chore(table): add expandable rows demo (angular#11506)

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

@@ -29,5 +29,6 @@ export class TableDemo {
     'table-row-context',
     'table-selection',
     'table-sorting',
+    'table-expandable-rows',
   ];
 }

src/material-examples/table-expandable-rows/table-expandable-rows-example.css

@@ -0,0 +1,46 @@
+table {
+  width: 100%;
+}
+
+tr.example-detail-row {
+  height: 0;
+}
+
+tr.example-element-row:not(.example-expanded-row):hover {
+  background: #f5f5f5;
+}
+
+tr.example-element-row:not(.example-expanded-row):active {
+  background: #efefef;
+}
+
+.example-element-row td {
+  border-bottom-width: 0;
+}
+
+.example-element-detail {
+  overflow: hidden;
+  display: flex;
+}
+
+.example-element-diagram {
+  min-width: 80px;
+  border: 2px solid black;
+  padding: 8px;
+  font-weight: lighter;
+  margin: 8px 0;
+  height: 104px;
+}
+
+.example-element-symbol {
+  font-weight: bold;
+  font-size: 48px;
+}
+
+.example-element-description {
+  padding: 16px;
+}
+
+.example-element-description-attribution {
+  opacity: 0.5;
+}

src/material-examples/table-expandable-rows/table-expandable-rows-example.html

@@ -0,0 +1,35 @@
+<table mat-table
+       [dataSource]="dataSource" multiTemplateDataRows
+       class="mat-elevation-z8">
+  <ng-container matColumnDef="{{column}}" *ngFor="let column of columnsToDisplay">
+    <th mat-header-cell *matHeaderCellDef> {{column}} </th>
+    <td mat-cell *matCellDef="let element"> {{element[column]}} </td>
+  </ng-container>
+
+  <!-- Expanded Content Column - The detail row is made up of this one column that spans across all columns -->
+  <ng-container matColumnDef="expandedDetail">
+    <td mat-cell *matCellDef="let element" [attr.colspan]="columnsToDisplay.length">
+      <div class="example-element-detail"
+           [@detailExpand]="element == expandedElement ? 'expanded' : 'collapsed'">
+        <div class="example-element-diagram">
+          <div class="example-element-position"> {{element.position}} </div>
+          <div class="example-element-symbol"> {{element.symbol}} </div>
+          <div class="example-element-name"> {{element.name}} </div>
+          <div class="example-element-weight"> {{element.weight}} </div>
+        </div>
+        <div class="example-element-description">
+          {{element.description}}
+          <span class="example-element-description-attribution"> -- Wikipedia </span>
+        </div>
+      </div>
+    </td>
+  </ng-container>
+
+  <tr mat-header-row *matHeaderRowDef="columnsToDisplay"></tr>
+  <tr mat-row *matRowDef="let element; columns: columnsToDisplay;"
+      class="example-element-row"
+      [class.example-expanded-row]="expandedElement === element"
+      (click)="expandedElement = element">
+  </tr>
+  <tr mat-row *matRowDef="let row; columns: ['expandedDetail']" class="example-detail-row"></tr>
+</table>

src/material-examples/table-expandable-rows/table-expandable-rows-example.ts

@@ -0,0 +1,113 @@
+import {Component} from '@angular/core';
+import {animate, state, style, transition, trigger} from '@angular/animations';
+
+/**
+ * @title Table with expandable rows
+ */
+@Component({
+  selector: 'table-expandable-rows-example',
+  styleUrls: ['table-expandable-rows-example.css'],
+  templateUrl: 'table-expandable-rows-example.html',
+  animations: [
+    trigger('detailExpand', [
+      state('collapsed', style({height: '0px', minHeight: '0', display: 'none'})),
+      state('expanded', style({height: '*'})),
+      transition('expanded <=> collapsed', animate('225ms cubic-bezier(0.4, 0.0, 0.2, 1)')),
+    ]),
+  ],
+})
+export class TableExpandableRowsExample {
+  dataSource = ELEMENT_DATA;
+  columnsToDisplay = ['name', 'weight', 'symbol', 'position'];
+  expandedElement: PeriodicElement;
+}
+
+export interface PeriodicElement {
+  name: string;
+  position: number;
+  weight: number;
+  symbol: string;
+  description: string;
+}
+
+const ELEMENT_DATA: PeriodicElement[] = [
+  {
+    position: 1,
+    name: 'Hydrogen',
+    weight: 1.0079,
+    symbol: 'H',
+    description: `Hydrogen is a chemical element with symbol H and atomic number 1. With a standard
+        atomic weight of 1.008, hydrogen is the lightest element on the periodic table.`
+  }, {
+    position: 2,
+    name: 'Helium',
+    weight: 4.0026,
+    symbol: 'He',
+    description: `Helium is a chemical element with symbol He and atomic number 2. It is a
+        colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas
+        group in the periodic table. Its boiling point is the lowest among all the elements.`
+  }, {
+    position: 3,
+    name: 'Lithium',
+    weight: 6.941,
+    symbol: 'Li',
+    description: `Lithium is a chemical element with symbol Li and atomic number 3. It is a soft,
+        silvery-white alkali metal. Under standard conditions, it is the lightest metal and the
+        lightest solid element.`
+  }, {
+    position: 4,
+    name: 'Beryllium',
+    weight: 9.0122,
+    symbol: 'Be',
+    description: `Beryllium is a chemical element with symbol Be and atomic number 4. It is a
+        relatively rare element in the universe, usually occurring as a product of the spallation of
+        larger atomic nuclei that have collided with cosmic rays.`
+  }, {
+    position: 5,
+    name: 'Boron',
+    weight: 10.811,
+    symbol: 'B',
+    description: `Boron is a chemical element with symbol B and atomic number 5. Produced entirely
+        by cosmic ray spallation and supernovae and not by stellar nucleosynthesis, it is a
+        low-abundance element in the Solar system and in the Earth's crust.`
+  }, {
+    position: 6,
+    name: 'Carbon',
+    weight: 12.0107,
+    symbol: 'C',
+    description: `Carbon is a chemical element with symbol C and atomic number 6. It is nonmetallic
+        and tetravalent—making four electrons available to form covalent chemical bonds. It belongs
+        to group 14 of the periodic table.`
+  }, {
+    position: 7,
+    name: 'Nitrogen',
+    weight: 14.0067,
+    symbol: 'N',
+    description: `Nitrogen is a chemical element with symbol N and atomic number 7. It was first
+        discovered and isolated by Scottish physician Daniel Rutherford in 1772.`
+  }, {
+    position: 8,
+    name: 'Oxygen',
+    weight: 15.9994,
+    symbol: 'O',
+    description: `Oxygen is a chemical element with symbol O and atomic number 8. It is a member of
+         the chalcogen group on the periodic table, a highly reactive nonmetal, and an oxidizing
+         agent that readily forms oxides with most elements as well as with other compounds.`
+  }, {
+    position: 9,
+    name: 'Fluorine',
+    weight: 18.9984,
+    symbol: 'F',
+    description: `Fluorine is a chemical element with symbol F and atomic number 9. It is the
+        lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard
+        conditions.`
+  }, {
+    position: 10,
+    name: 'Neon',
+    weight: 20.1797,
+    symbol: 'Ne',
+    description: `Neon is a chemical element with symbol Ne and atomic number 10. It is a noble gas.
+        Neon is a colorless, odorless, inert monatomic gas under standard conditions, with about
+        two-thirds the density of air.`
+  },
+];