@blox/material
Version:
Material Components for Angular
141 lines • 21.3 kB
JavaScript
import { ContentChildren, EventEmitter, Directive, ElementRef, HostBinding, Output, HostListener, Inject } from '@angular/core';
import { DOCUMENT } from '@angular/common';
import { Subject } from 'rxjs';
import { MDCTabBarFoundation } from '@material/tab-bar';
import { MdcTabScrollerDirective } from './mdc.tab.scroller.directive';
import { takeUntil } from 'rxjs/operators';
/**
* Directive for a tab bar. This directive must have an `mdcTabScroller` as only child.
*/
export class MdcTabBarDirective {
constructor(_el, doc) {
this._el = _el;
/** @internal */
this._cls = true;
/** @internal */
this._role = 'tablist';
this.onDestroy$ = new Subject();
this.onTabsChange$ = new Subject();
/**
* Event emitted when the active tab changes.
*/
this.tabChange = new EventEmitter();
this._adapter = {
scrollTo: (scrollX) => this._scroller._foundation.scrollTo(scrollX),
incrementScroll: (scrollXIncrement) => this._scroller._foundation.incrementScroll(scrollXIncrement),
getScrollPosition: () => this._scroller._foundation.getScrollPosition(),
getScrollContentWidth: () => this._scroller._getScrollContentWidth(),
getOffsetWidth: () => this._el.nativeElement.offsetWidth,
isRTL: () => getComputedStyle(this._el.nativeElement).getPropertyValue('direction') === 'rtl',
setActiveTab: (index) => this._foundation.activateTab(index),
activateTabAtIndex: (index, clientRect) => this._tabs.toArray()[index]._activate(index, clientRect),
deactivateTabAtIndex: (index) => this._tabs.toArray()[index]._deactivate(),
focusTabAtIndex: (index) => this._tabs.toArray()[index]._focus(),
getTabIndicatorClientRectAtIndex: (index) => this._tabs.toArray()[index]._computeIndicatorClientRect(),
getTabDimensionsAtIndex: (index) => this._tabs.toArray()[index]._computeDimensions(),
getPreviousActiveTabIndex: () => this._tabs.toArray().findIndex(e => e.isActive()),
getFocusedTabIndex: () => this._tabs.map(t => t._root.nativeElement).indexOf(this.document.activeElement),
getIndexOfTabById: () => -1,
getTabListLength: () => this._tabs.length,
notifyTabActivated: (tabIndex) => this.tabChange.emit({ tab: this._tabs.toArray()[tabIndex], tabIndex })
};
this._subscriptions = [];
this._foundation = null;
this.document = doc;
}
ngAfterContentInit() {
let scrollersObservable$ = this._scrollers.changes.pipe(takeUntil(this.onDestroy$));
const tabChangeInit = () => {
if (this._tabs) {
this._tabs.changes.pipe(takeUntil(scrollersObservable$), takeUntil(this.onDestroy$)).subscribe(() => {
this.onTabsChange$.next();
});
}
};
scrollersObservable$.subscribe(() => {
this.onTabsChange$.next();
tabChangeInit();
});
tabChangeInit();
this.onTabsChange$.pipe(takeUntil(this.onDestroy$)).subscribe(() => {
this.destroyFoundation();
if (this._tabs)
this.initFoundation();
});
if (this._tabs)
this.initFoundation();
}
ngOnDestroy() {
this.onTabsChange$.complete();
this.onDestroy$.next();
this.onDestroy$.complete();
this.destroyFoundation();
}
initFoundation() {
this._foundation = new MDCTabBarFoundation(this._adapter);
this._foundation.init();
this._listenTabSelected();
}
destroyFoundation() {
this._unlistenTabSelected();
let destroy = this._foundation != null;
if (destroy) {
this._foundation.destroy();
}
this._foundation = null;
return destroy;
}
_listenTabSelected() {
var _a;
this._unlistenTabSelected();
this._subscriptions = new Array();
(_a = this._tabs) === null || _a === void 0 ? void 0 : _a.forEach(tab => {
this._subscriptions.push(tab.activationRequest$.subscribe(activated => {
if (activated)
this._setActive(tab);
}));
});
}
_unlistenTabSelected() {
this._subscriptions.forEach(sub => sub.unsubscribe());
this._subscriptions = [];
