CheckComboBox：如何防止组合框在单击选择后关闭？

Question

我有一个组合框，里面有一堆复选框。我希望用户能够在组合框关闭（或由用户自己关闭）之前多次单击。现在的问题是，每次单击复选框时，组合框都会关闭，迫使想要 select 多个选项的用户多次重新打开它。

我发现了关于同一主题的其他问题，但这些问题适用于 Silverlight、Qt 等。比较标签。

我试过设置 StayOpenOnEdit，但没有成功。据我所知，没有属性解决我的问题。这让我怀疑我可能把错误的组件都放在一起了。

如何防止组合框在单击其中的复选框后自动关闭？
是否有更适合此类任务的组件，如果有，它的名称是什么？

请注意，即使 #2 的答案是 "yes"，出于纯粹的学术原因，我仍然对 #1 感到好奇。

我玩过切换按钮和列表框，正如 post 中有人建议的那样。但是，这只会导致始终完全显示所有复选框的列表，后面有一些灰色的东西（我假设是切换器）。也许我在标记中做了一些不太聪明的事情。

<ToggleButton HorizontalAlignment="Left" 
              Margin="550,62,0,0" 
              VerticalAlignment="Top"
              Width="100">
  <ListBox x:Name="listBox1" 
             HorizontalAlignment="Left" 
             Height="100"
             VerticalAlignment="Top" Width="100">
    <CheckBox x:Name="checkBox3" Content="CheckBox"/>
    <CheckBox x:Name="checkBox4" Content="CheckBox"/>
  </ListBox>
</ToggleButton>

重点是实现something like this，但它需要是一个标准的WPF控件（所有selected项目的连接线很好，但不是必须的）。另外，我已经阅读了有关绑定和处理尚未完全开发的投诉，我感到有点怀疑。

Answer 1

使用Exapander控件可以实现单选后不关闭弹窗的多选。

为了理解请单独运行此代码。

xaml

  <Window.Resources>
    <ControlTemplate x:Key="ComboboxToggleButton" TargetType="{x:Type ToggleButton}">
        <Grid Background="{Binding Background,RelativeSource={RelativeSource AncestorType={x:Type ComboBox}}}">
            <Grid.ColumnDefinitions>
                <ColumnDefinition />
                <ColumnDefinition Width="35" />
            </Grid.ColumnDefinitions>
            <Border x:Name="Border" Grid.ColumnSpan="2" Background="Transparent"  BorderBrush="Black" BorderThickness="{Binding BorderThickness,RelativeSource={RelativeSource TemplatedParent}}"/>
            <Path x:Name="Arrow" Grid.Column="1" Opacity="1" Stroke="Black" StrokeThickness="1.5" HorizontalAlignment="Center" VerticalAlignment="Center" Data="M 0 0 L 6 6 L 12 0" />
            <Path x:Name="Arrow_checked" Opacity="0" Grid.Column="1" Fill="Black" Stroke="Black" StrokeThickness="1" HorizontalAlignment="Center" VerticalAlignment="Center" Data="M 0 0 L 6 6 L 12 0 Z" />
            <ContentPresenter TextElement.FontFamily="Segoe Ui Dark" TextElement.FontSize="18" TextElement.Foreground="Black" VerticalAlignment="Center"  Grid.Column="0" Margin="10,0,0,0" HorizontalAlignment="Left" RecognizesAccessKey="True" SnapsToDevicePixels="True" />
        </Grid>
        <ControlTemplate.Triggers>
            <Trigger Property="ToggleButton.IsMouseOver" Value="true">
                <Setter TargetName="Border" Property="Background" Value="Gray" />
                <Setter TargetName="Border" Property="BorderThickness" Value="1.2" />
            </Trigger>
            <Trigger Property="IsChecked" Value="False">
                <Setter Property="Opacity" Value="1" TargetName="Arrow"/>
                <Setter Property="Opacity" Value="0" TargetName="Arrow_checked"/>
            </Trigger>
            <Trigger Property="ToggleButton.IsChecked" Value="true">
                <Setter Property="Opacity" Value="0" TargetName="Arrow"/>
                <Setter Property="Opacity" Value="1" TargetName="Arrow_checked"/>
            </Trigger>
            <Trigger Property="IsEnabled" Value="False">
                <Setter TargetName="Border" Property="Background" Value="Gray" />
                <Setter TargetName="Border" Property="BorderBrush" Value="White" />
            </Trigger>
        </ControlTemplate.Triggers>
    </ControlTemplate>

