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How to add a Status Bar in QT (without using forms) and display the length of the text and his coordinates (which are being refreshed)?

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I would like to add the status bar to my program, but I can't find any examples of it online.

I saw few people using some forms which I don't use. I would like my status bar to be able to show text length and his coordinates. And also I would like to refresh it after every change (changing the text and it's position).

My code currently can change the display text, change it's position using mouse or keyboard and save that data into a file or open that file and load data.

My code:

#include <QApplication>
#include <QLabel>
#include <QMainWindow>
#include <QMouseEvent>
#include <QMessageBox>
#include <QVBoxLayout>
#include <QFormLayout>
#include <QDialogButtonBox>
#include <QLineEdit>
#include <QAction>
#include <QMenu>
#include <QMenuBar>
#include <QPainter>
#include <QFileDialog>
#include <QTextStream>
#include <QStatusBar>
#include <QProgressBar>
#include <QTextEdit>

class MyDialog : public QDialog {
public:
    MyDialog();
    QVBoxLayout* mainLayout;
    QWidget* editWidget;
    QFormLayout* editLayout;
    QLineEdit* lineEdit;
    QDialogButtonBox* buttonBox;

};

MyDialog::MyDialog() {
    lineEdit = new QLineEdit;
    editLayout = new QFormLayout;
    editLayout->addRow(new QLabel(tr("Novi tekst:")), lineEdit);
    editWidget = new QWidget;
    editWidget->setLayout(editLayout);
    buttonBox = new QDialogButtonBox(QDialogButtonBox::Ok |QDialogButtonBox::Cancel);
    connect(buttonBox, SIGNAL(accepted()), this, SLOT(accept()));
    connect(buttonBox, SIGNAL(rejected()), this, SLOT(reject()));
    mainLayout = new QVBoxLayout;
    mainLayout->addWidget(editWidget);
    mainLayout->addWidget(buttonBox);
    setLayout(mainLayout);
    setWindowTitle("Promjena teksta");

}


class MyMainWindow : public QMainWindow {
public:
    MyMainWindow();
    QLabel* MyLabel;
    QMenu* EditMenu;
    QAction* EditNoviTekst;
    QString* String;
    QString*poz;
    int a,b;


    void mousePressEvent(QMouseEvent *event) override;
    void keyPressEvent(QKeyEvent *event) override;
    void paintEvent(QPaintEvent *event) override;

    void EditNoviTekstMenu();


    void FileSaveAsMenu();
    void FileOpenMenu();
    QMenu* FileMenu;
    QAction* FileSaveAs;
    QAction* FileOpen;
    QStatusBar* StatusBar;

};

void MyMainWindow::mousePressEvent(QMouseEvent* event) {
    if (event->button() == Qt::LeftButton) {
        MyLabel->move(event->x(), event->y());
        a=MyLabel->x();
        b=MyLabel->y();
    }
}

void MyMainWindow::keyPressEvent(QKeyEvent *event) {
    switch( event->key() ){
        case Qt::Key_Left: MyLabel->move(MyLabel->pos().x()-1,MyLabel->pos().y());
        a=MyLabel->x();
        b=MyLabel->y();
            break;
        case Qt::Key_Right: MyLabel->move(MyLabel->pos().x()+1,MyLabel->pos().y());
        a=MyLabel->x();
        b=MyLabel->y();
            break;
        case Qt::Key_Up: MyLabel->move(MyLabel->pos().x(),MyLabel->pos().y()-1);
        a=MyLabel->x();
        b=MyLabel->y();
            break;
        case Qt::Key_Down: MyLabel->move(MyLabel->pos().x(),MyLabel->pos().y()+1);
        a=MyLabel->x();
        b=MyLabel->y();
        break;
}
}


MyMainWindow::MyMainWindow() {
    MyLabel = new QLabel(this);
    MyLabel->setText("Hello World!");
    MyLabel->move(10, 20);
    QString xxx;
    a=MyLabel->x();
    b=MyLabel->y();
     //(*String)=MyLabel->text();

     xxx=MyLabel->text();
    //int duzina=xxx.length();
    String=&xxx;
    int duzina=(*String).length();

    FileSaveAs = new QAction(tr("&Save As..."), this);
    FileSaveAs->setShortcut(tr("CTRL+S"));
    connect(FileSaveAs, &QAction::triggered, this,&MyMainWindow::FileSaveAsMenu);

