6

WPF 中的网格目前有一个这样的网格系统：

    Cols
   +   +   +   +   +
   | 0 | 1 | 2 | 3 | 
+--+---|---|---|---|---
 0 |   |   |   |   |
+--+---|---|---|---|---  Rows
 1 |   |   |   |   |   
+--+---|---|---|---|---
 2 |   |   |   |   | 
+--+---|---|---|---|---

有没有办法让它表现得像这样：

    Cols
   +   +   +   +   +
   | 0 | 1 | 2 | 3 | 
+--+---|---|---|---|---
 2 |   |   |   |   |
+--+---|---|---|---|---  Rows
 1 |   |   |   |   |   
+--+---|---|---|---|---
 0 |   |   |   |   | 
+--+---|---|---|---|---

理想情况下，我希望 RowSpan 向上而不是向下扩展项目。

例子：

我的数据源在地图上将一个立方体存储为 0,0，以便将其显示在左下角。然而，WPF 中的网格会将该立方体放在左上角。另一个问题是数据源给了我一个 2x2 的位置，左下角的“锚点”位置的宽度和高度。宽度和高度绑定到 ColSpan 和 RowSpan。RowSpan 是一个问题，因为它将向下扩展而不是向上扩展。

4

5 回答 5

1

您可以通过编写自己的自定义控件来实现这一点。您可以继承自Grid，或者使用UserControl带有 a 的 a Grid。无论哪种方式，您都将提供类似于 a 的附加属性Grid，然后您可以根据需要操作这些值，然后将它们传递给底层Grid.

于 2012-04-05T22:01:24.017 回答
1

Grid你展示立方体的地方是固定大小的吗？如果是这样，您可以考虑编写一个 ViewModel 来转换/反转模型坐标以便在视图中工作，即立方体将具有该值(0,0)，而 ViewModel 将该值公开为(0,2).

只是一个可能比滚动自己的控制更容易的想法。

于 2012-04-05T23:48:14.993 回答
1

您应该能够做到这一点，而无需使用附加属性创建自定义或用户控件。

这是一个我认为应该能够做你想做的事的课程。Grid.Row不要将and的值绑定Grid.RowSpan到您的行和高度，而是绑定GridEx.RowFromBottom到GridEx.RowSpanFromBottom它们。这些属性的属性更改处理程序将Grid.Row根据这些属性的值和网格中的行数计算新值。

一个潜在的问题是，如果您在运行时从网格中添加或减去行，这可能无法正确更新。

public static class GridEx
{
    public static readonly DependencyProperty RowFromBottomProperty = DependencyProperty.RegisterAttached("RowFromBottom", typeof(int?), typeof(GridEx), new FrameworkPropertyMetadata(default(int?), FrameworkPropertyMetadataOptions.AffectsMeasure | FrameworkPropertyMetadataOptions.AffectsArrange | FrameworkPropertyMetadataOptions.AffectsParentArrange | FrameworkPropertyMetadataOptions.AffectsParentMeasure, OnRowFromBottomChanged));
    public static readonly DependencyProperty RowSpanFromBottomProperty = DependencyProperty.RegisterAttached("RowSpanFromBottom", typeof(int?), typeof(GridEx), new FrameworkPropertyMetadata(default(int?), FrameworkPropertyMetadataOptions.AffectsMeasure | FrameworkPropertyMetadataOptions.AffectsArrange | FrameworkPropertyMetadataOptions.AffectsParentArrange | FrameworkPropertyMetadataOptions.AffectsParentMeasure, OnRowSpanFromBottomChanged));

    private static void OnRowFromBottomChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var grid = GetContainingGrid(d);
        int? rowFromBottom = (int?) e.NewValue;
        int? rowSpanFromBottom = GetRowSpanFromBottom(d);
        if (rowFromBottom == null || rowSpanFromBottom == null) return;
        int rows = grid.RowDefinitions.Count;
        int row = Math.Max(0, Math.Min(rows, rows - rowFromBottom.Value - rowSpanFromBottom.Value));
        Grid.SetRow((UIElement) d, row);
    }

    private static void OnRowSpanFromBottomChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var grid = GetContainingGrid(d);
        int? rowFromBottom = GetRowFromBottom(d);
        int? rowSpanFromBottom = (int?)e.NewValue;
        if (rowFromBottom == null || rowSpanFromBottom == null) return;
        int rows = grid.RowDefinitions.Count;
        int row = Math.Max(0, Math.Min(rows, rows - rowFromBottom.Value - rowSpanFromBottom.Value));
        Grid.SetRow((UIElement)d, row);
        Grid.SetRowSpan((UIElement)d, rowSpanFromBottom.Value);
    }

    public static int? GetRowFromBottom(DependencyObject obj)
    {
        return (int?) obj.GetValue(RowFromBottomProperty);
    }

    public static void SetRowFromBottom(DependencyObject obj, int? value)
    {
        obj.SetValue(RowFromBottomProperty, value);
    }

    public static int? GetRowSpanFromBottom(DependencyObject obj)
    {
        return (int?)obj.GetValue(RowSpanFromBottomProperty);
    }

    public static void SetRowSpanFromBottom(DependencyObject obj, int? value)
    {
        obj.SetValue(RowSpanFromBottomProperty, value);
    }

    private static Grid GetContainingGrid(DependencyObject element)
    {
        Grid grid = null;
        while (grid == null && element != null)
        {
            element = LogicalTreeHelper.GetParent(element);
            grid = element as Grid;
        }
        return grid;
    }
}

