QTableView效率优化3 - 自定义Model的内容补充

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已于 2022-03-18 16:18:11 修改

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分类专栏： Qt 文章标签： qt qtableview

于 2022-03-18 16:05:31 首次发布

本文链接：https://blog.youkuaiyun.com/qq_37996632/article/details/123575790

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在上一篇文章 - QTableView效率优化2中https://blog.youkuaiyun.com/qq_37996632/article/details/123551325?spm=1001.2014.3001.5501，继承QAbstractTableModel自定义了一个简陋的table model，虽然能快速加载出10w,100w级别的数据，但是本身并没有任何接口。想要这个model正常使用，一般来说还需要加上这么几个接口：

setItemText() - 为指定的单元格（QModelIndex/row,column）设置文字；
itemText() - 获取指定的单元格（QModelIndex/row,column）的文字；
setItemData() - 为指定的单元格（QModelIndex/row,column）设置data（QVariant）；
itemData() - 获取指定的单元格（QModelIndex/row,column）的data（QVariant）；
setHignlightIndex() - 为指定的单元格设置背景色；
clear() - 清空model中的所有数据

以及信号：

itemChanged(const QModelIndex &index, const QVariant &value);

nari_tableitemmodel.h

#ifndef NARI_TABLEITEMMODEL_H
#define NARI_TABLEITEMMODEL_H

#include <QAbstractTableModel>
#include <QObject>
#include <QStringList>
#include <QVector>


class NARI_TableItemModel : public QAbstractTableModel
{
    Q_OBJECT
public:
    explicit NARI_TableItemModel(QObject *parent = NULL);
    ~NARI_TableItemModel();

    void SetData(const QVariantMap &map);
    void setHignlightIndex(QVector< QPair<int, int> > vec_index);

    virtual Qt::ItemFlags flags(const QModelIndex &index) const;
    virtual QVariant headerData(int section, Qt::Orientation orientation, int role) const;

    virtual int rowCount(const QModelIndex &parent) const;
    virtual int columnCount(const QModelIndex &parent) const;

    virtual QVariant data(const QModelIndex &index, int role) const;
    virtual bool setData(const QModelIndex &index, const QVariant &value, int role);

    QString itemText(int row, int column) const;
    QString itemText(const QModelIndex &index) const;
    void setItemText(const QModelIndex &index, const QString &str);
    void setItemText(int row, int column, const QString &str);

    QVariant ItemData(const QModelIndex &index) const;
    QVariant ItemData(int row, int column) const;
    void SetItemData(const QModelIndex &index, const QVariant &data);
    void SetItemData(int row, int column, const QVariant &data);

    void clear();

signals:
    void itemChanged(const QModelIndex &index, const QVariant &value);

private:
    QStringList m_hor_hedlbls;                      // headerlabels
    QStringList m_vec_hedlbls;                      // oids - map.keys()
    QVariantMap m_table_map, m_data_map;
    QVector<QPair<int, int> > m_highlight_indexs;   // 背景高亮的indexs
};

#endif // NARI_TABLEITEMMODEL_H

nari_tableitemmodel.cpp

#include "nari_tableitemmodel.h"

#include <QDebug>
#include <QColor>
#include <QIcon>


NARI_TableItemModel::NARI_TableItemModel(QObject *parent)
    : QAbstractTableModel(parent)
{
}

NARI_TableItemModel::~NARI_TableItemModel()
{
}

void NARI_TableItemModel::SetData(const QVariantMap &map)
{
    beginResetModel();
    m_hor_hedlbls = map["headerlabel"].toStringList();
    m_table_map = map;
    m_vec_hedlbls = map.keys();
    endResetModel();
}

void NARI_TableItemModel::setHignlightIndex(QVector<QPair<int, int> > vec_index)
{
    beginResetModel();
    m_highlight_indexs = vec_index;
    endResetModel();
}

Qt::ItemFlags NARI_TableItemModel::flags(const QModelIndex &index) const
{
     Qt::ItemFlags flags = QAbstractItemModel::flags(index);
     flags |= Qt::ItemIsEditable;
     return flags;
}

QVariant NARI_TableItemModel::data(const QModelIndex &_index, int role) const
{
    if(role == Qt::DisplayRole || role == Qt::EditRole)
    {
        QVariantMap *_map = (QVariantMap*)(m_table_map[m_vec_hedlbls[_index.row()]].data());
        return (*_map)[m_hor_hedlbls[_index.column()]];
    }
    else if(role == Qt::TextAlignmentRole)  return Qt::AlignCenter; // 文字居中
    else if(role == Qt::BackgroundColorRole)                        // 设置背景色
    {
        if(m_highlight_indexs.contains(qMakePair<int, int>(_index.row(), _index.column())))
            return QColor(230, 247, 255);
    }
//    else if(role == Qt::DecorationRole)     // 为item添加图标
//    {
//        return QIcon(":/images/device.svg");
//    }

    return QVariant();
}

QVariant NARI_TableItemModel::headerData(int section, Qt::Orientation orientation, int role) const
{
    if (orientation == Qt::Horizontal)
    {
        if (role == Qt::DisplayRole)    return m_hor_hedlbls.at(section);
        else    return QVariant();
    }

