设置全局变量：
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Dim drag As Boolean
Dim mousex As Integer
Dim mousey As Integer
假设你想拖动的是Panel1控件，以及此控件上的 Label1（用于显示标题）和PictureBox4（用于显示图标）：
Private Sub TitleMove_MouseDown(sender As Object, e As System.Windows.Forms.MouseEventArgs) Handles Panel1.MouseDown, Label1.MouseDown, PictureBox4.MouseDown
drag = True
mousex = Windows.Forms.Cursor.Position.X - Me.Left
mousey = Windows.Forms.Cursor.Position.Y - Me.Top
End Sub
Private Sub TitleMove_MouseMove(sender As Object, e As System.Windows.Forms.MouseEventArgs) Handles Panel1.MouseMove, Label1.MouseMove, PictureBox4.MouseMove
If drag Then
Me.Top = Windows.Forms.Cursor.Position.Y - mousey
Me.Left = Windows.Forms.Cursor.Position.X - mousex
End If
End Sub
Private Sub TitleMove_MouseUp(sender As Object, e As System.Windows.Forms.MouseEventArgs) Handles Panel1.MouseUp, Label1.MouseUp, PictureBox4.MouseUp
drag = False
End Sub
你把 选项卡 拖到屏幕外面不就行了 只显示选项卡内东西 周围边缘都不要了 每个选项卡内配合labl 或按钮 标识不就行了。
DllImport("user32.dll", ExactSpelling:=True) _
Private Shared Function SetWindowPos(ByVal hWnd As IntPtr, ByVal hWndInsertAfter As IntPtr, ByVal X As Integer, ByVal Y As Integer, ByVal cx As Integer, ByVal cy As Integer, _
ByVal uFlags As UInteger) As Integer
End Function
Private Const GWL_STYLE As Integer = -16
Private Const GWL_EXSTYLE As Integer = -20
Private Const WS_BORDER As Integer = H800000
Private Const WS_EX_CLIENTEDGE As Integer = H200
Private Const SWP_NOSIZE As UInteger = H1
Private Const SWP_NOMOVE As UInteger = H2
Private Const SWP_NOZORDER As UInteger = H4
Private Const SWP_NOREDRAW As UInteger = H8
Private Const SWP_NOACTIVATE As UInteger = H10
Private Const SWP_FRAMECHANGED As UInteger = H20
Private Const SWP_SHOWWINDOW As UInteger = H40
Private Const SWP_HIDEWINDOW As UInteger = H80
Private Const SWP_NOCOPYBITS As UInteger = H100
Private Const SWP_NOOWNERZORDER As UInteger = H200
Private Const SWP_NOSENDCHANGING As UInteger = H400
Public Sub ChangeMdiClientBorderStyle(ByVal Value As System.Windows.Forms.BorderStyle, ByVal Handle As IntPtr)
Dim style As Integer = GetWindowLong(Handle, GWL_STYLE)
Dim exStyle As Integer = GetWindowLong(Handle, GWL_EXSTYLE)
' Add or remove style flags as necessary.
Select Case Value
Case BorderStyle.Fixed3D
exStyle = exStyle Or WS_EX_CLIENTEDGE
style = style And Not WS_BORDER
Exit Select
Case BorderStyle.FixedSingle
exStyle = exStyle And Not WS_EX_CLIENTEDGE
style = style Or WS_BORDER
Exit Select
Case BorderStyle.None
style = style And Not WS_BORDER
exStyle = exStyle And Not WS_EX_CLIENTEDGE
Exit Select
End Select
' Set the styles using Win32 calls
SetWindowLong(Handle, GWL_STYLE, style)
SetWindowLong(Handle, GWL_EXSTYLE, exStyle)
' Update the non-client area.
