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Thread: not drag and drop on a QGraphicsTextItem

  1. #1
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    Default not drag and drop on a QGraphicsTextItem

    Hi, I'm trying to solve a problem I was postponing during too much time and now I'm out of ideas.

    I have a subclassed QGraphicsTextItem that only receives the drag and drop event when "mousePressEvent" is not implemented. Everything, everything works perfectly (edit text, change the font...) but drag&drop.

    Qt Code:
    1. #pragma once
    2. #ifndef ITEXTOITEM_H
    3. #define ITEXTOITEM_H
    4.  
    5. #include "Common/TextoItem.h"
    6. #include <QMenu>
    7.  
    8. class CITextoItem : public CTextoItem //CTextoItem inherits from QGraphicsTextItem
    9. {
    10. Q_OBJECT
    11.  
    12. public:
    13. CITextoItem();
    14. ~CITextoItem();
    15.  
    16. private:
    17. void mousePressEvent(QGraphicsSceneMouseEvent *event);
    18.  
    19. QMenu* m_pMenu;
    20.  
    21. private slots:
    22. void menuClicked(QAction* pAction);
    23. };
    24.  
    25. #endif //ITEXTOITEM
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    Qt Code:
    1. void CITextoItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
    2. {//it should work...
    3. QGraphicsItem::mousePressEvent(event);
    4. }
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    just in case, the father's class
    Qt Code:
    1. #pragma once
    2. #ifndef TEXTOITEM_H
    3. #define TEXTOITEM_H
    4.  
    5. #include "FormElemItem.h"
    6. #include <QGraphicsTextItem>
    7. #include <QObject>
    8.  
    9. class CTextoItem : public QGraphicsTextItem
    10. {
    11. Q_OBJECT
    12.  
    13. public:
    14. enum { Type = UserType + 5 };
    15. int type() const
    16. {
    17. // Enable the use of qgraphicsitem_cast with this item.
    18. return Type;
    19. }
    20.  
    21. CTextoItem();
    22. ~CTextoItem();
    23. };
    24.  
    25. #endif //TEXTOITEM_H
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    It doesn't mind the code I have inside the mousePressEvent function, drag&drop doesn't work if the function is implemented and it works perfectly if I remove it.

    Do you have any clue? right now, I'm out of ideas.

    thanks!

  2. #2
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    Default Re: not drag and drop on a QGraphicsTextItem

    mousePressEvent() should be public
    ==========================signature=============== ==================
    S.O.L.I.D principles (use them!):
    https://en.wikipedia.org/wiki/SOLID_...iented_design)

    Do you write clean code? - if you are TDD'ing then maybe, if not, your not writing clean code.

  3. The following user says thank you to high_flyer for this useful post:

    jano_alex_es (19th October 2009)

  4. #3
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    Default Re: not drag and drop on a QGraphicsTextItem

    it does not work either...

    Should be always public? visual-studio/Qt implements it as private by default. By the way, I can edit the text and it receives events, everything ok but drag&dropping.
    Last edited by jano_alex_es; 19th October 2009 at 08:17.

  5. #4
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    Default Re: not drag and drop on a QGraphicsTextItem

    Try to make it protected (that's what I use allways...) and
    Qt Code:
    1. void CITextoItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
    2. {
    3. QGraphicsTextItem::mousePressEvent(event);
    4. // or if that don't work
    5. // CTextoItem::mousePressEvent(event);
    6. }
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  6. The following user says thank you to Lykurg for this useful post:

    jano_alex_es (19th October 2009)

  7. #5
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    Default Re: not drag and drop on a QGraphicsTextItem

    thanks! calling the function from the child, works...

    Now I'm checking the Qt code and yes, some graphics item have a different implementations of those supposed inherited members :S In my opinion, and it's just my opinion, this is a terrible mistake in the Qt Assistant, because I assume "QGraphicsTextItem" calls directly its parent's function.

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