Pau Garcia i Quiles wrote:
Have you tried to use the wtwithqt library in examples/wtwithqt ?
I am using wtwithqt, as I mentioned in the last paragraph of my original
mail.
As it happens, since posting this, I have made some progress. I realised
that I had made my WApplication subclass also derive from QObject and it
was a slot of this object that I was connecting the signal to. However,
this was of course incorrect because the application is not created in
the QThread that WQApplication creates so, as I noted, there was no
event dispatcher for that object's thread.
I have modified my example code (attached) to connect the signal to an
object created in the correct QThread and the signal/slot connection now
works correctly. Unfortuanely, the application crashes when I try to
update the text in the label because calling
WApplication::instance()->session() is return an invalid pointer. I am
still digging into that.
Tristan
#include "WQApplication"
#include <Wt/WContainerWidget>
#include <Wt/WServer>
#include <Wt/WText>
#include <Wt/WVBoxLayout>
#include <QApplication>
#include <QPushButton>
/*------------------------------------------------------------------------------
QtObject
------------------------------------------------------------------------------*/
class QtObject : public QObject
{
Q_OBJECT
public:
static QtObject * get();
public slots:
void doSomething() { emit didSomething(); }
signals:
void didSomething();
protected:
QtObject() : QObject(NULL) {}
};
//------------------------------------------------------------------------------
QtObject * QtObject::get()
{
static QtObject * instance = NULL;
if (instance == NULL)
{
instance = new QtObject();
}
return instance;
}
/*------------------------------------------------------------------------------
CounterWidget
------------------------------------------------------------------------------*/
class CounterWidget : public QObject, public Wt::WContainerWidget
{
Q_OBJECT
public:
CounterWidget(Wt::WContainerWidget * parent = NULL);
protected slots:
void increment();
protected:
Wt::WText * label;
uint count;
};
//------------------------------------------------------------------------------
CounterWidget::CounterWidget(Wt::WContainerWidget * parent)
: Wt::WContainerWidget(parent), count(0)
{
Wt::WVBoxLayout * mainLayout = new Wt::WVBoxLayout();
setLayout(mainLayout, Wt::AlignTop | Wt::AlignJustify);
label = new Wt::WText(this);
label->setText("0");
mainLayout->addWidget(label);
connect(QtObject::get(), SIGNAL(didSomething()), SLOT(increment()));
}
//------------------------------------------------------------------------------
void CounterWidget::increment()
{
++count;
label->setText(Wt::toWString(QString::number(count)));
}
/*------------------------------------------------------------------------------
WebApplication
------------------------------------------------------------------------------*/
class WebApplication : public Wt::WQApplication
{
public:
WebApplication(const Wt::WEnvironment & env);
virtual void create();
virtual void destroy() {}
};
//------------------------------------------------------------------------------
WebApplication::WebApplication(const Wt::WEnvironment & env)
: Wt::WQApplication(env, true)
{
}
//------------------------------------------------------------------------------
void WebApplication::create()
{
Wt::WVBoxLayout * mainLayout = new Wt::WVBoxLayout();
root()->setLayout(mainLayout, Wt::AlignTop | Wt::AlignJustify);
mainLayout->addWidget(new CounterWidget(root()));
}
//------------------------------------------------------------------------------
Wt::WApplication * createApplication(const Wt::WEnvironment & env)
{
return new WebApplication(env);
}
/*------------------------------------------------------------------------------
main()
------------------------------------------------------------------------------*/
#include "main.moc"
// fake the commandline arguments for Wt::WebServer
char * fake_argv[] =
{
"connect_test",
"--http-address=0.0.0.0",
"--http-port=80",
"--deploy-path=/",
"--docroot=."
};
//------------------------------------------------------------------------------
int main(int argc, char ** argv)
{
Wt::WServer server(fake_argv[0], "wt_config.xml");
server.setServerConfiguration(5, fake_argv, WTHTTP_CONFIGURATION);
server.addEntryPoint(Wt::Application, &createApplication);
// create a Qt object in the main thread
QtObject * object = QtObject::get();
QApplication app(argc, argv);
QPushButton button;
button.setText("Press me");
// connect button to emit signal from Qt object in the main thread
QObject::connect(&button, SIGNAL(clicked()), object, SLOT(doSomething()));
button.show();
server.start();
return app.exec();
}
------------------------------------------------------------------------------
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