本篇内容主要讲解“QAbstractTableModel的使用方法”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“QAbstractTableModel的使用方法”吧!
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QAbstractTableModel 结合 QTableView 使用，是QTableView的呈现的数据存储。继承QAbstractTableModel 必须重载以下几个纯虚函数(这些函数来自 QAbstractTableModel 的父类 QAbstractItemModel) :
Q_INVOKABLE virtual int rowCount(const QModelIndex &parent = QModelIndex()) const;
Q_INVOKABLE virtual int columnCount(const QModelIndex &parent = QModelIndex()) const;
Q_INVOKABLE virtual QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
其中 data 函数用来填充QTableView 每一个单元格内容。其 role 虽为int类型，但实际的值为 Qt::ItemDataRole 枚举类型 ，如下图:
简单的例子:
// tablemodel.h
#include
#include
#include
#define OVERLOAD_QT_CLASS_FUNCTION_DEGIN
#define OVERLOAD_QT_CLASS_FUNCTION_END
class CTableModel : public QAbstractTableModel
{
Q_OBJECT
public:
/**
* @brief The TRowData struct 行数据
*/
struct TRowData
{
QString sItem1;
QString sItem2;
QString sItem3;
QString sItem4;
};
private:
/**
* @brief The THeaderData struct 表头数据
*/
struct THeaderData
{
Qt::Orientation eOrientation; ///< 水平方向或者竖直方向
QVariant oMetaData; ///< 原生数据
int iRole; ///< 表头数据
};
public:
explicit CTableModel(QObject *parent);
void SetHeader(const QStringList &_clstHeader);
void SetContentData(const QVector &_cvTableData);
OVERLOAD_QT_CLASS_FUNCTION_DEGIN
/**
* @brief setHeaderData 该函数为QAbstractItemModel的虚函数, 其内部功能未实现, 若想使用需要手动重载
* @param section
* @param orientation
* @param value
* @param role
* @return
*/
virtual bool setHeaderData(int section, Qt::Orientation orientation, const QVariant &value,int role = Qt::EditRole) override;
Q_INVOKABLE virtual int rowCount(const QModelIndex &parent = QModelIndex()) const override;
Q_INVOKABLE virtual int columnCount(const QModelIndex &parent = QModelIndex()) const override;
Q_INVOKABLE virtual QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
Q_INVOKABLE virtual QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const override;
OVERLOAD_QT_CLASS_FUNCTION_END
private:
QHash m_hashSection2HHeader; ///< 水平表头数据
QHash m_hashSection2VHeader; ///< 垂直表头数据
QVector m_vtRowData; ///< 数据表
int m_iColumnCount; ///< 表头字段
};
// tablemodel.cpp
#include "tablemodel.h"
CTableModel::CTableModel(QObject * parent) : QAbstractTableModel(parent)
{
}
void CTableModel::SetHeader(const QStringList &_clstHeader)
{
m_iColumnCount = _clstHeader.size();
for (int i = 0; i < _clstHeader.size(); i++)
{
QString sHeader = _clstHeader.at(i);
qDebug() << this->setHeaderData(i, Qt::Horizontal, sHeader, Qt::DisplayRole);
}
}
void CTableModel::SetContentData(const QVector &_cvTableData)
{
QAbstractItemModel::beginResetModel();
m_vtRowData = _cvTableData;
QAbstractItemModel::endResetModel();
}
bool CTableModel::setHeaderData(int section, Qt::Orientation orientation, const QVariant &value, int role)
{
if (section < m_iColumnCount)
{
THeaderData tData;
tData.eOrientation = Qt::Horizontal;
tData.iRole = Qt::DisplayRole;
tData.oMetaData = value;
m_hashSection2HHeader[section] = tData;
emit headerDataChanged(Qt::Horizontal, section, section);
return true;
}
else{
return false;
}
}
int CTableModel::rowCount(const QModelIndex &parent) const
{
return m_vtRowData.size();
}
int CTableModel::columnCount(const QModelIndex &parent) const
{
return m_iColumnCount;
}
QVariant CTableModel::data(const QModelIndex &index, int role) const
{
if (role == Qt::DisplayRole)
{
int iRow = index.row();
int iColumn = index.column();
if (iColumn < 4 && iRow < m_vtRowData.size())
{
switch (iColumn)
{
case 0:
return m_vtRowData[iRow].sItem1;
case 1:
return m_vtRowData[iRow].sItem2;
case 2:
return m_vtRowData[iRow].sItem3;
case 3:
return m_vtRowData[iRow].sItem4;
default:
return QVariant();
}
}
return QVariant();
}
else if(role == Qt::TextAlignmentRole)
{
return Qt::AlignCenter;
}
return QVariant();
}
QVariant CTableModel::headerData(int section, Qt::Orientation orientation, int role) const
{
if (section < m_iColumnCount)
{
switch (role){
case Qt::DisplayRole:
{
switch (orientation) {
case Qt::Horizontal:
{
if (m_hashSection2HHeader.contains(section))
{
return m_hashSection2HHeader[section].oMetaData;
}
else{
return QVariant();
}
}
case Qt::Vertical:
default:
return QVariant();
}
}
default:
return QVariant();
}
}
else{
return QVariant();
}
}调用 CTableModel:
m_pModel = new CTableModel(ui->tableView);
QStringList lstHeader = {"测试1", "测试1", "测试1", "测试1"};
m_pModel->SetHeader(lstHeader);
ui->tableView->setModel(m_pModel);
QVector vtModelData;
for (int i = 0; i < 10; i++)
{
CTableModel::TRowData tData;
tData.sItem1 = QString("数据%1_%2").arg(i).arg(1);
tData.sItem2 = QString("数据%1_%2").arg(i).arg(2);
tData.sItem3 = QString("数据%1_%2").arg(i).arg(3);
tData.sItem4 = QString("数据%1_%2").arg(i).arg(4);
vtModelData.push_back(tData);
}
m_pModel->SetContentData(vtModelData);到此，相信大家对“QAbstractTableModel的使用方法”有了更深的了解，不妨来实际操作一番吧！这里是创新互联网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！
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