Always blinking cursor and act like readonly on QLineEdit

kocka

I would like to create a LineEdit with an always blinking cursor. I also have two push-button which can move the cursor back and forth. If I click on the mainwindow I also would like to keep the blinking cursor and also if I am clicking on the push-button. I would like to also disable clicking into the text area.

So basically LineEdit with setReadyOnly true, with always blinking cursor.

I have created a custom LineEdit which inherit from QLineEdit:

class lineEdit : public QLineEdit {

    Q_OBJECT

public:

    lineEdit(QWidget* parent=nullptr)
        : QLineEdit(parent) {}

    virtual void keyPressEvent(QKeyEvent* event) {
        event->ignore();
    }

};

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent), ui(new Ui::MainWindow) {

    ui->setupUi(this);

    QWidget *window = new QWidget;

    lineEdit* line = new lineEdit(window);
    line->setGeometry(0,0,300,100);
    line->setStyleSheet("font-size: 24px");
    line->setText("asdfgh");

    QPushButton* buttonBackward = new QPushButton(window);
    buttonBackward->setGeometry(0,100,50,50);
    buttonBackward->setText("<-");
    //Keep blinking if I click on the push-button
    buttonBackward->setFocusPolicy(Qt::NoFocus);
    connect(buttonBackward, &QPushButton::clicked, this, [=]{MainWindow::moveCursorBackward(line);});

    QPushButton* buttonForward = new QPushButton(window);
    buttonForward->setGeometry(50,100,50,50);
    buttonForward->setText("->");
    buttonForward->setFocusPolicy(Qt::NoFocus);
    connect(buttonForward, &QPushButton::clicked, this, [=]{MainWindow::moveCursorForward(line);});

    setCentralWidget(window);

}

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

void MainWindow::moveCursorBackward(lineEdit* l) {
    l->cursorBackward(false,1);
}

void MainWindow::moveCursorForward(lineEdit *l) {
    l->cursorForward(false,1);
}

Now I cannot add text to the LineEdit, the blinking cursor never stops and I also can move the cursor back and forth.
How could I disable clicking into the text area, disable highlight the text, disable move the cursor by clicking into the text area, disable copying the text?

kocka

@CP71

right-clicking problem:

line->setContextMenuPolicy(Qt::NoContextMenu);

mouse problem:

virtual void mousePressEvent(QMouseEvent *event) override {
        event->ignore();
    }

highlight problem :

QPalette palette;
palette.setColor(QPalette::Highlight, lineEdit->palette().color(QPalette::Base));
palette.setColor(QPalette::HighlightedText, lineEdit->palette().color(QPalette::Text));
lineEdit->setPalette(palette);

mrjj

@kocka

Hi
You can try override the
mousePressEvent(QMouseEvent *e)

https://doc.qt.io/qt-5/qwidget.html#mousePressEvent

and do nothing.

kocka

virtual void mousePressEvent(QMouseEvent *event) override {
        event->ignore();
    }

That is working for me but there is some problem.

Double left-click highlight the whole text and I also would like to disable right-click on the text area.

CP71

@mrjj
Did you read this?

https://forum.qt.io/topic/105953/force-always-blinking-cursor-on-qlineedit

Maybe it could be helpful

kocka

@CP71

Yes, I read that.

Now I finally find a solution to the right-clicking problem

line->setContextMenuPolicy(Qt::NoContextMenu);

But unfortunately, I cannot find the solution to the highlights problem. I have also tried qt forum link, but it does not work for me.

virtual void focusInEvent(QFocusEvent *e) override {
        QLineEdit::focusInEvent(e);
        deselect();
    }

kocka

@CP71

right-clicking problem:

line->setContextMenuPolicy(Qt::NoContextMenu);

mouse problem:

virtual void mousePressEvent(QMouseEvent *event) override {
        event->ignore();
    }

highlight problem :

QPalette palette;
palette.setColor(QPalette::Highlight, lineEdit->palette().color(QPalette::Base));
palette.setColor(QPalette::HighlightedText, lineEdit->palette().color(QPalette::Text));
lineEdit->setPalette(palette);