openproject/app/assets/javascripts/angular/directives/components/single-click.js

//-- copyright
// OpenProject is a project management system.
// Copyright (C) 2012-2014 the OpenProject Foundation (OPF)
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License version 3.
//
// OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
// Copyright (C) 2006-2013 Jean-Philippe Lang
// Copyright (C) 2010-2013 the ChiliProject Team
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
//
// See doc/COPYRIGHT.rdoc for more details.
//++

// TODO move to UI components
angular.module('openproject.uiComponents')

.constant('DOUBLE_CLICK_DELAY', 300)

// Thanks to http://stackoverflow.com/a/20445344
.directive('singleClick', [
  'DOUBLE_CLICK_DELAY',
  '$parse',
  '$timeout',
  function(DOUBLE_CLICK_DELAY, $parse, $timeout) {

  return {
    restrict: 'A',
    link: function(scope, element, attrs) {
      var fn = $parse(attrs.singleClick);
      var clicks = 0, timer = null;

      if (fn) {
        element.on('click', function (event) {
          clicks++;  //count clicks
          if(clicks === 1) {
            timer = $timeout(function() {
              fn(scope, { $event: event });
              clicks = 0;             //after action performed, reset counter
            }, DOUBLE_CLICK_DELAY);
          } else {
            $timeout.cancel(timer);   //prevent single-click action
            clicks = 0;               //after action performed, reset counter
          }
        });
      }
    }
  };
}]);