How to update parents QTableView

Panoss

I have a form QMainWindow, this is the parent.
It opens the child which has a QTableView ('positionsTable').
After the positionsTable is updated I want parent's data (displayed in a QTableView also) to be updated,
So I did it like this (code is in the child, parentmodel is passed in the consrtructor, where connection also happens with updateParent):

positionsForm::positionsForm(QSqlRelationalTableModel *parentmodel, QWidget *parent) :
    QDialog(parent),
    ui(new Ui::positionsForm)

    connect(ui->positionsTable->model(),
            SIGNAL(dataChanged(QModelIndex,QModelIndex)), this,
            SLOT(updateParent(parentmodel)));

And the updateParent code:

void positionsForm::updateParent(QSqlRelationalTableModel *parentmodel){    
    parentmodel->select();   
}

The updateParent is called, but the parent table view is not updated.
How can I do it?

Christian Ehrlicher

@Panoss said in How to update parents QTableView:

SLOT(updateParent(parentmodel)));

How should this work?

QObject::connect() returns false, fix your slot. You should use the new signal/slot syntax for this.

Panoss

It says:

New: connecting to simple function

The new syntax can even connect to functions, not just QObjects:

connect(
    sender, &Sender::valueChanged,
    someFunction
);

I don't know how to fix the slot, I don't understand, I have connected to some function.

Christian Ehrlicher

Then use the old signal/slot syntax, save parentmodel as member and use it in the connected slot.

Panoss

I did it this way:

connect(ui->positionsTable->model(), &QSqlRelationalTableModel::dataChanged,
              this, positionsForm::updateParent(parentmodel));

I get this error:

positionsform.cpp:50:5: error: no matching member function for call to 'connect'
qobject.h:197:36: note: candidate function not viable: no known conversion from 'void (QAbstractItemModel::*)(const QModelIndex &, const QModelIndex &, const QList<int> &)' to 'const char *' for 2nd argument
qobject.h:200:36: note: candidate function not viable: no known conversion from 'void (QAbstractItemModel::*)(const QModelIndex &, const QModelIndex &, const QList<int> &)' to 'const QMetaMethod' for 2nd argument
qobject.h:443:41: note: candidate function not viable: no known conversion from 'void (QAbstractItemModel::*)(const QModelIndex &, const QModelIndex &, const QList<int> &)' to 'const char *' for 2nd argument
qobject.h:217:43: note: candidate template ignored: substitution failure [with Func1 = void (QAbstractItemModel::*)(const QModelIndex &, const QModelIndex &, const QList<int> &), Func2 = void]: no type named 'Object' in 'QtPrivate::FunctionPointer<void>'
qobject.h:258:13: note: candidate template ignored: requirement 'int(QtPrivate::FunctionPointer<void>::ArgumentCount) >= 0 && !QtPrivate::FunctionPointer<void>::IsPointerToMemberFunction' was not satisfied [with Func1 = void (QAbstractItemModel::*)(const QModelIndex &, const QModelIndex &, const QList<int> &), Func2 = void]
qobject.h:297:13: note: candidate template ignored: substitution failure [with Func1 = void (QAbstractItemModel::*)(const QModelIndex &, const QModelIndex &, const QList<int> &), Func2 = void]: argument may not have 'void' type
qobject.h:249:13: note: candidate function template not viable: requires 3 arguments, but 4 were provided
qobject.h:289:13: note: candidate function template not viable: requires 3 arguments, but 4 were provided

Christian Ehrlicher

@Panoss said in How to update parents QTableView:

positionsForm::updateParent(parentmodel))

Again: you can't pass a parameter in your slot this way - a slot can only take the parameters coming from a signal.

Then use the old signal/slot syntax, save parentmodel as member and use it in the connected slot.

Panoss

Ok it works!
In the constructor:

positionsForm::positionsForm(QSqlRelationalTableModel *parentmodel, QWidget *parent) :
    QDialog(parent),
    ui(new Ui::positionsForm)

    this->parentmodel = parentmodel;

    connect(ui->positionsTable->model(),
            SIGNAL(dataChanged(QModelIndex,QModelIndex)), this,
            SLOT(updateParent()));

And the function:

void positionsForm::updateParent(){
    qDebug() << "updateParent called!!";
    this->parentmodel->select();
}