Messa a fuoco su QLineEdit mentre mostra la vista QListView

Question

In Qt, c'è una classe QCompleter che fornisce funtionanity completamento automatico. Voglio usare QListView per completare la stessa cosa. Nel codice seguente, quando il QListView mostra, QLineEdit verrà perdere la concentrazione. Come ho potuto mantenere l'attenzione di QLineEdit?

1) mdict.h :

#include <QtGui/QWidget>

class QLineEdit;
class QListView;
class QModelIndex;

class mdict : public QWidget
{
    Q_OBJECT

public:
    mdict(QWidget *parent = 0);
    ~mdict() {}

private slots:
    void on_textChanged(const QString &);
    void completeText(const QModelIndex &);

private:
    QLineEdit *mLineEdit;
    QListView *mView;
};

2) mdict.cpp

#include <cassert>
#include <QtGui>
#include "mdict.h"

mdict::mdict(QWidget *parent) : QWidget(parent), mLineEdit(0), mView(0)
{
    mLineEdit = new QLineEdit(this);

    QVBoxLayout *layout = new QVBoxLayout(this);
    layout->addWidget(mLineEdit);
    layout->addStretch(100);
    setLayout(layout);

    QStringList stringList;
    stringList << "m0" << "m1" << "m2";
    QStringListModel *model = new QStringListModel(stringList);
    mView = new QListView(this);
    mView->setModel(model);
    mView->setEditTriggers(QAbstractItemView::NoEditTriggers);
    mView->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    mView->setSelectionBehavior(QAbstractItemView::SelectRows);
    mView->setSelectionMode(QAbstractItemView::SingleSelection);
    mView->setParent(0, Qt::Popup);
    mView->setFocusPolicy(Qt::NoFocus);
    mView->setFocusProxy(mLineEdit);

    connect(mLineEdit, SIGNAL(textChanged(const QString&)), 
        this, SLOT(on_textChanged(const QString &)));
    connect(mView, SIGNAL(activated(const QModelIndex &)),
        this, SLOT(completeText(const QModelIndex &)));
    connect(mView, SIGNAL(clicked(const QModelIndex &)),
        this, SLOT(completeText(const QModelIndex &)));
}

void mdict::on_textChanged(const QString &text)
{
    int lineEidtWidth = mLineEdit->width();
    mView->setMinimumWidth(lineEidtWidth);
    mView->setMaximumWidth(lineEidtWidth);
    mView->setMaximumHeight(60);

    QPoint p(0, mLineEdit->height());
    int x = mLineEdit->mapToGlobal(p).x();
    int y = mLineEdit->mapToGlobal(p).y();
    mView->move(x, y);
    mView->show();
}

void mdict::completeText(const QModelIndex &index)
{
    mLineEdit->setText(index.data().toString());
    mView->hide();
}

3) main.cpp

#include "mdict.h"

#include <QtGui>
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    mdict w;
    w.show();
    return a.exec();
}

Answer 1

Usa Qt::ToolTip invece di Qt::Popup, in questo modo:

mView->setParent(0, Qt::ToolTip);