custom slot/signal

[jacek]

why i have to move the moc directive down

Because main.moc contains implementation of myWidget methods (which were added by Q_OBJECT macro) and in C++ you have to place method implementation after corresponding class definition.

[awnjoor]

sigh, im trying to do the custom slot/signal again but it is not working. here is the code

#include<QTableWidgetItem>
#include<QApplication>
#include<QWidget>
#include<QPushButton>
#include<QLabel>
#include<QFont>
#include<QLineEdit>
#include<QTableWidget>
#include<QVBoxLayout>
#include<QHBoxLayout>
#include<QStringList>
#include<QtSql/QSqlDatabase>
#include<QtSql/QSqlQuery>
#include<QString>
#include<QObject>
 
class myWidget:public QWidget{
    Q_OBJECT
 
    public:
        myWidget(QWidget *parent=0);
 
    private slots:
        void processInput();
 
    private:
        QLabel *displayItem;
        QLineEdit *itemnumber;
};
 
myWidget::myWidget(QWidget *parent)
    :QWidget(parent)
{
    setWindowState(Qt::WindowFullScreen);
 
    QLabel *title = new QLabel;
    title->setFont(QFont("Verdana", 30, 0));
    title->setText("title");
    title->setAlignment(Qt::AlignHCenter);
 
    QLabel *item=new QLabel;
    item->setFont(QFont("verdana", 15, QFont::Bold));
    item->setText("Item");
 
    displayItem=new QLabel;
    //displayItem->setFont(QFont("verdana", 15, QFont::Bold));
    //displayItem->setText("asdf");
 
    itemnumber=new QLineEdit;
    itemnumber->setMaxLength(10);
 
    QLabel *quantity=new QLabel;
    quantity->setFont(QFont("verdana", 15, QFont::Bold));
    quantity->setText("Quantity");
 
    QLineEdit *quantitynumber=new QLineEdit;
    quantitynumber->setMaxLength(10);
 
    QStringList columnLabels;
    columnLabels << "Item" << "#" << "TOTAL";
 
    QTableWidget *tableWidget=new QTableWidget;
    tableWidget->setRowCount(1);
    tableWidget->setColumnCount(3);
    tableWidget->setHorizontalHeaderLabels(columnLabels);
    tableWidget->setColumnWidth(0, 250);
    tableWidget->setColumnWidth(1, 30);
    tableWidget->setColumnWidth(2, 100);
 
    QHBoxLayout *hLeft1=new QHBoxLayout;
    hLeft1->addWidget(item);
    hLeft1->addWidget(itemnumber);
 
    QHBoxLayout *hLeft2=new QHBoxLayout;
    hLeft1->addWidget(quantity);
    hLeft1->addWidget(quantitynumber);
 
    QVBoxLayout *vLeft=new QVBoxLayout;
    vLeft->addLayout(hLeft1);
    vLeft->addLayout(hLeft2);
 
    QHBoxLayout *hLeft=new QHBoxLayout;
    hLeft->addLayout(vLeft);
    hLeft->addStretch(0);
 
    QVBoxLayout *mainLeft=new QVBoxLayout;
    mainLeft->addWidget(displayItem);
    mainLeft->addStretch(0);
    mainLeft->addLayout(hLeft);
    mainLeft->addStretch(0);
 
    QHBoxLayout *mainBottom=new QHBoxLayout;
    mainBottom->addLayout(mainLeft);
    mainBottom->addWidget(tableWidget);
 
    QVBoxLayout *mainLayout=new QVBoxLayout(this);
    mainLayout->addWidget(title);
    mainLayout->addSpacing(80);
    mainLayout->addLayout(mainBottom);
    setLayout(mainLayout);
 
    itemnumber->setFocus();
    //itemnumber->setText("asdf");
 
    connect(itemnumber, SIGNAL(returnPressed()), this, SIGNAL(processInput()));
 
}
 
void myWidget::processInput(){
    //QString text=itemnumber->text();
    itemnumber->setText("asfd");
}
 
int main(int argc, char *argv[]){
    QApplication app(argc, argv);
    myWidget window;
 
    window.show();
    return app.exec();
}
 
#include "client.moc"

