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Thread: QWidget layout problems

  1. 12th January 2010, 07:36 #1
    MarkoSan's Avatar
    MarkoSan
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    Default QWidget layout problems

    Hi to all!

    I have a problem that I cannot crack. I have subclassed QWidget with some QLabels and some QPushButtons and several layouts with qwidget main layout, which is set by setLayout method at the end of subclassed QWidget constructor. And I have no idea, why the GUI elements inside subclassed QWidget are not layouted. Here is header file:
    Qt Code: 
    1. #ifndef MERCHANDISETABLEDELEGATEWIDGET_H
    2. #define MERCHANDISETABLEDELEGATEWIDGET_H
    3.  
    4. // system includes
    5. #include <QtGui/QWidget>
    6. #include <QtGui/QHBoxLayout>
    7. #include <QtGui/QVBoxLayout>
    8. #include <QtGui/QLabel>
    9. #include <QtGui/QPushButton>
    10. #include <QtGui/QIcon>
    11. #include <QtGui/QPixmap>
    12. #include <QtCore/QSize>
    13.  
    14. // custom includes
    15.  
    16. // constants
    17. static const quint64 ICON_WIDTH=48;
    18. static const quint64 ICON_HEIGHT=48;
    19. static const quint64 DELTA=24;
    20.  
    21. static const quint64 DELAY_AUTO_REPEAT=300;
    22. static const quint64 DELAY_AUTO_REPEAT_INTERVAL=100;
    23.  
    24. class MerchandiseTableDelegateWidget : public QWidget
    25. {
    26. Q_OBJECT
    27.  
    28. public:
    29.     explicit MerchandiseTableDelegateWidget(QWidget* parent=0);
    30.  
    31. /*
    32.     inline QSize sizeHint() const
    33.         { return QSize(348, 348); }
    34. */
    35.  
    36.     inline QVBoxLayout* textLayout() const
    37.         { return m_pTextLayout; }
    38.     inline QHBoxLayout* priceLayout() const
    39.         { return m_pPriceLayout; }
    40.     inline QVBoxLayout* operationsLayout() const
    41.         { return m_pOperationsLayout; }
    42.     inline QHBoxLayout* mainLayout() const
    43.         { return m_pMainLayout; }
    44.  
    45.     inline QPixmap* merchandisePic() const
    46.         { return m_pMerchandisePic; }
    47.  
    48.     inline QLabel* merchandiseName() const
    49.         { return m_pMerchandiseName; }
    50.     inline QLabel* merchandiseDescription() const
    51.         { return m_pMerchandiseDescription; }
    52.     inline QLabel* merchandisePrice() const
    53.         { return m_pMerchandisePrice; }
    54.     inline QLabel* merchandiseQuantity() const
    55.         { return m_pMerchandiseQuantity; }
    56.     inline QLabel* merchandiseSubtotal() const
    57.         { return m_pMerchandiseSubtotal; }
    58.  
    59.     inline QPushButton* buttonIncreaseQuantity() const
    60.         { return m_pButtonIncreaseQuantity; }
    61.     inline QPushButton* buttonDecreaseQuantity() const
    62.         { return m_pButtonDecreaseQuantity; }
    63.     inline QPushButton* buttonTrash() const
    64.         { return m_pButtonTrash; }
    65.  
    66. private:
    67.     QVBoxLayout* m_pTextLayout;
    68.     QHBoxLayout* m_pPriceLayout;
    69.     QVBoxLayout* m_pOperationsLayout;
    70.     QHBoxLayout* m_pMainLayout;
    71.  
    72.     QPixmap* m_pMerchandisePic;
    73.  
    74.     QLabel* m_pMerchandiseName;
    75.     QLabel* m_pMerchandiseDescription;
    76.     QLabel* m_pMerchandisePrice;
    77.     QLabel* m_pMerchandiseQuantity;
    78.     QLabel* m_pMerchandiseSubtotal;
    79.  
    80.     QPushButton* m_pButtonIncreaseQuantity;
    81.     QPushButton* m_pButtonDecreaseQuantity;
    82.     QPushButton* m_pButtonTrash;
    83.  
    84. public slots:
    85.     void quantityIncrease();
    86.     void quantityDecrease();
    87.     void quantityZero();
    88. };
    89.  
    90. #endif // MERCHANDISETABLEDELEGATEWIDGET_H
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    And here is .cpp file:
    Qt Code: 
