B4J Question Returning to the main form

[khwarizmi]

Hi all

How can I return to the main form from another form after closing by: MainForm.Close?

thanks

 

[DonManfred]

Probably with

MainForm.Show

 

[khwarizmi]

MainForm contains the sub:

Sub AppStart (Form1 As Form, Args() As String)

I thought to call it but I didn't know any Args should I put.

 

[Chris2]

I think you're confusing MainForm with the Main code module of the app.
The Main code module contains AppStart which is called when the app starts up. MainForm is just the main/starting form of your UI program.

 

[khwarizmi]

Thanks Chris2
I got confused because all the code modules in my program contain the show event, which initialize the associated form and loads the layout in its root pane. Except for the main form, which initialize with:

Sub AppStart (Form1 As Form, Args() As String)

I noticed that any variable of type form has a shoe property.
Then I set the variable MainForm to public and the code:

MainForm.Show

works from anywhere.

 

[khwarizmi]

Now a new problem appeared when returning again to the second form (HomePg), which contains:

HomePg.SetFormStyle("TRANSPARENT")

Error message:

(IllegalStateException) java.lang.IllegalStateException: Cannot set style once stage has been set visible

 

[Chris2]

As the error says, you can't call Form.SetFormStyle after the form has already been shown.
I'd suggest you watch the Code Modules and Classes video tutorial:

B4X Programming Video Tutorials

www.b4x.com

In particular, from around the 18 minute mark, it explains about forms in class modules and code modules.

In code modules you need to use something like:

Public Sub Show
    If HomePg.IsInitialized=False Then
        HomePg.Initialize("HomePg", 600, 600)
        HomePg.RootPane.LoadLayout("HomePgLayout")
        HomePg.SetFormStyle("TRANSPARENT")
        :
        :
        etc
    End If
    :
    :
End Sub

 

[khwarizmi]

Thanks, now the error message is gone by inserting the code:

HomePg.SetFormStyle("TRANSPARENT")

inside the If statment, to be executed only when the form is not initialized.