feat(sort): add the ability to disable sort toggling

Adds the ability for a `mat-sort-header` or `mat-sort` instance to be disabled, preventing the user from changing the sorting direction.

Fixes #8622.

Author: crisbeto

src/demo-app/table/table-demo.html

@@ -221,7 +221,13 @@ <h3>MatTable With MatTableDataSource Example</h3>
 
   <table-header-demo (shiftColumns)="displayedColumns.push(displayedColumns.shift())"
                      (toggleColorColumn)="toggleColorColumn()" *ngIf="selection.isEmpty()">
+
+    <button mat-menu-item (click)="progressSortingDisabled = !progressSortingDisabled">
+      <mat-icon>sort</mat-icon>
+      Toggle Progress Sorting
+    </button>
   </table-header-demo>
+
   <div class="example-header example-selection-header"
        *ngIf="!selection.isEmpty()">
     {{selection.selected.length}}
@@ -257,7 +263,10 @@ <h3>MatTable With MatTableDataSource Example</h3>
 
     <!-- Column Definition: Progress -->
     <ng-container matColumnDef="progress">
-      <mat-header-cell *matHeaderCellDef mat-sort-header> Progress </mat-header-cell>
+      <mat-header-cell
+        *matHeaderCellDef
+        [disabled]="progressSortingDisabled"
+        mat-sort-header> Progress </mat-header-cell>
       <mat-cell *matCellDef="let row">
         <div class="demo-progress-stat">{{row.progress}}%</div>
         <div class="demo-progress-indicator-container">

src/demo-app/table/table-demo.ts

@@ -43,6 +43,7 @@ export class TableDemo {
   displayedColumns: UserProperties[] = [];
   trackByStrategy: TrackByStrategy = 'reference';
   changeReferences = false;
+  progressSortingDisabled = false;
   highlights = new Set<string>();
   wasExpanded = new Set<UserData>();
 

src/demo-app/table/table-header-demo.html

@@ -15,5 +15,6 @@
       <mat-icon>color_lens</mat-icon>
       Toggle Color Column
     </button>
+    <ng-content></ng-content>
   </mat-menu>
 </div>

src/lib/sort/sort-header.html

@@ -1,7 +1,8 @@
 <div class="mat-sort-header-container"
      [class.mat-sort-header-position-before]="arrowPosition == 'before'">
   <button class="mat-sort-header-button" type="button"
-          [attr.aria-label]="_intl.sortButtonLabel(id)">
+          [attr.aria-label]="_intl.sortButtonLabel(id)"
+          [attr.disabled]="_isDisabled() || null">
     <ng-content></ng-content>
   </button>
 

src/lib/sort/sort-header.scss

@@ -8,6 +8,10 @@ $mat-sort-header-arrow-transition: 225ms cubic-bezier(0.4, 0, 0.2, 1);
 .mat-sort-header-container {
   display: flex;
   cursor: pointer;
+
+  .mat-sort-header-disabled & {
+    cursor: default;
+  }
 }
 
 .mat-sort-header-position-before {
@@ -20,7 +24,7 @@ $mat-sort-header-arrow-transition: 225ms cubic-bezier(0.4, 0, 0.2, 1);
   display: flex;
   align-items: center;
   padding: 0;
-  cursor: pointer;
+  cursor: inherit;
   outline: 0;
   font: inherit;
   color: currentColor;

src/lib/sort/sort-header.ts

@@ -30,10 +30,18 @@ import {MatSort, MatSortable} from './sort';
 import {MatSortHeaderIntl} from './sort-header-intl';
 import {getSortHeaderNotContainedWithinSortError} from './sort-errors';
 import {AnimationCurves, AnimationDurations} from '@angular/material/core';
+import {CanDisable, mixinDisabled} from '@angular/material/core';
+
 
 const SORT_ANIMATION_TRANSITION =
     AnimationDurations.ENTERING + ' ' + AnimationCurves.STANDARD_CURVE;
 
