */\n  get printAlias(): string[] {\n    return [...(this.layoutConfig.printWithBreakpoints ?? [])];\n  }\n\n  /** Lookup breakpoints associated with print aliases. */\n  get printBreakPoints(): BreakPoint[] {\n    return this.printAlias\n        .map(alias => this.breakpoints.findByAlias(alias))\n        .filter(bp => bp !== null) as BreakPoint[];\n  }\n\n  /** Lookup breakpoint associated with mediaQuery */\n  getEventBreakpoints({mediaQuery}: MediaChange): BreakPoint[] {\n    const bp = this.breakpoints.findByQuery(mediaQuery);\n    const list = bp ? [...this.printBreakPoints, bp] : this.printBreakPoints;\n\n    return list.sort(sortDescendingPriority);\n  }\n\n  /** Update event with printAlias mediaQuery information */\n  updateEvent(event: MediaChange): MediaChange {\n    let bp: OptionalBreakPoint = this.breakpoints.findByQuery(event.mediaQuery);\n\n    if (this.isPrintEvent(event)) {\n      // Reset from 'print' to first (highest priority) print breakpoint\n      bp = this.getEventBreakpoints(event)[0];\n      event.mediaQuery = bp?.mediaQuery ?? '';\n    }\n\n    return mergeAlias(event, bp);\n  }\n\n\n  // registeredBeforeAfterPrintHooks tracks if we registered the `beforeprint`\n  //  and `afterprint` event listeners.\n  private registeredBeforeAfterPrintHooks = false;\n\n  // isPrintingBeforeAfterEvent is used to track if we are printing from within\n  // a `beforeprint` event handler. This prevents the typical `stopPrinting`\n  // form `interceptEvents` so that printing is not stopped while the dialog\n  // is still open. This is an extension of the `isPrinting` property on\n  // browsers which support `beforeprint` and `afterprint` events.\n  private isPrintingBeforeAfterEvent = false;\n\n  private beforePrintEventListeners: Function[] = [];\n  private afterPrintEventListeners: Function[] = [];\n\n  private formerActivations: Array<BreakPoint> | null = null;\n\n  // registerBeforeAfterPrintHooks registers a `beforeprint` event hook so we can\n  // trigger print styles synchronously and apply proper layout styles.\n  // It is a noop if the hooks have already been registered or if the document's\n  // `defaultView` is not available.\n  registerBeforeAfterPrintHooks(target: HookTarget) {\n    // `defaultView` may be null when rendering on the server or in other contexts.\n    if (!this._document.defaultView || this.registeredBeforeAfterPrintHooks) {\n      return;\n    }\n\n    this.registeredBeforeAfterPrintHooks = true;\n\n    const beforePrintListener = () => {\n      // If we aren't already printing, start printing and update the styles as\n      // if there was a regular print `MediaChange`(from matchMedia).\n      if (!this.isPrinting) {\n        this.isPrintingBeforeAfterEvent = true;\n        this.startPrinting(target, this.getEventBreakpoints(new MediaChange(true, PRINT)));\n        target.updateStyles();\n      }\n    };\n\n    const afterPrintListener = () => {\n      // If we aren't already printing, start printing and update the styles as\n      // if there was a regular print `MediaChange`(from matchMedia).\n      this.isPrintingBeforeAfterEvent = false;\n      if (this.isPrinting) {\n        this.stopPrinting(target);\n        target.updateStyles();\n      }\n    };\n\n    // Could we have teardown logic to remove if there are no print listeners being used?\n    this._document.defaultView.addEventListener('beforeprint', beforePrintListener);\n    this._document.defaultView.addEventListener('afterprint', afterPrintListener);\n\n    this.beforePrintEventListeners.push(beforePrintListener);\n    this.afterPrintEventListeners.push(afterPrintListener);\n  }\n\n  /**\n   * Prepare RxJS tap operator with partial application\n   * @return pipeable tap predicate\n   */\n  interceptEvents(target: HookTarget) {\n    return (event: MediaChange) => {\n      if (this.isPrintEvent(event)) {\n        if (event.matches && !this.isPrinting) {\n          this.startPrinting(target, this.getEventBreakpoints(event));\n          target.updateStyles();\n        } else if (!event.matches && this.isPrinting && !this.isPrintingBeforeAfterEvent) {\n          this.stopPrinting(target);\n          target.updateStyles();\n        }\n\n        return;\n      }\n\n      this.collectActivations(target, event);\n    };\n  }\n\n  /** Stop mediaChange event propagation in event streams */\n  blockPropagation() {\n    return (event: MediaChange): boolean => {\n      return !