QWidget window fails to open when "SetParent" is not null

[cazador7907]

My program displays a main window object when launched. On that window is a QPushButton control that should open a dialog window. When the below code executes though, nothing happens. After playing for a few minutes, I found that the problem occurs when "setParent" is executed. As long as that line is commented out, the code works fine. Once I uncomment it, the window fails to open.

Any idea of what I'm doing wrong?

@
cityDialogWindow = new cityDialog;
cityDialogWindow->setParent( this );
cityDialogWindow->show();
@

[mlong]

What type of widget does "this" refer to?

[cazador7907]

Oops. My apologies. The main window object also inherits from QWidget. I've put the class header below. It's nothing fancy.

@
#include <InterfaceWidgets/gameturnwidget.h>
#include <InterfaceWidgets/economywidget.h>
#include <InterfaceWidgets/citydialog.h>
#include <Helper/graphicshelper.h>
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <QString>
#include <QPushButton>

class mainWindow : public QWidget
{
Q_OBJECT

public:
mainWindow();

private:
gameTurnWidget *gameTurn;
economyWidget *economyInfo;
cityDialog *cityDialogWindow;

QPushButton *quitButton;
QPushButton *nextTurnButton;
QPushButton *showCityDialog;

QPushButton *createButton(QString caption);

QHBoxLayout *mainLayout;
graphicsHelper helper;

public slots:
void showCityWindow();

};

@

[goetz]

The usual way is to pass the parent widget in the constructor:

@
// change your constructor declaration to

public:
mainWindow(QWidget *parent = 0);

// change your constructor defintion to

mainWindow::mainWindow(QWidget *parent) : QWidget(parent)
{
//....
}

// and construct your object this way:

cityDialogWindow = new mainWindow(this);
@