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本篇內(nèi)容介紹了“Qt如何實(shí)現(xiàn)IP地址輸入控件”的有關(guān)知識(shí),在實(shí)際案例的操作過(guò)程中,不少人都會(huì)遇到這樣的困境,接下來(lái)就讓小編帶領(lǐng)大家學(xué)習(xí)一下如何處理這些情況吧!希望大家仔細(xì)閱讀,能夠?qū)W有所成!
這個(gè)IP地址輸入框控件,估計(jì)寫(xiě)爛了,網(wǎng)上隨便一搜索,保證一大堆,估計(jì)也是因?yàn)檫@個(gè)控件太容易了,非常適合新手練手,一般的思路都是用4個(gè)qlineedit控件拼起來(lái),然后每個(gè)輸入框設(shè)置正則表達(dá)式過(guò)濾只能輸入3位數(shù)字,然后安裝事件過(guò)濾器識(shí)別回車(chē)自動(dòng)跳到下一個(gè)輸入框。關(guān)于如何設(shè)置正則表達(dá)式過(guò)濾,這個(gè)可以搜索查到,本人也不大懂這個(gè)規(guī)則,貌似還有專(zhuān)門(mén)的書(shū)籍專(zhuān)門(mén)介紹正則表達(dá)式,可能這塊非常強(qiáng)大。
主要功能:
可設(shè)置IP地址,自動(dòng)填入框
可清空IP地址
支持按下小圓點(diǎn)自動(dòng)切換
支持退格鍵自動(dòng)切換
支持IP地址過(guò)濾
可設(shè)置背景色/邊框顏色/邊框圓角角度
IPAddress::IPAddress(QWidget *parent) : QWidget(parent) { bgColor = "#FFFFFF"; borderColor = "#A6B5B8"; borderRadius = 3; //用于顯示小圓點(diǎn)的標(biāo)簽,居中對(duì)齊 labDot1 = new QLabel; labDot1->setAlignment(Qt::AlignCenter); labDot1->setText("."); labDot2 = new QLabel; labDot2->setAlignment(Qt::AlignCenter); labDot2->setText("."); labDot3 = new QLabel; labDot3->setAlignment(Qt::AlignCenter); labDot3->setText("."); //用于輸入IP地址的文本框,居中對(duì)齊 txtIP1 = new QLineEdit; txtIP1->setObjectName("txtIP1"); txtIP1->setAlignment(Qt::AlignCenter); txtIP1->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding); connect(txtIP1, SIGNAL(textChanged(QString)), this, SLOT(textChanged(QString))); txtIP2 = new QLineEdit; txtIP2->setObjectName("txtIP2"); txtIP2->setAlignment(Qt::AlignCenter); txtIP2->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding); connect(txtIP2, SIGNAL(textChanged(QString)), this, SLOT(textChanged(QString))); txtIP3 = new QLineEdit; txtIP3->setObjectName("txtIP3"); txtIP3->setAlignment(Qt::AlignCenter); txtIP3->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding); connect(txtIP3, SIGNAL(textChanged(QString)), this, SLOT(textChanged(QString))); txtIP4 = new QLineEdit; txtIP4->setObjectName("txtIP4"); txtIP4->setAlignment(Qt::AlignCenter); txtIP4->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding); connect(txtIP4, SIGNAL(textChanged(QString)), this, SLOT(textChanged(QString))); //設(shè)置IP地址校驗(yàn)過(guò)濾 QRegExp regExp("(2[0-5]{2}|2[0-4][0-9]|1?[0-9]{1,2})"); QRegExpValidator *validator = new QRegExpValidator(regExp, this); txtIP1->setValidator(validator); txtIP2->setValidator(validator); txtIP3->setValidator(validator); txtIP4->setValidator(validator); //綁定事件過(guò)濾器,識(shí)別鍵盤(pán)按下 txtIP1->installEventFilter(this); txtIP2->installEventFilter(this); txtIP3->installEventFilter(this); txtIP4->installEventFilter(this); QFrame *frame = new QFrame; frame->setObjectName("frameIP"); QStringList qss; qss.append(QString("QFrame#frameIP{border:1px solid %1;border-radius:%2px;}").arg(borderColor).arg(borderRadius)); qss.append(QString("QLabel{min-width:15px;background-color:%1;}").arg(bgColor)); qss.append(QString("QLineEdit{background-color:%1;border:none;}").arg(bgColor)); qss.append(QString("QLineEdit#txtIP1{border-top-left-radius:%1px;border-bottom-left-radius:%1px;}").arg(borderRadius)); qss.append(QString("QLineEdit#txtIP4{border-top-right-radius:%1px;border-bottom-right-radius:%1px;}").arg(borderRadius)); frame->setStyleSheet(qss.join("")); QVBoxLayout *verticalLayout = new QVBoxLayout(this); verticalLayout->setMargin(0); verticalLayout->setSpacing(0); verticalLayout->addWidget(frame); //將控件按照橫向布局排列 QHBoxLayout *layout = new QHBoxLayout(frame); layout->setMargin(0); layout->setSpacing(0); layout->addWidget(txtIP1); layout->addWidget(labDot1); layout->addWidget(txtIP2); layout->addWidget(labDot2); layout->addWidget(txtIP3); layout->addWidget(labDot3); layout->addWidget(txtIP4); } bool IPAddress::eventFilter(QObject *watched, QEvent *event) { if (event->type() == QEvent::KeyPress) { QLineEdit *txt = (QLineEdit *)watched; if (txt == txtIP1 || txt == txtIP2 || txt == txtIP3 || txt == txtIP4) { QKeyEvent *key = (QKeyEvent *)event; //如果當(dāng)前按下了小數(shù)點(diǎn)則移動(dòng)焦點(diǎn)到下一個(gè)輸入框 if (key->text() == ".") { this->focusNextChild(); } //如果按下了退格鍵并且當(dāng)前文本框已經(jīng)沒(méi)有了內(nèi)容則焦點(diǎn)往前移 if (key->key() == Qt::Key_Backspace) { if (txt->text().length() <= 1) { this->focusNextPrevChild(false); } } } } return QWidget::eventFilter(watched, event); }
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