CODEWITHSUNDEEP
c#wpf
Dan
Dan

Reputation: 63

How to anchor groupbox to left but allow groupbox to grow to maxwidth when stretching

I was recently trying to help my friend with a WPF layout issue and I can't seem to figure out how to get it working either and it seems like such a simple thing, so I thought I would tap the wealth of knowledge here :) What he wants is for groupbox1 to autosize to the value of maxwidth and then to stay anchored to the left while the space to the right of the groupbox grows. So to keep this simple I am just going to post some sample code of the situation now :) If anyone has some light to shed on the situation please respond. Thanks everyone!

<Window x:Class="GroupBoxTest.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="147" Width="525">
<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="151*" />
    </Grid.RowDefinitions>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="148" />
        <ColumnDefinition Width="355*" />
    </Grid.ColumnDefinitions>
    <GroupBox Header="groupBox1" Margin="14,12,41,8" Name="groupBox1" MaxWidth="450" Grid.Column="1">
        <Grid />
    </GroupBox>
    <GroupBox Header="groupBox2" Margin="12,12,13,8" Name="groupBox2">
        <Grid />
    </GroupBox>
</Grid>

Upvotes: 6

Views: 1788

Answers (3)

Fredrik Hedblad
Fredrik Hedblad

Reputation: 84657

Setting MaxWidth="450" on the ColumnDefinition will work for the GroupBox.

<ColumnDefinition Width="355*" MaxWidth="450"/>

If the other elements in Column 1 should Stretch further than 450 then you can set HorizontalAlignment="Left" for the GroupBox and bind Width to another element within the same Column.

ActualWidth for a ColumnDefinition isn't a Dependency Property, otherwise we could have used that as the source for the Binding

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="151*" />
    </Grid.RowDefinitions>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="148" />
        <ColumnDefinition Width="355*" />
    </Grid.ColumnDefinitions>
    <Rectangle Name="sizeElement" Fill="Transparent" Margin="14,12,41,8" Grid.Column="1"/>
    <GroupBox Header="groupBox1" Margin="14,12,41,8" Name="groupBox1" MaxWidth="450" Grid.Column="1"
              HorizontalAlignment="Left"
              Width="{Binding ElementName=sizeElement, Path=ActualWidth}">
        <Grid />
    </GroupBox>
    <GroupBox Header="groupBox2" Margin="12,12,13,8" Name="groupBox2">
        <Grid />
    </GroupBox>
</Grid>

Upvotes: 3

Zamboni
Zamboni

Reputation: 8043

Move MaxWidth="450" to the ColumnDefinition and remove it from the GroupBox.

<Grid>
    <Grid.RowDefinitions>
       <RowDefinition Height="*" />
    </Grid.RowDefinitions>
    <Grid.ColumnDefinitions>
       <ColumnDefinition Width="148" />
       <ColumnDefinition Width="*" MaxWidth="450" />
    </Grid.ColumnDefinitions>
    <GroupBox 
        Name="groupBox1" 
        Header="groupBox1"
        Margin="14,12,41,8"
        Grid.Column="1">
    </GroupBox>
    <GroupBox Header="groupBox2" Margin="12,12,13,8" Name="groupBox2">
    </GroupBox>
</Grid>

Upvotes: 1

brunnerh
brunnerh

Reputation: 184441

You could create a workaround using a style like this:

<GroupBox Header="groupBox1" Margin="14,12,41,8" Name="groupBox1" MaxWidth="450" Grid.Column="1">
    <GroupBox.Style>
        <Style TargetType="GroupBox">
             <Style.Triggers>
                <Trigger Property="ActualWidth" Value="450">
                        <Setter Property="Width" Value="450"/>
                        <Setter Property="HorizontalAlignment" Value="Left"/>   
                    </Trigger>       
                 </Style.Triggers>
            </Style>    
        </GroupBox.Style>
    <Grid />
</GroupBox>

Upvotes: 0

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