Qt connect QScrollBar with QLineEdit - qt

Question

I would like to "activate" the scrollbar when the lineedit text is too long to display on the window. I have already done it.
I want to move the cursor with the scrollbar. I also want to modify the scroll bar slider length with the increment/decrement of the text length.
.h
private:
Ui::MainWindow *ui;
QLineEdit* LineEdit;
QScrollBar* hScrollBar;
void HDScrollBar();
constructor:
resize(400,100);
LineEdit = new QLineEdit(this);
LineEdit->resize(400,100);
LineEdit->setFont(QFont("Times",20));
hScrollBar = new QScrollBar(Qt::Horizontal, LineEdit);
hScrollBar->resize(400,20);
hScrollBar->move(0,80);
hScrollBar->hide();
connect(LineEdit, &QLineEdit::textChanged, this, &MainWindow::HDScrollBar);
hide/display scrollbar
void MainWindow::HDScrollBar() {
QFont myFont(QFont("Times",20));;
QString str = LineEdit->text();
QFontMetrics fm(myFont);
int width = fm.horizontalAdvance(str);
(width >= 400) ? hScrollBar->show() : hScrollBar->hide();
}

Answer 1

As for the first part, you use can scrollbar's valueChanged signal, e.g. this way:
connect(ui->horizontalScrollBar, &QScrollBar::valueChanged, ui->lineEdit, [&](int v) {
auto scrollbarAt = static_cast<double>(v) / ui->horizontalScrollBar->maximum();
auto cursorTo = std::round(ui->lineEdit->text().length() * scrollbarAt);
ui->lineEdit->setCursorPosition(cursorTo);
});
EDIT:
as for the latter part:
you can either alter the PageStep of the scrollbar, or you can set it to 1 and alter its maximum value, then also the first part should simplify:
ui->horizontalScrollBar->setPageStep(1);
ui->horizontalScrollBar->setMaximum(ui->lineEdit.text().length());
connect(ui->horizontalScrollBar, &QScrollBar::valueChanged,
ui->lineEdit, &QLineEdit::setCursorPosition);
//this can also ben done on textChanged, however for the price
//of more frequent execution...
connect(ui->lineEdit, &QLineEdit::cursorPositionChanged,
ui->horizontalScrollBar, [&](int, int n) {
ui->horizontalScrollBar->setMaximum(ui->lineEdit->text().length());
//...one gets the easy way to track the cursor
//with the slider
ui->horizontalScrollBar->setValue(n);
});