Expand cursor length QLineEdit? - c++

Question

I'd like to take a normal QLineEdit, and change the shape of the cursor. So with a subclass like so:
class myLineEdit : public QLineEdit
{
Q_OBJECT
signals:
public:
explicit myLineEdit(QWidget * parent = 0)
{
}
protected:
};
And make it so that the cursor is several pixels wide, like that of a Linux terminal. By default, the cursor to indicate text position is very slim.
I assume I need to override something in the paintevent()? What exactly in the paintevent would be responsible for drawing the single pixel blinking line QLineEdit() defaults to? I could not find this information in the documentation.

Answer 1

Use a Qproxystyle:
#include <QtWidgets>
class LineEditStyle: public QProxyStyle
{
Q_OBJECT
Q_PROPERTY(int cursorWidth READ cursorWidth WRITE setCursorWidth)
public:
using QProxyStyle::QProxyStyle;
int cursorWidth() const{
if(m_cursor_width < 0)
return baseStyle()->pixelMetric(PM_TextCursorWidth);
return pixelMetric(PM_TextCursorWidth);
}
void setCursorWidth(int cursorWidth){
m_cursor_width = cursorWidth;
}
int pixelMetric(QStyle::PixelMetric metric, const QStyleOption *option = nullptr, const QWidget *widget = nullptr) const override
{
if(metric == PM_TextCursorWidth)
if(m_cursor_width > 0)
return m_cursor_width;
return QProxyStyle::pixelMetric(metric, option, widget);
}
private:
int m_cursor_width = -1;
};
class LineEdit: public QLineEdit
{
Q_OBJECT
public:
LineEdit(QWidget *parent = nullptr):
QLineEdit(parent)
{
LineEditStyle *new_style = new LineEditStyle(style());
new_style->setCursorWidth(10);
setStyle(new_style);
}
};
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
LineEdit w;
w.show();
return a.exec();
}
#include "main.moc"