ng-zorro-antd
Version:
An enterprise-class UI components based on Ant Design and Angular
475 lines • 43.5 kB
JavaScript
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
*/
import * as tslib_1 from "tslib";
/** code from https://github.com/angular/material2 */
import { Directionality } from '@angular/cdk/bidi';
import { ChangeDetectionStrategy, ChangeDetectorRef, Component, ContentChildren, ElementRef, EventEmitter, Input, NgZone, Optional, Output, QueryList, Renderer2, TemplateRef, ViewChild, ViewEncapsulation } from '@angular/core';
import { fromEvent, merge, of as observableOf } from 'rxjs';
import { auditTime, startWith } from 'rxjs/operators';
import { InputBoolean } from '../core/util/convert';
import { NzTabLabelDirective } from './nz-tab-label.directive';
import { NzTabsInkBarDirective } from './nz-tabs-ink-bar.directive';
/** @type {?} */
const EXAGGERATED_OVERSCROLL = 64;
export class NzTabsNavComponent {
/**
* @param {?} elementRef
* @param {?} ngZone
* @param {?} renderer
* @param {?} cdr
* @param {?} dir
*/
constructor(elementRef, ngZone, renderer, cdr, dir) {
this.elementRef = elementRef;
this.ngZone = ngZone;
this.renderer = renderer;
this.cdr = cdr;
this.dir = dir;
this._tabPositionMode = 'horizontal';
this._scrollDistance = 0;
this._selectedIndex = 0;
this.showPaginationControls = false;
this.disableScrollAfter = true;
this.disableScrollBefore = true;
this.selectedIndexChanged = false;
this.realignInkBar = null;
this.nzOnNextClick = new EventEmitter();
this.nzOnPrevClick = new EventEmitter();
this.nzAnimated = true;
this.nzHideBar = false;
this.nzShowPagination = true;
this.nzType = 'line';
}
/**
* @param {?} value
* @return {?}
*/
set nzPositionMode(value) {
this._tabPositionMode = value;
this.alignInkBarToSelectedTab();
if (this.nzShowPagination) {
Promise.resolve().then((/**
* @return {?}
*/
() => {
this.updatePagination();
}));
}
}
/**
* @return {?}
*/
get nzPositionMode() {
return this._tabPositionMode;
}
/**
* @param {?} value
* @return {?}
*/
set selectedIndex(value) {
this.selectedIndexChanged = this._selectedIndex !== value;
this._selectedIndex = value;
}
/**
* @return {?}
*/
get selectedIndex() {
return this._selectedIndex;
}
/**
* @return {?}
*/
onContentChanges() {
/** @type {?} */
const textContent = this.elementRef.nativeElement.textContent;
// We need to diff the text content of the header, because the MutationObserver callback
// will fire even if the text content didn't change which is inefficient and is prone
// to infinite loops if a poorly constructed expression is passed in (see #14249).
if (textContent !== this.currentTextContent) {
this.ngZone.run((/**
* @return {?}
*/
() => {
if (this.nzShowPagination) {
this.updatePagination();
}
this.alignInkBarToSelectedTab();
this.cdr.markForCheck();
}));
}
}
/**
* @param {?} scrollDir
* @return {?}
*/
scrollHeader(scrollDir) {
if (scrollDir === 'before' && !this.disableScrollBefore) {
this.nzOnPrevClick.emit();
}
else if (scrollDir === 'after' && !this.disableScrollAfter) {
this.nzOnNextClick.emit();
}
// Move the scroll distance one-third the length of the tab list's viewport.
this.scrollDistance += (scrollDir === 'before' ? -1 : 1) * this.viewWidthHeightPix / 3;
}
/**
* @return {?}
*/
ngAfterContentChecked() {
if (this.tabLabelCount !== this.listOfNzTabLabelDirective.length) {
if (this.nzShowPagination) {
this.updatePagination();
}
this.tabLabelCount = this.listOfNzTabLabelDirective.length;
this.cdr.markForCheck();
}
if (this.selectedIndexChanged) {
this.scrollToLabel(this._selectedIndex);
if (this.nzShowPagination) {
this.checkScrollingControls();
}
this.alignInkBarToSelectedTab();
this.selectedIndexChanged = false;
this.cdr.markForCheck();
}
if (this.scrollDistanceChanged) {
if (this.nzShowPagination) {
this.updateTabScrollPosition();
}
this.scrollDistanceChanged = false;
this.cdr.markForCheck();
}
}
/**
* @return {?}
*/
ngAfterContentInit() {
this.realignInkBar = this.ngZone.runOutsideAngular((/**
* @return {?}
*/
() => {
/** @type {?} */
const dirChange = this.dir ? this.dir.change : observableOf(null);
/** @type {?} */
const resize = typeof window !== 'undefined' ?
