Develop Reference

NavigationView Item with extra content on right side

I have a NavigationView in my app. I want to add counters/badges to some of the items. But whatever I do, the badge always stays right next to the label. See the image below (on the top is what I have, on the bottom what I want to achieve)
The code I'm currently using is the following:
<NavigationViewItem Icon="Mail">
<NavigationViewItem.Content>
<RelativePanel HorizontalAlignment="Stretch">
<TextBlock RelativePanel.AlignLeftWithPanel="True">Inbox</TextBlock>
<local:Badge RelativePanel.AlignRightWithPanel="True" BadgeText="30"/> <!-- can be replaced with a simple "TextBlock" -->
</RelativePanel>
</NavigationViewItem.Content>
</NavigationViewItem>
(You can subsitute the Badge control with a simple TextBlock)

The problem is that RelativePanel can't get SplitViewOpenPaneThemeLength automatically. so we need specific the width for RelativePanel. As we known SplitViewOpenPaneThemeLength is 320, and SplitViewCompactPaneThemeLength is 48. so the
width of NavigationViewItem.Content is 320-48 = 272. Please refer the following xaml code.
<RelativePanel HorizontalAlignment="Stretch" Width="{ThemeResource SplitViewOpenPaneThemeLength}">
<TextBlock RelativePanel.AlignLeftWithPanel="True">Inbox</TextBlock>
<TextBlock RelativePanel.AlignRightWithPanel="True" Text="30" Margin="0,0,48,0"/>
<!-- can be replaced with a simple "TextBlock" -->
</RelativePanel>

In WPF, how to add an element to a panel in code-behind, and put it before the last existing element?

I have a StackPanel and I dynamically add images to it. The StackPanel has a Button at the bottom, and I want the images to be above the Button.
How it works currently:
<StackPanel>
<Button />
<!-- Images are added here -->
</StackPanel>
How I want it to work:
<StackPanel>
<!-- Images are added here -->
<Button />
</StackPanel>
How can I achieve that?
Thanks.

Add one more child stackpanel to which add the images.
<StackPanel>
<StackPanel>
<!-- Images are added here -->
</StackPanel>
<Button />
</StackPanel>

This will work:
int index = Stack.Children.Count - 1;
Stack.Children.Insert(index, image);
Then your button is always the last item. It won't matter how many items are in the StackPanel.

Give your stack panel a name (e.g. myPanel)then in your codebehind try this;
myPanel.Children.Insert(0, myNewControl);
The 0 indicates the element within the stackpanel's children, so you could put it where-ever you liked, but obviously 0 is the first element.

Attach attribute to Scrollviewer of Textbox

I need to sync two scroll viewers in WPF, one of which is part of the TextBox item.
I intend on using the method described on CodeProject here:
However, this requires that I can attach attributes to both scrollviewers. One of the scrollviewers is the scrollviewer that comes as part of a textbox.
Code at the moment:
<ScrollViewer Core:ScrollSynchronizer.VerticalScrollGroup="V1">
<UIComponents:LineNumberBox
x:Name="LineBox"
VisibleLines="{Binding ElementName=CodeBox, Path=(UIComponents:VisibleLinesBinder.VisibleLines)}"
Padding="2,10,2,0"
FontSize="14"
Grid.Column="0"
/>
</ScrollViewer>
<UIComponents:SourceCodeBox
x:Name="CodeBox"
Padding="10"
FontSize="14"
Grid.Column="1"
UIComponents:VisibleLinesBinder.ObserveVisibleLines="True"
Core:ScrollSynchronizer.VerticalScrollGroup="V1"
/>
A UIComponents:SourceCodeBox is just a wrapper around a normal WPF Textbox.
Obviously the Core:ScrollSynchronizer.VerticalScrollGroup="V1" on the SourceCodeBox doesnt work? So how would I attach that attribute to the ScrollViewer within it? C# or XAML methods are both fine.
In case it makes any difference this is part of a User Control I am developing.

