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Wednesday, September 11, 2013

Styling A ScrollViewer/Scrollbar In WPF

The following post contains a basic example of how to customize the WPF ScrollViewer/Scrollbar.


Look up MSDN, for example

The following post contains a basic example of how to customise the WPF ScrollView scroll bars. The original XAML was built using Expression Blend, and has been further simplified for clarity. The resulting ScrollView looks like this:- Download



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<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

    <SolidColorBrush x:Key="DisabledForegroundBrush" Color="#BFBFBF" />
    <SolidColorBrush x:Key="NormalBrush" Color="#42BCED" />
    <SolidColorBrush x:Key="GlyphBrush" Color="Black" />

    <LinearGradientBrush x:Key="GradientBrush" StartPoint="0,0" EndPoint="0,1">
        <LinearGradientBrush.GradientStops>
            <GradientStopCollection>
                <GradientStop Color="#FFFFFF" Offset="0"/>
                <GradientStop Color="#71E4FD" Offset="0.50"/>
                <GradientStop Color="#FFFFFF" Offset="1"/>
            </GradientStopCollection>
        </LinearGradientBrush.GradientStops>
    </LinearGradientBrush>

    <LinearGradientBrush x:Key="PressedBrush"
StartPoint="0,0" EndPoint="0,1">
        <GradientBrush.GradientStops>
            <GradientStopCollection>
                <GradientStop Color="#FFFFFF" Offset="0"/>
                <GradientStop Color="#FAE78D" Offset="0.50"/>
                <GradientStop Color="#FFFFFF" Offset="1"/>
            </GradientStopCollection>
        </GradientBrush.GradientStops>
    </LinearGradientBrush>

    <LinearGradientBrush x:Key="GradientButtonBrush" StartPoint="0,1" EndPoint="0,0">
        <LinearGradientBrush.GradientStops>
            <GradientStopCollection>
                <GradientStop Color="#FFFFFF" Offset="0"/>
                <GradientStop Color="#71E4FD" Offset="1"/>
            </GradientStopCollection>
        </LinearGradientBrush.GradientStops>
    </LinearGradientBrush>

    <Style x:Key="ScrollBarLineButton" TargetType="{x:Type RepeatButton}">
        <Setter Property="SnapsToDevicePixels" Value="True"/>
        <Setter Property="OverridesDefaultStyle" Value="true"/>
        <Setter Property="Focusable" Value="false"/>
        <Setter Property="Cursor" Value="Hand"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type RepeatButton}">
                    <Border
Name="Border"
Margin="1"
CornerRadius="2"
Background="{StaticResource GradientButtonBrush}"
BorderBrush="{StaticResource NormalBrush}"
BorderThickness="1">
                        <Path
HorizontalAlignment="Center"
VerticalAlignment="Center"
Fill="{StaticResource GlyphBrush}"
Data="{Binding Path=Content,
RelativeSource={RelativeSource TemplatedParent}}" />
                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsPressed" Value="true">
                            <Setter TargetName="Border" Property="Background"
Value="{StaticResource PressedBrush}" />
                        </Trigger>

                        <Trigger Property="IsEnabled" Value="false">
                            <Setter Property="Foreground"
Value="{StaticResource DisabledForegroundBrush}"/>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

    <Style x:Key="ScrollBarPageButton" TargetType="{x:Type RepeatButton}">
        <Setter Property="SnapsToDevicePixels" Value="True"/>
        <Setter Property="OverridesDefaultStyle" Value="true"/>
        <Setter Property="IsTabStop" Value="false"/>
        <Setter Property="Focusable" Value="false"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type RepeatButton}">
                    <Border Background="Transparent" />
                </ControlTemplate>
            </Setter.Value>
        </Setter>

    </Style>
    <Style x:Key="ScrollBarThumb" TargetType="{x:Type Thumb}">
        <Setter Property="SnapsToDevicePixels" Value="True"/>
        <Setter Property="OverridesDefaultStyle" Value="true"/>
        <Setter Property="IsTabStop" Value="false"/>
        <Setter Property="Focusable" Value="false"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type Thumb}">
                    <Border
CornerRadius="2"
Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="1" />
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

    <ControlTemplate x:Key="VerticalScrollBar"
TargetType="{x:Type ScrollBar}">
        <Grid >
            <Grid.RowDefinitions>
                <RowDefinition MaxHeight="18"/>
                <RowDefinition Height="0.00001*"/>
                <RowDefinition MaxHeight="18"/>
            </Grid.RowDefinitions>
            <Border
Grid.RowSpan="3"
CornerRadius="2"
Background="#F0F0F0" />

            <RepeatButton
Grid.Row="0"
Style="{StaticResource ScrollBarLineButton}"
Height="18"
Command="ScrollBar.LineUpCommand"
Content="M 0 4 L 8 4 L 4 0 Z" />

