QPlainTextEdit - change shift+return behaviour - qt

Question

I use a QPlainTextEdit for a code editor that also shows line numbers.
But when I press shift+return a the editor makes a break, but the line number don't increases.
I think in html it would just be a <br/> instead of a new <p> tag...
Have a look at the screenshot...

Answer 1

You should probably be using QTextEdit since this is rich text we're talking about.
Override virtual void keyPressEvent ( QKeyEvent * e ). You can call QTextEdit::keyPressEvent in the implementation to delegate non-special cases.

Answer 2

You can, actually, use object with eventFilter and installEventFilter function.
#ifndef SHIFTENTERFILTER_H
#define SHIFTENTERFILTER_H
#include <QObject>
#include <QEvent>
#include <QKeyEvent>
class ShiftEnterFilter : public QObject
{
protected:
virtual bool eventFilter(QObject *, QEvent *event) {
if(event -> type() == QEvent::KeyPress)
{
QKeyEvent *keyEvent = static_cast <QKeyEvent> (event);
if((keyEvent -> modifiers() & Qt::ShiftModifier) && ((keyEvent -> key() == Qt::Key_Enter) || (keyEvent -> key() == Qt::Key_Return)))
return true;
}
return false;
}
public:
ShiftEnterFilter(QObject *parent = 0) : QObject(parent) {}
};
#endif
Just install this filter to your QPlainTextEdit
// code
ui -> plainTextEdit -> installEventFilter(new ShiftEnterFilter(this));
// code

Answer 3

Try this (CodeEdit inherits QPlainTextEdit):
/**
* override keyPressEvent, change behaviour of shift + enter(return)
* #brief CodeEdit::keyPressEvent
* #param event
*/
void CodeEdit::keyPressEvent(QKeyEvent *event)
{
QKeyEvent *keyEvent = static_cast<QKeyEvent*>(event);
// disable shift + enter(return)
if ((keyEvent->modifiers() & Qt::ShiftModifier) && (keyEvent->key() == Qt::Key_Enter || keyEvent->key() == Qt::Key_Return)) {
event->ignore();
return;
}
QPlainTextEdit::keyPressEvent(event);
}