Stili e modelli di ScrollBar

  • Articolo

In questo argomento vengono descritti gli stili e i modelli per il controllo ScrollBar. È possibile modificare l'oggetto ControlTemplate predefinito per conferire al controllo un aspetto univoco. Per ulteriori informazioni, vedere Personalizzazione dell'aspetto di un controllo esistente mediante la creazione di un oggetto ControlTemplate.

Parti del controllo ScrollBar

Nella tabella seguente sono elencate le parti denominate del controllo ScrollBar.

Parte

Tipo

Descrizione

PART_Track

Track

Contenitore dell'elemento che indica la posizione dell'oggetto ScrollBar.

Stati del controllo ScrollBar

Nella tabella seguente sono elencati gli stati visivi per il controllo ScrollBar.

Nome VisualState

Nome VisualStateGroup

Descrizione

Normal

CommonStates

Stato predefinito.

MouseOver

CommonStates

Il puntatore del mouse è posizionato sul controllo.

Disabled

CommonStates

Il controllo è disabilitato.

Valid

ValidationStates

Il controllo utilizza la classe Validation e la proprietà associata Validation.HasError è false.

InvalidFocused

ValidationStates

La proprietà associata Validation.HasError è true e il controllo ha lo stato attivo.

InvalidUnfocused

ValidationStates

La proprietà associata Validation.HasError è true e il controllo non ha lo stato attivo.

Esempio di ControlTemplate del controllo ScrollBar

Nell'esempio seguente viene illustrato come definire un oggetto ControlTemplate per il controllo ScrollBar.

<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="Template">
    <Setter.Value>
      <ControlTemplate TargetType="{x:Type RepeatButton}">
        <Border x:Name="Border"
                Margin="1"
                CornerRadius="2"
                BorderThickness="1">
          <Border.BorderBrush>
            <LinearGradientBrush StartPoint="0,0"
                                 EndPoint="0,1">
              <LinearGradientBrush.GradientStops>
                <GradientStopCollection>
                  <GradientStop Color="{DynamicResource BorderMediumColor}"
                                Offset="0.0" />
                  <GradientStop Color="{DynamicResource BorderDarkColor}"
                                Offset="1.0" />
                </GradientStopCollection>
              </LinearGradientBrush.GradientStops>
            </LinearGradientBrush>
          </Border.BorderBrush>
          <Border.Background>
            <LinearGradientBrush StartPoint="0,0"
                                 EndPoint="0,1">
              <LinearGradientBrush.GradientStops>
                <GradientStopCollection>
                  <GradientStop Color="{DynamicResource ControlLightColor}"/>
                  <GradientStop Color="{DynamicResource ControlMediumColor}"
                                Offset="1.0" />
                </GradientStopCollection>
              </LinearGradientBrush.GradientStops>
            </LinearGradientBrush>
          </Border.Background>
          <VisualStateManager.VisualStateGroups>
            <VisualStateGroup x:Name="CommonStates">
              <VisualState x:Name="Normal" />
              <VisualState x:Name="MouseOver" />
              <VisualState x:Name="Pressed">
                <Storyboard>
                  <ColorAnimationUsingKeyFrames Storyboard.TargetName="Border"
                                                Storyboard.TargetProperty="(Panel.Background).
                    (GradientBrush.GradientStops)[1].(GradientStop.Color)">
                    <EasingColorKeyFrame KeyTime="0"
                                         Value="{StaticResource ControlPressedColor}" />
                  </ColorAnimationUsingKeyFrames>
                </Storyboard>
              </VisualState>
              <VisualState x:Name="Disabled">
                <Storyboard>
                  <ColorAnimationUsingKeyFrames Storyboard.TargetName="Arrow"
                                                Storyboard.TargetProperty="(Shape.Fill).
                    (SolidColorBrush.Color)">
                    <EasingColorKeyFrame KeyTime="0"
                                         Value="{StaticResource DisabledForegroundColor}" />
                  </ColorAnimationUsingKeyFrames>
                </Storyboard>
              </VisualState>
            </VisualStateGroup>
          </VisualStateManager.VisualStateGroups>
          <Path x:Name="Arrow"
                HorizontalAlignment="Center"
                VerticalAlignment="Center"
                Data="{Binding Content, 
            RelativeSource={RelativeSource TemplatedParent}}" >
            <Path.Fill>
                <SolidColorBrush Color="{DynamicResource GlyphColor}"/>
            </Path.Fill>
          </Path>
        </Border>
      </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 x:Name="PART_Track"
           Grid.Row="1"
           IsDirectionReversed="true">
      <Track.DecreaseRepeatButton>
        <RepeatButton Style="{StaticResource ScrollBarPageButton}"
                      Command="ScrollBar.PageUpCommand" />
      </Track.DecreaseRepeatButton>
      <Track.Thumb>
        <Thumb Style="{StaticResource ScrollBarThumb}"
               Margin="1,0,1,0">
          <Thumb.BorderBrush>

            <LinearGradientBrush StartPoint="0,0"
                                 EndPoint="1,0">
              <LinearGradientBrush.GradientStops>
                <GradientStopCollection>
                  <GradientStop Color="{DynamicResource BorderLightColor}"
                                Offset="0.0" />
                  <GradientStop Color="{DynamicResource BorderDarkColor}"
                                Offset="1.0" />
                </GradientStopCollection>
              </LinearGradientBrush.GradientStops>
            </LinearGradientBrush>

          </Thumb.BorderBrush>
          <Thumb.Background>

            <LinearGradientBrush StartPoint="0,0"
                                 EndPoint="1,0">
              <LinearGradientBrush.GradientStops>
                <GradientStopCollection>
                  <GradientStop Color="{DynamicResource ControlLightColor}"
                                Offset="0.0" />
                  <GradientStop Color="{DynamicResource ControlMediumColor}"
                                Offset="1.0" />
                </GradientStopCollection>
              </LinearGradientBrush.GradientStops>
            </LinearGradientBrush>

