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Thread: Move QGraphicsScene by mouse

  1. #1
    Join Date
    Jul 2010
    Posts
    1
    Qt products
    Qt4
    Platforms
    Windows Symbian S60

    Question Move QGraphicsScene by mouse

    HI!

    I want to move a scene with mouse (left mouse button with CTRL). I use this code:

    Qt Code:
    1. void GraphicsView::mousePressEvent (QMouseEvent *event)
    2. {
    3. if (event->button () == Qt::LeftButton && event->modifiers ().testFlag (Qt::ControlModifier))
    4. {
    5. setDragMode (QGraphicsView::ScrollHandDrag);
    6. setInteractive (false);
    7.  
    8. _originX = event->x ();
    9. _originY = event->y ();
    10. }
    11. else
    12. {
    13. QGraphicsView::mousePressEvent (event);
    14. }
    15. }
    16.  
    17. void GraphicsView::mouseMoveEvent (QMouseEvent *event)
    18. {
    19. if (event->buttons () & Qt::LeftButton && event->modifiers ().testFlag (Qt::ControlModifier))
    20. {
    21. QPointF oldp = mapToScene (_originX, _originY);
    22. QPointF newp = mapToScene (event->pos ());
    23. QPointF translation = newp - oldp;
    24.  
    25. translate (translation.x (), translation.y ());
    26.  
    27. _originX = event->x ();
    28. _originY = event->y ();
    29. return;
    30. }
    31.  
    32. QGraphicsView::mouseMoveEvent (event);
    33. }
    34.  
    35. void GraphicsView::mouseReleaseEvent (QMouseEvent *event)
    36. {
    37. if (event->button () == Qt::LeftButton && event->modifiers ().testFlag (Qt::ControlModifier))
    38. {
    39. setDragMode (QGraphicsView::NoDrag);
    40. setInteractive (true);
    41. }
    42. else
    43. {
    44. QGraphicsView::mouseReleaseEvent (event);
    45. }
    46. }
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    And this code is not work.

  2. #2
    Join Date
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    Default Re: Move QGraphicsScene by mouse

    Is the scene larger than the view?
    Your biological and technological distinctiveness will be added to our own. Resistance is futile.

    Please ask Qt related questions on the forum and not using private messages or visitor messages.


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