如果您对这里发生的事情有任何疑问，请随时提问。

于 2012-04-26T03:58:20.910 回答
1

试试这个转换器。XAML 看起来有点复杂，但不需要 ViewModel(s) 或 UserControl(s)：

转换器翻转行：

public class UpsideDownRowConverter : IMultiValueConverter
{
    public int RowCount
    {
        get;
        set;
    }

    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
        if (values.Length == 2 && values[0] is int && values[1] is int)
        {
            var row = (int)values[0];
            var rowSpan = (int)values[1];

            row = this.RowCount - row - rowSpan;

            return row;
        }

        return DependencyProperty.UnsetValue;
    }

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

XAML。第一个 Grid 是原始的，第二个是翻转的：

<Window.Resources>
    <local:UpsideDownRowConverter x:Key="UpsideDownRowConverter"
                                    RowCount="3"/>
</Window.Resources>
<UniformGrid Rows="2">
    <Grid Name="Original"
            Margin="0,0,0,10">
        <Grid.ColumnDefinitions>
            <ColumnDefinition/>
            <ColumnDefinition/>
            <ColumnDefinition/>
            <ColumnDefinition/>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition/>
            <RowDefinition/>
            <RowDefinition/>
        </Grid.RowDefinitions>
        <Rectangle Fill="Green"
                    Grid.Column="0"
                    Grid.Row="2"/>
        <Rectangle Fill="Red"
                    Grid.Column="1"
                    Grid.Row="1"/>
        <Rectangle Fill="Blue"
                    Grid.Column="2"
                    Grid.RowSpan="3"/>
        <Rectangle Fill="Yellow"
                    Grid.Column="3"
                    Grid.RowSpan="2"/>
    </Grid>
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition/>
            <ColumnDefinition/>
            <ColumnDefinition/>
            <ColumnDefinition/>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition/>
            <RowDefinition/>
            <RowDefinition/>
        </Grid.RowDefinitions>
        <Rectangle Fill="Green"
                    Grid.Column="0">
            <Grid.Row>
                <MultiBinding Converter="{StaticResource UpsideDownRowConverter}">
                    <Binding Path="Children[0].(Grid.Row)"
                                ElementName="Original"/>
                    <Binding Path="(Grid.RowSpan)"
                                RelativeSource="{RelativeSource Self}"/>
                </MultiBinding>
            </Grid.Row>
        </Rectangle>
        <Rectangle Fill="Red"
                    Grid.Column="1">
            <Grid.Row>
                <MultiBinding Converter="{StaticResource UpsideDownRowConverter}">
                    <Binding Path="Children[1].(Grid.Row)"
                                ElementName="Original"/>
                    <Binding Path="(Grid.RowSpan)"
                                RelativeSource="{RelativeSource Self}"/>
                </MultiBinding>
            </Grid.Row>
        </Rectangle>
        <Rectangle Fill="Blue"
                    Grid.Column="2"
                    Grid.RowSpan="3">
            <Grid.Row>
                <MultiBinding Converter="{StaticResource UpsideDownRowConverter}">
                    <Binding Path="Children[2].(Grid.Row)"
                                ElementName="Original"/>
                    <Binding Path="(Grid.RowSpan)"
                                RelativeSource="{RelativeSource Self}"/>
                </MultiBinding>
            </Grid.Row>
        </Rectangle>
        <Rectangle Fill="Yellow"
                    Grid.Column="3"
                    Grid.RowSpan="2">
            <Grid.Row>
                <MultiBinding Converter="{StaticResource UpsideDownRowConverter}">
                    <Binding Path="Children[3].(Grid.Row)"
                                ElementName="Original"/>
                    <Binding Path="(Grid.RowSpan)"
                                RelativeSource="{RelativeSource Self}"/>
                </MultiBinding>
            </Grid.Row>
        </Rectangle>
    </Grid>
</UniformGrid>

不幸的是，它无法将行数作为第三个值传递，因为 RowDefinitionCollection 不会通知更改。这就是为什么我将 RowCount 添加为转换器的属性。

于 2012-04-26T11:13:53.787 回答
0

您可以将行转换为反向格式，如下所示：

    private void ReverseRow(Grid grd)
    {
        int totalRows = grd.RowDefinitions.Count-1;
        foreach (UIElement ctl in grd.Children)
        {
            int currentRowIndex = Grid.GetRow(ctl);
            Grid.SetRow(ctl, totalRows - currentRowIndex);
        }
    }

这将还原该行。

于 2012-05-01T06:05:41.567 回答