@dbg-riskit/angular-view
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JavaScript
import { Injectable } from '@angular/core';
import { CONTENT_TYPE } from '@dbg-riskit/common';
import { BehaviorSubject } from 'rxjs';
import { filter } from 'rxjs/operators';
import * as i0 from "@angular/core";
import * as i1 from "@dbg-riskit/common";
/**
* Class instances emitted [to observers] for each mql notification
*/
export class MediaChange {
constructor(mediaQuery = 'all') {
this.mediaQuery = mediaQuery;
}
}
/**
* MediaMonitor configures listeners to mediaQuery changes and publishes an Observable facade to
* convert mediaQuery change callbacks to subscriber notifications. These notifications will be
* performed within the ng Zone to trigger change detections and component updates.
*
* NOTE: both mediaQuery activations and de-activations are announced in notifications
*/
export class MatchMedia {
constructor(ngZone, logger) {
this.ngZone = ngZone;
this.logger = logger;
this._registry = new Map();
this._source = new BehaviorSubject(new MediaChange());
this._observable$ = this._source.asObservable();
}
/**
* For the specified mediaQuery?
*/
isActive(mediaQuery) {
if (this._registry.has(mediaQuery)) {
const mql = this._registry.get(mediaQuery);
return mql.matches;
}
return false;
}
/**
* External observers can watch for all (or a specific) mql changes.
* Typically used by the MediaQueryAdaptor; optionally available to components
* who wish to use the MediaMonitor as mediaMonitor$ observable service.
*
* NOTE: if a mediaQuery is not specified, then ALL mediaQuery activations will
* be announced.
*/
observe(mediaQuery) {
this.registerQuery(mediaQuery);
return this._observable$.pipe(filter((change) => {
return mediaQuery ? (change.mediaQuery === mediaQuery) : true;
}));
}
/**
* Based on the BreakPointRegistry provider, register internal listeners for each unique
* mediaQuery. Each listener emits specific MediaChange data to observers
*/
registerQuery(mediaQuery) {
const list = normalizeQuery(mediaQuery);
if (list.length > 0) {
prepareQueryCSS(list, this.logger);
list.forEach((query) => {
let mql = this._registry.get(query);
const onMQLEvent = () => {
this.ngZone.run(() => {
const change = new MediaChange(query);
this._source.next(change);
});
};
if (!mql) {
mql = this._buildMQL(query);
mql.addEventListener('change', onMQLEvent);
this._registry.set(query, mql);
}
if (mql.matches) {
onMQLEvent(); // Announce activate range for initial subscribers
}
});
}
}
/**
* Call window.matchMedia() to build a MediaQueryList; which
* supports 0..n listeners for activation/deactivation
*/
_buildMQL(query) {
const canListen = !!window.matchMedia('all').addEventListener;
return canListen ? window.matchMedia(query) : {
matches: query === 'all' || query === '',
media: query,
addListener: () => undefined,
addEventListener: () => undefined,
removeListener: () => undefined,
removeEventListener: () => undefined,
dispatchEvent: () => false,
onchange: () => undefined
};
}
}
MatchMedia.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "13.2.6", ngImport: i0, type: MatchMedia, deps: [{ token: i0.NgZone }, { token: i1.Logger }], target: i0.ɵɵFactoryTarget.Injectable });
MatchMedia.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "13.2.6", ngImport: i0, type: MatchMedia });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "13.2.6", ngImport: i0, type: MatchMedia, decorators: [{
type: Injectable
}], ctorParameters: function () { return [{ type: i0.NgZone }, { type: i1.Logger }]; } });
/**
* Private global registry for all dynamically-created, injected style tags
* @see prepare(query)
*/
const ALL_STYLES = {};
/**
* For Webkit engines that only trigger the MediaQueryList Listener
* when there is at least one CSS selector for the respective media query.
