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Thread: Help me about QGridLayout and ScrollArea

  1. #1
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    Default Help me about QGridLayout and ScrollArea

    Please help me this problem.
    I using QGridLayout and array of QToolButton to display a array of images (Image is the icon of button). But the button (image) overlap...
    I want to display the array button in 3 columns....
    help me!
    Thanks!
    this is my code

    Qt Code:
    1. QDir currentImageDir(LibPath+"/"+dir);
    2. currentImageDir.setFilter(QDir::Files | QDir::NoSymLinks | QDir::NoDotAndDotDot);
    3. QStringList ImageEntries = currentImageDir.entryList();
    4.  
    5. singalImageMapper = new QSignalMapper(this);
    6. QGridLayout* gridEPG;
    7. QScrollArea *scrollArea = new QScrollArea();
    8. QWidget *contentsWidget = new QWidget(scrollArea);
    9. gridEPG = new QGridLayout(contentsWidget);
    10.  
    11. scrollArea->setWidgetResizable(true);
    12. scrollArea->setWidget(contentsWidget);
    13. contentsWidget->setLayout(gridEPG);
    14. contentsWidget->setMinimumSize(scrollArea->width(), scrollArea->height());
    15.  
    16. ui->imageLayout->addWidget(scrollArea, 1, 0, 2, 3);
    17. QString filename[ImageEntries.count()];
    18.  
    19. for (int x = 0; x < ImageEntries.count(); x++)
    20. {
    21. // int row = x;
    22. //int col = i%3;
    23. filename[x]= ImageEntries.at(x);
    24. QToolButton* button = new QToolButton();
    25. button->setToolButtonStyle(Qt::ToolButtonTextUnderIcon);
    26. button->setIcon(QIcon(LibPath + "/" + dir + "/" + filename[x]));
    27. button->setFixedSize(QSize(96,76));
    28. button->setIconSize(QSize(96,76));
    29. connect(button, SIGNAL(clicked()), singalImageMapper, SLOT(map()));
    30. singalImageMapper->setMapping(button, filename[x]);
    31. for(int i=0; i<3; i++)
    32. gridEPG->addWidget(button, x, i%3);
    33.  
    34. }
    35. ui->fileImgUsing->setText(QString(imgPath + "/" + dir));
    36. connect(singalImageMapper, SIGNAL(mapped(QString)),this, SIGNAL(clicked(QString)));
    37. connect(this, SIGNAL(clicked(QString)),this, SLOT(onButtonClicked(QString)));
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    and my result

    error.png

  2. #2
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    Default Re: Help me about QGridLayout and ScrollArea

    [QUOTE=homerux;248996]
    Qt Code:
    1. for(int i=0; i<3; i++)
    2. gridEPG->addWidget(button, x, i%3);
    To copy to clipboard, switch view to plain text mode 

    You are trying to put the same button object in each of three columns? If that is what you intend then you need to duplicate the button for each column (i.e. three different objects with the same image). If that is not what you intended then remove the for loop and change "i % 3" to " x % 3".

    Set the sizeConstraint() of the layout in the scroll area contents widget to QLayout::SetFixedSize and it should adjust the size of the contentsWidget to match the fixed size of the contained tool buttons.

  3. The following user says thank you to ChrisW67 for this useful post:

    homerux (12th August 2013)

  4. #3
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    Default Re: Help me about QGridLayout and ScrollArea

    [QUOTE=ChrisW67;249013]
    Quote Originally Posted by homerux View Post
    Qt Code:
    1. for(int i=0; i<3; i++)
    2. gridEPG->addWidget(button, x, i%3);
    To copy to clipboard, switch view to plain text mode 

    You are trying to put the same button object in each of three columns? If that is what you intend then you need to duplicate the button for each column (i.e. three different objects with the same image). If that is not what you intended then remove the for loop and change "i % 3" to " x % 3".

    Set the sizeConstraint() of the layout in the scroll area contents widget to QLayout::SetFixedSize and it should adjust the size of the contentsWidget to match the fixed size of the contained tool buttons.
    I want put a array of button in 3 columns in a scroll layout, but it not work. Can you help me?

  5. #4
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    Default Re: Help me about QGridLayout and ScrollArea

    Qt Code:
    1. #include <QtGui>
    2.  
    3. class Window: public QScrollArea
    4. {
    5. Q_OBJECT
    6. public:
    7. explicit Window(QWidget *p = 0): QScrollArea(p) {
    8. QWidget *contents = new QWidget(this);
    9.  
    10. QGridLayout *layout = new QGridLayout(this);
    11. for (int n = 0; n < 150; ++n) {
    12. QToolButton *b = new QToolButton(this);
    13. b->setIcon(qApp->style()->standardIcon(QStyle::SP_FileIcon));
    14. layout->addWidget(b, n / 3, n % 3);
    15. }
    16. contents->setLayout(layout);
    17.  
    18. setWidget(contents);
    19. }
    20. };
    21.  
    22. int main(int argc, char **argv)
    23. {
    24. QApplication app(argc, argv);
    25. Window w;
    26. w.resize(200, 200);
    27. w.show();
    28. return app.exec();
    29. }
    30. #include "main.moc"
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  6. The following user says thank you to ChrisW67 for this useful post:

    homerux (12th August 2013)

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