why isnt my button showing?

[IsleWitch]

Hi,

Im trying to create a A GUI.
In my main, im trying to create the "QUIT" button, but it wont show when i run it. I would appreaciate if anyone would tell me why it wont show.


Here is my code:


#include <QApplication>
#include <QPushButton>
#include <QWidget>

#include "browseimages.h"


class MyWidget : public QWidget
{
public:
MyWidget(QWidget *parent = 0);
};

MyWidget::MyWidget(QWidget *parent)
: QWidget(parent)
{
QPushButton *b_quit = new QPushButton(tr("Quit"), this);

connect(b_quit, SIGNAL(clicked()), qApp, SLOT(b_quit()));

}


int main(int argc, char **argv)
{
QApplication app(argc, argv);
BrowseImages window;

window.show();
return app.exec();
}

Thank you.

[marcel]

Where are you creating/showing an instance of MyWidget?

Also b_quit will not look good. You could add it to a layout to handle its position and size.

[IsleWitch]

Thanks Marcel,

I forgot to creat an instance of MyWidget. I fixed that, and i also used layout to handle the position and size of my quit button.

But, my "quit" button (b_quit) isnt working. The window wont close when i press "Quit". I would like to know where is the problem.

Here is the fixed code:


#include <QApplication>
#include "browseimages.h"


#include <QPushButton>
#include <QWidget>
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <Qlabel>


class MyWidget : public QWidget
{
public:
MyWidget(QWidget *parent = 0);
};

MyWidget::MyWidget(QWidget *parent)
: QWidget(parent)
{

QPushButton *b_quit = new QPushButton(tr("Quit"));
QPushButton *b_search = new QPushButton(tr("Search"));

connect(b_quit, SIGNAL(clicked()), qApp, SLOT(b_quit()));

b_search->setFixedHeight(40);
b_quit->setFixedHeight(40);

QVBoxLayout *v_search = new QVBoxLayout;
v_search->setAlignment(Qt::AlignCenter);
QLabel *l_search_img = new QLabel();
l_search_img->setPixmap(QPixmap("images/manual.png"));
v_search->addWidget(l_search_img);
v_search->addWidget(b_search);

QHBoxLayout *h_quit = new QHBoxLayout;
h_quit->addStretch();
h_quit->addWidget(b_quit);
h_quit->addStretch();

QVBoxLayout *layout_vert = new QVBoxLayout;


QHBoxLayout *layout_mid = new QHBoxLayout;
layout_mid->addLayout(v_search);

layout_vert->addLayout(layout_mid);

layout_vert->addSpacing(30);

QHBoxLayout *h_search = new QHBoxLayout;
layout_vert->addLayout(h_search);
layout_vert->addLayout(h_quit);

layout_vert->addSpacing(30);
this->setLayout(layout_vert);
}


int main(int argc, char **argv)
{
QApplication app(argc, argv);
MyWidget widget;

widget.show();
return app.exec();
}

Thanks in advance,

[marcel]

Your connect is wrong. Should be:


connect(b_quit, SIGNAL(clicked()), qApp, SLOT(quit()));

[IsleWitch]

Your connect is wrong. Should be:


connect(b_quit, SIGNAL(clicked()), qApp, SLOT(quit()));


Thank you what a silly mistake :o