c#-WPF和XAML中的OxyPlot线注释可见性

我已经在XAML中使用Plot(而不是PlotView)配置了Oxyplot. (我在单个属性上使用Binding,而不是在完整的PlotModel上使用.)

该配置使用6个LineAnnotations,我想可选地显示或隐藏它们.

我已经使用Binding将LineAnnotations的Visibility属性连接到ViewModel中的属性.这些属性是布尔值,并且我使用了转换器将值转换为Visibility.Collapsed或Visibility.Visible(但我也可以使用Visibility类型定义一个属性).

这行不通. LineAnnotations始终可见.

实际上,我认为LineAnnotation的Visibility属性根本不起作用.

有人可以确认这个问题吗？

有没有其他方法可以基于ViewModel中的属性显示或隐藏LineAnnotations？

我宁愿坚持使用XAML配置,而不是在代码中添加和删除LineAnnotations.

更新资料

根据要求,一些代码

Xaml

<oxy:Plot Grid.Row="1">
  <oxy:Plot.Axes>
    <oxy:LinearAxis Key="yAxis"
                    Position="{Binding Path=XAxisInverted, Converter={StaticResource BoolToAxisPosition_fl_tr}}"
                    Minimum="{Binding YAxis_Min}"
                    Maximum="{Binding YAxis_Max}"
                    MajorGridlineStyle="Dot"
                    MajorGridlineColor="LightGray"
                    Title="Velocity [km/h]" />
    <oxy:LinearAxis Key="xAxis"
                    Position="Bottom"
                    Minimum="{Binding XAxisNumericMin}"
                    Maximum="{Binding XAxisNumericMax}"
                    StartPosition="{Binding Path=XAxisInverted, Converter={StaticResource BoolToInt_f0_t1}}"
                    EndPosition="{Binding Path=XAxisInverted, Converter={StaticResource BoolToInt_f1_t0}}"
                    MajorGridlineStyle="Dot"
                    MajorGridlineColor="LightGray"
                    Title="Position [m]" />
  </oxy:Plot.Axes>
  <oxy:Plot.Series>
    <oxy:LineSeries ItemsSource="{Binding PointsRef1}"
                    DataFieldX="X"
                    DataFieldY="Y"
                    StrokeThickness="1"
                    MarkerSize="0"
                    LineStyle="Solid"
                    Color="DarkGray"
                    MarkerType="None"/>
    <oxy:LineSeries ItemsSource="{Binding PointsRef2}"
                    DataFieldX="X"
                    DataFieldY="Y"
                    StrokeThickness="1"
                    MarkerSize="0"
                    LineStyle="Solid"
                    Color="DarkGray"
                    MarkerType="None"/>
    <oxy:LineSeries ItemsSource="{Binding PointsBlack}"
                    DataFieldX="X"
                    DataFieldY="Y"
                    StrokeThickness="1"
                    MarkerSize="0"
                    LineStyle="Solid"
                    Color="Black"
                    MarkerType="None"/>
    <oxy:LineSeries ItemsSource="{Binding PointsRed}"
                    DataFieldX="X"
                    DataFieldY="Y"
                    StrokeThickness="1"
                    MarkerSize="0"
                    LineStyle="Solid"
                    Color="Red"
                    MarkerType="None"/>
    <oxy:LineSeries ItemsSource="{Binding PointsBlue}"
                    DataFieldX="X"
                    DataFieldY="Y"
                    StrokeThickness="1"
                    MarkerSize="0"
                    LineStyle="Solid"
                    Color="Blue"
                    MarkerType="None"/>
    <oxy:LineSeries ItemsSource="{Binding PointsGreen}"
                    DataFieldX="X"
                    DataFieldY="Y"
                    StrokeThickness="1"
                    MarkerSize="0"
                    LineStyle="Solid"
                    Color="Green"
                    MarkerType="None"/>
  </oxy:Plot.Series>
  <oxy:Plot.Annotations>
    <oxy:LineAnnotation x:Name="BrakePosRear"   Type="Vertical" Color="{Binding BrakePosRear_1_Color}"  Visibility="{Binding Path=BrakePosRear_1_Enabled,  Converter={StaticResource BoolToVisibility}}" X="{Binding BrakePosRear_1_Value}"  local:AnnotationDragableBehavior.IsDragable="True" />
    <oxy:LineAnnotation x:Name="BrakePosFront"  Type="Vertical" Color="{Binding BrakePosFront_1_Color}" Visibility="{Binding Path=BrakePosFront_1_Enabled, Converter={StaticResource BoolToVisibility}}" X="{Binding BrakePosFront_1_Value}" local:AnnotationDragableBehavior.IsDragable="True" />
    <oxy:LineAnnotation x:Name="RefPos"         Type="Vertical" Color="{Binding RefPos_1_Color}"        Visibility="{Binding Path=RefPos_1_Enabled,        Converter={StaticResource BoolToVisibility}}" X="{Binding RefPos_1_Value}"        local:AnnotationDragableBehavior.IsDragable="True" />
    <oxy:LineAnnotation x:Name="BrakePosRear2"  Type="Vertical" Color="{Binding BrakePosRear_2_Color}"  Visibility="{Binding Path=BrakePosRear_2_Enabled,  Converter={StaticResource BoolToVisibility}}" X="{Binding BrakePosRear_2_Value}"  local:AnnotationDragableBehavior.IsDragable="True" />
    <oxy:LineAnnotation x:Name="BrakePosFront2" Type="Vertical" Color="{Binding BrakePosFront_2_Color}" Visibility="{Binding Path=BrakePosFront_2_Enabled, Converter={StaticResource BoolToVisibility}}" X="{Binding BrakePosFront_2_Value}" local:AnnotationDragableBehavior.IsDragable="True" />
    <oxy:LineAnnotation x:Name="RefPos2"        Type="Vertical" Color="{Binding RefPos_2_Color}"        Visibility="{Binding Path=RefPos_2_Enabled,        Converter={StaticResource BoolToVisibility}}" X="{Binding RefPos_2_Value}"        local:AnnotationDragableBehavior.IsDragable="True" />
  </oxy:Plot.Annotations>
</oxy:Plot>

类型转换器

class BoolToVisibility : IValueConverter
{
  public object Convert( object value, Type targetType, object parameter, CultureInfo culture )
  {
    return System.Convert.ToBoolean ( value ) ? Visibility.Visible : Visibility.Collapsed ;
  }

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

我还有一个附加的行为来处理LineAnnotation上的鼠标事件(这很酷),但是我认为这并不重要.

我也尝试过直接在XAML中指定Visibility =“ Collapsed”(以及“ Hidden”),但是它没有任何效果.

即使绑定不起作用,在XAML中硬编码值也应该起作用.

解决方法:

在OxyPlot和OxyPlot.Wpf的当前实现中,这将不起作用.

类OxyPlot.Wpf.LineAnnotation是内部类OxyPlot.LineAnnotation的包装.要处理Visiblilty属性,必须将其映射到内部LineAnnotation类的适当属性.

有两个问题. Wpf.LineAnnotation不仅不处理Visiblilty属性,而且LineAnnotation类中没有可将其映射到的基础属性. LineAnnotation类似乎没有任何隐藏自身的概念.

这是OxyPlot和XAML之间的不匹配.正如jstreet所指出的,LineAnnotation根本不会出现在可视树中.

标签：oxyplot,wpf,xaml,c,mvvm
来源： https://codeday.me/bug/20191118/2024557.html