C++/Qt4 - QTextEdit - textChanged slot - Question

[jimbo]

Hello,

In the QTextEdit the cursor is positioned at the end of the first line of the text, as its supposed to be.
However, if I then press the backspace key, the textChanged() slot gets called twice.
I don't understand why. Perhaps someone could explain.
With text and punctuation keys, the slot gets called once.
Its not a problem for me, I'd just like to know why.
Thanks in advance.

Regards

void menu::textButton() // slot
{
    if (cm::subSelected == -1) {
        cr::message("Select an item", "Error", 2);
        return;
    }
   prop = new propForm(this);
}

void menu::textButton() // slot
{
    if (cm::subSelected == -1) {
        cr::message("Select an item", "Error", 2);
        return;
    }
   prop = new propForm(this);
}

To copy to clipboard, switch view to plain text mode 

void menu::editButton() // slot
{
    prop->data->setReadOnly(false);
    prop->data->activateWindow();
    prop->data->moveCursor(QTextCursor::Start);
    prop->data->moveCursor(QTextCursor::EndOfBlock); //end of first line
    prop->data->ensureCursorVisible();
    QWidget *thisOne = QApplication::activeWindow();
    qDebug() << thisOne;
    qDebug() << thisOne->isTopLevel();
    qDebug() << thisOne->isActiveWindow();
}

void menu::editButton() // slot
{
    prop->data->setReadOnly(false);
    prop->data->activateWindow();
    prop->data->moveCursor(QTextCursor::Start);
    prop->data->moveCursor(QTextCursor::EndOfBlock); //end of first line
    prop->data->ensureCursorVisible();
    QWidget *thisOne = QApplication::activeWindow();
    qDebug() << thisOne;
    qDebug() << thisOne->isTopLevel();
    qDebug() << thisOne->isActiveWindow();
}

To copy to clipboard, switch view to plain text mode 

propForm.cpp
 
    data = new QTextEdit(this);
    data->setGeometry(0, filePath->height(), this->width(), this->height() - filePath->height());
 
    QString fileName = (cm::mainItem + "/" + cm::subItem);
    filePath->setText(fileName);
 
    QFile file(fileName);
 
    if ( ! (file.open(QIODevice::ReadWrite))) {
        cr::message("Can't open file.", "Error", 2);
        return;
    }
 
    QTextStream in(&file);
    while ( ! in.atEnd()) data->append(in.readLine());
    file.close();
 
    data->setReadOnly(true);
    connect (data, SIGNAL(textChanged()), this, SLOT(textChanged()));
    this->show();

propForm.cpp

    data = new QTextEdit(this);
    data->setGeometry(0, filePath->height(), this->width(), this->height() - filePath->height());

    QString fileName = (cm::mainItem + "/" + cm::subItem);
    filePath->setText(fileName);

    QFile file(fileName);

    if ( ! (file.open(QIODevice::ReadWrite))) {
        cr::message("Can't open file.", "Error", 2);
        return;
    }

    QTextStream in(&file);
    while ( ! in.atEnd()) data->append(in.readLine());
    file.close();

    data->setReadOnly(true);
    connect (data, SIGNAL(textChanged()), this, SLOT(textChanged()));
    this->show();

To copy to clipboard, switch view to plain text mode 

void propForm::textChanged() // private slot
{
    qDebug() << "text changed";
}

void propForm::textChanged() // private slot
{
    qDebug() << "text changed";
}

To copy to clipboard, switch view to plain text mode 

Output
 
menu(0x7ecc78f0) 
true 
true 
text changed 
text changed

Output

menu(0x7ecc78f0) 
true 
true 
text changed 
text changed

To copy to clipboard, switch view to plain text mode