in Qt Gui how to make a button randomly appear every click - c++

Question

Alright so is there any way to make this program randomly change the variables x and y every time the button is clicked i am new to programming...
#include <QtGui/QApplication>
#include "mainwindow.h"
#include <QtGUI>
#include <QWidget>
#include <cstdlib>
#include <ctime>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QWidget *window = new QWidget;
srand(time(0));
int x = 1+(rand()%900);
int y = 1+(rand()%400);
QPushButton *MainInter = new QPushButton("Push me!",window);
QPropertyAnimation *animation = new QPropertyAnimation(MainInter, "pos");
animation->setDuration(0);
animation->setEndValue(QPoint(x,y));
Object::connect(MainInter,SIGNAL(released()),animation,SLOT(start()));
window->resize(900,500);
window->show();
return a.exec();
}

Answer 1

What you can do is, instead of connecting the released() signal of your button directly to your animations start() SLOT, you would create your own custom SLOT. Then you connect the button to it, handle the action, and call the animation.
First read up on how to create a custom QWidget, instead of creating top level object in your main(). Simple example here
A custom widget might look like this:
widget.h
#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
class QPushButton;
class QPropertyAnimation;
class MyWidget : public QWidget
{
Q_OBJECT
public:
MyWidget(QWidget *parent = 0);
private:
QPushButton *button;
QPropertyAnimation *animation;
public slots:
void randomizeAnim();
};
#endif // WIDGET_H
widget.cpp
#include "widget.h"
#include <QPushButton>
#include <QPropertyAnimation>
#include <ctime>
MyWidget::MyWidget(QWidget *parent) :
QWidget(parent)
{
button = new QPushButton("Push me!", this);
animation = new QPropertyAnimation(button, "pos");
animation->setDuration(0);
QObject::connect(button, SIGNAL(released()), this, SLOT(randomizeAnim()));
}
void MyWidget::randomizeAnim()
{
srand(time(0));
int x = 1+(rand()%900);
int y = 1+(rand()%400);
animation->setEndValue(QPoint(x,y));
animation->start();
}
And now your main.cpp can be reduced to the boilerplate code:
#include <QApplication>
#include "widget.h"
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QWidget *window = new MyWidget;
window->resize(900,500);
window->show();
return a.exec();
}
Every time you click, your custom slot will handle the action and do the animation.