Not use QCustomEvent class in Qt 4.7.4

phamvanan

Hi all,
I try use QCustomEvent but
Although,
@#include <QCustomEvent>@
When i use it,
@ QApplication::postEvent(QApplication::instance(), new QCustomEvent(MyEvent));@
I get error:
@error: C2061: syntax error : identifier 'QCustomEvent'@

Thanks.

raven-worx

my fault... the link wasn't still up to date.
QCustomEvent is only available if your Qt4 is built with Qt3 support.

For "Qt4":http://qt-project.org/doc/qt-4.7/porting4.html#id-4cb0a3dc-e4b9-45f1-be70-546d53022c96 just leave out the QCustomEvent and keep proceeding.... meaning just send the event directly without wrapping it in a QCustomEvent.
The MyEvent object should be a custom class derived from QEvent. In there set all the data you need.

phamvanan

Hi,
In Qt 4.7, Which replace to QCustomEvent?
I have two Objects, one is Copier class, else MainWindow class.
At copier class I want call postEvent function to Mainwindow class with a data. In mainwindow class how to get data event?
Thanks.

SGaist

Hi,

In the event filter, check against your event type and then cast it to your class so you can access your data.

phamvanan

Hi,
I found a document link about "event and fitter event":http://qt-project.org/doc/qt-4.8/eventsandfilters.html
I see a example fitter event but i don't understand what's MyCustomEventType ?
I created a class MyCustomEvent as below:
@
#include <QEvent>

class MyCustomEvent : public QEvent{
explicit MyCustomEvent(QObject *parent = 0);
public:
qint64 byteCopied;
};
#endif // MYCUSTOMEVENT_H

@
When I postEvent,
@
MyCustomEvent *event;
event->byteCopied = 1204;
QApplication::postEvent(QApplication::instance(), event);
@
How to check type and get my data in eventFilter function.
@
bool MainWindow::eventFilter(QObject *object, QEvent *event){

}
@
Thanks,
An.

raven-worx

you will need to register your event type somewhere early in your application ( main() or MainWindow constructor ):

you MyCustomEvent implementation:
@
#include <QEvent>

class MyCustomEvent : public QEvent
{
public:
explicit MyCustomEvent(QObject *parent = 0) : QEvent(MyCustomEvent::customType)
{
}

qint64 byteCopied;
static const QEvent::Type customType;

};
#endif // MYCUSTOMEVENT_H
@

in main.cpp
@
#include "MyCustomEvent.h"

const QEvent::Type MyCustomEvent::customType = static_castQEvent::Type(QEvent::registerEventType());

int main()
{
QApplication app;
...
}
@

in your eventFilter():
@
if( event->type() == MyCustomEvent::customType )
{
...
}
@

phamvanan

Thanks for your answer and quickly edit.
An.