form1.frm

来自「这里有很多很实用的VB编程案例,方便大家学习VB.」· FRM 代码 · 共 64 行

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "ListBox控件提示信息"
   ClientHeight    =   3195
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4680
   LinkTopic       =   "Form1"
   ScaleHeight     =   3195
   ScaleWidth      =   4680
   StartUpPosition =   3  '窗口缺省
   Begin VB.ListBox List1 
      Height          =   3120
      Left            =   0
      TabIndex        =   0
      Top             =   0
      Width           =   4695
   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 Declare Function SendMessage Lib "user32" Alias "SendMessageA" _
(ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, _
lParam As Any) As Long

Private Const LB_ITEMFROMPOINT = &H1A9

Private Sub Form_Load()
    With List1
        .AddItem "zmhh  http://zmhh.mycool.net"
        .AddItem "照猫画虎欢迎你的到来"
        .AddItem "老猫  [e-mail]"
    End With
End Sub

Private Sub List1_MouseMove(Button As Integer, Shift As Integer, X As Single, Y As Single)
    Dim mx As Long
    Dim my As Long
    Dim id As Long
    
    If Button = 0 Then
        ' 如果没有按钮被按下。
        mx = CLng(X / Screen.TwipsPerPixelX)
        my = CLng(Y / Screen.TwipsPerPixelY)
        With List1
            ' 获得当前的光标所在的的屏幕位置。
            id = SendMessage(.hwnd, LB_ITEMFROMPOINT, 0, ByVal ((my * 65536) + mx))
            ' 显示提示行或清除提示行。
            If (id >= 0) And (id <= .ListCount) Then
                .ToolTipText = "提示：" & .List(id)
            Else
                .ToolTipText = ""
            End If
        End With
    End If
End Sub