WPF rounded corner textbox

Question

I don't know WPF and am now learning it. I was looking for rounded corners TextBox in WPF. So I searched Google and found a piece of XAML :

 <!–Rounded Corner TextBoxes–>
<ControlTemplate x:Key=”RoundTxtBoxBaseControlTemplate” TargetType=”{x:Type Control}”>
<Border Background=”{TemplateBinding Background}” x:Name=”Bd” BorderBrush=”{TemplateBinding BorderBrush}”
BorderThickness=”{TemplateBinding BorderThickness}” CornerRadius=”6″>
<ScrollViewer x:Name=”PART_ContentHost”/>
</Border>
<ControlTemplate.Triggers>
<Trigger Property=”IsEnabled” Value=”False”>
<Setter Property=”Background” Value=”{DynamicResource {x:Static SystemColors.ControlBrushKey}}” TargetName=”Bd”/>
<Setter Property=”Foreground” Value=”{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}”/>
</Trigger>
<Trigger Property=”Width” Value=”Auto”>
<Setter Property=”MinWidth” Value=”100″/>
</Trigger>
<Trigger Property=”Height” Value=”Auto”>
<Setter Property=”MinHeight” Value=”20″/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>

So please tell me where to paste this XAML. Please help me in detail. I am a beginner in WPF.

Answer 1

In WPF you can modify or recreate the look and feel of controls. So if your example what they have done is they changed the appearance of the TextBox by modifying the ControlTemplate of the existing TextBox. So to see and explore the piece of code just use the below code

<Window x:Class="WpfApplication4.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Height="300" Width="300">
<Window.Resources>
    <ControlTemplate x:Key="TextBoxBaseControlTemplate" TargetType="{x:Type TextBoxBase}">
        <Border Background="{TemplateBinding Background}" 
                x:Name="Bd" BorderBrush="Black"
                BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="10"> 
            <ScrollViewer x:Name="PART_ContentHost"/>
        </Border>
        <ControlTemplate.Triggers>
            <Trigger Property="IsEnabled" Value="False">
                <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}" TargetName="Bd"/>
                <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
            </Trigger>
            <Trigger Property="Width" Value="Auto">
                <Setter Property="MinWidth" Value="100"/>
            </Trigger>
            <Trigger Property="Height" Value="Auto">
                <Setter Property="MinHeight" Value="20"/>
            </Trigger>
        </ControlTemplate.Triggers>
    </ControlTemplate>
</Window.Resources>
<Grid>
    <TextBox Template="{StaticResource TextBoxBaseControlTemplate}" Height="25" Margin="5"></TextBox>
</Grid>

So we have declared a static resource in the Resource section of the Window and we have used the Resource TextBoxBaseControlTemplate in the Template property of the TextBox as Template="{StaticResource TextBoxBaseControlTemplate}" .

Templates to Customize WPF Controls just refere this document to get an idea

http://msdn.microsoft.com/en-us/magazine/cc163497.aspx

Answer 2

@Smolla had a much better answer in his comment on @Daniel Casserly's answer:

<TextBox Text="TextBox with CornerRadius">
  <TextBox.Resources>
    <Style TargetType="{x:Type Border}">
      <Setter Property="CornerRadius" Value="3"/>
    </Style>
  </TextBox.Resources>
</TextBox>

If you want all the borders of TextBoxes and ListBoxes to have rounded corners, put the style into your Window's or App's <Resources>.

Answer 3

You can change all textboxes to have rounded corners by using the following style:

<Style TargetType="{x:Type TextBox}">
  <Style.Resources>
    <Style TargetType="{x:Type Border}">
      <Setter Property="CornerRadius" Value="3" />
    </Style>
  </Style.Resources>
</Style>

Inspired by the following answer: https://stackoverflow.com/a/13858357/3387453

Answer 4

this question is well discussed at msdn: http://social.msdn.microsoft.com/forums/en-US/wpf/thread/549775ed-1c2a-4911-9078-d9c724294fb3/

Try the solutions there, they are in quite a lot of detail and certainly enough detail for you to know where to put the code.

Answer 5

Just set BorderThicknessof textbox to zero add a border around textbox.

 <Border BorderThickness="1" BorderBrush="Black" CornerRadius="10" Padding="2"
        HorizontalAlignment="Center" VerticalAlignment="Center">
        <TextBox Text="Hello ! " BorderThickness="0"/>
 </Border>

Output is as shown in image!

Answer 6

You can use attached properties for setting TextBox border radius (also the same will work for buttons).

Create class for attached property

public class CornerRadiusSetter
{
    public static CornerRadius GetCornerRadius(DependencyObject obj) => (CornerRadius)obj.GetValue(CornerRadiusProperty);

    public static void SetCornerRadius(DependencyObject obj, CornerRadius value) => obj.SetValue(CornerRadiusProperty, value);

    public static readonly DependencyProperty CornerRadiusProperty =
        DependencyProperty.RegisterAttached(nameof(Border.CornerRadius), typeof(CornerRadius),
            typeof(CornerRadiusSetter), new UIPropertyMetadata(new CornerRadius(), CornerRadiusChangedCallback));

    public static void CornerRadiusChangedCallback(object sender, DependencyPropertyChangedEventArgs e)
    {
        Control control = sender as Control;

        if (control == null) return;

        control.Loaded -= Control_Loaded;
        control.Loaded += Control_Loaded;
    }

    private static void Control_Loaded(object sender, EventArgs e)
    {
        Control control = sender as Control;

        if (control == null || control.Template == null) return;

        control.ApplyTemplate();

        Border border = control.Template.FindName("border", control) as Border;

        if (border == null) return;

        border.CornerRadius = GetCornerRadius(control);
    }
}

Then you can use attached property syntax to style multiple textboxes without style duplicates:

<TextBox local:CornerRadiusSetter.CornerRadius="10" />
<TextBox local:CornerRadiusSetter.CornerRadius="5, 0, 0, 5" />
<TextBox local:CornerRadiusSetter.CornerRadius="10, 4, 18, 7" />