C# gridview 列头画表格

http://www.csframework.com/archive/2/arc-2-20110713-1691.htm

给DevExpress GridView的选择列Header添加CheckBox实现对所有数据行的全选功能

看图:






显示选择行的资料:






/// <summary>
/// C# GridView列头添加CheckBox控件实现全选功能
/// by C/S框架网 www.csframework.com
/// </summary>
public class GridCheckMarksSelection
{
   protected GridView _GridView;
   protected ArrayList _Selection;
   private GridColumn _CheckColumn; //自动创建的Column
   private RepositoryItemCheckEdit _CheckEdit;
   
   public GridCheckMarksSelection()
   {
      _Selection = new ArrayList();
   }
   
   public GridCheckMarksSelection(GridView view)
   : this()
   {
      this.View = view;
   }
   
   protected virtual void Attach(GridView view)
   {
      if (view == null)
      {
         return;
      }
      _Selection.Clear();
      this._GridView = view;
      _CheckEdit = (RepositoryItemCheckEdit)view.GridControl.RepositoryItems.Add("CheckEdit");
      //
      _CheckEdit.EditValueChanged += Edit_EditValueChanged;
      
      _CheckColumn = view.Columns.Add();
      _CheckColumn.OptionsColumn.AllowSort = DevExpress.Utils.DefaultBoolean.False;
      _CheckColumn.VisibleIndex = int.MaxValue;
      _CheckColumn.FieldName = "CheckMarkSelection";
      _CheckColumn.Caption = "Mark";
      _CheckColumn.OptionsColumn.ShowCaption = false;
      _CheckColumn.UnboundType = DevExpress.Data.UnboundColumnType.Boolean;
      _CheckColumn.ColumnEdit = _CheckEdit;
      
      
      view.Click += View_Click;
      view.CustomDrawColumnHeader += View_CustomDrawColumnHeader;
      view.CustomDrawGroupRow += View_CustomDrawGroupRow;
      view.CustomUnboundColumnData += view_CustomUnboundColumnData;
      view.RowStyle += view_RowStyle;
   }
   
   protected virtual void Detach()
   {
      if (View == null)
      {
         return;
      }
      if ((_CheckColumn != null))
      {
         _CheckColumn.Dispose();
      }
      if ((_CheckEdit != null))
      {
         View.GridControl.RepositoryItems.Remove(_CheckEdit);
         _CheckEdit.Dispose();
      }
      _GridView.Click -= View_Click;
      _GridView.CustomDrawColumnHeader -= View_CustomDrawColumnHeader;
      _GridView.CustomDrawGroupRow -= View_CustomDrawGroupRow;
      _GridView.CustomUnboundColumnData -= (view_CustomUnboundColumnData);
      _GridView.RowStyle -= view_RowStyle;
      
      View = null;
   }
   
   protected void DrawCheckBox(Graphics g, Rectangle r, bool Checked, bool Grayed)
   {
      DevExpress.XtraEditors.ViewInfo.CheckEditViewInfo info = default(DevExpress.XtraEditors.ViewInfo.CheckEditViewInfo);
      DevExpress.XtraEditors.Drawing.CheckEditPainter painter = default(DevExpress.XtraEditors.Drawing.CheckEditPainter);
      DevExpress.XtraEditors.Drawing.ControlGraphicsInfoArgs args = default(DevExpress.XtraEditors.Drawing.ControlGraphicsInfoArgs);
      info = (DevExpress.XtraEditors.ViewInfo.CheckEditViewInfo)_CheckEdit.CreateViewInfo();
      painter = (DevExpress.XtraEditors.Drawing.CheckEditPainter)_CheckEdit.CreatePainter();
      if (Grayed)
      {
         info.EditValue = _CheckEdit.ValueGrayed;
      }
      else
      {
         info.EditValue = Checked;
      }
      info.Bounds = r;
      info.CalcViewInfo(g);
      args = new DevExpress.XtraEditors.Drawing.ControlGraphicsInfoArgs(info, new DevExpress.Utils.Drawing.GraphicsCache(g), r);
      painter.Draw(args);
      args.Cache.Dispose();
   }
   
   private void View_Click(object sender, EventArgs e)
   {
      GridHitInfo info = default(GridHitInfo);
      Point pt = View.GridControl.PointToClient(Control.MousePosition);
      info = View.CalcHitInfo(pt);
      if (info.InColumn & object.ReferenceEquals(info.Column, _CheckColumn))
      {
         if (SelectedCount == View.DataRowCount)
         {
            ClearSelection();
         }
         else
         {
            SelectAll();
         }
      }
      if (info.InRow & View.IsGroupRow(info.RowHandle) & info.HitTest != GridHitTest.RowGroupButton)
      {
         bool selected = IsGroupRowSelected(info.RowHandle);
         SelectGroup(info.RowHandle, !selected);
      }
   }
   
   private void View_CustomDrawColumnHeader(object sender, ColumnHeaderCustomDrawEventArgs e)
   {
      if (object.ReferenceEquals(e.Column, _CheckColumn))
      {
         e.Info.InnerElements.Clear();
         e.Painter.DrawObject(e.Info);
         bool gray = SelectedCount > 0 & SelectedCount < View.DataRowCount;
         DrawCheckBox(e.Graphics, e.Bounds, SelectedCount == View.DataRowCount, gray);
         e.Handled = true;
      }
   }
   
   private void View_CustomDrawGroupRow(object sender, RowObjectCustomDrawEventArgs e)
   {
      DevExpress.XtraGrid.Views.Grid.ViewInfo.GridGroupRowInfo info = default(DevExpress.XtraGrid.Views.Grid.ViewInfo.GridGroupRowInfo);
      info = (DevExpress.XtraGrid.Views.Grid.ViewInfo.GridGroupRowInfo)e.Info;
      
      info.GroupText = " " + info.GroupText.TrimStart();
      e.Info.Paint.FillRectangle(e.Graphics, e.Appearance.GetBackBrush(e.Cache), e.Bounds);
      e.Painter.DrawObject(e.Info);
      
