@angular/material
Version:
Angular Material
249 lines • 40.5 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 { coerceBooleanProperty } from '@angular/cdk/coercion';
import { ChangeDetectionStrategy, ChangeDetectorRef, Component, Input, Optional, ViewEncapsulation, Inject, ElementRef, } from '@angular/core';
import { mixinDisabled } from '@angular/material/core';
import { FocusMonitor } from '@angular/cdk/a11y';
import { ENTER, SPACE } from '@angular/cdk/keycodes';
import { merge } from 'rxjs';
import { MatSort } from './sort';
import { matSortAnimations } from './sort-animations';
import { getSortHeaderNotContainedWithinSortError } from './sort-errors';
import { MatSortHeaderIntl } from './sort-header-intl';
// Boilerplate for applying mixins to the sort header.
/** @docs-private */
class MatSortHeaderBase {
}
const _MatSortHeaderMixinBase = mixinDisabled(MatSortHeaderBase);
/**
* Applies sorting behavior (click to change sort) and styles to an element, including an
* arrow to display the current sort direction.
*
* Must be provided with an id and contained within a parent MatSort directive.
*
* If used on header cells in a CdkTable, it will automatically default its id from its containing
* column definition.
*/
export class MatSortHeader extends _MatSortHeaderMixinBase {
constructor(_intl, changeDetectorRef,
// `MatSort` is not optionally injected, but just asserted manually w/ better error.
// tslint:disable-next-line: lightweight-tokens
_sort, _columnDef, _focusMonitor, _elementRef) {
// Note that we use a string token for the `_columnDef`, because the value is provided both by
// `material/table` and `cdk/table` and we can't have the CDK depending on Material,
// and we want to avoid having the sort header depending on the CDK table because
// of this single reference.
super();
this._intl = _intl;
this._sort = _sort;
this._columnDef = _columnDef;
this._focusMonitor = _focusMonitor;
this._elementRef = _elementRef;
/**
* Flag set to true when the indicator should be displayed while the sort is not active. Used to
* provide an affordance that the header is sortable by showing on focus and hover.
*/
this._showIndicatorHint = false;
/** The direction the arrow should be facing according to the current state. */
this._arrowDirection = '';
/**
* Whether the view state animation should show the transition between the `from` and `to` states.
*/
this._disableViewStateAnimation = false;
/** Sets the position of the arrow that displays when sorted. */
this.arrowPosition = 'after';
if (!_sort && (typeof ngDevMode === 'undefined' || ngDevMode)) {
throw getSortHeaderNotContainedWithinSortError();
}
this._rerenderSubscription = merge(_sort.sortChange, _sort._stateChanges, _intl.changes)
.subscribe(() => {
if (this._isSorted()) {
this._updateArrowDirection();
}
// If this header was recently active and now no longer sorted, animate away the arrow.
if (!this._isSorted() && this._viewState && this._viewState.toState === 'active') {
this._disableViewStateAnimation = false;
this._setAnimationTransitionState({ fromState: 'active', toState: this._arrowDirection });
}
changeDetectorRef.markForCheck();
});
}
/** Overrides the disable clear value of the containing MatSort for this MatSortable. */
get disableClear() { return this._disableClear; }
set disableClear(v) { this._disableClear = coerceBooleanProperty(v); }
ngOnInit() {
if (!this.id && this._columnDef) {
this.id = this._columnDef.name;
}
// Initialize the direction of the arrow and set the view state to be immediately that state.
this._updateArrowDirection();
this._setAnimationTransitionState({ toState: this._isSorted() ? 'active' : this._arrowDirection });
this._sort.register(this);
}
ngAfterViewInit() {
// We use the focus monitor because we also want to style
// things differently based on the focus origin.
this._focusMonitor.monitor(this._elementRef, true)
.subscribe(origin => this._setIndicatorHintVisible(!!origin));
}
ngOnDestroy() {
this._focusMonitor.stopMonitoring(this._elementRef);
this._sort.deregister(this);
this._rerenderSubscription.unsubscribe();
}
/**
* Sets the "hint" state such that the arrow will be semi-transparently displayed as a hint to the
* user showing what the active sort will become. If set to false, the arrow will fade away.
