我有以下类，它代表数据结构中的记录:
#ifndef UECONNECTEDCLIENTRECORD_H
#define UECONNECTEDCLIENTRECORD_H
#include <QtGlobal>
#include <QObject>
#include <QHostAddress>
#include <QString>
class UeConnectedClientRecord : public QObject
{
Q_OBJECT
private:
/**
* @brief m_ueClientName
*/
QString m_ueClientName;
/**
* @brief m_ueClientAddress
*/
QHostAddress m_ueClientAddress;
/**
* @brief m_ueClientPort
*/
QString m_ueClientPort;
public:
/**
* @brief UeConnectedClientRecord
* @param parent
*/
explicit UeConnectedClientRecord(const QString& clientName=QString(),
const QHostAddress& clientAddress=QHostAddress(),
const QString& clientPort=QString());
/**
* @brief ueSetClientName
* @param name
*/
inline void ueSetClientName(const QString& name)
{ this->m_ueClientName=name; }
/**
* @brief ueSetClientAddress
* @param address
*/
inline void ueSetClientAddress(const QHostAddress& address)
{ this->m_ueClientAddress=address; }
/**
* @brief ueSetClientPort
* @param port
*/
inline void ueSetClientPort(const QString& port)
{ this->m_ueClientPort=port; }
/**
* @brief ueClientName
* @return client name
*/
inline const QString& ueClientName() const
{ return this->m_ueClientName; }
/**
* @brief ueClientAddress
* @return client address
*/
inline const QHostAddress& ueClientAddress() const
{ return this->m_ueClientAddress; }
/**
* @brief ueClientPort
* @return client port
*/
inline const QString& ueClientPort() const
{ return this->m_ueClientPort; }
};
#endif // UECONNECTEDCLIENTRECORD_H
用于子类 QAbstractTableModel :
#ifndef UECONNECTEDCLIENTSTABLEMODEL_H
#define UECONNECTEDCLIENTSTABLEMODEL_H
#include <QObject>
#include <QAbstractTableModel>
#include <QList>
#include <QModelIndex>
#include <QVariant>
#include <QHash>
#include <QByteArray>
#include "ueconnectedclientrecord.h"
class UeConnectedClientsTableModel : public QAbstractTableModel
{
Q_OBJECT
private:
/**
* @brief m_ueConnectedClientData
*/
QList<UeConnectedClientRecord*> m_ueConnectedClientData;
protected:
/**
* @brief ueSetConnectedClientData
* @param clientData
*/
inline void ueSetConnectedClientData(const QList<UeConnectedClientRecord*>& clientData)
{ this->m_ueConnectedClientData=clientData; }
public:
/**
* @brief UeConnectedClientsTableModel
* @param parent
*/
UeConnectedClientsTableModel(QObject* parent=Q_NULLPTR);
/**
* @brief ueConnectedClientData
* @return connected client data
*/
inline const QList<UeConnectedClientRecord*>& ueConnectedClientData() const
{ return this->m_ueConnectedClientData; }
/**
* @brief rowCount
* @param parent
* @return number of rows in model
*/
inline int rowCount(const QModelIndex& /*parent*/) const
{ return this->ueConnectedClientData().size(); }
/**
* @brief columnCount
* @return number of columns in model
*/
inline int columnCount(const QModelIndex& /*parent*/) const
{ return 3; }
/**
* @brief data
* @param index
* @param role
* @return data for index
*/
QVariant data(const QModelIndex& index,
int role=Qt::DisplayRole) const;
/**
* @brief roleNames
* @return role names
*/
QHash<int, QByteArray> roleNames() const;
/**
* @brief headerData
* @param section
* @param orientation
* @param role
* @return header data
*/
QVariant headerData(int section,
Qt::Orientation orientation,
int role=Qt::DisplayRole) const;
/**
* @brief insertRows
* @param row
* @param count
* @param parent
* @return true if the rows were successfully inserted; otherwise returns false
*/
bool insertRows(int row,
int count,
const QModelIndex& parent=QModelIndex());
/**
* @brief removeRows
* @param row
* @param count
* @param parent
