WPF綁定到點在BezierSegment

我有一個包含double X一個視圖模型類和double Y變量，我想這個綁定到BezierSegment，似乎並不在這裏工作是我的代碼...WPF綁定到點在BezierSegment

public class TestViewModel:ViewModelBase 
{ 
    public TestViewModel() 
    { 
     TStart = new TPoint {X=20.0,Y=45.0 }; 
     TEnd = new TPoint { X = 200.0, Y = 450.0 }; 

    } 
    public TPoint TStart { get; set; } 
    public TPoint TEnd { get; set; } 

} 


public class TPoint:ViewModelBase 
{ 

    private double _X; 
    public double X 
    { 
     get { return _X; } 
     set 
     { 
      if (_X != value) 
      { 
       _X = value; 
       RaisePropertyChanged("X"); 
      } 
     } 
    } 

    private double _Y; 
    public double Y 
    { 
     get { return _Y; } 
     set 
     { 
      if (_Y != value) 
      { 
       _Y = value; 
       RaisePropertyChanged("Y"); 
      } 
     } 
    } 


}

}

和XAML

<Window.DataContext> 
    <vm:TestViewModel /> 
</Window.DataContext> 
<Grid> 
    <Path Stroke="Black" StrokeThickness="3"> 
     <Path.Data> 
      <PathGeometry> 
       <PathGeometry.Figures> 
        <PathFigureCollection> 
         <PathFigure> 
          <PathFigure.Segments> 
           <PathSegmentCollection> 
            <BezierSegment> 
             <BezierSegment.Point1> 
              <Point X="{Binding TStart.X}" Y="{Binding TStart.Y}" /> 
             </BezierSegment.Point1> 
             <BezierSegment.Point3> 
              <Point X="{Binding TEnd.X}" Y="{Binding TEnd.Y}" /> 
             </BezierSegment.Point3> 
            </BezierSegment> 
           </PathSegmentCollection> 
          </PathFigure.Segments> 
         </PathFigure> 
        </PathFigureCollection> 
       </PathGeometry.Figures> 
      </PathGeometry> 
     </Path.Data> 
    </Path> 
</Grid>

我得到一個錯誤，只能爲DependencyObject的DependencyProperties定義X和Y的綁定... ...

我不想依賴Windows Class Point ... 雖然這不會依賴於這個例子。

有人可以告訴我如何將我自己的點座標綁定到BezierSegemnt Point1 Point2 Point3？

來源

2011-04-18 silverfighter

你將不得不做這樣的：

public class TPoint:ViewModelBase 
{ 

    private double _X; 
    public double X 
    { 
     get { return _X; } 
     set 
     { 
      if (_X != value) 
      { 
       _X = value; 
       RaisePropertyChanged("X"); 
       RaisePropertyChanged("P"); 
      } 
     } 
    } 

    private double _Y; 
    public double Y 
    { 
     get { return _Y; } 
     set 
     { 
      if (_Y != value) 
      { 
       _Y = value; 
       RaisePropertyChanged("Y"); 
       RaisePropertyChanged("P"); 
      } 
     } 
    } 

    public Point P { get { return new Point(X,Y);}}  
}

，並在XAML：

<Window.DataContext> 
    <vm:TestViewModel /> 
</Window.DataContext> 
<Grid> 
    <Path Stroke="Black" StrokeThickness="3"> 
     <Path.Data> 
      <PathGeometry> 
       <PathGeometry.Figures> 
        <PathFigureCollection> 
         <PathFigure> 
          <PathFigure.Segments> 
           <PathSegmentCollection> 
            <BezierSegment Point1="{Binding TStart.P}" Point3="{Binding TEnd.P}"/> 
           </PathSegmentCollection> 
          </PathFigure.Segments> 
         </PathFigure> 
        </PathFigureCollection> 
       </PathGeometry.Figures> 
      </PathGeometry> 
     </Path.Data> 
    </Path> 
</Grid>

讓我知道，如果它的工作，我遠不及開發環境

來源

2011-04-18 17:26:08

我有這樣的事情在我的腦海，我想知道是否有可能結合X和Y不含天然Point類......我'll試試看吧.. – silverfighter 2011-04-18 17:31:46

@silverfighter BezierSegment只接受'Point'結構。因爲這不是'DependencyObject'，X和Y不是DependencyProperties，所以你不能像這樣使用它，但必須爲DependencyProperties'Point1-3'設置一個完整的'Point'。我所展示的替代方案將是一個帶MultiValueConverter的MultiBinding，它返回一個「Point」。 – 2011-04-18 17:37:17

包裝點 - >類BindingPoint實現INotifyPropertyChanged接口

public class BindingPoint : INotifyPropertyChanged 
{ 
    private Point point; 

    public BindingPoint(double x, double y) 
    { 
     point = new Point(x, y); 
    } 

    public double X 
    { 
     get { return point.X; } 
     set 
     { 
      point.X = value; 
      OnPropertyChanged(); 
      OnPropertyChanged("Point"); 
     } 
    } 

    public double Y 
    { 
     get { return point.Y; } 
     set 
     { 
      point.Y = value; 
      OnPropertyChanged(); 
      OnPropertyChanged("Point"); 
     } 
    } 

    public Point Point 
    { 
     get { return point; } 
    } 

    public event PropertyChangedEventHandler PropertyChanged; 

    [NotifyPropertyChangedInvocator] 
    protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null) 
    { 
     var handler = PropertyChanged; 
     if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName)); 
    } 
}

綁定到BezierSegment：

private Path DefineBezierSegment(BindingPoint startPoint, BindingPoint endPoint, BindingPoint startBezierPoint, BindingPoint endBezierPoint) 
{ 
    BezierSegment spline = new BezierSegment {IsStroked = true}; 

    var b = new Binding("Point") 
    { 
     Source = startBezierPoint, 
     Mode = BindingMode.TwoWay 
    }; 
    BindingOperations.SetBinding(spline, BezierSegment.Point1Property, b); 

    b = new Binding("Point") 
    { 
     Source = endBezierPoint, 
     Mode = BindingMode.TwoWay 
    }; 
    BindingOperations.SetBinding(spline, BezierSegment.Point2Property, b); 

    b = new Binding("Point") 
    { 
     Source = endPoint, 
     Mode = BindingMode.TwoWay 
    }; 
    BindingOperations.SetBinding(spline, BezierSegment.Point3Property, b); 

    var pColl = new PathSegmentCollection {spline}; 

    var pFig = new PathFigure(StartPort.Origin.Point, pColl, false); 

    b = new Binding("Point") 
    { 
     Source = startPoint, 
     Mode = BindingMode.TwoWay 
    }; 
    BindingOperations.SetBinding(pFig, PathFigure.StartPointProperty, b); 

    var pfColl = new PathFigureCollection { pFig }; 

    return new Path() {Data = new PathGeometry(pfColl)}; 
}

來源

2015-08-18 16:47:42 vplmaster

WPF綁定到點在BezierSegment

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