tracbarsubclass.bas

本滚动条是在VB原有控件上的改进

Attribute VB_Name = "SubClass"
Option Private Module
Option Explicit
Public NextProcs As Long
Public Nodef As Boolean
Public Const WM_SIZE = &H5
Public Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long) As Long
Public Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Any) As Long
Public Declare Function CallWindowProc Lib "user32" Alias "CallWindowProcA" (ByVal wndrpcPrev As Long, ByVal hwnd As Long, ByVal uMsg As Long, ByVal wParam As Long, lParam As Any) As Long
Public Const GWL_USERDATA = (-21)
Public Const GWL_WNDPROC = -4
Public Function WindowProc(ByVal hwnd As Long, ByVal uMsg As Long, _
ByVal wParam As Long, ByVal lParam As Long) As Long
On Error Resume Next
  
Select Case hwnd


Case Form1.hwnd
     Form1.ProcMsg hwnd, uMsg, wParam, lParam, 0& ', 0&

End Select
If Nodef = True Then
WindowProc = CallWindowProc(NextProcs, hwnd, uMsg, wParam, ByVal lParam)
Else
Nodef = False
Nodef = True
End If
End Function