Include a Button in a TextBox

Question

I want to add a little Button, which removes all the text in the TextBox. Is it possible to put this "Remove"-Button into the TextBox (like in the iPhone Textboxs)?

I hope after your help it looks like that:

I played something with the controltemplate but didn't get the wished result.

One way to solve this problem could be to use negative margins of the button, but i think that isn't a clean solution.

Thank you!

Answer 1

Got something using interactivity, but you probably can manage without:

<LinearGradientBrush x:Key="TextBoxBorder" EndPoint="0,20" MappingMode="Absolute" StartPoint="0,0">
    <GradientStop Color="#ABADB3" Offset="0.05" />
    <GradientStop Color="#E2E3EA" Offset="0.07" />
    <GradientStop Color="#E3E9EF" Offset="1" />
</LinearGradientBrush>
<Style x:Key="ExtendedTextBoxTemplate" BasedOn="{x:Null}" TargetType="{x:Type TextBox}">
    <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}" />
    <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.WindowBrushKey}}" />
    <Setter Property="BorderBrush" Value="{StaticResource TextBoxBorder}" />
    <Setter Property="BorderThickness" Value="1" />
    <Setter Property="Padding" Value="1" />
    <Setter Property="AllowDrop" Value="true" />
    <Setter Property="FocusVisualStyle" Value="{x:Null}" />
    <Setter Property="ScrollViewer.PanningMode" Value="VerticalFirst" />
    <Setter Property="Stylus.IsFlicksEnabled" Value="False" />
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type TextBox}">
                <!-- Here i just wrap the content in a grid and place a button on the right, needs to be styled though -->
                <Grid>
                    <Microsoft_Windows_Themes:ListBoxChrome x:Name="Bd"
                            BorderBrush="{TemplateBinding BorderBrush}"
                            BorderThickness="{TemplateBinding BorderThickness}"
                            Background="{TemplateBinding Background}"
                            RenderMouseOver="{TemplateBinding IsMouseOver}"
                            RenderFocused="{TemplateBinding IsKeyboardFocusWithin}" SnapsToDevicePixels="true">
                        <ScrollViewer x:Name="PART_ContentHost"
                                SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
                    </Microsoft_Windows_Themes:ListBoxChrome>
                    <Button Content="X" HorizontalAlignment="Right">
                        <i:Interaction.Triggers>
                            <i:EventTrigger EventName="Click">
                                <ta:ClearTextAction
                                        Target="{Binding RelativeSource={RelativeSource TemplatedParent}}" />
                            </i:EventTrigger>
                        </i:Interaction.Triggers>
                    </Button>
                </Grid>
                <ControlTemplate.Triggers>
                    <Trigger Property="IsEnabled" Value="false">
                        <Setter Property="Background" TargetName="Bd"
                                Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}" />
                        <Setter Property="Foreground"
                                Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}" />
                    </Trigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

class ClearTextAction : TriggerAction<Button>
{
    public static readonly DependencyProperty TargetProperty =
            DependencyProperty.Register("Target", typeof(TextBox), typeof(ClearTextAction), new UIPropertyMetadata(null));
    public TextBox Target
    {
        get { return (TextBox)GetValue(TargetProperty); }
        set { SetValue(TargetProperty, value); }
    }

    protected override void Invoke(object parameter)
    {
        Target.Clear();
    }
}

You could make the button only show upon TextBox-MouseOver by adding this style to it:

<Button.Style>
    <Style TargetType="{x:Type Button}">
        <Setter Property="Visibility" Value="Hidden" />
        <Style.Triggers>
            <DataTrigger
                    Binding="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=IsMouseOver}"
                    Value="True">
                <Setter Property="Visibility" Value="Visible" />
            </DataTrigger>
        </Style.Triggers>
    </Style>
</Button.Style>