source link:http://www.cppblog.com/cctoqh/archive/2011/06/03/148018.html
1.通过自定义类方式实现IP4地址范围限制输入：
//--------------------TLineEditIP.h--------------------
#ifndef TLINEEDITIP_H
#define TLINEEDITIP_H
#include <QLineEdit>
#include <QEvent>
class TLineEditIP : public QLineEdit
{
Q_OBJECT
#define QTUTL_IP_SIZE 4
signals :
void signalTextChanged(QLineEdit* pEdit);
public:
TLineEditIP(QWidget *parent = 0);
~TLineEditIP();
void setText(const QString &strIP);
QString text() const;
public slots:
void slotTextChanged(QLineEdit* pEdit);
protected:
void paintEvent(QPaintEvent *event);
bool eventFilter(QObject *obj, QEvent *ev);
int getIndex(QLineEdit *pEdit);
bool isTextValid(const QString &strIP);
private:
static QString getIPItemStr(unsigned char item);
private:
QLineEdit *m_lineEidt[4];
};
#endif // TLINEEDITIP_H
//--------------------TLineEditIP.cpp--------------------
#include "TLineEditIP.h"
#include <QRegExpValidator>
#include <QPainter>
#include <QHBoxLayout>
#include <QKeyEvent>
#include <QMessageBox>
#include <QDebug>
TLineEditIP::TLineEditIP(QWidget *parent)
:QLineEdit(parent)
{
QRegExp rx("(2[0-5]{2}|2[0-4][0-9]|1?[0-9]{1,2})");
QHBoxLayout *pHBox = new QHBoxLayout(this);
pHBox->setSpacing(4);
pHBox->setContentsMargins(4,4,2,4);
for (int i = 0; i < 4; i++)
{
m_lineEidt[i] = new QLineEdit(this);
m_lineEidt[i]->setFrame(false);
m_lineEidt[i]->setMaxLength(3);
m_lineEidt[i]->setTextMargins(0,0,0,0);
m_lineEidt[i]->setAlignment(Qt::AlignCenter);
m_lineEidt[i]->installEventFilter(this);
m_lineEidt[i]->setValidator(new QRegExpValidator(rx, this));
m_lineEidt[i]->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
m_lineEidt[i]->setStyleSheet("QLineEdit{font: 12px \"Microsoft YaHei\";color:rgb(119,119,119);background-color:rgb(255,255,255);border:none;}");
m_lineEidt[i]->setAttribute(Qt::WA_MacShowFocusRect, 0);
m_lineEidt[i]->setContextMenuPolicy(Qt::NoContextMenu);
pHBox->addWidget(m_lineEidt[i]);
}
this->setReadOnly(true);
this->setContextMenuPolicy(Qt::NoContextMenu);
installEventFilter(this);
connect(this, SIGNAL(signalTextChanged(QLineEdit*)),
this, SLOT(slotTextChanged(QLineEdit*)),
Qt::QueuedConnection);
}
TLineEditIP::~TLineEditIP()
{
}
void TLineEditIP::paintEvent(QPaintEvent *event)
{
QLineEdit::paintEvent(event);
QPainter painter(this);
QBrush brush;
brush.setStyle(Qt::BrushStyle::SolidPattern);
brush.setColor(Qt::black);
painter.setBrush(brush);
int width = 0;
for (int i = 0; i < 3; i++)
{
width += m_lineEidt[i]->width() + (i == 0 ? 4 : 5);//布局的间隔
painter.drawEllipse(width, height() / 2 - 1, 1, 1);
}
}
QString TLineEditIP::getIPItemStr(unsigned char item)
{
return QString("%1\n").arg(item);
}
void TLineEditIP::slotTextChanged(QLineEdit* pEdit)
{
for (unsigned int i = 0; i != QTUTL_IP_SIZE; ++i)
{
if (pEdit == m_lineEidt[i])
{
if (pEdit->text().size() == getIPItemStr(UCHAR_MAX).size() &&
pEdit->text().size() == pEdit->cursorPosition())
{
// auto-move to next item
if (i + 1 != QTUTL_IP_SIZE)
{
m_lineEidt[i + 1]->setFocus();
m_lineEidt[i + 1]->selectAll();
}
}
}
}
}
