MouseMoveEvent deal between QGraphicsView and QGraphicsItem

Hi,

I have very similar problem regarding this subject.

I have a QGraphicsView and QGraphicsScene and some QGraphicsItem (as usual). For again to zoom upan a rubberband action I needed to reimplement mouse move event in QGraphicsView. Moreover, I also want to change the color of the item whenever mouse moves on the item. So it seemed I need to reimplement the mouse move event also in the QGraphicsItem. But I doesn't work. I also tried out eventFilter thing.

Can anyone help me?

Thanks in advance

For changing color of item when mouse is over, you dont need to capture mouse move events.

You simply need a check in the paint function -

Code:

---

if(option->state & QStyle::State_MouseOver)

---

and then color the item accordingly.
:)

Hi,

Ok but what if I want to handle the coloring issue in the mouse move event? I see that this is a general problem and asked by some users of this forum before. Is there a way to reimplement mouse move event both in GraphicsView and GraphicsItem?

Edit: By the way it doesn't work unless I remove option->state part of the if statement. Moreover, although I remove this part, It changes the color that it must change when the program begins, but you know I want to change the color of the item when the mouse is on the item. I could provide my code if you want.

Thanks in advance

Hi,

Does anybody has an idea on this subject?

You will need to store a variable for color.
Say you have QColor m_color in your graphics item class.
Then in paint event you do the following -

Code:

---

paint()
{
      QColor color = m_color;
      if(option->state & QStyle::State_MouseOver)
          color = m_color.dark();
 
 
       painter->fillRect(boundingRect(),color);
}

---

thats it, and now when you hover over the item, it will become dark.
Remember to set QGraphicsItem::setAcceptHoverEvents to true :)

Quote:

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Originally Posted by zgulser

Ok but what if I want to handle the coloring issue in the mouse move event? I see that this is a general problem and asked by some users of this forum before. Is there a way to reimplement mouse move event both in GraphicsView and GraphicsItem?

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You must add QGraphicsView::mouseMoveEvent(event) in your reipmlementation code of mouseMoveEvent. Thus your extended QGraphicsView's mouseMoveEvent is able to act like orginal QGraphicsView's mouseMoveEvent.