+// Boilerplate for applying mixins to the sort header.
+/** @docs-private */
+export class MatSortHeaderBase {}
+export 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.
@@ -50,12 +58,14 @@ const SORT_ANIMATION_TRANSITION =
   templateUrl: 'sort-header.html',
   styleUrls: ['sort-header.css'],
   host: {
-    '(click)': '_sort.sort(this)',
+    '(click)': '_handleClick()',
     '[class.mat-sort-header-sorted]': '_isSorted()',
+    '[class.mat-sort-header-disabled]': '_isDisabled()',
   },
   encapsulation: ViewEncapsulation.None,
   preserveWhitespaces: false,
   changeDetection: ChangeDetectionStrategy.OnPush,
+  inputs: ['disabled'],
   animations: [
     trigger('indicator', [
       state('asc', style({transform: 'translateY(0px)'})),
@@ -93,7 +103,7 @@ const SORT_ANIMATION_TRANSITION =
     ])
   ]
 })
-export class MatSortHeader implements MatSortable {
+export class MatSortHeader extends _MatSortHeaderMixinBase implements MatSortable, CanDisable {
   private _rerenderSubscription: Subscription;
 
   /**
@@ -118,13 +128,15 @@ export class MatSortHeader implements MatSortable {
               changeDetectorRef: ChangeDetectorRef,
               @Optional() public _sort: MatSort,
               @Optional() public _cdkColumnDef: CdkColumnDef) {
+
+    super();
+
     if (!_sort) {
       throw getSortHeaderNotContainedWithinSortError();
     }
 
-    this._rerenderSubscription = merge(_sort.sortChange, _intl.changes).subscribe(() => {
-      changeDetectorRef.markForCheck();
-    });
+    this._rerenderSubscription = merge(_sort.sortChange, _sort._stateChanges, _intl.changes)
+      .subscribe(() => changeDetectorRef.markForCheck());
   }
 
   ngOnInit() {
@@ -140,9 +152,20 @@ export class MatSortHeader implements MatSortable {
     this._rerenderSubscription.unsubscribe();
   }
 
+  /** Handles click events on the header. */
+  _handleClick() {
+    if (!this._isDisabled()) {
+      this._sort.sort(this);
+    }
+  }
+
   /** 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');
   }
+
+  _isDisabled() {
+    return this._sort.disabled || this.disabled;
+  }
 }

src/lib/sort/sort.md

@@ -19,14 +19,19 @@ direction to sort (`asc` or `desc`).
 By default, a sort header starts its sorting at `asc` and then `desc`. Triggering the sort header
 after `desc` will remove sorting.
 
-To reverse the sort order for all headers, set the `matSortStart` to `desc` on the `matSort` 
-directive. To reverse the order only for a specific header, set the `start` input only on the header 
+To reverse the sort order for all headers, set the `matSortStart` to `desc` on the `matSort`
+directive. To reverse the order only for a specific header, set the `start` input only on the header
 instead.
 
-To prevent the user from clearing the sort sort state from an already sorted column, set 
-`matSortDisableClear` to `true` on the `matSort` to affect all headers, or set `disableClear` to 
+To prevent the user from clearing the sort sort state from an already sorted column, set
+`matSortDisableClear` to `true` on the `matSort` to affect all headers, or set `disableClear` to
 `true` on a specific header.
 
+#### Disabling sorting
+
+If you want to prevent the user from changing the sorting order of any column, you can use the
+`matSortDisabled` binding on the `mat-sort`, or the `disabled` on an single `mat-sort-header`.
+
 #### Using sort with the mat-table
 
 When used on an `mat-table` header, it is not required to set an `mat-sort-header` id on because

src/lib/sort/sort.spec.ts

@@ -109,6 +109,43 @@ describe('MatSort', () => {
     testSingleColumnSortDirectionSequence(fixture, ['desc', 'asc', '']);
   });
 
