dmn-js-boxed-expression/lib/features/keyboard/KeyboardBindings.js

A boxed expression view for dmn-js

import { isUndo, isRedo } from 'diagram-js/lib/features/keyboard/KeyboardUtil';
export class KeyboardBindings {
  static $inject = ['editorActions', 'keyboard'];
  constructor(editorActions, keyboard) {
    this.registerBindings(keyboard, editorActions);
  }

  /**
   * Register available keyboard bindings.
   *
   * @param {Keyboard} keyboard
   * @param {EditorActions} editorActions
   */
  registerBindings(keyboard, editorActions) {
    /**
    * Add keyboard binding if respective editor action
    * is registered.
    *
    * @param {string} action name
    * @param {Function} fn that implements the key binding
    */
    function addListener(action, fn) {
      if (editorActions.isRegistered(action)) {
        keyboard.addListener(fn);
      }
    }

    // undo
    // (CTRL|CMD) + Z
    addListener('undo', function (context) {
      const event = context.keyEvent;
      if (isUndo(event)) {
        editorActions.trigger('undo');
        return true;
      }
    });

    // redo
    // CTRL + Y
    // CMD + SHIFT + Z
    addListener('redo', function (context) {
      const event = context.keyEvent;
      if (isRedo(event)) {
        editorActions.trigger('redo');
        return true;
      }
    });
  }
}
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