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Thread: Why the signal "dataChanged" by QTableWidget not work?

  1. #1

    Default Why the signal "dataChanged" by QTableWidget not work?

    Hello, I am modifying the example "Chart" so that when I change data in the table, another function "Display()" can be executed. Below is my modification to MainWindow.cpp (line #17 is added to the original code):
    Qt Code:
    1. MainWindow::MainWindow()
    2. {
    3. QMenu *fileMenu = new QMenu(tr("&File"), this);
    4. QAction *openAction = fileMenu->addAction(tr("&Open..."));
    5. openAction->setShortcuts(QKeySequence::Open);
    6. QAction *saveAction = fileMenu->addAction(tr("&Save As..."));
    7. saveAction->setShortcuts(QKeySequence::SaveAs);
    8. QAction *quitAction = fileMenu->addAction(tr("E&xit"));
    9. quitAction->setShortcuts(QKeySequence::Quit);
    10.  
    11. setupModel();
    12. setupViews();
    13.  
    14. connect(openAction, SIGNAL(triggered()), this, SLOT(openFile()));
    15. connect(saveAction, SIGNAL(triggered()), this, SLOT(saveFile()));
    16. connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
    17. connect (model,SIGNAL(dataChanged(const QModelIndex & topLeft, const QModelIndex & bottomRight)),this,SLOT(display(const QModelIndex & topLeft, const QModelIndex & bottomRight)));
    18. menuBar()->addMenu(fileMenu);
    19. statusBar();
    20.  
    21. openFile(":/Charts/qtdata.cht");
    22.  
    23. setWindowTitle(tr("Chart"));
    24. resize(870, 550);
    25. }
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    I am therefore expecting the following function written by my own (and added to prive slot in MainWindow.h) will be executed once I change data in the table view:
    Qt Code:
    1. void display(const QModelIndex & topLeft, const QModelIndex & bottomRight);
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    However, I found whatever I did to the data in the table view during execution of the main program, the display() function would never be triggered. Could anyone help me with this. I am using Qt 4.7 with visual studio 2008. Thank you very much.
    Last edited by wysota; 20th August 2011 at 10:35. Reason: missing [code] tags

  2. #2

    Default Re: Why the signal "dataChanged" by QTableWidget not work?

    I understand, It should be

    connect(model, SIGNAL(dataChanged ( const QModelIndex &, const QModelIndex & )),
    this, SLOT( backgroundChanged ( const QModelIndex & , const QModelIndex & )));

    Then it works.

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