How can I change color of part of the text in QLineEdit?

Question

I want to add some syntax highlighting to text being written in QLineEdit, but it does not support rich text formatting, I can not change QlineEdit to something else, so I should find how to set color of text in this widget.

Is there a way to do this?

Answer 1

Just found a neat trick for that.

static void setLineEditTextFormat(QLineEdit* lineEdit, const QList<QTextLayout::FormatRange>& formats) {     if(!lineEdit)         return;      QList<QInputMethodEvent::Attribute> attributes;     foreach(const QTextLayout::FormatRange& fr, formats)     {         QInputMethodEvent::AttributeType type = QInputMethodEvent::TextFormat;         int start = fr.start - lineEdit->cursorPosition();         int length = fr.length;         QVariant value = fr.format;         attributes.append(QInputMethodEvent::Attribute(type, start, length, value));     }     QInputMethodEvent event(QString(), attributes);     QCoreApplication::sendEvent(lineEdit, &event); }  static void clearLineEditTextFormat(QLineEdit* lineEdit) {     setLineEditTextFormat(lineEdit, QList<QTextLayout::FormatRange>()); }  // Usage example: QLineEdit* lineEdit = new QLineEdit; lineEdit->setText(tr("Task Tracker - Entry"));  QList<QTextLayout::FormatRange> formats;  QTextCharFormat f;  f.setFontWeight(QFont::Bold); QTextLayout::FormatRange fr_task; fr_task.start = 0; fr_task.length = 4; fr_task.format = f;  f.setFontItalic(true); f.setBackground(Qt::darkYellow); f.setForeground(Qt::white); QTextLayout::FormatRange fr_tracker; fr_tracker.start = 5; fr_tracker.length = 7; fr_tracker.format = f;  formats.append(fr_task); formats.append(fr_tracker);  setLineEditTextFormat(lineEdit, formats);