    1. #include "merchandisetabledelegatewidget.h"
    2.  
    3. MerchandiseTableDelegateWidget::MerchandiseTableDelegateWidget(QWidget* parent)
    4.     : QWidget(parent)
    5. {
    6.     m_pTextLayout=new QVBoxLayout();
    7.     Q_ASSERT_X(textLayout()!=0,
    8.                "Text Layout object allocation",
    9.                "Text Layout object could not be allocated.");
    10.  
    11.     m_pMerchandiseName=new QLabel(this);
    12.     Q_ASSERT_X(merchandiseName()!=0,
    13.                "Merchandise name label object allocation",
    14.                "Merchandise name label object could not be allocated.");
    15.  
    16.     m_pMerchandiseDescription=new QLabel(this);
    17.     Q_ASSERT_X(merchandiseDescription()!=0,
    18.                "Merchandise description label object allocation",
    19.                "Merchandise description label object could not be allocated.");
    20.  
    21.     textLayout()->addWidget(merchandiseName());
    22.     textLayout()->addWidget(merchandiseDescription());
    23.  
    24.     m_pPriceLayout=new QHBoxLayout();
    25.     Q_ASSERT_X(priceLayout()!=0,
    26.                "Price layout object allocation",
    27.                "Price layout object could not be allocated.");
    28.  
    29.     m_pMerchandisePrice=new QLabel(this);
    30.     Q_ASSERT_X(merchandisePrice()!=0,
    31.                "Merchandise price label object allocation",
    32.                "Merchandise price label object could not be allocated.");
    33.  
    34.     m_pMerchandiseQuantity=new QLabel(this);
    35.     Q_ASSERT_X(merchandiseQuantity()!=0,
    36.                "Merchandise quantity label object allocation",
    37.                "Merchandise quantity label object could not be allocated.");
    38.  
    39.     m_pMerchandiseSubtotal=new QLabel(this);
    40.     Q_ASSERT_X(merchandiseSubtotal()!=0,
    41.                "Merchandise subtotal label object allocation",
    42.                "Merchandise subtotal label object could not be allocated.");
    43.  
    44.     priceLayout()->addWidget(merchandisePrice());
    45.     priceLayout()->addWidget(merchandiseQuantity());
    46.     priceLayout()->addWidget(merchandiseSubtotal());
    47.  
    48.     textLayout()->addLayout(priceLayout());
    49.  
    50.     m_pOperationsLayout=new QVBoxLayout();
    51.     Q_ASSERT_X(operationsLayout()!=0,
    52.                "Operations layout object allocation",
    53.                "Operations layout could not be allocated.");
    54.  
    55.     m_pButtonIncreaseQuantity=new QPushButton(QIcon(":/delegateIcons/quaInc"),
    56.                                               tr(""),
    57.                                               this);
    58.     Q_ASSERT_X(buttonIncreaseQuantity()!=0,
    59.                "Increase quantity pushbutton object allocation",
    60.                "Increase quantity pushbutton object could not be allocated.");
    61.  
    62.     buttonIncreaseQuantity()->setSizePolicy(QSizePolicy::Fixed,
    63.                                             QSizePolicy::Fixed);
    64.     buttonIncreaseQuantity()->setIconSize(QSize(ICON_WIDTH,
    65.                                                 ICON_HEIGHT));
    66.     buttonIncreaseQuantity()->setAutoRepeat(true);
    67.     connect(buttonIncreaseQuantity(),
    68.             SIGNAL(clicked()),
    69.             this,
    70.             SLOT(quantityIncrease()));
    71.  
    72.     m_pButtonDecreaseQuantity=new QPushButton(QIcon(":/delegateIcons/quaDec"),
    73.                                               tr(""),
    74.                                               this);
    75.     Q_ASSERT_X(buttonDecreaseQuantity()!=0,
    76.                "Decrease quantity pushbutton object allocation",
    77.                "Decrease quantity pushbutton object could not be allocated.");
    78.  
