Archived:Using QSequentialAnimationGroup with QGraphicsTextItem

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Qt Quick should be used for all UI development on mobile devices. The approach described in this article (using C++ for the Qt app UI) is deprecated.

Article Metadata

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Tested with

Devices(s): Tested on Nokia 5800 XpressMusic

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Compatibility

Platform(s): All platforms supported by Qt

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Article

Keywords: QSequentialAnimationGroup, QPropertyAnimation, QGraphicsTextItem

Created: User:Kbwiki (20 Oct 2010)

Last edited: hamishwillee (11 Oct 2012)

Description

QSequentialAnimationGroup, derived from QAnimationGroup, can be used to run a number of animations in sequence, starting the next animation after one has finished playing. The animations are played in the order they are added to the group (using addAnimation() or insertAnimation()). The animation group finishes when its last animation has finished.

Solution

The following piece of code demonstrates the usage of QSequentialAnimationGroup with QGraphicsTextItem objects.

  #include <QtGui/QApplication>
  #include <QDesktopWidget>
  #include <QMainWindow>
  #include <QPropertyAnimation>
  #include <QSequentialAnimationGroup>
  #include <QGraphicsView>
  #include <QGraphicsScene>
  #include <QGraphicsTextItem>
 
 
  class MainWindow : public QMainWindow
    {
    Q_OBJECT
 
  public:
    MainWindow( QWidget* parent = 0 );
    ~MainWindow() {}
 
  private:
    QGraphicsScene m_scene;
    QGraphicsTextItem* m_text1;
    QGraphicsTextItem* m_text2;
    };
 
 
  MainWindow::MainWindow( QWidget* parent )
      : QMainWindow( parent )  
    {
    // Start and end positions of QGraphicsItem objects
    QRect screenRect = QApplication::desktop()->availableGeometry();
    m_scene.setSceneRect(screenRect);
 
    QPointF startPos1( screenRect.right(), screenRect.bottom()/2 - 25 );
    QPointF endPos1( startPos1 );
    endPos1.rx() = 50;
 
    QPointF startPos2( startPos1 );
    startPos2.ry() += 50;
 
    QPointF endPos2( endPos1 );
    endPos2.ry() += 50;
 
    m_text1 = new QGraphicsTextItem( "First line of text" );
    m_text1->setPos( startPos1 );
    m_scene.addItem( m_text1 );
 
    m_text2 = new QGraphicsTextItem( "Second line of text" );
    m_text2->setPos( startPos2 );
    m_scene.addItem( m_text2 );
 
    QPropertyAnimation* animText1 = new QPropertyAnimation( m_text1, "pos" );  
    animText1->setDuration( 1500 );
    animText1->setStartValue( startPos1 );
    animText1->setEndValue( endPos1 );
    animText1->setEasingCurve( QEasingCurve::OutSine );
 
    QPropertyAnimation* animText2 = new QPropertyAnimation( m_text2, "pos" );
    animText2->setDuration( 1500 );
    animText2->setStartValue( startPos2 );
    animText2->setEndValue( endPos2 );
    animText2->setEasingCurve( QEasingCurve::OutSine );
 
    QGraphicsView* view = new QGraphicsView( &m_scene, this );
    view->setHorizontalScrollBarPolicy( Qt::ScrollBarAlwaysOff );
    view->setVerticalScrollBarPolicy( Qt::ScrollBarAlwaysOff );
    setCentralWidget( view );
 
    // Add the animation to a sequential animation group and start the animation
    QSequentialAnimationGroup* animGroup = new QSequentialAnimationGroup( this );
    animGroup->addAnimation( animText1 );
    animGroup->addAnimation( animText2 );
    animGroup->start();
    }
 
 
  #include "main.moc"
 
  int main( int argc, char *argv[] )
    {
    QApplication a( argc, argv );  
    MainWindow w;
    w.showMaximized();
    return a.exec();
    }