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POTabControl: Current Content in selected Tabs MVVM
 

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  1. POTabControl: Current Content in selected Tabs MVVM
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    <p>I've got a problem: my professor wrote a program where we have to add some features. There's a WPF with a textbox and a button, and when clicking the button the content of the textbox is sent to the client via <code>MessageQueue</code>.</p> <p>I have to create a new WPF, where the output of the messages should be visible. I've arranged that, but there's another feature: we have to generate a dynamical tab system, where tabs can be added and removed (like in Firefox e.g.). The sent messages should be visible in the opened tab only! Example: I've got 2 tabs (tab1 and tab2) and tab1 is open: I write "text1" into the textbox and click the button, afterwards I open tab2 and I write "text2" into the textbox and click the button. In tab1 i should only see "text1" and in tab2 I should only see "text2".</p> <p>I don't know how to arrange this with MVVM. Using code behind would be easy: <code>myTabs.SelectedIndex.Items.CurrentItem.Text="blabla";</code> - but we have to do it with MVVM.</p> <p>I would be really happy if you could help me! Thanks</p> <pre><code>public class MainViewModels:INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged; private ObservableCollection&lt;AgentModel&gt; _agents; public ObservableCollection&lt;AgentModel&gt; Agents { get { if (_agents == null) { _agents=new ObservableCollection&lt;AgentModel&gt;(); } return _agents; } set { _agents = value; } } public AgentModel SelectedAgent { get { return _selectedAgent; } set { _selectedAgent = value; if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("SelectedAgent")); } } private AgentModel _selectedAgent; private LogicHandler _lh; private Dispatcher _maindispatcher = Dispatcher.CurrentDispatcher; public MainViewModels() { Agents = new ObservableCollection&lt;AgentModel&gt;(); if (!DesignerProperties.GetIsInDesignMode(new DependencyObject())) { ConnectToMsmq(); } } private void ConnectToMsmq() { _lh = new LogicHandler(new MessageInformer(NewMessageReceived)); } private void NewMessageReceived(CoreMessage message) { _maindispatcher.Invoke(() =&gt; { var agent = Agents.FirstOrDefault(x =&gt; x.Host == message.Source); //foreach(var x in Agents) if (agent == null) { agent = new AgentModel { Host = message.Source, Name = message.Source, Time = message.Date, }; Agents.Add(agent); } agent.Messages.Add(message.Data); }); } </code></pre> <p>......</p> <pre><code>&lt;Window x:Class="CoreOutputWpf.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:vm="clr-namespace:CoreOutputWpf.Viewmodels" Title="MainWindow" Height="350" Width="800"&gt; &lt;Window.DataContext&gt; &lt;vm:MainViewModels/&gt; &lt;/Window.DataContext&gt; &lt;Grid&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="0.7*"/&gt; &lt;ColumnDefinition Width="0.3*"/&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;Canvas Grid.Column="0"&gt; &lt;TabControl Margin="20,0,0,0" Name="mainTabs"&gt; &lt;TabItem x:Name="tab0" Width="60" Selector.IsSelected="True" Header="tab0" /&gt; &lt;/TabControl&gt; &lt;Button Name="btnplus" Content="+" Click="btnplus_Click_1" /&gt; &lt;x:Code&gt; private void btnplus_Click_1(object sender, RoutedEventArgs e) { int numb = mainTabs.Items.Count; numb++; mainTabs.Items.Add("tab "+numb+""); tabi.Text = mainTabs.SelectedIndex.ToString(); } &lt;/x:Code&gt; &lt;StackPanel Margin="20,50,0,0"&gt; &lt;TextBlock Text="{Binding SelectedAgent.Host}"/&gt; &lt;TextBlock Text="{Binding SelectedAgent.Time}"/&gt; &lt;ListBox ItemsSource="{Binding SelectedAgent.Messages}"/&gt; &lt;TextBlock Name="tabi"/&gt; &lt;/StackPanel&gt; &lt;/Canvas&gt; &lt;Grid Grid.Column="1"&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition Height="Auto"/&gt; &lt;RowDefinition Height="Auto"/&gt; &lt;RowDefinition Height="*"/&gt; &lt;/Grid.RowDefinitions&gt; &lt;Border Grid.Row="0" Background="SteelBlue"&gt; &lt;TextBlock HorizontalAlignment="Center" Margin="10" FontSize="30" Text="Agents"/&gt; &lt;/Border&gt; &lt;TextBox Grid.Row="1" Margin="5"/&gt; &lt;DataGrid Grid.Row="2" Margin="5" ItemsSource="{Binding Agents}" SelectedItem="{Binding SelectedAgent}"/&gt; &lt;/Grid&gt; &lt;/Grid&gt; </code></pre> <p></p>
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    1. USFederico Berasategui
    1. USuser2262098
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    1. COI would start by cleaning up that code, moving the non-VM related stuff (MSMQ or whatever) out of the ViewModel to a separate class. Then wrapping the calls to `PropertyChanged` into a single method for reuse. Your code looks really bad. And Please, remove that `<x:Code>` stuff from the XAML.
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      1. POTabControl: Current Content in selected Tabs MVVM
      1. USFederico Berasategui
    2. COthe following syntax: `return _agents ?? (_agents = new ObservableCollection<AgentModel>));` is really preferable in the `getter` of the `ObservableCollection`.
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      1. POTabControl: Current Content in selected Tabs MVVM
      1. USFederico Berasategui
 

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