Qt MVC 代理部分实现

Qt MVC 代理部分实现

第一部分：文字编辑lineEdit

直接堆代码
头文件inputDelegate.h

class InputDelegate: public QItemDelegate
{
    Q_OBJECT
public:
    explicit InputDelegate(QObject *parent = nullptr);
	//第1步：创建一个widget作为编辑器
    QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option,const QModelIndex &index) const;
    //第2步：初始化显示数据
    void setEditorData(QWidget *editor, const QModelIndex &index) const ;
    //第3步：用户完成编辑、编辑器被关闭时，提供数据到model
    void setModelData(QWidget *editor, QAbstractItemModel *model,const QModelIndex &index) const ;
    //第4步：调用编辑器的显示位置       
    void updateEditorGeometry(QWidget *editor,const QStyleOptionViewItem &option, const QModelIndex &index) const;

};

inputdelegate.cpp实现

InputDelegate::InputDelegate(QObject *parent) : QItemDelegate(parent)
{

}

QWidget *InputDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &/*option*/, const QModelIndex &/*index*/) const
{
    QLineEdit *pEditor = new QLineEdit(parent);
    return pEditor;
}

void InputDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
{
    QString text = index.model()->data(index, Qt::DisplayRole).toString();
    QLineEdit *lineEdit = static_cast(editor);
    lineEdit->setText(text);
}

void InputDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const
{
    QLineEdit *lineEdit = static_cast(editor);
    QString text = lineEdit->text();
    model->setData(index, text, Qt::EditRole);
}

void InputDelegate::updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    editor->setGeometry(option.rect);
}