Question

所以我有一个应用程序，我可以配置我希望应用程序看起来像app.config的方式。该应用程序包含一个用户控件，我打电话给＃34; Callout＆＃34;用于呼叫下一个客户。我希望在下一个客户属性更改时为此用户控件的背景设置动画。

我知道怎么做，我唯一的问题是我在转换器上接收了它的背景配置并将它们转换为Solid，LinearGradient或RadialGradient Brush。为了给渐变停止设置动画，我需要注册他们的名字，而我无法在转换器中访问该方法。

如何在转换器上实现此效果？我怎么能在其中注册名字？

以下是相关的代码：

位于app.config中的部分configSection：

<callout key="PacientCallout"
           title="Paciente" 
           placeholder="N/D"
           border="#FFFFC20E">
    <titleFont family="/Clinical.Resources;Component/Fonts/#Dax-Regular"
               size="40"
               isCustom="true">
      <colors type="Solid">
        <color key="TitleColor" code="White" />
      </colors>
    </titleFont>
    <textFont family="/Clinical.Resources;Component/Fonts/#Dax-Regular"
               size="30"
               isCustom="true">
      <colors type="Solid">
        <color key="TextColor" code="White" />
      </colors>
    </textFont>
    <!--Possible values for type are Solid, LinearGradient or RadialGradient--> 
    <background type="LinearGradient">
        <color key="StarBlue" code="#FF2A398C" />
        <color key="EndBlue" code="#FF0D174F" />
    </background>
  </callout>

我正在放置所有用户控件元素的边框：

 <Border CornerRadius="30,0,0,30" 
        Margin="0,15,0,15"
        BorderBrush="{Binding Border,
                              Converter={StaticResource StringToBrushConverter},
                              Mode=TwoWay,
                              PresentationTraceSources.TraceLevel=High}" 
        Background="{Binding Background,
                             Converter={StaticResource StringToGradientStopConverter},
                             Mode=TwoWay,
                             PresentationTraceSources.TraceLevel=High}"
        BorderThickness="2" 
        Width="400" 
        Height="150">
    <Border.Triggers>

    </Border.Triggers>
    <Border.BitmapEffect>
        <DropShadowBitmapEffect Color="Black" 
                                Direction="225" 
                                ShadowDepth="6"
                                Opacity="0.5" />
    </Border.BitmapEffect>

    <!-- More User Control stuff in here -->

    </Border>

背景转换器配置为刷子：

public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        if ((bool)(DesignerProperties.IsInDesignModeProperty.GetMetadata(typeof(DependencyObject)).DefaultValue))
            return null;

        var gradient = value as Clinical.Core.Configuration.ColorCollection;
        double offset = 0;
        Brush brush;
        switch (gradient.Type)
        {
            case BackgroundType.Solid:
                brush = (SolidColorBrush)new BrushConverter().ConvertFrom(gradient[0].Code);
                break;
            case BackgroundType.LinearGradient:
                LinearGradientBrush linearGradient = new LinearGradientBrush();
                linearGradient.StartPoint = new Point(0.5, 0);
                linearGradient.EndPoint = new Point(0.5, 1);
                linearGradient.MappingMode = BrushMappingMode.RelativeToBoundingBox;

                foreach (Clinical.Core.Configuration.ColorElement color in gradient)
                {
                    var colorCode = (Color)ColorConverter.ConvertFromString(color.Code);
                    var gradientStop = new GradientStop(colorCode, offset);
                    linearGradient.GradientStops.Add(gradientStop);
                    offset += 1d / ((double)gradient.Count-1);
                }
                brush = linearGradient;
                break;
            case BackgroundType.RadialGradient:
                RadialGradientBrush radialGradient = new RadialGradientBrush();
                radialGradient.GradientOrigin = new Point(0.75,0.15);
                radialGradient.MappingMode = BrushMappingMode.RelativeToBoundingBox;
                foreach (Clinical.Core.Configuration.ColorElement color in gradient)
                {
                    var colorCode = (Color)ColorConverter.ConvertFromString(color.Code);
                    var gradientStop = new GradientStop(colorCode, offset);
                    radialGradient.GradientStops.Add(gradientStop);
                    offset += 1d / ((double)gradient.Count-1);
                }
                brush = radialGradient;
                break;
            default:
                brush = null;
                break;
        }

        return brush;
    }

Answer 1

在您的情况下，最好的解决方案是使用MultiBinding而不是Binding，如下所示：

   <Border.BorderBrush>
            <MultiBinding Converter="Converter={StaticResource StringToBrushConverter}">
                <MultiBinding.Bindings>
                    <Binding PresentationTraceSources.TraceLevel="High"/>
                    <Binding Path="." ElementName="border" />
                </MultiBinding.Bindings>
            </MultiBinding>
        </Border.BorderBrush>

通过这种方式，您可以将多个对象传递到转换器中。例如Path =“。”允许您传递任何控件或对象的实例。另请注意，您必须为MultiBinding实现IMultiValueConverter，而不是IValueConverter。希望这有助于你。

如何在ValueConverter上下文中注册名称？

1 个答案: