Creating new window understanding question

[jankoh]

Hi there,

I have a problem creating a new window from an existing one (this is most probably a dumb newbie question). I have the following code:

qBandHelper.cpp
@
qBandHelper::qBandHelper(QWidget *parent)
{
Ui_qBandHelper::setupUi(this);

connect(action_Members, SIGNAL( triggered() ), this, SLOT( showMemberDialog() ) );

}

void qBandHelper::showMemberDialog( void )
{
QDialog *dlg = new QDialog;
qBandMembers *memb = new qBandMembers(dlg);

memb->show();

}
@

qBandMembers.cpp
@
qBandMembers::qBandMembers(QDialog *dlg)
{
Ui_Members::setupUi(dlg);

connect(qBandMembers::buttonBox, SIGNAL(rejected()), this, SLOT(cancel()) );
connect(qBandMembers::buttonBox, SIGNAL(accepted()), this, SLOT(save()) );

}
@

(this is only the relevant parts, of course). The qBandMembers class inherits from the qBandHelper class, but thats not relevant to the problem I have:

If I klick the button for the member window, I get a copy of the original window (not exactly if the classes don't inherit, of course), but not the Ui I defined in any way.

Can somebody clearify my misunderstanding(s)?

BTW: I can post the Ui-Files (generates to the Designer), if needed.

Thanks a lot in advance!

Best regards Jan

[jankoh]

Hi there again,

I found out, if I use
@
void qBandHelper::showMemberDialog( void )
{
QDialog *dlg = new QDialog;
qBandMembers *memb = new qBandMembers(dlg);

dlg->show();

}
@
the correct window is created, but obviously when I want to destroy it by clicking OK/Cancel in the window (there is a buttonBox in there, which calls QWidget::close(), only the qBandMember objects are destroyed, but not the window itself.

There must be an easier (or more likely) correct way to generate/destroy a subwindow...

[jjoe]

Have a look for "Qt::WA_DeleteOnClose":http://doc.qt.digia.com/qt/qt.html#WidgetAttribute-enum

bq. Makes Qt delete this widget when the widget has accepted the close event (see QWidget::closeEvent()).

Add the follwing line before you call show

@dlg->setAttribute(Qt::WA_DeleteOnClose);@

[Amartel]

1. If you want to create a dialog you should inherit QDialog (Add new -> Qt -> Qt Designer Form Class -> QDialog)
2. Adding your widget via designer is: add standard parent (QWidget for example) -> right click -> promote to... (the rest is obvious)
3. You should create objects with parents ("Read manual for more info":http://qt-project.org/doc/qt-4.8/qobject.html#QObject)
4. If you do not want to use designer, you still should use layouts (something like this):
   @QDialog *dlg = new QDialog(this);
   QHBoxLayout *layout = new QHBoxLayout(dlg);
   qBandMembers *memb = new qBandMembers(dlg);
   layout->addWidget(memb)

dlg->show();@

P.S.: Qt::WA_DeleteOnClose is also a very good choice; it is used, if you want to delete your dialog without deleting it's parent.