QGrsphicsItem click and hover events

[liqxpil]

hi

I need to create an inherited class of QGraphicsItem that implements the mouse click and hover events in it, can anybody give a simple example of how to do this??

thanks.

[Lykurg]

Simple reimplement the event handlers: QGraphicsItem::mousePressEvent(), QGraphicsItem::mouseReleaseEvent() and QGraphicsItem::mouseMoveEvent(), but for the last you have to set the corresponding flag to receive these events.

[Ceelaz]

Here is an example:

#include <QGraphicsItem>
 
class Test : public QGraphicsItem
{
    Q_OBJECT
public:
 
    // Konstruktor
    Test(QGraphicsItem *parent = 0) :
        QGraphicsItem(parent)
    {
        // initialize
    }
 
protected:
    /**
      * Event: Mousbutton is released ( = Clicked)
      * @param event
      */
    void mouseReleaseEvent(QGraphicsSceneMouseEvent *event){
        // do something
 
        // call the parents's event
        QGraphicsItem::mouseReleaseEvent(event);
    }
 
    /**
      * Mousecursor enters Widget.
      */
    void hoverEnterEvent(QGraphicsSceneHoverEvent *event){
 
        // do something
 
        QGraphicsItem::hoverEnterEvent(event);
    }
 
    /**
      * Mousecursor leaves Widget
      */
    void hoverLeaveEvent(QGraphicsSceneHoverEvent *event) {
 
        // do something
 
        QGraphicsItem::hoverLeaveEvent(event);
    }
 
    /**
      * Mousecursor is moved in Widget.
      */
    void hoverMoveEvent(QGraphicsSceneHoverEvent *event){
 
        // do something
 
        QGraphicsItem::hoverMoveEvent(event);
    }
};

#include <QGraphicsItem>

class Test : public QGraphicsItem
{
    Q_OBJECT
public:

    // Konstruktor
    Test(QGraphicsItem *parent = 0) :
        QGraphicsItem(parent)
    {
        // initialize
    }

protected:
    /**
      * Event: Mousbutton is released ( = Clicked)
      * @param event
      */
    void mouseReleaseEvent(QGraphicsSceneMouseEvent *event){
        // do something

        // call the parents's event
        QGraphicsItem::mouseReleaseEvent(event);
    }

    /**
      * Mousecursor enters Widget.
      */
    void hoverEnterEvent(QGraphicsSceneHoverEvent *event){

        // do something

        QGraphicsItem::hoverEnterEvent(event);
    }

    /**
      * Mousecursor leaves Widget
      */
    void hoverLeaveEvent(QGraphicsSceneHoverEvent *event) {

        // do something

        QGraphicsItem::hoverLeaveEvent(event);
    }

    /**
      * Mousecursor is moved in Widget.
      */
    void hoverMoveEvent(QGraphicsSceneHoverEvent *event){

        // do something

        QGraphicsItem::hoverMoveEvent(event);
    }
};

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[liqxpil]

great thanks guys