WPF tab control and MVVM selection
The below code sample will create a dynamic tab using MVVM.
XAML
<TabControl Margin="20" x:Name="tabCategory"
ItemsSource="{Binding tabCategory}"
SelectedItem="{Binding SelectedCategory}">
<TabControl.ItemTemplate>
<DataTemplate>
<HeaderedContentControl Header="{Binding TabHeader}"/>
</DataTemplate>
</TabControl.ItemTemplate>
<TabControl.ContentTemplate>
<DataTemplate>
<ContentControl Content="{Binding TabContent}" />
</DataTemplate>
</TabControl.ContentTemplate>
</TabControl>
Modal Class
TabCategoryItem represents each tab item. On two properties, TabHeader will display a tab caption and TabContent contains the content/control to fill in each tab.
Public Class TabCategoryItem
Public Property TabHeader As String
Public Property TabContent As UIElement
End Class
VM Class
Public Class vmClass
Public Property tabCategory As ObjectModel.ObservableCollection(Of TabCategoryItem)
Public Property SelectedCategory As TabCategoryItem
End Class
The below code will fill and bind the content. I am creating two tabs, tab1 and tab2. Both tabs will contain text boxes. You can use any UIelement instead of text boxes.
Dim vm As New vmClass
vm.tabCategory = New ObjectModel.ObservableCollection(Of TabCategoryItem)
'VM.tabCategory colection will create all tabs
vm.tabCategory.Add(New TabCategoryItem() With {.TabHeader = "Tab1", .TabContent = new TextBlock().Text = "My first Tab control1"})
vm.tabCategory.Add(New TabCategoryItem() With {.TabHeader = "Tab2", .TabContent = new TextBlock().Text = "My first Tab control2"})
mywindow.DataContent = vm
Just FYI, I gone through the same issue where I add tabs dynamically using ObservableCollection source but last added Tab do not get selected. I have done same changes what Sheridan said to select Tab as per SelectedIndex. Now last added Tab gets selected but it was not getting focused. So to focus the Tab we have to add set Binding IsAsync property True.
<TabControl ItemsSource="{Binding Workspaces}" Margin="5" SelectedIndex="{Binding TabIndex, Mode=OneWay,UpdateSourceTrigger=PropertyChanged, IsAsync=True}">
If you look at the TabControl
Class page on MSDN, you'll find a property called SelectedIndex
which is an int
. Therefore, simply add an int
property into your view model and Bind
it to the TabControl.SelectedIndex
property and then you can select whichever tab you like at any time from the view model:
<TabControl SelectedIndex="{Binding SelectedIndex}">
...
</TabControl>
UPDATE >>>
Setting a 'startup' tab is even easier using this method:
In view model:
private int selectedIndex = 2; // Set the field to whichever tab you want to start on
public int SelectedIndex { get; set; } // Implement INotifyPropertyChanged here