    FileOpen = new QAction(tr("&Open..."), this);
    FileOpen->setShortcut(tr("CTRL+O"));
    connect(FileOpen, &QAction::triggered, this,&MyMainWindow::FileOpenMenu);

    FileMenu = menuBar()->addMenu(tr("&File"));
    FileMenu->addAction(FileSaveAs);
    FileMenu->addAction(FileOpen);

    EditNoviTekst = new QAction(tr("&Novi tekst..."), this);
    EditNoviTekst->setShortcut(tr("CTRL+N"));
    connect(EditNoviTekst, &QAction::triggered, this,&MyMainWindow::EditNoviTekstMenu);

    EditMenu = menuBar()->addMenu(tr("&Edit"));
    EditMenu->addAction(EditNoviTekst);



    QStatusBar *statusBar = this->statusBar();


    QLabel *coord = new QLabel( tr("  Pozicija  ") );
    QLabel *length = new QLabel( tr(" Duzina  ") );




    coord->setMinimumSize( coord->sizeHint() );
    coord->setAlignment( Qt::AlignCenter );
    //coord->setText(QString::number(MyLabel->x())+","+QString::number(MyLabel->y()));
    coord->setText(QString::number(a)+","+QString::number(b));
    coord->setToolTip( tr("Koordinate teksta."));

    statusBar->addPermanentWidget( coord );

    length->setMinimumSize( length->sizeHint() );
    length->setAlignment( Qt::AlignCenter );


    length->setText(QString::number(duzina));

    length->setToolTip( tr("Govori nam duzinu teksta..."));

    statusBar->addWidget( length );
    statusBar->showMessage( tr("Ready"), 500 );

}
void MyMainWindow::FileSaveAsMenu(){
    QString fileName = QFileDialog::getSaveFileName(this,"Save As...", "", "FESB File (*.fsb)");

        if (!fileName.isEmpty()) {
            QFile file(fileName);
            if (!file.open(QIODevice::WriteOnly)) {
                QMessageBox::information(this,"Unable to Open File", file.errorString());
                return;
            }
            QTextStream out(&file);
            out << "fesb file" << endl;
            out << MyLabel->text() << endl;
            out << MyLabel->pos().x() << endl;
            out << MyLabel->pos().y() << endl;
            out << pos().x() << endl;
            out << pos().y() << endl;
            out << size().width() << endl;
            out << size().height() << endl;
        }
}
void MyMainWindow::FileOpenMenu(){
    QString fileName = QFileDialog::getOpenFileName(this,"Open Geometry...", "", "FESB File (*.fsb)");
    if (!fileName.isEmpty()) {
        QFile file(fileName);
        if (!file.open(QIODevice::ReadOnly)) {
            QMessageBox::information(this, "Unable to Open File", file.errorString());
            return;
        }
    QTextStream in(&file);
    QString str; str = in.readLine();
        if(str=="fesb file") {
            str = in.readLine();
            MyLabel->setText(str);
            int x, y, w, h;
            in >> x >> y;
            MyLabel->move(x, y);
            in >> x >> y >> w >> h;
            this->setGeometry(x, y, w, h);
        }
    }
}


void MyMainWindow::EditNoviTekstMenu() {
MyDialog dialog;
int ret = dialog.exec();
if( ret == QDialog::Accepted ) {
MyLabel->setText(dialog.lineEdit->text());
//String->append(dialog.lineEdit->text());
(*String)=dialog.lineEdit->text();
}
}

void MyMainWindow::paintEvent(QPaintEvent*){
QSize size = this->size();
QPainter painter(this);
painter.drawLine(0, size.height(), size.width(), 20);
}






int main(int argc, char **argv) {
    QApplication app (argc, argv);
    MyMainWindow mainWindow;
    mainWindow.resize(300,150);
    mainWindow.show();



    return app.exec();
}
c++ qt qstatusbar
Original Q&A
2

There are 2 best solutions below

7
SailorV On BEST ANSWER

From a qmainwindow: Here is a minimal sample for your MyMainWindow class:

void MyMainWindow::updateStatusBar(){
    QString statusBar_info = QString("Len:%1, x:%2, y:%2")
    .arg(MyLabel->fontMetrics().boundingRect(MyLabel->text()).width()) //text_len
    .arg(MyLabel->x())                                               //text_x
    .arg(MyLabel->y());                                              //text_y
    statusBar()->showMessage(statusBar_info);
}
1
Matt Baran On

