mvvm


VUE MVVM-介绍和演示

雨燕双飞 提交于 2020-02-26 01:11:20
MVVM-介绍和演示 easyUI knockout smartclient exit.js MVVM 在Vue中是用什么来实现的? OK,我们来攻克这个题目 首先第一个M,指的是 Model, 也就是** 数据模型 ,其实就是数据, 换到Vue里面,其实指的就是 Vue组件实例中的 data **, 但是这个data 我们从一开始就定义了 它叫 响应式数据 第二个V,指的是View, 也就是** 页面视图 , 换到Vue中也就是 我们的 template 转化成的 DOM对象 ** 第三个 VM, 指的是** ViewModel , 也就是 视图和数据的管理者, 它管理着我们的数据 到 视图变化的工作,换到Vue中 ,它指的就是我们的当前的 Vue实例 , Model数据 和 View 视图通信的一个 桥梁 ** 简单一句话: 数据驱动视图 , 数据变化 =>视图更新 双向 绑定 视图更新 => 数据变化 Vue ==>MVVM => 双向数据绑定 => this.name = '张三 ' React => MVVM => 单向数据绑定 => 只能从数据 => 视图 => this.setState({ name: '张三' }) <!-- 视图 --> <template> <div>{{ message }}</div> </template> <script> //

Android - Can I Databinding programatically? - without layout XML

大憨熊 提交于 2020-02-25 04:47:33
问题 Below is XML equivalent of what I'm trying to achieve, but without XML <Button android:id="@+id/bt_start" android:onClick="@{() -> vm.onClickedStart()}" android:text='@{vm.btStartLbl}' /> so if I have: ConstraintLayout cl = findViewById(R.id.cl); Button btn = new Button(MyActivity.this); btn.setText("How to Data Bind here?"); btn.setOnClickListener(new OnClickListener (){ /* how to databind here? */ }); cl.addView(btn); how to databind it as equivalent as xml above? is it possible? 回答1: For

How to Unit test ViewModel with async initialization in WPF

别等时光非礼了梦想. 提交于 2020-02-25 02:53:09
问题 I have created a sample WPF MVVM project which I now want to Unit test. The viewmodels load the data asynchronously in the constructor: public class CustomerOverviewViewModel { public CustomerOverviewViewModel() { var t = LoadFullCustomerListAsync(); } public async Task LoadFullCustomerListAsync() { List<BL_acc> customers = await Task.Run(() => // Query from db); } } In WPF, this works like a charm. When I want to create a unit test for this viewmodel, I create the object by calling its

Differences and similarities between: ViewModelLocator, ServiceLocator, Dependency Injection

好久不见. 提交于 2020-02-25 02:13:01
问题 I'm confused about the patterns: ViewModelLocator , ServiceLocator , Dependency Injection . The latest conclusion are as follows: ViewModelLocator . The place to connect View and ViewModel . public ViewModelLocator() { SimpleIoc.Default.Register<MainViewModel>(); SimpleIoc.Default.Register<SettingViewModel>(); } public MainViewModel MainViewModel => SimpleIoc.Default.GetInstance<MainViewModel>(); public SettingViewModel SettingViewModel => SimpleIoc.Default.GetInstance<SettingViewModel>(); //

Handle SwiftUI and CoreLocation with MVVM-Pattern

心不动则不痛 提交于 2020-02-22 05:39:28
问题 i am trying to implement SwiftUI and CoreLocation with the MVVM-Pattern . My LocationManager as Helper works fine. But how I can change the properties of my LocationViewModel ? I am implemented my @ObservedObject of the LocationManager in LocationViewModel . Here is my problem. I don't have a idea to implement properties they change on the fly. Nothing is changed in my LocationView. By pressing a Button anything works fine one time. But the LocationViewModel must change there properties on

WPF DataGrid flickering issue

99封情书 提交于 2020-02-22 04:07:49
问题 In WPF, I have a DataGrid bound to a DataView in the ViewModel class. It is a touch panel embedded project, so every time I touch and slide my fingers on the panel it keeps sending me values and saves those values to the DataTable and assigns it to the bound DataView in a way where it can show only 5 or 10 rows (predefined) as the data gets updated. Every time I get a new row I delete the last until the total DataTable row count is 5/10. The issue here is that it is taking longer than usual

WPF DataGrid flickering issue

◇◆丶佛笑我妖孽 提交于 2020-02-22 04:07:15
问题 In WPF, I have a DataGrid bound to a DataView in the ViewModel class. It is a touch panel embedded project, so every time I touch and slide my fingers on the panel it keeps sending me values and saves those values to the DataTable and assigns it to the bound DataView in a way where it can show only 5 or 10 rows (predefined) as the data gets updated. Every time I get a new row I delete the last until the total DataTable row count is 5/10. The issue here is that it is taking longer than usual

WPF DataGrid flickering issue

半腔热情 提交于 2020-02-22 04:02:07
问题 In WPF, I have a DataGrid bound to a DataView in the ViewModel class. It is a touch panel embedded project, so every time I touch and slide my fingers on the panel it keeps sending me values and saves those values to the DataTable and assigns it to the bound DataView in a way where it can show only 5 or 10 rows (predefined) as the data gets updated. Every time I get a new row I delete the last until the total DataTable row count is 5/10. The issue here is that it is taking longer than usual

What is the best approach to assign Data Context using MVVM?

僤鯓⒐⒋嵵緔 提交于 2020-02-17 07:35:41
问题 I was looking for best approach to set data context property. I found three ways Assign data context on View (either on XAML or code behind). Assign data context on ViewModel through constructor. Use some configuration that takes view and view model reference and bind data context on run time through some infrastructure classes. Which is the best option among this in terms of loosely coupled, maintainable? Or Is there any best approach? 回答1: I personally like this approach because it makes me

Wpf multiple listviews with shared selection (MVVM) [duplicate]

北慕城南 提交于 2020-02-16 10:41:15
问题 This question already has answers here : How to bind multiple selection of listview to viewmodel? (9 answers) Sync SelectedItems in a muliselect listbox with a collection in ViewModel (10 answers) Binding SelectedItems of Listview (2 answers) Closed 16 days ago . I have an issue with multiple listviews. I want them to have shared selection and SelectionMode=Extended I managed to find a solution if SelectionMode=Single but it doesn't work for Extended situation Basicly my code looks like this

工具导航Map