Qt for beginners Exercise 1 answer: Difference between revisions

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#REDIRECT [[Qt for Beginners]]
 
[toc align_right="yes" depth="3"]
[[Category:Qt_for_beginners]]
[[Category:Tutorial]]
[[Category:HowTo]]
 
= Qt for beginners — Exercise 1 : basis (Answer) =
 
[[Qt_for_beginners_Exercise_1_basis|<<< Exercise 1 : basis]] | [[Qt_for_beginners|Summary]] | Exercise 2 >>>
 
== Widgets ==
 
Since this application seems to be quite complicated, we have chosen to split into several files :
 
''main.cpp''
<code>
#include <QApplication>
#include "window.h"
 
int main(int argc, char **argv)
{
QApplication app (argc, argv);
 
Window window;
window.show();
 
return app.exec();
}
</code>
 
''window.h''
<code>
#ifndef WINDOW_H
#define WINDOW_H
 
#include <QWidget>
 
class QPushButton;
class QRadioButton;
class Window : public QWidget
{
public:
explicit Window(QWidget *parent = 0);
private:
QRadioButton *m_chickenButton;
QRadioButton *m_sandwichButton;
QRadioButton *m_soupButton;
 
QPushButton *m_selectButton;
};
 
#endif // WINDOW_H
</code>
 
''window.cpp''
<code>
#include "window.h"
 
#include <QRadioButton>
#include <QPushButton>
#include <QButtonGroup>
 
Window::Window(QWidget *parent) :
QWidget(parent)
{
// Set size of the window
setFixedSize(200, 150);
 
// Create and position the button
m_chickenButton = new QRadioButton("Roasted chicken", this);
m_chickenButton->setGeometry(10, 10, 180, 30);
 
m_sandwichButton = new QRadioButton("Sandwich", this);
m_sandwichButton->setGeometry(10, 40, 180, 30);
 
m_soupButton = new QRadioButton("Soup", this);
m_soupButton->setGeometry(10, 70, 180, 30);
 
m_selectButton = new QPushButton("Select this menu", this);
m_selectButton->setGeometry(10, 110, 180, 30);
 
QButtonGroup '''group = new QButtonGroup(this);
group->addButton(m_chickenButton);
group->addButton(m_sandwichButton);
group->addButton(m_soupButton);
}
</code>
 
You can also remove the buttons from the attributes list and put the inside the constructor.
 
 
h2. Signals and slots
 
<code>
#include <QApplication>
#include <QPushButton>
 
int main(int argc, char'''*argv)
{
QApplication app (argc, argv);
 
QWidget window;
window.setFixedSize(100, 80);
 
QPushButton *buttonInfo = new QPushButton("Info", &amp;window);
buttonInfo->setGeometry(10, 10, 80, 30);
 
QPushButton *buttonQuit = new QPushButton("Quit", &amp;window);
buttonQuit->setGeometry(10, 40, 80, 30);
 
window.show();
 
// Connections
// Connecting the button associated to info to the "aboutQt" slot of QApplication
QObject::connect(buttonInfo, SIGNAL (clicked()), &amp;app, SLOT (aboutQt()));
 
// Connecting the button associated to close to the "quit" slot of QApplication
QObject::connect(buttonQuit, SIGNAL (clicked()), &amp;app, SLOT (quit()));
 
return app.exec();
}
</code>

Latest revision as of 14:35, 5 May 2015

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