4. [SOLVED]assign three slot to one signal.

[SOLVED]assign three slot to one signal.


  • Hi, i want assign three button's slot to a signal.
    @
    class MainWindow;
    }

    class MainWindow : public QMainWindow
    {
    Q_OBJECT

    public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    QSignalMapper *signalmapper;
    Ui::MainWindow *ui;
    void test(int);

    signals:
    void clickmee(int);
    public slots:
    void setclick1(int);
    void setclick2(int);
    void setclick3(int);

    private:

    };
    @
    i do this in constructor:
    @
    signalmapper = new QSignalMapper(this);
    signalmapper->setMapping(ui->pushButton, 10);
    signalmapper->setMapping(ui->pushButton1, 10);
    signalmapper->setMapping(ui->pushButton1, 10);
    connect(signalmapper, SIGNAL(mapped(int)),this,SIGNAL(clickmee(int)));
    @

    but when i run program in wrote:
    @
    QObject::connect: No such slot MainWindow::clickmee(int) in ..\Qsignal2\mainwindow.cpp:11
    QObject::connect: (receiver name: 'MainWindow')
    @
    how can i assign slots to signal?

    0
  • Lifetime Qt Champion

    Hi,

    clickmee(int) is a signal not a slot

    You can't assign slot to signals, only signals to slots and signals to signals.

    0

  • how can i do that? i want to send parameter(line int) to button click event how can i do that? when i use setclick(int) the slot not working but when i using setclick() it worked. i want to pass a parameter.

    0
  • Lifetime Qt Champion

    You're not really clear...

    What parameter line ?

    Also:
    @signalmapper = new QSignalMapper(this);
    signalmapper->setMapping(ui->pushButton, 10);
    signalmapper->setMapping(ui->pushButton1, 10);<-- why also 10 ?
    signalmapper->setMapping(ui->pushButton1, 10);<-- twice ?
    connect(signalmapper, SIGNAL(mapped(int)),this,SIGNAL(clickmee(int))); <-- Now a signal connected to a signal but is it really what you want ?
    @

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  • oh sorry your right. i edit that. but now how can i assign all button's click to this signal i.e when i click on every buttons clickmee(int) is called? clickmee(int) is implement in .moc file so i can't use from that.

    0
  • Lifetime Qt Champion

    It's done through the QSignalMapper.

    But are you sure you want clickmee to be a signal ?

    0

  • i want to do this
    @void setclick1(int x)
    {
    if(x== 10)
    {
    ....
    }
    else
    {
    ...
    }

    }
    @
    but this function not firing.

    0
  • Lifetime Qt Champion

    Because this slot is not connected.

    Change your mapper connection to

    @connect(signalmapper, SIGNAL(mapped(int)),this,SLOT(setclick1(int)));@

    0

  • i do that but that's not working this is my new code:

    @
    class MainWindow;
    }

    class MainWindow : public QMainWindow
    {
    Q_OBJECT

    public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    public slots:
    void click(QString);

    private:
    Ui::MainWindow *ui;
    QSignalMapper *signalmaper;

    };@

    .cpp
    @
    MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
    {
    ui->setupUi(this);
    signalmaper = new QSignalMapper(this);
    signalmaper->setMapping(ui->pushButton, QString("dfdf"));
    connect(signalmaper, SIGNAL(mapped(QString)),this, SLOT(click(QString)));
    }

    void MainWindow::click(QString x)
    {
    ui->pushButton->setText(x);
    }
    @

    0
  • Lifetime Qt Champion

    You forgot to connect the button clicked signal.

    @connect(ui->pushButton, SIGNAL(clicked()), signalMapper, SLOT(map()));@

    0

  • id didn't know that. special thanks to you .

    0
  • Lifetime Qt Champion

    Nothing special here, look at the "QSignalMapper":http://qt-project.org/doc/qt-4.8/qsignalmapper.html#details documentation

    0
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