    <Style TargetType="{x:Type Expander}">
        <Setter Property="FontFamily" Value="Segoe Ui Dark"></Setter>
        <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
        <Setter Property="VerticalContentAlignment" Value="Stretch"/>
        <Setter Property="MaxHeight" Value="200"></Setter>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type Expander}">
                    <DockPanel>
                        <ToggleButton x:Name="HeaderSite" Height="35" Background="{TemplateBinding Background}" ContentTemplate="{TemplateBinding HeaderTemplate}" ContentTemplateSelector="{TemplateBinding HeaderTemplateSelector}" Content="{TemplateBinding Header}" DockPanel.Dock="Top" Foreground="Black"   FontStyle="{TemplateBinding FontStyle}"   FontFamily="Segoe UI Dark" 
                     IsChecked="{Binding IsExpanded, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"   Template="{StaticResource ComboboxToggleButton}" />
                        <Border  BorderThickness="0,4.5,0,0" BorderBrush="Transparent">
                            <Border x:Name="bod" BorderBrush="Transparent" SnapsToDevicePixels="True" BorderThickness="1">
                                <ContentPresenter x:Name="ExpandSite"  Focusable="false" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"  Visibility="Collapsed" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />
                            </Border>
                        </Border>
                    </DockPanel>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsExpanded" Value="true">
                            <Setter Property="Visibility" TargetName="ExpandSite" Value="Visible"/>
                            <Setter Property="BorderBrush" TargetName="bod" Value="Black"/>
                        </Trigger>
                        <Trigger Property="IsEnabled" Value="false">
                            <Setter Property="Foreground" Value="Gray"></Setter>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

    <Style x:Key="itemstyle"   TargetType="{x:Type ListBoxItem}">
        <Setter Property="SnapsToDevicePixels" Value="true" />
        <Setter Property="OverridesDefaultStyle"  Value="true" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="ListBoxItem">
                    <Grid x:Name="Border"  Height="40"  SnapsToDevicePixels="true">
                        <Grid.Background>
                            <SolidColorBrush Color="Transparent" />
                        </Grid.Background>
                        <ContentPresenter Name="cmb_name" TextElement.FontFamily="Segoe Ui Dark" TextElement.FontSize="18" TextElement.Foreground="Black" Margin="10,0,0,0" VerticalAlignment="Center"></ContentPresenter>
                    </Grid>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter TargetName="Border" Property="Background" Value="Gray"></Setter>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
        <Setter Property="FocusVisualStyle">
            <Setter.Value>
                <Style TargetType="Control">
                    <Setter Property="Template">
                        <Setter.Value>
                            <ControlTemplate>
                                <Border BorderBrush="{DynamicResource customBlueBrush}" BorderThickness="1" Margin="1,2,2,2" >
                                    <Rectangle Fill="{DynamicResource customBlueBrush}" Opacity="0.1"></Rectangle>
                                </Border>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                </Style>
            </Setter.Value>
        </Setter>
    </Style>

    <Style  TargetType="CheckBox" >
        <Setter Property="SnapsToDevicePixels" Value="True"></Setter>
        <Setter Property="OverridesDefaultStyle" Value="True"></Setter>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="CheckBox">
                    <Grid x:Name="ab" Background="Transparent">
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="30"/>
                            <ColumnDefinition/>
                        </Grid.ColumnDefinitions>
                        <Rectangle VerticalAlignment="Center" Height="20" Width="20"  Fill="White" HorizontalAlignment="Left"></Rectangle>
                        <Grid x:Name="checkGrid" VerticalAlignment="Center" Height="20" Width="20" Background="Black" HorizontalAlignment="Left">
                            <Viewbox Height="13" Width="13">
                                <Path x:Name="Check" SnapsToDevicePixels="True" UseLayoutRounding="True" Width="18.7969" Height="16.3094" Canvas.Left="0" Canvas.Top="1.52588e-005" Stretch="Fill" Fill="White" Data="F1 M 0.731262,8.75935L 0.106262,8.08437C 0.0354614,7.9948 0,7.8979 0,7.79375C 0,7.66875 0.0479736,7.5573 0.143799,7.45937L 1.94067,5.77187C 2.02606,5.69893 2.12708,5.66249 2.24377,5.66249C 2.30212,5.66249 2.36096,5.67397 2.42035,5.69685C 2.47974,5.71977 2.52814,5.75417 2.56567,5.79997L 7.5188,11.1406L 16.0438,0.165604C 16.1417,0.055191 16.2584,1.52588e-005 16.3938,1.52588e-005C 16.4979,1.52588e-005 16.5896,0.0322723 16.6688,0.0968475L 18.6313,1.60939C 18.6709,1.64272 18.7084,1.69011 18.7438,1.75154C 18.7792,1.813 18.7969,1.8698 18.7969,1.92189C 18.7969,2.03435 18.7646,2.1385 18.7,2.23439L 7.74377,16.3094L 0.731262,8.75935 Z " />
                            </Viewbox>
                        </Grid>
                        <Grid Background="Transparent" Grid.Column="1" IsHitTestVisible="True" HorizontalAlignment="Stretch">
                            <TextBlock VerticalAlignment="Center"  FontSize="18" FontFamily="Segoe Ui Dark" Foreground="Black"  TextTrimming="CharacterEllipsis">
                        <ContentPresenter></ContentPresenter>
                            </TextBlock>
                        </Grid>

