HandyControl/HandyControl/Themes/Styles/TextBox.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:controls="clr-namespace:HandyControl.Controls"
                    xmlns:system="clr-namespace:System;assembly=mscorlib">

    <ResourceDictionary.MergedDictionaries>
        <ResourceDictionary Source="Base/TextBoxBaseStyle.xaml"/>
        <ResourceDictionary Source="TextBlock.xaml"/>
    </ResourceDictionary.MergedDictionaries>

    <Style BasedOn="{StaticResource WatermarkTextBoxBaseStyle}" TargetType="controls:WatermarkTextBox"/>

    <Style BasedOn="{StaticResource TextBoxBaseStyle}" TargetType="TextBox"/>

    <ControlTemplate x:Key="TextBoxExtendTopTemplate" TargetType="TextBox">
        <Grid>
            <Grid.RowDefinitions>
                <RowDefinition Height="Auto"/>
                <RowDefinition Height="{Binding Path=(controls:InfoElement.ContentHeight),RelativeSource={RelativeSource TemplatedParent}}"/>
            </Grid.RowDefinitions>
            <StackPanel Visibility="{Binding Path=(controls:InfoElement.Title),RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource String2VisibilityConverter}}" Orientation="Horizontal" Margin="7,4">
                <TextBlock Foreground="{DynamicResource PrimaryTextBrush}" Margin="1,0,0,0" Text="{Binding Path=(controls:InfoElement.Title),RelativeSource={RelativeSource TemplatedParent}}"/>
                <ContentPresenter TextElement.Foreground="{DynamicResource DangerBrush}" Margin="4,0,0,0" Content="{Binding Path=(controls:InfoElement.Symbol),RelativeSource={RelativeSource TemplatedParent}}" Visibility="{Binding Path=(controls:InfoElement.Necessary),RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource Boolean2VisibilityConverter}}"/>
            </StackPanel>
            <Border x:Name="border" Grid.Row="1" CornerRadius="{Binding Path=(controls:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent}}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="True"/>
            <TextBlock VerticalAlignment="{TemplateBinding VerticalContentAlignment}" Margin="8" Grid.Row="1" Visibility="{TemplateBinding Text,Converter={StaticResource String2VisibilityReConverter}}" HorizontalAlignment="Stretch" Style="{StaticResource TextBlockDefaultThiLight}" Text="{Binding Path=(controls:InfoElement.Placeholder),RelativeSource={RelativeSource TemplatedParent}}"/>
            <ScrollViewer Padding="7,0" Margin="1,1,1,2" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}" Grid.Row="1" x:Name="PART_ContentHost" Focusable="false" HorizontalScrollBarVisibility="Hidden" VerticalScrollBarVisibility="Hidden"/>
        </Grid>
        <ControlTemplate.Triggers>
            <Trigger Property="IsEnabled" Value="false">
                <Setter Property="Opacity" TargetName="border" Value="0.4"/>
            </Trigger>
            <Trigger Property="IsMouseOver" Value="true" SourceName="PART_ContentHost">
                <Setter Property="BorderBrush" TargetName="border" Value="{DynamicResource SecondaryBorderBrush}"/>
            </Trigger>
            <Trigger Property="IsFocused" Value="true">
                <Setter Property="BorderBrush" TargetName="border" Value="{DynamicResource PrimaryBrush}"/>
            </Trigger>
        </ControlTemplate.Triggers>
    </ControlTemplate>

    <ControlTemplate x:Key="TextBoxExtendLeftTemplate" TargetType="TextBox">
        <Grid Height="{Binding Path=(controls:InfoElement.ContentHeight),RelativeSource={RelativeSource TemplatedParent}}">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="{Binding Path=(controls:InfoElement.TitleWidth),RelativeSource={RelativeSource TemplatedParent}}"/>
                <ColumnDefinition/>
            </Grid.ColumnDefinitions>
            <StackPanel Visibility="{Binding Path=(controls:InfoElement.Title),RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource String2VisibilityConverter}}" Orientation="Horizontal" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" Margin="0,7,6,8">
                <TextBlock Foreground="{DynamicResource PrimaryTextBrush}" Text="{Binding Path=(controls:InfoElement.Title),RelativeSource={RelativeSource TemplatedParent}}"/>
                <ContentPresenter TextElement.Foreground="{DynamicResource DangerBrush}" Margin="4,0,0,0" Content="{Binding Path=(controls:InfoElement.Symbol),RelativeSource={RelativeSource TemplatedParent}}" Visibility="{Binding Path=(controls:InfoElement.Necessary),RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource Boolean2VisibilityConverter}}"/>
            </StackPanel>
            <Border x:Name="border" Grid.Column="1" CornerRadius="{Binding Path=(controls:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent}}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="True"/>
            <TextBlock VerticalAlignment="{TemplateBinding VerticalContentAlignment}" Margin="8,7,8,8" Grid.Column="1" Visibility="{TemplateBinding Text,Converter={StaticResource String2VisibilityReConverter}}" HorizontalAlignment="Stretch" Style="{StaticResource TextBlockDefaultThiLight}" Text="{Binding Path=(controls:InfoElement.Placeholder),RelativeSource={RelativeSource TemplatedParent}}"/>
            <ScrollViewer Grid.Column="1" Padding="7,0" Margin="1,1,1,2" x:Name="PART_ContentHost" Focusable="false" HorizontalScrollBarVisibility="Hidden" VerticalScrollBarVisibility="Hidden"/>
        </Grid>
        <ControlTemplate.Triggers>
            <Trigger Property="IsEnabled" Value="false">
                <Setter Property="Opacity" TargetName="border" Value="0.4"/>
            </Trigger>
            <Trigger Property="IsMouseOver" Value="true" SourceName="PART_ContentHost">
                <Setter Property="BorderBrush" TargetName="border" Value="{DynamicResource SecondaryBorderBrush}"/>
            </Trigger>
            <Trigger Property="IsFocused" Value="true">
                <Setter Property="BorderBrush" TargetName="border" Value="{DynamicResource PrimaryBrush}"/>
            </Trigger>
        </ControlTemplate.Triggers>
    </ControlTemplate>

    <Style x:Key="TextBoxExtend" BasedOn="{StaticResource TextBoxBaseStyle}" TargetType="TextBox">
        <Setter Property="controls:InfoElement.Symbol" Value="●"/>
        <Setter Property="controls:InfoElement.ContentHeight" Value="30.0"/>
        <Setter Property="Height" Value="{x:Static system:Double.NaN}"/>
        <Setter Property="Template" Value="{StaticResource TextBoxExtendTopTemplate}"/>
        <Style.Triggers>
            <Trigger Property="controls:InfoElement.TitleAlignment" Value="Left">
                <Setter Property="Template" Value="{StaticResource TextBoxExtendLeftTemplate}"/>
                <Setter Property="Width" Value="{x:Static system:Double.NaN}"/>
            </Trigger>
        </Style.Triggers>
    </Style>

    <ControlTemplate x:Key="TextBoxPlusTopTemplate" TargetType="controls:TextBox">
        <Grid>
            <Grid.RowDefinitions>
                <RowDefinition Height="Auto"/>
                <RowDefinition Height="{Binding Path=(controls:InfoElement.ContentHeight),RelativeSource={RelativeSource TemplatedParent}}"/>
            </Grid.RowDefinitions>
            <StackPanel Visibility="{Binding Path=(controls:InfoElement.Title),RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource String2VisibilityConverter}}" Orientation="Horizontal" Margin="7,4">
                <TextBlock Foreground="{DynamicResource PrimaryTextBrush}" Margin="1,0,0,0" Text="{Binding Path=(controls:InfoElement.Title),RelativeSource={RelativeSource TemplatedParent}}"/>
                <ContentPresenter TextElement.Foreground="{DynamicResource DangerBrush}" Margin="4,0,0,0" Content="{Binding Path=(controls:InfoElement.Symbol),RelativeSource={RelativeSource TemplatedParent}}" Visibility="{Binding Path=(controls:InfoElement.Necessary),RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource Boolean2VisibilityConverter}}"/>
            </StackPanel>
            <Border x:Name="border" Grid.Row="1" CornerRadius="{Binding Path=(controls:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent}}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="True"/>
            <TextBlock VerticalAlignment="{TemplateBinding VerticalContentAlignment}" Margin="8" Grid.Row="1" Visibility="{TemplateBinding Text,Converter={StaticResource String2VisibilityReConverter}}" HorizontalAlignment="Stretch" Style="{StaticResource TextBlockDefaultThiLight}" Text="{Binding Path=(controls:InfoElement.Placeholder),RelativeSource={RelativeSource TemplatedParent}}"/>
            <ScrollViewer Padding="7,0" Margin="1,1,1,2" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}" Grid.Row="1" x:Name="PART_ContentHost" Focusable="false" HorizontalScrollBarVisibility="Hidden" VerticalScrollBarVisibility="Hidden"/>
        </Grid>
        <ControlTemplate.Triggers>
            <Trigger Property="IsEnabled" Value="false">
                <Setter Property="Opacity" TargetName="border" Value="0.4"/>
            </Trigger>
            <Trigger Property="IsMouseOver" Value="true" SourceName="PART_ContentHost">
                <Setter Property="BorderBrush" TargetName="border" Value="{DynamicResource SecondaryBorderBrush}"/>
            </Trigger>
            <Trigger Property="IsFocused" Value="true">
                <Setter Property="BorderBrush" TargetName="border" Value="{DynamicResource PrimaryBrush}"/>
            </Trigger>
        </ControlTemplate.Triggers>
    </ControlTemplate>

