QTablewidget通过代理实现限制输入

QTablewidget代理

之前做过一个QTablewidget想要限制某些单元格只能输入IP，刚开始采用在单元格中添加QLineEdit控件的方法，效果差强人意。后来发现通过QItemDelegate可以很方便实现需求。

QItemDelegate 

#pragma once
#include <QWidget>
#include <QItemDelegate>  
#include <QLineEdit>
class CIPItem : public 
 6 {
    Q_OBJECT  
public:
    CIPItem(QObject *parent = 0);
    ~CIPItem(void);
public:
    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 ;
};

#include "IPItem.h"

CIPItem::CIPItem(QObject *parent):QItemDelegate(parent)
{
    
}

CIPItem::~CIPItem(void)
{
}
QWidget *CIPItem::createEditor ( QWidget * parent, const QStyleOptionViewItem & option, const QModelIndex & index ) const
{
    //添加代理控件
    QLineEdit *editor =  new  QLineEdit(parent); 
    QRegExp regExp("\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b");  //IP的正则表达式 
    editor->setValidator( new QRegExpValidator(regExp, parent));  
    return  editor;  
}

void CIPItem::setEditorData(QWidget *editor, const QModelIndex &index) const
{
    //将单元格中的文本写入代理控件
    QString text = index.model()->data(index, Qt::EditRole).toString();  
    QLineEdit *lineEdit =  static_cast <QLineEdit*>(editor);  
    lineEdit->setText(text); 
}

void CIPItem::setModelData ( QWidget * editor, QAbstractItemModel * model, const QModelIndex & index ) const 
{
    //将代理控件的文本写入单元格
    QLineEdit *lineEdit =  static_cast <QLineEdit*>(editor);  
    QString text = lineEdit->text();  
    model->setData(index, text, Qt::EditRole); 
}

在QTablewidget中调用setItemDelegate、setItemDelegateForColumn、setItemDelegateForRow即可。