WPF: How do I get a text box to fill all available horizontal space?-CodePudding

I'm creating a form in WPF. The form has TextBoxes with TextBlocks to their left. A screenshot with GridLines is below:

I want it to look like this (forgive the MS Paint style):

The problem is: the text boxes are really small unless I set the HorizontalAlignment to Stretch, but if I do that, I can't align them to the left. How do I get the Grid containing TextBlock/TextBox to align to the left and make the TextBox fill all available space?

It's trivially easy if I hardcode widths, but that obviously won't work with resizing. I've tried playing with Stack and Dock Panels to hold the Grids with no luck.

I can't use

There are a few problems with your current code. First, using a DockPanel to host the TextBlock/TextBox pairs, and second, no control has Grid.IsSharedSizeScope=true set on it. You also have defined a shared size for the text box column when in reality you just want it to take up all the available space.

Here is some code that achieves the desired layout:

<Grid ShowGridLines="True">
    <Grid.RowDefinitions>
        <RowDefinition Height="*"/>
        <RowDefinition Height="*"/>
    </Grid.RowDefinitions>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="*"/>
        <ColumnDefinition Width="*"/>
    </Grid.ColumnDefinitions>
    <!--Left hand side content goes here-->
    <StackPanel Orientation="Vertical" Grid.Column="1"
                Grid.RowSpan="2"
                Margin="20,0,0,0"
                Grid.IsSharedSizeScope="True" >
        <StackPanel.Resources>
            <Style TargetType="TextBlock">
                <Setter Property="Grid.Column" Value="0"/>
                <Setter Property="Text" Value="Input Name:"/>
                <Setter Property="VerticalAlignment" Value="Center"/>
            </Style>
        </StackPanel.Resources>


        <Border BorderBrush="Blue" BorderThickness="5">
            <Grid ShowGridLines="True" HorizontalAlignment="Stretch">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition SharedSizeGroup="TextBlockColumn"/>
                    <ColumnDefinition Width="*"/>
                </Grid.ColumnDefinitions>
                <TextBlock/>
                <TextBox Grid.Column="1"
                         VerticalAlignment="Center" 
                         Style="{StaticResource FormTextBox}"
                         Margin="5,0,5,0"/>
            </Grid>
        </Border>
        <Border BorderBrush="Red" BorderThickness="5">
            <Grid ShowGridLines="True" HorizontalAlignment="Stretch">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition SharedSizeGroup="TextBlockColumn"/>
                    <ColumnDefinition Width="*"/>
                </Grid.ColumnDefinitions>
                <TextBlock/>
                <TextBox Grid.Column="1"
                         VerticalAlignment="Center" 
                         Style="{StaticResource FormTextBox}"
                         Margin="5,0,5,0"/>
            </Grid>
        </Border>
    </StackPanel>
</Grid>

This code produces:

In reality though, if you're going for maximum usability, you'll want to create your own control for the TextBlock/TextBox, and then you could just put it in an ItemsControl of some kind for dynamic content.