delphi中treeview的用法
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如何用treeview实现树型结构目录，表里有fatherID字段,我是delphi新手，有人能给我详细说一下吗
我的情况是，我能把所有数据取到结果集，就是不知道怎么按fatherid在treeview里直接按树型显示出来，如果你能给个简单的例子和注释就太感谢了
//刷新Tree 1
procedure TMainForm.RefTree();
var
Tags:string ;
RootNode0,RootNode1,RootNode2,RootNode3,RootNode4,RootNode5:TtreeNode;
i:integer;
begin
TreeView1.Items.Clear;
RootNode0:=TreeView1.Items.Add(nil,'全部');
RootNode1:=TreeView1.Items.Add(nil,'资分类');
RootNode2:=TreeView1.Items.Add(nil,'部门');
RootNode3:=TreeView1.Items.Add(nil,'情况');
RootNode4:=TreeView1.Items.Add(nil,'位置');
RootNode5:=TreeView1.Items.Add(nil,'方式');
TreeView1.Items[0].ImageIndex:=11;
TreeView1.Items[1].ImageIndex:=54;
TreeView1.Items[2].ImageIndex:=54;
TreeView1.Items[3].ImageIndex:=54;
TreeView1.Items[4].ImageIndex:=54;
TreeView1.Items[5].ImageIndex:=54;
RootNode0.SelectedIndex:=RootNode0.ImageIndex;
RootNode1.SelectedIndex:=RootNode1.ImageIndex;
RootNode2.SelectedIndex:=RootNode2.ImageIndex;
RootNode3.SelectedIndex:=RootNode3.ImageIndex;
RootNode4.SelectedIndex:=RootNode4.ImageIndex;
RootNode5.SelectedIndex:=RootNode5.ImageIndex;
//分类
with DataM.q1 do
begin
SQL.Clear;
SQL.Add('Select Name1 from Navtree where tag=''分类'' ');
Open;
while not eof do
begin
TreeView1.Items.AddChild(RootNode1,FieldValues['Name1']);
next;
end;
end;
(此处省略365个字.....呵呵)
end;
例二
procedure TForm1.showtree; //showtree自定义的
var
mynode:ttreenode;
begin
with adoquery1 do
begin
close;
sql.Clear;
sql.Add('select * from aa where value = ''1''');
open;
if recordcount <> 0 then
begin
treeview1.Items.Add(treeview1.TopItem,fieldbyname('name').AsString);
end;
end;
with adoquery2 do
begin
close;
sql.Clear;
sql.Add('select * from aa where len(name) = 4');
open;
while not eof do
begin
mynode:= treeview1.Items.AddChild(treeview1.TopItem,fieldbyname('name').AsString);
with adoquery3 do
begin
close;
sql.Clear;
sql.Add('select * from aa where name like '''+ '%'+ mynode.Text+ ''' and len(name) = 6');
open;
if recordcount <> 0 then
begin
first;
begin
treeview1.Items.AddChild(mynode,fieldbyname('name').AsString);
next;
end;
end;
end;
next;
end;
end;
end
例三
一、指标树的建立
具体方法是：创建一个数据库，设计指标表t_pub_index，包含index_id、parent_id、index_name字段，其它字段根据实际业务而定，指标名称index_name将在树型控件的节点上显示，index_id字段保存节点的唯一标识号，parent_id表示当前节点的父节点号，标识号组成了一个“链表”，记录了树上节点的结构。设计一窗体Frm_sys_index，其上放置TreeView控件tv_zb、Query控件Query1及其它指标属性编辑显示控件。一个树的节点又包含文本(Text)和数据(Data)。Text为String类，用来显示指标或指标目录名称。Data则为无定形指针(Untyped Pointer)，可以指向一个与节点相联系的数据结构，该结构与数据库指标表相应域关联，如指标ID、上级节点ID。
Query控件的表达式为：
select index_id, parent_id, index_name from t_pub_index
start with index_id=0 connect by prior index_id=parent_id
其中start with 和connect by 是Oracle的SQL语句的保留字，使一条记录的parent_id列的值等于前一记录的index_id列的值，并以parent_id等于0的记录开始。
建树的基本思路是：
procedure TFrm_sys_index.createtree;
var
curValue: indexPointer; //指向与节点相联系的数据结构的指针
curNode : TTreeNode; //当前节点
curid : integer; //当前节点标识号
begin
curNode := nil;
curid := -1;
Query_index.Open;
Query_index.first;
while not Query_index.Eof do
begin
new(curValue);