SetWindowPos(Handle, IntPtr.Zero, 0, 0, 0, 0, _
SWP_NOACTIVATE Or SWP_NOMOVE Or SWP_NOSIZE Or SWP_NOZORDER Or SWP_NOOWNERZORDER Or SWP_FRAMECHANGED)
End Sub
''' summary
''' 获取MDIClient句柄
''' /summary
''' returns/returns
''' remarks/remarks
Private Function getMdiClientHandle() As IntPtr
Dim Obj As MdiClient = Nothing
Dim t As Type
For Each Item As Control In Me.Controls
t = Item.[GetType]()
If t.Name = "MdiClient" Then
Obj = DirectCast(Item, MdiClient)
Exit For
End If
Next
If Obj IsNot Nothing Then
Return Obj.Handle
Else
Return IntPtr.Zero
End If
End Function
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
If Me.IsMdiContainer Then
ChangeMdiClientBorderStyle(BorderStyle.None, getMdiClientHandle)
End If
End Sub
这个类继承自Panel，把它加到你的项目里面，先运行一下，然后从工具箱里把它拖到窗体上，然后再向里面添加其它控件就可以了，支持Shift加选，Alt减选
Imports System.Linq
Imports System.Collections
Public Class MyPanel
Inherits Panel
' 选择模式，相交还是包含
Enum SelectMode
Intersects
Contains
End Enum
Dim down As New Point(-1, -1)
Dim rect As Rectangle
Dim selected As New List(Of Control)
Dim editting As IEnumerable(Of Control)
Dim mode As SelectMode = SelectMode.Contains
Dim shift, alt As Boolean
Public Sub New()
Me.DoubleBuffered = True
End Sub
Protected Overrides Sub OnMouseDown(e As MouseEventArgs)
MyBase.OnMouseDown(e)
down = e.Location
editting = selected.ToArray().ToList()
OnMouseMove(e)
End Sub
Protected Overrides Sub OnMouseMove(e As MouseEventArgs)
MyBase.OnMouseMove(e)
If e.Button = Windows.Forms.MouseButtons.Left Then
Dim loc As New Point(Math.Min(down.X, e.X), Math.Min(down.Y, e.Y))
Dim size As New Size(Math.Abs(down.X - e.X), Math.Abs(down.Y - e.Y))
rect = New Rectangle(loc, size)
Dim cs As New List(Of Control)
For Each c In Controls
cs.Add(c)
Next
Dim a = cs.Where(Function(n As Control) (mode = SelectMode.Contains And rect.Contains(n.Bounds)) Or (mode = SelectMode.Intersects And rect.IntersectsWith(n.Bounds)))
If shift Then editting = a.Union(selected) Else If alt Then editting = selected.Except(a) Else editting = a
Invalidate()
End If
End Sub
Protected Overrides Sub OnMouseUp(e As MouseEventArgs)
MyBase.OnMouseUp(e)
down = New Point(-1, -1)
selected = editting.ToList()
editting = Nothing
Invalidate()
End Sub
Protected Overrides Function ProcessKeyPreview(ByRef m As Message) As Boolean
Dim KeyCode As Keys = CInt(m.WParam) And CInt(Keys.KeyCode)
Dim d As Boolean
If m.Msg = H100 Or m.Msg = H104 Then d = True Else If m.Msg = H101 Or m.Msg = H105 Then d = False Else Return MyBase.ProcessKeyPreview(m)
If KeyCode = Keys.ShiftKey Then
shift = d
ElseIf KeyCode = Keys.Menu Then
alt = d
End If
Return MyBase.ProcessKeyPreview(m)
End Function
Protected Overrides Sub OnPaint(e As PaintEventArgs)
MyBase.OnPaint(e)
For Each c As Control In IIf(editting Is Nothing, selected, editting)
e.Graphics.DrawRectangle(New Pen(Color.Gray) With {.DashStyle = Drawing2D.DashStyle.DashDot}, c.Left - 1, c.Top - 1, c.Width + 1, c.Height + 1)
Next
If (down.X 0) Then e.Graphics.DrawRectangle(New Pen(Color.Gray) With {.DashStyle = Drawing2D.DashStyle.DashDot}, rect)
End Sub
End Class
Label是VB中的标签框控件，一般用来显示对其他控件功能进行说明性的文本信息。比如在学生信息管理系统中，在一个文本框前面加上一个Lable标题为“姓名”，提醒用户在这个Lable控件右边的文本框中输入学生姓名。
Label控件的边框属性为BorderStyle,一共有两种属性值：0和1。分别表示没有边框和固定边框，该属性在Label控件的属性表中通过单击鼠标选择设置：
示意图为：
1.在mouse事件中实现
2.调用windows API
实现方式为：
1.在mouse事件中实现
[csharp] view plain copy
Point mouseOff;//鼠标移动位置变量
bool leftFlag;//标签是否为左键
private void groupControl1_MouseUp(object sender, MouseEventArgs e)
{
if (leftFlag)
{
leftFlag = false;//释放鼠标后标注为false;
}
}
private void groupControl1_MouseMove(object sender, MouseEventArgs e)
{
if (leftFlag)
{
Point mouseSet = Control.MousePosition;
mouseSet.Offset(mouseOff.X, mouseOff.Y); //设置移动后的位置
Location = mouseSet;
}
}
private void groupControl1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
mouseOff = new Point(-e.X, -e.Y); //得到变量的值
leftFlag = true; //点击左键按下时标注为true;
}
}
private void groupControl1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
mouseOff = new Point(-e.X, -e.Y); //得到变量的值
leftFlag = true; //点击左键按下时标注为true;
}
}
2.调用windows API
调用前需要添加using System.Runtime.InteropServices;
[csharp] view plain copy
[DllImport("user32.dll")]
public static extern bool ReleaseCapture();
[DllImport("user32.dll")]
public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);
private void groupControl1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
ReleaseCapture(); //释放鼠标捕捉
//发送左键点击的消息至该窗体(标题栏)
SendMessage(Handle, 0xA1, 0x02, 0);
}
}
