Qt實現(xiàn)自定義模型基于QAbstractTableModel

兩個例子

例子1代碼

Main.cpp

#include <QtGui>#include "currencymodel.h"int main(int argc, char *argv[]) {QApplication app(argc, argv);//數(shù)據(jù)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);//自定義表模型 CurrencyModel currencyModel;currencyModel.setCurrencyMap(currencyMap);//表視圖 QTableView tableView;//設(shè)置視圖模型tableView.setModel(&currencyModel);//設(shè)置交替顏色tableView.setAlternatingRowColors(true);tableView.setWindowTitle(QObject::tr("Currencies"));tableView.show();return app.exec(); }

currencymodel.h

#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

currencymodel.cpp

#include <QtCore>#include "currencymodel.h"CurrencyModel::CurrencyModel(QObject *parent): QAbstractTableModel(parent) { }void CurrencyModel::setCurrencyMap(const QMap<QString, double> &map) {currencyMap = map;//重置模型至原始狀態(tài)，告訴所有視圖，他們數(shù)據(jù)都無效，強(qiáng)制刷新數(shù)據(jù) reset(); }//返回行數(shù) int CurrencyModel::rowCount(const QModelIndex & /* parent */) const {return currencyMap.count(); } //返回列數(shù) int CurrencyModel::columnCount(const QModelIndex & /* parent */) const {return currencyMap.count(); }//返回一個項的任意角色的值，這個項被指定為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(); } //返回表頭名稱,(行號或列號，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); } //獲取當(dāng)前關(guān)鍵字 QString CurrencyModel::currencyAt(int offset) const {return (currencyMap.begin() + offset).key(); }

例子2代碼

Main.cpp

#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(); }

citymodel.h

#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

citymodel.cpp

#include <QtCore>#include "citymodel.h"CityModel::CityModel(QObject *parent): QAbstractTableModel(parent) { } //設(shè)定一下數(shù)據(jù)源 void CityModel::setCities(const QStringList &cityNames) {cities = cityNames;//重新設(shè)置一下QVector distances的矩陣大小的，中間對角線為0不用存distances.resize(cities.count() * (cities.count() - 1) / 2);//填充所有距離值為0distances.fill(0);//刷新所有視圖數(shù)據(jù) reset(); } //模型行數(shù) int CityModel::rowCount(const QModelIndex & /* parent */) const {return cities.count(); } //模型列數(shù) int CityModel::columnCount(const QModelIndex & /* parent */) const {return cities.count(); } //賦值模型每個項的數(shù)據(jù) 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(); } //編輯一個項 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();//交換對應(yīng)項的模型索引QModelIndex transposedIndex = createIndex(index.column(),index.row());//某項發(fā)生改變，發(fā)射信號( between topLeft and bottomRight inclusive) emit dataChanged(index, index);emit dataChanged(transposedIndex, transposedIndex);return true;}return false; }//返回列表頭 QVariant CityModel::headerData(int section,Qt::Orientation /* orientation */,int role) const {//返回在Cities字符串列表中給定偏移量的城市名稱if (role == Qt::DisplayRole)return cities[section];return QVariant(); } //返回對一個項相關(guān)的操作的標(biāo)識符（例如，是否可以編輯或者是否已選中等） Qt::ItemFlags CityModel::flags(const QModelIndex &index) const {Qt::ItemFlags flags = QAbstractItemModel::flags(index);if (index.row() != index.column())flags |= Qt::ItemIsEditable;return flags; } //計算偏移量 int CityModel::offsetOf(int row, int column) const {if (row < column)qSwap(row, column);return (row * (row - 1) / 2) + column; }

轉(zhuǎn)自：http://qimo601.iteye.com/blog/1534331

轉(zhuǎn)載于:https://www.cnblogs.com/liushui-sky/p/5775579.html

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