fix(list): don't select disabled options when pressing ctrl + a (#18885)

Fixes disabled options being selected when the user presses ctrl + a. Selecting disabled options is still supported through `selectAll`.

(cherry picked from commit 77f65e3)

Author: crisbeto

src/material/list/selection-list.spec.ts

@@ -494,6 +494,7 @@ describe('MatSelectionList without forms', () => {
     });
 
     it('should select all items using ctrl + a', () => {
+      listOptions.forEach(option => option.componentInstance.disabled = false);
       const event = createKeyboardEvent('keydown', A, selectionList.nativeElement);
       Object.defineProperty(event, 'ctrlKey', {get: () => true});
 
@@ -505,6 +506,23 @@ describe('MatSelectionList without forms', () => {
       expect(listOptions.every(option => option.componentInstance.selected)).toBe(true);
     });
 
+    it('should not select disabled items when pressing ctrl + a', () => {
+      const event = createKeyboardEvent('keydown', A, selectionList.nativeElement);
+      Object.defineProperty(event, 'ctrlKey', {get: () => true});
+
+      listOptions.slice(0, 2).forEach(option => option.componentInstance.disabled = true);
+      fixture.detectChanges();
+
+      expect(listOptions.map(option => option.componentInstance.selected))
+          .toEqual([false, false, false, false, false]);
+
+      dispatchEvent(selectionList.nativeElement, event);
+      fixture.detectChanges();
+
+      expect(listOptions.map(option => option.componentInstance.selected))
+          .toEqual([false, false, true, true, true]);
+    });
+
     it('should select all items using ctrl + a if some items are selected', () => {
       const event = createKeyboardEvent('keydown', A, selectionList.nativeElement);
       Object.defineProperty(event, 'ctrlKey', {get: () => true});
@@ -617,6 +635,20 @@ describe('MatSelectionList without forms', () => {
       expect(list.options.toArray().every(option => option.selected)).toBe(true);
     });
 
+    it('should be able to select all options, even if they are disabled', () => {
+      const list: MatSelectionList = selectionList.componentInstance;
+
+      list.options.forEach(option => option.disabled = true);
+      fixture.detectChanges();
+
+      expect(list.options.toArray().every(option => option.selected)).toBe(false);
+
+      list.selectAll();
+      fixture.detectChanges();
+
+      expect(list.options.toArray().every(option => option.selected)).toBe(true);
+    });
+
     it('should be able to deselect all options', () => {
       const list: MatSelectionList = selectionList.componentInstance;
 
@@ -629,6 +661,21 @@ describe('MatSelectionList without forms', () => {
       expect(list.options.toArray().every(option => option.selected)).toBe(false);
     });
 
+    it('should be able to deselect all options, even if they are disabled', () => {
+      const list: MatSelectionList = selectionList.componentInstance;
+
+      list.options.forEach(option => option.toggle());
+      expect(list.options.toArray().every(option => option.selected)).toBe(true);
+
+      list.options.forEach(option => option.disabled = true);
+      fixture.detectChanges();
+
+      list.deselectAll();
+      fixture.detectChanges();
+
+      expect(list.options.toArray().every(option => option.selected)).toBe(false);
+    });
+
     it('should update the list value when an item is selected programmatically', () => {
       const list: MatSelectionList = selectionList.componentInstance;
 

src/material/list/selection-list.ts

@@ -550,7 +550,8 @@ export class MatSelectionList extends _MatSelectionListMixinBase implements CanD
         // The "A" key gets special treatment, because it's used for the "select all" functionality.
         if (keyCode === A && this.multiple && hasModifierKey(event, 'ctrlKey') &&
             !manager.isTyping()) {
-          this.options.find(option => !option.selected) ? this.selectAll() : this.deselectAll();
+          const shouldSelect = this.options.some(option => !option.disabled && !option.selected);
+          this._setAllOptionsSelected(shouldSelect, true);
           event.preventDefault();
         } else {
           manager.onKeydown(event);
@@ -663,13 +664,13 @@ export class MatSelectionList extends _MatSelectionListMixinBase implements CanD
    * Sets the selected state on all of the options
    * and emits an event if anything changed.
    */
-  private _setAllOptionsSelected(isSelected: boolean) {
+  private _setAllOptionsSelected(isSelected: boolean, skipDisabled?: boolean) {
     // Keep track of whether anything changed, because we only want to
     // emit the changed event when something actually changed.
     let hasChanged = false;
 
     this.options.forEach(option => {
-      if (option._setSelected(isSelected)) {
+      if ((!skipDisabled || !option.disabled) && option._setSelected(isSelected)) {
         hasChanged = true;
       }
     });