Method _handleKeyEvent

src/cdk/menu/menu.ts:72–103

* Handle keyboard events for the Menu. * @param event The keyboard event to be handled.

(event: KeyboardEvent)

   * @param event The keyboard event to be handled.
   */
  _handleKeyEvent(event: KeyboardEvent) {
    const keyManager = this.keyManager;
    switch (event.keyCode) {
      case LEFT_ARROW:
      case RIGHT_ARROW:
        if (!hasModifierKey(event)) {
          event.preventDefault();
          keyManager.setFocusOrigin('keyboard');
          keyManager.onKeydown(event);
        }
        break;

      case ESCAPE:
        if (!hasModifierKey(event)) {
          event.preventDefault();
          this.menuStack.close(this, {
            focusNextOnEmpty: FocusNext.currentItem,
            focusParentTrigger: true,
          });
        }
        break;

      case TAB:
        if (!hasModifierKey(event, 'altKey', 'metaKey', 'ctrlKey')) {
          this.menuStack.closeAll({focusParentTrigger: true});
        }
        break;

      default:
        keyManager.onKeydown(event);
    }
  }

  /**
   * Set focus the either the current, previous or next item based on the FocusNext event.