How to Open & Close a Widget ?!!

[Fatla]

Well , I've another inquiry .
- After I've opened a new widget , I 've put Button + QLineEdit @ the new open Widget just to test it .

- What I 've found out is that ctrls @ the new open widget don't call the slots I implement ?!!
- @ the new widget it's supposed when the user press the button , a text 'll be printed into QLineEdit .

- When I Put the code that print some text into QLineEdit into Constructor , it Works .
- Also when I use the built in slots (e.g. showMaximized() ) , it works .

- My Question : Why don't the ctrls @ the new open Widget call the slots I implement ?!!

N.B. : I've a Header + .cpp file to each form I've in order to implement my own slots .


The code which I use to open my new widget that's located @ the first .cpp which I implement into it the slots of the 1st widget :

CustomSlot2* widget = new CustomSlot2;
  widget->setAttribute(Qt::WA_DeleteOnClose);
  widget->show();

CustomSlot2* widget = new CustomSlot2;
  widget->setAttribute(Qt::WA_DeleteOnClose);
  widget->show();

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My .cpp file 's code , which I implement the slots of ctrls of 2nd new open widget :

#include"CustomSlot2.h"
 
#include "ui_Form2.h" 
 
CustomSlot2::CustomSlot2(QWidget *parent): QWidget(parent)
 {
    formTwo.setupUi(this);
 
 }
 
void CustomSlot2::PrintTxt
{
formTwo.txtData->setText("Alooooooo") ;
 
}

#include"CustomSlot2.h"

#include "ui_Form2.h" 

CustomSlot2::CustomSlot2(QWidget *parent): QWidget(parent)
 {
    formTwo.setupUi(this);

 }

void CustomSlot2::PrintTxt
{
formTwo.txtData->setText("Alooooooo") ;

}

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Thanks

[jpn]

Did you remember to add required Q_OBJECT macro to CustomSlot2 class? Did you remember to declare CustomSlot2::PrintTxt() as slot?

[Fatla]

Mmmmm , actually it was a SILLY error ; I forgot to write the keyword "slot" beside the access modifier @ header file .

By the way , what's the use of :

widget->setAttribute(Qt::WA_DeleteOnClose);

As when I 've commented it , nothing is changed !!

Thanks JPN

[jpn]

By the way , what's the use of :

widget->setAttribute(Qt::WA_DeleteOnClose);

As when I 've commented it , nothing is changed !!

It ensures that the widget gets deleted once closed. You know, closing a window doesn't delete it by default. And there is no parent to clean it up either because it has no parent, it's a top level widget aka window.

Thanks JPN

You're welcome.