QTableWidget

[dragon]

Hello anyone,

I ám using fc6 with Qt-4.2
I have a Dialog with a freesTable widget with 1 collum.
I can add a row through a another Dialog into freesTable no problem.
I want to hold the row in a QList<> and when i startup the application it will iterate first
through the QList and place the row in my freesTable.
But there is nothing showing up in freesTable.
Can anybody help me with this problem.

The header file frees.h

#include <QtGui>
#include "ui_freesdialog.h"
 
class freesDialog : public QDialog, public Ui::freesDialog
{	
	Q_OBJECT 
 
	public:
	freesDialog(QList<QString> *list, QWidget *parent=0);
 
public slots:
	void add();
 
private slots:
        void done(int result);
 
private:
        QList<QString> list;
 
};

#include <QtGui>
#include "ui_freesdialog.h"

class freesDialog : public QDialog, public Ui::freesDialog
{	
	Q_OBJECT 

	public:
	freesDialog(QList<QString> *list, QWidget *parent=0);

public slots:
	void add();

private slots:
        void done(int result);
        
private:
        QList<QString> list;
        
};

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The implentation file frees.cpp

#include <QtCore>
 
#include "frees.h"
#include "frezen.h"
 
freesDialog::freesDialog(QList<QString> *list, QWidget *parent)   
  :QDialog(parent)
 
{	
	setupUi(this);
 
	for(int row = 0; row < list->count(); ++row) {
        QString frees = list->at(row);                                  
        freesTable->setItem(row, 0, new QTableWidgetItem(frees));       //Something is wrong here.
}
	connect(pbAdd, SIGNAL(clicked()), this, SLOT(add()));
	connect(pbRemove, SIGNAL(clicked()), this, SLOT(remove()));
}
 
 
void freesDialog::add()
 
{
	frezenDialog dlg(this);
	if( dlg.exec() == QDialog::Accepted )   {
 
       QString materiaal = dlg.matComboBox->currentText();
       int row = freesTable->rowCount();
       freesTable->insertRow(row);
       freesTable->setItem(row, 0, new QTableWidgetItem(materiaal));
                             }
}
 
 
void freesDialog::done(int result)
{
 
     if(result == QDialog::Accepted)  {
      for(int row = 0; row < freesTable->rowCount(); ++row) {
              QString materiaal = freesTable->item(row, 0)->text();
              list.append(QString(materiaal)); // Give a error Undefined reference to Frezen::Frezen(QString const&)
              }  
          }
          QDialog::done(result);
}

#include <QtCore>

#include "frees.h"
#include "frezen.h"

freesDialog::freesDialog(QList<QString> *list, QWidget *parent)   
  :QDialog(parent)

{	
	setupUi(this);
	
	for(int row = 0; row < list->count(); ++row) {
        QString frees = list->at(row);                                  
        freesTable->setItem(row, 0, new QTableWidgetItem(frees));       //Something is wrong here.
}
	connect(pbAdd, SIGNAL(clicked()), this, SLOT(add()));
	connect(pbRemove, SIGNAL(clicked()), this, SLOT(remove()));
}
    

void freesDialog::add()

{
	frezenDialog dlg(this);
	if( dlg.exec() == QDialog::Accepted )   {

       QString materiaal = dlg.matComboBox->currentText();
       int row = freesTable->rowCount();
       freesTable->insertRow(row);
       freesTable->setItem(row, 0, new QTableWidgetItem(materiaal));
                             }
}


void freesDialog::done(int result)
{

     if(result == QDialog::Accepted)  {
      for(int row = 0; row < freesTable->rowCount(); ++row) {
              QString materiaal = freesTable->item(row, 0)->text();
              list.append(QString(materiaal)); // Give a error Undefined reference to Frezen::Frezen(QString const&)
              }  
          }
          QDialog::done(result);
}

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The main file main.cpp

#include <QApplication>
#include "frees.h"
 
int main(int argc, char *argv[])
 
{
    QApplication app(argc, argv); 
    QList<Frezen> list;
    freesDialog freesdlg(&list);
    return freesdlg.exec();
}

#include <QApplication>
#include "frees.h"

int main(int argc, char *argv[])

{
    QApplication app(argc, argv); 
    QList<Frezen> list;
    freesDialog freesdlg(&list);
    return freesdlg.exec();
}

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Thanks in advance.

[jpn]

Maybe you forgot to set the column count? See QTableWidget::setColumnCount() or do it via designer.

[marcel]

Actually its more likely you forgot setRowCount()...

[dragon]

I have set the collumcount in QT Designer i think tht is not the problem.
I think the problem sits in the frees.cpp in the line's.

#
for(int row = 0; row < list->count(); ++row) {
#
QString frees = list->at(row);
#
freesTable->setItem(row, 0, new QTableWidgetItem(frees)); //Something is wrong here.
#
}

and in the line's
#
for(int row = 0; row < freesTable->rowCount(); ++row) {
#
QString materiaal = freesTable->item(row, 0)->text();
#
list.append(QString(materiaal)); // Give a error Undefined reference to Frezen::Frezen(QString const&)

[marcel]

Where do you populate the list you pass in main.cpp to the dialog? Ibelieve there is no problem, its just the list... It is empty...

