Signals and Slots Problem

[GenericProdigy]

I'm currently writing a small utility and I've created custom inner-widgets for my main window that will throw their events / call backs back up to the top-level controller. Unfortunately the events do not seem to be working with the signals and slots mechanism.

I suspect I've made some obvious mistake, but having spent an entire day looking at this, I'm at a loss to find any answers. A snippet of code is below:

maintabs.h


#ifndef MAINTABS_H
#define MAINTABS_H

#include "pagewidget.h"

#include "ui_maintabs.h"

class MainTabs : public QTabWidget
{
Q_OBJECT

public:
MainTabs(QWidget *parent = 0);
void addPage(PageWidget *page, const char *text);

public slots:
void removePage(PageWidget *page);

private:
Ui::MainTabs ui;
};

#endif

maintabs.cpp


#include <QtGui>

#include "maintabs.h"

MainTabs::MainTabs(QWidget *parent)
: QTabWidget(parent)
{
ui.setupUi(this);
}

void MainTabs::addPage(PageWidget *page, const char *text)
{
connect(page, SIGNAL(pageClosed(PageWidget)), this, SLOT(removePage(PageWidget)));
this->addTab(page, QString());
this->setTabText(this->indexOf(page), QApplication::translate("MainWindow", text, 0, QApplication::UnicodeUTF8));
}

void MainTabs::removePage(PageWidget *page)
{
this->removeTab(this->indexOf(page));
}

pagewidget.h


#ifndef PAGEWIDGET_H
#define PAGEWIDGET_H

#include "ui_pagewidget.h"

class PageWidget : public QWidget
{
Q_OBJECT

public:
PageWidget();
void setPage(QWidget* page);

public slots:
void closeClicked();

signals:
void pageClosed(PageWidget*);

private:
Ui::PageWidget ui;
};

#endif

pagewidget.cpp


#include <QtGui>

#include "pagewidget.h"

PageWidget::PageWidget()
: QWidget()
{
ui.setupUi(this);
}

void PageWidget::setPage(QWidget* page)
{
ui.verticalLayout->removeWidget(ui.mainWidget);
ui.verticalLayout->removeWidget(ui.buttonBox);
ui.verticalLayout->addWidget(page);
ui.verticalLayout->addWidget(ui.buttonBox);

connect(ui.buttonBox, SIGNAL(rejected()), this, SLOT(closeClicked()));
}

void PageWidget::closeClicked()
{
emit pageClosed(this);
}

Now the PageWidget is a custom page object that all tab pages will inherit from. The MainTabs is my QTabWidget object. The idea is for each page to have a 'Close' button and when that is clicked an event is shot up to the main controller of the QMainWindow object. Unfortunately, although the PageWidget::closeClicked() method is invoked, the pageClosed(PageWidget*) method does not seem to be getting hit within the MainTabs class.

I hope I've provided enough information, and that someone is inclined to provide me with an answer. I'm assuming it's simply a lack of knowledge on my part of the SLOTS and SIGNALS mechanism within Qt.

And of course, any tips on how to improve my approach would be welcome.

Regards,

P.

[caduel]

(remark: you should probably be getting error messages about not found signals/slots on your console.)

fix your signal/slots in the connect statement to contain the "*".

connect(page, SIGNAL(pageClosed(PageWidget*)), SLOT(removePage(PageWidget*)));

[GenericProdigy]

Well that was simple. There were no errors interestingly enough, but your solution worked perfectly. Appreciated.

P.

[jpn]

There were no errors interestingly enough
Signal-slot connections are established at run time, not at compile time. Signal and slot signatures are just strings for compliler, thus no errors. However, as caduel already pointed out, QObject::connect() will output a detailed warning when a connection fails.

[GenericProdigy]

Stepping through the code I saw nothing. Perhaps I missed something. It looked as though the connect worked, but nothing recieved it, but I'm using a new IDE - perhaps it was hidden somewhere.