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OlimilO

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1

Saturday, February 7th 2009, 12:55am

Modal Dialog

Hi @All

I was wondering now a while how to open a Form in modal mode.

in VB6 you are used to the Show-Command of a Form like this:

Jabaco Source

 
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Form2.Show vbModal


I found a Thread by Peter, where Manuel said something abound JDialog:

Common Questions to Forms (Open and Close)

but in the heck how to implement this?

in VB6 I am using modal Dialogs like in the following peace of Code:

Form1:
CommandButton: Command1

Jabaco Source

 
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Option Explicit 
Private m_Pt As MyPoint 

Public Sub Form_Load() 
   Set m_Pt = New_MyPoint(123.456, 345.678) 
End Sub 

Private Sub Command1_Click() 
   Dim F As New Form2 
   If F.ShowDialog(m_Pt) = vbOK Then 
      MsgBox m_Pt.ToString 
   End If 
End Sub


Form2:
TextBox: Text1, Text2
CommandButton: BtnOK, BtnCancel

Jabaco Source

 
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Option Explicit 
Private m_RetVal As VbMsgBoxResult 
Private m_Point As MyPoint 

Public Function ShowDialog(Point As MyPoint) As VbMsgBoxResult 
   Set m_Point = Point 

   Text1.Text = m_Point.X 
   Text2.Text = m_Point.Y 

   Call Me.Show(vbModal) 

   ShowDialog = m_RetVal 

End Function 
Private Sub BtnOK_Click() 
   m_RetVal = vbOK 
   Call m_Point.Parse(Text1.Text, Text2.Text) 
   Unload Me 
End Sub 
Private Sub BtnCancel_Click() 
   m_RetVal = vbCancel 
   Unload Me 
End Sub


in Jabaco you can do this very similar. What you need is a JDialog variable beacuse only the JDialog has the ability to show modal, and you simply transfer alle Controls from the Form to the JDialog.

Use this function in Jabaco to make a JDialog out of your Form:

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Public Function GetModalDialog(Frm As Form) As JDialog 
   GetModalDialog = New javax#swing#JDialog 
   GetModalDialog.setModal(True) 
   GetModalDialog.reshape(Frm.Left, Frm.Top, Frm.Width, Frm.Height) 
   Dim D As New Dimension(Frm.Width, Frm.Height) 
   GetModalDialog.setMinimumSize(D) 
   'transfer the whole stuff from the Form to the JDialog 
   GetModalDialog.setContentPane(Frm.ContentFrame) 
   GetModalDialog.setTitle(Frm.Caption) 
End Function


Now the Code inside the forms, you can write it down something like this:

Form1:

Jabaco Source

 
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Option Explicit 
Private m_Pt As MyPoint 

Public Sub Form_Load() 
   m_Pt = New MyPoint(123.456, 345.678) 
End Sub 

Public Sub Command1_Click() 
   Dim F As New Form2 
   F.Parent.hide 
   If F.ShowDialog(m_Pt) = vbOK Then 
      MsgBox m_Pt.toString 
      F.Parent.dispose 
   End If 
End Sub


Form2:

Jabaco Source

 
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Option Explicit 
Private m_Dlg As JDialog 
Private m_RetVal As VBMsgBoxResult 
Private m_Point As MyPoint 

Public Function ShowDialog(Point As MyPoint) As VBMsgBoxResult 

   Set m_Point = Point 

   Text1.Text = CStr(Point.X) 
   Text2.Text = CStr(Point.Y) 

   Set m_Dlg = GetModalDialog(Me): m_Dlg.show 

   ShowDialog = m_RetVal 

   Me.Parent.dispose 

End Function 
Public Sub BtnOK_Click() 
   m_RetVal = vbOK 
   m_Point.Parse(Text1.Text, Text2.Text) 
   m_Dlg.dispose 
End Sub 
Public Sub BtnCancel_Click() 
   m_RetVal = vbCancel 
   m_Dlg.dispose 
End Sub


Hopefully that this can help a little bit,

greetings

OlimilO
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OlimilO

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2

Thursday, February 26th 2009, 6:02pm

ModalDialog II

Hi @all,

The last solution maybe is suitable if you have only one modal dialog in your project. But as it grows bigger and bigger you maybe gain for a simpler and more generalized solution.
Of course there are some things that can be extracted and put togehter in one single class: ModalDialog


The class should do the main work for us that is always the same in every modal dialog.

* showing the form/Dialog
* substitute the contentpane (needed here)
* transfering any desired object (that will be changed by the user in the Form)
* reacting on the the click-events
* returning the result-value (OK/Cancel)
* disposing the form (unloading)

What other solutions could be thought of?
Maybe another solution would be to have a property-switch in the property-Editor of Jabaco that makes a modal Form out of a normal Form, or maybe you could select a base class others than VB/Form.

