所以我正在做一项任务,我们应该在C#和WPF中制作一个Mii Maker,我已经完成了所有工作,但问题是我们应该尽可能少地使用代码,而是使用绑定。我已经为其他一些部分创建了一个ValueConverter,它们工作得很好,但当我尝试使用MultiBind更新ArcSegment的点时(我需要一些值来保持一切居中),该点保持不变。
以下是没有多重绑定的工作代码:
XAML:
<Path Stroke="Black" StrokeThickness="3">
<Path.Data>
<PathGeometry>
<PathGeometry.Figures>
<PathFigure x:Name="LeftMouthCorner" StartPoint="221,190" IsClosed="False">
<ArcSegment x:Name="RightMouthCorner" Point="291,190" Size="{Binding ElementName=MouthHappinessSlider, Path=Value, Converter={StaticResource HappinessConverter}}">
</ArcSegment>
</PathFigure>
</PathGeometry.Figures>
</PathGeometry>
</Path.Data>
</Path>
C#:
private void MouthWidthSlider_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
{
MouthWidthLabel.Content = String.Format("Mouth Width: {0}", MouthWidthSlider.Value);
if (MouthWidthSlider != null && MouthHeightSlider != null && HeadYPosSlider != null)
{
LeftMouthCorner.StartPoint = new Point(((myCanvas.ActualWidth / 2) - MouthWidthSlider.Value), (HeadYPosSlider.Value + MouthHeightSlider.Value));
RightMouthCorner.Point = new Point(((myCanvas.ActualWidth / 2) + MouthWidthSlider.Value), (HeadYPosSlider.Value + MouthHeightSlider.Value));
}
}
我想删除该方法并将其提取到MultiValueConverter中(或两个,因为弧有两个点),并直接更新Point,而不是使用value_Changed方法,如下所示:
XAML:
<Path Stroke="Black" StrokeThickness="3">
<Path.Data>
<PathGeometry>
<PathGeometry.Figures>
<PathFigure x:Name="LeftMouthCorner" StartPoint="221,190" IsClosed="False">
<ArcSegment x:Name="RightMouthCorner" Size="{Binding ElementName=MouthHappinessSlider, Path=Value, Converter={StaticResource HappinessConverter}}">
<ArcSegment.Point>
<MultiBinding Converter="{StaticResource RMCConverter}" UpdateSourceTrigger="PropertyChanged">
<Binding ElementName="HeadYPosSlider" Path="Value" />
<Binding ElementName="MouthHeightSlider" Path="Value" />
<Binding ElementName="MouthWidthSlider" Path="Value" />
<Binding ElementName="myCanvas" Path="Width" />
</MultiBinding>
</ArcSegment.Point>
</ArcSegment>
</PathFigure>
</PathGeometry.Figures>
</PathGeometry>
</Path.Data>
</Path>
C#多值转换器:
public class RMCConverter : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
//HYP / MHS / MWS / mCW
var hyp = values[0];
var mhs = values[1];
var mws = values[2];
var mcw = values[3];
double HeadYPos = (double)hyp,
MouthHeight = (double)mhs,
MouthWidth = (double)mws,
CanvasWidth = (double)mcw;
return new Point(((CanvasWidth / 2) + MouthWidth), (HeadYPos + MouthHeight));
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
有人知道怎么这样做吗?当我打印出值时,MultiBind会接收到所有正确的值,并且我尝试返回新的Point()和格式化的String,但似乎什么都不起作用。
更多信息:没有构建错误,我在Window.Resources标签中有MultiValueConverter,所有传递到多绑定的值都来自滑块,当我使用相同的多绑定xaml代码将字符串返回到标签时,它们都是正确的(就像这样):
<Label>
<Content>
<MultiBind-Code from above goes here>
</Content>
</Label>
我需要保留工作代码并处理它吗?或者有没有办法用MultiBind更新ArcSegment的点?
好吧,我已经想好了;我制作了一个完整的MouthConverter:IMultiValueConverter,并在转换器内部创建了PathGeometry,然后返回它,链接到XAML和C#MultiBind此处的