以编程方式更改单个 ListViewItem 布局

发布于 2024-07-21 05:47:05 字数 1727 浏览 6 评论 0原文

我有一个 ListView ，其中有一个 GridView ：

<ListView x:Name="listViewPersons" ItemsSource="{Binding Path=Persons, Mode=OneWay}" IsSynchronizedWithCurrentItem="True" 
                  Height="Auto" HorizontalAlignment="Stretch" Margin="4,4,4,4" Grid.Row="4" VerticalAlignment="Stretch" Width="Auto">
            <ListView.View>
                <GridView x:Name="gridViewPersons">
                    <GridViewColumn Header="Enabled">
                        <GridViewColumn.CellTemplate>
                            <DataTemplate>
                                <StackPanel>
                                    <CheckBox HorizontalAlignment="Center" IsChecked="true" />
                                </StackPanel>
                            </DataTemplate>
                        </GridViewColumn.CellTemplate>
                    </GridViewColumn>
                    <GridViewColumn Header="Name"  DisplayMemberBinding="{Binding Path=Name}" Width="142" />
                    <GridViewColumn Header="Age"  DisplayMemberBinding="{Binding Path=Age}" Width="142" />
                    <GridViewColumn Header="Gender"  DisplayMemberBinding="{Binding Path=Gender}" Width="142" />
                </GridView>
            </ListView.View>
        </ListView>

我希望能够以编程方式更改每个 ListViewItem （或grid）背景或前景为我想要的任何颜色，例如

listViewPersons.Items[0].Background = Brush.Red;
listViewPersons.Items[1].Background = Brush.Blue;
listViewPersons.Items[2].Background = Brush.Green

我知道前面的代码行不起作用，但它几乎解释了我想要实现的目标。有什么帮助吗？

谢谢！

原文

I have a ListView with a GridView in it:

<ListView x:Name="listViewPersons" ItemsSource="{Binding Path=Persons, Mode=OneWay}" IsSynchronizedWithCurrentItem="True" 
                  Height="Auto" HorizontalAlignment="Stretch" Margin="4,4,4,4" Grid.Row="4" VerticalAlignment="Stretch" Width="Auto">
            <ListView.View>
                <GridView x:Name="gridViewPersons">
                    <GridViewColumn Header="Enabled">
                        <GridViewColumn.CellTemplate>
                            <DataTemplate>
                                <StackPanel>
                                    <CheckBox HorizontalAlignment="Center" IsChecked="true" />
                                </StackPanel>
                            </DataTemplate>
                        </GridViewColumn.CellTemplate>
                    </GridViewColumn>
                    <GridViewColumn Header="Name"  DisplayMemberBinding="{Binding Path=Name}" Width="142" />
                    <GridViewColumn Header="Age"  DisplayMemberBinding="{Binding Path=Age}" Width="142" />
                    <GridViewColumn Header="Gender"  DisplayMemberBinding="{Binding Path=Gender}" Width="142" />
                </GridView>
            </ListView.View>
        </ListView>

I want to be able to programmatically change each of the ListViewItems (or the rows in the grid) backgrounds or foregrounds to any color I want, for instance

listViewPersons.Items[0].Background = Brush.Red;
listViewPersons.Items[1].Background = Brush.Blue;
listViewPersons.Items[2].Background = Brush.Green

I know the previous lines of code don't work, but it pretty much explains what I want to achieve. Any help?

Thanks!

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粉红×色少女 2024-07-28 05:47:05

这种方法怎么样：

将 ForegroundColor 和背景颜色绑定到 Persons 中的属性。我们将此属性称为 PersonStatus，并将其类型设置为状态枚举，仅用于此示例。

确保此人员实现 INotifyPropertyChanged，并且此属性的设置器引发 ProperyChanged 事件。该属性将如下所示：

公共状态 PersonStatus 
  { 
      得到 
      { 
          返回状态； 
      } 
      放 
      { 
          if（值！=状态） 
          { 
              状态=值； 
              if (属性更改！= null) 
                  PropertyChanged(this, new PropertyChangedEventArgs("PersonStatus")); 
          } 
      } 
  }

创建一个 IValueConverter 接受 Status 类型并返回 Brushes.Black、Brushes.Red 等。如下所示：

公共类 StatusToColorConverter : IValueConverter  
  { 
      公共对象转换（对象值，类型targetType，对象参数，System.Globalization.CultureInfo文化） 
      { 
          if (目标类型！= typeof(状态)) 
              throw new InvalidOperationException("targetType 必须是 Status"); 

          状态status = (Status)值； 

          开关（状态） 
          { 
              案例状态。新： 
                  返回画笔.黑色； 
              案例状态.专业： 
                  返回 Brushes.Blue； 
              案例状态。删除： 
                  返回 Brushes.Red； 
              默认： 
                  返回画笔.黑色； 
          } 
      } 

      公共对象ConvertBack（对象值，类型targetType，对象参数，System.Globalization.CultureInfo文化） 
      { 
          抛出新的NotImplementedException（）； 
      }  
  }

How about this approach:

Bind ForegroundColor and Background color to a property in Persons. Let's call this property PersonStatus, and set its type to a status enum, just for this example.

Ensure that this Persons implements INotifyPropertyChanged, and the setter for this property raises a ProperyChanged event. The property will look like this:

public Status PersonStatus
{
    get
    {
        return status;
    }
    set
    {
        if (value != status)
        {
            status= value;
            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs("PersonStatus"));
        }
    }
}

Create an IValueConverter that takes the type of Status and returns a Brushes.Black, Brushes.Red, etc. Something like this:

public class StatusToColorConverter : IValueConverter 
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        if (targetType != typeof(Status))
            throw new InvalidOperationException("targetType must be Status");

        Status status = (Status)value;

        switch (status)
        {
            case Status.New:
                return Brushes.Black;
            case Status.Professional:
                return Brushes.Blue;
            case Status.Delete:
                return Brushes.Red;
            default:
                return Brushes.Black;
        }
    }

    public object ConvertBack(object value, Type targetType, object parameter,  System.Globalization.CultureInfo culture)
    {
        throw new NotImplementedException();
    } 
}

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