#include<QTableWidgetItem>
#include<QApplication>
#include<QWidget>
#include<QPushButton>
#include<QLabel>
#include<QFont>
#include<QLineEdit>
#include<QTableWidget>
#include<QVBoxLayout>
#include<QHBoxLayout>
#include<QStringList>
#include<QtSql/QSqlDatabase>
#include<QtSql/QSqlQuery>
#include<QString>
#include<QObject>

class myWidget:public QWidget{
    Q_OBJECT

    public:
        myWidget(QWidget *parent=0);

    private slots:
        void processInput();

    private:
        QLabel *displayItem;
        QLineEdit *itemnumber;
};

myWidget::myWidget(QWidget *parent)
    :QWidget(parent)
{
    setWindowState(Qt::WindowFullScreen);

    QLabel *title = new QLabel;
    title->setFont(QFont("Verdana", 30, 0));
    title->setText("title");
    title->setAlignment(Qt::AlignHCenter);

    QLabel *item=new QLabel;
    item->setFont(QFont("verdana", 15, QFont::Bold));
    item->setText("Item");

    displayItem=new QLabel;
    //displayItem->setFont(QFont("verdana", 15, QFont::Bold));
    //displayItem->setText("asdf");

    itemnumber=new QLineEdit;
    itemnumber->setMaxLength(10);

    QLabel *quantity=new QLabel;
    quantity->setFont(QFont("verdana", 15, QFont::Bold));
    quantity->setText("Quantity");

    QLineEdit *quantitynumber=new QLineEdit;
    quantitynumber->setMaxLength(10);

    QStringList columnLabels;
    columnLabels << "Item" << "#" << "TOTAL";

    QTableWidget *tableWidget=new QTableWidget;
    tableWidget->setRowCount(1);
    tableWidget->setColumnCount(3);
    tableWidget->setHorizontalHeaderLabels(columnLabels);
    tableWidget->setColumnWidth(0, 250);
    tableWidget->setColumnWidth(1, 30);
    tableWidget->setColumnWidth(2, 100);

    QHBoxLayout *hLeft1=new QHBoxLayout;
    hLeft1->addWidget(item);
    hLeft1->addWidget(itemnumber);

    QHBoxLayout *hLeft2=new QHBoxLayout;
    hLeft1->addWidget(quantity);
    hLeft1->addWidget(quantitynumber);

    QVBoxLayout *vLeft=new QVBoxLayout;
    vLeft->addLayout(hLeft1);
    vLeft->addLayout(hLeft2);

    QHBoxLayout *hLeft=new QHBoxLayout;
    hLeft->addLayout(vLeft);
    hLeft->addStretch(0);

    QVBoxLayout *mainLeft=new QVBoxLayout;
    mainLeft->addWidget(displayItem);
    mainLeft->addStretch(0);
    mainLeft->addLayout(hLeft);
    mainLeft->addStretch(0);

    QHBoxLayout *mainBottom=new QHBoxLayout;
    mainBottom->addLayout(mainLeft);
    mainBottom->addWidget(tableWidget);

    QVBoxLayout *mainLayout=new QVBoxLayout(this);
    mainLayout->addWidget(title);
    mainLayout->addSpacing(80);
    mainLayout->addLayout(mainBottom);
    setLayout(mainLayout);

    itemnumber->setFocus();
    //itemnumber->setText("asdf");

    connect(itemnumber, SIGNAL(returnPressed()), this, SIGNAL(processInput()));

}

void myWidget::processInput(){
    //QString text=itemnumber->text();
    itemnumber->setText("asfd");
}

int main(int argc, char *argv[]){
    QApplication app(argc, argv);
    myWidget window;

    window.show();
    return app.exec();
}

#include "client.moc"

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everything compiles fine, it just doesnt do the processInput() when i press enter in itemnumber lineedit.

EDIT:
it seems that item number is not emitting the returnPressed() signal because i tried replacing it with

connect(itemnumber, SIGNAL(returnPressed()), qApp, SIGNAL(quit()));

connect(itemnumber, SIGNAL(returnPressed()), qApp, SIGNAL(quit()));

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and when i pressed enter nothing happened.

[jpn]

The latter should be SLOT:

connect(itemnumber, SIGNAL(returnPressed()), this, SLOT(processInput()));

[awnjoor]

and i wonder how did i miss that one ..

thank you