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copied!<p>you should be able to force completer's popup window to get shown once your line edit text is erased by using <a href="http://doc.qt.nokia.com/latest/qcompleter.html#complete" rel="noreferrer">QCompliter::complete</a> slot:</p> <pre><code>lineEdit->completer()->complete(); </code></pre> <p>Here's how you can do it:</p> <ul> <li>define textChanged slot for your lineedit; </li> <li>override customEvent method for your window; </li> <li>in the textChanged slot send user event to the window whenever lineedit's text has zero length; </li> <li>in the customEvent method show completer whenever user event is received;</li> </ul> <p>Below is an example:</p> <p>mainwindow.h:</p> <pre><code>class MainWindow : public QMainWindow { Q_OBJECT public: explicit MainWindow(QWidget *parent = 0); ~MainWindow(); protected: void customEvent(QEvent * event); private: Ui::MainWindow *ui; private slots: void on_lineEdit_textChanged(QString ); }; </code></pre> <p>mainwindow.cpp:</p> <pre><code>class CompleteEvent : public QEvent { public: CompleteEvent(QLineEdit *lineEdit) : QEvent(QEvent::User), m_lineEdit(lineEdit) { } void complete() { m_lineEdit->completer()->complete(); } private: QLineEdit *m_lineEdit; }; MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); QStringList wordList; wordList << "one" << "two" << "three" << "four"; QLineEdit *lineEdit = new QLineEdit(this); lineEdit->setGeometry(20, 20, 200, 30); connect(lineEdit, SIGNAL(textChanged(QString)), SLOT(on_lineEdit_textChanged(QString ))); QCompleter *completer = new QCompleter(wordList, this); completer->setCaseSensitivity(Qt::CaseInsensitive); completer->setCompletionMode(QCompleter::UnfilteredPopupCompletion); lineEdit->setCompleter(completer); } MainWindow::~MainWindow() { delete ui; } void MainWindow::customEvent(QEvent * event) { QMainWindow::customEvent(event); if (event->type()==QEvent::User) ((CompleteEvent*)event)->complete(); } void MainWindow::on_lineEdit_textChanged(QString text) { if (text.length()==0) QApplication::postEvent(this, new CompleteEvent((QLineEdit*)sender())); } </code></pre> <p>hope this helps, regards</p>

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