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copied!<p>Here is my solution based on serge_gubenko's answer. This class uses QStringListModel, but it can be easily replaced with any other model.</p> <p><code>Completer_line_edit.h</code></p> <pre><code>#include <QLineEdit> #include <QStringListModel> #include <QTimer> /*! Line edit widget with auto completion based on QStringListModel. Modified behaviour: completion list will appear even when contents of line edit is empty. Full list of options will be showed when line edit has focus and is empty. */ class Completer_line_edit : public QLineEdit { Q_OBJECT public: explicit Completer_line_edit(QWidget *parent = 0); //! Set list of options used for copmletion. inline void set_list(QStringList list) { model.setStringList(list); } private: QStringListModel model; void focusInEvent(QFocusEvent *e); void customEvent(QEvent* e); QTimer timer; private slots: void slot_text_edited(); void slot_call_popup(); }; </code></pre> <p><code>Completer_line_edit.cpp</code></p> <pre><code>#include "Completer_line_edit.h" #include <QCompleter> #include <QEvent> #include <QApplication> Completer_line_edit::Completer_line_edit(QWidget *parent) : QLineEdit(parent) { setCompleter(new QCompleter()); completer()->setModel(&model); completer()->setCompletionMode(QCompleter::PopupCompletion); completer()->setCaseSensitivity(Qt::CaseInsensitive); connect(this, SIGNAL(textEdited(QString)), this, SLOT(slot_text_edited())); } void Completer_line_edit::focusInEvent(QFocusEvent *e) { QLineEdit::focusInEvent(e); // force completion when line edit is focued in completer()->complete(); } void Completer_line_edit::slot_text_edited() { qDebug() << "text edited"; // force to show all items when text is empty completer()->setCompletionMode(text().isEmpty()? QCompleter::UnfilteredPopupCompletion: QCompleter::PopupCompletion); if (text().isEmpty()) { // completion list will be hidden now; we will show it again after a delay timer.singleShot(100, this, SLOT(slot_call_popup())); } } void Completer_line_edit::slot_call_popup() { // apparently, complete() works only in event handler QApplication::postEvent(this, new QEvent(QEvent::User)); } void Completer_line_edit::customEvent(QEvent *e) { QLineEdit::customEvent(e); // force completion after text is deleted completer()->complete(); } </code></pre>

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