c – 将QAbstractTableModel与Qml TableView一起使用仅显示第1列

但是,只显示第一列.

原因是QVariant MyModel :: data(const QModelIndex& index,int role)不是为非零列调用的,但我不明白为什么.

QTableView工作正常.

我制作了一个单独的,简单的项目来重现我的问题：

MyModel.h：

#ifndef MYMODEL_H
#define MYMODEL_H

#include <QObject>
#include <QAbstractTableModel>
#include <QList>
#include <QString>
#include <QDebug>

struct SimpleData
{
    QString m_one;
    qint32 m_two;
    qreal m_three;
};

class MyModel : public QAbstractTableModel
{
    Q_OBJECT
public:
    explicit MyModel();//MyData *the_data);
    int rowCount(const QModelIndex & parent = QModelIndex()) const Q_DECL_OVERRIDE;
    int columnCount(const QModelIndex &parent = QModelIndex()) const Q_DECL_OVERRIDE;
    QVariant data(const QModelIndex &index,int role = Qt::DisplayRole) const Q_DECL_OVERRIDE;

    QHash<int,QByteArray> roleNames() const Q_DECL_OVERRIDE;
signals:

public slots:
    void theDataChanged();

private:
   QList<SimpleData> m_the_data;

};

#endif // MYMODEL_H

mymodel.cpp：
#include“mymodel.h”

MyModel::MyModel() : QAbstractTableModel(0)
{
    m_the_data << SimpleData{"Alpha",10,100.0}
               << SimpleData{"Beta",20,200.0}
               << SimpleData{"Gamma",30,300.0}
               << SimpleData{"Delta",40,400.0};
}

int MyModel::rowCount(const QModelIndex &parent) const
{
    Q_UNUSED(parent)
    return m_the_data.size();
}

int MyModel::columnCount(const QModelIndex &parent) const
{
    Q_UNUSED(parent)
    return 3;
}

QVariant MyModel::data(const QModelIndex &index,int role) const
{
    // Check DisplayRole
    if(role != Qt::DisplayRole)
    {
        return QVariant();
    }

    // Check boudaries
    if(index.column() < 0 ||
            columnCount() <= index.column() ||
            index.row() < 0 ||
            rowCount() <= index.row())
    {
        qDebug() << "Warning: " << index.row() << "," << index.column();
        return QVariant();
    }

    // Nominal case
     qDebug() << "MyModel::data: " << index.column() << "; " << index.row();
    switch(index.column())
    {
        case 0:
            return m_the_data[index.row()].m_one;
        case 1:
            return  m_the_data[index.row()].m_two;
        case 2:
            return  m_the_data[index.row()].m_three;
        default:
            qDebug() << "Not supposed to happen";
            return QVariant();
    }
}

QHash<int,QByteArray> MyModel::roleNames() const
{
    QHash<int,QByteArray> roles;
    roles[0] = "one";
    roles[1] = "two";
    roles[2] = "three";
    return roles;

}

void MyModel::theDataChanged()
{
    //TODO
}

main.qml：

import QtQuick 2.1
import QtQuick.Controls 1.0

ApplicationWindow {
    title: qsTr("Hello World")
    width: 640
    height: 480

    menuBar: MenuBar {
        Menu {
            title: qsTr("File")
            MenuItem {
                text: qsTr("Exit")
                onTriggered: Qt.quit();
            }
        }
    }
TableView {

    anchors.fill: parent

    TableViewColumn {title: "1"; role: "one"; width: 70 }
    TableViewColumn {title: "2"; role: "two"; width: 70   }
    TableViewColumn {title: "3"; role: "three"; width: 70 }

    model: theModel

}

}

main.cpp中：

#include <QtQml>
#include <QQmlApplicationEngine>
#include <QApplication>
#include <QQuickWindow>
#include <QTableView>

#include "mymodel.h"

int main(int argc,char *argv[])
{
    // Application :
    QApplication app(argc,argv);

    // Data stuff :
    //MyData data(&app);
    MyModel model;



 // UI :
    QQmlApplicationEngine engine;
    engine.rootContext()->setContextProperty("theModel",&model);

    engine.load(QUrl("qrc:/qml/main.qml"));
    QList<QObject*> temp = engine.rootObjects();
    QObject *topLevel = temp.value(0);
    QQuickWindow *window = qobject_cast<QQuickWindow *>(topLevel);
    if ( !window ) {
        qWarning("Error: Your root item has to be a Window.");
        return -1;


 }

    // Display the main.qml,which show the model:
    window->show();

    // Same,using a QTableView:
    QTableView view;;
    view.setModel(&model);
    view.show();

    return app.exec();
}

qDebug输出关于TableView(row,then column)：

MyModel::data:  0 ;  0 
MyModel::data:  0 ;  0 
MyModel::data:  0 ;  1 
MyModel::data:  0 ;  1 
MyModel::data:  0 ;  2 
MyModel::data:  0 ;  2 
MyModel::data:  0 ;  3 
MyModel::data:  0 ;  3

关于QTableVierw的qdebug输出：

MyModel::data:  0 ;  0 
MyModel::data:  0 ;  0 
MyModel::data:  0 ;  0 
MyModel::data:  1 ;  0 
MyModel::data:  2 ;  0 
MyModel::data:  0 ;  1 
MyModel::data:  1 ;  1 
MyModel::data:  2 ;  1 
MyModel::data:  0 ;  2 
MyModel::data:  1 ;  2 
MyModel::data:  2 ;  2 
MyModel::data:  0 ;  3 
MyModel::data:  1 ;  3 
MyModel::data:  2 ;  3

笔记/东西我试过：

>在我给的代码中,我可以使用一个QQmlListProperty;然而我的实际代码更复杂

>数据实际上是查询的,
>我没有SimpleData类
>我基本上使用QAbstractTableModel作为代理.
因此,我不能切换到一个QQmlListProperty(或等效的)

>有一个项目来检查模型,ModelTest,但它不适用于Qt 5.2.
>数据类型(QString,qreal)不是一个问题：交换仍然只显示第一列.

相关链接：

http://qt-project.org/doc/qt-5/QAbstractTableModel.html

http://qt-project.org/doc/qt-5/qtquick-modelviewsdata-cppmodels.html#qabstractitemmodel

提前致谢！

规格：Windows 7,Qt 5.2,Mingw 4.8,Qt Creator 3.0