how to draw check box using qstyle in a qgraphicsitem

[wagmare]

hi friends,

how to draw checkbox using qstyle in a qgraphicsitem .?
i tried not to use qgraphicsproxy widget so i tried to use qstyle but i was facing a problem in setting the text color of the checkbox.

please correct me if im wrong in this implementation ..



class CheckBoxItem : public QGraphicsObject,public QGraphicsLayoutItem
{
public:
CheckBoxItem(const QString & text,QGraphicsItem *parent =0);
QString m_text;
QRectF boundingRect() const;
protected:
void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);

void mousePressEvent(QGraphicsSceneMouseEvent *event);


QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint) const;
void setGeometry(const QRectF &rect);


private:
bool m_mousePressed;


};

in .cpp

CheckBoxItem::CheckBoxItem(const QString &text, QGraphicsItem *parent)
: QGraphicsObject(parent),m_mousePressed(false)
{
m_text = text;
}
void
CheckBoxItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
QFont font("Serif",8);
painter->setFont(font);

const QStyle *style = QApplication::style();
QStyleOptionButton opt;

opt.state |= m_mousePressed ? QStyle::State_On : QStyle::State_Off;
opt.state |= QStyle::State_Enabled;
// opt.palette = QPalette(Qt::red);
opt.text = m_text;
opt.rect = option->rect;
opt.palette = QPalette(Qt::white);

style->drawControl(QStyle::CE_CheckBox,&opt,painter);

}

QSizeF
CheckBoxItem::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
{
return boundingRect().size();
}

void
CheckBoxItem::setGeometry(const QRectF &rect)
{
setPos(rect.topLeft());
}





i dont know how to change the color and font size of the text in check box .. but check box is coming fine ..
please help ..

[aamer4yu]

Why do you want to reinvent the wheel ? You can look for QML desktop elements since Qt 5.1

And if you are not using QML, you can anyhow add a widget to QGraphicsScene :)

[wagmare]

you can anyhow add a widget to QGraphicsScene
i want to add thousands of checkboxes in my view so i preffered not to go for QGraphicsWidget as to reduce load .. so i tried to make a checkbox graphicsitem with cachemode .

[spirit]

QStyleOptionButton inherits QStyleOption. QStyleOption has fontMetrics. So, I guess, you can "feed" your own font metrics in CheckBoxItem:: paint. As for text color, QStyleOption has palette, so you just need to set proper color for QPalette::WindowText or other *Text.

Other thing, you don't see you draw a check box's text using QStyle::drawControl with CE_CheckBoxLabel passed.