Question

我创造了自己的组合框样式以及stylign组合框项目。下拉列表需要显示一些带按钮的项目，而其他没有我的项目的项目是动态创建的，如下所示：

            ComboBoxItem typeItem = new ComboBoxItem();
            typeItem.Content = "Test";
            typeItem.Tag = i;
            MyCombobox.Items.Add(typeItem);

我的问题是如何将这种风格应用于某些项目，而不是其他项目，我的两个组合框架是否在下面？

<Style x:Key="{x:Type ComboBoxItem}" TargetType="{x:Type ComboBoxItem}">
    <Setter Property="HorizontalContentAlignment" Value="Left" />
    <Setter Property="VerticalContentAlignment" Value="Top" />
    <Setter Property="MinHeight" Value="{DynamicResource ResourceKey=MinimumIteractSizeDips}" />
    <Setter Property="MinWidth" Value="{DynamicResource ResourceKey=MinimumIteractSizeDips}" />
    <Setter Property="Foreground" Value="Black"/>
</Style>

<Style x:Key="MyComboBoxItem" TargetType="{x:Type ComboBoxItem}">
    <Setter Property="HorizontalContentAlignment" Value="Left" />
    <Setter Property="VerticalContentAlignment" Value="Top" />
    <Setter Property="MinHeight" Value="{DynamicResource ResourceKey=MinimumIteractSizeDips}" />
    <Setter Property="MinWidth" Value="{DynamicResource ResourceKey=MinimumIteractSizeDips}" />
    <Setter Property="Foreground" Value="Black"/>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="ComboBoxItem">
                <Grid>
                    <Label Content="{TemplateBinding Content}" Foreground="Black" Background="White" Height="26" HorizontalAlignment="Left" VerticalAlignment="Center" Grid.Row="0" Grid.Column="0"/>
                    <Button Grid.Column="2" Grid.Row="0" Content="Settings" Height="23" HorizontalAlignment="Left" Margin="2" Name="PositionSettings" VerticalAlignment="Center" Width="57"/>
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

Answer 1

检查StyleSelector课程。

public class MyStyleSelector : StyleSelector
{
     public override Style SelectStyle(object item, DependencyObject container)
    {
        var element = container as FrameworkElement;
        var myVm = item as MyViewModel;

        if(myVm.EditMode)
            return element.FindResource("TemplateWithButtons") as DataTemplate
        return element.FindResource("TemplateNormal") as DataTemplate

    }
}

并在xaml中为您的选择器定义资源

<MyStyleSelector x:Key="myStyleSelector"/>

并将其应用于您的组合框。

<ComboBox StyleSelector="{StaticResource myStyleSelector}"/>

顺便说一句。 x：与TargetType类型相同的密钥是多余的。

最后注意：您不应该为此覆盖样式。你想要的是DataTemplate和DataTemplate选择器。此外，您不应该将Content（类型对象）绑定到标签文本（类型字符串），ContentPresenter是这里的方式。

带按钮的WPF ComboboxItems

1 个答案: