protected override void OnRowPostPaint(DataGridViewRowPostPaintEventArgs e)
{
base.OnRowPostPaint(e);
Rectangle cellRectangle = new Rectangle
(e.RowBounds.Location.X, e.RowBounds.Location.Y, this.RowHeadersWidth, this.Rows[e.RowIndex].Height);
using (SolidBrush brush = new SolidBrush(SystemColors.ControlLight))
{
e.Graphics.FillRectangle(brush, cellRectangle);
}
ICollapseRow row = this.Rows[e.RowIndex] as ICollapseRow;
if (row == null)
{
return;
}
if (row.SubRows != null && row.SubRows.Count != 0)
{
Rectangle rect = new Rectangle(e.RowBounds.Location.X + 4, e.RowBounds.Location.Y + 5, 9, 9);
Image img = null;
if (row.IsCollapse)
{
img = IconsLibrary.Plus;
}
else
{
img = IconsLibrary.Minus;
}
e.Graphics.DrawImage(img, rect);
}
}
/// <summary>
/// 不要直接调用
/// 通过设置 IsCollapse 属性来获得相应的功能
/// </summary>
private void HideSubRow()
{
if (this.SubRows == null || this.SubRows.Count == 0)
{
return;
}
this.DataGridView.SuspendLayout();
for (int i = 0; i < this.SubRows.Count; i++)
{
if (this.SubRows[i].DataGridView == this.DataGridView)
{
//首先处理可能的子行和子行的子行]
ICollapseRow collapseRow = this.SubRows[i] as ICollapseRow;
if (collapseRow != null)
{
collapseRow.IsCollapse = true;
}
this.DataGridView.Rows.Remove(this.SubRows[i]);
}
}
this.DataGridView.ResumeLayout();
}
protected override void OnCellMouseDoubleClick(DataGridViewCellMouseEventArgs e)
{
base.OnCellMouseDoubleClick(e);
ICollapseRow row = this.Rows[e.RowIndex] as ICollapseRow;
if (row != null)
{
row.IsCollapse = !row.IsCollapse;
}
}