From Forum Nokia Wiki

ID	...	Creation date	7 August 2009
Platform	S60 3rd Edition FP1, S60 3rd Edition FP2, S60 5th Edition	Tested on devices	S60 Emulator
Category	Qt for S60	Subcategory	UI

Keywords (APIs, classes, methods, functions): QGraphicsTextItem,QGraphicsItem

Overview

This is code for blinking text. Where the GraphicsView is refreshed every time with the help of update() function.This function will work after several seconds of time delay.

The text is then repainted with the help of paint() method.Time delay is defined as constant so that their should be no change in value during execution of program.

Preconditions

• Download and Install latest version Qt for Symbian - Installation packages which has links on how to install the latest version

Code Snippet

Main cpp

#include <QApplication>
#include <QGraphicsView>
#include <QGraphicsScene>
#include <QGraphicsTextItem>
 
const int delay = 200;//set delay as per required
 
class MyTextItem : public QGraphicsTextItem
{
public:
    MyTextItem()
    {
        startTimer(delay); // start a timer
        drawItem = true;
    }
 
    void timerEvent(QTimerEvent *)
    {
        // no update if the item is not visible
        if(!isVisible())
            return;
 
        drawItem = !drawItem;
        update();
    }
 
    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
    {
        if (drawItem) {
            // call the parent's implementation to draw the text
            QGraphicsTextItem::paint(painter, option, widget);
        }
    }
private:
    bool drawItem;
};
 
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    QGraphicsScene scene(0,0, 400,320);
    QGraphicsView view(&scene);
 
    MyTextItem item;
    item.setPlainText("Qt rocks on Symbian!");
    scene.addItem(&item);
    item.setPos(125, 100);
 
    view.show();
    return app.exec();
}