How to access an object inside a privateslot

**graciano** · 20th January 2009, 18:44

Hi!
I want to use the QStringList *listaMatriculasValidas inside the "void IdDoAutomovelDialog:

n_lineEdit_textChanged()" private slot, where the connection is made automatically by the setupUi()!
How can i access it where "x marks the spot"

Here is the code:

Qt Code:

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#include <QtGui>
 
#include "IdDoAutomovelDialog.h"
 
IdDoAutomovelDialog:: IdDoAutomovelDialog(QWidget *parent) : QDialog(parent){
    setupUi(this);
 
    //Validar a matrÃ*cula introduzida ( http://pt.wikipedia.org/wiki/Matr%C3%ADculas_autom%C3%B3veis_em_Portugal )
    QStringList *listaMatriculasValidas = new QStringList;
    listaMatriculasValidas->operator <<("[A-Za-z]{2,2}-[0-9]{2,2}-[0-9]{2,2}");
    listaMatriculasValidas->operator <<("[0-9]{2,2}-[0-9]{2,2}-[A-Za-z]{2,2}");
    listaMatriculasValidas->operator <<("[0-9]{2,2}-[A-Za-z]{2,2}-[0-9]{2,2}");
    QRegExp regExp(listaMatriculasValidas->join("|"));
    lineEdit->setValidator(new QRegExpValidator(regExp, this));
 
    //Definir acÃ§Ãµes
    connect(okButton, SIGNAL(clicked()), this, SLOT(accept()));
    connect(cancelButton, SIGNAL(clicked()), this, SLOT(reject()));
}
 
void IdDoAutomovelDialog::on_lineEdit_textChanged(){
    okButton->setEnabled(lineEdit->hasAcceptableInput());
 
    ////////////////////////////
    //                        //
    //    X marks the spot
    //                        //
    ////////////////////////////
 
    //Limpar chapa
    labelDescSerie->setText("?");
 
    //Verificar qual a sÃ©rie de matrÃ*cula
    QLineEdit newlineEdit;
    newlineEdit.setText(lineEdit->text());
 
    QRegExp serie;
    serie.setPattern("[A-Za-z]{2,2}-[0-9]{2,2}-[0-9]{2,2}");
    QRegExpValidator validator(serie,this);
 
    //Chapa de modelo anterior a 1992
    newlineEdit.setValidator(&validator);
    if(newlineEdit.hasAcceptableInput())
        labelDescSerie->setText("Chapa de modelo anterior a 1992");
 
    //Chapa de modelo utilizado entre 1992 e 2005
    serie.setPattern("[0-9]{2,2}-[0-9]{2,2}-[A-Za-z]{2,2}");
    validator.setRegExp(serie);
    if(newlineEdit.hasAcceptableInput())
        labelDescSerie->setText("Chapa de modelo utilizado entre 1992 e 2005");
 
    //Chapa de modelo posterior a 2005
    serie.setPattern("[0-9]{2,2}-[A-Za-z]{2,2}-[0-9]{2,2}");
    validator.setRegExp(serie);
    if(newlineEdit.hasAcceptableInput())
        labelDescSerie->setText("Chapa de modelo posterior a 2005");
}

#include <QtGui>

#include "IdDoAutomovelDialog.h"

IdDoAutomovelDialog:: IdDoAutomovelDialog(QWidget *parent) : QDialog(parent){
    setupUi(this);

    //Validar a matrÃ*cula introduzida ( http://pt.wikipedia.org/wiki/Matr%C3%ADculas_autom%C3%B3veis_em_Portugal )
    QStringList *listaMatriculasValidas = new QStringList;
    listaMatriculasValidas->operator <<("[A-Za-z]{2,2}-[0-9]{2,2}-[0-9]{2,2}");
    listaMatriculasValidas->operator <<("[0-9]{2,2}-[0-9]{2,2}-[A-Za-z]{2,2}");
    listaMatriculasValidas->operator <<("[0-9]{2,2}-[A-Za-z]{2,2}-[0-9]{2,2}");
    QRegExp regExp(listaMatriculasValidas->join("|"));
    lineEdit->setValidator(new QRegExpValidator(regExp, this));

    //Definir acÃ§Ãµes
    connect(okButton, SIGNAL(clicked()), this, SLOT(accept()));
    connect(cancelButton, SIGNAL(clicked()), this, SLOT(reject()));
}

void IdDoAutomovelDialog::on_lineEdit_textChanged(){
    okButton->setEnabled(lineEdit->hasAcceptableInput());

    ////////////////////////////
    //                        //
    //    X marks the spot
    //                        //
    ////////////////////////////

    //Limpar chapa
    labelDescSerie->setText("?");

    //Verificar qual a sÃ©rie de matrÃ*cula
    QLineEdit newlineEdit;
    newlineEdit.setText(lineEdit->text());

    QRegExp serie;
    serie.setPattern("[A-Za-z]{2,2}-[0-9]{2,2}-[0-9]{2,2}");
    QRegExpValidator validator(serie,this);

    //Chapa de modelo anterior a 1992
    newlineEdit.setValidator(&validator);
    if(newlineEdit.hasAcceptableInput())
        labelDescSerie->setText("Chapa de modelo anterior a 1992");

    //Chapa de modelo utilizado entre 1992 e 2005
    serie.setPattern("[0-9]{2,2}-[0-9]{2,2}-[A-Za-z]{2,2}");
    validator.setRegExp(serie);
    if(newlineEdit.hasAcceptableInput())
        labelDescSerie->setText("Chapa de modelo utilizado entre 1992 e 2005");

    //Chapa de modelo posterior a 2005
    serie.setPattern("[0-9]{2,2}-[A-Za-z]{2,2}-[0-9]{2,2}");
    validator.setRegExp(serie);
    if(newlineEdit.hasAcceptableInput())
        labelDescSerie->setText("Chapa de modelo posterior a 2005");
}

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The idea is not to repeat the strings and the use Iteration to optimize the code.
Thanks

**jpn** · 20th January 2009, 19:15

Basic C++ question, make it a member variable.

PS. And there is no need to allocate the string list on the heap.

**graciano** · 20th January 2009, 19:39

arrrg ...

Thanks

**graciano** · 20th January 2009, 22:40

This is more what i had in mind but now i need to ask a final question.
In line 39 i used the int 1 (one) just to test it.
Is there a way to return the index position in the string list (an integer) to use in there?

Qt Code:

Switch view

#include <QtGui>
 
#include "IdDoAutomovelDialog.h"
 
IdDoAutomovelDialog::IdDoAutomovelDialog(QWidget *parent) : QDialog(parent){
    setupUi(this);
 
    //Validar a matrÃ*cula introduzida ( http://pt.wikipedia.org/wiki/Matr%C3%ADculas_autom%C3%B3veis_em_Portugal )
    listaMatriculasValidas << "[A-Za-z]{2,2}-[0-9]{2,2}-[0-9]{2,2}";
    listaMatriculasValidas << "[0-9]{2,2}-[0-9]{2,2}-[A-Za-z]{2,2}";
    listaMatriculasValidas << "[0-9]{2,2}-[A-Za-z]{2,2}-[0-9]{2,2}";
    QRegExp regExp(listaMatriculasValidas.join("|"));
    lineEdit->setValidator(new QRegExpValidator(regExp, this));
 
    //Definir acÃ§Ãµes
    connect(okButton, SIGNAL(clicked()), this, SLOT(accept()));
    connect(cancelButton, SIGNAL(clicked()), this, SLOT(reject()));
}
 
void IdDoAutomovelDialog::on_lineEdit_textChanged(){
    okButton->setEnabled(lineEdit->hasAcceptableInput());
 
    //Limpar chapa
    labelDescSerie->setText("?");
 
    //Verificar qual a sÃ©rie de matrÃ*cula
    QLineEdit newlineEdit;
    newlineEdit.setText(lineEdit->text());
 
    QRegExp serie;
    serie.setPattern("");
    QRegExpValidator validator(serie,this);
    newlineEdit.setValidator(&validator);
    for ( QStringList::Iterator it = listaMatriculasValidas.begin(); it != listaMatriculasValidas.end();++it ){
        serie.setPattern(*it);
        //serie.setPattern("[0-9]{2,2}-[A-Za-z]{2,2}-[0-9]{2,2}");
        validator.setRegExp(serie);
        if(newlineEdit.hasAcceptableInput())
            switch(1){
                case 1: labelDescSerie->setText("Chapa de modelo anterior a 1992");
                        break;
                case 2: labelDescSerie->setText("Chapa de modelo utilizado entre 1992 e 2005");
                        break;
                case 3: labelDescSerie->setText("Chapa de modelo posterior a 2005");
                        break;
                default:labelDescSerie->setText("???");
            }
    }
}

#include <QtGui>

#include "IdDoAutomovelDialog.h"

IdDoAutomovelDialog::IdDoAutomovelDialog(QWidget *parent) : QDialog(parent){
    setupUi(this);

    //Validar a matrÃ*cula introduzida ( http://pt.wikipedia.org/wiki/Matr%C3%ADculas_autom%C3%B3veis_em_Portugal )
    listaMatriculasValidas << "[A-Za-z]{2,2}-[0-9]{2,2}-[0-9]{2,2}";
    listaMatriculasValidas << "[0-9]{2,2}-[0-9]{2,2}-[A-Za-z]{2,2}";
    listaMatriculasValidas << "[0-9]{2,2}-[A-Za-z]{2,2}-[0-9]{2,2}";
    QRegExp regExp(listaMatriculasValidas.join("|"));
    lineEdit->setValidator(new QRegExpValidator(regExp, this));

    //Definir acÃ§Ãµes
    connect(okButton, SIGNAL(clicked()), this, SLOT(accept()));
    connect(cancelButton, SIGNAL(clicked()), this, SLOT(reject()));
}

void IdDoAutomovelDialog::on_lineEdit_textChanged(){
    okButton->setEnabled(lineEdit->hasAcceptableInput());

    //Limpar chapa
    labelDescSerie->setText("?");

    //Verificar qual a sÃ©rie de matrÃ*cula
    QLineEdit newlineEdit;
    newlineEdit.setText(lineEdit->text());

    QRegExp serie;
    serie.setPattern("");
    QRegExpValidator validator(serie,this);
    newlineEdit.setValidator(&validator);
    for ( QStringList::Iterator it = listaMatriculasValidas.begin(); it != listaMatriculasValidas.end();++it ){
        serie.setPattern(*it);
        //serie.setPattern("[0-9]{2,2}-[A-Za-z]{2,2}-[0-9]{2,2}");
        validator.setRegExp(serie);
        if(newlineEdit.hasAcceptableInput())
            switch(1){
                case 1: labelDescSerie->setText("Chapa de modelo anterior a 1992");
                        break;
                case 2: labelDescSerie->setText("Chapa de modelo utilizado entre 1992 e 2005");
                        break;
                case 3: labelDescSerie->setText("Chapa de modelo posterior a 2005");
                        break;
                default:labelDescSerie->setText("???");
            }
    }
}

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Thanks

**graciano** · 21st January 2009, 10:40

ufff ... solved it like this:

Qt Code:

Switch view

void IdDoAutomovelDialog::on_lineEdit_textChanged(){
    okButton->setEnabled(lineEdit->hasAcceptableInput());
 
    //Limpar chapa
    labelDescSerie->setText("?");
 
    //Verificar qual a sÃ©rie de matrÃ*cula
    QLineEdit newlineEdit;
    newlineEdit.setText(lineEdit->text());
 
    QRegExp serie;
    serie.setPattern("");
    QRegExpValidator validator(serie,this);
    newlineEdit.setValidator(&validator);
    for ( QStringList::Iterator it = listaMatriculasValidas.begin(); it != listaMatriculasValidas.end();++it ){
        serie.setPattern(*it);
        validator.setRegExp(serie);
        if(newlineEdit.hasAcceptableInput()){
            switch(listaMatriculasValidas.indexOf(serie.pattern(),0)+1){
                case 1: labelDescSerie->setText("Chapa de modelo anterior a 1992");
                        break;
                case 2: labelDescSerie->setText("Chapa de modelo utilizado entre 1992 e 2005");
                        break;
                case 3: labelDescSerie->setText("Chapa de modelo posterior a 2005");
                        break;
                default:labelDescSerie->setNum(listaMatriculasValidas.indexOf(serie.pattern(),0));
            }
        }
    }
}

void IdDoAutomovelDialog::on_lineEdit_textChanged(){
    okButton->setEnabled(lineEdit->hasAcceptableInput());

    //Limpar chapa
    labelDescSerie->setText("?");

    //Verificar qual a sÃ©rie de matrÃ*cula
    QLineEdit newlineEdit;
    newlineEdit.setText(lineEdit->text());

    QRegExp serie;
    serie.setPattern("");
    QRegExpValidator validator(serie,this);
    newlineEdit.setValidator(&validator);
    for ( QStringList::Iterator it = listaMatriculasValidas.begin(); it != listaMatriculasValidas.end();++it ){
        serie.setPattern(*it);
        validator.setRegExp(serie);
        if(newlineEdit.hasAcceptableInput()){
            switch(listaMatriculasValidas.indexOf(serie.pattern(),0)+1){
                case 1: labelDescSerie->setText("Chapa de modelo anterior a 1992");
                        break;
                case 2: labelDescSerie->setText("Chapa de modelo utilizado entre 1992 e 2005");
                        break;
                case 3: labelDescSerie->setText("Chapa de modelo posterior a 2005");
                        break;
                default:labelDescSerie->setNum(listaMatriculasValidas.indexOf(serie.pattern(),0));
            }
        }
    }
}

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**lyuts** · 21st January 2009, 11:08

Make it an input parameter of your slot. Then do your switch(ipIndex).

**jpn** · 21st January 2009, 13:26

Something I don't get is that a slot connected to QLineEdit::textChanged() creates another QLineEdit every time the text of the former line edit changes.

**graciano** · 21st January 2009, 18:09

The original QLineEdit contains something like:
"egexp1"<<"|"<<""regexp"<<"|"<<"egexp3"<<...<<"reg expn"
This way i can validade entries that satisfy regexp1 or regexp2 or ....

Inside the slot the newLineEdit is used to validate a specific regexp(i) so that i can use it to obtain an index in the string list.

Perhaps it is not the cleanest aproach but it is working.

If you want to take a look and comment it i would apreciate:

http://www.box.net/shared/fpq98hvito

Still trying to think Qt