Add a OnMoving Event to your Forms
With this example, you can have "stuff happen" when a form is moved on the screen.
Option Explicit
'API Types
Public Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type
'API Constants
Const WM_MOVING = 534
Const GWL_WNDPROC = (-4)
'API declarations
Private Declare Function SetWindowLong Lib "user32.dll" Alias "SetWindowLongA" (ByVal hWnd As Long, ByVal nindex As Long, ByVal dwnewlong As Long) As Long
Private Declare Function CallWindowProc Lib "user32.dll" Alias "CallWindowProcA" (ByVal lpPrevWndFunc As Long, ByVal hWnd As Long, ByVal Msg As Long, ByVal wParam As Long, lParam As RECT) As Long
Private Declare Function DefWindowProc Lib "user32.dll" Alias "DefWindowProcA" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Dim OldhWndProc As Long
Private Function OnMove(ByVal hWnd As Long, ByVal uMsg As Long, ByVal wParam As Long, lParam As RECT) As Long
'Handle the OnMove event
If uMsg = WM_MOVING Then
'The form is moving!!
Form1.Label1.Caption = lParam.Left & " " & lParam.Top
'Insert your code HERE
End If
'Call the old WindowProc
OnMove = CallWindowProc(OldhWndProc, hWnd, uMsg, wParam, lParam)
End Function
Public Sub InstallOnMovingEvent(frm As Form)
'Install the new WindowProc - SubClassing
OldhWndProc = SetWindowLong(frm.hWnd, GWL_WNDPROC, AddressOf OnMove)
End Sub
Public Sub RemoveOnMovingEvent(frm As Form)
'Restore the original WindowProc
SetWindowLong frm.hWnd, GWL_WNDPROC, OldhWndProc
End Sub
Usage
Private Sub Form_Load()
InstallOnMovingEvent Me
End Sub
Private Sub Form_Unload(Cancel As Integer)
RemoveOnMovingEvent Me
End Sub
Special Instructions
This code originally appeared on AndreaVB.com, and has been republished here with the permission of Andrea Tincani.
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