DBgrid 第一列加入CheckBox，点击列头 全选/全消

真对sqlserver数据说明（其他数据库没有试过）：

在数据库对应的表中加入  bit 列验证是否被选中

然后dbgrid第一列的filedname是bit列

在DBgrid的onDrawColumnCell事件中写：

procedure DBGrid1DrawColumnCell(Sender: TObject;
  const Rect: TRect; DataCol: Integer; Column: TColumn;
  State: TGridDrawState);
const  CtrlState: array[Boolean] of Integer = (DFCS_BUTTONCHECK, DFCS_BUTTONCHECK or DFCS_CHECKED);
begin
        if column.Field.DataType=ftboolean   then
                begin
                        DBGrid1.Canvas.FillRect(rect);
                        drawframecontrol(DBGrid1.Canvas.Handle,rect,dfc_button,ctrlstate[column.Field.asboolean]);
                end;
end;

上方事件写完后会在第一行第一列出现复选框

 

 在dbgrid的oncellclick事件中写，目的就是实现单击时  复选框被选中

procedure TcgDaohuodj.DBGrid1CellClick(Column: TColumn);
begin
        if DBGrid1.SelectedField.DataType=ftboolean   then
                begin
                        DBGrid1.SelectedField.DataSet.Edit;
                        DBGrid1.SelectedField.AsBoolean:=not DBGrid3.SelectedField.AsBoolean;
                        DBGrid1.SelectedField.DataSet.Post;
                end;
end；

在dbgrid的ontitileclick事件中写如下代码，目的是点击bit列是实现全选和全消

procedure DBGrid1TitleClick(Column: TColumn);
var i:integer;
begin
       if column.Index=0 then begin    //验证是否第一列
        adoquery1.First;                //游标回滚
        DBGrid1.SelectedRows.CurrentRowSelected:=true;    //第一行被选中

        if trim(column.Title.Caption)='全选' then
                begin
                        for i:=0 to dbgrid1.DataSource.DataSet.RecordCount-1 do
                                begin
                                        dbgrid1.Fields[0].DataSet.edit;
                                        dbgrid1.Fields[0].AsBoolean:=true;
                                        dbgrid1.Fields[0].DataSet.post;
                                        dbgrid1.datasource.dataset.next;
                                end;
                        column.Title.Caption:='全消';
                end
        else
                begin
                        for i:=0 to dbgrid1.DataSource.DataSet.RecordCount-1 do
                                begin
                                        dbgrid1.Fields[0].DataSet.edit;
                                        dbgrid1.Fields[0].AsBoolean:=false;
                                        dbgrid1.Fields[0].DataSet.post;
                                        dbgrid1.datasource.dataset.next;
                                end;
                        column.Title.Caption:='全选';
                end;
       adoquery1.First;    //游标回滚
        DBGrid1.SelectedRows.CurrentRowSelected:=true;  //选中第一行
        end;
end;

 

效果如图

转自：http://blog.csdn.net/yuebao353981348/article/details/6703722