QGraphicsItem tooltip behavior

hi ppl,

I've got the following small prob:

Code:

---

#include <QtGui>
 
class MyGraphicsItem : public QGraphicsItem
{
	public:
		MyGraphicsItem(QGraphicsItem *parent = 0) : QGraphicsItem(parent), _width(40), _height(10){}
		~MyGraphicsItem(void){qDebug("delBand");}
 
		QRectF boundingRect() const{
			return QRectF(0, 0, _width, _height);
		}
		void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0){
			painter->setBrush(Qt::darkRed);
			painter->setPen(Qt::black);
			painter->drawRoundRect(0, 0, _width, _height);
		}
 
	private:
		int _width;
		int _height;
};

---

using:

Code:

---

setToolTip(QString("testToolTip"));

---

in the constructor, works perfectly to enable tooltips for the item

but using:

Code:

---

QString toolTip() const {
			return QString("testToolTip");
		}

---

does not work

why???:confused:

because QGraphicsItem::tooltip is not virtual.
The view/scene will always call the base class version, which returns an empty string if you don't set any.

Regards

Hi,

This post should be removed. Sorry.

Maverick

Hi,

Ok...solved.
I have saved this post at the same time when the answer was given.
This post is not needed. I hope moderator or admin will remove it.


Maverick

Quote:

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Originally Posted by marcel

because QGraphicsItem::tooltip is not virtual.
The view/scene will always call the base class version, which returns an empty string if you don't set any.

Regards

---

so there's no possibility to get the tooltip working without using setToolTip,

and to only to use a function like QString toolTip() const ?

Quote:

---

so there's no possibility to get the tooltip working without using setToolTip,

and to only to use a function like QString toolTip() const ?

---

No.

But if you do a little of extra work, you might be able to show a tooltip when you want it to, but manually.
Hint: override QGraphicsScene::helpEvent.

Regards

solved my prob the following way:

in constructor:

Code:

---

setAcceptsHoverEvents(true);

---

Code:

---

protected:
		void hoverEnterEvent ( QGraphicsSceneHoverEvent * event ){
			QString str = QString("testToolTip");
			if (toolTip() != str){
				setToolTip(str);
			}
		}

---

this does exactly, what I wanted,

but is a little long winded