(this.isPrinting || this.isPrintEvent(event));\n    };\n  }\n\n  /**\n   * Save current activateBreakpoints (for later restore)\n   * and substitute only the printAlias breakpoint\n   */\n  protected startPrinting(target: HookTarget, bpList: OptionalBreakPoint[]) {\n    this.isPrinting = true;\n    this.formerActivations = target.activatedBreakpoints;\n    target.activatedBreakpoints = this.queue.addPrintBreakpoints(bpList);\n  }\n\n  /** For any print de-activations, reset the entire print queue */\n  protected stopPrinting(target: HookTarget) {\n    target.activatedBreakpoints = this.deactivations;\n    this.deactivations = [];\n    this.formerActivations = null;\n    this.queue.clear();\n    this.isPrinting = false;\n  }\n\n  /**\n   * To restore pre-Print Activations, we must capture the proper\n   * list of breakpoint activations BEFORE print starts. OnBeforePrint()\n   * is supported; so 'print' mediaQuery activations are used as a fallback\n   * in browsers without `beforeprint` support.\n   *\n   * >  But activated breakpoints are deactivated BEFORE 'print' activation.\n   *\n   * Let's capture all de-activations using the following logic:\n   *\n   *  When not printing:\n   *    - clear cache when activating non-print breakpoint\n   *    - update cache (and sort) when deactivating\n   *\n   *  When printing:\n   *    - sort and save when starting print\n   *    - restore as activatedTargets and clear when stop printing\n   */\n  collectActivations(target: HookTarget, event: MediaChange) {\n    if (!this.isPrinting || this.isPrintingBeforeAfterEvent) {\n      if (!this.isPrintingBeforeAfterEvent) {\n        // Only clear deactivations if we aren't printing from a `beforeprint` event.\n        // Otherwise, this will clear before `stopPrinting()` is called to restore\n        // the pre-Print Activations.\n        this.deactivations = [];\n\n        return;\n      }\n\n      if (!event.matches) {\n        const bp = this.breakpoints.findByQuery(event.mediaQuery);\n        // Deactivating a breakpoint\n        if (bp) {\n          const hasFormerBp = this.formerActivations && this.formerActivations.includes(bp);\n          const wasActivated = !this.formerActivations && target.activatedBreakpoints.includes(bp);\n          const shouldDeactivate = hasFormerBp || wasActivated;\n          if (shouldDeactivate) {\n            this.deactivations.push(bp);\n            this.deactivations.sort(sortDescendingPriority);\n          }\n        }\n      }\n    }\n  }\n\n  /** Teardown logic for the service. */\n  ngOnDestroy() {\n    if (this._document.defaultView) {\n      this.beforePrintEventListeners.forEach(l => this._document.defaultView.removeEventListener('beforeprint', l));\n      this.afterPrintEventListeners.forEach(l => this._document.defaultView.removeEventListener('afterprint', l));\n    }\n  }\n\n  // Is this service currently in print mode\n  private isPrinting = false;\n  private queue = new PrintQueue();\n  private deactivations: BreakPoint[] = [];\n}\n\n// ************************************************************************\n// Internal Utility class 'PrintQueue'\n// ************************************************************************\n\n/**\n * Utility class to manage print breakpoints + activatedBreakpoints\n * with correct sorting WHILE printing\n */\nclass PrintQueue {\n  /** Sorted queue with prioritized print breakpoints */\n  printBreakpoints: BreakPoint[] = [];\n\n  addPrintBreakpoints(bpList: OptionalBreakPoint[]): BreakPoint[] {\n    bpList.push(BREAKPOINT_PRINT);\n    bpList.sort(sortDescendingPriority);\n    bpList.forEach(bp => this.addBreakpoint(bp));\n\n    return this.printBreakpoints;\n  }\n\n  /** Add Print breakpoint to queue */\n  addBreakpoint(bp: OptionalBreakPoint) {\n    if (!!bp) {\n      const bpInList = this.printBreakpoints.find(it => it.mediaQuery === bp.mediaQuery);\n\n      if (bpInList === undefined) {\n        // If this is a `printAlias` breakpoint, then append. If a true 'print' breakpoint,\n        // register as highest priority in the queue\n        this.printBreakpoints = isPrintBreakPoint(bp) ? [bp, ...this.printBreakpoints]\n            : [...this.printBreakpoints, bp];\n      }\n    }\n  }\n\n  /** Restore original activated breakpoints and clear internal caches */\n  clear() {\n    this.printBreakpoints = [];\n  }\n}\n\n// ************************************************************************\n// Internal Utility methods\n// ************************************************************************\n\n/** Only support intercept queueing if the Breakpoint is a print @media query */\nfunction isPrintBreakPoint(bp: OptionalBreakPoint): boolean {\n  return bp?.mediaQuery.startsWith(PRINT) ?? false;\n}\n"]}