Signals & Slots Question

[zeroptr]

Hi all,

I have a simple class like this

#include <QObject>

class vitem : public QObject
{
    Q_OBJECT
public:
    explicit vitem(QObject *parent = 0);
    void setboolvalue(bool value);
    void setintvalue(int ideger);
private:
    bool b_value = false;
    int i_value = 0;

signals:
    void boolvaluechanged(bool value);
    void intvaluechanged(int ideger);
public slots:

};

vitem::vitem(QObject *parent) : QObject(parent)
{

}

void vitem::setboolvalue(bool value)
{
   if(value != b_value){
       b_value = value;
       emit boolvaluechanged(value);
   }
}

void vitem::setintvalue(int ideger)
{
    if(ideger != i_value){
        i_value = ideger;
        emit intvaluechanged(ideger);
    }
}

and I want to connect the boolvaluechanged(bool) signal to a a forms button::setflat true;

and I do this

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private slots:


    void on_btnDENE_clicked(bool checked);

private:
    Ui::MainWindow *ui;
    vitem *theItem;
};
ui->setupUi(this);
    theItem = new vitem;
    connect(theItem,SIGNAL(boolvaluechanged(bool)),this->ui->vlfESTERQUAD_2 ,SLOT(setFlat(bool)));

I could not connect vitems boolvaluechanged to forms button?
I triad many variations but no success, what am I doing wrong ?

any help??

[SGaist]

Hi,

How do you know it's not connected ?

When are you changing the value of your vitem object ?

[zeroptr]

sorry..

it says

QObject::connect: No such slot QPushButton::setFlat(bool) in ..\Multi_proc_dene\mainwindow.cpp:10
QObject::connect: (receiver name: 'vlfESTERQUAD_2')

and

I put another button and whan clicked

void MainWindow::on_btnDENE_clicked(bool checked)
{
theItem->setboolvalue(checked);
}

[Flotisable]

@zeroptr
QPushButton does not have a slot named setFlat, setFlat is a member function of QPushButton

if you want to use signal and slot to set the flat property of QPushButton, maybe you can use lambda expression

[Venkatesh V]

Hi @zeroptr
setFlat is an member fuction of QPushButton. so In your case you could have to do like this

connect(theItem,vitem::boolvaluechanged(bool),this->ui->vlfESTERQUAD_2 ,QPushButton::setFlat(bool));

[zeroptr]

@Venkatesh-V said in Signals & Slots Question:

connect(theItem,vitem::boolvaluechanged(bool),this->ui->vlfESTERQUAD_2 ,QPushButton::setFlat(bool));

E:\VikingUretim\Multi_proc_dene\Multi_proc_dene\mainwindow.cpp:11: error: expected primary-expression before 'bool'
connect(theItem,vitem::boolvaluechanged(bool),this->ui->vlfESTERQUAD_2 ,QPushButton::setFlat(bool));
^

gives error like this..

[Venkatesh V]

Hi @zeroptr

Sorry try this,

connect(theItem,&vitem::boolvaluechanged,this->ui->vlfESTERQUAD_2 ,&QPushButton::setFlat);

reply quote 0

[zeroptr]

@Venkatesh-V

Thank's a lot solved :)