abstracttablemodel(QAbstractTableModel的使用方法)

QAbstractTableModel 結合 QTableView 使用,是QTableView的呈現的數據存儲。繼承QAbstractTableModel 必須重載以下幾個純虛函數(這些函數來自 QAbstractTableModel 的父類 QAbstractItemModel) :

Q_INVOKABLEvirtualintrowCount(constQModelIndex&parent=QModelIndex())const;Q_INVOKABLEvirtualintcolumnCount(constQModelIndex&parent=QModelIndex())const;Q_INVOKABLEvirtualQVariantdata(constQModelIndex&index,introle=Qt::DisplayRole)const;

其中 data 函數用來填充QTableView 每一個單元格內容。其 role 雖為int類型,但實際的值為 Qt::ItemDataRole 枚舉類型 ,如下圖:

簡單的例子:

//tablemodel.h#include<QAbstractTableModel>#include<QStringList>#include<QVariant>#defineOVERLOAD_QT_CLASS_FUNCTION_DEGIN#defineOVERLOAD_QT_CLASS_FUNCTION_ENDclassCTableModel:publicQAbstractTableModel{Q_OBJECTpublic:/***@briefTheTRowDatastruct行數據*/structTRowData{QStringsItem1;QStringsItem2;QStringsItem3;QStringsItem4;};private:/***@briefTheTHeaderDatastruct表頭數據*/structTHeaderData{Qt::OrientationeOrientation;///<水平方向或者豎直方向QVariantoMetaData;///<原生數據intiRole;///<表頭數據};public:explicitCTableModel(QObject*parent);voidSetHeader(constQStringList&_clstHeader);voidSetContentData(constQVector<TRowData>&_cvTableData);OVERLOAD_QT_CLASS_FUNCTION_DEGIN/***@briefsetHeaderData該函數為QAbstractItemModel的虛函數,其內部功能未實現,若想使用需要手動重載*@paramsection*@paramorientation*@paramvalue*@paramrole*@return*/virtualboolsetHeaderData(intsection,Qt::Orientationorientation,constQVariant&value,introle=Qt::EditRole)override;Q_INVOKABLEvirtualintrowCount(constQModelIndex&parent=QModelIndex())constoverride;Q_INVOKABLEvirtualintcolumnCount(constQModelIndex&parent=QModelIndex())constoverride;Q_INVOKABLEvirtualQVariantdata(constQModelIndex&index,introle=Qt::DisplayRole)constoverride;Q_INVOKABLEvirtualQVariantheaderData(intsection,Qt::Orientationorientation,introle=Qt::DisplayRole)constoverride;OVERLOAD_QT_CLASS_FUNCTION_ENDprivate:QHash<int,THeaderData>m_hashSection2HHeader;///<水平表頭數據QHash<int,THeaderData>m_hashSection2VHeader;///<垂直表頭數據QVector<TRowData>m_vtRowData;///<數據表intm_iColumnCount;///<表頭字段};

//tablemodel.cpp#include"tablemodel.h"CTableModel::CTableModel(QObject*parent):QAbstractTableModel(parent){}voidCTableModel::SetHeader(constQStringList&_clstHeader){m_iColumnCount=_clstHeader.size();for(inti=0;i<_clstHeader.size();i++){QStringsHeader=_clstHeader.at(i);qDebug()<<this->setHeaderData(i,Qt::Horizontal,sHeader,Qt::DisplayRole);}}voidCTableModel::SetContentData(constQVector<CTableModel::TRowData>&_cvTableData){QAbstractItemModel::beginResetModel();m_vtRowData=_cvTableData;QAbstractItemModel::endResetModel();}boolCTableModel::setHeaderData(intsection,Qt::Orientationorientation,constQVariant&value,introle){if(section<m_iColumnCount){THeaderDatatData;tData.eOrientation=Qt::Horizontal;tData.iRole=Qt::DisplayRole;tData.oMetaData=value;m_hashSection2HHeader[section]=tData;emitheaderDataChanged(Qt::Horizontal,section,section);returntrue;}else{returnfalse;}}intCTableModel::rowCount(constQModelIndex&parent)const{returnm_vtRowData.size();}intCTableModel::columnCount(constQModelIndex&parent)const{returnm_iColumnCount;}QVariantCTableModel::data(constQModelIndex&index,introle)const{if(role==Qt::DisplayRole){intiRow=index.row();intiColumn=index.column();if(iColumn<4&&iRow<m_vtRowData.size()){switch(iColumn){case0:returnm_vtRowData[iRow].sItem1;case1:returnm_vtRowData[iRow].sItem2;case2:returnm_vtRowData[iRow].sItem3;case3:returnm_vtRowData[iRow].sItem4;default:returnQVariant();}}returnQVariant();}elseif(role==Qt::TextAlignmentRole){returnQt::AlignCenter;}returnQVariant();}QVariantCTableModel::headerData(intsection,Qt::Orientationorientation,introle)const{if(section<m_iColumnCount){switch(role){caseQt::DisplayRole:{switch(orientation){caseQt::Horizontal:{if(m_hashSection2HHeader.contains(section)){returnm_hashSection2HHeader[section].oMetaData;}else{returnQVariant();}}caseQt::Vertical:default:returnQVariant();}}default:returnQVariant();}}else{returnQVariant();}}

調用 CTableModel:

m_pModel=newCTableModel(ui->tableView);QStringListlstHeader={"測試1","測試1","測試1","測試1"};m_pModel->SetHeader(lstHeader);ui->tableView->setModel(m_pModel);QVector<CTableModel::TRowData>vtModelData;for(inti=0;i<10;i++){CTableModel::TRowDatatData;tData.sItem1=QString("數據%1_%2").arg(i).arg(1);tData.sItem2=QString("數據%1_%2").arg(i).arg(2);tData.sItem3=QString("數據%1_%2").arg(i).arg(3);tData.sItem4=QString("數據%1_%2").arg(i).arg(4);vtModelData.push_back(tData);}m_pModel->SetContentData(vtModelData);

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