[dragon]

I populate the list in frees.cpp

void freesDialog::done(int result)
{
 
     if(result == QDialog::Accepted)  {
      for(int row = 0; row < freesTable->rowCount(); ++row) {
              QString materiaal = freesTable->item(row, 0)->text();
              list.append(QString(materiaal)); // Give a error Undefined reference to Frezen::Frezen(QString const&)
              }  
          }
          QDialog::done(result);
}

void freesDialog::done(int result)
{

     if(result == QDialog::Accepted)  {
      for(int row = 0; row < freesTable->rowCount(); ++row) {
              QString materiaal = freesTable->item(row, 0)->text();
              list.append(QString(materiaal)); // Give a error Undefined reference to Frezen::Frezen(QString const&)
              }  
          }
          QDialog::done(result);
}

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When compiling he give's a error on line
list.append(QString(materiaal));
I think there some wrong in the code on this line.

[marcel]

I don't understand something: in main.cpp you create the dialog by passing a QList to it.
In the constructor of the dialog you fill a table from this list ( WHICH IS EMPTY AT THE MOMENT !!! ). What do you expect to see? Or, is this the correct code? Maybe I'm missing something.

[dragon]

Maybe i must change the main.cpp because the code is not right.

#include <QApplication>
#include "frees.h"
 
int main(int argc, char *argv[])
 
{
    QApplication app(argc, argv); 
    QList<Frezen> list;
    freesDialog freesdlg(&list);
    return freesdlg.exec();
}

#include <QApplication>
#include "frees.h"

int main(int argc, char *argv[])

{
    QApplication app(argc, argv); 
    QList<Frezen> list;
    freesDialog freesdlg(&list);
    return freesdlg.exec();
}

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I will delete the line
QList<Frezen> list;
Mabye that will solve the problem.

[dragon]

I have delete the line QLIst<Frezen> list.

#include <QApplication>
#include "frees.h"
 
int main(int argc, char *argv[])
 
{
    QApplication app(argc, argv); 
    freesDialog freesdlg;
    return freesdlg.exec();
}

#include <QApplication>
#include "frees.h"

int main(int argc, char *argv[])

{
    QApplication app(argc, argv); 
    freesDialog freesdlg;
    return freesdlg.exec();
}

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When i compile the application it give's a error.
main.cpp error: no matching function for call to freesDialog::freesDialog().

[marcel]

because freesDialog does not have a default constructor ( a constructor with no parameters ).

From what I've seen the constructor of freesDialog has two parameters: a QList and a QWidget.

You should modify the constructor or create it accordingly in main.cpp.

Regards.

[dragon]

Can you give me a example over modify the constructor

[marcel]

Sure...

In the header:

public:
   freesDialog( QWidget* parent = NULL );
...

public:
   freesDialog( QWidget* parent = NULL );
...

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In the cpp:

freesDialog::freesDialog( QWidget* parent )
:QDialog( parent )
{
   ... do some stuff
}

freesDialog::freesDialog( QWidget* parent )
:QDialog( parent )
{
   ... do some stuff
}

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Now, when you create the dialog, you can call the constructor without any parameters.
Also, there is no point in filling the table from that empty list in the constructor... So you can remove it...


Regards

[dragon]

It is not working the Qlist stays empty i think.
Nothing showing up in QTableWidget.
I try to search for orther sollution.

Thanks Marcel for your time and suggestions.

[marcel]

Definitely you're doing something wrong there... What is in the list and where the list gets populated? I mean, where do you put items in the list?

Before filling the table from the list, there has to be actually something in the list in the first place....

Regards.

[dragon]

I know something wrong there...

I get my items from this with some comment on the line's maybe helps.

void freesDialog::add()
 
{
    frezenDialog dlg(this);  // When  i clicked on de pushbutton it shows this inputdialog.
    if( dlg.exec() == QDialog::Accepted )   {
 
    QString materiaal = dlg.matComboBox->currentText();  // the text i choose in my matComboBox
    int row = freesTable->rowCount();
    freesTable->insertRow(row);
    freesTable->setItem(row, 0, new QTableWidgetItem(materiaal)); //Put the text onto the QTableWidget.
 
                             }	
}

void freesDialog::add()

{
    frezenDialog dlg(this);  // When  i clicked on de pushbutton it shows this inputdialog.
    if( dlg.exec() == QDialog::Accepted )   {

    QString materiaal = dlg.matComboBox->currentText();  // the text i choose in my matComboBox
    int row = freesTable->rowCount();
    freesTable->insertRow(row);
    freesTable->setItem(row, 0, new QTableWidgetItem(materiaal)); //Put the text onto the QTableWidget.
	
                             }	
}

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From another function
void freesDialog::done(int result)

QString materiaal = freesTable->item(row, 0)->text();            
              list.append(materiaal);    //materiaal must append to QList<Qstring> list

QString materiaal = freesTable->item(row, 0)->text();            
              list.append(materiaal);    //materiaal must append to QList<Qstring> list

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I think this the method to put something in list maby i wrong.