                    </Grid>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsChecked" Value="True">
                            <Setter Property="Opacity" Value="1"  TargetName="Check"></Setter>
                        </Trigger>
                        <Trigger Property="IsChecked" Value="False">
                            <Setter Property="Opacity" Value="0" TargetName="Check"></Setter>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
        <Setter Property="FocusVisualStyle">
            <Setter.Value>
                <Style TargetType="Control">
                    <Setter Property="Template">
                        <Setter.Value>
                            <ControlTemplate>
                                <Border BorderBrush="{DynamicResource customBlueBrush}" SnapsToDevicePixels="True" BorderThickness="1" Margin="-5,1,3,1" />
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                </Style>
            </Setter.Value>
        </Setter>
    </Style>
</Window.Resources>

<Grid x:Name="gd" >
    <Expander Width="500">
        <Expander.Header>
            <ListBox Background="Transparent" IsHitTestVisible="False" BorderBrush="Transparent" ScrollViewer.HorizontalScrollBarVisibility="Hidden" ScrollViewer.VerticalScrollBarVisibility="Disabled"  BorderThickness="0" ItemsSource="{Binding ElementName=lst,Path=SelectedItems}">
                <ListBox.ItemsPanel>
                    <ItemsPanelTemplate>
                        <WrapPanel  Orientation="Horizontal"></WrapPanel>
                    </ItemsPanelTemplate>
                </ListBox.ItemsPanel>
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <TextBlock Text="{Binding ContentData}"/>
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>
        </Expander.Header>
        <Expander.Content>
            <ListBox  Background="Transparent" ItemContainerStyle="{StaticResource itemstyle}" HorizontalContentAlignment="Stretch" x:Name="lst" SelectionMode="Multiple">
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <CheckBox x:Name="checkBox"  IsChecked="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ListBoxItem}}, Path=IsSelected}" Content="{Binding ContentData}"></CheckBox>
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>
        </Expander.Content>
    </Expander>
</Grid>

c#代码

  public partial class Window1 : Window
{
    public Window1()
    {
        InitializeComponent();          
        ObservableCollection<Customer> custdata = new ObservableCollection<Customer>();
        custdata.Add(new Customer() { ContentData = "content1" });
        custdata.Add(new Customer() { ContentData = "content2" });
        custdata.Add(new Customer() { ContentData = "content3" });
        custdata.Add(new Customer() { ContentData = "content4" });
        custdata.Add(new Customer() { ContentData = "content5" });
        custdata.Add(new Customer() { ContentData = "content6" });
        lst.ItemsSource = custdata;
    }
}
public class Customer
{
    public string ContentData { get; set; }
}

结果

Answer 2

康拉德，

我还决定以这种方式使用 ComboBox，因为代码非常简单。我发现保持 ComboBox 弹出窗口打开的最简单方法是连接到 ComboBox 项模板中控件的 PreviewMouseDown 事件。自己处理行为，然后将鼠标事件标记为已处理。对我很有用。在下面的示例中，FilterItems 中的每个对象都是一个带有 Text 属性和 IsChecked 属性.

的简单视图模型

<ComboBox IsEditable="True" IsReadOnly="False" ItemsSource="{Binding FilterItems}">
    <ComboBox.ItemTemplate>
        <DataTemplate>
            <CheckBox IsChecked="{Binding IsChecked}" Content="{Binding Text}" 
                      PreviewMouseDown="FilterComboBox_PreviewMouseDown"/>
        </DataTemplate>
    </ComboBox.ItemTemplate>
</ComboBox>

然后我的事件处理程序是：

private void FilterComboBox_PreviewMouseDown(object sender, MouseButtonEventArgs e)
{
    var cb = sender as CheckBox;
    if (cb != null)
    {
        cb.IsChecked = !cb.IsChecked;
        e.Handled = true;
    }
}

CheckComboBox：如何防止组合框在单击选择后关闭？

CheckComboBox : How to prevent a combobox from closing after a selection is clicked?

c#

wpf

xaml

checkbox

combobox