QLineEdit 实现ip输入 |
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QLineEdit 实现ip输入
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工程目录如下
创建一个 基于QWidget 的空白工程,添加 C++ class ,也就是 iplineedit.cpp 和 iplienedit.h 这两个文件, 新添加的用于继承 QLineEdit 类重新写一个用于ip输入的类 iplineedit.cpp 文件内容: #include "iplineedit.h" #include #include #include #include #include #include IPLineEdit::IPLineEdit(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(10); pHBox->setContentsMargins(0, 0, 0, 0); for (int i = 0; i < 4; i++) { m_lineEidt[i] = new QLineEdit(this); m_lineEidt[i]->setStyleSheet("background:rgb(222,122,112);"); // 输入框背景 QColor(222,122,112) m_lineEidt[i]->setFrame(false); m_lineEidt[i]->setMaxLength(3); 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); pHBox->addWidget(m_lineEidt[i]); } this->setReadOnly(true); } IPLineEdit::~IPLineEdit() { } void IPLineEdit::paintEvent(QPaintEvent *event) { QWidget::paintEvent(event); QPainter painter(this); QBrush brush; brush.setStyle(Qt::BrushStyle::SolidPattern); QPen pen; int width = 0; for (int i = 0; i < 3; i++) { width += m_lineEidt[i]->width() + (i == 0 ? 3 : 10);//布局的间隔 // 画矩形,画为与输入栏相同颜色 brush.setColor(QColor(222,122,112)); // 设置画刷颜色 painter.setBrush(brush); pen.setColor(QColor(222,122,112)); // 设置画笔颜色 painter.setPen(pen); painter.drawRect(width-4, 0, 10, height()); // 画IP 点分 brush.setColor(Qt::black); // 设置画刷颜色 painter.setBrush(brush); pen.setColor(QColor(0,0,0)); // 设置画笔颜色 painter.setPen(pen); painter.drawEllipse(width, height()/2-2, 4, 4); // 点分 } } int IPLineEdit::getIndex(QLineEdit *pEdit) { int index = -1; for (int i = 0; i < 4; i++) { if (pEdit == m_lineEidt[i]) index = i; } return index; } bool IPLineEdit::eventFilter(QObject *obj, QEvent *ev) { if (children().contains(obj) && QEvent::KeyPress == ev->type()) { QKeyEvent *keyEvent = dynamic_cast(ev); QLineEdit *pEdit = qobject_cast(obj); switch (keyEvent->key()) { case Qt::Key_0: case Qt::Key_1: case Qt::Key_2: case Qt::Key_3: case Qt::Key_4: case Qt::Key_5: case Qt::Key_6: case Qt::Key_7: case Qt::Key_8: case Qt::Key_9: { QString strText = pEdit->text(); if (pEdit->selectedText().length()) { pEdit->text().replace(pEdit->selectedText(), QChar(keyEvent->key())); } else if (strText.length() == 3 || strText.length() < 3 && strText.toInt() * 10 > 255) { int index = getIndex(pEdit); if (index != -1 && index != 3) { m_lineEidt[index + 1]->setFocus(); m_lineEidt[index + 1]->selectAll(); } } else if (strText.length() == 2 && strText.toInt() * 10 < 255) { if (Qt::Key_0 == keyEvent->key() && strText.toInt()) { pEdit->setText(strText.insert(pEdit->cursorPosition(), QChar(Qt::Key_0))); } } return QWidget::eventFilter(obj, ev); } break; 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 QWidget::eventFilter(obj, ev); } case Qt::Key_Left: { if (!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 QWidget::eventFilter(obj, ev); } case Qt::Key_Right: { if (pEdit->cursorPosition() == pEdit->text().length()) { int index = getIndex(pEdit); if (index != -1 && index != 3) { m_lineEidt[index + 1]->setFocus(); m_lineEidt[index + 1]->setCursorPosition(0); } } return QWidget::eventFilter(obj, ev); } default: break; } } return false; } void IPLineEdit::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(QString ip , ipList) { m_lineEidt[i]->setText(ip); i++; } } } bool IPLineEdit::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 IPLineEdit::text() const { QString strIP; for (int i = 0; i < 4; i++) { strIP.append(m_lineEidt[i]->text()); if(imove(100,100); ip->resize(200,50); ip->show(); // 使用定时 2 秒打印一次ip输入框的内容 QTimer *timer = new QTimer(this); connect(timer,&QTimer::timeout,this, [=]() { qDebug() |
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