          </Thumb.Background>
        </Thumb>
      </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="2"
            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 x:Name="PART_Track"
           Grid.Column="1"
           IsDirectionReversed="False">
      <Track.DecreaseRepeatButton>
        <RepeatButton Style="{StaticResource ScrollBarPageButton}"
                      Command="ScrollBar.PageLeftCommand" />
      </Track.DecreaseRepeatButton>
      <Track.Thumb>
        <Thumb Style="{StaticResource ScrollBarThumb}"
               Margin="0,1,0,1">

          <Thumb.BorderBrush>

            <LinearGradientBrush StartPoint="0,0"
                                 EndPoint="1,0">
              <LinearGradientBrush.GradientStops>
                <GradientStopCollection>
                  <GradientStop Color="{DynamicResource BorderLightColor}"
                                Offset="0.0" />
                  <GradientStop Color="{DynamicResource BorderDarkColor}"
                                Offset="1.0" />
                </GradientStopCollection>
              </LinearGradientBrush.GradientStops>
            </LinearGradientBrush>

          </Thumb.BorderBrush>
          <Thumb.Background>

            <LinearGradientBrush StartPoint="0,0"
                                 EndPoint="0,1">
              <LinearGradientBrush.GradientStops>
                <GradientStopCollection>
                  <GradientStop Color="{DynamicResource ControlLightColor}"
                                Offset="0.0" />
                  <GradientStop Color="{DynamicResource ControlMediumColor}"
                                Offset="1.0" />
                </GradientStopCollection>
              </LinearGradientBrush.GradientStops>
            </LinearGradientBrush>

          </Thumb.Background>
        </Thumb>
      </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>

Nell'esempio precedente vengono utilizzate una o più delle risorse seguenti.

<!--Control colors.-->
<Color x:Key="WindowColor">#FFE8EDF9</Color>
<Color x:Key="ContentAreaColorLight">#FFC5CBF9</Color>
<Color x:Key="ContentAreaColorDark">#FF7381F9</Color>

<Color x:Key="DisabledControlLightColor">#FFE8EDF9</Color>
<Color x:Key="DisabledControlDarkColor">#FFC5CBF9</Color>
<Color x:Key="DisabledForegroundColor">#FF888888</Color>

<Color x:Key="SelectedBackgroundColor">#FFC5CBF9</Color>
<Color x:Key="SelectedUnfocusedColor">#FFDDDDDD</Color>

<Color x:Key="ControlLightColor">White</Color>
<Color x:Key="ControlMediumColor">#FF7381F9</Color>
<Color x:Key="ControlDarkColor">#FF211AA9</Color>

<Color x:Key="ControlMouseOverColor">#FF3843C4</Color>
<Color x:Key="ControlPressedColor">#FF211AA9</Color>


<Color x:Key="GlyphColor">#FF444444</Color>
<Color x:Key="GlyphMouseOver">sc#1, 0.004391443, 0.002428215, 0.242281124</Color>

<!--Border colors-->
<Color x:Key="BorderLightColor">#FFCCCCCC</Color>
<Color x:Key="BorderMediumColor">#FF888888</Color>
<Color x:Key="BorderDarkColor">#FF444444</Color>

<Color x:Key="PressedBorderLightColor">#FF888888</Color>
<Color x:Key="PressedBorderDarkColor">#FF444444</Color>

<Color x:Key="DisabledBorderLightColor">#FFAAAAAA</Color>
<Color x:Key="DisabledBorderDarkColor">#FF888888</Color>

<Color x:Key="DefaultBorderBrushDarkColor">Black</Color>

<!--Control-specific resources.-->
<Color x:Key="HeaderTopColor">#FFC5CBF9</Color>
<Color x:Key="DatagridCurrentCellBorderColor">Black</Color>
<Color x:Key="SliderTrackDarkColor">#FFC5CBF9</Color>

<Color x:Key="NavButtonFrameColor">#FF3843C4</Color>

<LinearGradientBrush x:Key="MenuPopupBrush"
                     EndPoint="0.5,1"
                     StartPoint="0.5,0">
  <GradientStop Color="{DynamicResource ControlLightColor}"
                Offset="0" />
  <GradientStop Color="{DynamicResource ControlMediumColor}"
                Offset="0.5" />
  <GradientStop Color="{DynamicResource ControlLightColor}"
                Offset="1" />
</LinearGradientBrush>

<LinearGradientBrush x:Key="ProgressBarIndicatorAnimatedFill"
                     StartPoint="0,0"
                     EndPoint="1,0">
  <LinearGradientBrush.GradientStops>
    <GradientStopCollection>
      <GradientStop Color="#000000FF"
                    Offset="0" />
      <GradientStop Color="#600000FF"
                    Offset="0.4" />
      <GradientStop Color="#600000FF"
                    Offset="0.6" />
      <GradientStop Color="#000000FF"
                    Offset="1" />
    </GradientStopCollection>
  </LinearGradientBrush.GradientStops>
</LinearGradientBrush>

Per l'esempio completo, vedere Esempio di applicazione di stili con ControlTemplates.

Vedere anche

Riferimenti

Style

ControlTemplate

Concetti

Applicazione di stili e modelli

Personalizzazione dell'aspetto di un controllo esistente mediante la creazione di un oggetto ControlTemplate

Altre risorse

Stili e modelli di Control

Personalizzazione dei controlli

Cronologia delle modifiche

Data

Cronologia

Motivo

Agosto 2010

Aggiunta dell'esempio ControlTemplate.

Miglioramento delle informazioni.