With curValue^ do
将数据库指标表t_pub_index各字段值赋curValue 所指数据结构
while(curid <> curValue.parent_id) do //当前节点的标识号不等于当前记录的父节点号
begin
curNode := curNode.parent;
curid:= indexPointer(curNode.data).index_id;
end;
curNode := tv_zb.Items.AddChildObject(curNode,
curValue^.index_name,curValue); //在当前节点上添加子节点，显示节点指标名称，所带指针指向一个与指标数据相联系的数据结构
curid := indexPointer(curNode.data).index_id;
Query_index.next;
end;
Query_index.close;
end;
二、增加、删除、修改树节点
单纯在Treeview 上增加、删除、修改节点只需用它本身提供的Treeview.Items. AddChildObject、 Treeview.Selected.Delete、Treeview.Selected.EditText等方法即可，但要相应修改数据库中的数据，必须通过递归调用同一个函数（用于删除一个选项）来遍历所选节点下的所有子节点。下面以删除节点为例介绍具体实现流程：
function TFrm_sys_index.delnode(node1:TTreenode):TTreenode;
var
childnode:TTreenode;
begin
childnode:=node1.GetLastChild; //按倒序获得子项，因为删除选项时，列表会发生变化
while childnode<>nil do
childnode:=delnode(childnode); //如子项不为空，进行递归调用
index_id:=inttostr(indexpointer(node1.data).index_id);//获得该节点对应指标
在数据库删除相应指标;
result:=node1.parent.GetPrevChild(node1); //定位到该节点的上一节点
node1.delete; //删除树节点
end;
三、拖动树节点
拖动树节点基本上是通过建立目标项的新子项、向它复制源项、删除原项来移动选项。与上述删除操作相似，也是通过递归调用同一个函数（用于移动一个选项），按倒序移动所选节点下的所有子节点。下面是递归过程的代码：
procedure TFrm_sys_index.CopyNodeUnder(treeview:TTreeview;
sourcenode,targetnode:ttreenode);
var
newnode:ttreenode;
i:integer;
begin
newnode:=treeview.items.addchildfirst(targetnode,''); //建立目标项
newnode.assign(sourcenode); //复制源项属性
for i:=sourcenode.count-1 downto 0 do //递归调用，按倒序移动其所有子项
CopyNodeUnder (treeview,sourcenode.item[i],newnode);
treeview.items.delete(sourcenode); //删除源项
end;
Treeview对拖动操作提供支持，我们将组件的DragKind属性设置为dkDrag，DragMode属性设置为dmAutomatic，并为OnDragOver与OnDragDrop事件编写了处理程序。OnDragOver事件处理程序对允许移动的条件进行判断，排除需要避免的特殊情况。代码如下：
procedure TFrm_sys_index.tv_zbDragOver(Sender, Source: TObject; X,
Y: Integer; State: TDragState; var Accept: Boolean);
var
targetnode,sourcenode:TTreenode;
begin
targetnode:=tv_zb.getnodeat(x,y);
if (Source=Sender) and (targetnode<>nil) then //保证移动在TreeView上，且目标节点不为空
begin
Accept:=true;
sourcenode:=tv_zb.selected;
//以下代码防止用户将一个选项拖到其子项上（它会随着选项一起移动，导致死循环）
while (targetnode.parent<>nil) and (targetnode <> sourcenode) do
targetnode:=targetnode.parent;
if (targetnode = sourcenode) then Accept:=false;
end
else Accept:=false;
end;
OnDragDrop事件处理程序启动前述移动过程CopyNodeUnder，修改数据库数据。此外，在大批量添加数据到Treeview中时最好使用TreeView.Items.BeginUpdate和 TreeView.Items.EndUpdate，这样能加快显示速度。大致流程如下：
procedure TFrm_sys_index.tv_zbDragDrop(Sender, Source: TObject; X,
Y: Integer);
var
targetnode,sourcenode:TTreenode;
begin
targetnode:=tv_zb.getnodeat(x,y); //获得源节点
sourcenode:=tv_zb.selected; //获得目标节点
修改数据库中当前节点的父节点号parent_id，使其等目标节点标识号；
tv_zb.items.beginupdate; //禁用TreeView重绘操作
try
copynodeunder(tv_zb,sourcenode,targetnode); //启动移动过程
tv_zb.selected:=targetnode;
finally
tv_zb.items.endupdate; //重新设置
end;
end;
例四
给你一段超级短的代码，caption字段就是你的value字段，因value是保留字，所以我改成这个了。
procedure TForm1.Button1Click(Sender: TObject);
var
ss: TStrings;
begin
AdoQuery1.SQL.Text := 'SELECT name,caption FROM test8 ORDER BY name';
AdoQuery1.Open;
ss := TStringList.Create;
while not AdoQuery1.Eof do
begin
ss.Add(StringOfChar(#9,(Length(Trim(AdoQuery1.FieldValues['name'])) div 2)-1)
+ AdoQuery1.FieldValues['caption']);
AdoQuery1.Next;
end;
ShowMessage(ss.Text);
ss.SaveToFile('d:\test8.txt');
ss.Free;
TreeView1.LoadFromFile('d:\test8.txt');
end; 参考技术A 如果楼主能给个详细点的要求我能给你个例子
通常的做法就是把数据取到客户端数据集里然后根据fatherid排序，
一次加到Treeview里的
但是我不知道你的具体情况，怕举例子也不要说，楼主如果有兴趣可以hi我 参考技术B 双击你的TreeView 自己添加吧 参考技术C 常数简单示例
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
ComCtrls;
type
TForm1 = class(TForm)
tv1: TTreeView;
procedure FormCreate(Sender: TObject);
private
Private declarations
public
Public declarations
end;
var
Form1: TForm1;
implementation
$R *.DFM
procedure TForm1.FormCreate(Sender: TObject);
var
text:array[1..6] of string;
node:array[1..6] of TTreeNode;
begin
Text[1]:='根';
node[1]:= tv1.Items.Add(nil,Text[1]);
Text[2]:='二级根';
node[2]:=tv1.Items.AddChild(node[1],Text[2]);
Text[3]:='二级根';
node[3]:=tv1.Items.AddChild(node[1],Text[3]);
Text[4]:='三级根';
node[4]:=tv1.Items.AddChild(node[2],Text[4]);
Text[5]:='三级根';
node[5]:=tv1.Items.AddChild(node[2],Text[5]);
Text[6]:='三级根';
node[6]:=tv1.Items.AddChild(node[3],Text[5]);
end;
end.
C# WPF TreeView用法实例解析
概述
TreeView是常用的树状列表，在项目开发中也时常会用到，这节主要讲解treeview在wpf的基本用法！
结果演示：
代码讲解
前台xaml：
<UserControl x:Class="Caliburn.Micro.Hello.Views.TreeViewView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:Caliburn.Micro.Hello.Views"
xmlns:self="clr-namespace:Caliburn.Micro.Hello.ViewModels"
xmlns:dxg="http://schemas.devexpress.com/winfx/2008/xaml/grid"
xmlns:dx="http://schemas.devexpress.com/winfx/2008/xaml/core"
xmlns:cal="http://www.caliburnproject.org"
mc:Ignorable="d"
d:DesignHeight="450" d:DesignWidth="800">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<dxg:TreeListControl
ItemsSource="Binding EmployeeDepartments"
SelectedItem="Binding CurrentSelectedItem" Grid.Column="0" >
<dxg:TreeListControl.View>
<dxg:TreeListView
AllowColumnFiltering="False"
AllowConditionalFormattingMenu="False"
AllowFixedColumnMenu="False"
AllowRecursiveNodeChecking="True"
AutoWidth="True"
FetchSublevelChildrenOnExpand="False"
IsColumnMenuEnabled="False"
IsRowCellMenuEnabled="True"
IsTotalSummaryMenuEnabled="False"
KeyFieldName="Id"
ParentFieldName="ParentId"
ShowNodeImages="True"
ShowSearchPanelMode="Always">
</dxg:TreeListView>
</dxg:TreeListControl.View>
<dxg:TreeListColumn
AllowEditing="False"
FieldName="Employees.Name"
Header="Binding TreeTitle" />
</dxg:TreeListControl>
<TreeView
Grid.Column="1"
Margin="10,15,10,10"
ItemsSource="Binding EmployeeDepartments">
<TreeView.ItemContainerStyle>
<Style TargetType="x:Type TreeViewItem" />
</TreeView.ItemContainerStyle>
<TreeView.ItemTemplate>
<HierarchicalDataTemplate DataType="x:Type self:EmployeeDepartment" ItemsSource="Binding Employees">
<StackPanel HorizontalAlignment="Stretch" Orientation="Horizontal">
<CheckBox IsChecked="True"/>
<TextBlock
VerticalAlignment="Center"
FontSize="14"
Text="Binding Name"
TextTrimming="CharacterEllipsis" />
</StackPanel>
