DataGridView的自定义ComboBox列 [英] Custom ComboBox Column for DataGridView

问题描述

我们有一个自定义ComboBox在一个窗体上显示一些形状而不是文本。要做到这一点，我所要做的是覆盖OnDrawItem函数，它显示我们想要的。下面是一个代码片段供参考：

We have a Custom ComboBox working on a form that displays some shapes instead of text. To do that all I had to do was to override the OnDrawItem function and it displays what we want. Here is a snippet for reference:

protected override void OnDrawItem(DrawItemEventArgs e)
{
    base.OnDrawItem(e);

    e.DrawBackground();
    if (e.Index >= 0)
    {
        Brush brush = new SolidBrush(Color.LightGray);

        int size = this.Height/2;
        int origenX = e.Bounds.X + 1;
        int origenY = e.Bounds.Y + 3;
        System.Drawing.Drawing2D.GraphicsPath path =
                new System.Drawing.Drawing2D.GraphicsPath();
        switch (e.Index)
        {
            case 0:                            
                e.Graphics.FillRectangle(brush, origenX, origenY, size, size);                            
                Rectangle r = new Rectangle(origenX, origenY, size, size);                            
                ControlPaint.DrawBorder(e.Graphics, r, Color.Black,
                                        ButtonBorderStyle.Solid);
                break;
            case 1:
                path.AddEllipse(origenX, origenY, size, size);
                e.Graphics.FillPath(brush, path);
                e.Graphics.DrawPath(Pens.Black, path);
                break;
        }
    }
}

到一个表单，并添加几个项目到您的集合，所有你看到的是一个正方形和一个圆圈在下拉列表中。

So, if you add that to a form and add a couple of items to your collection all you see is a square and a circle in the drop down.

好的，现在我想做的是将同样的组合框添加到DataGridView。我知道这个控件有一个DataGridViewComboBoxColumn。我试图扩展控件，但是，我看不到这个OnDrawItem函数覆盖。我想有类似的东西吗？
任何帮助将不胜感激。
谢谢！

Ok, so, what I want to do now is add this same combo box to a DataGridView. I know that this control has a DataGridViewComboBoxColumn. I was trying to extend the control, however, I don't see this OnDrawItem function to override. I guess there exists something similar? Any help would be appreciated. Thanks!

推荐答案

您需要将DataGridViewComboBox作为自定义Combobox。

You need to interperet the DataGridViewComboBox as your custom Combobox.

private void dgTest_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
        {
            if (dgTest.CurrentCell.ColumnIndex == 0) // Which column ever is your DataGridComboBoxColumn
            {
                // This line will enable you to use the DataDridViewCOmboBox like your
                // Custom ComboBox.
                CustomComboBox combo = e.Control as CUstomComboBox;

            }
        }

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