            <Track
Name="PART_Track"
Grid.Row="1"
Cursor="Hand"
IsDirectionReversed="true">
                <Track.DecreaseRepeatButton>

                    <RepeatButton
Style="{StaticResource ScrollBarPageButton}"
Command="ScrollBar.PageUpCommand" />
                </Track.DecreaseRepeatButton>
                <Track.Thumb>
                    <Thumb
Style="{StaticResource ScrollBarThumb}"
Margin="1,0,1,0"
Background="{StaticResource GradientBrush}"
BorderBrush="{StaticResource NormalBrush}" />
                </Track.Thumb>
                <Track.IncreaseRepeatButton>

                    <RepeatButton
Style="{StaticResource ScrollBarPageButton}"
Command="ScrollBar.PageDownCommand" />
                </Track.IncreaseRepeatButton>
            </Track>

            <RepeatButton
Grid.Row="3"
Style="{StaticResource ScrollBarLineButton}"
Height="18"
Command="ScrollBar.LineDownCommand"
Content="M 0 0 L 4 4 L 8 0 Z"/>
        </Grid>
    </ControlTemplate>

    <ControlTemplate x:Key="HorizontalScrollBar"
TargetType="{x:Type ScrollBar}">
        <Grid >
            <Grid.ColumnDefinitions>
                <ColumnDefinition MaxWidth="18"/>
                <ColumnDefinition Width="0.00001*"/>
                <ColumnDefinition MaxWidth="18"/>
            </Grid.ColumnDefinitions>
            <Border

Grid.ColumnSpan="3"
CornerRadius="3"
Background="#F0F0F0" />

            <RepeatButton
Grid.Column="0"
Style="{StaticResource ScrollBarLineButton}"
Width="18"
Command="ScrollBar.LineLeftCommand"
Content="M 4 0 L 4 8 L 0 4 Z" />
            <Track
Name="PART_Track"
Grid.Column="1"
Cursor="Hand"
IsDirectionReversed="False">
                <Track.DecreaseRepeatButton>
                    <RepeatButton
Style="{StaticResource ScrollBarPageButton}"
Command="ScrollBar.PageLeftCommand" />
                </Track.DecreaseRepeatButton>
                <Track.Thumb>

                    <Thumb
Style="{StaticResource ScrollBarThumb}"
Margin="0,1,0,1"
Background="{StaticResource GradientBrush}"
BorderBrush="{StaticResource NormalBrush}" />
                </Track.Thumb>
                <Track.IncreaseRepeatButton>
                    <RepeatButton
Style="{StaticResource ScrollBarPageButton}"
Command="ScrollBar.PageRightCommand" />
                </Track.IncreaseRepeatButton>

            </Track>

            <RepeatButton
Grid.Column="3"
Style="{StaticResource ScrollBarLineButton}"
Width="18"
Command="ScrollBar.LineRightCommand"
Content="M 0 0 L 4 4 L 0 8 Z"/>
        </Grid>
    </ControlTemplate>

    <Style x:Key="{x:Type ScrollBar}" TargetType="{x:Type ScrollBar}">
        <Setter Property="SnapsToDevicePixels" Value="True"/>
        <Setter Property="OverridesDefaultStyle" Value="true"/>
        <Style.Triggers>
            <Trigger Property="Orientation" Value="Horizontal">
                <Setter Property="Width" Value="Auto"/>
                <Setter Property="Height" Value="18" />
                <Setter Property="Template"
Value="{StaticResource HorizontalScrollBar}" />

            </Trigger>
            <Trigger Property="Orientation" Value="Vertical">
                <Setter Property="Width" Value="18"/>
                <Setter Property="Height" Value="Auto" />
                <Setter Property="Template"
Value="{StaticResource VerticalScrollBar}" />
            </Trigger>
        </Style.Triggers>
    </Style>

    <Style x:Key="FavsScrollViewer" TargetType="{x:Type ScrollViewer}">
        <Setter Property="OverridesDefaultStyle" Value="True"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type ScrollViewer}">
                    <Grid>

                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="Auto"/>
                            <ColumnDefinition/>
                        </Grid.ColumnDefinitions>
                        <Grid.RowDefinitions>
                            <RowDefinition/>
                            <RowDefinition Height="Auto"/>
                        </Grid.RowDefinitions>

                        <ScrollContentPresenter Grid.Column="1"/>
                        <ScrollBar Name="PART_VerticalScrollBar"
Value="{TemplateBinding VerticalOffset}"
Maximum="{TemplateBinding ScrollableHeight}"
ViewportSize="{TemplateBinding ViewportHeight}"
Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}"/>
                        <ScrollBar Name="PART_HorizontalScrollBar"
Orientation="Horizontal"
Grid.Row="1"
Grid.Column="1"
Value="{TemplateBinding HorizontalOffset}"
Maximum="{TemplateBinding ScrollableWidth}"
ViewportSize="{TemplateBinding ViewportWidth}"
Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}"/>

                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

</ResourceDictionary>
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