camunda-modeler/client/lib/external/shortcuts-fix.js

Camunda Modeler for BPMN, DMN and CMMN, based on bpmn.io

'use strict';

var isInputActive = require('util/dom/is-input').active;

var debug = require('debug')('shortcuts');


function ShortcutsFix(app) {

  this.binded = false;

  this.bind = () => {
    debug('adding keyboard shortcuts bindings');

    if (!this.binded) {
      window.addEventListener('keydown', this.handler);

      this.binded = true;

      return debug('added');
    }

    debug('skipped');
  };

  this.unbind = () => {
    debug('removing keyboard shortcuts bindings');

    if (this.binded) {
      window.removeEventListener('keydown', this.handler);

      this.binded = false;

      return debug('removed');
    }

    debug('skipped');
  };

  this.handler = (e) => {
    triggerActionForCtrlKeyEvent(e, 'a', 'selectElements');
    triggerActionForCtrlKeyEvent(e, 'z', 'undo');
    triggerActionForCtrlKeyEvent(e, 'y', 'redo');

    triggerActionForCtrlKeyEvent(e, 'c', 'copy');
    triggerActionForCtrlKeyEvent(e, 'v', 'paste');
  };

  function triggerActionForCtrlKeyEvent(event, key, action) {

    if (event.ctrlKey && ( String.fromCharCode(event.which).toLowerCase() === key && !isInputActive())) {
      debug('triggering "' + action + '" for Ctrl+' + key);

      event.preventDefault();

      app.triggerAction(action);
    }
  }
}


module.exports = ShortcutsFix;