WPF ComboBox样式 分类： .NET 2015-05-11 14:06 515人阅读 评论(0) 收藏

ComboBox样式：

<Window.Resources>
        <ControlTemplate x:Key="ComboBoxTextBox" TargetType="{x:Type TextBox}">
            <Border x:Name="PART_ContentHost" Focusable="False" Background="{TemplateBinding Background}" />
        </ControlTemplate>
        <ControlTemplate x:Key="ComboBoxToggleButton" TargetType="{x:Type ToggleButton}">
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition />
                    <ColumnDefinition Width="40" />
                </Grid.ColumnDefinitions>
                <Border Grid.Column="0" BorderThickness="2" BorderBrush="#e8e8e8" />

                <Border Grid.Column="1" Background="#e8e8e8" Cursor="Hand"/>
                <Path x:Name="Arrow" Grid.Column="1" HorizontalAlignment="Center" VerticalAlignment="Center" Data="M 0 0 L 4 4 L 8 0 Z" Margin="16,16,10,10" Stretch="Fill" Fill="White" />
            </Grid>
        </ControlTemplate>
      
        <Style TargetType="{x:Type ComboBox}">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type ComboBox}">
                        <Grid>
                            <!-- ToggleButton 已数据绑定到 ComboBox 本身以切换 IsDropDownOpen -->
                            <ToggleButton Grid.Column="2" Template="{DynamicResource ComboBoxToggleButton}" x:Name="ToggleButton" Focusable="false" IsChecked="{Binding Path=IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" ClickMode="Press"/>
                            <ContentPresenter HorizontalAlignment="Left" Margin="3,3,23,3" x:Name="ContentSite" VerticalAlignment="Center" Content="{TemplateBinding SelectionBoxItem}" ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}" ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}" IsHitTestVisible="False"/>

                            <!-- 必须将 TextBox 命名为 PART_EditableTextBox，否则 ComboBox 将无法识别它 -->
                            <TextBox Visibility="Hidden" Template="{DynamicResource ComboBoxTextBox}" HorizontalAlignment="Left" Margin="3,3,23,3" x:Name="PART_EditableTextBox" Style="{x:Null}" VerticalAlignment="Center" Focusable="True" Background="Transparent" IsReadOnly="{TemplateBinding IsReadOnly}"/>

                            <!-- Popup 可显示 ComboBox 中的项列表。IsOpen 已数据绑定到通过 ComboBoxToggleButton 来切换的 IsDropDownOpen -->
                            <Popup IsOpen="{TemplateBinding IsDropDownOpen}" Placement="Bottom" x:Name="Popup" Focusable="False" AllowsTransparency="True" PopupAnimation="Slide">
                                <Grid MaxHeight="{TemplateBinding MaxDropDownHeight}" MinWidth="{TemplateBinding ActualWidth}" x:Name="DropDown" SnapsToDevicePixels="True">
                                    <Border x:Name="DropDownBorder" Background="{DynamicResource WindowBackgroundBrush}" BorderBrush="{DynamicResource SolidBorderBrush}" BorderThickness="1"/>
                                    <ScrollViewer Margin="4,6,4,6" Style="{DynamicResource SimpleScrollViewer}" SnapsToDevicePixels="True" HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto" CanContentScroll="True">
                                        <!-- StackPanel 用于显示子级，方法是将 IsItemsHost 设置为 True -->
                                        <StackPanel IsItemsHost="True" KeyboardNavigation.DirectionalNavigation="Contained" Background="White"/>
                                    </ScrollViewer>
                                </Grid>
                            </Popup>
                        </Grid>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </Window.Resources>

将此样式放到ComboBox的XAML中即可。

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