Using QCompleter with a virtual keypad

[NCDeveloper]

The behavior of QCompleter is preventing me from using it with the virtual keypad I have created. When the QCompleter's popup is showing, a press on the keypad closes the completer, and a second press is required to enter a character. Is there any way to change the behavior of the completer so that clicks outside of the popup window are ignored?

[SGaist]

Hi and welcome to devnet,

How are you using it exactly ?

[NCDeveloper]

I'm using it with a QLineEdit in PopupCompletion mode. Next to the QLineEdit I have a button that forces the popup to show with all possible completions. The button part of it was the functionality I was really after. The fact that it pops up while the user is typing would be a nice touch if it worked correctly, but it's not a requirement I have.

[SGaist]

How are you implementing your virtual keypad ?

This article might be interest for a more integrated solution.

[NCDeveloper]

I'm not sure how a re-implementation of my keypad will solve the issue with the completer popup.

[mrjj]

@NCDeveloper

if your goal is to just make it stay open, you can do the following

class openCompleter : public QCompleter {
  Q_OBJECT
 public:
  openCompleter(QObject* parent) : QCompleter(parent) {}
  virtual ~openCompleter() override {}
 protected:
  bool eventFilter(QObject* o, QEvent* e) override {   
    if ( e->type() == QEvent::Type::MouseButtonPress) {
        qDebug() << " event is hide: " << o->metaObject()->className();
        return false;
    }
    return QCompleter::eventFilter(o, e);
  }
};

and just use openCompleter and not QCompleter.
However, you will need some way for user to cancel the popup then.

[SGaist]

I don't know how you implemented your virtual keypad, the article I linked to proposes an implementation that integrates directly with Qt's input system.