Activating particular LineEdit while taking input from on screen numpad - c++

Question

I am making a login form in qt where input is taken from the numpad. The numpad is created on screen. When I am trying to take input from the numpad,
It takes the input in the both of the lineEdit field. So how can I separate both of these while taking the input from the numpad?
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "mainscreen.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
connect(ui->dB1,SIGNAL(released()),this,SLOT(display()));
connect(ui->dB2,SIGNAL(released()),this,SLOT(display()));
connect(ui->dB3,SIGNAL(released()),this,SLOT(display()));
connect(ui->dB4,SIGNAL(released()),this,SLOT(display()));
connect(ui->dB5,SIGNAL(released()),this,SLOT(display()));
connect(ui->dB6,SIGNAL(released()),this,SLOT(display()));
connect(ui->dB7,SIGNAL(released()),this,SLOT(display()));
connect(ui->dB8,SIGNAL(released()),this,SLOT(display()));
connect(ui->dB9,SIGNAL(released()),this,SLOT(display()));
connect(ui->dB0,SIGNAL(released()),this,SLOT(display()));
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::display()
{
QPushButton *qp=(QPushButton*)sender();
ui->lineEdit->setText(ui->lineEdit->text()+qp->text());
ui->lineEdit_2->setText(ui->lineEdit_2->text()+qp->text());
}
void MainWindow::on_pushButton_clicked()
{
QString username=ui->lineEdit->text();
QString password=ui->lineEdit_2->text();
if(username=="text"&&password=="text")
{
hide();
main_scn=new MainScreen();
main_scn->setWindowFlags(Qt::Window|Qt::FramelessWindowHint);
main_scn->show();
}
}
the UI is here, please check this out

Answer 1

Creating a numpad in that way is inconvenient since it will place the text in both QLineEdit, and usually the username and password are not always the same.
My proposal is to create a Numpad that does not need to be connected by signals, but an event will be sent so that the widget that has the focus.
numpadwidget.h
#ifndef NUMPADWIDGET_H
#define NUMPADWIDGET_H
#include <QApplication>
#include <QGridLayout>
#include <QKeyEvent>
#include <QToolButton>
#include <QWidget>
class NumpadWidget : public QWidget
{
Q_OBJECT
public:
explicit NumpadWidget(QWidget *parent = nullptr) : QWidget(parent)
{
QGridLayout *lay = new QGridLayout(this);
const std::vector<QPair<QString, int>> values{{"1", Qt::Key_1}, {"2", Qt::Key_2}, {"3", Qt::Key_3},
{"4", Qt::Key_4}, {"5", Qt::Key_5}, {"6", Qt::Key_6},
{"7", Qt::Key_7}, {"8", Qt::Key_8}, {"9", Qt::Key_9},
{".", Qt::Key_Colon}, {"0", Qt::Key_0}, {"*", Qt::Key_Asterisk}};
int i = 0;
int j = 0;
for(const QPair<QString, int> & value : values){
QToolButton *button =new QToolButton;
button->setText(value.first);
button->setFixedSize(40,40);
lay->addWidget(button, i, j);
button->setProperty("text", value.first);
button->setProperty("key", value.second);
connect(button, &QToolButton::clicked, this, &NumpadWidget::onClicked);
j++;
if(j % 3 == 0){
j=0;
i++;
}
}
setFixedSize(sizeHint());
}
private slots:
void onClicked()
{
if(QWidget *widget = QApplication::focusWidget()){
QString text = sender()->property("text").toString();
int key = sender()->property("key").toInt();
QKeyEvent * event = new QKeyEvent(QEvent::KeyPress, key, Qt::NoModifier, text);
QCoreApplication::postEvent(widget, event);
}
}
};
#endif // NUMPADWIDGET_H
Then the NumpadWidget is promoted so that it can be used in Qt Designer, in the following link it indicates how to do it
The complete project can be found in the following link.