*
* @param mediaQueries string[] The mediaQueries used to create a faux CSS selector
*
*/
function prepareQueryCSS(mediaQueries, logger) {
const list = mediaQueries.filter((it) => !ALL_STYLES[it]);
if (list.length > 0) {
const query = list.join(', ');
try {
const style = document.createElement('style');
style.setAttribute('type', CONTENT_TYPE.TEXT_CSS);
// Older IEs
if (!style.styleSheet) {
const cssText = `/*
@angular/flex-layout - workaround for possible browser quirk with mediaQuery listeners
see http://bit.ly/2sd4HMP
*/
@media ${query} {.fx-query-test{ }}`;
style.appendChild(document.createTextNode(cssText));
}
document.getElementsByTagName('head')[0].appendChild(style);
// Store in private global registry
list.forEach((mq) => ALL_STYLES[mq] = style);
}
catch (e) {
logger.error(e);
}
}
}
/**
* Always convert to unique list of queries; for iteration in ::registerQuery()
*/
function normalizeQuery(mediaQuery) {
return (typeof mediaQuery === 'undefined') ? [] :
(typeof mediaQuery === 'string') ? [mediaQuery] : unique(mediaQuery);
}
/**
* Filter duplicate mediaQueries in the list
*/
function unique(list) {
const seen = {};
return list.filter((item) => {
return seen.hasOwnProperty(item) ? false : (seen[item] = true);
});
}
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These notifications will be\n * performed within the ng Zone to trigger change detections and component updates.\n *\n * NOTE: both mediaQuery activations and de-activations are announced in notifications\n */\n@Injectable()\nexport class MatchMedia {\n    protected readonly _registry: Map<string, MediaQueryList>;\n    protected readonly _source: BehaviorSubject<MediaChange>;\n    protected readonly _observable$: Observable<MediaChange>;\n\n    public constructor(protected readonly ngZone: NgZone,\n                       private readonly logger: Logger) {\n        this._registry = new Map<string, MediaQueryList>();\n        this._source = new BehaviorSubject<MediaChange>(new MediaChange());\n        this._observable$ = this._source.asObservable();\n    }\n\n    /**\n     * For the specified mediaQuery?\n     */\n    public isActive(mediaQuery: string): boolean {\n        if (this._registry.has(mediaQuery)) {\n            const mql = this._registry.get(mediaQuery);\n            return mql!.matches;\n        }\n        return false;\n    }\n\n    /**\n     * External observers can watch for all (or a specific) mql changes.\n     * Typically used by the MediaQueryAdaptor; optionally available to components\n     * who wish to use the MediaMonitor as mediaMonitor$ observable service.\n     *\n     * NOTE: if a mediaQuery is not specified, then ALL mediaQuery activations will\n     *       be announced.\n     */\n    public observe(mediaQuery?: string): Observable<MediaChange> {\n        this.registerQuery(mediaQuery);\n\n        return this._observable$.pipe(\n            filter((change: MediaChange) => {\n                return mediaQuery ? (change.mediaQuery === mediaQuery) : true;\n            })\n        );\n    }\n\n    /**\n     * Based on the BreakPointRegistry provider, register internal listeners for each unique\n     * mediaQuery. Each listener emits specific MediaChange data to observers\n     */\n    private registerQuery(mediaQuery?: string | string[]) {\n        const list = normalizeQuery(mediaQuery);\n\n        if (list.length > 0) {\n            prepareQueryCSS(list, this.logger);\n\n            list.forEach((query) => {\n                let mql = this._registry.get(query);\n                const onMQLEvent = () => {\n                    this.ngZone.run(() => {\n                        const change = new MediaChange(query);\n                        this._source.next(change);\n                    });\n                };\n\n                if (!mql) {\n                    mql = this._buildMQL(query);\n                    mql.addEventListener('change', onMQLEvent);\n                    this._registry.set(query, mql);\n                }\n\n                if (mql.matches) {\n                    onMQLEvent();  // Announce activate range for initial subscribers\n                }\n            });\n        }\n    }\n\n    /**\n     * Call window.matchMedia() to build a MediaQueryList; which\n     * supports 0..n listeners for activation/deactivation\n     */\n    protected _buildMQL(query: string): MediaQueryList {\n        const canListen = !!window.matchMedia('all').addEventListener;\n        return canListen ? window.matchMedia(query) : {\n            matches            : query === 'all' || query === '',\n            media              : query,\n            addListener        : () => undefined,\n            addEventListener   : () => undefined,\n            removeListener     : () => undefined,\n            removeEventListener: () => undefined,\n            dispatchEvent      : () => false,\n            onchange           : () => undefined\n        } as MediaQueryList;\n    }\n}\n\n/**\n * Private global registry for all dynamically-created, injected style tags\n * @see prepare(query)\n */\nconst ALL_STYLES: { [key: string]: HTMLStyleElement } = {};\n\n/**\n * For Webkit engines that only trigger the MediaQueryList Listener\n * when there is at least one CSS selector for the respective media query.\n *\n * @param mediaQueries string[] The mediaQueries used to create a faux CSS selector\n *\n */\nfunction prepareQueryCSS(mediaQueries: string[], logger: Logger) {\n    const list = mediaQueries.filter((it) => !ALL_STYLES[it]);\n    if (list.length > 0) {\n        const query = list.join(', ');\n        try {\n            const style: HTMLStyleElement = document.createElement('style');\n\n            style.setAttribute('type', CONTENT_TYPE.TEXT_CSS);\n            // Older IEs\n            if (!(style as any).styleSheet) {\n                const cssText = `/*\n  @angular/flex-layout - workaround for possible browser quirk with mediaQuery listeners\n  see http://bit.ly/2sd4HMP\n*/\n@media ${query} {.fx-query-test{ }}`;\n                style.appendChild(document.createTextNode(cssText));\n            }\n\n            document.getElementsByTagName('head')[0].appendChild(style);\n\n            // Store in private global registry\n            list.forEach((mq) => ALL_STYLES[mq] = style);\n\n        } catch (e) {\n            logger.error(e);\n        }\n    }\n}\n\n/**\n * Always convert to unique list of queries; for iteration in ::registerQuery()\n */\nfunction normalizeQuery(mediaQuery?: string | string[]): string[] {\n    return (typeof mediaQuery === 'undefined') ? [] :\n        (typeof mediaQuery === 'string') ? [mediaQuery] : unique(mediaQuery);\n}\n\n/**\n * Filter duplicate mediaQueries in the list\n */\nfunction unique(list: string[]): string[] {\n    const seen: { [key: string]: boolean } = {};\n    return list.filter((item) => {\n        return seen.hasOwnProperty(item) ? false : (seen[item] = true);\n    });\n}\n"]}