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
<!--最简洁写法-->
<TreeView Grid.Column="0" Grid.Row="1" ItemsSource="Binding EmployeeDepartments">
<TreeView.ItemTemplate>
<HierarchicalDataTemplate ItemsSource="Binding Employees">
<StackPanel>
<TextBlock Text="Binding Name"/>
</StackPanel>
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
<TreeView Grid.Column="1" Grid.Row="1" ItemsSource="Binding nodesCollection">
<TreeView.ItemTemplate>
<HierarchicalDataTemplate ItemsSource="Binding ChildNodes">
<StackPanel HorizontalAlignment="Stretch" Orientation="Horizontal">
<!--<dx:SimpleButton Glyph="dx:DXImage Images/Arrows/Next_16x16.png"/>-->
<CheckBox IsChecked="Binding IsChecked"
cal:Message.Attach="[Event Click]=[Action CheckBox_Click($source,$eventArgs)]" />
<TextBlock
VerticalAlignment="Center"
FontSize="14"
Text="Binding NodeName"
TextTrimming="CharacterEllipsis" />
</StackPanel>
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
</Grid>
</UserControl>后台cs代码：
using PropertyChanged;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Windows;
using System.Windows.Controls;
namespace Caliburn.Micro.Hello.ViewModels
public class TreeViewViewModel : Screen, IViewModel
public TreeViewViewModel()
DisplayName = "TreeView";
EmployeeDepartments = Departments.GetDepartments();
//方法1
//nodes = new List<TreeNode>()
//
// new TreeNode() ParentID = 0,NodeID = 1,NodeName = "Chapter1",
// new TreeNode() ParentID = 0,NodeID = 2,NodeName = "Chapter2",
// new TreeNode() ParentID = 0,NodeID = 3,NodeName = "Chapter3",
// new TreeNode() ParentID = 1,NodeID = 4,NodeName = "Section1.1",
// new TreeNode() ParentID = 1,NodeID = 5,NodeName = "Section1.2",
// new TreeNode() ParentID = 2,NodeID = 6,NodeName = "Section2.1",
// new TreeNode() ParentID = 3,NodeID = 7,NodeName = "Section3.1",
// new TreeNode() ParentID = 6,NodeID = 8,NodeName = "SubSection2.1.1",
// new TreeNode() ParentID = 6,NodeID = 9,NodeName = "SubSection2.1.2",
// new TreeNode() ParentID = 2,NodeID = 10,NodeName = "Section2.2",
// new TreeNode() ParentID = 3,NodeID = 11,NodeName = "Section3.2",
//;
//nodes = getNodes(0,nodes);
//方法2
nodesCollection = new ObservableCollection<TreeNode>()
new TreeNode()
NodeName = "中国人",
ChildNodes = new ObservableCollection<TreeNode>()
new TreeNode() NodeName = "李嘉诚",
new TreeNode()
NodeName = "王健林",
ChildNodes = new ObservableCollection<TreeNode>()
new TreeNode() NodeName = "68岁",
new TreeNode() NodeName = "一个儿子",
,
,
new TreeNode()
NodeName = "外国人",
ChildNodes = new ObservableCollection<TreeNode>()
new TreeNode()
NodeName = "马斯克",
ChildNodes = new ObservableCollection<TreeNode>()
new TreeNode() NodeName = "51岁",
new TreeNode() NodeName = "10个老婆",
,
;
public List<EmployeeDepartment> EmployeeDepartments get; set;
public List<TreeNode> nodes get; set;
public ObservableCollection<TreeNode> nodesCollection get; set;
//private List<TreeNode> getNodes(int parentID, List<TreeNode> nodes)
//
// List<TreeNode> mainNodes = nodes.Where(x => x.ParentID == parentID).ToList();
