QgrpahicsProxyWidget: dragging and sizeing

**tuli** · 20th September 2013, 16:33

Hi,

i am working on graphics-scene, which currently adds a QGrpahicsItems subclass and does some custom drawing in the pain() event. This works fine, but now i#d like to add a custom widget, consisting of 4 child-widgets. I derive from QGraphicsProxyWidget (instead of QGraphicsItem) and add my widget, before putting it on the scene. There are just two problems with that:

1) i cant drag the item around anymore, despite QGraphicsItem::ItemIsMovable. i suspect this is because my widget "steals" the input. How can i pass the events "up"?
2) and more importantly, the widget is not properly sized. See the screenshot attached. When i apply some exotic kungfu, which sets the size of item to a value bigger than the size of the widget, the
widget is shown (with a large margin). So i suppose the question is how can i communicate the size as reported by the layout of the custom widget to the coating QGraphicsProxyWidget?

Qt Code:

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class MyWidItem : public QGraphicsProxyWidget
{
MyWidItem()
{
	// doesnt work!!
	setFlag(QGraphicsItem::ItemIsMovable);
	setFlag(QGraphicsItem::ItemIsSelectable);
 
	setWidget(new MyButtonTextWidget()); //my custom widget with 4 buttons and a lineedit
 
	// the other problem is the sizing, see screenshot.
}
};
 
 
class MyItem : public QGraphicsItem
{
MyWidItem()
{
	// perfectly fine!
	setFlag(QGraphicsItem::ItemIsMovable);
	setFlag(QGraphicsItem::ItemIsSelectable);
}
};
 
 
i then add my MyWidItem to the scene like this:
 
 
//...
    MyWidItem *item = new MyWidItem();
    thescene->addItem(item); //add an itme to the graphicsscene
    itemvector.append(item); //custom stuff
//...

class MyWidItem : public QGraphicsProxyWidget
{
MyWidItem()
{
	// doesnt work!!
	setFlag(QGraphicsItem::ItemIsMovable);
	setFlag(QGraphicsItem::ItemIsSelectable);
	
	setWidget(new MyButtonTextWidget()); //my custom widget with 4 buttons and a lineedit
	
	// the other problem is the sizing, see screenshot.
}
};


class MyItem : public QGraphicsItem
{
MyWidItem()
{
	// perfectly fine!
	setFlag(QGraphicsItem::ItemIsMovable);
	setFlag(QGraphicsItem::ItemIsSelectable);
}
};


i then add my MyWidItem to the scene like this:


//...
    MyWidItem *item = new MyWidItem();
    thescene->addItem(item); //add an itme to the graphicsscene
    itemvector.append(item); //custom stuff
//...

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here is the real widget and how it is displayed on the scene:

grapherror.PNG

any help is appreciated!