在开发一个个人项目的时候,有客户反映默认GridView多选操作不是很方便和理想,想在列表的左边增加一列可以勾选,并且最好支持列表头部全选的操作,否则数据多的时候一个个勾选要到天荒地老。
基于以上需求,找了不少例子进行比较,并对代码进行测试改进,终于完成了以上的功能了, 并且由于我本身做了多套界面的处理,因此,基于传统的DataGridView全选操作不能少,而且基于DevExpress控件的GridView全选操作也应该支持,呵呵。
无图无真相,下面先上图介绍两种不同的效果,然后在详细介绍代码的实现。
1)DevExpress控件的GridView的实现多选操作
先讲DevExpress控件的GridView的实现,要实现的功能基本上是处理单击全选操作、重新绘制表头等操作,首先在加载第一步实现相关的事件和操作,如下所示。
this.gridView1.Click +=
new System.EventHandler(
this.gridView1_Click);
this.gridView1.CustomDrawColumnHeader +=
new DevExpress.XtraGrid.Views.Grid.ColumnHeaderCustomDrawEventHandler(
this.gridView1_CustomDrawColumnHeader);
this.gridView1.DataSourceChanged +=
new EventHandler(gridView1_DataSourceChanged);
然后就是实现里面的事件操作了,对应的代码如下所示。
private void gridView1_Click(
object sender, EventArgs e)
{
if (DevControlHelper.ClickGridCheckBox(
this.gridView1,
" Check ", m_checkStatus))
{
m_checkStatus = !m_checkStatus;
}
}
private void gridView1_CustomDrawColumnHeader(
object sender, DevExpress.XtraGrid.Views.Grid.ColumnHeaderCustomDrawEventArgs e)
{
if (e.Column !=
null && e.Column.FieldName ==
" Check ")
{
e.Info.InnerElements.Clear();
e.Painter.DrawObject(e.Info);
DevControlHelper.DrawCheckBox(e, m_checkStatus);
e.Handled =
true;
}
}
void gridView1_DataSourceChanged(
object sender, EventArgs e)
{
GridColumn column =
this.gridView1.Columns.ColumnByFieldName(
" Check ");
if (column !=
null)
{
column.Width =
80;
column.OptionsColumn.ShowCaption =
false;
column.ColumnEdit =
new RepositoryItemCheckEdit();
}
}
其中单击和绘制表头的操作,交给另外一个类DevControlHelper来独立进行处理,数据源变化gridView1_DataSourceChanged实现的操作是寻找对应的全选列,并设置列宽、隐藏表头标题,并设置为复选框样式。
DevControlHelper 类的实现代码如下所示:
public static void DrawCheckBox(DevExpress.XtraGrid.Views.Grid.ColumnHeaderCustomDrawEventArgs e,
bool chk)
{
RepositoryItemCheckEdit repositoryCheck = e.Column.ColumnEdit
as RepositoryItemCheckEdit;
if (repositoryCheck !=
null)
{
Graphics g = e.Graphics;
Rectangle r = e.Bounds;
DevExpress.XtraEditors.ViewInfo.CheckEditViewInfo info;
DevExpress.XtraEditors.Drawing.CheckEditPainter painter;
DevExpress.XtraEditors.Drawing.ControlGraphicsInfoArgs args;
info = repositoryCheck.CreateViewInfo()
as DevExpress.XtraEditors.ViewInfo.CheckEditViewInfo;
painter = repositoryCheck.CreatePainter()
as DevExpress.XtraEditors.Drawing.CheckEditPainter;
info.EditValue = chk;
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();
}
}
public static bool ClickGridCheckBox(DevExpress.XtraGrid.Views.Grid.GridView gridView,
string fieldName,
bool currentStatus)
{
bool result =
false;
if (gridView !=
null)
{
gridView.ClearSorting();
// 禁止排序 gridView.PostEditor();
DevExpress.XtraGrid.Views.Grid.ViewInfo.GridHitInfo info;
Point pt = gridView.GridControl.PointToClient(Control.MousePosition);
info = gridView.CalcHitInfo(pt);
if (info.InColumn && info.Column !=
null && info.Column.FieldName == fieldName)
{
for (
int i =
0; i < gridView.RowCount; i++)
{
gridView.SetRowCellValue(i, fieldName, !currentStatus);
}
return true;
}
}
return result;
}
2)传统DataGridView实现全选操作
首先在第一列增加一个CheckBox控件,然后通过相关的事件,调整其位置,并相应对应的单击全选操作,初始化代码如下所示。
CheckBox HeaderCheckBox =
null;
public FrmNormalGridViewSelect()
{
InitializeComponent();
if (!
this.DesignMode)
{
HeaderCheckBox =
new CheckBox();
HeaderCheckBox.Size =
new Size(
15,
15);
this.dgvSelectAll.Controls.Add(HeaderCheckBox);
HeaderCheckBox.KeyUp +=
new KeyEventHandler(HeaderCheckBox_KeyUp);
HeaderCheckBox.MouseClick +=
new MouseEventHandler(HeaderCheckBox_MouseClick);
dgvSelectAll.CurrentCellDirtyStateChanged +=
new EventHandler(dgvSelectAll_CurrentCellDirtyStateChanged);
dgvSelectAll.CellPainting +=
new DataGridViewCellPaintingEventHandler(dgvSelectAll_CellPainting);
}
}
事件实现了CheckBox重绘调整,并处理单击事件,如下所示。
private void HeaderCheckBox_MouseClick(
object sender, MouseEventArgs e)
{
HeaderCheckBoxClick((CheckBox)sender);
}
private void dgvSelectAll_CellPainting(
object sender, DataGridViewCellPaintingEventArgs e)
{
if (e.RowIndex == -
1 && e.ColumnIndex ==
0)
ResetHeaderCheckBoxLocation(e.ColumnIndex, e.RowIndex);
}
private void ResetHeaderCheckBoxLocation(
int ColumnIndex,
int RowIndex)
{
Rectangle oRectangle =
this.dgvSelectAll.GetCellDisplayRectangle(ColumnIndex, RowIndex,
true);
Point oPoint =
new Point();
oPoint.X = oRectangle.Location.X + (oRectangle.Width - HeaderCheckBox.Width) /
2 +
1;
oPoint.Y = oRectangle.Location.Y + (oRectangle.Height - HeaderCheckBox.Height) /
2 +
1;
HeaderCheckBox.Location = oPoint;
}
private void HeaderCheckBoxClick(CheckBox HCheckBox)
{
foreach (DataGridViewRow Row
in dgvSelectAll.Rows)
{
((DataGridViewCheckBoxCell)Row.Cells[
" chkBxSelect "]).Value = HCheckBox.Checked;
}
dgvSelectAll.RefreshEdit();
}
非常感谢你阅读及支持,如果有好的建议及问题,可以联系我,共同讨论促进。