WPF 中为应用程序中的不同状态实现交通灯颜色的最佳方法是什么？

Question

如果一个应用程序有一组状态。例如

人员状态（活跃[绿色]、不活跃[橙色]、已故[红色]）
文档状态（未读[橙色]、已读[绿色]、已删除[红色]）

如您所知，这两组状态使用相同的颜色。你们建议在 WPF 中实现什么。我正在重构过程中，希望确保它是可重用的、可读的和可理解的。

Answer 1

对于 StatusType（枚举？）和颜色之间的每个映射，我将实现一个从每个枚举到画笔的 ValueConverter。

如果要重复使用颜色，请创建画笔资源并将资源分配给转换器。

public class PersonStatusToBrushConverter : DependencyObject, IValueConverter
{
    public static readonly DependencyProperty WhenActiveProperty =
        DependencyProperty.Register("WhenActive", typeof(Brush), typeof(PersonStatusToBrushConverter),
            new PropertyMetadata(Brushes.Green));

    public static readonly DependencyProperty WhenInactiveProperty =
        DependencyProperty.Register("WhenInactive", typeof(Brush), typeof(PersonStatusToBrushConverter),
            new PropertyMetadata(Brushes.Orange));

    public static readonly DependencyProperty WhenDeceasedProperty =
        DependencyProperty.Register("WhenDeceased", typeof(Brush), typeof(PersonStatusToBrushConverter),
            new PropertyMetadata(Brushes.Red));

    public Brush WhenDeceased
    {
        get { return (Brush) this.GetValue(WhenDeceasedProperty); }
        set { this.SetValue(WhenDeceasedProperty, value); }
    }

    public Brush WhenInactive
    {
        get { return (Brush) this.GetValue(WhenInactiveProperty); }
        set { this.SetValue(WhenInactiveProperty, value); }
    }

    public Brush WhenActive
    {
        get { return (Brush) this.GetValue(WhenActiveProperty); }
        set { this.SetValue(WhenActiveProperty, value); }
    }


    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        switch((PersonStatus)value)
        {
            case PersonStatus.Active:
                return this.WhenActive;
            case PersonStatus.Inactive:
                return this.WhenInactive;
            case PersonStatus.Deceased:
                return this.WhenDeceased;
            default:
                return DependencyProperty.UnsetValue;
        }
    }

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

对于文档状态，我会创建一个类似的转换器。

要将其与资源一起使用：

<UserControl ...
    xmlns:conv="clr-namespace:StatusConverters" >
    <UserControl.Resources>
        <SolidColorBrush x:Key="GreenBrush" Color="Green"/>
        <SolidColorBrush x:Key="OrangeBrush" Color="Orange"/>
        <SolidColorBrush x:Key="RedBrush" Color="Red"/>
        <conv:PersonStatusToBrushConverter 
            x:Key="personStatusConverter"
            WhenActive="{StaticResource GreenBrush}" 
            WhenInactive="{StaticResource OrangeBrush}" 
            WhenDeceased="{StaticResource RedBrush}"/>
        <conv:DocumentStatusToBrushConverter 
            x:Key="documentStatusConverter"
            WhenUnread="{StaticResource GreenBrush}" 
            WhenRead="{StaticResource OrangeBrush}" 
            WhenDeleted="{StaticResource RedBrush}"/>
    </UserControl.Resources>
    <Ellipse 
         Fill="{Binding Status, Converter={StaticResource personStatusToBrushConverter}" 
         Width="50" Height="50" />

WPF 中为应用程序中的不同状态实现交通灯颜色的最佳方法是什么？

What is the best way in WPF to implement traffic light colours for different status's in the application?

wpf

colors

status