Mobile Angular UI - 拖放

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拖放功能允许您通过抓取 HTML 元素并将其拖放到另一个位置来控制该元素。

要在 Mobile Angular UI 中使用拖放功能，您需要添加手势模块。

首先，将 JavaScript 文件添加到 index.html 中，如下所示：

<script src="node_modules/mobile-angular-ui/dist/js/mobile-angular-ui.gestures.min.js"></script>

然后，在 app.js 中将手势模块添加为依赖项，如下所示：

var app=angular.module('myFirstApp', [
   'ngRoute',
   'mobile-angular-ui',
   'mobile-angular-ui.gestures'
]);

我们需要创建一个自定义指令来拖动项目，使用 $drag 模块。

使用 $drag 模块的语法如下：

$drag.bind(element, dragOptions, touchOptions);

参数

element - 您要拖动的 HTML 元素。

dragOptions - 它是一个包含以下详细信息的对象：

var dragOptions= {
   transform: $drag.TRANSLATE_BOTH,
   start: function(dragInfo, event){},
   end: function(dragInfo, event){},
   move: function(dragInfo, event){},
   cancel: function(dragInfo, event){}
};

对于transform，您可以使用以下选项：

$drag.NULL_TRANSFORM - 元素没有变换移动。

$drag.TRANSLATE_BOTH - 元素将在 x 和 y 轴上移动。

$drag.TRANSLATE_HORIZONTAL - 元素将在 x 轴上移动。

$drag.TRANSLATE_UP - 元素将在负 y 轴上移动。

$drag.TRANSLATE_DOWN - 元素将在正 y 轴上移动。

$drag.TRANSLATE_LEFT - 元素将在负 x 轴上移动。

$drag.TRANSLATE_RIGHT - 元素将在正 x 轴上移动。

$drag.TRANSLATE_VERTICAL - 元素将在 y 轴上移动。

$drag.TRANSLATE_INSIDE - 它使用如下所示的函数：

{
   transform: $drag.TRANSLATE_INSIDE(myElement)
}

start、end、move、cancel 是带有draginfo和事件详细信息作为参数的函数。

draginfo - 它是 $touch 模块的扩展版本。它具有以下详细信息：

originalTransform - 绑定 $drag 之前相对于 CSS transform 的 $transform 对象。

originalRect - 绑定任何拖动操作之前绑定元素的边界客户端矩形。

startRect - 在开始事件中注册的绑定元素的边界客户端矩形。

startTransform - 开始事件时的 $transform。

rect - 绑定元素的当前边界客户端矩形。

transform - 当前的 $transform。

reset - 将元素恢复到 originalTransform 的函数。

undo - 将元素恢复到 startTransform 的函数。

touchOptions - 要传递给底层 $touch 服务的选项对象。

在 src/js/app.js 中使用 $drag 模块创建指令，如下所示：

app.directive('dragItem', ['$drag', function($drag) {
   return {
      controller: function($scope, $element) {
         $drag.bind($element,
            {
               transform: $drag.TRANSLATE_BOTH,
               end: function(drag) {
                  drag.reset();
               }
            },
            {
               sensitiveArea: $element.parent()
            }
         );
      }
   };
}]);

让我们看看一个拖动元素的工作示例：

Index.html

<!DOCTYPE html>
<html>
   <head>
      <meta charset="utf-8" />
      <title>Mobile Angular UI Demo</title>
      <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
      <meta name="apple-mobile-web-app-capable" content="yes" />
      <meta name="viewport" content="user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimal-ui" />
      <meta name="apple-mobile-web-app-status-bar-style" content="yes" />
      <link rel="shortcut icon" href="/assets/img/favicon.png" type="image/x-icon" />
      <link rel="stylesheet" href="node_modules/mobile-angular-ui/dist/css/mobile-angular-ui-hover.min.css" />
      <link rel="stylesheet" href="node_modules/mobile-angular-ui/dist/css/mobile-angular-ui-base.min.css" />
      <link rel="stylesheet" href="node_modules/mobile-angular-ui/dist/css/mobile-angular-ui-desktop.min.css" />
      <script src="node_modules/angular/angular.min.js"></script>
      <script src="node_modules/angular-route/angular-route.min.js"></script>
      <script src="node_modules/mobile-angular-ui/dist/js/mobile-angular-ui.min.js"></script>
      <script src="node_modules/angular-route/angular-route.min.js"></script>
      <script src="node_modules/mobile-angular-ui/dist/js/mobile-angular-ui.gestures.min.js"></script>
      <link rel="stylesheet" href="src/css/app.css" />
      <script src="src/js/app.js"></script>
   </head>
   <body ng-app="myFirstApp" ng-controller="MainController">
      
