轻量级Qt键盘-中文输入

class ChineseWidget : public QListWidget {
    Q_OBJECT
public:
    ChineseWidget(QWidget *parent = NULL);
    void setText(const QString &text);

signals:
    void pressedChanged(const int &code, const QString &text);
...
};

setFocusPolicy(Qt::NoFocus);
/* 设置为列表显示模式 */
setViewMode(QListView::ListMode);

/* 从左往右排列 */
setFlow(QListView::LeftToRight);

/* 屏蔽水平滑动条 */
setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

/* 屏蔽垂直滑动条 */
setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

/* 设置为像素滚动 */
setHorizontalScrollMode(QListWidget::ScrollPerPixel);

/* 设置鼠标左键拖动 */
QScroller::grabGesture(this, QScroller::LeftMouseButtonGesture);

/* 设置样式 */
setStyleSheet(R"(
                QListWidget { outline: none; border:1px solid #00000000; color: black; }
                QListWidget::Item { width: 50px; height: 50px; }
                QListWidget::Item:hover { background: #4395ff; color: white; }
                QListWidget::item:selected { background: #4395ff; color: black; }
                QListWidget::item:selected:!active { background: #00000000; color: black; }
              )");

QFile pinyin(":/ChineseLib/PinYin");
if (! pinyin.open(QIODevice::ReadOnly)) {
    qDebug() << "Open pinyin file failed!";
    return;
}

while (! pinyin.atEnd()) {
    QString buf = QString::fromUtf8(pinyin.readLine()).trimmed();
    QRegExp regExp("^[\u4E00-\u9FA5]+");

    int index = regExp.indexIn(buf);
    if (index == -1)
        continue;

    QString first = buf.right(buf.size() - regExp.matchedLength()); // 分离拼音字母
    QString second = buf.mid(index, regExp.matchedLength()); // 分离中文

    QList<QPair<QString, QString>> &tmp = m_data[first.left(1)]; // 取首字母做索引
    tmp.append(qMakePair(first, second));
}

安a
按a
爱a
阿a
暗a
啊a
埃a
碍a
凹a
奥a
岸a
矮a
案a
俺a

const QList<QPair<QString, QString>> &tmp = m_data[text.left(1)];
for (const QPair<QString, QString> &each : tmp) {
    if (each.first != text) // 匹配是否符合的在容器里面拼音
        continue;

    addOneItem(each.second);
}