Question

I am currently working on a code editor written in Qt,

I have managed to implement most of the features which I desire, i.e. auto completion and syntax highlighting but there is one problem which I can’t figure out.

I have created a model for which the QCompleter uses, which is fine for things like html tags and c++ keywords such as if else etc.

But I would like to add variables to the completer as they are entered by the user.

So I created an event on the QTextEdit which will get the word (I know I need to check to make sure that it is a variable etc but I just want to get it working for now).

void TextEdit::checkWord()
{
    //going to get the previous word and try to do something with it
    QTextCursor tc = textCursor();
    tc.movePosition(QTextCursor::PreviousWord);
    tc.select(QTextCursor::WordUnderCursor);
    QString word = tc.selectedText();
    //check to see it is in the model
}

But now I want to work out how to check to see if that word is already in the QCompleters model and if it isn’t how do I add it?

I have tried the following:

QAbstractItemModel *m = completer->model();
//dont know what to do with it now :(

Answer 1

You can check if word is in your QCompleter really by using

QAbstractItemModel *m = completer->model();

as you can see, method model() returns const pointer.

That is good for checking procedure, you can check like this:

bool matched = false;
QString etalon("second");
QStringListModel *strModel = qobject_cast<QStringListModel*>(completer.model());
if (strModel!=NULL)
    foreach (QString str, strModel->stringList()) {
        if (str == etalon)
        {
            matched = true;
            break;
        }
    }
qDebug()<<matched;

---

But for your purposes, I recommend you to declare QStringListModel, and connect it to your completer, and then, all of operations you’ll must do thru your model, according to Qt’s principles of MVC programming (http://doc.qt.digia.com/qt/model-view-programming.html).

Your code can be like this:

// declaration
QCompleter completer;
QStringListModel completerModel;

// initialization
completer.setModel(&completerModel);
QStringList stringListForCompleter;
stringListForCompleter << "first" << "second" << "third";
completerModel.setStringList(stringListForCompleter);

// adding new word to your completer list
completerModel.setStringList(completerModel.stringList() << "New Word");

Good luck!