Question

我有一个包含大量单元格的网格，其中一些是空的。我想确定MouseDown事件发生时哪个单元格是鼠标。这怎么可能？

Answer 1

将一个按钮放入空单元格（或所有单元格中的按钮，但当其他项目存在时隐藏样式并使单元格不为空）。然后，当用户单击该单元格时，报告单元格，如

private void OnButtonClick(object sender, RoutedEventArgs e)
{
    var buttonClicked = sender as Button;

    var gridRow = (int)buttonClicked.GetValue( MyGrid.RowProperty );
    var gridColumn = (int)buttonClicked.GetValue( MyGrid.ColumnProperty );

}

Answer 2

首先要记住的是，具有透明背景的控件不会为其透明区域生成事件。为所需的网格设置颜色，或将其绑定到网格所在窗口的背景颜色，否则事件不会触发。

此代码示例演示了一种用于在给定MouseMove事件的情况下确定网格元素位置的计算方法。 ButtonClick事件参数非常相似。此示例中的相关方法是ColumnComputation和RowComputation，它们采用控件和列或行定义的位置进行线性分析。该示例在InnerGrid UI元素上运行。

表格类：

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }



    private void InnerGrid_PreviewMouseMove(object sender, MouseEventArgs e)
    {
        this.XCoordinate.Text = e.GetPosition(InnerGrid).X.ToString();
        this.YCoordinate.Text = e.GetPosition(InnerGrid).Y.ToString();
        this.ColumnPosition.Text = ColumnComputation(InnerGrid.ColumnDefinitions, e.GetPosition(InnerGrid).X).ToString();
        this.RowPosition.Text = RowComputation(InnerGrid.RowDefinitions, e.GetPosition(InnerGrid).Y).ToString();

    }

    private double ColumnComputation(ColumnDefinitionCollection c, double YPosition)
    {
        var columnLeft = 0.0; var columnCount = 0;
        foreach (ColumnDefinition cd in c)
        {
            double actWidth = cd.ActualWidth;
            if (YPosition >= columnLeft && YPosition < (actWidth + columnLeft)) return columnCount;
            columnCount++;
            columnLeft += cd.ActualWidth;
        }
        return (c.Count + 1);
    }
    private double RowComputation(RowDefinitionCollection r, double XPosition)
    {
        var rowTop = 0.0; var rowCount = 0;
        foreach (RowDefinition rd in r)
        {
            double actHeight = rd.ActualHeight;
            if (XPosition >= rowTop && XPosition < (actHeight + rowTop)) return rowCount;
            rowCount++;
            rowTop += rd.ActualHeight;
        }
        return (r.Count + 1);
    }
}

XAML表格：

<Window x:Name="window" x:Class="GridHitTest.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid Name="OuterBorder"  >
        <Grid.ColumnDefinitions>
            <ColumnDefinition/>
            <ColumnDefinition/>
            <ColumnDefinition/>
            <ColumnDefinition/>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="20"/>
            <RowDefinition Height="20"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
        <TextBlock Grid.Column="0" HorizontalAlignment="Center" >X Coordinate</TextBlock>
        <TextBlock Grid.Column="1" HorizontalAlignment="Center"  >Y Coordinate</TextBlock>
        <TextBlock Grid.Column="2" HorizontalAlignment="Center" >Column</TextBlock>
        <TextBlock Grid.Column="3" HorizontalAlignment="Center"  >Row</TextBlock>
        <TextBlock Grid.Row="1" Grid.Column="0" HorizontalAlignment="Center" Name="XCoordinate">kjahsd</TextBlock>
        <TextBlock Grid.Row="1"  Grid.Column="1" HorizontalAlignment="Center" Name="YCoordinate">___ahsdjf</TextBlock>
        <TextBlock Grid.Row="1"  Grid.Column="2" HorizontalAlignment="Center"  Name="ColumnPosition">___ahsdjf</TextBlock>
        <TextBlock Grid.Row="1" Grid.Column="3" HorizontalAlignment="Center"  Name="RowPosition">___ahsdjf</TextBlock>
        <Grid Name="InnerGrid" Margin="20,45,20,10" Grid.ColumnSpan="4" Grid.RowSpan="3" Background="{Binding Background, ElementName=window}"  PreviewMouseMove="InnerGrid_PreviewMouseMove"  >
            <Grid.RowDefinitions>
                <RowDefinition/>
                <RowDefinition/>
                <RowDefinition/>
            </Grid.RowDefinitions>
            <Grid.ColumnDefinitions>
                <ColumnDefinition/>
                <ColumnDefinition/>
                <ColumnDefinition/>
            </Grid.ColumnDefinitions>
        </Grid>
    </Grid>
</Window>

Answer 3

这是另一种选择，似乎比建议的正确答案简单得多。

private void Grid_MouseDown(object sender, MouseButtonEventArgs e)
{
    var element = (UIElement)e.Source;
    int row = Grid.GetRow(element);
    int column = Grid.GetColumn(element);
}

按坐标在网格中单击了哪个单元格？

3 个答案: