DevExpress之TreeList复选框实现
概述：本文主要讲述DevExpress TreeList复选框实现，希望对大家有帮助。
一、TreeList的GetStateImage事件应用
方法一：此事件用于在tree之前设置显示的图片，具体使用方法是首先在窗体上放置imagelist,设置好图片，即可在事件中判断后，选择要显示的图片的索引值即可。
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private void treeList_GetStateImage(object sender, DevExpress.XtraTreeList.GetStateImageEventArgs e) { CheckState check = GetCheckState(e.Node.Tag); if(check == CheckState.Unchecked) e.NodeImageIndex = 0; else if(check == CheckState.Checked) e.NodeImageIndex = 1; else e.NodeImageIndex = 2; } |
方法二：为tree中指定的节点区分现实不同的图片
示例代码如下：
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private void roleTree_GetStateImage(object sender, DevExpress.XtraTreeList.GetStateImageEventArgs e) { if(e.Node.Id.ToString() == "0") { this.roleTree.Nodes[0].RootNode.StateImageIndex = 1; } else { e.NodeImageIndex = 0; } } |
二、TreeList中运用MouseDown事件获取所选节点信息
提取tree中的值所用事件为MouseDown，在事件中填写如下代码：
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private void roleTree_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e){if(e.Button == MouseButtons.Left){DevExpress.XtraTreeList.TreeListHitInfo hInfo = roleTree.GetHitInfo(new Point(e.X, e.Y));if(hInfo.HitInfoType == DevExpress.XtraTreeList.HitInfoType.StateImage){// this.roleTree.DeleteNode(hInfo.Node);if(MessageBox.Show("你确定要删除"+hInfo.Node[1].ToString()+"角色","提示信 息",MessageBoxButtons.YesNo,MessageBoxIcon.Question)==DialogResult.Yes){TB_Accounts_RolesEntity role = new TB_Accounts_RolesEntity();role.iRoleID = Convert.ToInt32(hInfo.Node[1].ToString());role.Retrieve();role.Delete();InitRoleTree();}else{}}else if(hInfo.HitInfoType == DevExpress.XtraTreeList.HitInfoType.Cell){// MessageBox.Show(hInfo.Node[1].ToString()); //获取选择的iRoleID// SetCheckedNode(treeList.Nodes[0].Nodes[0]);//得到指定iRoleID的全部的vDescript的允许的Tablestring roleID = hInfo.Node[1].ToString();string sqlString="SELECT dbo.TB_Accounts_Permissions.vDescript FROM dbo.TB_Accounts_Permissions INNER JOIN dbo.TB_Accounts_RolePermissions ON dbo.TB_Accounts_Permissions.iPermissionID = dbo.TB_Accounts_RolePermissions.iPermissionID WHERE 1=1"; //编写SQL语句sqlString +=" and dbo.TB_Accounts_RolePermissions.iRoleID = '"+roleID+"'";//执行SQL语句DataTable dt=Query.ProcessSql(sqlString,"EasySales");for(int i = 0; i<dt.Rows.Count; i++){string treeText = treeList.GetNodeByVisibleIndex(i).GetDisplayText(0).ToString();if(treeText == dt.Rows[i]["vDescript"].ToString()){SetCheckedNode(treeList.Nodes[0].Nodes[i]);}}/**/////// //判断treeList的行数和DataTable的行数是否一致////// if(this.treeList.VisibleNodesCount.ToString()==dt.Rows.Count.ToString())////// {//////////// //循环treeList的全部的vDescript的值////// for(int i = 0; i<Convert.ToInt32(this.treeList.VisibleNodesCount.ToString());i++)////// {////// //判断treeList的vDescript的值和Table的vDescipte的值是否相等////// if(this.treeList.GetNodeByVisibleIndex(i).GetDisplayText(0).ToString() != dt.Rows[i]["vDescript"].ToString())////// {////// MessageBox.Show("得到不同的vDescript");//////// Checked();////// }////// else////// {////// MessageBox.Show("得到相同的vDescript");//////// UnChecked();////// }////// }////// }////// else////// {////// MessageBox.Show("长度不一致");////// }}}} |
三、TreeList前添加CheckBox的选择框，可实现点击父节点相应子节点全部选中的效果
TreeList中并为提供对应实现此功能的CheckBox自定义列，故必须用上面提到的GetStateImage事件添加三个（全选、部分全选、为选中）CheckBox的图片，具体样式可自己设计，然后放到窗体中的ImageList中去，触发及调用用到下面的代码：
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private CheckState GetCheckState(object obj){if(obj != null) return (CheckState)obj;return CheckState.Unchecked;}private void SetCheckedNode(string treeText){CheckState check = new CheckState();check = CheckState.Checked;}private void SetCheckedNode(DevExpress.XtraTreeList.Nodes.TreeListNode node){CheckState check = GetCheckState(node.Tag);if(check == CheckState.Indeterminate || check == CheckState.Unchecked) check = CheckState.Checked;else check = CheckState.Unchecked;treeList.BeginUpdate();node.Tag = check;SetCheckedChildNodes(node, check);SetCheckedParentNodes(node, check);treeList.EndUpdate();}private void SetCheckedChildNodes(DevExpress.XtraTreeList.Nodes.TreeListNode node, CheckState check){for(int i = 0; i < node.Nodes.Count; i++){node.Nodes[i].Tag = check;SetCheckedChildNodes(node.Nodes[i], check);}}private void SetCheckedParentNodes(DevExpress.XtraTreeList.Nodes.TreeListNode node, CheckState check){if(node.ParentNode != null){bool b = false;for(int i = 0; i < node.ParentNode.Nodes.Count; i++){if(!check.Equals(node.ParentNode.Nodes[i].Tag)){b = !b;break;}}node.ParentNode.Tag = b ? CheckState.Indeterminate : check;SetCheckedParentNodes(node.ParentNode, check);}}private void treeList_GetStateImage(object sender, DevExpress.XtraTreeList.GetStateImageEventArgs e){CheckState check = GetCheckState(e.Node.Tag);if(check == CheckState.Unchecked)e.NodeImageIndex = 0;else if(check == CheckState.Checked)e.NodeImageIndex = 1;else e.NodeImageIndex = 2;}private void treeList_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e){if(e.KeyData == Keys.Space)SetCheckedNode(treeList.FocusedNode);}private void treeList_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e){if(e.Button == MouseButtons.Left){DevExpress.XtraTreeList.TreeListHitInfo hInfo = treeList.GetHitInfo(new Point(e.X, e.Y));if(hInfo.HitInfoType == DevExpress.XtraTreeList.HitInfoType.StateImage)SetCheckedNode(hInfo.Node);}}private void roleTree_GetStateImage(object sender, DevExpress.XtraTreeList.GetStateImageEventArgs e){if(e.Node.Id.ToString() == "0"){this.roleTree.Nodes[0].RootNode.StateImageIndex = 1;}else{e.NodeImageIndex = 0;}} |
这样就可实现上述功能。
四、Grid中设置、获取指定Cell的值，用下面的方法：
获取：GridView.GetRowCellValue()
设置：GridView.SetRowCellValue()
