treeview的问题，解决后200分相送，决不食言！

[solidpanther]

我想实现如下功能 ：
1，用鼠标点treeview里的某个结点，不放鼠标，移动鼠标后，鼠标所到之处都被选中（或者变蓝），
2，当我用ctrl键时，用鼠标能点选某些不连续的结点
有别的控件也可以，不一定是treeview，大家帮帮忙，谢谢！

[solidpanther]

顶

[bthl]

DDDD！

[wokagoka]

关注……

[yeke888]

。。。路过

[tmeteor]

按你的要求做了一个简单的，关于ctrl键的你自已扩展一下，应该不难.

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;

namespace DataManagement
{
/// <summary>
/// Form1 的摘要说明。
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.TreeView treeView1;
private ArrayList selectedNodesArr=new ArrayList ();
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;

public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();

//
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
}

/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if(components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}

#region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.treeView1 = new System.Windows.Forms.TreeView();
this.SuspendLayout();
//
// treeView1
//
this.treeView1.ImageIndex = -1;
this.treeView1.Location = new System.Drawing.Point(80, 48);
this.treeView1.Name = "treeView1";
this.treeView1.Nodes.AddRange(new System.Windows.Forms.TreeNode[] {
new System.Windows.Forms.TreeNode("所有项")});
this.treeView1.SelectedImageIndex = -1;
this.treeView1.Size = new System.Drawing.Size(168, 97);
this.treeView1.TabIndex = 0;
this.treeView1.MouseEnter += new System.EventHandler(this.treeView1_MouseEnter);
this.treeView1.AfterSelect += new System.Windows.Forms.TreeViewEventHandler(this.treeView1_AfterSelect);
this.treeView1.MouseLeave += new System.EventHandler(this.treeView1_MouseLeave);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(292, 273);
this.Controls.Add(this.treeView1);
this.Name = "Form1";
this.Text = "Form1";
this.Load += new System.EventHandler(this.Form1_Load);
this.ResumeLayout(false);

}
#endregion


[STAThread]
static void Main()
{
Application.Run(new Form1());
}

private void Form1_Load(object sender, System.EventArgs e)
{
for(int i=0;i<10;i++)
{

this.treeView1 .Nodes [0].Nodes .Add (new TreeNode ("SubNode"+i.ToString ()));
}


}

private void treeView1_MouseEnter(object sender, System.EventArgs e)
{
selectedNodesArr.Clear ();
}

private void treeView1_AfterSelect(object sender, System.Windows.Forms.TreeViewEventArgs e)
{
selectedNodesArr.Add (e.Node.Index);
}

private void treeView1_MouseLeave(object sender, System.EventArgs e)
{
foreach(object item in selectedNodesArr)
{
treeView1.Nodes [0].Nodes [Convert.ToInt32(item)].BackColor =Color.Blue;
}
}
}
}

[huangyan168168]

学习

[sutalon]

帮你顶

实在不会做

[zhangzhiwei]

up!!

[solidpanther]

不错，呵呵，不过鼠标拉动的时候并没显示已经选择什么，不是很完善，期待，
先另给royluok(roy lu)
100分可以不？

[solidpanther]

http://community.csdn.net/Expert/TopicView.asp?id=3824448

[solidpanther]

我先回去试一下啊，您再看看是否能做完善一点？

[jialuo]

如果你说的第一个问题是鼠标拖动的效果
我或许可以给你解决这两个问题

[royluok]

按你的要求做了一个测试,已经通过.
给分吧.
Public Class FrmTest
Inherits System.Windows.Forms.Form

#Region " Windows 窗体设计器生成的代码 "

Public Sub New()
MyBase.New()

'该调用是 Windows 窗体设计器所必需的。
InitializeComponent()

'在 InitializeComponent() 调用之后添加任何初始化

End Sub

'窗体重写 dispose 以清理组件列表。
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing Then
If Not (components Is Nothing) Then
components.Dispose()
End If
End If
MyBase.Dispose(disposing)
End Sub

'Windows 窗体设计器所必需的
Private components As System.ComponentModel.IContainer

'注意: 以下过程是 Windows 窗体设计器所必需的
'可以使用 Windows 窗体设计器修改此过程。
'不要使用代码编辑器修改它。
Friend WithEvents TreeView1 As System.Windows.Forms.TreeView
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.TreeView1 = New System.Windows.Forms.TreeView
Me.SuspendLayout()
'
'TreeView1
'
Me.TreeView1.BackColor = System.Drawing.SystemColors.Window
Me.TreeView1.ImageIndex = -1
Me.TreeView1.Location = New System.Drawing.Point(8, 8)
Me.TreeView1.Name = "TreeView1"
Me.TreeView1.SelectedImageIndex = -1
Me.TreeView1.Size = New System.Drawing.Size(384, 320)
Me.TreeView1.TabIndex = 0
'
'FrmTest
'
Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
Me.ClientSize = New System.Drawing.Size(400, 334)
Me.Controls.Add(Me.TreeView1)
Me.Name = "FrmTest"
Me.Text = "FrmTest"
Me.ResumeLayout(False)

End Sub

#End Region

Private Sub FrmTest_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim node As New TreeNode("all")

Dim i As Int16
For i = 0 To 10
node.Nodes.Add(i.ToString)
Next
Me.TreeView1.Nodes.Add(node)
End Sub

Dim beginPoint, endPoint As Point
Dim SelectNodeIndex As New ArrayList
Dim mouse_Down As Boolean = False
Dim mouse_Drag As Boolean = False
Dim IsFristSelect As Boolean = True

Private Sub TreeView1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles TreeView1.MouseDown
beginPoint = Me.TreeView1.PointToClient(Me.MousePosition)
mouse_Down = True
ClearSelectNode()
End Sub

Private Sub TreeView1_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles TreeView1.MouseMove
If mouse_Down Then
mouse_Drag = True
End If
End Sub

Private Sub TreeView1_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles TreeView1.MouseUp
If mouse_Down And mouse_Drag Then
endPoint = Me.TreeView1.PointToClient(Me.MousePosition)
SelectNode(GetRect(beginPoint, endPoint))
End If
mouse_Drag = False
mouse_Down = False
End Sub

Private Function GetRect(ByVal BeginP As Point, ByVal EndP As Point) As Drawing.Rectangle
'根据鼠标按下时所在的位置和释放时的位置计算出矩形
Dim f As New Drawing.Rectangle
f.Width = Math.Abs(EndP.X - BeginP.X)
f.Height = Math.Abs(EndP.Y - BeginP.Y)
If BeginP.X < EndP.X Then
f.X = BeginP.X
Else
f.X = EndP.X
End If
If BeginP.Y < EndP.Y Then
f.Y = BeginP.Y
Else
f.Y = EndP.Y
End If
Return f
End Function

Private Sub SelectNode(ByVal Rect As Rectangle)
IsFristSelect = True
Dim node As TreeNode
For Each node In Me.TreeView1.Nodes
SelectNode(Rect, node)
Next
End Sub

Private Sub SelectNode(ByVal Rect As Rectangle, ByVal node As TreeNode)
Dim nd As TreeNode
For Each nd In node.Nodes
If nd.IsVisible Then
If nd.Bounds.IntersectsWith(Rect) Then '检查此节点是否在鼠标拖出的矩形之内
Me.SelectNodeIndex.Add(nd.Index)
If IsFristSelect Then
Me.TreeView1.SelectedNode = nd
IsFristSelect = False
Else
nd.BackColor = System.Drawing.SystemColors.Highlight
End If
Else
nd.BackColor = System.Drawing.SystemColors.Window
End If
SelectNode(Rect, nd)
End If
Next
End Sub

Private Sub ClearSelectNode()
Dim node As TreeNode
For Each node In Me.TreeView1.Nodes
ClearSelectNode(node)
Next
End Sub

Private Sub ClearSelectNode(ByVal Node As TreeNode)
Dim nd As TreeNode
For Each nd In Node.Nodes
If nd.IsVisible Then
nd.BackColor = Color.FromName("Window")
End If
Next
End Sub
End Class

[royluok]

改了一下,应该满足你的两大要求,看看合不合适吧.

Public Class FrmTest
Inherits System.Windows.Forms.Form

#Region " Windows 窗体设计器生成的代码 "

Public Sub New()
MyBase.New()

'该调用是 Windows 窗体设计器所必需的。
InitializeComponent()

'在 InitializeComponent() 调用之后添加任何初始化

End Sub

'窗体重写 dispose 以清理组件列表。
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing Then
If Not (components Is Nothing) Then
components.Dispose()
End If
End If
MyBase.Dispose(disposing)
End Sub

'Windows 窗体设计器所必需的
Private components As System.ComponentModel.IContainer

'注意: 以下过程是 Windows 窗体设计器所必需的
'可以使用 Windows 窗体设计器修改此过程。
'不要使用代码编辑器修改它。
Friend WithEvents TreeView1 As System.Windows.Forms.TreeView
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.TreeView1 = New System.Windows.Forms.TreeView
Me.SuspendLayout()
'
'TreeView1
'
Me.TreeView1.BackColor = System.Drawing.SystemColors.Window
Me.TreeView1.ImageIndex = -1
Me.TreeView1.Location = New System.Drawing.Point(8, 8)
Me.TreeView1.Name = "TreeView1"
Me.TreeView1.SelectedImageIndex = -1
Me.TreeView1.Size = New System.Drawing.Size(384, 320)
Me.TreeView1.TabIndex = 0
'
'FrmTest
'
Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
Me.ClientSize = New System.Drawing.Size(400, 334)
Me.Controls.Add(Me.TreeView1)
Me.KeyPreview = True
Me.Name = "FrmTest"
Me.Text = "FrmTest"
Me.ResumeLayout(False)

