I have a xaml with a TabControl with two tabs. Each of the TabItems has a treeview which has exactly the same code. The bindings, VM etc are exactly same. They work of different data which is handled in my Model depending upon a property. So my VM and View do not need to worry about it.
Is there any way that I can write my treeview and the HierarchicalDataTemplate once and each tab refers instead of duplicating code in the same xaml?
Something like
<TabControl>
<TabItem Header="Tab1">
<Grid>
<!-- Refer to the tree view here -->
</Grid>
</TabItem>
<TabItem Header="Tab2">
<Grid>
<!-- Refer to the tree view here -->
</Grid>
</TabItem>
</TabControl>
But then How to write the treeview and HierarchicalDataTemplate and then refer them?
Define a DataTemplate that contains your TreeView layout and then use ContentPresenter or ContentControl to present it:
<Window.Resources>
<DataTemplate x:Key="TreeTemplate">
<Your TreeViewLayout ...>
</DataTemplate>
</Window.Resources>
...
<TabControl>
<TabItem Header="Tab1">
<ContentControl Content="{Binding}" ContentTemplate="{StaticResource TreeTemplate}" />
</TabItem>
<TabItem Header="Tab2">
<ContentControl Content="{Binding}" ContentTemplate="{StaticResource TreeTemplate}" />
</TabItem>
</TabControl>
Related
I have the following TabControl with 2 default tabitems.
<TabControl>
<TabControl.ItemTemplate>
<DataTemplate>
<ScrollViewer VerticalScrollBarVisibility="Auto" Height="300" Content="{Binding}"/>
</DataTemplate>
</TabControl.ItemTemplate>
<TabItem Header="Conexión"><local:ConnectionSettings/></TabItem>
<TabItem Header="Cuestionario"><local:QuestionEditor/></TabItem>
</TabControl>
The current xaml doesn't apply the ItemTemplate, for that to happen each tabitem would need to be "naked", like this:
<TabControl>
<TabControl.ItemTemplate>
<DataTemplate>
<ScrollViewer VerticalScrollBarVisibility="Auto" Height="300" Content="{Binding}"/>
</DataTemplate>
</TabControl.ItemTemplate>
<!-- The ItemTemplate is only applied if tabitems are not wrapped in TabItem tags -->
<local:ConnectionSettings/>
<local:QuestionEditor/>
</TabControl>
But if I do that, then I can't specify the header.
I would like for every TabItem to be wrapped in a ScrollViewer (as specified in the ItemTemplate), but at the same be able to specify the header.
Is there a way to apply the ItemTemplate to <TabItem Header="MyHeader"/> tags?
ItemTemplate is the template to format the ItemsSource the headers on top of your tab control. ContentTemplate is the template to format the content of the tabs. To wrap your defined content to the scroll viewer, just make use of a new content control inside your template. Here is a minimal sample:
<TabControl>
<TabControl.ContentTemplate>
<DataTemplate>
<ScrollViewer>
<ContentControl Content="{TemplateBinding Property=ContentControl.Content}"/>
</ScrollViewer>
</DataTemplate>
</TabControl.ContentTemplate>
<TabItem>
<Button Content="Button1"/>
</TabItem>
<TabItem>
<Button Content="Button2"/>
</TabItem>
</TabControl>
I have a TabControl in a XAML file like this:
<UserControl d:DesignHeight="300" d:DesignWidth="400">
<TabControl Style="{DynamicResource WizardTabControlStyle}">
<TabItem >
<local:Tab1/>
</TabItem>
<TabItem >
<local:Tab2/>
</TabItem>
<TabItem >
<local:Tab3/>
</TabItem>
</TabControl>
and every tab is defined in another xaml file:
<UserControl d:DesignHeight="450" d:DesignWidth="794">
<DockPanel DataContext="{Binding Model1}">
<GroupBox Header="{concept:Intl Key=Geometry, DefaultText='G1'}" DockPanel.Dock="Top" MinHeight="165">
<Grid>
// Common view
</Grid>
</GroupBox>
<GroupBox DockPanel.Dock="Bottom" Header="{concept:Intl Key=G2, DefaultText='G2'}" DataContext="{Binding G2}" Padding="0,10">
<Grid>
// other stuff
</Grid>
</GroupBox>
</DockPanel>
Other tab views are the same as this.
What I want to do is that define a graphical view (OpenGL) in the TabControl and then in the single tab XAML, I want a reference to that view. Every tab sin the "//Common view" should have the same OpenGL view defined in the Tab Control.
Is that possible?
I encountered a problem when I was developing a WPF application with a TabControl object. I tried to debug and find the problem and finally I've got it, but I didn't find any workaround to it. Here is some explanation:
I used this data grid filtering library (here is a codeproject url), which is the best (from my viewpoint). I want to customize it with the google material design theme and change some graphical features, such as using a toggle button in the first tab header of data gird to hide/show the filtering option.
I created a user control and placed my custom datagrid in it. Then I embedded that control into the tabItem. When I set this control to the first tabItem, everything works correctly. But when I change the user control to the other tabItem, the toggle button does not work.