fromEvent(window, 'resize').pipe(auditTime(10)) :
observableOf(null);
return merge(dirChange, resize).pipe(startWith(null)).subscribe((/**
* @return {?}
*/
() => {
if (this.nzShowPagination) {
this.updatePagination();
}
this.alignInkBarToSelectedTab();
}));
}));
}
/**
* @return {?}
*/
updateTabScrollPosition() {
/** @type {?} */
const scrollDistance = this.scrollDistance;
if (this.nzPositionMode === 'horizontal') {
/** @type {?} */
const translateX = this.getLayoutDirection() === 'ltr' ? -scrollDistance : scrollDistance;
this.renderer.setStyle(this.navListElement.nativeElement, 'transform', `translate3d(${translateX}px, 0, 0)`);
}
else {
this.renderer.setStyle(this.navListElement.nativeElement, 'transform', `translate3d(0,${-scrollDistance}px, 0)`);
}
}
/**
* @return {?}
*/
updatePagination() {
this.checkPaginationEnabled();
this.checkScrollingControls();
this.updateTabScrollPosition();
}
/**
* @return {?}
*/
checkPaginationEnabled() {
/** @type {?} */
const isEnabled = this.tabListScrollWidthHeightPix > this.tabListScrollOffSetWidthHeight;
if (!isEnabled) {
this.scrollDistance = 0;
}
if (isEnabled !== this.showPaginationControls) {
this.cdr.markForCheck();
}
this.showPaginationControls = isEnabled;
}
/**
* @param {?} labelIndex
* @return {?}
*/
scrollToLabel(labelIndex) {
/** @type {?} */
const selectedLabel = this.listOfNzTabLabelDirective
? this.listOfNzTabLabelDirective.toArray()[labelIndex]
: null;
if (selectedLabel) {
// The view length is the visible width of the tab labels.
/** @type {?} */
let labelBeforePos;
/** @type {?} */
let labelAfterPos;
if (this.nzPositionMode === 'horizontal') {
if (this.getLayoutDirection() === 'ltr') {
labelBeforePos = selectedLabel.getOffsetLeft();
labelAfterPos = labelBeforePos + selectedLabel.getOffsetWidth();
}
else {
labelAfterPos = this.navListElement.nativeElement.offsetWidth - selectedLabel.getOffsetLeft();
labelBeforePos = labelAfterPos - selectedLabel.getOffsetWidth();
}
}
else {
labelBeforePos = selectedLabel.getOffsetTop();
labelAfterPos = labelBeforePos + selectedLabel.getOffsetHeight();
}
/** @type {?} */
const beforeVisiblePos = this.scrollDistance;
/** @type {?} */
const afterVisiblePos = this.scrollDistance + this.viewWidthHeightPix;
if (labelBeforePos < beforeVisiblePos) {
// Scroll header to move label to the before direction
this.scrollDistance -= beforeVisiblePos - labelBeforePos + EXAGGERATED_OVERSCROLL;
}
else if (labelAfterPos > afterVisiblePos) {
// Scroll header to move label to the after direction
this.scrollDistance += labelAfterPos - afterVisiblePos + EXAGGERATED_OVERSCROLL;
}
}
}
/**
* @return {?}
*/
checkScrollingControls() {
// Check if the pagination arrows should be activated.
this.disableScrollBefore = this.scrollDistance === 0;
this.disableScrollAfter = this.scrollDistance === this.getMaxScrollDistance();
this.cdr.markForCheck();
}
/**
* Determines what is the maximum length in pixels that can be set for the scroll distance. This
* is equal to the difference in width between the tab list container and tab header container.
*
* This is an expensive call that forces a layout reflow to compute box and scroll metrics and
* should be called sparingly.
