How do draw a frame in QListView?

[someralex]

this code work

QPainter painter(viewport()); 
    QPen pen(Qt::green, 10, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin); 
    painter.setPen(pen); 
    painter.drawRect(rect()); 
    painter.translate(-horizontalScrollBar()->value(), -verticalScrollBar()->value()); 
    QListView::paintEvent(event);

QPainter painter(viewport()); 
    QPen pen(Qt::green, 10, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin); 
    painter.setPen(pen); 
    painter.drawRect(rect()); 
    painter.translate(-horizontalScrollBar()->value(), -verticalScrollBar()->value()); 
    QListView::paintEvent(event);

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but :
1.at scrolling of list, top and bottom lines of rectangle erase.If using painter.translate identical effect
2.rectangle paint over item

[jpn]

Translate first, then draw. Translating the painter after painting has no effect. The default QItemDelegate painting implementation fills items' background with QPalette::Base. That's why I told you to use a transparent brush.

[someralex]

after using

QPalette p = listView->palette();
p.setBrush(QPalette::Base, Qt::transparent);
listView->setPalette(p);

QPalette p = listView->palette();
p.setBrush(QPalette::Base, Qt::transparent);
listView->setPalette(p);

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all ok. Thanks
but rectangle paint over viewport of scrollView
How i need to replace the standard border?
QFrame:ainter() ?

[wysota]

There is no such thing as "QFrame::Painter()".

[someralex]

where then to draw decoration of widget - border,shade ?

[wysota]

It's drawn in the paintEvent (probably using QStyle primitives). I don't think you really wish to change that, but of course it is possible by reimplementing the event and drawing your own frame. It might be simpler to use stylesheets to substitute the frame with your border image or changing the style to draw another frame.

[someralex]

Can I obtain painter for parent QFrame in paintEvent method in QListView and re-draw it the way I want? If I can, how can I get it? Or do I need to create my own QFrame based on standard and create my ListView based on QListView and QFrame (class myView(QWidget *parent = 0) : public QListView, public myFrame) ?

[wysota]

You don't "obtain" a painter, you create it:

void MyWidget::paintEvent(QPaintEvent *e){
  QPainter painter(this);
  painter.drawRect(...);
  //...
}

void MyWidget::paintEvent(QPaintEvent *e){
  QPainter painter(this);
  painter.drawRect(...);
  //...
}

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[someralex]

If I use:

QPainter painter(this);

QPainter painter(this);

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nothing can be drawn and I get an error :

QPainter::begin: Widget painting can only begin as a result of a paintEvent

when cursor of the mouse enters the area of the window where widget is placed.

[wysota]

Obiously you can only create a painter in a paint event, like in the snippet I gave you in the previous post.

[someralex]

yes, I do exactly just like shown in your previous post. it gives me an error and draws nothing

[wysota]

Can we see the code along with the class declaration?