*/
_setIndicatorHintVisible(visible) {
// No-op if the sort header is disabled - should not make the hint visible.
if (this._isDisabled() && visible) {
return;
}
this._showIndicatorHint = visible;
if (!this._isSorted()) {
this._updateArrowDirection();
if (this._showIndicatorHint) {
this._setAnimationTransitionState({ fromState: this._arrowDirection, toState: 'hint' });
}
else {
this._setAnimationTransitionState({ fromState: 'hint', toState: this._arrowDirection });
}
}
}
/**
* Sets the animation transition view state for the arrow's position and opacity. If the
* `disableViewStateAnimation` flag is set to true, the `fromState` will be ignored so that
* no animation appears.
*/
_setAnimationTransitionState(viewState) {
this._viewState = viewState;
// If the animation for arrow position state (opacity/translation) should be disabled,
// remove the fromState so that it jumps right to the toState.
if (this._disableViewStateAnimation) {
this._viewState = { toState: viewState.toState };
}
}
/** Triggers the sort on this sort header and removes the indicator hint. */
_toggleOnInteraction() {
this._sort.sort(this);
// Do not show the animation if the header was already shown in the right position.
if (this._viewState.toState === 'hint' || this._viewState.toState === 'active') {
this._disableViewStateAnimation = true;
}
// If the arrow is now sorted, animate the arrow into place. Otherwise, animate it away into
// the direction it is facing.
const viewState = this._isSorted() ?
{ fromState: this._arrowDirection, toState: 'active' } :
{ fromState: 'active', toState: this._arrowDirection };
this._setAnimationTransitionState(viewState);
this._showIndicatorHint = false;
}
_handleClick() {
if (!this._isDisabled()) {
this._toggleOnInteraction();
}
}
_handleKeydown(event) {
if (!this._isDisabled() && (event.keyCode === SPACE || event.keyCode === ENTER)) {
event.preventDefault();
this._toggleOnInteraction();
}
}
/** Whether this MatSortHeader is currently sorted in either ascending or descending order. */
_isSorted() {
return this._sort.active == this.id &&
(this._sort.direction === 'asc' || this._sort.direction === 'desc');
}
/** Returns the animation state for the arrow direction (indicator and pointers). */
_getArrowDirectionState() {
return `${this._isSorted() ? 'active-' : ''}${this._arrowDirection}`;
}
/** Returns the arrow position state (opacity, translation). */
_getArrowViewState() {
const fromState = this._viewState.fromState;
return (fromState ? `${fromState}-to-` : '') + this._viewState.toState;
}
/**
* Updates the direction the arrow should be pointing. If it is not sorted, the arrow should be
* facing the start direction. Otherwise if it is sorted, the arrow should point in the currently
* active sorted direction. The reason this is updated through a function is because the direction
* should only be changed at specific times - when deactivated but the hint is displayed and when
* the sort is active and the direction changes. Otherwise the arrow's direction should linger
* in cases such as the sort becoming deactivated but we want to animate the arrow away while
* preserving its direction, even though the next sort direction is actually different and should
* only be changed once the arrow displays again (hint or activation).
*/
_updateArrowDirection() {
this._arrowDirection = this._isSorted() ?
this._sort.direction :
(this.start || this._sort.start);
}
_isDisabled() {
return this._sort.disabled || this.disabled;
}
/**
* Gets the aria-sort attribute that should be applied to this sort header. If this header
* is not sorted, returns null so that the attribute is removed from the host element. Aria spec
* says that the aria-sort property should only be present on one header at a time, so removing
* ensures this is true.
