用api根据listbox最长项目的宽度来设置滚动条.frm

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VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "设定适当宽度的水平滚动条"
   ClientHeight    =   2670
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   3630
   BeginProperty Font 
      Name            =   "MS Serif"
      Size            =   12
      Charset         =   0
      Weight          =   400
      Underline       =   0   'False
      Italic          =   0   'False
      Strikethrough   =   0   'False
   EndProperty
   LinkTopic       =   "Form1"
   ScaleHeight     =   2670
   ScaleWidth      =   3630
   StartUpPosition =   3  'Windows Default
   Begin VB.CommandButton Command1 
      Caption         =   "设定适当宽度的水平滚动条"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   9
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   495
      Left            =   120
      TabIndex        =   1
      Top             =   2040
      Width           =   3375
   End
   Begin VB.ListBox List1 
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   9
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   1680
      ItemData        =   "用API根据ListBox最长项目的宽度来设置滚动条.frx":0000
      Left            =   120
      List            =   "用API根据ListBox最长项目的宽度来设置滚动条.frx":0187
      TabIndex        =   0
      Top             =   120
      Width           =   3375
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit

Private Sub Command1_Click()
    Dim max As Long, f As Font, i As Integer
    
    Me.ScaleMode = vbPixels
    Set f = Me.Font
    Set Me.Font = List1.Font
    
    With List1
        For i = 0 To .ListCount
        If Me.TextWidth(.List(i)) > max Then
            max = Me.TextWidth(.List(i))
        End If
        Next
    End With
    max = max + 10

    Set Me.Font = f
    
    SendMessage List1.hwnd, LB_SETHORIZONTALEXTENT, max, ByVal 0&
End Sub