创建列表视图时将形状信息添加到列表视图
我在画布上创建形状(矩形,椭圆形,直线)。然后我在另一个窗口中有一个列表视图,我需要在其中输入形状信息(例如位置,大小,它是什么形状)。
我在另一个窗口的XAML中有以下代码:
<ListView Name="Information"> <ListView.View>
<GridView>
<GridViewColumn Header="Type"/>
<GridViewColumn Header="PositionX"/>
<GridViewColumn Header="PositionY"/>
<GridViewColumn Header="Width" DisplayMemberBinding="{Binding ActualWidth}"/>
<GridViewColumn Header="Height" DisplayMemberBinding="{Binding ActualHeight}"/>
</GridView>
</ListView.View>
</ListView>
在主窗口的C#中,我有一个可观察的集合和以下代码:
ObservableCollection<Shape> shapes = new ObservableCollection<Shape>();myRect.Width = var1;
myRect.Height = var2;
Page.Children.Add(myRect);
Canvas.SetLeft(myRect, posx);
Canvas.SetTop(myRect, posy);
shapes.Add(myRect);
2ndwindow.Information.ItemsSource = shapes; // this is working because the 2ndwindow is owned by the mainwindow
编辑:我设法绑定宽度和高度,但我不知道如何绑定位置和它的形状(矩形或椭圆形)
回答:
在适当的MVVM方法中,您应该具有一个带有Shape的抽象表示的视图模型(而不是UI元素列表),例如:
public class ShapeData{
public string Type { get; set; }
public Geometry Geometry { get; set; }
public Brush Fill { get; set; }
public Brush Stroke { get; set; }
public double StrokeThickness { get; set; }
}
public class ViewModel
{
public ObservableCollection<ShapeData> Shapes { get; }
= new ObservableCollection<ShapeData>();
}
您现在可以将此视图模型绑定到如下所示的视图。从形状对象的Bounds
属性中检索每个形状的位置和大小Geometry
。
<Grid> <Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<ItemsControl ItemsSource="{Binding Shapes}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<Canvas/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<Path Data="{Binding Geometry}"
Fill="{Binding Fill}"
Stroke="{Binding Stroke}"
StrokeThickness="{Binding StrokeThickness}"/>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
<ListView Grid.Column="1" ItemsSource="{Binding Shapes}">
<ListView.View>
<GridView>
<GridViewColumn Header="Type"
DisplayMemberBinding="{Binding Type}"/>
<GridViewColumn Header="X"
DisplayMemberBinding="{Binding Geometry.Bounds.X}"/>
<GridViewColumn Header="Y"
DisplayMemberBinding="{Binding Geometry.Bounds.Y}"/>
<GridViewColumn Header="Width"
DisplayMemberBinding="{Binding Geometry.Bounds.Width}"/>
<GridViewColumn Header="Height"
DisplayMemberBinding="{Binding Geometry.Bounds.Height}"/>
</GridView>
</ListView.View>
</ListView>
</Grid>
您可以在窗口的构造函数中创建一个视图模型实例,并添加一些示例数据,如下所示:
public MainWindow(){
InitializeComponent();
var viewModel = new ViewModel();
viewModel.Shapes.Add(new ShapeData
{
Type = "Circle",
Geometry = new EllipseGeometry(new Point(100, 100), 50, 50),
Fill = Brushes.Orange,
Stroke = Brushes.Navy,
StrokeThickness = 2
});
viewModel.Shapes.Add(new ShapeData
{
Type = "Rectangle",
Geometry = new RectangleGeometry(new Rect(200, 50, 50, 100)),
Fill = Brushes.Yellow,
Stroke = Brushes.DarkGreen,
StrokeThickness = 2
});
DataContext = viewModel;
}
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