Window doesn't expand to show all elements of QHBoxLayout

[Jessehk]

I'm building a tic-tac-toe game.

In my main window, I've got a QHBoxLayout holding the board (UIBoard), and the settings (which now consist of a start and quit button). uiSettings uses a QGroupBox and a QVBoxLayout in order to hold the start and quit buttons.

Everything works, but when I start the program, I have to manually enlarge the window so that everything is shown -- not just the board.

Here's the code:

uiMain.hpp

#ifndef UIMAIN_HPP_
#define UIMAIN_HPP_
 
#include <QPushButton>
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <QApplication>
 
#include "uiBoard.hpp"
#include "uiSettings.hpp"
 
namespace ttt {
	class UIMain : public QWidget {
		Q_OBJECT
		private:
			UIBoard *uiboard_;
			UISettings *uisettings_;
			QHBoxLayout *mainLayout_;
		public:
			UIMain();
	};
}	
 
#endif /*UIMAIN_HPP_*/

#ifndef UIMAIN_HPP_
#define UIMAIN_HPP_

#include <QPushButton>
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <QApplication>

#include "uiBoard.hpp"
#include "uiSettings.hpp"

namespace ttt {
	class UIMain : public QWidget {
		Q_OBJECT
		private:
			UIBoard *uiboard_;
			UISettings *uisettings_;
			QHBoxLayout *mainLayout_;
		public:
			UIMain();
	};
}	

#endif /*UIMAIN_HPP_*/

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uiMain.cpp

#include "uiMain.hpp"
 
namespace ttt {
	UIMain::UIMain() :
		QWidget(),
		uiboard_( new UIBoard( 'X', true, this ) ),
		uisettings_( new UISettings( this ) ),
		mainLayout_( new QHBoxLayout( this ) ) {
 
		uiboard_->setFixedSize( 300, 300 );
 
		mainLayout_->addWidget( uiboard_ );
		mainLayout_->addWidget( uisettings_ );
	}
}

#include "uiMain.hpp"

namespace ttt {
	UIMain::UIMain() :
		QWidget(),
		uiboard_( new UIBoard( 'X', true, this ) ),
		uisettings_( new UISettings( this ) ),
		mainLayout_( new QHBoxLayout( this ) ) {
	
		uiboard_->setFixedSize( 300, 300 );
		
		mainLayout_->addWidget( uiboard_ );
		mainLayout_->addWidget( uisettings_ );
	}
}

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And finally, main.cpp

#include <iostream>
 
#include <QApplication>
 
#include "uiMain.hpp"
 
int main( int argc, char *argv[] ) {
	QApplication app( argc, argv );
 
	ttt::UIMain game;
	game.show();
 
	return app.exec();
}

#include <iostream>

#include <QApplication>

#include "uiMain.hpp"

int main( int argc, char *argv[] ) {
	QApplication app( argc, argv );
	
	ttt::UIMain game;
	game.show();
	
	return app.exec();
}

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I've attached images showing what I see when I start the program, and what I see after I manually enlarge the window.

Any help would be greatly appreciated and I'd be happy to provide more information if it would help.