      <!-- Sidebars -->
      <div class="sidebar sidebar-left">
         <div class="scrollable">
            <h1 class="scrollable-header app-name">Tutorials</h1>
            <div class="scrollable-content">
               <div class="list-group" ui-turn-off='uiSidebarLeft'>
                  <a class="list-group-item" href="/">Home Page </a>
                     <a class="list-group-item" href="#/academic"><i class="fa fa-caret-right"></i>Academic Tutorials </a>
                     <a class="list-group-item" href="#/bigdata"><i class="fa fa-caret-right"></i>Big Data & Analytics </a>
                     <a class="list-group-item" href="#/computerProg"><i class="fa fa-caret-right"></i>Computer Programming </a>
                     <a class="list-group-item" href="#/computerscience"><i class="fa fa-caret-right"></i>Computer Science </a>
                     <a class="list-group-item" href="#/databases"><i class="fa fa-caret-right"></i>Databases </a>
                     <a class="list-group-item" href="#/devops"><i class="fa fa-caret-right"></i>DevOps </a>
                  </div>
               </div>
            </div>
         </div>
         <div class="sidebar sidebar-right">
            <div class="scrollable">
               <h1 class="scrollable-header app-name">eBooks</h1>
               <div class="scrollable-content">
                  <div class="list-group" ui-toggle="uiSidebarRight">
                     <a class="list-group-item" href="#/php"><i class="fa fa-caret-right"></i>PHP </a>
                     <a class="list-group-item" href="#/Javascript"><i class="fa fa-caret-right"></i>Javascript </a>
                  </div>
               </div>
            </div>
      </div>
      <div class="app">
         <div class="navbar navbar-app navbar-absolute-top">
            <div class="navbar-brand navbar-brand-center" ui-yield-to="title">
               TutorialsPoint
            </div>
            <div class="btn-group pull-left">
               <div ui-toggle="uiSidebarLeft" class="btn sidebar-left-toggle">
                  <i class="fa fa-th-large "></i> Tutorials
               </div>
            </div>
            <div class="btn-group pull-right" ui-yield-to="navbarAction">
               <div ui-toggle="uiSidebarRight" class="btn sidebar-right-toggle">
                  <i class="fal fa-search"></i> eBooks
               </div>
            </div>
         </div>
         <div class="navbar navbar-app navbar-absolute-bottom">
            <div class="btn-group justified">
               <a ui-turn-on="aboutus_modal" class="btn btn-navbar"><i class="fal fa-globe"></i> About us</a>
               <a ui-turn-on="contactus_overlay" class="btn btn-navbar"><i class="fal fa-map-marker-alt"></i> Contact us</a>
            </div>
         </div>

         <!-- App body -->
         <div class='app-body'>
            <div class='app-content'>
               <ng-view></ng-view>
            </div>
         </div>
      </div><!-- ~ .app -->
      <!-- Modals and Overlays -->
      <div ui-yield-to="modals"></div>
   </body>
</html>

src/js/app.js

/* eslint no-alert: 0 */

'use strict';
//
// Here is how to define your module
// has dependent on mobile-angular-ui
//
var app=angular.module('myFirstApp', [
   'ngRoute',
   'mobile-angular-ui',
   'mobile-angular-ui.gestures'
]);
app.config(function($routeProvider, $locationProvider) {
   $routeProvider
   .when("/", {
      templateUrl : "src/home/home.html"
   });
   $locationProvider.html5Mode({enabled:true, requireBase:false});
});
app.directive('dragItem', ['$drag', function($drag) {
   return {
      controller: function($scope, $element) {
         $drag.bind($element, 
            {
               transform: $drag.TRANSLATE_BOTH,end: function(drag) {
                  drag.reset();
               }
            },
            {
               sensitiveArea: $element.parent()
            }
         );
      }
   };
}]);
app.controller('MainController', function($rootScope, $scope, $routeParams) {
   $scope.msg="Welcome to Tutorialspoint!"
   $scope.js="JavaScript is a lightweight, interpreted programming language. It is designed 
   for creating network-centric applications. It is 
   complimentary to and integrated with Java. 
   JavaScript is very easy to implement because it 
   is integrated with HTML. It is open and cross-platform.";
   $scope.angularjs="AngularJS is a very powerful 
   JavaScript Framework. It is used in Single Page 
   Application (SPA) projects. It extends HTML DOM 
   with additional attributes and makes it more 
   responsive to user actions. AngularJS is open 
   source, completely free, and used by thousands of 
   developers around the world. It is licensed under the Apache license version 2.0.";
   $scope.reactjs="React is a front-end library 
   developed by Facebook. It is used for handling 
   the view layer for web and mobile apps. ReactJS 
   allows us to create reusable UI components. It is 
   currently one of the most popular JavaScript 
   libraries and has a strong foundation and large community behind it.";
});

拖动元素添加到 src/home/home.html 中：

<div style="height: 100%; width: 100%; padding: 40px;">
   <div style="height: 100%; width: 100%; border: 1px solid #444; position: relative;">
      <div drag-Item>
         <img src="src/img/test.png" width="100" height="100" />
      </div>
   </div>
</div>

使用图像进行拖动，如下所示：

Drag

浏览器中的显示如下：

Drop

您可以在 UI 中拖动图像，并且一旦释放鼠标，它将重置回原始位置，因为我们在end 函数中使用了drag.reset()。

$drag.bind($element, {
      transform: $drag.TRANSLATE_BOTH,
      end: function(drag) {
         drag.reset();
      }
   },
   {
      sensitiveArea: $element.parent()
   }
);
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