mousePressEvent and QGroupBox

[Juba]

Hi all,
I'm trying to build a custom widget that act like a button, but with more feature, like icons and multple labels...

Like any button I'd like to start a "callback" when the button is clicked. I think that the signal slot model does not work for this inter class case.
So I try the following code:

header


class CallButton : public QWidget
{
Q_OBJECT

public:
CallButton(QWidget *parent = 0);
~CallButton();

protected:
void mousePressEvent(QMouseEvent *event);

QGroupBox *groupBox;
QLabel *label;
QLabel *icon;
};


and. cpp


CallButton::CallButton(QWidget *parent)
: QWidget(parent)
{
groupBox = new QGroupBox(this);
label = new QLabel("Label...");
icon = new QLabel;

QIcon fakeIcon = QIcon("eclipse24.png");
QPixmap pixmap = fakeIcon.pixmap(QSize(16, 16), QIcon::Normal, QIcon::On);
icon->setPixmap(pixmap);

QHBoxLayout *mainLayout = new QHBoxLayout;
mainLayout->addWidget(label);
mainLayout->addWidget(icon);
mainLayout->insertStretch(1);

groupBox->setStyleSheet(QString::fromUtf8("\
QGroupBox {\
background-color: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1,\
stop: 0 #FFFFFF, stop: 1 #E0E0E0);\
border: 2px solid gray;\
border-radius: 5px;\
}"));

groupBox->resize(180,60);
groupBox->setLayout(mainLayout);
}

void CallButton::mousePressEvent ( QMouseEvent * event )
{

groupBox->setStyleSheet(QString::fromUtf8("\
QGroupBox {\
background-color: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1,\
stop: 0 #E0E0E0, stop: 1 #FFFFFF);\
border: 2px solid gray;\
border-radius: 5px;\
}"));
}

CallButton::~CallButton()
{
delete groupBox;
delete label;
delete icon;
}


The application compile and run, but the event is not launched when I left click inside the button (the event is launched when I left click outside the QGroupBox area and anywhere where I right click).
Why the left click does not work?
Thank's in advance to everyone,
Stefano.

[tbscope]

Read more about installEventFilter and eventFilter.
http://doc.qt.nokia.com/4.6/qobject.html#eventFilter

[Juba]

Thanks tbscope,
The eventFilter solution works! I have made the following method, but I am a little scared about the performace of this solution....
Anyone has a more efficient implementation?



bool CallButton::eventFilter(QObject *obj, QEvent *event)
{
if (obj == groupBox) {
if (event->type() == QEvent::MouseButtonPress || event->type() == QEvent::MouseButtonDblClick) {
groupBox->setStyleSheet(QString::fromUtf8(PRESS_STYLE));
return true;

} else if (event->type() == QEvent::MouseMove) {
// check if the pointer goes outside object area
QMouseEvent *mouseEvent = static_cast<QMouseEvent*>(event);
QGroupBox *groupBoxObj = static_cast<QGroupBox*>(obj);
if( mouseEvent->x() < 0 || mouseEvent->x() > groupBoxObj->width()
|| mouseEvent->y() < 0 || mouseEvent->y() > groupBoxObj->height() ){
groupBox->setStyleSheet(QString::fromUtf8(RELEASE_STYLE));
}
return true;

} else if (event->type() == QEvent::MouseButtonRelease) {
groupBox->setStyleSheet(QString::fromUtf8(RELEASE_STYLE));
return true;

} else {
return false;
}

} else {
// pass the event on to the parent class
return QWidget::eventFilter(obj, event);
}
}