Show Window

How do i make a windows show its contents while being dragged, without setting the windows property "show windows contents while dragging" to true. i notice programs like winamp are able to do this...is it possible in vb to do for my program

many thanks

There is an API method to do this - someone asked this question here before. Not sure what the answer was - search through the messages of about 1.5 weeks ago to find it.


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TheLeeMan

The reason why the window contents are shown when the form is being dragged, is that the window dragging is not handled by Windows. You could try searching VB-World for "How to move a form without a title bar". This method moves the window instead of dragging it, and Windows does not hide the contents.

Try This:

In a Module..

Code:

---

Private Type POINTAPI
        x As Long
        y As Long
End Type

Private Declare Function GetCursorPos Lib "user32" (lpPoint As POINTAPI) As Long

Public Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Private 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

Public Const GWL_WNDPROC = (-4)
Private Const WM_NCLBUTTONDOWN = &HA1
Private Const WM_MOVING = &H216

Public lPrevWnd As Long

Public Function SubClassedWindow(ByVal hwnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
    Static tStart As POINTAPI
    Dim tPos As POINTAPI
    If Msg = WM_NCLBUTTONDOWN Then
        Call GetCursorPos(tStart)
        tStart.x = tStart.x - Form1.ScaleX(Form1.Left, vbTwips, vbPixels)
        tStart.y = tStart.y - Form1.ScaleY(Form1.Top, vbTwips, vbPixels)
    ElseIf Msg = WM_MOVING Then
        Call GetCursorPos(tPos)
        Form1.Move Form1.ScaleX(tPos.x - tStart.x, vbPixels, vbTwips), Form1.ScaleY(tPos.y - tStart.y, vbPixels, vbTwips)
    End If
    SubClassedWindow = CallWindowProc(lPrevWnd, hwnd, Msg, wParam, lParam)
End Function

---

In the Form..

Code:

---

Private Sub Form_Load()
    lPrevWnd = SetWindowLong(hwnd, GWL_WNDPROC, AddressOf SubClassedWindow)
End Sub

Private Sub Form_Unload(Cancel As Integer)
    Call SetWindowLong(hwnd, GWL_WNDPROC, lPrevWnd)
End Sub

---

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Aaron Young
Analyst Programmer
[email protected]
[email protected]

I got an example. Witch allso snaps. The downside is that you can't use windows' titlebar. You'll have to make a fake one.