建立一个窗体,在窗体上放置如下控件:
Treeview 控件:名称 Treeview1;
Imagelist 控件:名称 Imagelist1,并在该控件中放置三张个性图片(32×32),建立索引1、2、3;(方法:在Imagelist 控件上单击鼠标右键选择属性)
Label 控件:名称分别为Lab(0)、Lab(1),Caption分别为“父节点:”、“子节点:”;
Textbox 控件:名称分别为Txt(0)、Txt(1),text都为“”;
commandbutton 控件:名称为系统默认,Caption分别为“添加”、“展开”、“收起”、“排序”、“删除”、“退出”;
将下列代码加入到代码框:
Option Explicit
Dim I As Integer Dim J As Integer Dim nodx As Node Dim CunZai As Boolean 定义变量
Private Sub Command1_Click() If Txt(0).Text <> "" And Txt(1).Text <> "" Then 不允许建立零字节的父节点和子节点 CunZai = False J = TreeView1.Nodes.Count For I = 1 To TreeView1.Nodes.Count 检查新输入的父节点名称是否存在 If TreeView1.SelectedItem.Children > 0 Then If Txt(0).Text = TreeView1.Nodes(I).Text Then CunZai = True End If Next I If CunZai = True Then 若存在, 则在父节点下建立子节点 Set nodx = TreeView1.Nodes.Add(Txt(0).Text, tvwChild, "child" & J, Txt(1).Text, 3) Else ,若不存在,则建立父节点和子节点 Set nodx = TreeView1.Nodes.Add(, , Txt(0).Text, Txt(0).Text, 1) Set nodx = TreeView1.Nodes.Add(Txt(0).Text, tvwChild, "child" & J,_ Txt(1).Text, 3) End If TreeView1.Refresh ElseIf Txt(0).Text = "" Then MsgBox "请输入父节点名称!", vbInformation, "警告!" 系统提示 ElseIf Txt(1).Text = "" Then MsgBox "请输入子节点名称!", vbInformation, "警告!" End If End Sub
Private Sub Command2_Click() For I = 1 To TreeView1.Nodes.Count TreeView1.Nodes(I).Expanded = True 展开所有节点 Next I End Sub
Private Sub Command3_Click() For I = 1 To TreeView1.Nodes.Count TreeView1.Nodes(I).Expanded = False 收起所有节点 Next I End Sub
Private Sub Command4_Click() TreeView1.Sorted = True 排列顺序 End Sub
Private Sub Command5_Click() If TreeView1.SelectedItem.Index <> 1 Then TreeView1.Nodes.Remove TreeView1.SelectedItem.Index 删除选定的节点 End If End Sub
Private Sub Command6_Click() End 退出程序 End Sub
Private Sub Form_Load() TreeView1.LineStyle =TvwTreeLines 在兄弟节点和父节点之间显示线 TreeView1.ImageList = ImageList1 链接图像列 TreeView1.Style = tvwTreelinesPlusMinusPictureText 树状外观包含全部元素 Set nodx = TreeView1.Nodes.Add(, , "蒲子明", "蒲子明", 1) 建立名称为"蒲子明"的父节点,选择索引为1的图像 Set nodx = TreeView1.Nodes.Add("蒲子明", tvwChild, "child01", "收件箱", 3) 在"蒲子明"父节点下建立"收件箱"子节点,选择索引为3的图像 Set nodx = TreeView1.Nodes.Add("蒲子明", tvwChild, "child02", "发件箱", 3) 在"蒲子明"父节点下建立"发件箱"子节点,选择索引为3的图像 CunZai = False End Sub
Private Sub TreeView1_Expand(ByVal Node As MSComctlLib.Node) Node.ExpandedImage = 2 节点被展开时,选择索引为2的图像 End Sub
Private Sub TreeView1_NodeClick(ByVal Node As MSComctlLib.Node) If TreeView1.SelectedItem.Children = 0 Then 检查是否有子节点,0为无 For I = 1 To TreeView1.Nodes.Count If TreeView1.Nodes(I).Selected Then MsgBox "您选择的是:“" & TreeView1.Nodes(I).FullPath & "”子节点!" 系统提示 End If Next I End If End Sub
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