}
_setActive(tab) {
if (this._foundation && this._tabs) {
let index = this._tabs.toArray().indexOf(tab);
// This is what foundation.handleTabInteraction would do, but more accessible, without
// the need for assigned tabIds:
if (index >= 0)
this._adapter.setActiveTab(index);
}
}
/** @internal */
_handleInteraction(event) {
if (this._foundation)
this._foundation.handleKeyDown(event);
}
get _scroller() {
return this._scrollers && this._scrollers.length > 0 ? this._scrollers.first : null;
}
get _tabs() {
return this._scroller ? this._scroller._tabs : null;
}
}
MdcTabBarDirective.decorators = [
{ type: Directive, args: [{
selector: '[mdcTabBar]'
},] }
];
MdcTabBarDirective.ctorParameters = () => [
{ type: ElementRef },
{ type: undefined, decorators: [{ type: Inject, args: [DOCUMENT,] }] }
];
MdcTabBarDirective.propDecorators = {
_cls: [{ type: HostBinding, args: ['class.mdc-tab-bar',] }],
_role: [{ type: HostBinding, args: ['attr.role',] }],
_scrollers: [{ type: ContentChildren, args: [MdcTabScrollerDirective,] }],
tabChange: [{ type: Output }],
_handleInteraction: [{ type: HostListener, args: ['keydown', ['$event'],] }]
};
export const TAB_BAR_DIRECTIVES = [MdcTabBarDirective];
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{ ContentChildren, EventEmitter, QueryList, Directive, ElementRef, HostBinding, Output, HostListener,\n    AfterContentInit, OnDestroy, Inject } from '@angular/core';\nimport { DOCUMENT } from '@angular/common';\nimport { Subject, Subscription } from 'rxjs';\nimport { MDCTabBarFoundation, MDCTabBarAdapter } from '@material/tab-bar';\nimport { AbstractMdcTabDirective, MdcTabChange } from './mdc.tab.directive';\nimport { MdcTabScrollerDirective } from './mdc.tab.scroller.directive';\nimport { takeUntil } from 'rxjs/operators';\n\n/**\n * Directive for a tab bar. This directive must have an `mdcTabScroller` as only child.\n */\n@Directive({\n    selector: '[mdcTabBar]'\n})\nexport class MdcTabBarDirective implements AfterContentInit, OnDestroy {\n    /** @internal */\n    @HostBinding('class.mdc-tab-bar') readonly _cls = true;\n    private document: Document;\n    /** @internal */\n    @HostBinding('attr.role') _role = 'tablist';\n    private onDestroy$: Subject<any> = new Subject();\n    private onTabsChange$: Subject<any> = new Subject();\n    /** @internal */\n    @ContentChildren(MdcTabScrollerDirective) _scrollers?: QueryList<MdcTabScrollerDirective>;\n    /**\n     * Event emitted when the active tab changes.\n     */\n    @Output() readonly tabChange: EventEmitter<MdcTabChange> = new EventEmitter();\n    private _adapter: MDCTabBarAdapter = {\n        scrollTo: (scrollX) => this._scroller!._foundation!.scrollTo(scrollX),\n        incrementScroll: (scrollXIncrement) => this._scroller!._foundation!.incrementScroll(scrollXIncrement),\n        getScrollPosition: () => this._scroller!._foundation!.getScrollPosition(),\n        getScrollContentWidth: () => this._scroller!._getScrollContentWidth(),\n        getOffsetWidth: () => (this._el.nativeElement as HTMLElement).offsetWidth,\n        isRTL: () => getComputedStyle(this._el.nativeElement).getPropertyValue('direction') === 'rtl',\n        setActiveTab: (index) => this._foundation!.activateTab(index),\n        activateTabAtIndex: (index, clientRect) => this._tabs!.toArray()[index]._activate(index, clientRect),\n        deactivateTabAtIndex: (index) => this._tabs!.toArray()[index]._deactivate(),\n        focusTabAtIndex: (index) => this._tabs!.toArray()[index]._focus(),\n        getTabIndicatorClientRectAtIndex: (index) => this._tabs!.toArray()[index]._computeIndicatorClientRect()!,\n        getTabDimensionsAtIndex: (index) => this._tabs!.toArray()[index]._computeDimensions()!,\n        getPreviousActiveTabIndex: () => this._tabs!.toArray().findIndex(e => e.isActive()),\n        getFocusedTabIndex: () => this._tabs!.map(t => t._root.nativeElement).indexOf(this.document.activeElement),\n        getIndexOfTabById: () => -1, // we're not using the id's, and nothing should call getIndexOfTabById\n        getTabListLength: () => this._tabs!.length,\n        notifyTabActivated: (tabIndex) => this.tabChange.emit({tab: this._tabs!.toArray()[tabIndex], tabIndex})\n    };\n    private _subscriptions: Subscription[] = [];\n    private _foundation: MDCTabBarFoundation | null = null;\n\n    constructor(public _el: ElementRef, @Inject(DOCUMENT) doc: any) {\n        this.document = doc as Document;\n    }\n\n    ngAfterContentInit() {\n        let scrollersObservable$ = this._scrollers!.changes.pipe(takeUntil(this.onDestroy$));\n        const tabChangeInit = () => {\n            if (this._tabs) {\n                this._tabs.changes.pipe(\n                    takeUntil(scrollersObservable$), takeUntil(this.onDestroy$)\n                ).subscribe(() => {\n                    this.onTabsChange$.next();\n                });\n            }\n        }\n        scrollersObservable$.subscribe(() => {\n            this.onTabsChange$.next();\n            tabChangeInit();\n        });\n        tabChangeInit();\n\n        this.onTabsChange$.pipe(\n            takeUntil(this.onDestroy$)\n        ).subscribe(() => {\n            this.destroyFoundation();\n            if (this._tabs)\n                this.initFoundation();\n        });\n        if (this._tabs)\n            this.initFoundation();\n    }\n\n    ngOnDestroy() {\n        this.onTabsChange$.complete();\n        this.onDestroy$.next(); this.onDestroy$.complete();\n        this.destroyFoundation();\n    }\n\n    private initFoundation() {\n        this._foundation = new MDCTabBarFoundation(this._adapter);\n        this._foundation.init();\n        this._listenTabSelected();\n    }\n\n    private destroyFoundation() {\n        this._unlistenTabSelected();\n        let destroy = this._foundation != null;\n        if (destroy) {\n            this._foundation!.destroy();\n        }\n        this._foundation = null;\n        return destroy;\n    }\n\n    private _listenTabSelected() {\n        this._unlistenTabSelected();\n        this._subscriptions = new Array<Subscription>();\n        this._tabs?.forEach(tab => {\n            this._subscriptions!.push(tab.activationRequest$.subscribe(activated => {\n                if (activated)\n                    this._setActive(tab);\n            }));\n        });\n    }\n\n    private _unlistenTabSelected() {\n        this._subscriptions.forEach(sub => sub.unsubscribe());\n        this._subscriptions = [];\n    }\n\n    private _setActive(tab: AbstractMdcTabDirective) {\n        if (this._foundation && this._tabs) {\n            let index = this._tabs.toArray().indexOf(tab);\n            // This is what foundation.handleTabInteraction would do, but more accessible, without\n            // the need for assigned tabIds:\n            if (index >= 0)\n                this._adapter.setActiveTab(index);\n        }\n    }\n\n    /** @internal */\n    @HostListener('keydown', ['$event']) _handleInteraction(event: KeyboardEvent) {\n        if (this._foundation)\n            this._foundation.handleKeyDown(event);\n    }\n\n    private get _scroller() {\n        return this._scrollers && this._scrollers.length > 0 ? this._scrollers.first : null;\n    }\n\n    private get _tabs() {\n        return this._scroller ? this._scroller._tabs : null;\n    }\n}\n\nexport const TAB_BAR_DIRECTIVES = [MdcTabBarDirective];\n"]}