Development/Tutorials/Collaboration/Attica/Introduction

Development/Tutorials/Collaboration/Attica/Introduction

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Attica Introduction

Tutorial Series	Attica
Previous	Getting started with KDE development
What's Next	n/a
Further Reading	n/a

Overview

In this tutorial you learn how to use Attica to access the Open Collaboration Services in your application.

Our goal is to get a list of friends for any user registered on this site.

With Attica you can easily access services from providers such as openDesktop.org. It implements the freedesktop.org specification for the Open Collaboration Services API.

Initializing the Provider Manager

Attica supports multiple Open Collaboration Service (OCS) providers at the same time. Therefor the first thing to do is getting a ProviderManager and either asking it for a default provider (e.g. openDesktop.org for KDE) or setting a different provider by hand. Let's create a mainwindow class that loads a default provider.

mainwindow.h

//mainwindow.h

1. ifndef MAINWINDOW_H
2. define MAINWINDOW_H

1. include <KMainWindow>
2. include <KLineEdit>
3. include <QLabel>

1. include <attica/providermanager.h>
2. include <attica/provider.h>

class MainWindow : public KMainWindow {

   Q_OBJECT

public:

   MainWindow(QWidget *parent=0);

public Q_SLOTS:

   void providersChanged();

private:

   Attica::Provider m_provider;
   Attica::ProviderManager m_manager;

};

1. endif

mainwindow.cpp

//mainwindow.cpp

1. include "mainwindow.h"

1. include <KDebug>
2. include <QVBoxLayout>

1. include <attica/providermanager.h>
2. include "simplepersonrequest.h"

MainWindow::MainWindow(QWidget *parent) : KMainWindow(parent) {

   connect(&m_manager, SIGNAL(providersChanged()), SLOT(providersChanged()));
   m_manager.loadDefaultProviders();

}

void MainWindow::providersChanged() {

   if (!m_manager.providers().isEmpty()) {
       m_provider = m_manager.providerByUrl(QUrl("https://api.opendesktop.org/v1/"));
       if (!m_provider.isValid()) {
           kDebug() << "Could not find opendesktop.org provider.";
           return;
       }

       QTabWidget* mainWidget = new QTabWidget(this);
       setCentralWidget(mainWidget);

       SimplePersonRequest* personWidget = new SimplePersonRequest(m_provider, this);
       mainWidget->addTab(personWidget, tr("Person Search"));
       
       ContentDownload* contentWidget = new ContentDownload(m_provider, this);
       mainWidget->addTab(contentWidget, tr("Content"));

       ContentCreation* contentCreationWidget = new ContentCreation(m_provider, this);
       mainWidget->addTab(contentCreationWidget, tr("Add Content"));
   }

}

1. include "mainwindow.moc"

simplepersonrequest.h

1. ifndef SIMPLEPERSONREQUEST_H
2. define SIMPLEPERSONREQUEST_H

1. include <QtGui/QLabel>
2. include <KLineEdit>
3. include <attica/provider.h>

class SimplePersonRequest :public QWidget {

   Q_OBJECT

public:

   SimplePersonRequest(Attica::Provider provider, QWidget* parent = 0);

public Q_SLOTS:

   void nickChanged(const QString& nick);
   void onPersonJobFinished( Attica::BaseJob *job );
   

private:

   KLineEdit* mNickNameLineEdit;
   QLabel* mNameLabel;
   QLabel* mLocationLabel;
   QString mNick;
   Attica::Provider m_provider;

};

1. endif // SIMPLEPERSONREQUEST_H

simplepersonrequest.cpp

1. include "simplepersonrequest.h"

1. include <KDebug>
2. include <QtGui/QBoxLayout>
3. include <QtGui/QSpacerItem>

1. include <attica/person.h>
2. include <attica/itemjob.h>

SimplePersonRequest::SimplePersonRequest(Attica::Provider provider, QWidget* parent)

   : QWidget(parent)
   , m_provider(provider)

{

   QVBoxLayout* layout = new QVBoxLayout(this);
   
   mNickNameLineEdit = new KLineEdit();
   layout->addWidget(mNickNameLineEdit);

   mNameLabel = new QLabel(this);
   mNameLabel->setText("Name");
   layout->addWidget(mNameLabel);

   mLocationLabel = new QLabel(this);
   mLocationLabel->setText("Picture");
   layout->addWidget(mLocationLabel);

   mNick = "fregl";
   mNickNameLineEdit->setText(mNick);
   connect(mNickNameLineEdit, SIGNAL(returnPressed(QString)), SLOT(nickChanged(QString)));
   nickChanged(mNick);

}

void SimplePersonRequest::nickChanged(const QString& nick) {

   mNick = nick;
   Attica::ItemJob<Attica::Person>* job = m_provider.requestPerson(mNick);
   connect(job, SIGNAL(finished(Attica::BaseJob*)), SLOT(onPersonJobFinished(Attica::BaseJob*)));
   job->start();

}

void SimplePersonRequest::onPersonJobFinished( Attica::BaseJob *job ) {

   kDebug() << "onJobFinished";
   Attica::ItemJob<Attica::Person> *personJob = static_cast< Attica::ItemJob<Attica::Person> * >( job );
   if( personJob->metadata().error() == Attica::Metadata::NoError ) {
       Attica::Person p(personJob->result());
       mNameLabel->setText(p.firstName() + ' ' + p.lastName());
       mLocationLabel->setText(p.city());
   } else {
       mNameLabel->setText("Could not fetch information.");
   }

}

1. include "simplepersonrequest.moc"