About QGraphicsItem question

[jiaorenjie]

when QGraphicsItem selected in QGraphicsScene, its bound will show in dashline.
How can i change this property?
i don't want to show dashline when QGraphicsItem selected.

[stampede]

I think you'll need to create a subclass and reimplement virtual void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) to draw the selection yourself. In order to prevent rendering of the default selection rect, you'll need to clear the QStyle::State_Selected flag from option argument:

// header, QGraphicsItemBaseClass should be the one you want to subclass (QGraphicsPixmapItem,QGraphicsEllipseItem,...)
 
class MyGraphicsItem:public QGraphicsItemBaseClass{
public:
    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
//...
 
// .cpp
void MyGraphicsItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget){
    QStyleOptionGraphicsItem opt = *option;
    opt.state &= ~QStyle::State_Selected; // clears the default selection marker
    QGraphicsItemBaseClass::paint(painter,&opt,widget); // render graphics item without selection rect
    //...
}

// header, QGraphicsItemBaseClass should be the one you want to subclass (QGraphicsPixmapItem,QGraphicsEllipseItem,...)

class MyGraphicsItem:public QGraphicsItemBaseClass{
public:
    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
//...

// .cpp
void MyGraphicsItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget){
    QStyleOptionGraphicsItem opt = *option;
    opt.state &= ~QStyle::State_Selected; // clears the default selection marker
    QGraphicsItemBaseClass::paint(painter,&opt,widget); // render graphics item without selection rect
    //...
}

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You can test for the QStyle::State_Selected flag in paint method to render the selection your way:

void MyGraphicsItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget){
    if( option->state & QStyle::State_Selected ){
        //... your selection rendering method here
    }
}

void MyGraphicsItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget){
    if( option->state & QStyle::State_Selected ){
        //... your selection rendering method here
    }
}

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