*/
_getAriaSortAttribute() {
if (!this._isSorted()) {
return 'none';
}
return this._sort.direction == 'asc' ? 'ascending' : 'descending';
}
/** Whether the arrow inside the sort header should be rendered. */
_renderArrow() {
return !this._isDisabled() || this._isSorted();
}
}
MatSortHeader.decorators = [
{ type: Component, args: [{
selector: '[mat-sort-header]',
exportAs: 'matSortHeader',
template: "<!--\n We set the `tabindex` on an element inside the table header, rather than the header itself,\n because of a bug in NVDA where having a `tabindex` on a `th` breaks keyboard navigation in the\n table (see https://github.com/nvaccess/nvda/issues/7718). This allows for the header to both\n be focusable, and have screen readers read out its `aria-sort` state. We prefer this approach\n over having a button with an `aria-label` inside the header, because the button's `aria-label`\n will be read out as the user is navigating the table's cell (see #13012).\n\n The approach is based off of: https://dequeuniversity.com/library/aria/tables/sf-sortable-grid\n-->\n<div class=\"mat-sort-header-container mat-focus-indicator\"\n [class.mat-sort-header-sorted]=\"_isSorted()\"\n [class.mat-sort-header-position-before]=\"arrowPosition == 'before'\"\n [attr.tabindex]=\"_isDisabled() ? null : 0\"\n role=\"button\">\n\n <!--\n TODO(crisbeto): this div isn't strictly necessary, but we have to keep it due to a large\n number of screenshot diff failures. It should be removed eventually. Note that the difference\n isn't visible with a shorter header, but once it breaks up into multiple lines, this element\n causes it to be center-aligned, whereas removing it will keep the text to the left.\n -->\n <div class=\"mat-sort-header-content\">\n <ng-content></ng-content>\n </div>\n\n <!-- Disable animations while a current animation is running -->\n <div class=\"mat-sort-header-arrow\"\n *ngIf=\"_renderArrow()\"\n [@arrowOpacity]=\"_getArrowViewState()\"\n [@arrowPosition]=\"_getArrowViewState()\"\n [@allowChildren]=\"_getArrowDirectionState()\"\n (@arrowPosition.start)=\"_disableViewStateAnimation = true\"\n (@arrowPosition.done)=\"_disableViewStateAnimation = false\">\n <div class=\"mat-sort-header-stem\"></div>\n <div class=\"mat-sort-header-indicator\" [@indicator]=\"_getArrowDirectionState()\">\n <div class=\"mat-sort-header-pointer-left\" [@leftPointer]=\"_getArrowDirectionState()\"></div>\n <div class=\"mat-sort-header-pointer-right\" [@rightPointer]=\"_getArrowDirectionState()\"></div>\n <div class=\"mat-sort-header-pointer-middle\"></div>\n </div>\n </div>\n</div>\n",
host: {
'class': 'mat-sort-header',
'(click)': '_handleClick()',
'(keydown)': '_handleKeydown($event)',
'(mouseenter)': '_setIndicatorHintVisible(true)',
'(mouseleave)': '_setIndicatorHintVisible(false)',
'[attr.aria-sort]': '_getAriaSortAttribute()',
'[class.mat-sort-header-disabled]': '_isDisabled()',
},
encapsulation: ViewEncapsulation.None,
changeDetection: ChangeDetectionStrategy.OnPush,
inputs: ['disabled'],
animations: [
matSortAnimations.indicator,
matSortAnimations.leftPointer,
matSortAnimations.rightPointer,
matSortAnimations.arrowOpacity,
matSortAnimations.arrowPosition,
matSortAnimations.allowChildren,
],
styles: [".mat-sort-header-container{display:flex;cursor:pointer;align-items:center;letter-spacing:normal;outline:0}[mat-sort-header].cdk-keyboard-focused .mat-sort-header-container,[mat-sort-header].cdk-program-focused .mat-sort-header-container{border-bottom:solid 1px currentColor}.mat-sort-header-disabled .mat-sort-header-container{cursor:default}.mat-sort-header-content{text-align:center;display:flex;align-items:center}.mat-sort-header-position-before{flex-direction:row-reverse}.mat-sort-header-arrow{height:12px;width:12px;min-width:12px;position:relative;display:flex;opacity:0}.mat-sort-header-arrow,[dir=rtl] .mat-sort-header-position-before .mat-sort-header-arrow{margin:0 0 0 6px}.mat-sort-header-position-before .mat-sort-header-arrow,[dir=rtl] .mat-sort-header-arrow{margin:0 6px 0 0}.mat-sort-header-stem{background:currentColor;height:10px;width:2px;margin:auto;display:flex;align-items:center}.cdk-high-contrast-active .mat-sort-header-stem{width:0;border-left:solid 2px}.mat-sort-header-indicator{width:100%;height:2px;display:flex;align-items:center;position:absolute;top:0;left:0}.mat-sort-header-pointer-middle{margin:auto;height:2px;width:2px;background:currentColor;transform:rotate(45deg)}.cdk-high-contrast-active .mat-sort-header-pointer-middle{width:0;height:0;border-top:solid 2px;border-left:solid 2px}.mat-sort-header-pointer-left,.mat-sort-header-pointer-right{background:currentColor;width:6px;height:2px;position:absolute;top:0}.cdk-high-contrast-active .mat-sort-header-pointer-left,.cdk-high-contrast-active .mat-sort-header-pointer-right{width:0;height:0;border-left:solid 6px;border-top:solid 2px}.mat-sort-header-pointer-left{transform-origin:right;left:0}.mat-sort-header-pointer-right{transform-origin:left;right:0}\n"]