* @return {?}
*/
getMaxScrollDistance() {
return (this.tabListScrollWidthHeightPix - this.viewWidthHeightPix) || 0;
}
/**
* Sets the distance in pixels that the tab header should be transformed in the X-axis.
* @param {?} v
* @return {?}
*/
set scrollDistance(v) {
this._scrollDistance = Math.max(0, Math.min(this.getMaxScrollDistance(), v));
// Mark that the scroll distance has changed so that after the view is checked, the CSS
// transformation can move the header.
this.scrollDistanceChanged = true;
this.checkScrollingControls();
}
/**
* @return {?}
*/
get scrollDistance() {
return this._scrollDistance;
}
/**
* @return {?}
*/
get viewWidthHeightPix() {
/** @type {?} */
let PAGINATION_PIX = 0;
if (this.showPaginationControls) {
PAGINATION_PIX = 64;
}
if (this.nzPositionMode === 'horizontal') {
return this.navContainerElement.nativeElement.offsetWidth - PAGINATION_PIX;
}
else {
return this.navContainerElement.nativeElement.offsetHeight - PAGINATION_PIX;
}
}
/**
* @return {?}
*/
get tabListScrollWidthHeightPix() {
if (this.nzPositionMode === 'horizontal') {
return this.navListElement.nativeElement.scrollWidth;
}
else {
return this.navListElement.nativeElement.scrollHeight;
}
}
/**
* @return {?}
*/
get tabListScrollOffSetWidthHeight() {
if (this.nzPositionMode === 'horizontal') {
return this.scrollListElement.nativeElement.offsetWidth;
}
else {
return this.elementRef.nativeElement.offsetHeight;
}
}
/**
* @return {?}
*/
getLayoutDirection() {
return this.dir && this.dir.value === 'rtl' ? 'rtl' : 'ltr';
}
/**
* @return {?}
*/
alignInkBarToSelectedTab() {
if (this.nzType === 'line') {
/** @type {?} */
const selectedLabelWrapper = this.listOfNzTabLabelDirective && this.listOfNzTabLabelDirective.length
? this.listOfNzTabLabelDirective.toArray()[this.selectedIndex].elementRef.nativeElement
: null;
if (this.nzTabsInkBarDirective) {
this.nzTabsInkBarDirective.alignToElement(selectedLabelWrapper);
}
}
}
}
NzTabsNavComponent.decorators = [
{ type: Component, args: [{
selector: '[nz-tabs-nav]',
preserveWhitespaces: false,
changeDetection: ChangeDetectionStrategy.OnPush,
encapsulation: ViewEncapsulation.None,
template: "<div style=\"float:right;\" *ngIf=\"nzTabBarExtraContent\" class=\"ant-tabs-extra-content\">\n <ng-template [ngTemplateOutlet]=\"nzTabBarExtraContent\"></ng-template>\n</div>\n<div class=\"ant-tabs-nav-container\"\n [class.ant-tabs-nav-container-scrolling]=\"showPaginationControls\"\n #navContainerElement>\n <span class=\"ant-tabs-tab-prev\"\n (click)=\"scrollHeader('before')\"\n [class.ant-tabs-tab-btn-disabled]=\"disableScrollBefore\"\n [class.ant-tabs-tab-arrow-show]=\"showPaginationControls\">\n <span class=\"ant-tabs-tab-prev-icon\">\n <i nz-icon [type]=\"nzPositionMode === 'horizontal' ? 'left' : 'up'\" class=\"ant-tabs-tab-prev-icon-target\"></i>\n </span>\n </span>\n <span class=\"ant-tabs-tab-next\"\n (click)=\"scrollHeader('after')\"\n [class.ant-tabs-tab-btn-disabled]=\"disableScrollAfter\"\n [class.ant-tabs-tab-arrow-show]=\"showPaginationControls\">\n <span class=\"ant-tabs-tab-next-icon\">\n <i nz-icon [type]=\"nzPositionMode === 'horizontal' ? 'right' : 'down'\" class=\"ant-tabs-tab-next-icon-target\"></i>\n </span>\n </span>\n <div class=\"ant-tabs-nav-wrap\">\n <div class=\"ant-tabs-nav-scroll\" #scrollListElement>\n <div class=\"ant-tabs-nav\"\n [class.ant-tabs-nav-animated]=\"nzAnimated\"\n #navListElement\n (cdkObserveContent)=\"onContentChanges()\">\n <div>\n <ng-content></ng-content>\n </div>\n <div nz-tabs-ink-bar [hidden]=\"nzHideBar\" [nzAnimated]=\"nzAnimated\" [nzPositionMode]=\"nzPositionMode\" style=\"display: block;\"></div>\n </div>\n </div>\n </div>\n</div>"
}] }
];
/** @nocollapse */
NzTabsNavComponent.ctorParameters = () => [
{ type: ElementRef },
{ type: NgZone },
{ type: Renderer2 },
{ type: ChangeDetectorRef },
{ type: Directionality, decorators: [{ type: Optional }] }
];
NzTabsNavComponent.propDecorators = {
listOfNzTabLabelDirective: [{ type: ContentChildren, args: [NzTabLabelDirective,] }],
nzTabsInkBarDirective: [{ type: ViewChild, args: [NzTabsInkBarDirective,] }],
navContainerElement: [{ type: ViewChild, args: ['navContainerElement',] }],
navListElement: [{ type: ViewChild, args: ['navListElement',] }],
scrollListElement: [{ type: ViewChild, args: ['scrollListElement',] }],
nzOnNextClick: [{ type: Output }],
nzOnPrevClick: [{ type: Output }],
nzTabBarExtraContent: [{ type: Input }],
nzAnimated: [{ type: Input }],
nzHideBar: [{ type: Input }],
nzShowPagination: [{ type: Input }],
nzType: [{ type: Input }],
nzPositionMode: [{ type: Input }],
selectedIndex: [{ type: Input }]
};
tslib_1.__decorate([
InputBoolean(),
tslib_1.__metadata("design:type", Object)
], NzTabsNavComponent.prototype, "nzAnimated", void 0);
tslib_1.__decorate([
InputBoolean(),
tslib_1.__metadata("design:type", Object)
], NzTabsNavComponent.prototype, "nzHideBar", void 0);
tslib_1.__decorate([
InputBoolean(),
tslib_1.__metadata("design:type", Object)
], NzTabsNavComponent.prototype, "nzShowPagination", void 0);
if (false) {
/**
* @type {?}
* @private
*/
NzTabsNavComponent.prototype._tabPositionMode;
/**
* @type {?}
* @private
*/
NzTabsNavComponent.prototype._scrollDistance;
/**
* @type {?}
* @private
*/
NzTabsNavComponent.prototype._selectedIndex;
/**
* Cached text content of the header.
* @type {?}
* @private
*/
NzTabsNavComponent.prototype.currentTextContent;
/** @type {?} */
NzTabsNavComponent.prototype.showPaginationControls;
/** @type {?} */
NzTabsNavComponent.prototype.disableScrollAfter;
/** @type {?} */
NzTabsNavComponent.prototype.disableScrollBefore;
/** @type {?} */
NzTabsNavComponent.prototype.selectedIndexChanged;
/** @type {?} */
NzTabsNavComponent.prototype.realignInkBar;
/** @type {?} */
NzTabsNavComponent.prototype.tabLabelCount;
/** @type {?} */
NzTabsNavComponent.prototype.scrollDistanceChanged;
/** @type {?} */
NzTabsNavComponent.prototype.listOfNzTabLabelDirective;
/** @type {?} */
NzTabsNavComponent.prototype.nzTabsInkBarDirective;
/** @type {?} */
NzTabsNavComponent.prototype.navContainerElement;
/** @type {?} */
NzTabsNavComponent.prototype.navListElement;
/** @type {?} */
NzTabsNavComponent.prototype.scrollListElement;
/** @type {?} */
NzTabsNavComponent.prototype.nzOnNextClick;
/** @type {?} */
NzTabsNavComponent.prototype.nzOnPrevClick;
/** @type {?} */
NzTabsNavComponent.prototype.nzTabBarExtraContent;
/** @type {?} */
NzTabsNavComponent.prototype.nzAnimated;
/** @type {?} */
NzTabsNavComponent.prototype.nzHideBar;
/** @type {?} */
NzTabsNavComponent.prototype.nzShowPagination;
/** @type {?} */
NzTabsNavComponent.prototype.nzType;
/** @type {?} */
NzTabsNavComponent.prototype.elementRef;
/**
* @type {?}
* @private
*/
NzTabsNavComponent.prototype.ngZone;
/**
* @type {?}
* @private
*/
NzTabsNavComponent.prototype.renderer;
/**
* @type {?}
* @private
*/
NzTabsNavComponent.prototype.cdr;
/**
* @type {?}
* @private
*/
NzTabsNavComponent.prototype.dir;
}
