Qt to write custom 68-IP address input box

I. Introduction

The IP address input box control, it is estimated write rotten, a casual online search to ensure that a lot, because this estimate is too easy controls, ideal for novice practiced hand, the general idea is using four qlineedit controls put together, and then each input block is provided regular expression to only 3 digits, then install event filter identifying the transport automatically jumps to the next input frame. On how to set up a regular expression filtering, this search can be found, I do not quite understand this rule, looks like there is a special book devoted to the regular expression, this may be very powerful.

Open Source Address: https://gitee.com/feiyangqingyun/QWidgetDemo https://github.com/feiyangqingyun/QWidgetDemo

Second, the realization of functions

• 1: IP address can be provided, block autofill
• 2: Empty IP address
• 3: Press support automatic switching of small dots
• 4: Support Backspace key switches
• 5: Support IP address filtering
• 6: The background color can be set / border color / border fillet angle

Third, renderings

Fourth, the header file code

#ifndef IPADDRESS_H
#define IPADDRESS_H

/**
 * IP地址输入框控件 作者:feiyangqingyun(QQ:517216493) 2017-8-11
 * 1:可设置IP地址,自动填入框
 * 2:可清空IP地址
 * 3:支持按下小圆点自动切换
 * 4:支持退格键自动切换
 * 5:支持IP地址过滤
 * 6:可设置背景色/边框颜色/边框圆角角度
 */

#include <QWidget>

class QLabel;
class QLineEdit;

#ifdef quc
#if (QT_VERSION < QT_VERSION_CHECK(5,7,0))
#include <QtDesigner/QDesignerExportWidget>
#else
#include <QtUiPlugin/QDesignerExportWidget>
#endif

class QDESIGNER_WIDGET_EXPORT IPAddress : public QWidget
#else
class IPAddress : public QWidget
#endif

{
    Q_OBJECT
    Q_PROPERTY(QString ip READ getIP WRITE setIP)

public:
    explicit IPAddress(QWidget *parent = 0);

protected:
    bool eventFilter(QObject *watched, QEvent *event);

private:
    QLabel *labDot1;    //第一个小圆点
    QLabel *labDot2;    //第二个小圆点
    QLabel *labDot3;    //第三个小圆点

    QLineEdit *txtIP1;  //IP地址网段输入框1
    QLineEdit *txtIP2;  //IP地址网段输入框2
    QLineEdit *txtIP3;  //IP地址网段输入框3
    QLineEdit *txtIP4;  //IP地址网段输入框4

    QString ip;         //IP地址
    QString bgColor;    //背景颜色
    QString borderColor;//边框颜色
    int borderRadius;   //边框圆角角度

private slots:
    void textChanged(const QString &text);

public:
    //获取IP地址
    QString getIP()                 const;

    QSize sizeHint()                const;
    QSize minimumSizeHint()         const;

public Q_SLOTS:
    //设置IP地址
    void setIP(const QString &ip);
    //清空
    void clear();

    //设置背景颜色
    void setBgColor(const QString &bgColor);
    //设置边框颜色
    void setBorderColor(const QString &borderColor);
    //设置边框圆角角度
    void setBorderRadius(int borderRadius);

};

#endif // IPADDRESS_H

Fifth, the core code

#pragma execution_character_set("utf-8")

#include "ipaddress.h"
#include "qlabel.h"
#include "qlineedit.h"
#include "qboxlayout.h"
#include "qregexp.h"
#include "qvalidator.h"
#include "qevent.h"
#include "qdebug.h"

IPAddress::IPAddress(QWidget *parent) : QWidget(parent)
{
    bgColor = "#FFFFFF";
    borderColor = "#A6B5B8";
    borderRadius = 3;

    //用于显示小圆点的标签,居中对齐
    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(".");

    //用于输入IP地址的文本框,居中对齐
    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)));

    //设置IP地址校验过滤
    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);

    //绑定事件过滤器,识别键盘按下
    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);

    //将控件按照横向布局排列
    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;

            //如果当前按下了小数点则移动焦点到下一个输入框
            if (key->text() == ".") {
                this->focusNextChild();
            }

            //如果按下了退格键并且当前文本框已经没有了内容则焦点往前移
            if (key->key() == Qt::Key_Backspace) {
                if (txt->text().length() <= 1) {
                    this->focusNextPrevChild(false);
                }
            }
        }
    }

    return QWidget::eventFilter(watched, event);
}

void IPAddress::textChanged(const QString &text)
{
    int len = text.length();
    int value = text.toInt();

