如何处理绘画的一个DataGridView的编辑控制？ [英] How do I handle painting for a DataGridView's editing control?

问题描述

我有一个的DataGridView 和我画的TreeView风格的虚线每排在其 RowPostPaint 事件。当第一小区（其是 DataGridViewTextBoxCell ）是在编辑模式，该行不绘制。如何处理绘画的编辑控制？该标准的编辑控件没有一个Paint事件，我不希望创建一个新的类型的细胞，如果我能避免这样做。

I have a DataGridView and I'm drawing TreeView-style dotted lines on the first cell of each row during its RowPostPaint event. When the first cell (which is a DataGridViewTextBoxCell) is in editing mode, the lines aren't drawn. How do I handle painting for the editing control? The standard editing control doesn't have a Paint event, and I don't want to create a new type of cell if I can avoid doing so.

推荐答案

我觉得这就是答案：

左一集的第一列的单元格边距为16，所以在查看模式或编辑模式，内容会通过给定的填充显示。

First set cell padding of your first column to 16 from left, so in view mode or edit mode, content will be shown using given padding.

this.dataGridView1.Columns[0].DefaultCellStyle.Padding= new Padding(16,0,0,0);

然后处理细胞绘画活动，做以下步骤：

Then handle Cell Painting event and do these steps:

1. 只画第一列rowIndex位置应为> = 0，以避免渲染列标题
2. 在画你的树纹或任何你想
3. 在使用e.Handled = TRUE
取消默认的画

下面是code：

private void dataGridView1_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
{
    //Only paint rirst column and RowIndex should be >=0 to avoid rendering column header
    if (e.ColumnIndex == 0 & e.RowIndex >= 0)
    {
        //Paint your tree lines or whatever you want
        using (var treePen = new Pen(Color.Gray, 1))
        {
            treePen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dot;
            e.Paint(e.CellBounds, DataGridViewPaintParts.All);
            e.Graphics.DrawLine(treePen,
                new Point(e.CellBounds.Left + 4, e.CellBounds.Top),
                new Point(e.CellBounds.Left + 4, e.CellBounds.Bottom));

            e.Graphics.DrawLine(treePen,
                new Point(e.CellBounds.Left + 4, e.CellBounds.Top + e.CellBounds.Height / 2),
                new Point(e.CellBounds.Left + 12, e.CellBounds.Top + e.CellBounds.Height / 2));
        }

        //Cancel default painting using e.Handled = true
        e.Handled = true;
    }
}

和这里是截图：

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