如何更改GroupStyle顏色？

Question

我有不同的GroupStyle具有這樣的結構：

<ListView.GroupStyle> 
         <GroupStyle> 
          <GroupStyle.ContainerStyle> 
           <Style TargetType="{x:Type GroupItem}"> 
            <Setter Property="Template"> 
             <Setter.Value> 
              <ControlTemplate> 
               <Expander IsExpanded="True"> 
                <Expander.Header> 
                 <StackPanel Orientation="Horizontal"> 
                  <TextBlock Text="{Binding Name}" FontWeight="Bold" Foreground="Gray" FontSize="22" VerticalAlignment="Bottom" /> 
                  <TextBlock Text="{Binding ItemCount}" FontSize="22" Foreground="Green" FontWeight="Bold" FontStyle="Italic" Margin="10,0,0,0" VerticalAlignment="Bottom" /> 
                  <TextBlock Text=" Campionati" FontSize="22" Foreground="Silver" FontStyle="Italic" VerticalAlignment="Bottom" /> 
                 </StackPanel> 
                </Expander.Header> 
                <ItemsPresenter /> 
               </Expander> 
              </ControlTemplate> 
             </Setter.Value> 
            </Setter> 
           </Style> 
          </GroupStyle.ContainerStyle> 
         </GroupStyle> 

現在我想知道如何可以改變GroupStyle的背景顏色，尤其是現在這個有mahapp框架的默認顏色：

也可以設置高度尺寸？任何幫助，將不勝感激。

Answer 1

您可以更改擴展的背景：

<Expander IsExpanded="True" Background="Red"> 或者，如果你想保持Mahapps的主題，你應該使用Mahapps預定義的畫筆之一，並更改擴展樣式，因爲擴展相關與積極的口音。

編輯

這種風格添加到資源：

<Style x:Key="CustomExpanderHeaderStyle" BasedOn="{DynamicResource ExpanderUpHeaderStyle}" 
     TargetType="{x:Type ToggleButton}"> 
      <Setter Property="Height" Value="45"/> 
      <Setter Property="Background" Value="Red"/> 
      <Setter Property="Margin" Value="0"/> 
      <Setter Property="Template"> 
       <Setter.Value> 
        <ControlTemplate TargetType="{x:Type ToggleButton}"> 
         <Border Padding="{TemplateBinding Padding}" 
         Background="{TemplateBinding Background}" 
         BorderBrush="{TemplateBinding BorderBrush}" 
         BorderThickness="{TemplateBinding BorderThickness}"> 
          <Grid Background="Transparent" SnapsToDevicePixels="False"> 
           <Grid.ColumnDefinitions> 
            <ColumnDefinition Width="19" /> 
            <ColumnDefinition Width="*" /> 
           </Grid.ColumnDefinitions> 
           <Ellipse x:Name="Circle" 
           Width="19" 
           Height="19" 
           HorizontalAlignment="Center" 
           VerticalAlignment="Center" 
           Stroke="{TemplateBinding Foreground}" /> 
           <Path x:Name="Arrow" 
           HorizontalAlignment="Center" 
           VerticalAlignment="Center" 
           Stroke="{TemplateBinding Foreground}" 
           StrokeThickness="2" 
           Data="M 1,1.5 L 4.5,5 L 8,1.5" 
           SnapsToDevicePixels="false" /> 
           <controls:ContentControlEx Grid.Column="1" 
                Margin="4 0 0 0" 
                Padding="{TemplateBinding Padding}" 
                HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" 
                VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}" 
                Content="{TemplateBinding Content}" 
                ContentCharacterCasing="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=(controls:ControlsHelper.ContentCharacterCasing)}" 
                ContentStringFormat="{TemplateBinding ContentStringFormat}" 
                ContentTemplate="{TemplateBinding ContentTemplate}" 
                ContentTemplateSelector="{TemplateBinding ContentTemplateSelector}" 
                RecognizesAccessKey="True" 
                SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" /> 
          </Grid> 
         </Border> 
         <ControlTemplate.Triggers> 
          <Trigger Property="IsChecked" Value="true"> 
           <Setter TargetName="Arrow" Property="Data" Value="M 1,4.5 L 4.5,1 L 8,4.5" /> 
          </Trigger> 
          <Trigger Property="IsMouseOver" Value="true"> 
           <Setter TargetName="Arrow" Property="Stroke" Value="{DynamicResource GrayBrush2}" /> 
           <Setter TargetName="Circle" Property="Stroke" Value="{DynamicResource GrayBrush2}" /> 
          </Trigger> 
          <Trigger Property="IsPressed" Value="true"> 
           <Setter TargetName="Arrow" Property="Stroke" Value="{DynamicResource BlackColorBrush}" /> 
           <Setter TargetName="Circle" Property="Stroke" Value="{DynamicResource BlackColorBrush}" /> 
           <Setter TargetName="Circle" Property="StrokeThickness" Value="2" /> 
          </Trigger> 
         </ControlTemplate.Triggers> 
        </ControlTemplate> 
       </Setter.Value> 
      </Setter> 
     </Style> 

在GroupStyle：

<GroupStyle> 
         <GroupStyle.ContainerStyle> 
          <Style TargetType="{x:Type GroupItem}"> 
           <Setter Property="Template"> 
            <Setter.Value> 
             <ControlTemplate> 
              <Expander controls:ExpanderHelper.HeaderDownStyle="{StaticResource CustomExpanderHeaderStyle}" IsExpanded="True"> 
               <Expander.Header> 
                <StackPanel Orientation="Horizontal"> 
                 <TextBlock Text="{Binding Name}" FontWeight="Bold" Foreground="Gray" FontSize="22" VerticalAlignment="Bottom" /> 
                 <TextBlock Text="{Binding ItemCount}" FontSize="22" Foreground="Green" FontWeight="Bold" FontStyle="Italic" Margin="10,0,0,0" VerticalAlignment="Bottom" /> 
                 <TextBlock Text=" Campionati" FontSize="22" Foreground="Silver" FontStyle="Italic" VerticalAlignment="Bottom" /> 
                </StackPanel> 
               </Expander.Header> 
               <ItemsPresenter /> 
              </Expander> 
             </ControlTemplate> 
            </Setter.Value> 
           </Setter> 
          </Style> 
         </GroupStyle.ContainerStyle> 
        </GroupStyle> 

不要忘記補充的xmlns：

xmlns:controls="clr-namespace:MahApps.Metro.Controls;assembly=MahApps.Metro"