Button in Layout help

[IsleWitch]

Hi,

I'am having a problem in my code. I used addSpacing() and SeFixedSized(), to fix the buttons in my code. But the problem is once i enlarge the window, the buttons stay the same size and they dont get bigger with the same ratio as the window. I would appreciate any assistance on how i can fix this problem.

This is my code:

#include <QLabel>
#include <QPushButton>
#include <QProgressBar>
#include <QLineEdit>
#include <QIcon>
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <QToolButton>
#include <QApplication>
#include "auto.h"
 
Auto::Auto(QWidget *parent) : QWidget(parent)
{
	//  Title of the window
	this->setWindowTitle("Main Menu");	
	this->resize(500, 350); // I'm using your old values
 
	b_start = new QPushButton(tr("START/STOP"));
	b_exit = new QPushButton(tr("Exit"));
 
 
    b_start->setFixedSize(70,30);
    b_exit->setFixedSize(50,30);
 
	l_welcome = new QLabel(tr("--Automatic Interface--"));
 	l_welcome->setFont(QFont("Times", 18, QFont::Bold));
 
 
	l_welcome->setAlignment(Qt::AlignCenter);
 
	l_load = new QLabel(tr("Load Images"));
 	l_load->setFont(QFont("Times", 12, QFont::Bold));
 
	l_load->setAlignment(Qt::AlignLeft);
 
	t_text = new QLineEdit(this);
	t_text->setFixedSize(150,20);
	t_browse = new QToolButton(this); 
	p_prog = new QProgressBar(this);
	p_prog->setFixedSize(100,20);
	QHBoxLayout *v_1 = new QHBoxLayout;
	v_1->setAlignment(Qt::AlignLeft);
 
	v_1->addWidget(l_load);
	v_1->addSpacing(10);
	v_1->addWidget(t_text);
	v_1->addWidget(t_browse);
	v_1->addSpacing(20);
	v_1->addWidget(p_prog);
 
	QVBoxLayout *v_2 = new QVBoxLayout;
	v_2->setAlignment(Qt::AlignCenter);
 
	v_2->addWidget(b_start);
	v_2->addWidget(b_exit);
 
	QVBoxLayout *layout_vert = new QVBoxLayout;
	layout_vert->setAlignment(Qt::AlignCenter);
 
	layout_vert->addWidget(l_welcome);
	layout_vert->addSpacing(30);
	layout_vert->addLayout(v_1);
	layout_vert->addSpacing(30);
	layout_vert->addLayout(v_2);
 
 
	this->setLayout(layout_vert);
 
}

#include <QLabel>
#include <QPushButton>
#include <QProgressBar>
#include <QLineEdit>
#include <QIcon>
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <QToolButton>
#include <QApplication>
#include "auto.h"

Auto::Auto(QWidget *parent) : QWidget(parent)
{
	//  Title of the window
	this->setWindowTitle("Main Menu");	
	this->resize(500, 350); // I'm using your old values

	b_start = new QPushButton(tr("START/STOP"));
	b_exit = new QPushButton(tr("Exit"));
	

    b_start->setFixedSize(70,30);
    b_exit->setFixedSize(50,30);
    
	l_welcome = new QLabel(tr("--Automatic Interface--"));
 	l_welcome->setFont(QFont("Times", 18, QFont::Bold));
 	
	
	l_welcome->setAlignment(Qt::AlignCenter);
	
	l_load = new QLabel(tr("Load Images"));
 	l_load->setFont(QFont("Times", 12, QFont::Bold));
 	
	l_load->setAlignment(Qt::AlignLeft);

	t_text = new QLineEdit(this);
	t_text->setFixedSize(150,20);
	t_browse = new QToolButton(this); 
	p_prog = new QProgressBar(this);
	p_prog->setFixedSize(100,20);
	QHBoxLayout *v_1 = new QHBoxLayout;
	v_1->setAlignment(Qt::AlignLeft);

	v_1->addWidget(l_load);
	v_1->addSpacing(10);
	v_1->addWidget(t_text);
	v_1->addWidget(t_browse);
	v_1->addSpacing(20);
	v_1->addWidget(p_prog);

	QVBoxLayout *v_2 = new QVBoxLayout;
	v_2->setAlignment(Qt::AlignCenter);

	v_2->addWidget(b_start);
	v_2->addWidget(b_exit);

	QVBoxLayout *layout_vert = new QVBoxLayout;
	layout_vert->setAlignment(Qt::AlignCenter);
	
	layout_vert->addWidget(l_welcome);
	layout_vert->addSpacing(30);
	layout_vert->addLayout(v_1);
	layout_vert->addSpacing(30);
	layout_vert->addLayout(v_2);

	
	this->setLayout(layout_vert);

}

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Thanks!!