创建时将形状信息添加到 ListView

Question

我在画布中创建形状（矩形、椭圆、线条）。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的信息（例如位置、大小、它是什么形状）。

我在另一个窗口中的 XAML 中有此代码：

    <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：我设法绑定了宽度和高度，但我不知道如何绑定它的位置和形状（矩形或椭圆）

Answer 1

在适当的 MVVM 方法中，您应该有一个带有 Shape 抽象表示（而不是 UI 元素列表）的视图模型，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。每个形状的位置和大小是从形状对象的Bounds属性中检索的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;
}