屏敝文本框菜单和用户定义标题栏.bas

个人VB学习源码精选,自己学习时的一些编程小程序,希望对大家有帮助

Attribute VB_Name = "Module1"
Option Explicit

Public Const GWL_WNDPROC = (-4)

Public Const WM_NCHITTEST = &H84
Public Const WM_LBUTTONDOWN = &H201
Public Const WM_RBUTTONDOWN = &H204

Public Const HTCLIENT = 1
Public Const HTCAPTION = 2

Type RECT
        Left As Long
        Top As Long
        Right As Long
        Bottom As Long
End Type

Declare Function GetWindowRect Lib "user32" (ByVal hwnd As Long, lpRect As RECT) As Long
Declare Function GetClientRect Lib "user32" (ByVal hwnd As Long, lpRect As RECT) As Long

Declare Function CallWindowProc Lib "user32" Alias "CallWindowProcA" (ByVal lpPrevWndFunc As Long, ByVal hwnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long) As Long
Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long

Public prevWndProc(1) As Long

Function WndProcForForm1(ByVal hwnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
    WndProcForForm1 = CallWindowProc(prevWndProc(0), hwnd, Msg, wParam, lParam)
   
    If Msg = WM_NCHITTEST And WndProcForForm1 = HTCLIENT Then
        If Form1.IsInImage(lParam Mod 65536, lParam \ 65536) Then
            WndProcForForm1 = HTCAPTION
        End If
    End If
End Function

Function WndProcForText1(ByVal hwnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
    If Msg = WM_RBUTTONDOWN Then
        Msg = WM_LBUTTONDOWN
    End If
    WndProcForText1 = CallWindowProc(prevWndProc(1), hwnd, Msg, wParam, lParam)
End Function