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Thread: Detect when the content of a cell of QTableView is changed

  1. #1
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    Question Detect when the content of a cell of QTableView is changed

    Hi all,

    I need monitoring the changes in the data content of a cell of QTableView.

    I have a QTableView widget into QMainWindow.

    I have tried with the QAbstractItemView signals, the slots are called in my QMainWindow class, but neither of them accomplish the target that I need.

    I have tried with the currentChanged( const QModelIndex & current, const QModelIndex & previous ) signal of QItemSelectionModel, as above the slot is called, but itsn't accomplish the target that I need too.

    I make the connects like this:

    Qt Code:
    1. connect(ui->myTableView->selectionModel(), SIGNAL(currentChanged ( QModelIndex const&, QModelIndex const& )), this, SLOT(onCurrentChanged(QModelIndex con7st&, QModelIndex const&)));
    2. connect(ui->myTableView, SIGNAL(pressed(const QModelIndex &)), this, SLOT(onPressed(const QModelIndex &)));
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    There are any signal / slot / method or similar that I could use to accomplish my target?

    Best regards.

  2. #2
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    Default Re: Detect when the content of a cell of QTableView is changed

    You are looking in the wrong direction. To get a signal when the data changes you need to be looking at the data model not the view: QAbstractItemModel::dataChanged() for example.

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    Default Re: Detect when the content of a cell of QTableView is changed

    When i first started i tried QTableView and had endless problems myself

    I then switched to Qtable Widget. And cell changed events and so forth are much easier to use.

    Hope this helps

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    Thumbs up Re: Detect when the content of a cell of QTableView is changed

    Quote Originally Posted by ChrisW67 View Post
    You are looking in the wrong direction. To get a signal when the data changes you need to be looking at the data model not the view: QAbstractItemModel::dataChanged() for example.
    Hi ChrisW67,

    I have used this new code:

    Qt Code:
    1. connect(ui->myTableView->model(), SIGNAL(dataChanged(const QModelIndex&, const QModelIndex&)), this, SLOT(onDataChanged(const QModelIndex&, const QModelIndex&)));
    2.  
    3. ...
    4.  
    5. void myClass::onDataChanged(const QModelIndex& topLeft, const QModelIndex& bottomRight)
    6. {
    7. qDebug() << "the cell has changed";
    8. }
    To copy to clipboard, switch view to plain text mode 

    And works fine!

    Thank you.

  5. #5
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    Default Re: Detect when the content of a cell of QTableView is changed

    Quote Originally Posted by qt_developer View Post
    Hi ChrisW67,

    I have used this new code:

    Qt Code:
    1. connect(ui->myTableView->model(), SIGNAL(dataChanged(const QModelIndex&, const QModelIndex&)), this, SLOT(onDataChanged(const QModelIndex&, const QModelIndex&)));
    2.  
    3. ...
    4.  
    5. void myClass::onDataChanged(const QModelIndex& topLeft, const QModelIndex& bottomRight)
    6. {
    7. qDebug() << "the cell has changed";
    8. }
    To copy to clipboard, switch view to plain text mode 

    And works fine!

    Thank you.

    Hi can you give the whole code ?

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    Default Re: Detect when the content of a cell of QTableView is changed

    Hi can you give the whole code ?
    What you do in response to a dataChanged() signal is specific to your application. Any "whole code" for this thread would probably have no meaning in your application.

    I suggest you start with reading about Qt Model/View Programming in the documentation, look at the Model/View tutorial, and finally look at some of the 19 examples of Model/View programming that come with Qt.

    You will probably learn enough in that to understand how to use the QAbstractItemModel::dataChanged() signal in your own application.
    <=== The Great Pumpkin says ===>
    Please use CODE tags when posting source code so it is more readable. Click "Go Advanced" and then the "#" icon to insert the tags. Paste your code between them.

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