我有以下XAML代码:
<Grid>
<ItemsControl ItemsSource="{Binding Items}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<Canvas></Canvas>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<Grid>
<Ellipse Width="{Binding Radius}" Height="{Binding Radius}" Fill="{Binding BackColor}" />
<Line Stroke="Black" StrokeThickness="1" x:Name="_Line"/>
</Grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
<ItemsControl.ItemContainerStyle>
<Style>
<Setter Property="Canvas.Left" Value="{Binding X}"/>
<Setter Property="Canvas.Top" Value="{Binding Y}"/>
<Setter Property="Line.X1" Value="{Binding LineX1}"/>
<Setter Property="Line.X2" Value="{Binding LineX2}"/>
<Setter Property="Line.Y1" Value="{Binding LineY1}"/>
<Setter Property="Line.Y2" Value="{Binding LineY2}"/>
</Style>
</ItemsControl.ItemContainerStyle>
</ItemsControl>
</Grid>
这是一个ItemsControl,其ItemPanel是一个Canvas,用于动态地将椭圆从我绑定的Obervable Collection中放置。使用Canvas.Top和Canvas.Left值的椭圆的放置工作正常。但它没有绘制连接椭圆的线条。
在后面的代码中正确计算了行的位置,我检查了它。
答案 0 :(得分:1)
不应将“线”属性应用于“项容器”。相反,它们应该直接在DataTemplate中的Line控件上设置:
<ItemsControl.ItemTemplate>
<DataTemplate>
<Grid>
<Ellipse Width="{Binding Radius}" Height="{Binding Radius}"
Fill="{Binding BackColor}" />
<Line Stroke="Black" StrokeThickness="1" x:Name="_Line"
X1="{Binding LineX1}" Y1="{Binding LineY1}"
X2="{Binding LineX2}" Y1="{Binding LineY2}"/>
</Grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
请注意,LineX和LineY属性值是相对于项目位置的。
编辑:绝对放置所有元素的替代解决方案不是在项容器上设置Canvas.Left和Canvas.Top属性(即根本没有ItemContainerStyle)。
您将使用带有EllipseGeometry而不是Ellipse的Path,并将EllipseGeometry的Center属性绑定到类型Point
的视图模型属性,以替换X和Y:
<ItemsControl ItemsSource="{Binding Items}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<Canvas/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<Canvas>
<Path Fill="{Binding Fill}" Panel.ZIndex="1">
<Path.Data>
<EllipseGeometry Center="{Binding Center}"
RadiusX="{Binding Radius}"
RadiusY="{Binding Radius}"/>
</Path.Data>
</Path>
<Line Stroke="Black"
X1="{Binding LineX1}" Y1="{Binding LineY1}"
X2="{Binding LineX2}" Y2="{Binding LineY2}"/>
</Canvas>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>