Such solutions also look better to me, but in the meantime you can use this small and simple approach:

* Every form that you want to show in modal mode has to do theses two things:

1) implement the interface IModalDialog that only consists of two methods:

Jabaco Source

 
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Public Sub Init(md As ModalDialog, obj As Object)
End Sub
Public Function Accept() As Boolean
End Function

2) hold a membervariable of the desired object that the user wants to change with the dialog
and implement the procedures to show, validate and to pass editable values.

this is an example of the form:

Jabaco Source

 
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Option Explicit
Implements IModalDialog
Private m_Pt As MyPoint
Public Sub Init(md As ModalDialog, obj As Object)
   
   'Do some initializing stuff
   
   'First set the buttons
   md.SetButtons(Me.BtnOK, Me.BtnCancel)
   
   'Set the desired object
   m_Pt = Cast(obj, MyPoint)
   
   'Show the values from the object in the textboxes of the dialog
   Me.TxtX.Text = CStr(m_Pt.X)
   Me.TxtY.Text = CStr(m_Pt.Y)
End Sub
Public Function Accept() As Boolean
   '
   ' implement something like this 
   ' here the variables will be validated
   ' and in case everything is valid
   ' the user input will be passed and
   ' the function returns True 
   ' 
   Dim errmsg As String
   Dim msg As String = "Please give a numeric value for "
   
   If Not IsNumeric(txtX.Text) Then _
      errmsg  = errmsg & msg & "x: " & txtX.Text & vbCrLf
      
   If Not IsNumeric(txtY.Text) Then _
      errmsg  = errmsg & msg & "y: " & txtY.Text & vbCrLf
   
   'if there were errors the errormessage is not null
   If Len(errmsg) > 0 Then
      MsgBox errmsg 
      Accept = False
   Else   
      m_Pt.Parse(Me.TxtX.Text, Me.TxtY.Text)
      Accept = True
   End If
   
End Function


the class ModalDialog:

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Option Explicit
Implements java#awt#Event#MouseListener
Private m_Result    As VBMsgBoxResult
Private m_Form      As Form
Private m_IForm     As IModalDialog
Private m_BtnAccept As CommandButton
Private m_BtnCancel As CommandButton
Public Sub ModalDialog(aFrm As IModalDialog)
   m_IForm = aFrm
   m_Form = Cast(m_IForm, Form)
   m_Form.Visible = False
   Me.setContentPane(m_Form.ContentFrame)
   Me.setLocation(New Point(m_Form.Left, m_Form.Top))
   Me.setSize(New Dimension(m_Form.Width, m_Form.Height))
   Me.setTitle(m_Form.Caption)
   Me.setModal(True)
End Sub
Public Function ShowDialog(obj As Object) As VBMsgBoxResult
   m_IForm.Init(Me, obj)
   Me.show
   ShowDialog = m_Result
End Function
Public Sub SetButtons(aBtnOK As CommandButton)
    Me.SetButtons(aBtnOK, Nothing)
End Sub
Public Sub SetButtons(aBtnOK As CommandButton, aBtnCancel As CommandButton)
   m_BtnAccept = aBtnOK 
   m_BtnCancel = aBtnCancel 
   m_BtnAccept.Parent.addMouseListener(Me)
   m_BtnCancel.Parent.addMouseListener(Me)    
End Sub
Public Sub mouseClicked(arg2 As MouseEvent)
   If arg2.getComponent = m_BtnAccept Then
      If m_IForm.Accept Then
         m_Result = vbOK
         m_Form.dispose
         m_Form = Nothing
         Me.dispose
      End If
   ElseIf arg2.getComponent = m_BtnCancel Then
      m_Result = vbCancel
      Me.dispose 
   End If   
End Sub
Public Property Get DialogResult As VBMsgBoxResult
   DialogResult = m_Result
End Property
Public Property Get IsAccepted() As Boolean
   IsAccepted = (m_Result = vbOK)
End Property
Public Property Get IsCanceled() As Boolean
   IsCanceled = (m_Result = vbCancel)
End Property
' =+=+=+=+=+=+=+=+ ' will not be used ' =+=+=+=+=+=+=+=+ ' 
Public Sub mousePressed(arg2 As MouseEvent)
End Sub
Public Sub mouseReleased(arg2 As MouseEvent)   
End Sub
Public Sub mouseEntered(arg2 As MouseEvent)   
End Sub
Public Sub mouseExited(arg2 As MouseEvent)   
End Sub


greetings

OlimilO
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OlimilO

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3

Sunday, July 25th 2010, 8:32pm

It must be stated that this thread is rather outdated. this approach was necessary only in ther first beta versions of Jabaco.

Of course in the latest Jabaco version 1.5.2 there is already a Dialog-Form that should better be used for modal dialogs.

regards

OlimilO

Widera IT-Solutions

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4

Saturday, September 18th 2010, 3:36pm

Nice, but how does it works?

Dim myForm As Variant = New frmInfo
myForm.Show(vbModal)
... brings up an Exception


frmInfo.Show(vbModal)
... could not be compiled :-(

Peter

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5

Saturday, September 18th 2010, 6:39pm

@Widera IT-Solutions:

showing a modal Dialog (as mentioned above from OlimilO) should be the easiest solution:

Jabaco Source

 
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Dim myDialog As New Dialog1
myDialog.Show(vbModal)


Greetings ... Peter
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  • 2010-09-18 18h31_22.png

This post has been edited 1 times, last edit by "Peter" (Sep 19th 2010, 3:27am)

Widera IT-Solutions

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6

Monday, September 20th 2010, 10:53am

@Peter


THX for hint!
Do you know the real difference between Forms and Dialogs in Jabaco? (definition)


cu,
Phil

This post has been edited 1 times, last edit by "Widera IT-Solutions" (Sep 20th 2010, 11:04am)

A1880

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7

Monday, September 20th 2010, 1:09pm

Dialog is a subclass of JDialog.
The implementation can be found here. Dialogs are typically called from within a Form or another Dialog.
However, it might be possible to use a Dialog as user interface of a complete application. But I've never seen this in practice.

Form is derived from AbstractForm as described here. Forms are used as containers for a complete application. They can have min/max icons, system menus, user menus, etc.

You might want to look at the code to get to know the differences in detail.

Greetings

A1880

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