背景:实现Slider拖动可以调整rgb
单转换器:WPF中数据绑定转换器Converter-CSDN博客
在View中:
<StackPanel Orientation="Vertical"><Slider x:Name="slider_R" Minimum="0" Maximum="255" Width="200" Margin="20"/><Slider x:Name="slider_G" Minimum="0" Maximum="255" Width="200" Margin="20"/><Slider x:Name="slider_B" Minimum="0" Maximum="255" Width="200" Margin="20"/><Path VerticalAlignment="Center" HorizontalAlignment="Center"><Path.Data><EllipseGeometry Center="50, 50" RadiusX="50" RadiusY="50"/></Path.Data><Path.Fill><MultiBinding Converter="{StaticResource rmc}"><Binding ElementName="slider_R" Path="Value"/><Binding ElementName="slider_G" Path="Value"/><Binding ElementName="slider_B" Path="Value"/></MultiBinding></Path.Fill></Path>
</StackPanel>
-- Fill中绑定的资源是Window.Resources中引入进来的转换器key
-- 转换器返回的是一个SolidBrush,其实就是相当于在这个地方写个SolidBrush
转换器中:
public class rgbMultiConventer : IMultiValueConverter
{public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture){if (values==null || values.Length < 2){return null;}byte r = System.Convert.ToByte(values[0]);byte g = System.Convert.ToByte(values[1]);byte b = System.Convert.ToByte(values[2]);Color color = Color.FromRgb(r, g, b);return new SolidColorBrush(color);}public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture){throw new NotImplementedException();}
}
-- 就是转换器类接上接口“IMultiValueConverter”