update tab's title when contents change

[alexei]

Hello,

I'm building (or rather playing with) a Qt 4.7 app which basically consists of a window that contains a menu bar, a tab widget and a status bar. Each tab in the tab widgets contains a plain text editor. So basically, it's a tabbed plain text editor
Until now, I've managed to get it to create/open/save/close files, however, I haven't been able to change the tab text when the contents of the QPlainTextEdit change. It's simple when I open/save the file, but I don't know how to do it otherwise.
Any ideas?
In a SDI app I would normally do something like:

connect(textEdit->document(), SIGNAL(contentsChanged()), this, SLOT(documentWasModified()));

connect(textEdit->document(), SIGNAL(contentsChanged()), this, SLOT(documentWasModified()));

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but in this case, the text editor is no longer the central widget.
I've tried (in the newFile method):

EditorTab *editorTab = new EditorTab;
    int tabIndex = tabWidget->addTab(
            editorTab,
            editorTab->currentTitle
        );
    tabWidget->setCurrentIndex(tabIndex);
    connect(
            editorTab->document(),
            SIGNAL(contentsChanged()),
            this,
            SLOT(documentWasModified(tabIndex))
        );
    editorTab->setFocus();

EditorTab *editorTab = new EditorTab;
    int tabIndex = tabWidget->addTab(
            editorTab,
            editorTab->currentTitle
        );
    tabWidget->setCurrentIndex(tabIndex);
    connect(
            editorTab->document(),
            SIGNAL(contentsChanged()),
            this,
            SLOT(documentWasModified(tabIndex))
        );
    editorTab->setFocus();

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documentWasModified is:

qDebug("Tab %d changed", tabIndex);
    tabWidget->setTabText(tabIndex, "CHANGED");

qDebug("Tab %d changed", tabIndex);
    tabWidget->setTabText(tabIndex, "CHANGED");

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And the result is

Object::connect: No such slot MainWindow::documentWasModified(tabIndex) in ..\tabbedtextedit\mainwindow.cpp:85

Object::connect: No such slot MainWindow::documentWasModified(tabIndex) in ..\tabbedtextedit\mainwindow.cpp:85

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[JohannesMunk]

Well the QObject warning says it all. Your documentWasModified is not properly declared (as slot).

You can't connect slots which require a parameter to a signal that doesn't give one!

Make sure it looks something like this:

class MainWindow : ..
{   Q_OBJECT
public:
     ...
protected slots:
    void documentWasModified();
 
};
 
void MainWindow::documentWasModified()
{
    // get the tab index from your tabwidget currentIndex..
}

class MainWindow : ..
{   Q_OBJECT
public:
     ...
protected slots:
    void documentWasModified();

};

void MainWindow::documentWasModified()
{
    // get the tab index from your tabwidget currentIndex..
}

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HIH

Johannes

[alexei]

Makes sense, thanks!

[Ginsengelf]

connect(editorTab->document(), SIGNAL(contentsChanged()), this, SLOT(documentWasModified(tabIndex)));

connect(editorTab->document(), SIGNAL(contentsChanged()), this, SLOT(documentWasModified(tabIndex)));

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Hi, this won't work because you cannot pass arguments in the connect call. QSignalMapper might be helpful.

Ginsengelf