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

 1 #pragma once
 2 #include <QWidget>
 3 #include <QItemDelegate>  
 4 #include <QLineEdit>
 5 class CIPItem : public 
 6 {
 7     Q_OBJECT  
 8 public:
 9     CIPItem(QObject *parent = 0);
10     ~CIPItem(void);
11 public:
12     QWidget *createEditor ( QWidget * parent, const QStyleOptionViewItem & option, const QModelIndex & index ) const;
13     void setEditorData ( QWidget * editor, const QModelIndex & index ) const ;
14     void setModelData ( QWidget * editor, QAbstractItemModel * model, const QModelIndex & index ) const ;
15 };

 1 #include "IPItem.h"
 2 
 3 CIPItem::CIPItem(QObject *parent):QItemDelegate(parent)
 4 {
 5     
 6 }
 7 
 8 CIPItem::~CIPItem(void)
 9 {
10 }
11 QWidget *CIPItem::createEditor ( QWidget * parent, const QStyleOptionViewItem & option, const QModelIndex & index ) const
12 {
13     //添加代理控件
14     QLineEdit *editor =  new  QLineEdit(parent); 
15     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 
16     editor->setValidator( new QRegExpValidator(regExp, parent));  
17     return  editor;  
18 }
19 
20 void CIPItem::setEditorData(QWidget *editor, const QModelIndex &index) const
21 {
22     //将单元格中的文本写入代理控件
23     QString text = index.model()->data(index, Qt::EditRole).toString();  
24     QLineEdit *lineEdit =  static_cast <QLineEdit*>(editor);  
25     lineEdit->setText(text); 
26 }
27 
28 void CIPItem::setModelData ( QWidget * editor, QAbstractItemModel * model, const QModelIndex & index ) const 
29 {
30     //将代理控件的文本写入单元格
31     QLineEdit *lineEdit =  static_cast <QLineEdit*>(editor);  
32     QString text = lineEdit->text();  
33     model->setData(index, text, Qt::EditRole); 
34 }

在QTablewidget中调用setItemDelegate、setItemDelegateForColumn、setItemDelegateForRow即可。