},] }
];
MatSortHeader.ctorParameters = () => [
{ type: MatSortHeaderIntl },
{ type: ChangeDetectorRef },
{ type: MatSort, decorators: [{ type: Optional }] },
{ type: undefined, decorators: [{ type: Inject, args: ['MAT_SORT_HEADER_COLUMN_DEF',] }, { type: Optional }] },
{ type: FocusMonitor },
{ type: ElementRef }
];
MatSortHeader.propDecorators = {
id: [{ type: Input, args: ['mat-sort-header',] }],
arrowPosition: [{ type: Input }],
start: [{ type: Input }],
disableClear: [{ type: Input }]
};
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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 */\n\nimport {BooleanInput, coerceBooleanProperty} from '@angular/cdk/coercion';\nimport {\n  ChangeDetectionStrategy,\n  ChangeDetectorRef,\n  Component,\n  Input,\n  OnDestroy,\n  OnInit,\n  Optional,\n  ViewEncapsulation,\n  Inject,\n  ElementRef,\n  AfterViewInit,\n} from '@angular/core';\nimport {CanDisable, CanDisableCtor, mixinDisabled} from '@angular/material/core';\nimport {FocusMonitor} from '@angular/cdk/a11y';\nimport {ENTER, SPACE} from '@angular/cdk/keycodes';\nimport {merge, Subscription} from 'rxjs';\nimport {MatSort, MatSortable} from './sort';\nimport {matSortAnimations} from './sort-animations';\nimport {SortDirection} from './sort-direction';\nimport {getSortHeaderNotContainedWithinSortError} from './sort-errors';\nimport {MatSortHeaderIntl} from './sort-header-intl';\n\n\n// Boilerplate for applying mixins to the sort header.\n/** @docs-private */\nclass MatSortHeaderBase {}\nconst _MatSortHeaderMixinBase: CanDisableCtor & typeof MatSortHeaderBase =\n    mixinDisabled(MatSortHeaderBase);\n\n/**\n * Valid positions for the arrow to be in for its opacity and translation. If the state is a\n * sort direction, the position of the arrow will be above/below and opacity 0. If the state is\n * hint, the arrow will be in the center with a slight opacity. Active state means the arrow will\n * be fully opaque in the center.\n *\n * @docs-private\n */\nexport type ArrowViewState = SortDirection | 'hint' | 'active';\n\n/**\n * States describing the arrow's animated position (animating fromState to toState).\n * If the fromState is not defined, there will be no animated transition to the toState.\n * @docs-private\n */\nexport interface ArrowViewStateTransition {\n  fromState?: ArrowViewState;\n  toState: ArrowViewState;\n}\n\n/** Column definition associated with a `MatSortHeader`. */\ninterface MatSortHeaderColumnDef {\n  name: string;\n}\n\n/**\n * Applies sorting behavior (click to change sort) and styles to an element, including an\n * arrow to display the current sort direction.\n *\n * Must be provided with an id and contained within a parent MatSort directive.\n *\n * If used on header cells in a CdkTable, it will automatically default its id from its containing\n * column definition.\n */\n@Component({\n  selector: '[mat-sort-header]',\n  exportAs: 'matSortHeader',\n  templateUrl: 'sort-header.html',\n  styleUrls: ['sort-header.css'],\n  host: {\n    'class': 'mat-sort-header',\n    '(click)': '_handleClick()',\n    '(keydown)': '_handleKeydown($event)',\n    '(mouseenter)': '_setIndicatorHintVisible(true)',\n    '(mouseleave)': '_setIndicatorHintVisible(false)',\n    '[attr.aria-sort]': '_getAriaSortAttribute()',\n    '[class.mat-sort-header-disabled]': '_isDisabled()',\n  },\n  encapsulation: ViewEncapsulation.None,\n  changeDetection: ChangeDetectionStrategy.OnPush,\n  inputs: ['disabled'],\n  animations: [\n    matSortAnimations.indicator,\n    matSortAnimations.leftPointer,\n    matSortAnimations.rightPointer,\n    matSortAnimations.arrowOpacity,\n    matSortAnimations.arrowPosition,\n    matSortAnimations.allowChildren,\n  ]\n})\nexport class MatSortHeader extends _MatSortHeaderMixinBase\n    implements CanDisable, MatSortable, OnDestroy, OnInit, AfterViewInit {\n  private _rerenderSubscription: Subscription;\n\n  /**\n   * Flag set to true when the indicator should be displayed while the sort is not active. Used to\n   * provide an affordance that the header is sortable by showing on focus and hover.