Delegate 部分

关键是重写这四个函数：

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QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex	&index) const;
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void setEditorData(QWidget *editor, const QModelIndex &index) const;
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void setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const;
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void updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const  QModelIndex &index) const;

头文件

combodelegate.h

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class ComboDelegate:public QItemDelegate
{
    Q_OBJECT
public:
    ComboDelegate(QObject *parent=0);

    QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex	&index) const;

    void setEditorData(QWidget *editor, const QModelIndex &index) const;

    void setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const;

    void updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const  QModelIndex &index) const;
};

源文件

combodelegate.cpp

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QWidget *ComboDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    QComboBox *editor=new QComboBox(parent);
    editor->addItem("程序员");
    editor->addItem("网管");
    editor->addItem("修电脑的");
    editor->addItem("送水的");
    editor->installEventFilter(const_cast<ComboDelegate*>(this));
    return editor;
}
 
void ComboDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
{
    QString str=index.model()->data(index).toString();
    QComboBox *box=static_cast<QComboBox*>(editor);
    int i=box->findText(str);
    box->setCurrentIndex(i);
}
 
void ComboDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const
{
    QComboBox *box=static_cast<QComboBox*>(editor);
    QString str=box->currentText();
    model->setData(index,str);
}
 
void ComboDelegate::updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    editor->setGeometry(option.rect);
}

Model 部分

重写 flag() 函数 和 setData() 函数

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Qt::ItemFlags flags(const QModelIndex &index) const
{
    Qt::ItemFlags flags = QAbstractItemModel::flags(index);
    flags |= Qt::ItemIsEditable; // 允许编辑
    return flags;
}
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bool setData(const QModelIndex &index, const QVariant &value, int role)
{
    if (!index.isValid()) return false;
    if (role == Qt::EditRole) // 可以手动设置 role
    {
        ; // 通过 index 来设置 value
    }
    return true;
}

View 部分

手动实现重命名

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void NovelDirListView::slotRenameChapter()
{
    edit(currentIndex()); // 手动重命名函数
}