//# 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code from https://github.com/angular/material2 */\nimport { Direction, Directionality } from '@angular/cdk/bidi';\nimport {\n  AfterContentChecked,\n  AfterContentInit,\n  ChangeDetectionStrategy, ChangeDetectorRef,\n  Component,\n  ContentChildren,\n  ElementRef,\n  EventEmitter,\n  Input,\n  NgZone,\n  Optional,\n  Output,\n  QueryList,\n  Renderer2,\n  TemplateRef,\n  ViewChild,\n  ViewEncapsulation\n} from '@angular/core';\nimport { fromEvent, merge, of as observableOf, Subscription } from 'rxjs';\nimport { auditTime, startWith } from 'rxjs/operators';\n\nimport { InputBoolean } from '../core/util/convert';\n\nimport { NzTabLabelDirective } from './nz-tab-label.directive';\nimport { NzTabsInkBarDirective } from './nz-tabs-ink-bar.directive';\nimport { NzTabPositionMode } from './nz-tabset.component';\n\nconst EXAGGERATED_OVERSCROLL = 64;\nexport type ScrollDirection = 'after' | 'before';\n\n@Component({\n  selector           : '[nz-tabs-nav]',\n  preserveWhitespaces: false,\n  changeDetection    : ChangeDetectionStrategy.OnPush,\n  encapsulation      : ViewEncapsulation.None,\n  templateUrl        : './nz-tabs-nav.component.html'\n})\nexport class NzTabsNavComponent implements AfterContentChecked, AfterContentInit {\n  private _tabPositionMode: NzTabPositionMode = 'horizontal';\n  private _scrollDistance = 0;\n  private _selectedIndex = 0;\n  /** Cached text content of the header. */\n  private currentTextContent: string;\n  showPaginationControls = false;\n  disableScrollAfter = true;\n  disableScrollBefore = true;\n  selectedIndexChanged = false;\n  realignInkBar: Subscription | null = null;\n  tabLabelCount: number;\n  scrollDistanceChanged: boolean;\n  @ContentChildren(NzTabLabelDirective) listOfNzTabLabelDirective: QueryList<NzTabLabelDirective>;\n  @ViewChild(NzTabsInkBarDirective) nzTabsInkBarDirective: NzTabsInkBarDirective;\n  @ViewChild('navContainerElement') navContainerElement: ElementRef;\n  @ViewChild('navListElement') navListElement: ElementRef;\n  @ViewChild('scrollListElement') scrollListElement: ElementRef;\n  @Output() readonly nzOnNextClick = new EventEmitter<void>();\n  @Output() readonly nzOnPrevClick = new EventEmitter<void>();\n  @Input() nzTabBarExtraContent: TemplateRef<void>;\n  @Input() @InputBoolean() nzAnimated = true;\n  @Input() @InputBoolean() nzHideBar = false;\n  @Input() @InputBoolean() nzShowPagination = true;\n  @Input() nzType = 'line';\n\n  @Input()\n  set nzPositionMode(value: NzTabPositionMode) {\n    this._tabPositionMode = value;\n    this.alignInkBarToSelectedTab();\n    if (this.nzShowPagination) {\n      Promise.resolve().then(() => {\n        this.updatePagination();\n      });\n    }\n  }\n\n  get nzPositionMode(): NzTabPositionMode {\n    return this._tabPositionMode;\n  }\n\n  @Input()\n  set selectedIndex(value: number) {\n    this.selectedIndexChanged = this._selectedIndex !== value;\n    this._selectedIndex = value;\n  }\n\n  get selectedIndex(): number {\n    return this._selectedIndex;\n  }\n\n  constructor(public elementRef: ElementRef,\n              private ngZone: NgZone,\n              private renderer: Renderer2,\n              private cdr: ChangeDetectorRef,\n              @Optional() private dir: Directionality) {\n  }\n\n  onContentChanges(): void {\n    const textContent = this.elementRef.nativeElement.textContent;\n    // We need to diff the text content of the header, because the MutationObserver callback\n    // will fire even if the text content didn't change which is inefficient and is prone\n    // to infinite loops if a poorly constructed expression is passed in (see #14249).\n    if (textContent !== this.currentTextContent) {\n      this.ngZone.run(() => {\n        if (this.nzShowPagination) {\n          this.updatePagination();\n        }\n        this.alignInkBarToSelectedTab();\n        this.cdr.markForCheck();\n      });\n    }\n\n  }\n\n  scrollHeader(scrollDir: ScrollDirection): void {\n    if (scrollDir === 'before' && !this.disableScrollBefore) {\n      this.nzOnPrevClick.emit();\n    } else if (scrollDir === 'after' && !this.disableScrollAfter) {\n      this.nzOnNextClick.emit();\n    }\n    // Move the scroll distance one-third the length of the tab list's viewport.\n    this.scrollDistance += (scrollDir === 'before' ? -1 : 1) * this.viewWidthHeightPix / 3;\n  }\n\n  ngAfterContentChecked(): void {\n\n    if (this.tabLabelCount !== this.listOfNzTabLabelDirective.length) {\n      if (this.nzShowPagination) {\n        this.updatePagination();\n      }\n      this.tabLabelCount = this.listOfNzTabLabelDirective.length;\n      this.cdr.markForCheck();\n    }\n    if (this.selectedIndexChanged) {\n      this.scrollToLabel(this._selectedIndex);\n      if (this.nzShowPagination) {\n        this.checkScrollingControls();\n      }\n      this.alignInkBarToSelectedTab();\n      this.selectedIndexChanged = false;\n      this.cdr.markForCheck();\n    }\n    if (this.scrollDistanceChanged) {\n      if (this.nzShowPagination) {\n        this.updateTabScrollPosition();\n      }\n      this.scrollDistanceChanged = false;\n      this.cdr.markForCheck();\n    }\n  }\n\n  ngAfterContentInit(): void {\n    this.realignInkBar = this.ngZone.runOutsideAngular(() => {\n      const dirChange = this.dir ? this.dir.change : observableOf(null);\n      const resize = typeof window !== 'undefined' ?\n        fromEvent(window, 'resize').pipe(auditTime(10)) :\n        observableOf(null);\n      return merge(dirChange, resize).pipe(startWith(null)).subscribe(() => {\n        if (this.nzShowPagination) {\n          this.updatePagination();\n        }\n        this.alignInkBarToSelectedTab();\n      });\n    });\n  }\n\n  updateTabScrollPosition(): void {\n    const scrollDistance = this.scrollDistance;\n    if (this.nzPositionMode === 'horizontal') {\n      const translateX = this.getLayoutDirection() === 'ltr' ? -scrollDistance : scrollDistance;\n      this.renderer.setStyle(this.navListElement.nativeElement, 'transform', `translate3d(${translateX}px, 0, 0)`);\n    } else {\n      this.renderer.setStyle(this.navListElement.nativeElement, 'transform', `translate3d(0,${-scrollDistance}px, 0)`);\n    }\n  }\n\n  updatePagination(): void {\n    this.checkPaginationEnabled();\n    this.checkScrollingControls();\n    this.updateTabScrollPosition();\n  }\n\n  checkPaginationEnabled(): void {\n    const isEnabled = this.tabListScrollWidthHeightPix > this.tabListScrollOffSetWidthHeight;\n    if (!isEnabled) {\n      this.scrollDistance = 0;\n    }\n    if (isEnabled !== this.showPaginationControls) {\n      this.cdr.markForCheck();\n    }\n    this.showPaginationControls = isEnabled;\n  }\n\n  scrollToLabel(labelIndex: number): void {\n    const selectedLabel = this.listOfNzTabLabelDirective\n      ? this.listOfNzTabLabelDirective.toArray()[ labelIndex ]\n      : null;\n\n    if (selectedLabel) {\n      // The view length is the visible width of the tab labels.