[SOLVED] Insert row from Qtableview to another

advseo32

i have tried to inherif from Qtablewidget and override keypressevent function

i have declared keypressevent function as signal

it works with this condition
@if ( event->key() == Qt::key_Down)@

but when i add more conditions the app crached

her is my code

customtablewidget class @class MonTableauWidget : public QTableWidget
{
Q_OBJECT
public:
explicit MonTableauWidget(QWidget *parent = 0);

signals:
void keyPressEvent(QKeyEvent *event);
public slots:

};
@

the main of classe @#include "montableauwidget.h"

MonTableauWidget::MonTableauWidget(QWidget *parent) :
QTableWidget(parent)
{

}

@

and her is my main where i tried to connect siganl with slot @#include "dialog.h"

Dialog::Dialog(QWidget *parent)
: QWidget(parent)
{
layoutPrincipale = new QVBoxLayout(this);
QPushButton *button = new QPushButton("Clear",this);
tableau = new MonTableauWidget(this);
tableau->setRowCount(1);
tableau->setColumnCount(4) ;
QKeyEvent event(QEvent::KeyPress, Qt::Key_Down, Qt::NoModifier);

QStringList list ;
list << "Désignation" << "Qte" << "Prix/U" << "Total";
tableau->setHorizontalHeaderLabels(list);
layoutPrincipale->addWidget(tableau);
layoutPrincipale->addWidget(button);
setLayout(layoutPrincipale);
connect(tableau,SIGNAL(cellChanged(int,int)),this,SLOT(addrow(int,int))) ;
connect(tableau,SIGNAL(keyPressEvent(QKeyEvent*)),this,SLOT(newRecod(QKeyEvent*)));
connect(button,SIGNAL(clicked()),tableau,SLOT(clear()));

}

Dialog::~Dialog()
{

}

void Dialog::addrow(int row, int col)
{
if(col == 0)
tableau->insertRow(tableau->rowCount());
}
// her is the problem
void Dialog::newRecod(QKeyEvent *record)
{
QModelIndex index = tableau->currentIndex();
int row = index.column();
if(record->key() == Qt::Key_Down)
if(tableau->item(row,0)->text().isEmpty())
QMessageBox::information(this,"Empty Designation","Please Fill in the cell");
else
tableau->insertRow(tableau->rowCount());
}

@

SGaist

keyPressEvent is not a signal, I would advise you to read its "documentation":http://qt-project.org/doc/qt-4.8/qabstractitemview.html#keyPressEvent

From your previous posts, and just to be sure, do you expect me to validate your work ?

advseo32

bq. From your previous posts, and just to be sure, do you expect me to validate your work ?

sorry about that, i'm completely newbie , i have blocked to get a solution for my probelem to complete my first application

advseo32

if i can't use keypressevent() as a signal

how i can handle this event " when the uesr click Key_Down new row added in the bottom "

SGaist

It is explained in the function documentation

advseo32

i still can't know what i do ,

subclass Qtablewidget and implement keypressevent
or use shortcuts .

SGaist

You can also use an event filter to catch that event, this really is up to you to choose the solution that meets your need

advseo32

i have implemented keypressEvent function

and it works perfectly, but when i start to somme conditions the programme crashes

her is my code @void MonTableauWidget::keyPressEvent(QKeyEvent *event)
{
int LastRow = this->rowCount();

switch (event->key()) {
case Qt::Key_Down :
// the problem occured  when i added the line below if(!this->item(LastRow,0)->text().isEmpty())
    this->insertRow(this->rowCount());
    break;
case Qt::Key_Up :
 this->removeRow(1);
    break;
case Qt::Key_0 :

    QMessageBox::information(this,"Row coutn",QString::number( LastRow)) ;
    break;
default:
    QTableWidget::keyPressEvent(event);
    break;
}

}
@

SGaist

@removeRow(1); << What would happen if you don't have a row number 1 ?@

advseo32

i have used the debugger to determine what's the issue
and i think the issue is located her
because when i delete this line every thing works perfectly
@this->item(LastRow,0)->text().isEmpty() ;@

this not refering to the customQtableWidget it's reffering to the
QtableWidgetItem objet

advseo32

[quote author="SGaist" date="1374875944"]@removeRow(1); << What would happen if you don't have a row number 1 ?@[/quote]

nothing is happened , means no row have to removed , but i have correct this issue

@this->removeRow(this->rowCount()-1); @
and this should works , and finally it works

thank's for the hint

advseo32

her is my finall code @void MonTableauWidget::keyPressEvent(QKeyEvent *event)
{
int LastRow = this->rowCount()-1;

// bool ok = this->item(LastRow,0)->text().isEmpty() ;

switch (event->key()) {
case Qt::Key_Down :
    if(LastRow)
        this->insertRow(this->rowCount());
    break;
case Qt::Key_Up :
 this->removeRow(LastRow);
    break;
default:
    QTableWidget::keyPressEvent(event);
    break;
}

@

advseo32

i lost hope to get the solution from my self,

the only problem now is how to test if Cell is Empty

i use this

@this->item(row,col)->text().isEmpty(); @

but the programme crashes , what the probleme her ??

JKSH

[quote author="advseo32" date="1374923562"]
@this->item(row,col)->text().isEmpty(); @

but the programme crashes , what the probleme her ??[/quote]If there is no data in the cell, then this->item() returns NULL.

Your program will crash if you dereference a null pointer.

advseo32

[quote author="JKSH" date="1374928103"][quote author="advseo32" date="1374923562"]
@this->item(row,col)->text().isEmpty(); @

but the programme crashes , what the probleme her ??[/quote]If there is no data in the cell, then this->item() returns NULL.

Your program will crash if you dereference a null pointer.

[/quote]

Yeah! that's true , because QTableWidgetItem was created only when the user fill in the cell

do you have another way to check if the cell if not empty

JKSH

[quote author="advseo32" date="1374942257"]do you have another way to check if the cell if not empty [/quote]If there is no data in the cell, then this->item() returns NULL :)

advseo32

[quote author="JKSH" date="1374942566"][quote author="advseo32" date="1374942257"]do you have another way to check if the cell if not empty [/quote]If there is no data in the cell, then this->item() returns NULL :)[/quote]

Probably , you have give the answer from the the begning , but i haven't pay attention to it

yes it's works
@if (this->item(LastRow,0) != 0)@

advseo32

now

i want to change the behavior of vertical header in Qtableview

this is what i mean:

when user start fill table cells, i want this sign(*) present in vertical header instead of numbers

when user moves beteween rows , i want also this sign(>) present in vertical header instead of numbers

what function i need to implement

SGaist

Did you read the documentation of the various classes you are using ? For example "cellChanged":http://qt-project.org/doc/qt-4.8/qtablewidget.html#cellChanged ?

advseo32

yes i did, but what functions are responsible for doing this

sign(*) present in vertical header instead of numbers

sign(>) present in vertical header instead of numbers