对WPF中Expander控件美化

示例图：

Expander控件功能很常见, 一般用于系统左侧的菜单收缩面板。

主要的组成

一个头部(header) 和 一个 内容(content) 组成。

 <Expander ExpandDirection="Down"  SnapsToDevicePixels="True" VerticalAlignment="Top" Style="{DynamicResource ExpanderStyle1}" >
                <Expander.Header>
                    <StackPanel Orientation="Horizontal">
                        <TextBlock  FontFamily="/WpfApplication1;component/Resources/#iconfont" Text="&#xe60c;" 
                                    FontSize="22" Foreground="#918C8C" VerticalAlignment="Center"></TextBlock>
                        <TextBlock FontSize="25" Text="首页" Margin="8,0,-51,0"  Foreground="#918C8C" ></TextBlock>
                    </StackPanel>
                </Expander.Header>
                <Expander.Content>
                    <StackPanel Background="#F6F8F8">
                        <RadioButton Style="{DynamicResource RadioButtonStyle}">控制中心</RadioButton>
                        <RadioButton Style="{DynamicResource RadioButtonStyle}">资源管理</RadioButton>
                        <RadioButton Style="{DynamicResource RadioButtonStyle}">仪表菜单</RadioButton>
                        <RadioButton Style="{DynamicResource RadioButtonStyle}">顶部导航</RadioButton>
                        <RadioButton Style="{DynamicResource RadioButtonStyle}">通知中心</RadioButton>
                        <RadioButton Style="{DynamicResource RadioButtonStyle}">蓝牙设置</RadioButton>
                    </StackPanel>
                </Expander.Content>
            </Expander>

为了修改掉原生的样式, 重新定义了一个Style /ExpanderStyle1

1.将原有的左侧圆形删除

2.把左侧的箭头移动至右侧 【主要修改红色加粗部分调整】

<Style x:Key="ExpanderStyle1" TargetType="{x:Type Expander}">
           <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
           <Setter Property="Background" Value="Transparent"/>
           <Setter Property="BorderBrush" Value="#918C8C"/>
           <Setter Property="BorderThickness" Value="0 0 0 0"/>
           <Setter Property="Template">
               <Setter.Value>
                   <ControlTemplate TargetType="{x:Type Expander}">
                       <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" CornerRadius="0" SnapsToDevicePixels="True">
                           <DockPanel>
                               <ToggleButton x:Name="HeaderSite" ContentTemplate="{TemplateBinding HeaderTemplate}"
                                             Content="{TemplateBinding Header}" DockPanel.Dock="Top" Foreground="{TemplateBinding Foreground}"
                                             FontWeight="{TemplateBinding FontWeight}" FontStyle="{TemplateBinding FontStyle}"
                                             FontStretch="{TemplateBinding FontStretch}" FontSize="{TemplateBinding FontSize}"
                                             FontFamily="{TemplateBinding FontFamily}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"
                                             IsChecked="{Binding IsExpanded, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"
                                             Margin="1" MinWidth="0" MinHeight="0" Padding="{TemplateBinding Padding}" VerticalContentAlignment="{TemplateBinding
                                   VerticalContentAlignment}">
                                   <ToggleButton.FocusVisualStyle>
                                       <Style>
                                           <Setter Property="Control.Template">
                                               <Setter.Value>
                                                   <ControlTemplate>
                                                       <Border>
                                                           <Rectangle Margin="0" SnapsToDevicePixels="True" Stroke="Black" StrokeThickness="1" StrokeDashArray="1 2"/>
                                                       </Border>
                                                   </ControlTemplate>
                                               </Setter.Value>
                                           </Setter>
                                       </Style>
                                   </ToggleButton.FocusVisualStyle>
                                   <ToggleButton.Style>
                                       <Style TargetType="{x:Type ToggleButton}">
                                           <Setter Property="Template">
                                               <Setter.Value>
                                                   <ControlTemplate TargetType="{x:Type ToggleButton}">
                                                       <Border Padding="{TemplateBinding Padding}">
                                                           <Grid>
                                                               <Grid.ColumnDefinitions>
                                                                   <ColumnDefinition Width="19*"/>
                                                               </Grid.ColumnDefinitions>
                                                               <Path Grid.Column="0" x:Name="arrow" Data="M1,1.5L4.5,5 8,1.5" HorizontalAlignment="Right"  SnapsToDevicePixels="False" Stroke="#918C8C" StrokeThickness="2" VerticalAlignment="Center" Height="10" Margin="0,10" />
                                                               <ContentPresenter ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" ContentStringFormat="{TemplateBinding ContentStringFormat}" HorizontalAlignment="Left" Margin="4,0,0,0" RecognizesAccessKey="True" SnapsToDevicePixels="True" VerticalAlignment="Center"  />
                                                           </Grid>
                                                       </Border>
                                                       <ControlTemplate.Triggers>
                                                           <Trigger Property="IsChecked" Value="True">
                                                               <Setter Property="Data" TargetName="arrow" Value="M1,4.5L4.5,1 8,4.5"/>
                                                           </Trigger>
                                                           <Trigger Property="IsMouseOver" Value="True">
                                                               <Setter Property="Stroke" TargetName="arrow" Value="Black"/>
                                                           </Trigger>
                                                           <Trigger Property="IsPressed" Value="True">
                                                               <Setter Property="Stroke" TargetName="arrow" Value="Black"/>
                                                           </Trigger>
                                                           <Trigger Property="IsEnabled" Value="False">
                                                               <Setter Property="Stroke" TargetName="arrow" Value="#FF707070"/>
                                                           </Trigger>
                                                       </ControlTemplate.Triggers>
                                                   </ControlTemplate>
                                               </Setter.Value>
                                           </Setter>
                                       </Style>
                                   </ToggleButton.Style>
                               </ToggleButton>
                               <ContentPresenter x:Name="ExpandSite" ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" ContentStringFormat="{TemplateBinding ContentStringFormat}" DockPanel.Dock="Bottom" Focusable="False" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" Visibility="Collapsed" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                           </DockPanel>
                       </Border>
                       <ControlTemplate.Triggers>
                           <Trigger Property="IsExpanded" Value="True">
                               <Setter Property="Visibility" TargetName="ExpandSite" Value="Visible"/>
                           </Trigger>
                           <Trigger Property="IsEnabled" Value="False">
                               <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
                           </Trigger>
                       </ControlTemplate.Triggers>
                   </ControlTemplate>
               </Setter.Value>
           </Setter>
       </Style>

