odd failure while adding custom widgets to QDockWidget

[sai]

I want to add several widgets to a single dockwidget.
As the QDockWidget owns no "addWidget" function, I managed to add a widgetForDock widget to it using "setWidget" function, and make other widgets children of the widgetForDock.

eg:

dockWidget->setWidget(widgetForDock);

dockWidget->setWidget(widgetForDock);

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It works well, when I make it through toward the Qt widgets, such as QLineEdit and QGroupBox. However, when I add my own object of class HistogramView, derived from QWidget, it fails to show.

eg: fail

QVBoxLayout *layout = new QVBoxLayout(widgetForDock);
HistogramView *histView = new HistogramView();
layout->addWidget(histView);
 
class HistogramView : public QWidget
{
...
public:
    HistogramPlotter *histPlotter;
   QWidget *widget;
}

QVBoxLayout *layout = new QVBoxLayout(widgetForDock);
HistogramView *histView = new HistogramView();
layout->addWidget(histView);

class HistogramView : public QWidget
{
...
public:
    HistogramPlotter *histPlotter;
   QWidget *widget;
}

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The even odder thing is that, when I add the object histView itselft to the dockWidget, it fails, while the public members (histPlotter and widget) are added to it, it works well!

eg: works!

layout->addWidget(histView->histPlotter);
layout->addWidget(histView->widget);

layout->addWidget(histView->histPlotter);
layout->addWidget(histView->widget);

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The HistogramPlotter is a cumter widget, also derived from the QWidget, just as its owner object do.

[jacek]

Does this custom widget work OK if you add it to a normal widget? Could you post the HistogramView::HistogramView() code?

[sai]

Thanks a lot for your care.
I've tried to put HistogramView's object into QGroupBox's layout, and it follows the same problem:
when HistogramView's object itself added in , it fails, while the public member added in , it works well !

class HistogramView : public QWidget 
{
	Q_OBJECT
public:
	HistogramView(QWidget *parent = 0);
	HistogramView(const QImage &image, QWidget *parent = 0);
signals:
...
private slots:
...        
public:
HistogramPlotter *histPlotter;
QWidget *widget;
...
}

class HistogramView : public QWidget 
{
	Q_OBJECT
public:
	HistogramView(QWidget *parent = 0);
	HistogramView(const QImage &image, QWidget *parent = 0);
signals:
...
private slots:
...        
public:
HistogramPlotter *histPlotter;
QWidget *widget;
...
}

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[jacek]

What do you do with "parent" in the constructor?

[sai]

it's passed to the object's parent, QWidget, for initialization