Refresh + QGraphicItem + drawText

[NoRulez]

Hey @all,

for my Project I decided to subclass QGraphicItem and reimplement the paint function.

void MyItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) {
    // Draw the pixmap
    //painter->drawPixmap(...);
 
    // Draw the item text
    painter->drawText(QRectF(-_pixmap.width(), 5, _pixmap.width(), 25), Qt::AlignHCenter, "Demotext");
}

void MyItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) {
    // Draw the pixmap
    //painter->drawPixmap(...);

    // Draw the item text
    painter->drawText(QRectF(-_pixmap.width(), 5, _pixmap.width(), 25), Qt::AlignHCenter, "Demotext");
}

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From now, when i move the drawn item, the text aren't repainted / updated. When i move the graphics item fast over the graphics scene, then there are only black fragments from the text, but no "Demotext".

What I'm doing wrong?

Best Regards
NoRulez

[wagmare]

i think the update() is calling before the paint() completes drawText() ..
use qApp->processEvents(); in the paint() ..
this paint i think we cant use QThreads() any way u try any other option like mandelbolt example ... http://doc.trolltech.com/4.3/threads-mandelbrot.html

[NoRulez]

I tried also

QApplication::processEvents();

QApplication::processEvents();

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at the end of the function, but nothing was changed.

I've attached an example to show how it looks

Best Regards
NoRulez

[wagmare]

exactly the next update() is called the paint::update() before drawText() ...

is it possible to port a new QEventLoop() in the code .. ? or QThread() .. this seperate event loop should emit the signal to update() when user moves the cursor ..
did u see the mandelbrot example ..

[NoRulez]

I think i found the solution, the problem was within the boundingRect() function, where the text wasn't included.

Best Regards