vb.net三态树形_状态机框架资源-CSDN文库

共34个文件

vb：7个

tlog：4个

cache：3个

需积分: 9 135 浏览量 2014-04-22 11:01:58 上传评论收藏 61KB RAR 举报

在VB.NET编程环境中，`TreeView`控件是一个非常常见的组件，用于展示层次化的数据结构，类似于Windows资源管理器中的文件夹结构。在这个特定的场景中，我们关注的是如何实现`TreeView`控件的三态复选框功能。三态复选框不仅仅包括通常的“已选”和“未选”两种状态，还增加了一个“灰色选中”状态，这种状态通常表示不确定或禁用选项。我们需要理解`TreeView`控件的基本操作。在VS2010中，你可以通过拖放的方式将`TreeView`控件添加到窗体上。然后，可以使用`TreeView.Nodes.Add()`方法来添加根节点，接着通过`Node.Nodes.Add()`递归添加子节点。每个节点都可以拥有一个`CheckBox`属性，用于显示复选框。对于三态复选框的实现，VB.NET本身并不直接支持。但是，我们可以自定义事件处理程序来模拟这个功能。以下是一些关键步骤： 1. **扩展TreeNode类**：创建一个新的类，继承自`System.Windows.Forms.TreeNode`，并添加一个新的属性，如`TriStateState`，来存储节点的三态状态。可能的值可以是`Checked`（已选）、`Unchecked`（未选）和`Grayed`（灰选）。 ```vbnet Public Class TriStateTreeNode Inherits TreeNode Public EnumTriStateState Checked Unchecked Grayed End Enum Public Property State As TriStateState End Class ``` 2. **设置CheckBox样式**：为了显示三态复选框，我们需要覆盖`DrawNode`事件。在这个事件处理程序中，我们可以根据`TriStateState`属性来决定绘制复选框的状态。 ```vbnet Private Sub TreeView_DrawNode(sender As Object, e As DrawTreeNodeEventArgs) Handles TreeView.DrawNode ' 根据TriStateState绘制不同状态的复选框 Dim node As TriStateTreeNode = TryCast(e.Node, TriStateTreeNode) If node IsNot Nothing Then Dim rect As Rectangle = e.Bounds Dim state As CheckState = GetCheckStateFromTriState(node.State) ControlPaint.DrawCheckBox(e.Graphics, rect, state) Else ' 对于非自定义节点，使用默认绘制 MyBase.OnDrawNode(sender, e) End If End Sub ``` 3. **处理点击事件**：当用户点击节点时，我们需要更新`TriStateState`并确保所有子节点和父节点的状态一致。这可以通过处理`AfterCheck`事件来实现。 ```vbnet Private Sub TreeView_AfterCheck(sender As Object, e As TreeViewEventArgs) Handles TreeView.AfterCheck Dim node As TriStateTreeNode = TryCast(e.Node, TriStateTreeNode) If node IsNot Nothing Then UpdateNodeAndChildrenState(node) UpdateParentState(node) End If End Sub ``` 在这两个方法中，你需要编写逻辑来根据用户的操作和当前的节点状态，更新`TriStateState`以及相关联的子节点和父节点状态。 4. **实现状态转换逻辑**：`UpdateNodeAndChildrenState`和`UpdateParentState`方法需要包含状态转换的逻辑，比如从已选到未选，从已选到灰选，从未选到灰选等。通过以上步骤，我们就能在VB.NET中实现一个具有三态复选框功能的`TreeView`控件。这个功能在权限控制、数据筛选和多级选择等场景中非常有用，能够提供更丰富的交互体验。注意，`study`这个文件名可能是源代码、示例项目或者教程文档的名称，实际的内容需要参考具体的文件才能进行深入的讲解和学习。在实际开发中，确保理解和应用这些概念，结合实际的代码示例进行练习，才能更好地掌握这一技术。