+  it('should allow for the cycling the sort direction to be disabled per column', () => {
+    const button = fixture.nativeElement.querySelector('#defaultSortHeaderA button');
+
+    component.sort('defaultSortHeaderA');
+    expect(component.matSort.direction).toBe('asc');
+    expect(button.getAttribute('disabled')).toBeFalsy();
+
+    component.disabledColumnSort = true;
+    fixture.detectChanges();
+
+    component.sort('defaultSortHeaderA');
+    expect(component.matSort.direction).toBe('asc');
+    expect(button.getAttribute('disabled')).toBe('true');
+  });
+
+  it('should allow for the cycling the sort direction to be disabled for all columns', () => {
+    const button = fixture.nativeElement.querySelector('#defaultSortHeaderA button');
+
+    component.sort('defaultSortHeaderA');
+    expect(component.matSort.active).toBe('defaultSortHeaderA');
+    expect(component.matSort.direction).toBe('asc');
+    expect(button.getAttribute('disabled')).toBeFalsy();
+
+    component.disableAllSort = true;
+    fixture.detectChanges();
+
+    component.sort('defaultSortHeaderA');
+    expect(component.matSort.active).toBe('defaultSortHeaderA');
+    expect(component.matSort.direction).toBe('asc');
+    expect(button.getAttribute('disabled')).toBe('true');
+
+    component.sort('defaultSortHeaderB');
+    expect(component.matSort.active).toBe('defaultSortHeaderA');
+    expect(component.matSort.direction).toBe('asc');
+    expect(button.getAttribute('disabled')).toBe('true');
+  });
+
   it('should reset sort direction when a different column is sorted', () => {
     component.sort('defaultSortHeaderA');
     expect(component.matSort.active).toBe('defaultSortHeaderA');
@@ -211,11 +248,16 @@ function testSingleColumnSortDirectionSequence(fixture: ComponentFixture<SimpleM
   template: `
     <div matSort
          [matSortActive]="active"
+         [matSortDisabled]="disableAllSort"
          [matSortStart]="start"
          [matSortDirection]="direction"
          [matSortDisableClear]="disableClear"
          (matSortChange)="latestSortEvent = $event">
-      <div id="defaultSortHeaderA" #defaultSortHeaderA mat-sort-header="defaultSortHeaderA">
+      <div
+        id="defaultSortHeaderA"
+        #defaultSortHeaderA
+        mat-sort-header="defaultSortHeaderA"
+        [disabled]="disabledColumnSort">
         A
       </div>
       <div id="defaultSortHeaderB" #defaultSortHeaderB mat-sort-header="defaultSortHeaderB">
@@ -233,6 +275,8 @@ class SimpleMatSortApp {
   start: SortDirection = 'asc';
   direction: SortDirection = '';
   disableClear: boolean;
+  disabledColumnSort = false;
+  disableAllSort = false;
 
   @ViewChild(MatSort) matSort: MatSort;
   @ViewChild('defaultSortHeaderA') matSortHeaderDefaultA: MatSortHeader;

src/lib/sort/sort.ts

@@ -6,14 +6,24 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {Directive, EventEmitter, Input, isDevMode, Output} from '@angular/core';
+import {
+  Directive,
+  EventEmitter,
+  Input,
+  isDevMode,
+  Output,
+  OnChanges,
+  OnDestroy,
+} from '@angular/core';
 import {coerceBooleanProperty} from '@angular/cdk/coercion';
+import {CanDisable, mixinDisabled} from '@angular/material/core';
 import {SortDirection} from './sort-direction';
 import {
   getSortInvalidDirectionError,
   getSortDuplicateSortableIdError,
   getSortHeaderMissingIdError
 } from './sort-errors';
+import {Subject} from 'rxjs/Subject';
 
 /** Interface for a directive that holds sorting state consumed by `MatSortHeader`. */
 export interface MatSortable {
@@ -36,15 +46,24 @@ export interface Sort {
   direction: SortDirection;
 }
 
+// Boilerplate for applying mixins to MatSort.
+/** @docs-private */
+export class MatSortBase {}
+export const _MatSortMixinBase = mixinDisabled(MatSortBase);
+
 /** Container for MatSortables to manage the sort state and provide default sort parameters. */
 @Directive({
   selector: '[matSort]',
-  exportAs: 'matSort'
+  exportAs: 'matSort',
+  inputs: ['disabled: matSortDisabled']
 })
-export class MatSort {
+export class MatSort extends _MatSortMixinBase implements CanDisable, OnChanges, OnDestroy {
   /** Collection of all registered sortables that this directive manages. */
   sortables = new Map<string, MatSortable>();
 
+  /** Used to notify any child components listening to state changes. */
+  _stateChanges = new Subject<void>();
+
   /** The id of the most recently sorted MatSortable. */
   @Input('matSortActive') active: string;
 
@@ -125,6 +144,14 @@ export class MatSort {
     if (nextDirectionIndex >= sortDirectionCycle.length) { nextDirectionIndex = 0; }
     return sortDirectionCycle[nextDirectionIndex];
   }
+
+  ngOnChanges() {
+    this._stateChanges.next();
+  }
+
+  ngOnDestroy() {
+    this._stateChanges.complete();
+  }
 }
 
 /** Returns the sort direction cycle to use given the provided parameters of order and clear. */