Subclassed qlistwidget event handling problem

[Annihilator]

I subclassed qlistwidget
class CustomListWidget : public QListWidget
{
Q_OBJECT
public:
explicit CustomListWidget(QWidget *parent = 0);
signals:
public slots:
public:
int currentItemIndex;
QListWidgetItem *currentItem;
protected:
void currentItemChanged ( QListWidgetItem * current, QListWidgetItem * previous );
void itemPressed ( QListWidgetItem * item );
void paintEvent(QPaintEvent *pe);
void currentRowChanged(int currentRow);
void keyPressEvent(QKeyEvent *event);
void mouseMoveEvent(QMouseEvent *event);
};
Add 3 items into one (3 strings)

wrote event handlers:
void CustomListWidget::currentItemChanged ( QListWidgetItem * current, QListWidgetItem * previous )
{
}
void CustomListWidget::currentRowChanged(int currentRow)
{
}
void CustomListWidget::itemPressed ( QListWidgetItem * item )
{
}
void CustomListWidget::paintEvent(QPaintEvent *pe)
{
}
void CustomListWidget::keyPressEvent(QKeyEvent *ev)
{
}
void CustomListWidget::mouseMoveEvent(QMouseEvent *ev)
{
}
Handlers for mouseMoveEvent, keyPressEvent and paintEvent work but for itemPressed, currentRowChanged, currentItemChanged do not. What`s the problem?

[Lykurg]

Handlers for mouseMoveEvent, keyPressEvent and paintEvent work but for itemPressed, currentRowChanged, currentItemChanged do not. What`s the problem?

It's because they are signals and not event handlers! Use QObject::connect() to connect them to a local slot.

[Annihilator]

I`ve made

connect(this, SIGNAL(itemPressed( QListWidgetItem * item )), SLOT(itemPressed_s ( QListWidgetItem * item )));

connect(this, SIGNAL(itemPressed( QListWidgetItem * item )), SLOT(itemPressed_s ( QListWidgetItem * item )));

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defined slot in header file of mywidget

void itemPressed_s ( QListWidgetItem * item );

void itemPressed_s ( QListWidgetItem * item );

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but still does not work

[Lykurg]

where is the connect statement and please can you show us your full header file. Have you also recompiled your project, used the Q_OBJECT makro...

Your syntax is fine, so it normally should work.

[Annihilator]

class CustomListWidget : public QListWidget
{
Q_OBJECT
public:
    explicit CustomListWidget(QWidget *parent = 0);
 
signals:
 
//void currentItemChanged ( QListWidgetItem * current, QListWidgetItem * previous );
//void itemPressed ( QListWidgetItem * item );
public slots:
void itemPressed_s ( QListWidgetItem * item );
void currentItemChanged_s ( QListWidgetItem * current, QListWidgetItem * previous );
public:
    int currentItemIndex;
    QListWidgetItem *currentItem;
 
protected:
	void paintEvent(QPaintEvent *pe);
	void keyPressEvent(QKeyEvent *event);
	void mouseMoveEvent(QMouseEvent *event);
};

class CustomListWidget : public QListWidget
{
Q_OBJECT
public:
    explicit CustomListWidget(QWidget *parent = 0);

signals:

//void currentItemChanged ( QListWidgetItem * current, QListWidgetItem * previous );
//void itemPressed ( QListWidgetItem * item );
public slots:
void itemPressed_s ( QListWidgetItem * item );
void currentItemChanged_s ( QListWidgetItem * current, QListWidgetItem * previous );
public:
    int currentItemIndex;
    QListWidgetItem *currentItem;

protected:
	void paintEvent(QPaintEvent *pe);
	void keyPressEvent(QKeyEvent *event);
	void mouseMoveEvent(QMouseEvent *event);
};

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I`ve tried to make connection in CustomListWidget constructor (my last post)

Also I`ve tried in MainWindow constructore like

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
	ui->setupUi(this);
	QObject::connect(ui->listWidget, SIGNAL(itemPressed( QListWidgetItem * item )), SLOT(itemPressed_s ( QListWidgetItem * item )));
}

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
	ui->setupUi(this);
	QObject::connect(ui->listWidget, SIGNAL(itemPressed( QListWidgetItem * item )), SLOT(itemPressed_s ( QListWidgetItem * item )));
}

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but nothing happened. I always rebuild my project.

p.s.
here is my slot

void CustomListWidget::itemPressed_s ( QListWidgetItem * item )
{
 
}

void CustomListWidget::itemPressed_s ( QListWidgetItem * item )
{

}

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[Lykurg]

Hi,

make the connection in the c-tor of your CustomListWidget. And what exactly is not working for you? try

void CustomListWidget::itemPressed_s ( QListWidgetItem * item )
{
  qWarning() << "slot reached: itemPressed_s";
}

void CustomListWidget::itemPressed_s ( QListWidgetItem * item )
{
  qWarning() << "slot reached: itemPressed_s";
}

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Did you see the output?


And as a note: in your mainwindow it has to be:

QObject::connect(ui->listWidget, SIGNAL(itemPressed( QListWidgetItem * item )), ui->listWidget, SLOT(itemPressed_s ( QListWidgetItem * item )));

QObject::connect(ui->listWidget, SIGNAL(itemPressed( QListWidgetItem * item )), ui->listWidget, SLOT(itemPressed_s ( QListWidgetItem * item )));

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[aamer4yu]

You dont have to mention the type name in signal and slot,,,only the type.
This

QObject::connect(ui->listWidget, SIGNAL(itemPressed( QListWidgetItem * item )), SLOT(itemPressed_s ( QListWidgetItem * item )));

QObject::connect(ui->listWidget, SIGNAL(itemPressed( QListWidgetItem * item )), SLOT(itemPressed_s ( QListWidgetItem * item )));

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should be -

QObject::connect(ui->listWidget, SIGNAL(itemPressed( QListWidgetItem * )), SLOT(itemPressed_s ( QListWidgetItem * )));

QObject::connect(ui->listWidget, SIGNAL(itemPressed( QListWidgetItem * )), SLOT(itemPressed_s ( QListWidgetItem * )));

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Try and see if it works

[Lykurg]

@aamer4u: Damn, you are right! need to go to an optician

[Annihilator]

Ooops. that's it! Thanks, aamer4yu!

[aamer4yu]

@Lykurg... it happens sometimes to me too....the tiniest details are skipped by mind ,, u are not alone !!

@Annhilator.. welcome :-)