CODEWITHSUNDEEP
wpfxamllistview
Saulius Valatka
Saulius Valatka

Reputation: 7207

WPF: Setting the text alignment of a GridViewColumn

By default, text is centered in the headers of a ListView (not in the content cells!), I've been struggling to make it left aligned, here's what I've come up with:

<ListView.Resources>
    <DataTemplate x:Key="Templ">
       <TextBlock HorizontalAlignment="Left" Text="{Binding}"/>
    </DataTemplate>
</ListView.Resources>   
...
<GridViewColumn HeaderTemplate="{StaticResource Templ}">File</GridViewColumn>

This does seem to be the right place to alter the appearance of the header, since I can change other properties like Margin, etc., yet it does not respond to the HorizontalAlignment property! I'm guessing the textbox is sized to content and itself centered, thus making the alignment property redundant.

How can I make the text left aligned ?

Upvotes: 9

Views: 27205

Answers (3)

Usman Ali
Usman Ali

Reputation: 818

This may help someone else, as i was struggling too, the best way is to define style for GridViewColumn.

You can set a style to apply to all column headers like below

<GridView>
  <GridView.ColumnHeaderContainerStyle>
      <Style TargetType="{x:Type GridViewColumnHeader}">
        <Setter Property="HorizontalContentAlignment" Value="Left" />
      </Style>
   </GridView.ColumnHeaderContainerStyle>
</GridView>

and You can override the header style for a specific column like below:

<GridViewColumn Header="Something">
   <GridViewColumn.HeaderContainerStyle>
    <Style TargetType="{x:Type GridViewColumnHeader}">
        <Setter Property="HorizontalContentAlignment" Value="Left" />
    </Style>
   </GridViewColumn.HeaderContainerStyle>
</GridViewColumn>

Upvotes: 1

Jake Berger
Jake Berger

Reputation: 5377

Here's an attached property for setting the header's content alignment:

    #region HeaderContentAlignment

    /// <summary>Gets a <see cref="GridViewColumn"/>'s header content alignment.</summary>
    [Category("Common")]
    [AttachedPropertyBrowsableForType(typeof(GridViewColumn))]
    public static HorizontalAlignment GetHeaderContentAlignment(GridViewColumn gridViewColumn)
    {
        return (HorizontalAlignment)gridViewColumn.GetValue(HeaderContentAlignmentProperty);
    }
    /// <summary>Sets a <see cref="GridViewColumn"/>'s header content alignment.</summary>
    public static void SetHeaderContentAlignment(GridViewColumn gridViewColumn, HorizontalAlignment value)
    {
        gridViewColumn.SetValue(HeaderContentAlignmentProperty, value);
    }

    /// <summary>Indicates a <see cref="GridViewColumn"/>'s <see cref="GridViewColumn.HeaderContainerStyle"/>.</summary>
    public static readonly DependencyProperty HeaderContentAlignmentProperty = 
        DependencyProperty.RegisterAttached(
            "HeaderContentAlignment",
            typeof(HorizontalAlignment), // type
            typeof(GridViewExtensions), // containing static class
            new PropertyMetadata(HorizontalAlignment.Center, OnHeaderContentAlignmentChanged)
            );

    private static void OnHeaderContentAlignmentChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        OnHeaderContentAlignmentChanged((GridViewColumn)d, (HorizontalAlignment)e.NewValue);
    }

    private static void OnHeaderContentAlignmentChanged(GridViewColumn gridViewColumn, HorizontalAlignment alignment)
    {
        Style style;
        if (ColumnHeaderAlignments.TryGetValue(alignment, out style) == false)
        {// style NOT created -> create, cache
            style = new Style(typeof(GridViewColumnHeader));
            style.Setters.Add(new Setter(Control.HorizontalContentAlignmentProperty, alignment));
            ColumnHeaderAlignments.Add(alignment, style);
        }
        gridViewColumn.HeaderContainerStyle = style;
    }

    /// <summary>cache [HorizontalAlignment]: [Style]</summary>
    static readonly Dictionary<HorizontalAlignment, Style> ColumnHeaderAlignments = new Dictionary<HorizontalAlignment, Style>(4);

    #endregion HeaderContentAlignment

Upvotes: 4

Quartermeister
Quartermeister

Reputation: 59169

Set the HeaderContainerStyle to a style that sets HorizontalContentAlignment to left: 

<ListView.Resources>
    <DataTemplate x:Key="Templ">
        <TextBlock HorizontalAlignment="Left" Text="{Binding}"/>
    </DataTemplate>
    <Style x:Key="HeaderStyle" TargetType="GridViewColumnHeader">
        <Setter Property="HorizontalContentAlignment" Value="Left"/>
    </Style>
</ListView.Resources>
<ListView.View>
    <GridView>
        <GridView.Columns>
            <GridViewColumn HeaderTemplate="{StaticResource Templ}" HeaderContainerStyle="{StaticResource HeaderStyle}">File</GridViewColumn>
        </GridView.Columns>
    </GridView>
</ListView.View>

Upvotes: 27

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