1、概述
源码放在文章末尾

该项目实现了在输入框中输入部分信息能全部展现之前的历史输入信息，支持历史搜索和关键词匹配，项目demo演示如下所示：

项目部分代码如下所示：

#include "historymodel.h"
#include <QMultiMap>HistoryModel::HistoryModel()
{/*** @note historyData <QList>* 用于存储历史记录。* 可自由填充，我这里直接手动填充了。*/qsrand(uint(time(nullptr)));for (int i = 0; i < 20; ++i) {QString randStr;for (int j = 0; j < 10; ++j) {randStr += QString::number(qrand() % 10);}m_historyData.push_back(randStr);}m_data = m_historyData;
}int HistoryModel::rowCount(const QModelIndex &parent) const
{Q_UNUSED(parent);return m_data.count();
}int HistoryModel::columnCount(const QModelIndex &parent) const
{Q_UNUSED(parent);return 1;
}QVariant HistoryModel::data(const QModelIndex &index, int role) const
{if (index.row() < 0 || index.row() >= m_data.count())return QVariant();switch (role) {case Qt::DisplayRole:return m_data.at(index.row());default:break;}return QVariant();
}void HistoryModel::sortByKey(const QString &key)
{if (key.isEmpty()) {beginResetModel();m_data = m_historyData;endResetModel();} else {QMultiMap<int, QString> temp;for (auto str : m_historyData) {int ret = str.indexOf(key);if (ret == -1) continue;else temp.insert(ret, str);}beginResetModel();m_data.clear();if (!temp.isEmpty()) {//也可 for range-basedfor (auto it = temp.begin(); it != temp.end(); it++) {m_data.push_back(it.value());}}endResetModel();}
}

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