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WPF datagrid column heading span more than once column

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轮回少年
轮回少年 2020-12-30 17:14

In a WPF datagrid is it possible to group column headings?

What I\'m after is 

| Column 1 | Column 2 | Column 3|
| a  b  c  | a  b  c  | a  b  c |
|
6条回答
  • 夕颜
    夕颜 (楼主)
    2020-12-30 17:24

    This is an old post and I liked D'Hags answere. Unfortunatley it didn't satisfy my reqiurement entirely. Hence I extended D'Hags solution a bit which allows now:

    • column spans are possible in an arbitrary manner and not only the entire row
    • column span is defined by using object references. When column 2 and column 3 are databinding to the same object reference then a span is rendered
    • the column span should behave exaclty like the others columns, so that for instance selections are possible.

    The solution goes like this:

    A Datagrid with the a style:

    That sets the following class to be used instead of using DataGridCellsPanel directly:

    public class DataGridSpannedCellPanel : DataGridCellsPanel
{
    protected override Size ArrangeOverride(Size arrangeSize)
    {
        if (DataContext is IEnumerable)
        {
            base.ArrangeOverride(arrangeSize);

            IEnumerable data = ((IEnumerable)DataContext).Cast();
            double totalPreviousWidth = 0;
            double totalPos = 0;


            List columnSize = new List();
            double currentSize = 0;


            for (int i = 0; i < data.Count(); ++i)
            {
                Object el = data.ElementAt(i);
                Object nextEl = null;

                UIElement uiel = InternalChildren[i];

                if (data.Count() > i + 1)
                {
                    nextEl = data.ElementAt(i + 1);
                }


                if (Object.ReferenceEquals(el, nextEl) && el != null)
                {
                    totalPreviousWidth += uiel.RenderSize.Width;
                    uiel.Arrange(new Rect(new Point(0, 0), new Size(0, 0)));
                }
                else
                {
                    if (totalPreviousWidth > 0)
                    {
                        uiel.Arrange(new Rect(new Point(totalPos, 0),
                    new Size(totalPreviousWidth + uiel.RenderSize.Width, uiel.RenderSize.Height))

                     );
                        currentSize = totalPreviousWidth + uiel.RenderSize.Width;
                    }

                    totalPos += uiel.RenderSize.Width;

                    totalPreviousWidth = 0;
                }
            }

            return arrangeSize;
        }
        else
        {
            return base.ArrangeOverride(arrangeSize);
        }

    }
 }
}



    And it used in the following way:
    


    public partial class MainWindow : Window
{

    void AddColumn(DataGrid dg, int i)
    {

        var col = new DataGridTextColumn();
        col.Header = (char)('A' + i);
        col.Binding = new Binding("[" + i + "]");

        dg.Columns.Add(col);

    }

    public MainWindow()
    {
        InitializeComponent();

        for (int i = 0; i < 10; ++i)
        {
            AddColumn(dataGrid, i);
        }

        List rows = new List();

        String[] txtHeader = new string[7];
        String multiSpan = "MergedColumn";
        txtHeader[0] = "Col1";
        txtHeader[1] = "Col2";
        txtHeader[2] = "Col3";
        // these columns should be merged to one, which is indicated by assigning 
        // the same reference to all columns.
        txtHeader[3] = multiSpan;
        txtHeader[4] = multiSpan;
        txtHeader[5] = multiSpan;

        int[] intArr = new int[10];
        for (int i = 0; i < 10; i++)
        {
            intArr[i] = i;
        }

        rows.Add(txtHeader);
        rows.Add(intArr);

        dataGrid.ItemsSource = rows;
    }
}
}

    
    
             
    
                                                        
    
            
            
    
              
                
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