Solved

How to Emulate a Modal Form in VB

Posted on 2002-07-03
4
321 Views
Last Modified: 2012-05-04
Showing Drop-Down Forms from Modal Forms.

One problem with this technique is that you cannot use it directly from a form shown with modally in VB, otherwise you get the error message "Can't show non-modal form when modal form is displayed". There 'must' be a workaround for this problem by which you can emulate showing the form modally.
 
Can anybody help me out with this problem ?
Thanks
0
Comment
Question by:Temujin
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
4 Comments
 
LVL 2

Accepted Solution

by:
fnizet earned 100 total points
ID: 7127233
You can disable the calling form.
Let's say MainForm calls ModalForm (which is not modal at all), you'll do
ModalForm.Show
MainForm.enabled = false

Then in ModalForm, you can do to call your DropDownForm :
DropDownForm.Show
ModalForm.enabled = false

When you close your "modal-est" form, you just enable the calling form. Let's say you have a button to close the DropDownForm :
Sub CloseDropDown_Click()
    Me.Hide
    ModalForm.enabled = true
End Sub

0
 
LVL 2

Expert Comment

by:fnizet
ID: 7127292
To work properly, you may need to define 2 functions, one to call a modal form, the other to return from a modal form. You need to manage an array of the forms you locked, because several forms may need to be locked :

Dim lockedForms(1, 3)

Sub callModal ( calledForm as Form, caller as Form)
for each f in Forms
  if (f.hwnd<>calledForm.hwnd) ' prevent from self locking in case called form is already loaded
     And (f.enabled) then
    f.enabled = false
    i = Ubound(lockedForms(1))
    Redim Preserve lockedForms(i+1, 3)
    lockedForms(i, 1) = calledForm.hwnd 'save ID of calledForm, prevents unlocking of previously lock forms
    lockedForms(i, 2) = f.hwnd 'save ID of locked form
    lockedForms(i, 3) = caller.hwnd ' just to know which form to unlock
  end if
next
calledForm.Show

End Sub

Sub unlockForms(modalForm as Form)
  Dim formToShow As Form
  n = Ubound(lockedForms(1))
  do while (n>0 and lockedForms(n, 1) = modalForm.hwnd)
    for each f in Forms
      if f.hwnd = lockedForms(n, 3) then Set formToShow = f
      if f.hwnd = lockedForms(n, 2) then
        f.enabled = true
        exit for
      end if
    next
    n = n - 1
  loop

  Redim Preserve lockedForms(n+1, 3)
  modalForm.hide
  formToSHow.Show
End Sub

I have not tested this code, but the idea is here.
0
 

Author Comment

by:Temujin
ID: 7130446
your first method worked fine in my project.

Thank you very much mr fnizet.
0
 
LVL 2

Expert Comment

by:fnizet
ID: 7131273
you're welcome and thanks for the A grade.
0

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

The debugging module of the VB 6 IDE can be accessed by way of the Debug menu item. That menu item can normally be found in the IDE's main menu line as shown in this picture.   There is also a companion Debug Toolbar that looks like the followin…
If you have ever used Microsoft Word then you know that it has a good spell checker and it may have occurred to you that the ability to check spelling might be a nice piece of functionality to add to certain applications of yours. Well the code that…
Get people started with the process of using Access VBA to control Outlook using automation, Microsoft Access can control other applications. An example is the ability to programmatically talk to Microsoft Outlook. Using automation, an Access applic…
Get people started with the utilization of class modules. Class modules can be a powerful tool in Microsoft Access. They allow you to create self-contained objects that encapsulate functionality. They can easily hide the complexity of a process from…

739 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question