int TLineEditIP::getIndex(QLineEdit *pEdit)
{
int index = -1;
for (int i = 0; i < 4; i++)
{
if (pEdit == m_lineEidt[i])
index = i;
}
return index;
}
bool TLineEditIP::eventFilter(QObject *obj, QEvent *event)
{
bool bRes = QLineEdit::eventFilter(obj, event);
if (event->type() == QEvent::Show)
{
if (obj == this)
{
m_lineEidt[0]->setFocus();
m_lineEidt[0]->setCursorPosition(m_lineEidt[0]->text().size());
m_lineEidt[0]->selectAll();
}
}
else if (event->type() == QEvent::KeyPress)
{
QKeyEvent* pEvent = dynamic_cast<QKeyEvent*>(event);
if (pEvent)
{
for (unsigned int i = 0; i != QTUTL_IP_SIZE; ++i)
{
QLineEdit* pEdit = m_lineEidt[i];
if (pEdit == obj)
{
switch (pEvent->key())
{
case Qt::Key_Left:
if (pEdit->cursorPosition() == 0)
{
// user wants to move to previous item
m_lineEidt[i > 0 ? i - 1 : QTUTL_IP_SIZE - 1]->setFocus();
m_lineEidt[i > 0 ? i - 1 : QTUTL_IP_SIZE - 1]->setCursorPosition(m_lineEidt[i > 0 ? i - 1 : QTUTL_IP_SIZE - 1]->text().size());
m_lineEidt[i > 0 ? i - 1 : QTUTL_IP_SIZE - 1]->selectAll();
}
break;
case Qt::Key_Right:
if (pEdit->text().isEmpty() ||(pEdit->text().size() == pEdit->cursorPosition()))
{
// user wants to move to next item
m_lineEidt[i + 1 != QTUTL_IP_SIZE ? i + 1 : 0]->setFocus();
m_lineEidt[i + 1 != QTUTL_IP_SIZE ? i + 1 : 0]->setCursorPosition(0);
}
break;
case Qt::Key_Return:
case Qt::Key_Tab:
{
m_lineEidt[i + 1 != QTUTL_IP_SIZE ? i + 1 : 0]->setFocus();
m_lineEidt[i + 1 != QTUTL_IP_SIZE ? i + 1 : 0]->setCursorPosition(0);
m_lineEidt[i + 1 != QTUTL_IP_SIZE ? i + 1 : 0]->selectAll();
return true;
}
case Qt::Key_Backspace:
{
QString strText = pEdit->text();
if (!strText.length() || strText.length() && !pEdit->cursorPosition())
{
int index = getIndex(pEdit);
if (index != -1 && index != 0)
{
m_lineEidt[index - 1]->setFocus();
int length = m_lineEidt[index - 1]->text().length();
m_lineEidt[index - 1]->setCursorPosition(length ? length : 0);
}
}
return QLineEdit::eventFilter(obj, event);
}
default:
emit signalTextChanged(pEdit);
}
break;
}
}
}
}
return bRes;
}
void TLineEditIP::setText(const QString &strIP)
{
if (!isTextValid(strIP))
{
QMessageBox::warning(this, "Attention", "Your IP Address is Invalid!", QMessageBox::StandardButton::Ok);
return;
}
else
{
int i = 0;
QStringList ipList = strIP.split(".");
foreach (const QString &ip, ipList)
{
m_lineEidt[i]->setText(ip);
i++;
}
}
m_lineEidt[0]->selectAll();
}
bool TLineEditIP::isTextValid(const QString &strIP)
{
QRegExp rx2("\\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");
if (!rx2.exactMatch(strIP))
return false;
return true;
}
QString TLineEditIP::text() const
{
return QString("%1.%2.%3.%4")
.arg(m_lineEidt[0]->text().isEmpty() ? "0" : m_lineEidt[0]->text())
.arg(m_lineEidt[1]->text().isEmpty() ? "0" : m_lineEidt[1]->text())
.arg(m_lineEidt[2]->text().isEmpty() ? "0" : m_lineEidt[2]->text())
.arg(m_lineEidt[3]->text().isEmpty() ? "0" : m_lineEidt[3]->text());
}
2.通过QLineEdit成员函数setInputMask("000.000.000.000;_")+setValidator也能实现相关IP输入(但光标效果和删除效果不大理想，具体接口可参看QLineEdit文档)；
时间： 2024-10-12 19:42:00