    79.     buttonDecreaseQuantity()->setSizePolicy(QSizePolicy::Fixed,
    80.                                             QSizePolicy::Fixed);
    81.     buttonDecreaseQuantity()->setIconSize(QSize(ICON_WIDTH,
    82.                                                 ICON_HEIGHT));
    83.     buttonDecreaseQuantity()->setAutoRepeat(true);
    84.     connect(buttonDecreaseQuantity(),
    85.             SIGNAL(clicked()),
    86.             this,
    87.             SLOT(quantityDecrease()));
    88.  
    89.     m_pButtonTrash=new QPushButton(QIcon(":/delegateIcons/quaZereo"),
    90.                                    tr(""),
    91.                                    this);
    92.     Q_ASSERT_X(buttonTrash()!=0,
    93.                "Trash pushbutton object allocation",
    94.                "Trash pushbutton object could not be allocated.");
    95.  
    96.     buttonTrash()->setSizePolicy(QSizePolicy::Fixed,
    97.                                  QSizePolicy::Fixed);
    98.     buttonTrash()->setIconSize(QSize(ICON_WIDTH,
    99.                                      ICON_HEIGHT));
    100.     buttonTrash()->setAutoRepeat(false);
    101.     connect(buttonTrash(),
    102.             SIGNAL(clicked()),
    103.             this,
    104.             SLOT(quantityZero()));
    105.  
    106.     m_pMainLayout=new QHBoxLayout();
    107.     Q_ASSERT_X(mainLayout()!=0,
    108.                "Main layout object allocation",
    109.                "Main layout object could not be allocated");
    110.  
    111.     m_pMerchandisePic=new QPixmap(ICON_WIDTH+DELTA,
    112.                                   ICON_HEIGHT+DELTA);
    113.     Q_ASSERT_X(merchandisePic()!=0,
    114.                "Merchandise pic object allocation",
    115.                "Merchandise pic object could not be allocated.");
    116.  
    117. //    mainLayout()->addWidget(merchandisePic());
    118.     mainLayout()->addLayout(textLayout());
    119.     mainLayout()->addLayout(operationsLayout());
    120.  
    121.     setLayout(mainLayout());
    122. }
    123.  
    124. void MerchandiseTableDelegateWidget::quantityIncrease()
    125. {
    126. }
    127.  
    128. void MerchandiseTableDelegateWidget::quantityDecrease()
    129. {
    130. }
    131.  
    132. void MerchandiseTableDelegateWidget::quantityZero()
    133. {
    134. }
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    Can someone please help me, why layoutng is not working, because I have no idea and I am losing mind.

    Thank all of you in advance,
    Marko
    Qt 5.3 Opensource & Creator 3.1.2
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  2. 12th January 2010, 09:06 #2
    high_flyer
    high_flyer is offline Wiseguy
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    Default Re: QWidget layout problems

    Try the following, just before
    Qt Code: 
    1. setLayout(mainLayout());
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    Qt Code: 
    1. QLayout *pOldLayout = this->layout();
    2. if(pOldLayout) delete pOldLayout;
    3.  setLayout(mainLayout());
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    ==========================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.
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  3. 12th January 2010, 09:44 #3
    MarkoSan's Avatar
    MarkoSan
    MarkoSan is offline Advanced user
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    Default Re: QWidget layout problems

    No effect, I also placed breakpoint on if clause, delete statement is skipped.
    Qt 5.3 Opensource & Creator 3.1.2
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  4. 12th January 2010, 10:23 #4
    numbat
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    Default Re: QWidget layout problems

    You haven't added the buttons to any layout. The labels lay out fine on my machine.
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