I have the answer from another question you posted about this which is now deleted:

To solve the issue you have to make coord and length variables global so that they can be accessed and modified inside your other functions , here's the updated code :

#include <QApplication>
#include <QLabel>
#include <QMainWindow>
#include <QMouseEvent>
#include <QMessageBox>
#include <QVBoxLayout>
#include <QFormLayout>
#include <QDialogButtonBox>
#include <QLineEdit>
#include <QAction>
#include <QMenu>
#include <QMenuBar>
#include <QPainter>
#include <QFileDialog>
#include <QTextStream>
#include <QStatusBar>
#include <QProgressBar>
#include <QTextEdit>

class MyDialog : public QDialog {
public:
    MyDialog();
    QVBoxLayout* mainLayout;
    QWidget* editWidget;
    QFormLayout* editLayout;
    QLineEdit* lineEdit;
    QDialogButtonBox* buttonBox;

};

MyDialog::MyDialog() {
    lineEdit = new QLineEdit;
    editLayout = new QFormLayout;
    editLayout->addRow(new QLabel(tr("Novi tekst:")), lineEdit);
    editWidget = new QWidget;
    editWidget->setLayout(editLayout);
    buttonBox = new QDialogButtonBox(QDialogButtonBox::Ok |QDialogButtonBox::Cancel);
    connect(buttonBox, SIGNAL(accepted()), this, SLOT(accept()));
    connect(buttonBox, SIGNAL(rejected()), this, SLOT(reject()));
    mainLayout = new QVBoxLayout;
    mainLayout->addWidget(editWidget);
    mainLayout->addWidget(buttonBox);
    setLayout(mainLayout);
    setWindowTitle("Promjena teksta");

}

class MyMainWindow : public QMainWindow {
public:
    MyMainWindow();
    QLabel* MyLabel;
    QMenu* EditMenu;
    QAction* EditNoviTekst;
    QLabel *coord;
    QLabel *length;
    QString* String;
    QString*poz;
    int a,b;


    void mousePressEvent(QMouseEvent *event) override;
    void keyPressEvent(QKeyEvent *event) override;
    void paintEvent(QPaintEvent *event) override;

    void EditNoviTekstMenu();


    void FileSaveAsMenu();
    void FileOpenMenu();
    QMenu* FileMenu;
    QAction* FileSaveAs;
    QAction* FileOpen;
    QStatusBar* StatusBar;

};

void MyMainWindow::mousePressEvent(QMouseEvent* event) {
    if (event->button() == Qt::LeftButton) {
        MyLabel->move(event->x(), event->y());
         a=MyLabel->pos().x();
         b=MyLabel->pos().y();
         coord->setText(QString::number(a)+","+QString::number(b));
    }
}

void MyMainWindow::keyPressEvent(QKeyEvent *event) {
    switch( event->key() ){
        case Qt::Key_Left: MyLabel->move(MyLabel->pos().x()-1,MyLabel->pos().y());
        a=MyLabel->pos().x()-1;
        b=MyLabel->pos().y();
        coord->setText(QString::number(a)+","+QString::number(b));
            break;
        case Qt::Key_Right: MyLabel->move(MyLabel->pos().x()+1,MyLabel->pos().y());
        a=(int)MyLabel->pos().x()+1;
        b=MyLabel->pos().y();
        coord->setText(QString::number(a)+","+QString::number(b));
            break;
        case Qt::Key_Up: MyLabel->move(MyLabel->pos().x(),MyLabel->pos().y()-1);
        a=MyLabel->pos().x();
        b=MyLabel->pos().y();
        coord->setText(QString::number(a)+","+QString::number(b));
            break;
        case Qt::Key_Down: MyLabel->move(MyLabel->pos().x(),MyLabel->pos().y()+1);
        a=MyLabel->pos().x();
        b=MyLabel->pos().y()+1;
        coord->setText(QString::number(a)+","+QString::number(b));
        break;
}
}


MyMainWindow::MyMainWindow() {
    MyLabel = new QLabel(this);
    MyLabel->setText("Hello World!");
    MyLabel->move(10, 20);
    QString xxx;
    a=MyLabel->pos().x();
    b=MyLabel->pos().y();