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vb.NET三态树形.rar （34个子文件）

study

TreeFrm.Designer.vb 3KB

ApplicationEvents.vb 3B

My Project

Settings.settings 279B

AssemblyInfo.vb 1KB

Settings.Designer.vb 3KB

licenses.licx 245B

Application.Designer.vb 2KB

Resources.resx 5KB

Resources.Designer.vb 3KB

Application.myapp 470B

app.manifest 2KB

app.config 1KB

TreeFrm.resx 14KB

study.vbproj 7KB

TreeFrm.vb 7KB

study.vbproj.user 748B

obj

x86

Debug

GenerateResource.read.1.tlog 5KB

study.exe 30KB

study.xml 662B

ResolveAssemblyReference.cache 41KB

TempPE

My Project.Resources.Designer.vb.dll 8KB

study.vbproj.FileListAbsolute.txt 3KB

study.pdb 40KB

ResGen.read.1.tlog 2B

WindowsApplication1.TreeFrm.resources 5KB

DesignTimeResolveAssemblyReferencesInput.cache 5KB

WindowsApplication1.Resources.resources 180B

study.exe.licenses 408B

ResGen.write.1.tlog 2B

DesignTimeResolveAssemblyReferences.cache 53KB

GenerateResource.write.1.tlog 4KB

Release

bin

Debug

Release

study.sln 857B

study.suo 32KB

三态树形--数据语句.txt 1KB

D:\练习例子\VB\study\study\bin\Debug\study.exe D:\练习例子\VB\study\study\bin\Debug\study.pdb D:\练习例子\VB\study\study\bin\Debug\study.xml D:\练习例子\VB\study\study\obj\x86\Debug\ResolveAssemblyReference.cache D:\练习例子\VB\study\study\obj\x86\Debug\WindowsApplication1.Resources.resources D:\练习例子\VB\study\study\obj\x86\Debug\study.exe D:\练习例子\VB\study\study\obj\x86\Debug\study.xml D:\练习例子\VB\study\study\obj\x86\Debug\study.pdb D:\练习例子\VB\study\study\bin\Debug\study.exe.config D:\练习例子\VB\study\study\obj\x86\Debug\GenerateResource.read.1.tlog D:\练习例子\VB\study\study\obj\x86\Debug\GenerateResource.write.1.tlog C:\study\study\bin\Debug\study.exe.config C:\study\study\bin\Debug\study.exe C:\study\study\bin\Debug\study.pdb C:\study\study\bin\Debug\study.xml C:\study\study\obj\x86\Debug\ResolveAssemblyReference.cache C:\study\study\obj\x86\Debug\WindowsApplication1.Mainfrm.resources C:\study\study\obj\x86\Debug\WindowsApplication1.Resources.resources C:\study\study\obj\x86\Debug\GenerateResource.read.1.tlog C:\study\study\obj\x86\Debug\GenerateResource.write.1.tlog C:\study\study\obj\x86\Debug\study.exe C:\study\study\obj\x86\Debug\study.xml C:\study\study\obj\x86\Debug\study.pdb D:\练习例子\study\study\bin\Debug\study.exe.config D:\练习例子\study\study\bin\Debug\study.exe D:\练习例子\study\study\bin\Debug\study.pdb D:\练习例子\study\study\bin\Debug\study.xml D:\练习例子\study\study\obj\x86\Debug\ResolveAssemblyReference.cache D:\练习例子\study\study\obj\x86\Debug\WindowsApplication1.Mainfrm.resources D:\练习例子\study\study\obj\x86\Debug\WindowsApplication1.Resources.resources D:\练习例子\study\study\obj\x86\Debug\GenerateResource.read.1.tlog D:\练习例子\study\study\obj\x86\Debug\GenerateResource.write.1.tlog D:\练习例子\study\study\obj\x86\Debug\study.exe D:\练习例子\study\study\obj\x86\Debug\study.xml D:\练习例子\study\study\obj\x86\Debug\study.pdb D:\练习例子\VB\study\study\obj\x86\Debug\WindowsApplication1.TreeFrm.resources D:\练习例子\VB\study\study\obj\x86\Debug\WindowsApplication1.DevFrm.resources D:\练习例子\VB\study\study\obj\x86\Debug\study.exe.licenses D:\练习例子\VB\study\study\obj\x86\Debug\WindowsApplication1.DevFrm2.resources D:\练习例子\VB\study\study\obj\x86\Debug\WindowsApplication1.U8LoginFrm.resources D:\练习例子\VB\study\study\bin\Debug\Interop.U8Login.dll D:\练习例子\VB\study\study\obj\x86\Debug\Interop.U8Login.dll D:\练习例子\VB\study\study\obj\x86\Debug\study.vbproj.ResolveComReference.cache D:\study\study\bin\Debug\study.exe.config D:\study\study\bin\Debug\study.exe D:\study\study\bin\Debug\study.pdb D:\study\study\bin\Debug\study.xml D:\study\study\obj\x86\Debug\ResolveAssemblyReference.cache D:\study\study\obj\x86\Debug\WindowsApplication1.TreeFrm.resources D:\study\study\obj\x86\Debug\WindowsApplication1.Resources.resources D:\study\study\obj\x86\Debug\GenerateResource.read.1.tlog D:\study\study\obj\x86\Debug\ResGen.read.1.tlog D:\study\study\obj\x86\Debug\GenerateResource.write.1.tlog D:\study\study\obj\x86\Debug\ResGen.write.1.tlog D:\study\study\obj\x86\Debug\study.exe.licenses D:\study\study\obj\x86\Debug\study.exe D:\study\study\obj\x86\Debug\study.xml D:\study\study\obj\x86\Debug\study.pdb

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