Form Question

Hi all:
when we resize the MDI parent form, we want to resize the MDI child form also, but how can we know which child form is visible at that time?
Thanks

[Peterson]

You probably have to loop thru all of the child MDIs and see if the .visible property is true.

If ChildForm1.Visible=True Then MsgBox "this child window is visible"

Or something to that effect.

-lp

I like complicated APIs sometimes, for they are cleaner in the job.

'NOTE: Option Compare Text is not needed, but since I thought it was lonely, I brought it up.
Option Explicit
Option Compare Text
Option Base 1
Public Declare Function FindWindowEx Lib "user32" Alias "FindWindowExA" _
(ByVal hWnd1 As Long, ByVal hWnd2 As Long, ByVal lpsz1 As String, _
ByVal lpsz2 As String) As Long

Public Declare Function GetWindowTextLength Lib "user32" Alias "GetWindowTextLengthA" _
(ByVal hwnd As Long) As Long
Public Declare Function GetWindowText Lib "user32" Alias "GetWindowTextA" _
(ByVal hwnd As Long, ByVal lpString As String, ByVal cch As Long) As Long
Public Declare Function IsWindowVisible Lib "user32" (ByVal hwnd As Long) As Long

Private Sub MDIForm_Click()
  Dim strs() As String, vis() As Boolean, hwd() As Long
  Dim hwndw As Long, lt As Long, hwdold As Long
  Dim ctc As Long
  ReDim strs(ctc) As String
  ReDim vis(ctc) As Boolean
  ReDim hwd(ctc) As Long
  hwdold = vbNull
  
SupP:
    hwndw = FindWindowEx(Me.hwnd, hwdold, vbNull, vbNull)
    If hwndw = vbNull Then GoTo SubP
    lt = GetWindowTextLength(hwndw)
    ctc = ctc + 1
    ReDim strs(ctc) As String
    ReDim vis(ctc) As Boolean
    ReDim hwd(ctc) As Long
    GetWindowText Me.hwnd, strs(ctc), ln
    vis(ctc) = IsWindowVisible(hwndw)
    hwd(ctc) = hwndw
    hwdold = hwndw
GoTo SupP

SubP:
End Sub

API

[Joacim Andersson]

You could also use the Forms collection to do the resize.
Add code simular to this in the Resize event of the MDI form.

Private Sub MDIForm_Resize()
    Dim frm As Form
    For Each frm In Forms
        If frm.Name <> Me.Name Then
            If frm.MDIChild = True Then
                'do the resizing here
                frm.Move 0, 0, Me.ScaleWidth, Me.ScaleHeight
            End If
        End If
    Next
End Sub

Best regards