    //判断当前是否输入完成一个网段,是的话则自动移动到下一个输入框
    if (len == 3) {
        if (value >= 100 && value <= 255) {
            this->focusNextChild();
        }
    }

    //拼接成完整IP地址
    ip = QString("%1.%2.%3.%4").arg(txtIP1->text()).arg(txtIP2->text()).arg(txtIP3->text()).arg(txtIP4->text());
}

QString IPAddress::getIP() const
{
    return this->ip;
}

QSize IPAddress::sizeHint() const
{
    return QSize(250, 20);
}

QSize IPAddress::minimumSizeHint() const
{
    return QSize(30, 10);
}

void IPAddress::setIP(const QString &ip)
{
    //先检测IP地址是否合法
    QRegExp regExp("((2[0-4]\\d|25[0-5]|[01]?\\d\\d?)\\.){3}(2[0-4]\\d|25[0-5]|[01]?\\d\\d?)");
    if (!regExp.exactMatch(ip)) {
        return;
    }

    if (this->ip != ip) {
        this->ip = ip;

        //将IP地址填入各个网段
        QStringList list = ip.split(".");
        txtIP1->setText(list.at(0));
        txtIP2->setText(list.at(1));
        txtIP3->setText(list.at(2));
        txtIP4->setText(list.at(3));
    }
}

void IPAddress::clear()
{
    txtIP1->clear();
    txtIP2->clear();
    txtIP3->clear();
    txtIP4->clear();
    txtIP1->setFocus();
}

void IPAddress::setBgColor(const QString &bgColor)
{
    if (this->bgColor != bgColor) {
        this->bgColor = bgColor;
    }
}

void IPAddress::setBorderColor(const QString &borderColor)
{
    if (this->borderColor != borderColor) {
        this->borderColor = borderColor;
    }
}

void IPAddress::setBorderRadius(int borderRadius)
{
    if (this->borderRadius != borderRadius) {
        this->borderRadius = borderRadius;
    }
}

Sixth, the controls described

1. More than 160 exquisite control, covers a variety of dashboards, progress bar, the progress of the ball, compass, graphs, scales, thermometers, navigation bar, navigation bar, flatui, highlight the button, slide the selector, the lunar calendar and so on. Qwt far more than the number of controls integration.
2. Each class can be independently as a separate control, zero coupling each control file and a header file to achieve a code amount, independent of other files to facilitate individual control integrated into the project source code form, less. qwt interlocking control class, highly coupled, want to use one of the controls, must contain all the code.
3. Write all pure Qt, QWidget + QPainter to draw, to support any Qt version Qt4.6 Qt5.13, support for mingw, msvc, gcc compiler, etc., support any operating system such as windows + linux + mac + embedded linux, which does not garbled can be directly integrated into Qt Creator, a built-in controls and use the same, most of the effects can be as long as several properties are set, very convenient.
4. DEMO separate source containing the control corresponding to each control has a convenient reference. It also provides integrated use of all controls a DEMO.
5. Source code for each control has detailed Chinese annotation, are prepared in accordance with unified design specifications, easy to learn to write custom controls.
6. Each control default color and demo corresponding color is very beautiful.
7. More than 130 visible control, six invisible control.
8. Portion control provides a variety of styles style selection, multiple choice style indicator.
9. All controls changes adaptive stretched form.
10. Integrated design custom attribute that supports drag design, WYSIWYG support the import and export in xml format.
11. Activex control that comes with demo, all controls can be run directly in the browser ie.
12. Fontawesome integrated graphics font + Alibaba iconfont collection of hundreds of graphic fonts, font fun graphic brings.
13. All controls and finally generate a dynamic library files (dll or so, etc.) can be integrated directly into qtcreator designed for use in drag.
14. Already qml version, the latter will consider a pyqt version, if the user is in great demand then.
15. Custom plug-in open dynamic library (permanent free), and the back door without any restrictions, ease of use.
16. Now offers 32 versions of the dll, which qt_5_7_0_mingw530_32 this version will always ensure that the latest complete.
17. From time to time to increase control and improve controls, regularly updated SDK, to welcome all suggestions, thank you!
18. Qt introductory books recommended Huo Yafei of "Qt Creator Quick Start" "Qt5 programming entry", Qt official Advanced book recommendations "C ++ GUI Qt4 programming."
19. Highly recommended programmer self-discipline and planning book series "lying programmer" "Programmer's growth course", "grief programmer", benefited from a lifetime!
20. SDK Address: https://gitee.com/feiyangqingyun/QUCSDK https://github.com/feiyangqingyun/qucsdk