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;
};

class CallButton : public QWidget
{
    Q_OBJECT

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

protected:
    void mousePressEvent(QMouseEvent *event);

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

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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;
}

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;
}

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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);
     }
}

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);
     }
}

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