带有 ItemTemplate 的组合框
您将不得不为您的 ComboBox 项目使用 ItemTemplate:
<ComboBox ItemsSource="{Binding NamedColors}"
xmlns:converters="clr-namespace:TestLab.WPF">
<ComboBox.Resources>
<converters:ColorToSolidBrushConverter x:Key="ColorToBrush"/>
</ComboBox.Resources>
<ComboBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<Border BorderThickness="0" Height="20" Width="20"
Background="{Binding Value, Converter={StaticResource ColorToBrush}}"/>
<TextBlock Text="{Binding Key}"/>
</StackPanel>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
刷子转换器
此外,您将需要一个颜色到笔刷转换器,因为绑定不会自动完成:
public class ColorToSolidBrushConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
return new SolidColorBrush((Color)value);
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
颜色名称 - 颜色对创建
下面是如何创建颜色名称 - 颜色对(目前它是主 Window 类中的一个实例方法,但您可以将其重构为一些帮助类):
private IEnumerable<KeyValuePair<String, Color>> GetColors()
{
return typeof(Colors)
.GetProperties()
.Where(prop =>
typeof(Color).IsAssignableFrom(prop.PropertyType))
.Select(prop =>
new KeyValuePair<String, Color>(prop.Name, (Color)prop.GetValue(null)));
}
窗口代码
这是窗口:
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
this.NamedColors = this.GetColors();
this.DataContext = this;
}
public IEnumerable<KeyValuePair<String, Color>> NamedColors
{
get;
private set;
}
}
对象数据提供者
一些代码文件:
public namespace SomeNamespace
{
public static class ColorHelper
{
public static IEnumerable<KeyValuePair<String, Color>> GetColors()
{
return typeof(Colors)
.GetProperties()
.Where(prop =>
typeof(Color).IsAssignableFrom(prop.PropertyType))
.Select(prop =>
new KeyValuePair<String, Color>(prop.Name, (Color)prop.GetValue(null)));
}
}
}
XAML 对象数据提供者:
...
xmlns:someNamespace="clr-namespace:SomeNamespace"
...
<ObjectDataProvider MethodName="GetColors"
ObjectType="{x:Type someNamespace.ColorHelper}"
x:Key="ColorList">
</ObjectDataProvider>
XAML 组合框:
<ComboBox ItemsSource="{Binding ColorList}" ...