[SOLVED] Insert row from Qtableview to another

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

JKSH

[quote author="SGaist" date="1374952377"]Did you read the documentation of the various classes you are using ?
[quote author="advseo32" date="1374964095"]yes i did, but what functions are responsible for...[/quote][/quote]Please read more thoroughly.

Go to the "documentation":http://qt-project.org/doc/qt-5.1/qtwidgets/qtablewidget.html again and search for "header". Try different functions with good names to see what they do.

advseo32

i have try many functions but no result

Her is my try
this function called when the user start editing cell "CellChanged Signal"
@
void Dialog::newfunction()
{
QModelIndex index ;
index = tableau->model()->index(0,0) ;
tableau->verticalHeader()->model()->setData(index,QPixmap("imgs/arrow.png"),Qt::DecorationRole);
}

@

JKSH

Good on you for trying.
[quote author="advseo32" date="1375041952"]
Her is my try
this function called when the user start editing cell "CellChanged Signal"
@
void Dialog::newfunction()
{
QModelIndex index ;
index = tableau->model()->index(0,0) ;
tableau->verticalHeader()->model()->setData(index,QPixmap("imgs/arrow.png"),Qt::DecorationRole);
}

@
[/quote]There are two major issues:

If you haven't set any header data, tableau->verticalHeader()->model() returns NULL

You have 2 models here. tableau->model() is the table model, tableau->verticalHeader()->model() is the header model. You created an index for the table model, so you can't use that index to set data in the header model.

Hint: If you use setHeaderData(), you don't need an index