Why doesn't my dialog window close when the mainwindow is closed?

[pir]

Hi!

I have a problem with a dialog window that doesn't close when I close the MainWindow. The dialog isn't modal, because I want a window at the side of my main window that I can display state of the progam.

I've read about parents and childs and thought that a child is closed when it's parent is. So either I've got this wrong or I've failed making the dialog a child to the main window.

Heres a shortened version of the code:


This is the dialog class:

class OutlinerEditor : public QDialog
{
    Q_OBJECT
 
 
public:
 
    OutlinerEditor ( std::vector<Renderable*> *v,
		          std::vector<Renderable*> *s,
		          QWidget *parent ):
	QDialog ( parent )
	{
	    setWindowTitle ( "Outliner" );
 
	    treeModel = new TreeModel ( cmps );
 
	    outliner = new Outliner ( sels, this );
	    outliner->setModel ( treeModel );
	    outliner->connectSelection ( );
 
	    hLayout = new QHBoxLayout ( this );
	    hLayout->addWidget ( outliner );
 
	    hLayout->setMargin ( 1 );
	    setContentsMargins ( 1, 1, 1, 1 );
 
	    // and connections and so forth...
 
	}// OutlinerEditor(v*,v*,W*)
 
};// class OutlinerEditor

class OutlinerEditor : public QDialog
{
    Q_OBJECT
    
    
public:
    
    OutlinerEditor ( std::vector<Renderable*> *v,
		          std::vector<Renderable*> *s,
		          QWidget *parent ):
	QDialog ( parent )
	{
	    setWindowTitle ( "Outliner" );
	    
	    treeModel = new TreeModel ( cmps );
	    
	    outliner = new Outliner ( sels, this );
	    outliner->setModel ( treeModel );
	    outliner->connectSelection ( );
	    
	    hLayout = new QHBoxLayout ( this );
	    hLayout->addWidget ( outliner );
	    
	    hLayout->setMargin ( 1 );
	    setContentsMargins ( 1, 1, 1, 1 );

	    // and connections and so forth...
	    
	}// OutlinerEditor(v*,v*,W*)
    
};// class OutlinerEditor

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This is the MainWindow class:

class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    MainWindow::MainWindow ( ):
	QMainWindow ( )
	{
	    canvasFrame = new CanvasFrame;
 
	    /* This is where I build the dialog and connects it, the last argument is the
             * pointer to the parent.
             */
	    OutlinerEditor *outlinerEditor = new OutlinerEditor ( NULL, NULL, this );
 
	    /* This is how I show the dialog as not modal */
	    outlinerEditor->show   ( );
 
	}// MainWindow()
 
};// class MainWindow

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow::MainWindow ( ):
	QMainWindow ( )
	{
	    canvasFrame = new CanvasFrame;
	    
	    /* This is where I build the dialog and connects it, the last argument is the
             * pointer to the parent.
             */
	    OutlinerEditor *outlinerEditor = new OutlinerEditor ( NULL, NULL, this );
	    
	    /* This is how I show the dialog as not modal */
	    outlinerEditor->show   ( );
	    
	}// MainWindow()
    
};// class MainWindow

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thanks for reading
pir

[jpn]

Try to set attribute Qt::WA_DeleteOnClose for the main window. This assures that the main window is deleted upon closing and so the dialog should be destructed also.

[pir]

I thought that the MainWindow was set to this as default. Thanks, I will try that. It's good to know, but I solved the problem with implementing the closeEvent() and close down all dialogs there. I needed to save the state of the dialogs anyway...

But is the parent child relation ok?
Because I'm a bit unsure about how the destruction of the widgets work. Can't find it explained in detail on the homepage. According to what I've understaned , is the children automatically destructed when the parent is destructed. But what about orphins? Do I need to destroy them myself, or does Qt's main loop take care of this when I close down the Qt session?

thanks
pir

[wysota]

Because I'm a bit unsure about how the destruction of the widgets work.

If a QObject is destructed, it destroys all its children each of which in turn destroy all its children, etc.

But what about orphins? Do I need to destroy them myself, or does Qt's main loop take care of this when I close down the Qt session?

You have to destroy them yourself. Qt doesn't do anything *magic*, it's just a C++ library.