Qt assign lines from textfile to qlabels - c++

Question

What works so far: opening a textfile via QFileDialog and showing the contents of the textfile in a Qlabel(showfile).
I too have a for-loop that counts how many \n are in the textfile.
Now what I want is that line after line in the textfile is assigned to a new Qlabel meaning each Qlabel contains one line of the textfile and place it dynamically on runtime.
Maybe you can help since I´m a little stuck here.
Here´s my qwidget class where the labels should be placed:
class mywidget:public QWidget //class for displaying everything
{
Q_OBJECT
private:
QGridLayout *area;
QLabel *showfile; //shows input from textfile
QLabel *processname,*status; //captionlabel
QFont *pfont,*sfont; //fontoption for processname&status
QLabel **processes; //2D array to dynamically create QLabels for each entry in file
public:
mywidget(QWidget *parent = Q_NULLPTR, Qt::WindowFlags flags = 0):QWidget(parent,flags)
{
this->area = new QGridLayout(this);
this->showfile = new QLabel(tr("Test"),this);
this->pfont = new QFont();
this->pfont->setPixelSize(20);
this->sfont = new QFont();
this->sfont->setPixelSize(20);
this->processname = new QLabel(tr("Process_Name:"),this);
this->processname->setFont(*pfont);
this->status = new QLabel(tr("Status:"),this);
this->status->setFont(*sfont);
this->area->addWidget(this->processname,0,0,Qt::AlignHCenter);
this->area->addWidget(this->status,0,1,Qt::AlignHCenter);
this->area->addWidget(this->showfile,1,0,Qt::AlignHCenter);
this->area->setSpacing(10);
}
~mywidget()
{
delete this->area;
delete this->showfile;
delete this->pfont;
delete this->sfont;
delete this->processname;
delete this->status;
}
friend class mywindow;
};
And here is my open-method from QMainwindow class:
void mywindow::oeffnen()
{
this->openfilename = QFileDialog::getOpenFileName //open textfile dialog
(this,
tr("Datei öffnen"),
QDir::homePath(),
"Textdateien (*.txt *.docx *.doc);;" "Alle Dateien (*.*)"
);
if(!this->openfilename.isEmpty())
{
this->file = new QFile(this->openfilename);
this->file->open(QIODevice::ReadOnly);
this->stream = new QTextStream(this->file);
this->fileread = this->stream->readAll();
for(int z = 0;z<this->fileread.length();++z) //check entries in string by counting \n
{
this->eintraege = this->fileread.count(QRegExp("\n"));
}
//this->s_eintraege = QString::number(this->eintraege); //converting to string for displaying
this->central->showfile->setText(this->fileread); //assign filecontent to label
if(!this->file->isReadable())
{
QMessageBox::information(this,
tr("Fehler"),
tr("Konnte Datei %1 nicht laden!").arg(this->openfilename)
);
}
else
{
QMessageBox::information(this,
tr("OK"),
tr("Konnte Datei %1 laden!").arg(this->openfilename)
);
}
this->file->close();
}
}

Answer 1

You can add a new QLabel into a layout for each new line you read from a file. You can store the labels in a container like QVector so you can access their text later on. Here is an example:
#include <QApplication>
#include <QWidget>
#include <QLabel>
#include <QFile>
#include <QLayout>
#include <QTextStream>
#include <QDebug>
class DisplayWidget : public QWidget
{
Q_OBJECT
public:
DisplayWidget(QWidget *parent = 0) : QWidget(parent)
{
labelLayout = new QVBoxLayout;
setLayout(labelLayout);
resize(200, 200);
}
void addLabel(const QString &text)
{
QLabel *label = new QLabel(text);
label_vector.append(label);
labelLayout->addWidget(label);
}
void readFile(const QString &filename)
{
QFile file(filename);
if(!file.open(QIODevice::ReadOnly | QIODevice::Text))
return;
QTextStream ts(&file);
while(!ts.atEnd())
{
QString line = ts.readLine();
if(!line.isEmpty())
addLabel(line);
}
}
QString getLabelText(int index)
{
if(label_vector.size() > index)
return label_vector[index]->text();
return QString();
}
private:
QVBoxLayout *labelLayout;
QVector<QLabel*> label_vector;
};
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
DisplayWidget w;
w.readFile("somefile.txt");
w.show();
qDebug() << w.getLabelText(3);
return a.exec();
}
#include "main.moc"