    return QAbstractTableModel::headerData(section, orientation, role); // 垂直表头的序号
}

bool NARI_TableItemModel::setData(const QModelIndex &_index, const QVariant &value, int role)
{
    if (_index.isValid() && role == Qt::EditRole)
    {
        QVariantMap *_map = (QVariantMap*)(m_table_map[m_vec_hedlbls[_index.row()]].data());
        if((*_map)[m_hor_hedlbls[_index.column()]] != value)
        {
            (*_map)[m_hor_hedlbls[_index.column()]] = value;
            emit dataChanged(_index, _index);
            emit itemChanged(_index, value);

            return true;
        }
    }
    return false;
}

int NARI_TableItemModel::rowCount(const QModelIndex &parent) const
{
    if (parent.isValid())   return 0;
    else    return m_table_map.size() - 2;
}

int NARI_TableItemModel::columnCount(const QModelIndex &parent) const
{
    if (parent.isValid())   return 0;
    else    return m_hor_hedlbls.size();
}

QString NARI_TableItemModel::itemText(int row, int column) const
{
    QVariantMap *_map = (QVariantMap*)(m_table_map[m_vec_hedlbls[row]].data());
    return (*_map)[m_hor_hedlbls[column]].toString();
}

QString NARI_TableItemModel::itemText(const QModelIndex &index) const
{
    QVariantMap *_map = (QVariantMap*)(m_table_map[m_vec_hedlbls[index.row()]].data());
    return (*_map)[m_hor_hedlbls[index.column()]].toString();
}

void NARI_TableItemModel::setItemText(const QModelIndex &index, const QString &str)
{
    QVariantMap *_map = (QVariantMap*)(m_table_map[m_vec_hedlbls[index.row()]].data());
    (*_map)[m_hor_hedlbls[index.column()]] = str;
}

void NARI_TableItemModel::setItemText(int row, int column, const QString &str)
{
    QVariantMap *_map = (QVariantMap*)(m_table_map[m_vec_hedlbls[row]].data());
    (*_map)[m_hor_hedlbls[column]] = str;
}

QVariant NARI_TableItemModel::ItemData(const QModelIndex &index) const
{
    QVariantMap *_map = (QVariantMap*)(m_data_map[m_vec_hedlbls[index.row()]].data());
    return (*_map)[m_hor_hedlbls[index.column()]];
}

QVariant NARI_TableItemModel::ItemData(int row, int column) const
{
    QVariantMap *_map = (QVariantMap*)(m_data_map[m_vec_hedlbls[row]].data());
    return (*_map)[m_hor_hedlbls[column]];
}

void NARI_TableItemModel::SetItemData(const QModelIndex &index, const QVariant &data)
{
    QString vec_lbl = m_vec_hedlbls[index.row()];
    if(!m_data_map.contains(vec_lbl))   m_data_map[vec_lbl] = QVariantMap();

    QVariantMap *_map = (QVariantMap*)(m_data_map[vec_lbl].data());
    (*_map)[m_hor_hedlbls[index.column()]] = data;
}

void NARI_TableItemModel::SetItemData(int row, int column, const QVariant &data)
{
    QString vec_lbl = m_vec_hedlbls[row];
    if(!m_data_map.contains(vec_lbl))   m_data_map[vec_lbl] = QVariantMap();

    QVariantMap *_map = (QVariantMap*)(m_data_map[vec_lbl].data());
    (*_map)[m_hor_hedlbls[column]] = data;
}

void NARI_TableItemModel::clear()
{
    beginResetModel();
    m_table_map.clear();
    m_data_map.clear();
    m_hor_hedlbls.clear();
    m_vec_hedlbls.clear();
    m_highlight_indexs.clear();
    endResetModel();
}

mainwindow.cpp

// 填充数据
QVariantMap data_map;
data_map["headerlabel"] = QStringList() << "ID" << tr("jiange") << tr("device") << tr("device type") << tr("factory name") << tr("voltage type") << tr("wf identifier") << tr("wf tuichu");
data_map["headerenum"] = QVariantList() << 1 << 2 << 3 << 4 << 5 << 6 << 7 << 8;

for(int i = 0; i < 100000; i++)
{
QVariantMap map_1;
map_1["ID"] = i + 1;
map_1["jiange"] = i + 2;
map_1["device"] = i + 3;
map_1["device type"] = i + 4;
map_1["factory name"] = i + 5;
map_1["voltage type"] = i + 6;
map_1["wf identifier"] = i + 7;
map_1["wf tuichu"] = i + 8;
data_map[QString::number(i) + "id"] = map_1;
}
table_model->SetData(data_map);    


// 测试setHignlightIndex
void MainWindow::on_btn_hignlight_clicked()
{
    QVector< QPair<int, int> > indexs;
    for(int i = 0; i < 2000; i++)
    {
        indexs.append(qMakePair<int ,int>(i, 2));
    }
    table_model->setHignlightIndex(indexs);
}

// 测试setItemText,SetItemData()
void MainWindow::on_btn_setItemText_clicked()
{
    table_model->setItemText(1, 1, "test");
    table_model->SetItemData(1, 1, "aoligei");
}

效果演示如下：