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

[caduel]

try not passing componentArea as parent when you create that QMdiSubWindow

[scascio]

Why not inherit directly from QMdiSubWindow instead of adding a new QMdiSubWindow initialized with a QFrame?
QMdiSubWindow does not have all the features of the QFrame?

class TextEditor : public QMdiSubWindow {
    Q_OBJECT
 
	public:
		TextEditor(QWidget *parent = 0):QMdiSubWindow(parent) {
			setAttribute(Qt::WA_DeleteOnClose);
			m_text = new QTextEdit;
			layout()->addWidget(m_text);
		}
		~TextEditor() {
		}
 
	private:
		QWidget * m_text;
};

class TextEditor : public QMdiSubWindow {
    Q_OBJECT

	public:
		TextEditor(QWidget *parent = 0):QMdiSubWindow(parent) {
			setAttribute(Qt::WA_DeleteOnClose);
			m_text = new QTextEdit;
			layout()->addWidget(m_text);
		}
		~TextEditor() {
		}

	private:
		QWidget * m_text;
};

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class MDITextEditor : public QMainWindow {
    Q_OBJECT
 
	public:
 
		MDITextEditor(QWidget *parent = 0):QMainWindow(parent) {
			m_area = new QMdiArea;
			setCentralWidget(m_area);
			createActions();
			createMenus();
		}
 
		~MDITextEditor(){
		}
 
	public slots:
		void newSubWindow();
 
	private:
 
		QMdiArea * m_area;
		QAction * m_new;
		QMenu * m_menu;
 
		void createActions() {
			m_new = new QAction(this);
			m_new->setText(tr("New..."));
			connect(m_new, SIGNAL(triggered()), this, SLOT(newSubWindow()));
		}
		void createMenus() {
			m_menu = new QMenu(tr("File"));
			m_menu->addAction(m_new);
			menuBar()->addMenu(m_menu);
		}
};
inline void MDITextEditor::newSubWindow(){
	TextEditor * textEditor = new TextEditor;
	m_area->addSubWindow(textEditor);
	textEditor->show();
}

class MDITextEditor : public QMainWindow {
    Q_OBJECT

	public:

		MDITextEditor(QWidget *parent = 0):QMainWindow(parent) {
			m_area = new QMdiArea;
			setCentralWidget(m_area);
			createActions();
			createMenus();
		}

		~MDITextEditor(){
		}

	public slots:
		void newSubWindow();

	private:

		QMdiArea * m_area;
		QAction * m_new;
		QMenu * m_menu;

		void createActions() {
			m_new = new QAction(this);
			m_new->setText(tr("New..."));
			connect(m_new, SIGNAL(triggered()), this, SLOT(newSubWindow()));
		}
		void createMenus() {
			m_menu = new QMenu(tr("File"));
			m_menu->addAction(m_new);
			menuBar()->addMenu(m_menu);
		}
};
inline void MDITextEditor::newSubWindow(){
	TextEditor * textEditor = new TextEditor;
	m_area->addSubWindow(textEditor);
	textEditor->show();
}

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