\n   */\n  _showIndicatorHint: boolean = false;\n\n  /**\n   * The view transition state of the arrow (translation/ opacity) - indicates its `from` and `to`\n   * position through the animation. If animations are currently disabled, the fromState is removed\n   * so that there is no animation displayed.\n   */\n  _viewState: ArrowViewStateTransition;\n\n  /** The direction the arrow should be facing according to the current state. */\n  _arrowDirection: SortDirection = '';\n\n  /**\n   * Whether the view state animation should show the transition between the `from` and `to` states.\n   */\n  _disableViewStateAnimation = false;\n\n  /**\n   * ID of this sort header. If used within the context of a CdkColumnDef, this will default to\n   * the column's name.\n   */\n  @Input('mat-sort-header') id: string;\n\n  /** Sets the position of the arrow that displays when sorted. */\n  @Input() arrowPosition: 'before' | 'after' = 'after';\n\n  /** Overrides the sort start value of the containing MatSort for this MatSortable. */\n  @Input() start: 'asc' | 'desc';\n\n  /** Overrides the disable clear value of the containing MatSort for this MatSortable. */\n  @Input()\n  get disableClear(): boolean { return this._disableClear; }\n  set disableClear(v) { this._disableClear = coerceBooleanProperty(v); }\n  private _disableClear: boolean;\n\n  constructor(public _intl: MatSortHeaderIntl,\n              changeDetectorRef: ChangeDetectorRef,\n              // `MatSort` is not optionally injected, but just asserted manually w/ better error.\n              // tslint:disable-next-line: lightweight-tokens\n              @Optional() public _sort: MatSort,\n              @Inject('MAT_SORT_HEADER_COLUMN_DEF') @Optional()\n                  public _columnDef: MatSortHeaderColumnDef,\n              private _focusMonitor: FocusMonitor,\n              private _elementRef: ElementRef<HTMLElement>) {\n    // Note that we use a string token for the `_columnDef`, because the value is provided both by\n    // `material/table` and `cdk/table` and we can't have the CDK depending on Material,\n    // and we want to avoid having the sort header depending on the CDK table because\n    // of this single reference.\n    super();\n\n    if (!_sort && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n      throw getSortHeaderNotContainedWithinSortError();\n    }\n\n    this._rerenderSubscription = merge(_sort.sortChange, _sort._stateChanges, _intl.changes)\n        .subscribe(() => {\n          if (this._isSorted()) {\n            this._updateArrowDirection();\n          }\n\n          // If this header was recently active and now no longer sorted, animate away the arrow.\n          if (!this._isSorted() && this._viewState && this._viewState.toState === 'active') {\n            this._disableViewStateAnimation = false;\n            this._setAnimationTransitionState({fromState: 'active', toState: this._arrowDirection});\n          }\n\n          changeDetectorRef.markForCheck();\n        });\n  }\n\n  ngOnInit() {\n    if (!this.id && this._columnDef) {\n      this.id = this._columnDef.name;\n    }\n\n    // Initialize the direction of the arrow and set the view state to be immediately that state.\n    this._updateArrowDirection();\n    this._setAnimationTransitionState(\n        {toState: this._isSorted() ? 'active' : this._arrowDirection});\n\n    this._sort.register(this);\n  }\n\n  ngAfterViewInit() {\n    // We use the focus monitor because we also want to style\n    // things differently based on the focus origin.\n    this._focusMonitor.monitor(this._elementRef, true)\n        .subscribe(origin => this._setIndicatorHintVisible(!!origin));\n  }\n\n  ngOnDestroy() {\n    this._focusMonitor.stopMonitoring(this._elementRef);\n    this._sort.deregister(this);\n    this._rerenderSubscription.unsubscribe();\n  }\n\n  /**\n   * Sets the \"hint\" state such that the arrow will be semi-transparently displayed as a hint to the\n   * user showing what the active sort will become. If set to false, the arrow will fade away.\n   */\n  _setIndicatorHintVisible(visible: boolean) {\n    // No-op if the sort header is disabled - should not make the hint visible.