GUI not displaying

I have been trying to get a GUI to display inside Qt 3.3.7 and I have designed it off other classes I have successfully created. But for some reason all I see in this QDialog is the very first item I add to the layout. Here is my code for the constructor and the createGui function. Sorry if there is a typo as my coding machine is not hooked up online so I have to retype all my code to show on here. Thanks for your help!

Code:

---

ScreeningDialog::ScreeningDialog( Configuration *conf, QWidget *parent ) : QDialog( parent )
{
   createGui( );
   mpConfiguration = config;
   mScreeningLocation = mpConfiguration->getScreeningExe( );
 
   setPalette( parent->palette( ) );
}

---

Code:

---

void ScreeningDialog::createGui( )
{
   QWidget *mainWidget = new QWidget( this );
   QGridLayout = new QGridLayout( mainWidget );
 
   QLabel *outputDirLabel = new QLabel( tr( "Output Directory:" ), mainWidget );
   mpOutputDirLnEd = new QLineEdit( mainWidget );
   QPushButton *outputButton = new QPushButton( tr( "Open" ), mainWidget );
   connect( outputButton, SIGNAL( clicked( ) ), this, SLOT( openDirPressed( ) ) );
 
   QLabel *confFileLabel = new QLabel( tr( "Configuration File:" ), mainWidget );
   mpConfFileLnEd = new QLineEdit( mainWidget );
   QPushButton *confButton = new QPushButton( tr( "Open" ), mainWidget );
   connect( confButton, SIGNAL( clicked( ) ), this, SLOT( openFilePressed( ) ) );
 
   QGroupBox *methodBox = new QGroupBox( tr( "Method" ), mainWidget );
   QVBoxLayout *methodLayout = new QVBoxLayout( methodBox );
   QButtonGroup *methodGroup = new QButtonGroup( );
   methodGroup->setExclusive( true );
   mpWidthCB = new QCheckBox( tr( "Width" ), methodBox );
   mpAutoCB = new QCheckBox( tr( "Auto" ), methodBox );
 
   methodGroup->insert( mpWidthCB );
   methodGroup->insert( mpAutoCB );
 
   methodLayout->addWidget( mpWidthCB );
   methodLayout->addWidget( mpAutoCB );
 
   QPushButton *executeButton = new QPushButton( tr( "Execute" ), mainWidget );
   connect( executeButton, SIGNAL( clicked( ) ), this, SLOT( executePressed( ) ) );
   QPushButton *cancelButton = new QPushButton( tr( "Cancel" ), mainWidget );
   connect( cancelButton, SIGNAL( clicked( ) ), this, SLOT( cancelPressed( ) ) );
 
   mainLayout->addWidget( outputDirLabel, 0, 0 );
   mainLayout->addWidget( mpOutputDirLnEd, 0, 1 );
   mainLayout->addWidget( outputButton, 0, 2 );
   mainLayout->addWidget( confFileLabel, 1, 0 );
   mainLayout->addWidget( mpConfFileLnEd, 1, 1 );
   mainLayout->addWidget( confButton, 1, 2 );
   mainLayout->addWidget( methodBox, 2, 0 );
   mainLayout->addWidget( executeButton, 3, 1 );
   mainLayout->addWidget( cancelButton, 3, 2 );
}

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I cannot figure why the only thing I see when I open the dialog is the label that says "Output Directory:". Thanks for all your help with getting my dialog to display correctly!

Hi ToddAtWSU:

Why are you using 'mainWidget'?

As far as I can see, you are using a QWidget inside a QWidget. Your class ScreeningDialog is a QWidget, so yo can then omit:

Code:

---

QWidget *mainWidget = new QWidget( this );

---

and use 'this' insted of 'mainWidget'. For example:

Code:

---

.....
   QGridLayout = new QGridLayout( this );
   QLabel *outputDirLabel = new QLabel( tr( "Output Directory:" ), this );
   mpOutputDirLnEd = new QLineEdit( this );
   ....

---

I think that may be your problem...

Thanks! That worked. I don't know why my way didn't work because on other dialogs I had created a mainWidget like I did here and it always worked fine. That is why I was so frustrated with this one, it was identical to how I set up other QDialogs but oh well...it worked with using "this" all the time. Thanks for your help!