QGraphicsView : change selected rectangle style

[kghose]

Hi,

I like that QGraphicsView has all the basic select machinery written in, so we can have rubber band select and click select in our apps.

However, what I want to do is change the way the view indicates that the object is selected. By default it draws a dotted white rectangle along the bounding box. How can I change that?

Thanks
-K

[Radagast]

you should look into Qt sources to find out the answer
a dotted white rectangle along the bounding box is painted using internal Qt function, so you have to reimplement the paintEvent() and write there code for shape itself and for the selection box.

[kghose]

Hi,

I found the solution. You need to fiddle with the QStyleOptionGraphicsItem *option that is passed to the paint function.

My custom widget subclasses QGraphicsPixmapItem. I had reimplemented the paint function to call the regular paint funct and then my custom stuff. What I do now is as follows

void ThumbnailItem::paint (QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) {
	QStyleOptionGraphicsItem myoption = (*option);
	myoption.state &= !QStyle::State_Selected;
	QGraphicsPixmapItem::paint(painter, &myoption, widget);
           .... my own drawing routines ....

void ThumbnailItem::paint (QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) {
	QStyleOptionGraphicsItem myoption = (*option);
	myoption.state &= !QStyle::State_Selected;
	QGraphicsPixmapItem::paint(painter, &myoption, widget);
           .... my own drawing routines ....

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So I trap option, unset the option.state QStyle::State_selected bit, and then pass it on. I then have my own code for indicating its selected.

http://doc.trolltech.com/3.3/qstyle.html#details
http://doc.trolltech.com/4.2/qstyleo...m-members.html


-K