maemo.org - Talk - View Single Post - Say NO! to Qt-based Maemo!

nicola.mfb	2010-04-20 , 17:13
Posts: 107 \| Thanked: 74 times \| Joined on Jan 2010	#99

Just for those that thinks qt is not easy, this is little tool that shows how to create a button that when clicked emit a signal on the session bus.

mywidget.h

Code:

#include <QWidget>
#include <QPushButton>
#include <QVBoxLayout>
#include <QDBusConnection>

class MyWidget : public QWidget
{
  Q_OBJECT
  public:
  MyWidget() : QWidget() {
    QDBusConnection::sessionBus().registerObject("/",this,QDBusConnection::ExportAllContents);
    new QVBoxLayout(this);
    QPushButton *b = new QPushButton("emit signal",this);
    layout()->addWidget(b);
    connect(b,SIGNAL(clicked()),SIGNAL(clicked()));
    show();
  }
  signals:
    void clicked();
};

main.cpp

Code:

#include <QApplication>
#include "mywidget.h"

int main(int argc, char **argv)
{
  QApplication app(argc, argv);
  new MyWidget();
  return app.exec();
}

gui_dbus.pro

Code:

SOURCES += main.cpp
QT += gui dbus
HEADERS += mywidget.h

That's was done in 2 minutes using vi, 20 seconds of that was spent to launch "assistant", type in the search bar "registerObject", click on RegisterOptions and retrieve QDBusConnection::ExportAllContents define that I always do not remember.

Further some seconds to build and launch:

qmake; make; ./gui_dbus

tested with dbus-monitor:

signal sender=:1.223 -> dest=(null destination) serial=6 path=/; interface=local.MyWidget; member=clicked

Now convince me that is easy and fast to use gtk, dbus lib, autoscan, autoreconf, configure, pkgconfig, and so on....

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