subclass QLineEdit to have an index

[ReshmaRatan]

No, I actually don't need to store them. I will try to explain more clearly how I want this to work. I create a column of 1650 rows that consist of a QLineEdit(call it MyLineEdit(item#)) and 2 or 3 Labels (item#, description, price) the lineedit and labels are indexed with the same number. The salesperson while making an order scrolls down the column and at each item in the order places a number(quantity) in the LineEdit. When the order is complete, the text of the LineEdit and the labels is placed in the invoice and saved in a database and the text is cleared from all of the LineEdits to be ready for the next order. The LineEdits exist on the screen until the application is closed, the text is only there until it is saved in the database. If in the future, someone needs to look at the order, a query is run using the OrderID and the order is recreated placing the quantity of each item in the order in the LineEdits using MyLineEdit(item#).setText(). The LineEdits are created at the beginning of the application and destroyed when it closes, I don't need to store them anywhere. When the order is created, I can use the textChanged signal to store the information and probably don't actually need the item# index, but when the order is recreated being able to use MyLineEdit(item#).setText() is much better than the way it was done in the original application. I hope that this helps to clear thing up. I really appreciate your help with this. Thanks

Hello,

This is my first post in this forum. So please don't mind if any mistakes.
Coming to the problem, as per my understanding in a short way, you have many rows and each row has a line edit where user can enter some value. At last u have to get all the values from all the line edits. And those line edits are dynamically created in a for loop.

I have worked on the similar scenario where i have some buttons which are dynamically created in a for loop and i need to understand on fly which button is triggered.

For this i have used QSignalMapper concept. Below is the sample code.

//Code Begins
QSignalMapper *m_btnSigMapper; //its a class variable
for(int nIndex = 0; nIndex < 10; nIndex++)
{
//create buttons
QPushButton *btn = new QPushButton();
//set the properties as required.
connect(btn , SIGNAL(clicked()), m_btnSigMapper, SLOT(map()));
//now create unique name for your widget
QString szMapName = QString::number(nIndex);
m_btnSigMapper->setMapping(btn , szMapName);
}
//now this is important connect
//Here we connect to our slot whenever a button is clicked.
connect(m_btnSigMapper, SIGNAL(mapped(const QString &)), this, SLOT(slotBtnClicked(const QString &)));
 
//slotBtnClicked function
void slotBtnClicked(QString szMapName)
{
//do the functionality based on the map name because it is unique.
}
 
////// A sample code for your problem statement can be like below.
 
QSignalMapper *m_lineEditSigMapper; //its a class variable
for(int nIndex = 0; nIndex < 10; nIndex++)
{
//create line edits
QLineEdit *lineEdit = new QLineEdit();
 
//now set a name to your line edit.
lineEdit.setObjectName(QString("LineEdit").append(QString::number(nIndex)));
 
//set the properties as required.
 
//Connect textEdited signal.
connect(lineEdit , SIGNAL(textEdited(const QString &)), m_lineEditSigMapper, SLOT(map()));
 
m_lineEditSigMapper->setMapping(lineEdit , lineEdit);
}
//now this is important connect
//Here we connect to our slot whenever a text is edited in your line edits.
connect(m_lineEditSigMapper, SIGNAL(mapped(QWidget*)), this, SLOT(slotLineEditTextEdited(QWidget*)));
 
//Create a variable which stores the values from LineEdits.
QMap<QString,QString> m_lineEditValues; //class variable
//slotLineEditTextEdited function
void slotLineEditTextEdited(QWidget* widget)
{
QLineEdit *lineEdit = reinterpret_cast<QLineEdit*> (widget);
m_lineEditValues.insert(lineEdit.objectName(),lineEdit.text()); 
}

//Code Begins
QSignalMapper *m_btnSigMapper; //its a class variable
for(int nIndex = 0; nIndex < 10; nIndex++)
{
//create buttons
QPushButton *btn = new QPushButton();
//set the properties as required.
connect(btn , SIGNAL(clicked()), m_btnSigMapper, SLOT(map()));
//now create unique name for your widget
QString szMapName = QString::number(nIndex);
m_btnSigMapper->setMapping(btn , szMapName);
}
//now this is important connect
//Here we connect to our slot whenever a button is clicked.
connect(m_btnSigMapper, SIGNAL(mapped(const QString &)), this, SLOT(slotBtnClicked(const QString &)));

//slotBtnClicked function
void slotBtnClicked(QString szMapName)
{
//do the functionality based on the map name because it is unique.
}

////// A sample code for your problem statement can be like below.

QSignalMapper *m_lineEditSigMapper; //its a class variable
for(int nIndex = 0; nIndex < 10; nIndex++)
{
//create line edits
QLineEdit *lineEdit = new QLineEdit();

//now set a name to your line edit.
lineEdit.setObjectName(QString("LineEdit").append(QString::number(nIndex)));

//set the properties as required.

//Connect textEdited signal.
connect(lineEdit , SIGNAL(textEdited(const QString &)), m_lineEditSigMapper, SLOT(map()));

m_lineEditSigMapper->setMapping(lineEdit , lineEdit);
}
//now this is important connect
//Here we connect to our slot whenever a text is edited in your line edits.
connect(m_lineEditSigMapper, SIGNAL(mapped(QWidget*)), this, SLOT(slotLineEditTextEdited(QWidget*)));

//Create a variable which stores the values from LineEdits.
QMap<QString,QString> m_lineEditValues; //class variable
//slotLineEditTextEdited function
void slotLineEditTextEdited(QWidget* widget)
{
QLineEdit *lineEdit = reinterpret_cast<QLineEdit*> (widget);
m_lineEditValues.insert(lineEdit.objectName(),lineEdit.text()); 
}

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Cheers...