    <ControlTemplate x:Key="TextBoxPlusLeftTemplate" TargetType="controls:TextBox">
        <Grid Height="{Binding Path=(controls:InfoElement.ContentHeight),RelativeSource={RelativeSource TemplatedParent}}">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="{Binding Path=(controls:InfoElement.TitleWidth),RelativeSource={RelativeSource TemplatedParent}}"/>
                <ColumnDefinition/>
            </Grid.ColumnDefinitions>
            <StackPanel Visibility="{Binding Path=(controls:InfoElement.Title),RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource String2VisibilityConverter}}" Orientation="Horizontal" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" Margin="0,7,6,8">
                <TextBlock Foreground="{DynamicResource PrimaryTextBrush}" Text="{Binding Path=(controls:InfoElement.Title),RelativeSource={RelativeSource TemplatedParent}}"/>
                <ContentPresenter TextElement.Foreground="{DynamicResource DangerBrush}" Margin="4,0,0,0" Content="{Binding Path=(controls:InfoElement.Symbol),RelativeSource={RelativeSource TemplatedParent}}" Visibility="{Binding Path=(controls:InfoElement.Necessary),RelativeSource={RelativeSource TemplatedParent},Converter={StaticResource Boolean2VisibilityConverter}}"/>
            </StackPanel>
            <Border x:Name="border" Grid.Column="1" CornerRadius="{Binding Path=(controls:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent}}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="True"/>
            <TextBlock VerticalAlignment="{TemplateBinding VerticalContentAlignment}" Margin="8,7,8,8" Grid.Column="1" Visibility="{TemplateBinding Text,Converter={StaticResource String2VisibilityReConverter}}" HorizontalAlignment="Stretch" Style="{StaticResource TextBlockDefaultThiLight}" Text="{Binding Path=(controls:InfoElement.Placeholder),RelativeSource={RelativeSource TemplatedParent}}"/>
            <ScrollViewer Grid.Column="1" Padding="7,0" Margin="1,1,1,2" x:Name="PART_ContentHost" Focusable="false" HorizontalScrollBarVisibility="Hidden" VerticalScrollBarVisibility="Hidden"/>
        </Grid>
        <ControlTemplate.Triggers>
            <Trigger Property="IsEnabled" Value="false">
                <Setter Property="Opacity" TargetName="border" Value="0.4"/>
            </Trigger>
            <Trigger Property="IsMouseOver" Value="true" SourceName="PART_ContentHost">
                <Setter Property="BorderBrush" TargetName="border" Value="{DynamicResource SecondaryBorderBrush}"/>
            </Trigger>
            <Trigger Property="IsFocused" Value="true">
                <Setter Property="BorderBrush" TargetName="border" Value="{DynamicResource PrimaryBrush}"/>
            </Trigger>
        </ControlTemplate.Triggers>
    </ControlTemplate>

    <Style BasedOn="{StaticResource TextBoxExtend}" TargetType="controls:TextBox">
        <Setter Property="Template" Value="{StaticResource TextBoxPlusTopTemplate}"/>
        <Style.Triggers>
            <Trigger Property="controls:InfoElement.TitleAlignment" Value="Left">
                <Setter Property="Template" Value="{StaticResource TextBoxPlusLeftTemplate}"/>
                <Setter Property="Width" Value="{x:Static system:Double.NaN}"/>
            </Trigger>
        </Style.Triggers>
    </Style>

</ResourceDictionary>