C#教程之DevExpress实现GridControl列头绘制Checkbox的方

当前位置:

首页 > c#编程 >

C#教程之DevExpress实现GridControl列头绘制Checkbox的方

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;

}

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);

}

代码运行效果如下图所示：

栏目列表