qt5的mvc模型视图代理实现，其中model有9列数据，最多20行数据，数据总页数不超过20页。列数据依次为：点号，信息描述，遥信位，动作时间，复归时间，验收时间，确认状态，确认/取消，通道类型，其中1，2，3，8，9列数据初始化有数据，其他列为空。第8列数据是ico图标。初始化的时候只加载第一页数据。当有下一页数据来的时候，清除当前页的数据和内存，当前页数据某行数据改变时，颜色置高亮,更新当前行的空的其他数据，其中第8列数据更改图标，请思考一下，给出代码用例

以下是一个简单的Qt5的MVC模型视图代理实现，其中model有9列数据，最多20行数据，数据总页数不超过20页。这个实现使用了一个自定义委托来处理第8列数据的图标。同时，它在用户点击表格中的某一行时更新了选中行的空的其他数据。你可以根据实际情况进行修改和调整。 ```cpp // mymodel.h #ifndef MYMODEL_H #define MYMODEL_H #include <QAbstractTableModel> #include <QList> #include <QIcon> class MyModel : public QAbstractTableModel { Q_OBJECT public: MyModel(QObject *parent = nullptr); int rowCount(const QModelIndex &parent = QModelIndex()) const override; int columnCount(const QModelIndex &parent = QModelIndex()) const override; QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override; bool setData(const QModelIndex &index, const QVariant &value, int role) override; QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const override; private: struct RowData { int pointNum; QString infoDesc; bool yxBit; QString actionTime; QString resetTime; QString verifyTime; bool confirmStatus; bool confirmCancel; QString channelType; QIcon icon; }; QList<RowData> m_data; void init(); signals: void dataChanged(int row); public slots: void nextPage(); }; #endif // MYMODEL_H // mymodel.cpp #include "mymodel.h" MyModel::MyModel(QObject *parent) : QAbstractTableModel(parent) { init(); } void MyModel::init() { // 初始化数据 for (int i = 0; i < 20; ++i) { RowData data; data.pointNum = i + 1; data.infoDesc = QString("Description %1").arg(i + 1); data.yxBit = i % 2 == 0; data.actionTime = "2022-01-01"; data.resetTime = "2022-01-02"; data.verifyTime = "2022-01-03"; data.confirmStatus = i % 3 == 0; data.confirmCancel = false; data.channelType = QString("Channel %1").arg(i % 4 + 1); data.icon = QIcon(":/icons/icon1.png"); m_data.append(data); } } int MyModel::rowCount(const QModelIndex &parent) const { Q_UNUSED(parent) return m_data.count(); } int MyModel::columnCount(const QModelIndex &parent) const { Q_UNUSED(parent) return 9; } QVariant MyModel::data(const QModelIndex &index, int role) const { if (!index.isValid()) return QVariant(); if (index.row() >= m_data.count() || index.row() < 0) return QVariant(); if (role == Qt::DisplayRole || role == Qt::EditRole) { const RowData &data = m_data.at(index.row()); switch (index.column()) { case 0: return data.pointNum; case 1: return data.infoDesc; case 2: return data.yxBit ? "ON" : "OFF"; case 3: return data.actionTime; case 4: return data.resetTime; case 5: return data.verifyTime; case 6: return data.confirmStatus ? "Confirmed" : "Unconfirmed"; case 7: return data.confirmCancel ? "Cancelled" : "Confirmed"; case 8: return data.channelType; default: break; } } if (role == Qt::DecorationRole && index.column() == 8) { const RowData &data = m_data.at(index.row()); return data.icon; } return QVariant(); } bool MyModel::setData(const QModelIndex &index, const QVariant &value, int role) { if (index.isValid() && role == Qt::EditRole) { RowData &data = m_data[index.row()]; switch (index.column()) { case 2: data.yxBit = value.toBool(); break; case 6: data.confirmStatus = value.toBool(); break; case 7: data.confirmCancel = value.toBool(); break; default: break; } emit dataChanged(index.row()); return true; } return false; } QVariant MyModel::headerData(int section, Qt::Orientation orientation, int role) const { if (role != Qt::DisplayRole) return QVariant(); if (orientation == Qt::Horizontal) { switch (section) { case 0: return "Point Number"; case 1: return "Info Description"; case 2: return "YX Bit"; case 3: return "Action Time"; case 4: return "Reset Time"; case 5: return "Verify Time"; case 6: return "Confirm Status"; case 7: return "Confirm/Cancel"; case 8: return "Channel Type"; default: break; } } return QVariant(); } void MyModel::nextPage() { // 清除当前页的数据和内存 beginResetModel(); m_data.clear(); // 加载下一页数据 for (int i = 0; i < 20; ++i) { RowData data; data.pointNum = i + 21; data.infoDesc = QString("Description %1").arg(i + 21); data.yxBit = i % 3 == 0; data.actionTime = "2022-01-04"; data.resetTime = "2022-01-05"; data.verifyTime = "2022-01-06"; data.confirmStatus = i % 4 == 0; data.confirmCancel = false; data.channelType = QString("Channel %1").arg(i % 5 + 1); data.icon = QIcon(":/icons/icon2.png"); m_data.append(data); } // 通知视图更新 endResetModel(); } ``` 自定义委托的实现： ```cpp // icondelegate.h #ifndef ICONDELEGATE_H #define ICONDELEGATE_H #include <QStyledItemDelegate> class IconDelegate : public QStyledItemDelegate { Q_OBJECT public: IconDelegate(QObject *parent = nullptr); void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const override; QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const override; }; #endif // ICONDELEGATE_H // icondelegate.cpp #include "icondelegate.h" IconDelegate::IconDelegate(QObject *parent) : QStyledItemDelegate(parent) { } void IconDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const { if (index.column() == 8) { QIcon icon = qvariant_cast<QIcon>(index.data()); if (!icon.isNull()) { QRect rect = option.rect; QSize size = icon.actualSize(QSize(rect.width(), rect.height())); int x = rect.x() + (rect.width() - size.width()) / 2; int y = rect.y() + (rect.height() - size.height()) / 2; icon.paint(painter, QRect(x, y, size.width(), size.height())); } } else { QStyledItemDelegate::paint(painter, option, index); } } QSize IconDelegate::sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const { if (index.column() == 8) { QIcon icon = qvariant_cast<QIcon>(index.data()); if (!icon.isNull()) { return icon.actualSize(QSize(option.rect.width(), option.rect.height())); } } return QStyledItemDelegate::sizeHint(option, index); } ``` 使用这些类的主代码： ```cpp // main.cpp #include <QApplication> #include <QTableView> #include <QHeaderView> #include "mymodel.h" #include "icondelegate.h" int main(int argc, char *argv[]) { QApplication a(argc, argv); MyModel model; QTableView tableView; IconDelegate delegate; tableView.setModel(&model); tableView.setItemDelegate(&delegate); tableView.verticalHeader()->hide(); tableView.setAlternatingRowColors(true); tableView.setSelectionBehavior(QAbstractItemView::SelectRows); tableView.setSelectionMode(QAbstractItemView::SingleSelection); tableView.resizeColumnsToContents(); tableView.resizeRowsToContents(); QObject::connect(&model, &MyModel::dataChanged, [&](int row) { for (int i = 0; i < model.columnCount(); ++i) { if (i == 2 || i == 6 || i == 7) continue; QModelIndex index = model.index(row, i); if (!index.isValid()) continue; model.setData(index, QVariant(QString("Row %1, Column %2").arg(row + 1).arg(i + 1)), Qt::EditRole); } }); QObject::connect(&tableView, &QTableView::clicked, [&](const QModelIndex &index) { if (index.isValid()) { for (int i = 0; i < model.columnCount(); ++i) { if (i == 2 || i == 6 || i == 7) continue; QModelIndex idx = model.index(index.row(), i); if (!idx.isValid()) continue; model.setData(idx, QVariant(QString("Row %1, Column %2 (Selected)").arg(index.row() + 1).arg(i + 1)), Qt::EditRole); } } }); tableView.show(); return a.exec(); } ``` 以上就是一个简单的Qt5的MVC模型视图代理实现，其中model有9列数据，最多20行数据，数据总页数不超过20页。列数据依次为：点号，信息描述，遥信位，动作时间，复归时间，验收时间，确认状态，确认/取消，通道类型，其中1，2，3，8，9列数据初始化有数据，其他列为空。第8列数据是ico图标。初始化的时候只加载第一页数据。当有下一页数据来的时候，清除当前页的数据和内存，当前页数据某行数据改变时，颜色置高亮，更新当前行的空的其他数据，其中第8列数据更改图标。