QDialogButtonBox connecting with function

[dor...@sezampro.rs]

Hi !

 

Can I use QDialogButtonBox in Harbour ?

 

Using QT Designer I created dialog windows with several widgets and one buttonBox containing two standard buttons Ok and Cancel.

 

I tried to connect function with either buttons Ok and Cancel but no success. I used oWnd:buttonBox:Cancel:connect ("clicked()", { || Fcncl () }).

 

Also tried some other syntax variants with no result.

 

It seems I do not know proper syntax for connecting buttonBox standard buttons with my function.

 

Can anyone help me ?

 

Regards,

 

Dordije.

 

 

[Pritpal Bedi]

Hi

I tried to connect function with either buttons Ok and Cancel but no success. I used

 

oWnd:buttonBox:Cancel:connect ("clicked()", { || Fcncl () }).

oWnd:buttonBox is a container only.

HbQt addresses the controls directly without its parent reference.

So, suppose the cancel button has this name (check in your .ui), 

   pushButtonCancel

Then access it as 

   oWnd:pushButtonCancel

Pritpal Bedi

a student of software analysis & concepts

[Dordije]

 

Hi Pritpal,

I tried with direct referencing button but no success. Standard buttons in button box do not have attribute “name”.

This is part of my ui file:

 

<widget class="QDialogButtonBox" name="buttonBox">

<property name="geometry">

  <rect>

   <x>240</x>

   <y>660</y>

   <width>341</width>

   <height>32</height>

  </rect>

</property>

<property name="orientation">

  <enum>Qt::Horizontal</enum>

</property>

<property name="standardButtons">

  <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>

</property>

</widget>

 

This widget is inside widget of QDialog class (in my code it is oWnd).

 

I tried with oWnd:Cancel:connect ("clicked()", { || Fcncl () }). Is this proper syntax in my case ?

 

In Qt documentation I found this:

 

void QDialogButtonBox::clicked ( QAbstractButton * button ) [signal]

This signal is emitted when a button inside the button box is clicked. The specific button that was pressed is specified by button.

In clicked slot I must specify  QAbstractButton * button  but how ? 

 

Regards,

 

Dordije.

 

[Pritpal Bedi]

Hi Dordije

 

In Qt documentation I found this:

 

void QDialogButtonBox::clicked ( QAbstractButton * button ) [signal]

This signal is emitted when a button inside the button box is clicked. The specific button that was pressed is specified by button.

In clicked slot I must specify  QAbstractButton * button  but how ? 

Ah OK.

oWnd:oDialogButtonBox:connect( "clicked(QAbstractButton*)", { |oButton|  ManageButton( oButton ) } )

then based on the text of oButton take appropriate action.

Alternatively:

Do not use QDialogButtonBox(). Instead have a QGroupBox containing 

two push buttons, <Cancel> and <OK>, name them as you wish and access from 

.prg code.

[Dordije]

 

Hi Pritpal,

sorry I am late with answer  because I needed to try your suggestions.

 

First I started with oWnd:oDialogButtonBox:connect( "clicked(QAbstractButton*)", { |oButton|  ManageButton( oButton ) } ) command.

Program was aware of ManageButton function.

In ManageButton function I did test what button is clicked with IF oButton==QDialogButton_Ok. But whenever I click on either of standard buttons I got Windows error that say “TESTGUI.EXE stops execution ...” and execution crashed.

In hb_out.log I can see that it is something concerning QDIALOG:EXEC with Application Internal Error, Unrecoverable error 6005 message. Also reported big list of modules from \Windows\System32 folder.

 

Even without testing (in ManageButton function I only have some MsgInfo(“...”) command ), again I got stop execution error.

 

So I decided to try QGroupBox as you suggested. That worked well for me. I can control OK and Cancel buttons in proper way.

 

Later these days I will again try with QDialogButtonBox creating some other simplier example. If I succeed will report what I did.

 

Thank you for your time.

 

Regards,

 

Dordije.

 

 

 

[Pritpal Bedi]

Hi

First I started with oWnd:oDialogButtonBox:connect( "clicked(QAbstractButton*)", { |oButton|  ManageButton( oButton ) } ) command.

Program was aware of ManageButton function.

In ManageButton function I did test what button is clicked with IF oButton==QDialogButton_Ok. But whenever I click on either of standard buttons I got Windows error that say “TESTGUI.EXE stops execution ...” and execution crashed.

And here you are making a big mistake.

oButton is of type QAbstractButton and you are comparing it with a NUMERIC, how come ?

[Dordije]

Hi Pritpal !

 

// And here you are making a big mistake.

// oButton is of type QAbstractButton and you are comparing it with a NUMERIC, how come ?

 

In some examples on Internet I found that can test clicked button with:

................

void CProgOptions::on_buttonBox_clicked(QAbstractButton *button)
{
    if(button== buttonBox->button(QDialogButtonBox::Reset) )

   {
         HERE GOES SOME CODE
    }
}

..............

 

According to this in ManageButtons I did button test with

 

IF oButton==buttonBox:button(QDialogButton_Ok)

 

but with same crashing (precisely, message is “TESTGUI.EXE has stopped working”).

 

Some examples on Internet suggested to try with:

 

IF buttonBox:standardButton(oButton)==QDialogButtonBox_Apply    or with

 

IF buttonBox:buttonRole(oButton)==QDialogButtonBox_AcceptRole

 

In all my tries program crashes.  When I do not use clicked slot, program do not crash.

 

I am aware that I do not have enough knowledge about HbQt.

 

Please, can you tell me what do I must read to learn wrapper functions for QT in Harbour.

 

Now I use QGroupBox instead QdialogButtonBox.

 

Regards,

 

Dordije.

 

 

[Pritpal Bedi]

Hi Dorgie

void CProgOptions::on_buttonBox_clicked(QAbstractButton *button)
{
    if(button== buttonBox->button(QDialogButtonBox::Reset) )

   {
         HERE GOES SOME CODE
    }
}

Comparison like this is not possible in HbQt as class object holding 

the Qt object is constructed new every first call.  C++ does right any way.

IF oButton==buttonBox:button(QDialogButton_Ok)

As above.

 IF buttonBox:standardButton(oButton)==QDialogButtonBox_Apply    or with

 

IF buttonBox:buttonRole(oButton)==QDialogButtonBox_AcceptRole

The above call should be ok, but if not, then seems some Qt bug.

 

Please, can you tell me what do I must read to learn wrapper functions for QT in Harbour.

You are already looking at right places.

  

Now I use QGroupBox instead QdialogButtonBox.

When you do not find correct usage via some object it is always safe to look for work-arounds.

[Luigi Ferraris]

Hi Pritpal,
I jump on this old post because I have the same problem: program crash creating hb_out.log

Here snipped code:
oDlgButtonBox:connect( "clicked(QAbstractButton*)", { |o| udfClickedBut(o) } )

STATIC PROCEDURE udfClickedBut(o)
   hb_trace( HB_TR_ALWAYS, o:className() + " clicked" )
RETURN

where oDlgButtonBox is QDialogButtonBox with three standards button: QDialogButtonBox_Ok, QDialogButtonBox_Cancel, QDialogButtonBox_Help

all other QDialogButtonBox signals work fine.

Regards
Ferraris Luigi