在光标后面弹出

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QRect cr = cursorRect();
cr.setWidth(c->popup()->sizeHintForColumn(0)
            + c->popup()->verticalScrollBar()->sizeHint().width());
c->complete(cr);

TAG

在自动补全的后面添加一个用来标志类别的小tag

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QStandardItemModel *m = new QStandardItemModel(words.count(), 2, completer); // 设置为两列
for (int i = 0; i < words.count(); ++i) {
    QModelIndex countryIdx = m->index(i, 0);
    QModelIndex symbolIdx = m->index(i, 1);
    QString country = words[i].mid(0, words[i].length() - 2).trimmed();
    QString symbol = words[i].right(2);
    m->setData(countryIdx, country);
    m->setData(symbolIdx, symbol);
}
completer->setModel(m);

Model 示例

文件路径全部显示的model

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class FileSystemModel : public QFileSystemModel
{
public:
    FileSystemModel(QObject *parent = 0);
    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const Q_DECL_OVERRIDE;
};
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FileSystemModel::FileSystemModel(QObject *parent)
    : QFileSystemModel(parent)
{
}
QVariant FileSystemModel::data(const QModelIndex &index, int role) const
{
    if (role == Qt::DisplayRole && index.column() == 0) {
        QString path  = QDir::toNativeSeparators(filePath(index));
        if (path.endsWith(QDir::separator()))
            path.chop(1);
        return path;
    }

    return QFileSystemModel::data(index, role);
}

焦点设置

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void TextEdit::focusInEvent(QFocusEvent *e)
{
    if (c) c->setWidget(this);
    QTextEdit::focusInEvent(e);
}

选中事件

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void MainWindow::sloHighlight(const QModelIndex &index)
{
    QAbstractItemModel *completionModel = completer->completionModel();
    QAbstractProxyModel *proxy = qobject_cast<QAbstractProxyModel *>(completionModel);
    if (!proxy)
        return;
    QModelIndex sourceIndex = proxy->mapToSource(index);
    treeView->selectionModel()->select(sourceIndex, QItemSelectionModel::ClearAndSelect | QItemSelectionModel::Rows);
    treeView->scrollTo(index);
}