// List<TreeNode> otherNodes = nodes.Where(x => x.ParentID != parentID).ToList();
// foreach (TreeNode node in mainNodes)
// node.ChildNodes = getNodes(node.NodeID, otherNodes);
// return mainNodes;
//
public void CheckBox_Click(object sender, RoutedEventArgs e)
CheckBox checkBox;
if (sender is CheckBox)
checkBox = sender as CheckBox;
else
return;
//SetIsChecked(nodesCollection);
foreach (var childNode in nodesCollection)
//SetIsChecked(childNode, checkBox.IsChecked);
SetIsChecked(childNode);
//public void SetIsChecked(ObservableCollection<TreeNode> childNodes)
//
// foreach (var childNode in childNodes)
//
// if(!childNode.IsChecked)
//
// foreach (var child in childNode.ChildNodes)
//
// child.IsChecked = false;
// SetIsChecked(child.ChildNodes);
//
//
// else
//
// SetIsChecked(childNode.ChildNodes);
//
//
//
public void SetIsChecked(TreeNode treeNode)
foreach (var child in treeNode.ChildNodes)
if (!treeNode.IsChecked)
child.IsChecked = false;
SetIsChecked(child);
public static class Departments
public static List<EmployeeDepartment> GetDepartments()
List<EmployeeDepartment> departments = new List<EmployeeDepartment>();
departments.Add(new EmployeeDepartment("Management", new Employee[]
new Employee(0, "Gregory S. Price")
));
departments.Add(new EmployeeDepartment("Marketing", new Employee[]
new Employee(1, "Irma R. Marshall"),
new Employee(2, "Brian C. Cowling"),
new Employee(3, "Thomas C. Dawson"),
new Employee(4, "Bryan R. Henderson"),
));
departments.Add(new EmployeeDepartment("Operations", new Employee[]
new Employee(5, "John C. Powell"),
new Employee(6, "Harold S. Brandes"),
new Employee(7, "Jan K. Sisk"),
new Employee(8, "Sidney L. Holder"),
));
departments.Add(new EmployeeDepartment("Production", new Employee[]
new Employee(9, "Christian P. Laclair"),
new Employee(10, "James L. Kelsey"),
new Employee(11, "Howard M. Carpenter"),
new Employee(12, "Jennifer T. Tapia"),
));
departments.Add(new EmployeeDepartment("Finance", new Employee[]
new Employee(13, "Karen J. Kelly"),
new Employee(14, "Judith P. Underhill"),
new Employee(15, "Russell E. Belton"),
));
return departments;
public class Employee
public Employee(int id, string name)
ID = id;
Name = name;
public int ID get; set;
public string Name get; set;
public class EmployeeDepartment
public string Name get; set;
public ObservableCollection<Employee> Employees get;
public EmployeeDepartment(string name, IEnumerable<Employee> employees)
Name = name;
Employees = new ObservableCollection<Employee>(employees);
[AddINotifyPropertyChangedInterface]
public class TreeNode
//public int NodeID get; set;
//public int ParentID get; set;
public string NodeName get; set;
public bool IsChecked get; set;
public ObservableCollection<TreeNode> ChildNodes get; set;
public TreeNode()
IsChecked = true;
ChildNodes = new ObservableCollection<TreeNode>();
通过SetIsChecked方法实现了主节点取消勾选后，子节点也跟着去勾选，要勾选子节点，也先得选中主节点.
源码下载
链接：https://pan.baidu.com/s/1ty500tUFPNGtfnJorqaZ7A
提取码：6666
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