3.在头部同时添加了一个字体图标, 用FontFamily绑定字体, 通过设置Text实现图标

<TextBlock  FontFamily="/WpfApplication1;component/Resources/#iconfont" Text=""
                                   FontSize="22" Foreground="#918C8C" VerticalAlignment="Center"></TextBlock>

4.在Content区域, 利用一个stackPanel面板 和多个 单选按钮组成子元素【同时修改原生的RadioButton样式】

<Expander.Content>
                    <StackPanel Background="#F6F8F8">
                        <RadioButton Style="{DynamicResource RadioButtonStyle}">控制中心</RadioButton>
                        <RadioButton Style="{DynamicResource RadioButtonStyle}">资源管理</RadioButton>
                        <RadioButton Style="{DynamicResource RadioButtonStyle}">仪表菜单</RadioButton>
                        <RadioButton Style="{DynamicResource RadioButtonStyle}">顶部导航</RadioButton>
                        <RadioButton Style="{DynamicResource RadioButtonStyle}">通知中心</RadioButton>
                        <RadioButton Style="{DynamicResource RadioButtonStyle}">蓝牙设置</RadioButton>
                    </StackPanel>
                </Expander.Content>

5.修改stackpanel面板背景色, 打到header与子元素背景产生一定的色差 【图上蓝色区域】

6.给RadioButton添加一个Style / RadioButtonStyle 【具体样式见代码注释】

<Style x:Key="RadioButtonStyle" TargetType="{x:Type RadioButton}">
           <Setter Property="FocusVisualStyle">
               <Setter.Value>
                   <Style>
                       <Setter Property="Control.Template">
                           <Setter.Value>
                               <ControlTemplate>
                                   <Rectangle Margin="2" SnapsToDevicePixels="True" Stroke="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}" StrokeThickness="1" StrokeDashArray="1 2"/>
                               </ControlTemplate>
                           </Setter.Value>
                       </Setter>
                   </Style>
               </Setter.Value>
           </Setter>             <!--Margin主要用于设置子元素距离左侧边距-->
           <Setter Property="Margin" Value="25 8 0 0"/> 
           <Setter Property="FontSize" Value="20"/>
           <Setter Property="VerticalContentAlignment" Value="Center"/>
           <Setter Property="HorizontalContentAlignment" Value="Left"/>
           <Setter Property="BorderBrush" Value="Transparent"/>
           <Setter Property="Foreground" Value="#918C8C"/>
           <Setter Property="BorderThickness" Value="0"/>
           <Setter Property="Template">
               <Setter.Value>
                   <ControlTemplate TargetType="{x:Type RadioButton}">
                       <Grid x:Name="templateRoot" Background="Transparent" SnapsToDevicePixels="True">
 
                           <Border x:Name="border" BorderBrush="Red"
                                    BorderThickness="0"  Opacity="0.1"
                               Background="Transparent" SnapsToDevicePixels="True"/>  　　　　　　　　　　　　　　　　<!-- 用于设置选中的左侧树形边框-->
                           <Border x:Name="bd2" BorderBrush="#2196F3" /> 
                           <ContentPresenter x:Name="contentPresenter" ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" Grid.Column="1" ContentStringFormat="{TemplateBinding ContentStringFormat}" Focusable="False" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                       </Grid>
                       <ControlTemplate.Triggers>
                           <Trigger Property="HasContent" Value="True">
                               <Setter Property="FocusVisualStyle">
                                   <Setter.Value>
                                       <Style>
                                           <Setter Property="Control.Template">
                                               <Setter.Value>
                                                   <ControlTemplate>
                                                       <Rectangle Margin="14,0,0,0" SnapsToDevicePixels="True" Stroke="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}" StrokeThickness="1" StrokeDashArray="1 2"/>
                                                   </ControlTemplate>
                                               </Setter.Value>
                                           </Setter>
                                       </Style>
                                   </Setter.Value>
                               </Setter>
                               <Setter Property="Padding" Value="4,-1,0,0"/>
                           </Trigger>
                           <Trigger Property="IsMouseOver" Value="True">　　　　　　　　　　　　　　　　　　　<!--当选中的时候, 改变字体的颜色, 同时左侧加一条宽度为2 的 边框 -->
                               <Setter Property="Foreground"  Value="#2196F3"/> 
                               <Setter Property="BorderThickness" Value="2 0 0 0" TargetName="bd2"/>
                           </Trigger>
                           <Trigger Property="IsChecked" Value="true">
                           </Trigger>
                           <Trigger Property="IsChecked" Value="{x:Null}"/>
                       </ControlTemplate.Triggers>
                   </ControlTemplate>
               </Setter.Value>
           </Setter>
           <Setter Property="MinHeight" Value="20"/>
           <Setter Property="HorizontalAlignment" Value="Stretch"/>
       </Style>

到此这篇关于对WPF中Expander控件美化的文章就介绍到这了。希望对大家的学习有所帮助，也希望大家多多支持自由互联。