      Rectangle r = info.ButtonBounds;
      r.Offset(r.Width * 2, 0);
      
      int g = GroupRowSelectionStatus(e.RowHandle);
      DrawCheckBox(e.Graphics, r, g > 0, g < 0);
      e.Handled = true;
   }
   
   private void view_RowStyle(object sender, RowStyleEventArgs e)
   {
      if (IsRowSelected(e.RowHandle))
      {
         e.Appearance.BackColor = SystemColors.Highlight;
         e.Appearance.ForeColor = SystemColors.HighlightText;
      }
   }
   
   public GridView View
   {
      get { return _GridView; }
      set
      {
         if ((!object.ReferenceEquals(_GridView, value)))
         {
            Detach();
            Attach(value);
         }
      }
   }
   
   public GridColumn CheckMarkColumn
   {
      get { return _CheckColumn; }
   }
   
   public int SelectedCount
   {
      get { return _Selection.Count; }
   }
   
   public object GetSelectedRow(int index)
   {
      return this._Selection[index];
   }
   
   public int GetSelectedIndex(object row)
   {
      return _Selection.IndexOf(row);
   }
   
   public void ClearSelection()
   {
      _Selection.Clear();
      Invalidate();
   }
   
   private void Invalidate()
   {
      View.BeginUpdate();
      View.EndUpdate();
   }
   
   public void SelectAll()
   {
      _Selection.Clear();
      if (View.DataSource is ICollection)
      {
         // fast
         _Selection.AddRange((ICollection)View.DataSource);
      }
      else
      {
         int i = 0;
         for (i = 0; i <= View.DataRowCount - 1; i++)
         {
            // slow
            _Selection.Add(View.GetRow(i));
         }
      }
      Invalidate();
   }
   
   public void SelectGroup(int rowHandle, bool @select)
   {
      if (IsGroupRowSelected(rowHandle) & @select)
      {
         return;
      }
      int i = 0;
      for (i = 0; i <= (View.GetChildRowCount(rowHandle)) - 1; i++)
      {
         int childRowHandle = View.GetChildRowHandle(rowHandle, i);
         if (View.IsGroupRow(childRowHandle))
         {
            SelectGroup(childRowHandle, @select);
         }
         else
         {
            SelectRow(childRowHandle, @select, false);
         }
      }
      Invalidate();
   }
   
   public void SelectRow(int rowHandle, bool @select)
   {
      SelectRow(rowHandle, @select, true);
   }
   
   private void SelectRow(int rowHandle, bool @select, bool invalidate)
   {
      if (IsRowSelected(rowHandle) == @select)
      {
         return;
      }
      object row = View.GetRow(rowHandle);
      if (@select)
      {
         _Selection.Add(row);
      }
      else
      {
         _Selection.Remove(row);
      }
      if (invalidate)
      {
         this.Invalidate();
      }
   }
   
   public int GroupRowSelectionStatus(int rowHandle)
   {
      int count = 0;
      int i = 0;
      for (i = 0; i <= (View.GetChildRowCount(rowHandle)) - 1; i++)
      {
         int row = View.GetChildRowHandle(rowHandle, i);
         if (View.IsGroupRow(row))
         {
            int g = GroupRowSelectionStatus(row);
            if (g < 0)
            {
               return g;
            }
            if (g > 0)
            {
               count += 1;
            }
         }
         else
         {
            if (IsRowSelected(row))
            {
               count += 1;
            }
         }
      }
      if (count == 0)
      {
         return 0;
      }
      if (count == View.GetChildRowCount(rowHandle))
      {
         return 1;
      }
      return -1;
   }
   
   public bool IsGroupRowSelected(int rowHandle)
   {
      int i = 0;
      for (i = 0; i <= (View.GetChildRowCount(rowHandle)) - 1; i++)
      {
         int row = View.GetChildRowHandle(rowHandle, i);
         if (View.IsGroupRow(row))
         {
            if (!IsGroupRowSelected(row))
            {
               return false;
            }
         }
         else
         {
            if (!IsRowSelected(row))
            {
               return false;
            }
         }
      }
      return true;
   }
   
   public bool IsRowSelected(int rowHandle)
   {
      if (View.IsGroupRow(rowHandle))
      {
         return IsGroupRowSelected(rowHandle);
      }
      
      object row = View.GetRow(rowHandle);
      return GetSelectedIndex(row) != -1;
   }
   
   private void view_CustomUnboundColumnData(object sender, CustomColumnDataEventArgs e)
   {
      if (object.ReferenceEquals(e.Column, CheckMarkColumn))
      {
         if (e.IsGetData)
         {
            e.Value = IsRowSelected(e.RowHandle);
         }
         else
         {
            SelectRow(e.RowHandle, (bool)e.Value);
         }
      }
   }
   
   private void Edit_EditValueChanged(object sender, EventArgs e)
   {
      View.PostEditor();
   }
}