Reimplementing The MousePressEvent for Graphics Item

[ashishrai]

Hi,
When I try to re-implement the mouse press event for a graphics item for which I had set the flag ItemIsMovable, I get some un-orderly behaviour.
The code is pasted at : http://rafb.net/p/iTwlPj79.html

Thanks in Advance!!

[jpn]

Could you be more precise, what is "some un-orderly behaviour"?

PS. Next time post the code here instead of linking to external sites, please.

[ashishrai]

Ok!!
I am posting the code here

#ifndef __ITEM_H__
#define __ITEM_H__
 
#include <QtGui>
#include <Qt>
#include <QGraphicsPolygonItem>
#include <QGraphicsItem>
#include <QGraphicsScene>
#include <QPolygonF>
 
 
 
 
class myitem : public QGraphicsPolygonItem 
 
{
 
 
	public : 
			static int left_mouse_button  ;
			myitem(float x,float y,QGraphicsItem *parent =0 ,QGraphicsScene *scene = 0); 
			QPolygonF mypolygon ;
 
	protected :
			    void mouseReleaseEvent(QGraphicsSceneMouseEvent *mouseEvent);
			    void mousePressEvent(QGraphicsSceneMouseEvent *mouseevent);
			//    void keyPressEvent(QKeyEvent *keyevent); 
 
 
};
 
 
 
#endif // __ITEM_H__

#ifndef __ITEM_H__
#define __ITEM_H__
 
#include <QtGui>
#include <Qt>
#include <QGraphicsPolygonItem>
#include <QGraphicsItem>
#include <QGraphicsScene>
#include <QPolygonF>
 
 
 
 
class myitem : public QGraphicsPolygonItem 
 
{
 
 
	public : 
			static int left_mouse_button  ;
			myitem(float x,float y,QGraphicsItem *parent =0 ,QGraphicsScene *scene = 0); 
			QPolygonF mypolygon ;
 
	protected :
			    void mouseReleaseEvent(QGraphicsSceneMouseEvent *mouseEvent);
			    void mousePressEvent(QGraphicsSceneMouseEvent *mouseevent);
			//    void keyPressEvent(QKeyEvent *keyevent); 
 
 
};
 
 
 
#endif // __ITEM_H__

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void	myitem::mouseReleaseEvent(QGraphicsSceneMouseEvent *mouseEvent)
	{  	   
		 //   if (mouseEvent->button() == Qt::LeftButton)
         //	myitem::left_mouse_button = 0 ;
 
 
        	 QGraphicsItem::mouseReleaseEvent(mouseEvent);
 
	}
 
 void myitem::mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent)
 {    	   
 			   // if (mouseEvent->button() == Qt::LeftButton)
               // myitem::left_mouse_button = 1 ;
             QGraphicsItem::mouseMoveEvent(mouseEvent);
 
	}

void	myitem::mouseReleaseEvent(QGraphicsSceneMouseEvent *mouseEvent)
	{  	   
		 //   if (mouseEvent->button() == Qt::LeftButton)
         //	myitem::left_mouse_button = 0 ;
 
 
        	 QGraphicsItem::mouseReleaseEvent(mouseEvent);
 
	}
 
 void myitem::mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent)
 {    	   
 			   // if (mouseEvent->button() == Qt::LeftButton)
               // myitem::left_mouse_button = 1 ;
             QGraphicsItem::mouseMoveEvent(mouseEvent);
 
	}

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The first time I move the item , it moves but the next time it starts moving from (it feels to me) a random position closer to the point from where it should start and later it disappers though I do not have a single line where I call hide.
I feel its got to do something with the flag. Couldnt find a clue

[jpn]

I suppose that call to mouseMoveEvent() in your mousePressEvent() implementation is unintentional.