#include <QtGui>#include "currencymodel.h"int main(int argc, char *argv[])
{QApplication app(argc, argv);//数据源QMap<QString, double> currencyMap;currencyMap.insert("AUD", 1.3259);currencyMap.insert("CHF", 1.2970);currencyMap.insert("CZK", 24.510);currencyMap.insert("DKK", 6.2168);currencyMap.insert("EUR", 0.8333);currencyMap.insert("GBP", 0.5661);currencyMap.insert("HKD", 7.7562);currencyMap.insert("JPY", 112.92);currencyMap.insert("NOK", 6.5200);currencyMap.insert("NZD", 1.4697);currencyMap.insert("SEK", 7.8180);currencyMap.insert("SGD", 1.6901);currencyMap.insert("USD", 1.0000);//自定义表模型
    CurrencyModel currencyModel;currencyModel.setCurrencyMap(currencyMap);//表视图
    QTableView tableView;//设置视图模型tableView.setModel(&currencyModel);//设置交替颜色tableView.setAlternatingRowColors(true);tableView.setWindowTitle(QObject::tr("Currencies"));tableView.show();return app.exec();
}

#ifndef CURRENCYMODEL_H
#define CURRENCYMODEL_H#include <QAbstractTableModel>
#include <QMap>class CurrencyModel : public QAbstractTableModel
{
public:CurrencyModel(QObject *parent = 0);void setCurrencyMap(const QMap<QString, double> &map);int rowCount(const QModelIndex &parent) const;int columnCount(const QModelIndex &parent) const;QVariant data(const QModelIndex &index, int role) const;QVariant headerData(int section, Qt::Orientation orientation,int role) const;private:QString currencyAt(int offset) const;QMap<QString, double> currencyMap;
};#endif

#include <QtCore>#include "currencymodel.h"CurrencyModel::CurrencyModel(QObject *parent): QAbstractTableModel(parent)
{
}void CurrencyModel::setCurrencyMap(const QMap<QString, double> &map)
{currencyMap = map;//重置模型至原始状态，告诉所有视图，他们数据都无效，强制刷新数据
    reset();
}//返回行数
int CurrencyModel::rowCount(const QModelIndex & /* parent */) const
{return currencyMap.count();
}
//返回列数
int CurrencyModel::columnCount(const QModelIndex & /* parent */) const
{return currencyMap.count();
}//返回一个项的任意角色的值，这个项被指定为QModelIndex
QVariant CurrencyModel::data(const QModelIndex &index, int role) const
{if (!index.isValid())return QVariant();if (role == Qt::TextAlignmentRole) {return int(Qt::AlignRight | Qt::AlignVCenter);} else if (role == Qt::DisplayRole) {QString rowCurrency = currencyAt(index.row());QString columnCurrency = currencyAt(index.column());if (currencyMap.value(rowCurrency) == 0.0)return "####";double amount = currencyMap.value(columnCurrency)/ currencyMap.value(rowCurrency);return QString("%1").arg(amount, 0, 'f', 4);}return QVariant();
}
//返回表头名称,(行号或列号，水平或垂直，角色)
QVariant CurrencyModel::headerData(int section,Qt::Orientation /* orientation */,int role) const
{if (role != Qt::DisplayRole)return QVariant();return currencyAt(section);
}
//获取当前关键字
QString CurrencyModel::currencyAt(int offset) const
{return (currencyMap.begin() + offset).key();
}

#include <QApplication>
#include <QHeaderView>
#include <QTableView>#include "citymodel.h"int main(int argc, char *argv[])
{QApplication app(argc, argv);//保存城市名
    QStringList cities;cities << "Arvika" << "Boden" << "Eskilstuna" << "Falun"<< "Filipstad" << "Halmstad" << "Helsingborg" << "Karlstad"<< "Kiruna" << "Kramfors" << "Motala" << "Sandviken"<< "Skara" << "Stockholm" << "Sundsvall" << "Trelleborg";//模型
    CityModel cityModel;//
    cityModel.setCities(cities);QTableView tableView;tableView.setModel(&cityModel);tableView.setAlternatingRowColors(true);tableView.setWindowTitle(QObject::tr("Cities"));tableView.show();return app.exec();
}

#ifndef CITYMODEL_H
#define CITYMODEL_H#include <QAbstractTableModel>
#include <QStringList>
#include <QVector>class CityModel : public QAbstractTableModel
{Q_OBJECTpublic:CityModel(QObject *parent = 0);void setCities(const QStringList &cityNames);int rowCount(const QModelIndex &parent) const;int columnCount(const QModelIndex &parent) const;QVariant data(const QModelIndex &index, int role) const;bool setData(const QModelIndex &index, const QVariant &value,int role);QVariant headerData(int section, Qt::Orientation orientation,int role) const;Qt::ItemFlags flags(const QModelIndex &index) const;private:int offsetOf(int row, int column) const;QStringList cities;QVector<int> distances;
};#endif

#include <QtCore>#include "citymodel.h"CityModel::CityModel(QObject *parent): QAbstractTableModel(parent)
{
}
//设定一下数据源
void CityModel::setCities(const QStringList &cityNames)
{cities = cityNames;//重新设置一下QVector distances的矩阵大小的，中间对角线为0不用存distances.resize(cities.count() * (cities.count() - 1) / 2);//填充所有距离值为0distances.fill(0);//刷新所有视图数据
    reset();
}
//模型行数
int CityModel::rowCount(const QModelIndex & /* parent */) const
{return cities.count();
}
//模型列数
int CityModel::columnCount(const QModelIndex & /* parent */) const
{return cities.count();
}
//赋值模型每个项的数据
QVariant CityModel::data(const QModelIndex &index, int role) const
{if (!index.isValid())return QVariant();if (role == Qt::TextAlignmentRole) {return int(Qt::AlignRight | Qt::AlignVCenter);} else if (role == Qt::DisplayRole) {if (index.row() == index.column())return 0;int offset = offsetOf(index.row(), index.column());return distances[offset];}return QVariant();
}
//编辑一个项
bool CityModel::setData(const QModelIndex &index,const QVariant &value, int role)
{if (index.isValid() && index.row() != index.column()&& role == Qt::EditRole) {int offset = offsetOf(index.row(), index.column());distances[offset] = value.toInt();//交换对应项的模型索引QModelIndex transposedIndex = createIndex(index.column(),index.row());//某项发生改变，发射信号( between topLeft and bottomRight inclusive)
        emit dataChanged(index, index);emit dataChanged(transposedIndex, transposedIndex);return true;}return false;
}//返回列表头
QVariant CityModel::headerData(int section,Qt::Orientation /* orientation */,int role) const
{//返回在Cities字符串列表中给定偏移量的城市名称if (role == Qt::DisplayRole)return cities[section];return QVariant();
}
//返回对一个项相关的操作的标识符（例如，是否可以编辑或者是否已选中等）
Qt::ItemFlags CityModel::flags(const QModelIndex &index) const
{Qt::ItemFlags flags = QAbstractItemModel::flags(index);if (index.row() != index.column())flags |= Qt::ItemIsEditable;return flags;
}
//计算偏移量
int CityModel::offsetOf(int row, int column) const
{if (row < column)qSwap(row, column);return (row * (row - 1) / 2) + column;
}