Question

见下图，如何使下拉列表边框与实际组合框对齐？

这是Combobox的代码，它使用自定义的ComboBoxItem样式，

<ComboBox Grid.Row="0" Grid.Column="0" ItemsSource="{Binding ASDevicesView, Mode=OneWay , UpdateSourceTrigger=PropertyChanged}"  AutomationProperties.AutomationId="4314"
                      SelectedItem="{Binding SDevice}" IsEditable="True" Text="{Binding SearchText}" MaxDropDownHeight="166" ItemContainerStyle="{StaticResource MyComboBoxItemStyle}">
    <ComboBox.Style>
        <Style TargetType="{x:Type ComboBox}">
            <Style.Triggers>
                <Trigger Property="IsKeyboardFocusWithin" Value="True">
                    <Setter Property="IsDropDownOpen" Value="true" />
                </Trigger>
            </Style.Triggers>
        </Style>
    </ComboBox.Style>
</ComboBox>

这是ComboBoxItem样式的代码，

<Style x:Key="MyComboBoxItemStyle" BasedOn="{StaticResource {x:Type ComboBoxItem}}" TargetType="{x:Type ComboBoxItem}">
    <Setter Property="HorizontalContentAlignment" Value="Center" />
    <Setter Property="VerticalContentAlignment" Value="Center" />
    <Setter Property="RenderOptions.ClearTypeHint" Value="Enabled" />
    <Setter Property="Width" Value="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=ActualWidth}" />
    <Setter Property="Height" Value="40" />
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="ComboBoxItem">
                <Grid Background="Transparent" >
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="36"/>
                        <ColumnDefinition Width="AUTO"/>
                    </Grid.ColumnDefinitions>
                    <Grid.RowDefinitions>
                        <RowDefinition Height="AUTO"/>
                    </Grid.RowDefinitions>
                    <Image Source="{Binding Icon}" Width="12" Height="12" Margin="3,3,3,3" Grid.Row="0" Grid.Column="0"/>
                    <TextBlock Text="{Binding DName}" Grid.Row="0" Grid.Column="1" HorizontalAlignment="Left"  VerticalAlignment="Center" FontWeight="Bold"/>
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

Answer 1

我认为问题在于ComboBox不是TemplatedParent的{{1}}（实际上是例如在此comment中指出的），因此最好进行搜索它明确地：

ComboBoxItem

如何将“组合框”下拉列表宽度设置为它所属的组合框？

1 个答案: