QMdiArea / SubWindow Problem

[ericV]

Hi,

I am currently working on an MDIbased Project.

I ahve set up an MDI area, and am working on adding different widgets to it.

But i am having problems with one of my Widgets. It is a custom codeeditor widget subclassed from QFrame, that contains a QTextEdit and a QWidget in which i draw the linenumbers.

"My Editor Constructor"

TextEditorWidget::TextEditorWidget(QWidget *parent,const QString &file)
    : QFrame(parent)
{
    setFrameStyle(QFrame::StyledPanel|QFrame::Sunken);
    setMidLineWidth(2);
 
    editor = new QTextEdit(this);
    editor->setAcceptRichText(true);
...
    lineNumbers = new LineNumbers(this);
 
    QHBoxLayout *editorLayout = new QHBoxLayout;
    editorLayout->setSpacing(0);
    editorLayout->addWidget(lineNumbers);
    editorLayout->addWidget(editor);
    editorLayout->setContentsMargins(0,0,0,0);
 
    this->setLayout(editorLayout);
...

TextEditorWidget::TextEditorWidget(QWidget *parent,const QString &file)
    : QFrame(parent)
{
    setFrameStyle(QFrame::StyledPanel|QFrame::Sunken);
    setMidLineWidth(2);

    editor = new QTextEdit(this);
    editor->setAcceptRichText(true);
...
    lineNumbers = new LineNumbers(this);

    QHBoxLayout *editorLayout = new QHBoxLayout;
    editorLayout->setSpacing(0);
    editorLayout->addWidget(lineNumbers);
    editorLayout->addWidget(editor);
    editorLayout->setContentsMargins(0,0,0,0);

    this->setLayout(editorLayout);
...

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"My add to MDIarea method"

void MainWindow::createEditor()
{
    QMdiSubWindow *child = new QMdiSubWindow(componentArea);
    TextEditorWidget *editor = new TextEditorWidget(child);
 
    child->setWidget(editor);
    child->setAttribute(Qt::WA_DeleteOnClose);
 
    componentArea->addSubWindow(child);
    child->show();
}

void MainWindow::createEditor()
{
    QMdiSubWindow *child = new QMdiSubWindow(componentArea);
    TextEditorWidget *editor = new TextEditorWidget(child);

    child->setWidget(editor);
    child->setAttribute(Qt::WA_DeleteOnClose);

    componentArea->addSubWindow(child);
    child->show();
}

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I have done prety much the same with other widgets, but with this one i get the following problems/errors:

when the method is called the following apears on the console:
"QMdiArea::addSubWindow: window is already added"

and The window itself does not get painted properly at first, only after i move it it gets drawn properly. I have attached a screenshot with a before-and-after.

I just can't figure out why it's giving me problems with this widget, it works fine for a QListwidget subclass and other QFrame sublcasses.

Maybe someone has already encountered this problem and can point me in the right directions.

Thanks for reading.

Eric