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本文实例展示了DevExpress实现GridControl列头绘制Checkbox的方法，具体实现方法如下：
主要功能代码如下：
/// <summary>
/// 为列头绘制CheckBox
/// </summary>
/// <param name="view">GridView</param>
/// <param name="checkItem">RepositoryItemCheckEdit</param>
/// <param name="fieldName">需要绘制Checkbox的列名</param>
/// <param name="e">ColumnHeaderCustomDrawEventArgs</param>
public static void DrawHeaderCheckBox(this GridView view, RepositoryItemCheckEdit checkItem, string fieldName, ColumnHeaderCustomDrawEventArgs e)
{
/*说明：
*参考：https://www.devexpress.com/Support/Center/Question/Details/Q354489
*在CustomDrawColumnHeader中使用
*eg：
* private void gvCabChDetail_CustomDrawColumnHeader(object sender, DevExpress.XtraGrid.Views.Grid.ColumnHeaderCustomDrawEventArgs e)
* {
* GridView _view = sender as GridView;
* _view.DrawHeaderCheckBox(CheckItem, "Check", e);
* }
*/
if (e.Column != null && e.Column.FieldName.Equals(fieldName))
{
e.Info.InnerElements.Clear();
e.Painter.DrawObject(e.Info);
DrawCheckBox(checkItem, e.Graphics, e.Bounds, getCheckedCount(view, fieldName) == view.DataRowCount);
e.Handled = true;
}
}
private static void DrawCheckBox(RepositoryItemCheckEdit checkItem, Graphics g, Rectangle r, bool Checked)
{
CheckEditViewInfo _info;
CheckEditPainter _painter;
ControlGraphicsInfoArgs _args;
_info = checkItem.CreateViewInfo() as CheckEditViewInfo;
_painter = checkItem.CreatePainter() as CheckEditPainter;
_info.EditValue = Checked;
_info.Bounds = r;
_info.PaintAppearance.ForeColor = Color.Black;
_info.CalcViewInfo(g);
_args = new ControlGraphicsInfoArgs(_info, new DevExpress.Utils.Drawing.GraphicsCache(g), r);
_painter.Draw(_args);
_args.Cache.Dispose();
}
private static int getCheckedCount(GridView view, string filedName)
{
int count = 0;
for (int i = 0; i < view.DataRowCount; i++)
{
object _cellValue = view.GetRowCellValue(i, view.Columns[filedName]);
if (_cellValue == null) continue;
if (string.IsNullOrEmpty(_cellValue.ToString().Trim())) continue;
bool _checkStatus = false;
if (bool.TryParse(_cellValue.ToString(), out _checkStatus))
{
if (_checkStatus)
count++;
}
}
return count;
}
</div>
代码使用方法如下：
RepositoryItemCheckEdit CheckItem = new RepositoryItemCheckEdit();
const string gcCheckFieldName = "Checked";
private void gvLampConfig_CustomDrawColumnHeader(object sender, ColumnHeaderCustomDrawEventArgs e)
{
GridView _view = sender as GridView;
_view.DrawHeaderCheckBox(CheckItem, gcCheckFieldName, e);
}
</div>
代码运行效果如下图所示：