     //(*String)=MyLabel->text();

     xxx=MyLabel->text();
    //int duzina=xxx.length();
    String=&xxx;
    int duzina=(*String).length();


    FileSaveAs = new QAction(tr("&Save As..."), this);
    FileSaveAs->setShortcut(tr("CTRL+S"));
    connect(FileSaveAs, &QAction::triggered, this,&MyMainWindow::FileSaveAsMenu);

    FileOpen = new QAction(tr("&Open..."), this);
    FileOpen->setShortcut(tr("CTRL+O"));
    connect(FileOpen, &QAction::triggered, this,&MyMainWindow::FileOpenMenu);

    FileMenu = menuBar()->addMenu(tr("&File"));
    FileMenu->addAction(FileSaveAs);
    FileMenu->addAction(FileOpen);

    EditNoviTekst = new QAction(tr("&Novi tekst..."), this);
    EditNoviTekst->setShortcut(tr("CTRL+N"));
    connect(EditNoviTekst, &QAction::triggered, this,&MyMainWindow::EditNoviTekstMenu);

    EditMenu = menuBar()->addMenu(tr("&Edit"));
    EditMenu->addAction(EditNoviTekst);



    QStatusBar *statusBar = this->statusBar();


    coord = new QLabel( tr("  Pozicija  ") );
    length = new QLabel( tr(" Duzina  ") );




    coord->setMinimumSize( coord->sizeHint() );
    coord->setAlignment( Qt::AlignCenter );
    //coord->setText(QString::number(MyLabel->x())+","+QString::number(MyLabel->y()));
    coord->setText(QString::number(a)+","+QString::number(b));
    coord->setToolTip( tr("Koordinate teksta."));

    statusBar->addPermanentWidget( coord );

    length->setMinimumSize( length->sizeHint() );
    length->setAlignment( Qt::AlignCenter );


    length->setText(QString::number(duzina));

    length->setToolTip( tr("Govori nam duzinu teksta..."));

    statusBar->addWidget( length );
    statusBar->showMessage( tr("Ready"), 500 );

}
void MyMainWindow::FileSaveAsMenu(){
    QString fileName = QFileDialog::getSaveFileName(this,"Save As...", "", "Your File (*.ur)");

        if (!fileName.isEmpty()) {
            QFile file(fileName);
            if (!file.open(QIODevice::WriteOnly)) {
                QMessageBox::information(this,"Unable to Open File", file.errorString());
                return;
            }
            QTextStream out(&file);
            out << "fesb file" << endl;
            out << MyLabel->text() << endl;
            out << MyLabel->pos().x() << endl;
            out << MyLabel->pos().y() << endl;
            out << pos().x() << endl;
            out << pos().y() << endl;
            out << size().width() << endl;
            out << size().height() << endl;
        }
}
void MyMainWindow::FileOpenMenu(){
    QString fileName = QFileDialog::getOpenFileName(this,"Open Geometry...", "", "FESB File (*.fsb)");
    if (!fileName.isEmpty()) {
        QFile file(fileName);
        if (!file.open(QIODevice::ReadOnly)) {
            QMessageBox::information(this, "Unable to Open File", file.errorString());
            return;
        }
    QTextStream in(&file);
    QString str; str = in.readLine();
        if(str=="fesb file") {
            str = in.readLine();
            MyLabel->setText(str);
            int x, y, w, h;
            in >> x >> y;
            MyLabel->move(x, y);
            in >> x >> y >> w >> h;
            this->setGeometry(x, y, w, h);
        }
    }
}


void MyMainWindow::EditNoviTekstMenu() {
MyDialog dialog;
int ret = dialog.exec();
if( ret == QDialog::Accepted ) {
MyLabel->setText(dialog.lineEdit->text());
length->setText(QString::number(MyLabel->text().length()));

//String->append(dialog.lineEdit->text());

}
}

void MyMainWindow::paintEvent(QPaintEvent*){
QSize size = this->size();
QPainter painter(this);
painter.drawLine(0, size.height(), size.width(), 20);
}






int main(int argc, char **argv) {
    QApplication app (argc, argv);
    MyMainWindow mainWindow;
    mainWindow.resize(300,150);
    mainWindow.show();



    return app.exec();
}

At the same time there is a bunch of other variables that do not need to be global like a and b (just on a glance), there might be more. This will not impact your code speed or anything but will make it harder to maintain as it grows.

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