在创建

时间:2016-10-22 08:29:37

标签: c# wpf

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listview,我需要输入形状的信息(如位置,大小,形状)。

我在另一个窗口的XAML中有这段代码:

    <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这段代码:

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形状(矩形或椭圆)

1 个答案:

答案 0 :(得分:2)

在适当的MVVM方法中,你应该有一个带有Shape的抽象表示的视图模型(而不是UI元素列表),例如:像这样:

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的{​​{1}}属性中检索每个形状的位置和大小。

Geometry

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:

<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>