End Sub

#End Region

Private Sub FrmTest_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim node As New TreeNode("all")
Dim i As Int16
For i = 0 To 10
node.Nodes.Add(i.ToString)
Next
Me.TreeView1.Nodes.Add(node)
End Sub

Dim beginPoint, endPoint As Point
Dim SelectNodeIndex As New ArrayList
Dim mouse_Down As Boolean = False
Dim mouse_Drag As Boolean = False
Dim IsFristSelect As Boolean = True
Dim CtrlKeyDown As Boolean = False
Dim NodeTemp As TreeNode

Private Sub TreeView1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles TreeView1.MouseDown
beginPoint = Me.TreeView1.PointToClient(Me.MousePosition)
mouse_Down = True
ClearSelectNode()
If CtrlKeyDown Then
NodeTemp = Me.TreeView1.SelectedNode
End If
End Sub

Private Sub TreeView1_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles TreeView1.MouseMove
If mouse_Down Then
mouse_Drag = True
End If
End Sub

Private Sub TreeView1_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles TreeView1.MouseUp
If mouse_Drag Then
endPoint = Me.TreeView1.PointToClient(Me.MousePosition)
SelectNode(GetRect(beginPoint, endPoint))
ElseIf CtrlKeyDown Then
NodeTemp.BackColor = System.Drawing.SystemColors.Highlight
Dim nd As TreeNode = Me.TreeView1.GetNodeAt(Me.TreeView1.PointToClient(Me.MousePosition))
If Not nd Is Nothing Then
nd.BackColor = System.Drawing.SystemColors.Highlight
End If
End If
mouse_Drag = False
mouse_Down = False
End Sub

Private Function GetRect(ByVal BeginP As Point, ByVal EndP As Point) As Drawing.Rectangle
'根据鼠标按下时所在的位置和释放时的位置计算出矩形
Dim f As New Drawing.Rectangle
f.Width = Math.Abs(EndP.X - BeginP.X)
f.Height = Math.Abs(EndP.Y - BeginP.Y)
If BeginP.X < EndP.X Then
f.X = BeginP.X
Else
f.X = EndP.X
End If
If BeginP.Y < EndP.Y Then
f.Y = BeginP.Y
Else
f.Y = EndP.Y
End If
Return f
End Function

Private Sub SelectNode(ByVal Rect As Rectangle)
IsFristSelect = True
Dim node As TreeNode
For Each node In Me.TreeView1.Nodes
SelectNode(Rect, node)
Next
End Sub

Private Sub SelectNode(ByVal p As Point)

End Sub
Private Sub SelectNode(ByVal Rect As Rectangle, ByVal node As TreeNode)
Dim nd As TreeNode
For Each nd In node.Nodes
If nd.IsVisible Then
If nd.Bounds.IntersectsWith(Rect) Then '检查此节点是否在鼠标拖出的矩形之内
If IsFristSelect Then
Me.TreeView1.SelectedNode = nd
IsFristSelect = False
Else
nd.BackColor = System.Drawing.SystemColors.Highlight
End If
Else
nd.BackColor = System.Drawing.SystemColors.Window
End If
SelectNode(Rect, nd)
End If
Next
End Sub

Private Sub ClearSelectNode()
If CtrlKeyDown = False Then
Dim node As TreeNode
For Each node In Me.TreeView1.Nodes
ClearSelectNode(node)
Next
End If
End Sub

Private Sub ClearSelectNode(ByVal Node As TreeNode)
Dim nd As TreeNode
For Each nd In Node.Nodes
If nd.IsVisible And nd.IsSelected = False Then
nd.BackColor = Color.FromName("Window")
End If
Next
End Sub

Private Sub FrmTest_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles MyBase.KeyDown
If e.KeyCode = Keys.ControlKey Then
CtrlKeyDown = True
End If
End Sub

Private Sub FrmTest_KeyUp(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles MyBase.KeyUp
If e.KeyCode = Keys.ControlKey Then
CtrlKeyDown = False
End If
End Sub
End Class

[terryshi]

欧~好复杂~

[royluok]

只是给你一个思路,以此为基础再增加一下拖动的效果就不难了,不过要花一定时间去调试.写上面的代码不知不觉就花了我几个小时啊..