Resize QMainwindow to fit Qdockwidget size - c++

Question

I have a QMainWindow and a QDockWidget nested inside this.
I show some graphs, so the QDockWidget expands but the QMainWindow keeps it's initial size so i have to resize it using my mouse.
So, how can i make a QMainWindow resize to QDockWidget size every time?

Answer 1

It was easy at the end.
I take the Qsize of my QDockWidgets and i resize my QMainWIndow to this.
For example i have 2 QDockWidget side by side so what i do is
QSize siz = Dock->size();
QSize siz2 = Dock2->size();
resize(siz.width()+siz2.width(),siz.height);

Answer 2

You might want to rewrite the resizeEvent function of the QDockWidget widget. For that you need to subclass QDockWidget.
class MYDockwidget : public QDockWidget
{
Q_OBJECT
public:
MYDockwidget(QWidget *parent = 0):
QDockWidget(parent)
{}
protected:
void resizeEvent(QResizeEvent *event)
{
QDockWidget::resizeEvent(event);
// Calulate Main window size here.
// the main window is accesible
// through the parent property.
}
};
This approach works, but binds the QDockWidget's resizeEvent to the QMainWindow. The proper solution is to emit a signal when the size of the QDockWidget change.
For that you will need to define a custom signal and of course you want that signal with information about the event in question, hence our signal will be emited with a QSize argument.
class MYDockwidget : public QDockWidget
{
Q_OBJECT
public:
MYDockwidget(QWidget *parent = 0):
QDockWidget(parent)
{}
signals:
void sizeChanged(QSize);
protected:
void resizeEvent(QResizeEvent *event)
{
QDockWidget::resizeEvent(event);
emit sizeChanged(event->size());
}
};
After that you can write code like:
// Inside your main window.
public slots:
void on_dock_size_changed(QSize)
MYDockwidget *dock = new MYDockwidget(this);
connect(dock, SIGNAL(sizeChanged(QSize)), this, SLOT(on_dock_size_changed(QSize)));
void on_dock_size_changed(QSize size)
{
// resize your main window here.
}
Disadvantage:
You will need to set the QDockWidget's properties by hand (programmatically) unless you manage your self to insert your custom widget as a QTDesigner plugin.