How to change button position in a run time?

[Unique]

Hello,

I'm new to QT and I want to know, how to change button position in a run time? Plus, how can I change position inside a method of MainWindow while a button was created in a constructor?

[dheerendra]

use button.setGeometry(x,y,width,height) method to position.

[mrjj]

Hi and welcome to the forums.

To do as you ask, would be something like

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

namespace Ui {
class MainWindow;
}

#include <QPushButton>// so it knows type

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
public slots: // notice this. it makes it a slot
    void buttonClicked(); // to be called when clicked
private:
    Ui::MainWindow *ui;    
    QPushButton *button=NULL; // the button must be a member to be used from other functions in mainwin
};

#endif // MAINWINDOW_H

and in .cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget* parent) :
  QMainWindow(parent),
  ui(new Ui::MainWindow) {
  ui->setupUi(this);

  // create button
  button = new QPushButton("Click me", this);
  // hook up its clicked signal to a function in main
  connect(button, &QPushButton::clicked, this, &MainWindow::buttonClicked);
  // move and resize it
  button->setGeometry(100, 100, 50, 50);
  // and show it
  button->show();
}

void MainWindow::buttonClicked() {
  // move to random position.
  button->move( rand() % 200, rand() % 200);
}

runnable project to play with
https://www.dropbox.com/s/3l21boazu2uhpfl/MyFirstButtons.zip?dl=0

Result: