Connection between Qpushbutton with line Edit widgets

[cholokid]

My problem is that, i want to create a simple calculator as a desktop application,
so , i have already create a Qpushbuttons with label 1,2,3,4,5 and so on . So if user click the button as signal, so the line Edit widget receive the corresponding number that is clicked(display that number).
please help me!!!

[SGaist]

Hi and welcome to devnet,

There's an "example":http://qt-project.org/doc/qt-4.8/widgets-calculator.html in Qt's documentation doing exactly that

[BlackStar]

be the class CalculatorUi
@class CalculatorUi : public Widget
{
Q_OBJECT
QPushButton* oneButton;
QLineEdit* displayScreen;
public :
CalculatorUi(QWidget* parent) : QWidget(parent),oneButton(new QPushButton("1")),displayScreen(new QLineEdit())
{
QVBoxLayout* layout (new QVBoxLayout);
layout->addWidget(displayScreen);
layout->addWidget(oneButton);

     connect(oneButton,SIGNAL(clicked()),this,SLOT(concatOne()));
 }

private slots :
  void concatOne()
   {
      displayScreen->setText(displayScreen->text() + "1");
    }

};@

This is just an example of how you can do it, hope it helped you,
we have a button wich is done for 1, and the display screen wich is of class QLineEdit, i created a private slot called concatOne and i connected it to the signal clicked of the button, so when you click on this button it append "1" to the value that you have into the screen !

[cholokid]

the first file, mainwindow.h

@#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

namespace Ui {
class MainWindow;
}@

@class MainWindow : public QMainWindow
{
Q_OBJECT

public:@
@ explicit MainWindow(QWidget *parent = 0);
~MainWindow();

private:
Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H@

second file, main.cpp
@
#include "mainwindow.h"
#include <QApplication>

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();@
@
return a.exec();
}@

third file, mainwindow.cpp

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

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

@
}

MainWindow::~MainWindow()
{
delete ui;@
@}
@

fourth file, mainwindiw.ui
this file , i have inserted the qpushbutton and line Edit widget, by draging.(graphically), so need to connenct the qpushbutton with line Edit, means that, if i clicked the button , line Edit show, the number to corresponding button, , i want to create a simple calculator. i am a beginer in qt programming.

[JvdGlind]

Assuming your QLineEdit is called 'lineEdit' and your QPushButton is called 'pushButton', adding the following to MainWindow will get you started:

@void MainWindow::on_pushButton_clicked()
{
ui->lineEdit->clear();
ui->lineEdit->insert(QString('1'));
}
@