\n    if (this._isDisabled() && visible) { return; }\n\n    this._showIndicatorHint = visible;\n\n    if (!this._isSorted()) {\n      this._updateArrowDirection();\n      if (this._showIndicatorHint) {\n        this._setAnimationTransitionState({fromState: this._arrowDirection, toState: 'hint'});\n      } else {\n        this._setAnimationTransitionState({fromState: 'hint', toState: this._arrowDirection});\n      }\n    }\n  }\n\n  /**\n   * Sets the animation transition view state for the arrow's position and opacity. If the\n   * `disableViewStateAnimation` flag is set to true, the `fromState` will be ignored so that\n   * no animation appears.\n   */\n  _setAnimationTransitionState(viewState: ArrowViewStateTransition) {\n    this._viewState = viewState;\n\n    // If the animation for arrow position state (opacity/translation) should be disabled,\n    // remove the fromState so that it jumps right to the toState.\n    if (this._disableViewStateAnimation) {\n      this._viewState = {toState: viewState.toState};\n    }\n  }\n\n  /** Triggers the sort on this sort header and removes the indicator hint. */\n  _toggleOnInteraction() {\n\n    this._sort.sort(this);\n\n    // Do not show the animation if the header was already shown in the right position.\n    if (this._viewState.toState === 'hint' || this._viewState.toState === 'active') {\n      this._disableViewStateAnimation = true;\n    }\n\n    // If the arrow is now sorted, animate the arrow into place. Otherwise, animate it away into\n    // the direction it is facing.\n    const viewState: ArrowViewStateTransition = this._isSorted() ?\n        {fromState: this._arrowDirection, toState: 'active'} :\n        {fromState: 'active', toState: this._arrowDirection};\n    this._setAnimationTransitionState(viewState);\n\n    this._showIndicatorHint = false;\n  }\n\n  _handleClick() {\n    if (!this._isDisabled()) {\n      this._toggleOnInteraction();\n    }\n  }\n\n  _handleKeydown(event: KeyboardEvent) {\n    if (!this._isDisabled() && (event.keyCode === SPACE || event.keyCode === ENTER)) {\n      event.preventDefault();\n      this._toggleOnInteraction();\n    }\n  }\n\n  /** Whether this MatSortHeader is currently sorted in either ascending or descending order. */\n  _isSorted() {\n    return this._sort.active == this.id &&\n        (this._sort.direction === 'asc' || this._sort.direction === 'desc');\n  }\n\n  /** Returns the animation state for the arrow direction (indicator and pointers). */\n  _getArrowDirectionState() {\n    return `${this._isSorted() ? 'active-' : ''}${this._arrowDirection}`;\n  }\n\n  /** Returns the arrow position state (opacity, translation). */\n  _getArrowViewState() {\n    const fromState = this._viewState.fromState;\n    return (fromState ? `${fromState}-to-` : '') + this._viewState.toState;\n  }\n\n  /**\n   * Updates the direction the arrow should be pointing. If it is not sorted, the arrow should be\n   * facing the start direction. Otherwise if it is sorted, the arrow should point in the currently\n   * active sorted direction. The reason this is updated through a function is because the direction\n   * should only be changed at specific times - when deactivated but the hint is displayed and when\n   * the sort is active and the direction changes. Otherwise the arrow's direction should linger\n   * in cases such as the sort becoming deactivated but we want to animate the arrow away while\n   * preserving its direction, even though the next sort direction is actually different and should\n   * only be changed once the arrow displays again (hint or activation).\n   */\n  _updateArrowDirection() {\n    this._arrowDirection = this._isSorted() ?\n        this._sort.direction :\n        (this.start || this._sort.start);\n  }\n\n  _isDisabled() {\n    return this._sort.disabled || this.disabled;\n  }\n\n  /**\n   * Gets the aria-sort attribute that should be applied to this sort header. If this header\n   * is not sorted, returns null so that the attribute is removed from the host element. Aria spec\n   * says that the aria-sort property should only be present on one header at a time, so removing\n   * ensures this is true.\n   */\n  _getAriaSortAttribute() {\n    if (!this._isSorted()) {\n      return 'none';\n    }\n\n    return this._sort.direction == 'asc' ? 'ascending' : 'descending';\n  }\n\n  /** Whether the arrow inside the sort header should be rendered. */\n  _renderArrow() {\n    return !this._isDisabled() || this._isSorted();\n  }\n\n  static ngAcceptInputType_disableClear: BooleanInput;\n  static ngAcceptInputType_disabled: BooleanInput;\n}\n"]}