\n\n      let labelBeforePos: number;\n      let labelAfterPos: number;\n      if (this.nzPositionMode === 'horizontal') {\n        if (this.getLayoutDirection() === 'ltr') {\n          labelBeforePos = selectedLabel.getOffsetLeft();\n          labelAfterPos = labelBeforePos + selectedLabel.getOffsetWidth();\n        } else {\n          labelAfterPos = this.navListElement.nativeElement.offsetWidth - selectedLabel.getOffsetLeft();\n          labelBeforePos = labelAfterPos - selectedLabel.getOffsetWidth();\n        }\n      } else {\n        labelBeforePos = selectedLabel.getOffsetTop();\n        labelAfterPos = labelBeforePos + selectedLabel.getOffsetHeight();\n      }\n      const beforeVisiblePos = this.scrollDistance;\n      const afterVisiblePos = this.scrollDistance + this.viewWidthHeightPix;\n\n      if (labelBeforePos < beforeVisiblePos) {\n        // Scroll header to move label to the before direction\n        this.scrollDistance -= beforeVisiblePos - labelBeforePos + EXAGGERATED_OVERSCROLL;\n      } else if (labelAfterPos > afterVisiblePos) {\n        // Scroll header to move label to the after direction\n        this.scrollDistance += labelAfterPos - afterVisiblePos + EXAGGERATED_OVERSCROLL;\n      }\n    }\n  }\n\n  checkScrollingControls(): void {\n    // Check if the pagination arrows should be activated.\n    this.disableScrollBefore = this.scrollDistance === 0;\n    this.disableScrollAfter = this.scrollDistance === this.getMaxScrollDistance();\n    this.cdr.markForCheck();\n  }\n\n  /**\n   * Determines what is the maximum length in pixels that can be set for the scroll distance. This\n   * is equal to the difference in width between the tab list container and tab header container.\n   *\n   * This is an expensive call that forces a layout reflow to compute box and scroll metrics and\n   * should be called sparingly.\n   */\n  getMaxScrollDistance(): number {\n    return (this.tabListScrollWidthHeightPix - this.viewWidthHeightPix) || 0;\n  }\n\n  /** Sets the distance in pixels that the tab header should be transformed in the X-axis. */\n  set scrollDistance(v: number) {\n    this._scrollDistance = Math.max(0, Math.min(this.getMaxScrollDistance(), v));\n\n    // Mark that the scroll distance has changed so that after the view is checked, the CSS\n    // transformation can move the header.\n    this.scrollDistanceChanged = true;\n\n    this.checkScrollingControls();\n  }\n\n  get scrollDistance(): number {\n    return this._scrollDistance;\n  }\n\n  get viewWidthHeightPix(): number {\n    let PAGINATION_PIX = 0;\n    if (this.showPaginationControls) {\n      PAGINATION_PIX = 64;\n    }\n    if (this.nzPositionMode === 'horizontal') {\n      return this.navContainerElement.nativeElement.offsetWidth - PAGINATION_PIX;\n    } else {\n      return this.navContainerElement.nativeElement.offsetHeight - PAGINATION_PIX;\n    }\n  }\n\n  get tabListScrollWidthHeightPix(): number {\n    if (this.nzPositionMode === 'horizontal') {\n      return this.navListElement.nativeElement.scrollWidth;\n    } else {\n      return this.navListElement.nativeElement.scrollHeight;\n    }\n  }\n\n  get tabListScrollOffSetWidthHeight(): number {\n    if (this.nzPositionMode === 'horizontal') {\n      return this.scrollListElement.nativeElement.offsetWidth;\n    } else {\n      return this.elementRef.nativeElement.offsetHeight;\n    }\n  }\n\n  getLayoutDirection(): Direction {\n    return this.dir && this.dir.value === 'rtl' ? 'rtl' : 'ltr';\n  }\n\n  alignInkBarToSelectedTab(): void {\n    if (this.nzType === 'line') {\n      const selectedLabelWrapper = this.listOfNzTabLabelDirective && this.listOfNzTabLabelDirective.length\n        ? this.listOfNzTabLabelDirective.toArray()[ this.selectedIndex ].elementRef.nativeElement\n        : null;\n      if (this.nzTabsInkBarDirective) {\n        this.nzTabsInkBarDirective.alignToElement(selectedLabelWrapper);\n      }\n    }\n  }\n}\n"]}