Here is my main window xaml code that didn't work:
<TabControl x:Name="tabControl">
<TabItem Header="1'st Tab">
<ContentControl DataContext="{Binding Path=DataContext, RelativeSource={RelativeSource AncestorType={x:Type Window}}}">
<Button Content="Do no thing"></Button>
</ContentControl>
</TabItem>
<TabItem Header="2'nd Tab">
<ContentControl DataContext="{Binding Path=DataContext, RelativeSource={RelativeSource AncestorType={x:Type Window}}}">
<local:UserControl1/>
</ContentControl>
</TabItem>
</TabControl>
Note that if I change the order of TabItems, it works well. Does anyone have a suggestion how to solve this problem? Here is my sample project code on Github
Edit: Today, I test my application with "WPF Inspector" to find the structure of visual and logical tree. The behavior was too strange because when I attached "WPF Inspector" to my application, everything started to work. The below GIF is what I did:
When using a ContentControl for a Data-Object, in your case it's the data context, you bind the Content property to the Data-Object and specify the DataTemplate property. In this case the content within DataTemplate will have its DataContext set to your Data-Object.
Here is a working sample:
<TabControl x:Name="tabControl">
<TabItem Header="1'st Tab">
<ContentControl Content="{Binding .}">
<ContentControl.ContentTemplate>
<DataTemplate>
<Button Content="Do no thing"></Button>
</DataTemplate>
</ContentControl.ContentTemplate>
</ContentControl>
</TabItem>
<TabItem Header="2'nd Tab">
<ContentControl Content="{Binding .}">
<ContentControl.ContentTemplate>
<DataTemplate>
<local:UserControl1/>
</DataTemplate>
</ContentControl.ContentTemplate>
</ContentControl>
</TabItem>
</TabControl>
I have a MainWindow.xmal which has two TabItems:
<TabItem Header="Config" ... />
<TabItem Header="Results" ... />
I have a separated Config.xaml file for the Config TabItem which has a ListBox:
<ListBox Name="UrlConfig" ... />
I have another separated Results.xaml file for the Results TabItem which has a TaxtBlock:
<TextBlock Name="Url" .../>
The problem is that I'd like to bind the selected value in the ListBox to the TextBlock. How can I do that? Please help :)
I recomend you to work with MVVM, but if not you can implement it with XAML only:
Use sepparate resource like "Bridge" 'Config' and 'Results'
Config.xaml:
<UserControl x:Key="Config">
<ListBox x:Name="ListBox1" SelectedItem="{Binding Source={StaticResource SelectedValue}, Path=Y, Mode=TwoWay}" >
<System:String>Minsk</System:String>
<System:String>London</System:String>
<System:String>NY</System:String>
</ListBox>
</UserControl>
Results.xaml
<UserControl x:Key="Results">
<Label Name="Url" Content="{Binding Source={StaticResource SelectedValue}, Path=Y}" />
</UserControl>
Code of window with TabControl:
<Window.Resources>
<!--"Bridge" resource, here will be your own type-->
<X x:Key="SelectedValue" Y="Minsk"></X>
</Window.Resources>
<Grid>
<TabControl>
<TabItem Header="Config" Content="{StaticResource ResourceKey=Config}"/>
<TabItem Header="Results" Content="{StaticResource ResourceKey=Results}"/>
</TabControl>
</Grid>
If you're working in mvvm way you can bind those to a property on your viewmodel and set the DataContext for to that viewmodel
I'd like to display the same instance of user control twice. Ive tried doing the following:
<UserControl.Resources>
<Views:MyControl View x:Key="_uc1" MinHeight="300"/>
</UserControl.Resources>
And trying to use it in a TabControl:
<TabControl Grid.Row="3" Grid.Column="1" Grid.ColumnSpan="3" >
<TabItem >
<TabItem.Header>
<TextBlock Text="Header1" FontWeight="13"/>
</TabItem.Header>
<StackPanel >
<ContentControl Content="{StaticResource _uc1}"/>
</StackPanel>
</TabItem>
<TabItem >
<TabItem.Header>
<TextBlock Text="Header2" FontWeight="13"/>
</TabItem.Header>
<StackPanel MinHeight="600" >
<ContentControl Content="{StaticResource _uc1}"/>
</StackPanel>
</TabItem>
</TabControl>
Im getting the error message:
"{"Specified element is already the logical child of another element. Disconnect it first."}"
Is what Im trying to achieve possible?
Thanks,
It's not. As the error indicates, a given object may only be present in a given logical tree once. This helps to ensure that the logical tree remains a tree.
If you're using the MVVM pattern (or are just using DataBinding in general,) then you can bind two different UserControls to the same backing ViewModel/data, so that the controls will behave the same and operate on the same state representation. You'll still need two different controls, though.
In WPF (and Silverlight) a control cannot be in more than one place in the visual tree. What you can do is have two separate instances of the user control, but bind their relevant properties to the same underlying source.
For example, let's say you had a Contact object and you wanted two MyControl instances to refer to the same FullName property.
<UserControl>
<UserControl.Resources>
<my:Contact x:Key="data" FullName="Josh Einstein" />
</UserControl.Resources>
<TabControl DataContext="{StaticResource data}">
<TabItem>
<TabItem.Header>
<TextBlock Text="Header1" FontWeight="13" />
</TabItem.Header>
<StackPanel>
<!-- instance #1 -->
<Views:MyControl FullName="{Binding FullName, Mode=TwoWay}" />
</StackPanel>
</TabItem>
<TabItem>
<TabItem.Header>
<TextBlock Text="Header2" FontWeight="13" />
</TabItem.Header>
<StackPanel>
<!-- instance #2 -->
<Views:MyControl FullName="{Binding FullName, Mode=TwoWay}" />
</StackPanel>
</TabItem>
</TabControl>
</UserControl>
If you just want a single control to appear in multiple places in the visual tree, but not actually be interactive, you can use a VisualBrush to "paint" onto another control.
You can not have the same control in two places, but you make it jump, see this answer of mine for an example of how to do that.