put the attatched behavior in a style like this:
<UIComponents:SourceCodeBox
x:Name="CodeBox"
Padding="10"
FontSize="14"
Grid.Column="1"
UIComponents:VisibleLinesBinder.ObserveVisibleLines="True"
Core:ScrollSynchronizer.VerticalScrollGroup="V1">
<UIComponents:SourceCodeBox.Resources>
<Style TargetType="ScrollViewer">
<Setter Property="Core:ScrollSynchronizer.VerticalScrollGroup" Value="V1"/>
</Style>
</UIComponents:SourceCodeBox.Resources>
</UIComponents:SourceCodeBox>

Accessing a list picker inside a PanoramaHeader Template

I have a panorama control in which I have create a header template to add a list picker inside it. (Just like the peoples hub to select social accounts)
<DataTemplate x:Key="PanoramaItemHeaderTemplate">
<ContentPresenter>
<StackPanel Height="129">
<TextBlock Text="{Binding}" FontSize="72" Margin="0,7,0,0" />
<toolkit:ListPicker x:Name="listPick" Margin="0,-21,0,0" BorderThickness="0">
<toolkit:ListPickerItem Content="twitter"></toolkit:ListPickerItem>
</toolkit:ListPicker>
</StackPanel>
</ContentPresenter>
</DataTemplate>
The panorama control is inside the MainPage.xaml file and I want to have access to the listpicker from the code behind to be able to populate it, and handle it selection events.
I don't know how to do this. I tried adding the x:name property to the list picker I don't have access to it in the MainPage code behind.
Any idea on how to approach this is very welcomed, thanks!

From what you have now, the quickest way to do what you want is to traverse the visual tree
See here for the implementation:
How to access a specific item in a Listbox with DataTemplate?

You cannot access the ListPicker by x:Name because it is not unambiguous: there is a ListPicker generated for each PanoramaItem in your Panorama. So the first question is, is it really the think you want to do? If so you need to populate it using a binding (ItemSource)

You can access an element inside another resource, consider this example:
<Grid Name="myGrid">
<StackPanel x:Name="stack1">
<TextBlock x:Name="abc"/>
</StackPanel>
</Grid>
We can only access the Grid myGrid in code by default. To get reference to the StackPanel we can do this:
StackPanel myStack=myGrid.FindName("stack1") as Stackpanel;
After that we can get reference to the TextBlock:
TextBlock myTextBlock=myStack.FindName("abc") as TextBlock;
You can modify myTextBlock after that as you may like. You can apply the same technique in your case and it will work.
Hope that helps :).

ControlTemplate

I am quite new to WPF and have a basic question :
Assume the following is xaml declaration in my xaml file
<ContentControl x:Name="interactionActivityContent" Loaded="interactionActivityContent_Loaded">
<shapes:BaseShape.DragThumbTemplate >
<ControlTemplate x:Name="interactionActivityTemplate">
<Grid AllowDrop="True" x:Name="GridTest" >
<Rectangle Name="Interaction" Fill="Yellow" Stroke="Green" StrokeThickness="2" IsHitTestVisible="True" AllowDrop="True"></Rectangle>
<local:DesignerCanvas x:Name="ActivitiesCanvasArea" Margin="1,1,1,1" IsHitTestVisible="True" AllowDrop="True" Background="Blue"></local:DesignerCanvas>
</Grid>
</ControlTemplate>
</shapes:BaseShape.DragThumbTemplate>
*shapes:BaseShape.DragThumbTemplate is coming from some different class.
*DesignerCanvas is my own custom canvas for which I want to set value at run time.
How can I access ActivitiesCanvasArea in my C# code from the code behind file?
Do I need to change the way xaml is declared. I need to apply DragThumbTemplate to my grid so that I can move around grid on main screen.

From http://blogs.msdn.com/b/wpfsdk/archive/2007/03/16/how-do-i-programmatically-interact-with-template-generated-elements-part-i.aspx
If you need to find a named element in the ControlTemplate of myButton1, like the Grid, you can use Template.FindName like so:
// Finding the grid generated by the ControlTemplate of the Button
Grid gridInTemplate = (Grid)myButton1.Template.FindName("grid", myButton1);