* @return true if the rows were successfully removed; otherwise returns false
*/
bool removeRows(int row,
int count,
const QModelIndex& parent=QModelIndex());
public:
/**
* @brief ueRoleClientName
*/
static const int ueRoleClientName=Qt::UserRole+1;
/**
* @brief ueRoleClientAddress
*/
static const int ueRoleClientAddress=Qt::UserRole+2;
/**
* @brief ueRoleCllientPort
*/
static const int ueRoleCllientPort=Qt::UserRole+3;
};
#endif // UECONNECTEDCLIENTSTABLEMODEL_H
及其实现:
#include "ueconnectedclientstablemodel.h"
UeConnectedClientsTableModel::UeConnectedClientsTableModel(QObject* parent)
: QAbstractTableModel(parent)
{
} // constructor
QVariant UeConnectedClientsTableModel::data(const QModelIndex& index,
int role) const
{
switch(role)
{
case ueRoleClientName:
{
return this->ueConnectedClientData().at(index.row())->ueClientName();
} // case
case ueRoleClientAddress:
{
return this->ueConnectedClientData().at(index.row())->ueClientAddress().toString();
} // case
case ueRoleCllientPort:
{
return this->ueConnectedClientData().at(index.row())->ueClientPort().toInt();
} // case
default:
{
return UeConnectedClientsTableModel::data(index,
role);
} // default
} // switch
} // data
QHash<int, QByteArray> UeConnectedClientsTableModel::roleNames() const
{
QHash<int, QByteArray> roles;
const int roleClientName=UeConnectedClientsTableModel::ueRoleClientName;
const int roleClientAddress=UeConnectedClientsTableModel::ueRoleClientAddress;
const int roleCllientPort=UeConnectedClientsTableModel::ueRoleCllientPort;
roles.insert(roleClientName,
"roleClientName");
roles.insert(roleClientAddress,
"roleClientAddress");
roles.insert(roleCllientPort,
"roleCllientPort");
return roles;
} // roleNames
QVariant UeConnectedClientsTableModel::headerData(int section,
Qt::Orientation orientation,
int role) const
{
Q_UNUSED(orientation)
if(role!=Qt::DisplayRole)
return QVariant();
switch(section)
{
case 0:
{
return tr("Client name");
} // case
case 1:
{
return tr("Client address");
} // case
case 2:
{
return tr("Client port");
} // case
default:
{
return QVariant();
} // default
} // switch
} // headerData
bool UeConnectedClientsTableModel::insertRows(int row,
int count,
const QModelIndex& parent)
{
this->beginInsertRows(parent,
row,
row+count);
for(int index=row; index<row+count; index++)
{
m_ueConnectedClientData.append(new UeConnectedClientRecord());
} // for
this->endInsertRows();
return true;
} // insertRows
bool UeConnectedClientsTableModel::removeRows(int row,
int count,
const QModelIndex& parent)
{
this->beginRemoveRows(parent,
row,
row+count);
for(int index=row; index<row+count; index++)
{
m_ueConnectedClientData.removeLast();
} // for
this->endRemoveRows();
return true;
} // removeRows
现在，我如何从代码中调用
insertRows() 以将带有真实数据(不是 UeConnectedClientRecord - 默认构造函数)的新 new UeConnectedClientRecord() 插入到内部 QList 中？我问的是因为我已经在互联网上搜索过示例并找到了 Qt Address Book Example ，但是， insertRows() from official docs 和 insertRows() from Address Book Example 的声明方式不同:bool QAbstractItemModel::insertRows(int row, int count, const QModelIndex &parent = QModelIndex()); 来自 docs bool insertRows(int position, int rows, const QModelIndex &index = QModelIndex()) Q_DECL_OVERRIDE; 来自 Address Book Example 为什么？
最佳答案
从文档:
方式 1. 使用 insertRows + setData 。 Qt 假设空记录是可能的，并且添加行不是添加数据。由于您的内部列表是指针的 Qlist，您可以在那里插入 nullptr 以防止默认构造函数调用。在这种情况下，您需要对每个 data 调用进行项目检查:如果项目是 nullptr ，则应返回默认值。
方式2.您可以实现自己的插入功能。据我所知，insertRows 函数不被 View 使用，通常是手动调用的。但“通常”并非“总是”。例如，代理模型可以使用它。
关于c++ - QAbstractTableModel::insertRows 将新数据附加到内部 QList，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/38652031/