WPF ComboBox as System.Windows.Media.Colors

问题:

Wanting to get the color combobox (see image) behavior in my WPF ListView column.

Can someone help me get this started? I am comfortable with ListView binding but not sure how to implement this.

EDIT:

 xmlns:System="clr-namespace:System;assembly=mscorlib"

<ObjectDataProvider MethodName="GetValues"
                    ObjectType="{x:Type System:Enum}"
                    x:Key="ColorList">
   <ObjectDataProvider.MethodParameters>
       <x:Type TypeName="Windows.Media.Color" />
   </ObjectDataProvider.MethodParameters>
</ObjectDataProvider>

Tells me type provided must be an enum.

Best Answer I have found: How can I list colors in WPF with XAML?

回答1:

ComboBox with ItemTemplate

You will have to use ItemTemplate for you ComboBox items:

    <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>

Brush converter

Also, you will need a color to brush converter, because binding doesn't do it automatically:

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();
    }
}

Color name - color pair creation

And here is how you can create the color Name - color pairs (currently it is an instance method in the main Window class, but you can refactor it to some helper class):

    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)));
    }

Window code

And this is the window:

/// <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;
    }
}

---

ObjectDataProvider

Some code file:

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 object data provider:

...
xmlns:someNamespace="clr-namespace:SomeNamespace"
...
<ObjectDataProvider MethodName="GetColors"
                    ObjectType="{x:Type someNamespace.ColorHelper}"
                    x:Key="ColorList">
</ObjectDataProvider>

XAML comboBox:

<ComboBox ItemsSource="{Binding ColorList}" ...

回答2:

Should be something like this :

 <ComboBox ItemsSource="{Binding ItemSourceObs}">     
            <ComboBox.ItemTemplate>
                <DataTemplate>
                    <StackPanel Orientation="Horizontal">
                        <Rectangle Fill="{Binding Color}" Height="10"  Width="10" />
                        <TextBlock Text="{Binding DisplayedText}" />
                    </StackPanel>
                </DataTemplate>
            </ComboBox.ItemTemplate>    
        </ComboBox>

Where DisplayesText and Color (type of Brushes) are properties of an object lets say A and ItemSourceObs is ObservableCollection of type A

This approach is based on MVVM pattern

Using code behind working solution :

 <ComboBox x:Name="ComboColor" Width="50" Height="50"  >     
        <ComboBox.ItemTemplate>
            <DataTemplate>
                <StackPanel Orientation="Horizontal">
                    <Rectangle Fill="{Binding Name}" Width="16" Height="16" Margin="0,2,5,2" />
                    <TextBlock Text="{Binding Name}" />
                </StackPanel>
            </DataTemplate>
        </ComboBox.ItemTemplate>    
    </ComboBox>

And code behind :

public MainWindow()
    {
        InitializeComponent();
        ComboColor.ItemsSource = typeof(Colors).GetProperties();
    }