Method _handleKeydown

src/material/menu/menu.ts:362–391

Handle a keyboard event from the menu, delegating to the appropriate action.

(event: KeyboardEvent)

  /** Handle a keyboard event from the menu, delegating to the appropriate action. */
  _handleKeydown(event: KeyboardEvent) {
    const keyCode = event.keyCode;
    const manager = this._keyManager;

    switch (keyCode) {
      case ESCAPE:
        if (!hasModifierKey(event)) {
          event.preventDefault();
          this.closed.emit('keydown');
        }
        break;
      case LEFT_ARROW:
        if (this.parentMenu && this.direction === 'ltr') {
          this.closed.emit('keydown');
        }
        break;
      case RIGHT_ARROW:
        if (this.parentMenu && this.direction === 'rtl') {
          this.closed.emit('keydown');
        }
        break;
      default:
        if (keyCode === UP_ARROW || keyCode === DOWN_ARROW) {
          manager.setFocusOrigin('keyboard');
        }

        manager.onKeydown(event);
        return;
    }
  }

  /**
   * Focus the first item in the menu.