Hi all,

There is two GraphicObjects. Both have mousepressevent and also needed to be seen in a QGraphicsScene. The first GraphicObjects(let say A), when user clicks on it the second GraphicObjects(let say B) will be painted on the QGraphicScene while A still remain in the scene. But when user clicks on B the object A will be deleted together with B after being clicked. I use SIGNAL & SLOT to implement this which can only work for 1 pair. It became chaotic when there is plenty of object A in the scene. Please help me. I write down a pseudo code below.

Qt Code: 
  1. class A
  2. {
  3.  paint()//paints  the object
  4.  mousePressEvent
  5.  {
  6.    emit drawBtn//emit signal
  7.  }
  8. }
  9.  
  10. class B
  11. {
  12.   mousePressEvent
  13.   {
  14.     emit DestroyA
  15.     emit DestroySelf
  16.   }
  17. }
  18.  
  19. class Widget
  20. {
  21.   Widget()
  22.   {
  23.    scene = new QGraphicsScene
  24.    view = new QGraphicsView
  25.    createA();//this one only work once.
  26.  
  27.   }
  28.  
  29.   void createA()
  30.   {
  31.     //create classA and add to the scene
  32.     connect(A, SIGNAL(drawBtn()),this,SLOT(drawTheBtn())
  33.   }
  34.   void drawTheBtn()
  35.   {
  36.     //create classB and add to the scene
  37.     connect(B, SIGNAL(destroyA()),A,SLOT(deleteLater())
  38.     connect(B, SIGNAL(destroySelf(),B,SLOT(deleteLater())
  39.   }
  40.  
  41. }
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