Link lineEdit to a progressbar

nanor

Hi everyone
I have three lineEdits(lineEdit_1, lineEdit_2 and lineEdit_3 ) in Dialog window. When lineEdit_2 and lineEdit_3 are empty, as the user types something in the lineEdit_1, an arc is supposed to be drawn from 0 to 120 degree.
I have written the following code. My problem is that when I type something in the lineEdit_1, the arc is drawn even if the lineEdit_2 and lineEdit_3 are not empty.
I don't know how to define the situation that just when the lineEdit_2 and lineEdit_3 are empty and the user types something in lineEdit_1, the arc is drawn.
I would appreciate if someone could help me

Here is the code:

dialog.h:

#ifndef DIALOG_H
#define DIALOG_H

#include <QDialog>
#include <QPainter>
#include <QPen>
#include <QRectF>
#include <QSlider>
#include <QLineEdit>

namespace Ui {
class Dialog;
}

class Dialog : public QDialog
{
  Q_OBJECT

public:
  explicit Dialog(QWidget *parent = 0);
  ~Dialog();
  double progress;
  QLineEdit *lineEdit_1;
  QLineEdit *lineEdit_2 ;
  QLineEdit *lineEdit_3;


public slots:
  void setProgress();


protected:
  void paintEvent(QPaintEvent *);

private:
  Ui::Dialog *ui;

};

#endif // DIALOG_H

dialog.cpp:

#include "dialog.h"
#include "ui_dialog.h"

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

    lineEdit_1 = new QLineEdit(this);
    lineEdit_1->setGeometry(500,50,100,50);
    lineEdit_1->show();


    lineEdit_2 = new QLineEdit(this);
    lineEdit_2->setGeometry(500,150,100,50);
    lineEdit_2->show();


    lineEdit_3 = new QLineEdit(this);
    lineEdit_3->setGeometry(500,250,100,50);
    lineEdit_3->show();


    if(lineEdit_2->text().isEmpty() && lineEdit_3->text().isEmpty())
    {
     connect(lineEdit_1, SIGNAL(textChanged(const QString &)), this, SLOT(setProgress()));
    }


}

Dialog::~Dialog()
{
    delete ui;
}

void Dialog::setProgress()
{
    progress = 120;
    this->update();
}




void Dialog::paintEvent(QPaintEvent *)
{
    QPainter p(this);

    QPen pen;
    pen.setWidth(7);
    pen.setColor(Qt::red);
    p.setPen(pen);

    p.setRenderHint(QPainter::Antialiasing);

    QRectF rectangle(30.0, 20.0, 200.0, 200.0);


    int startAngle = 0 * 16;
    int spanAngle = progress * 16;



    p.drawArc(rectangle, startAngle, spanAngle);


    //the number texted in the circle center
    p.drawText(rectangle,Qt::AlignCenter,QString::number(progress)+" %");
}

main.cpp:

#include "dialog.h"
#include <QApplication>
#include <QSlider>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    Dialog w;
    w.show();


    return a.exec();
}

The output:
The Output.png

SGaist

Hi,

Check the status of all your line edits in the slot and set the value accordingly.

nanor

@SGaist Hi. Thank you so much.