本文共 3319 字，大约阅读时间需要 11 分钟。

Qt Led开关效果

以下源码来自开源项目

程序效果

hled.h

#ifndef HLED_H#define HLED_H#include 
   
    class QColor;class HLed : public QWidget{       Q_OBJECTpublic:    HLed(QWidget *parent = 0);    ~HLed();    QColor color() const;    QSize sizeHint() const;    QSize minimumSizeHint() const;public slots:    void setColor(const QColor &color);    void toggle();    void turnOn(bool on=true);    void turnOff(bool off=true);protected:    void paintEvent(QPaintEvent *);    int ledWidth() const;private:    struct Private;    Private * const m_d;};#endif // HLED_H
   

hled.cpp

#include 
   
    #include "hled.h"struct HLed::Private{   public:    Private()        : darkerFactor(300), color(Qt::green), isOn(true)    {    }    int darkerFactor;    QColor color;    bool isOn;};HLed::HLed(QWidget *parent)    :QWidget(parent), m_d(new Private){   }HLed::~HLed(){       delete m_d;}QColor HLed::color() const{       return m_d->color;}void HLed::setColor(const QColor &color){       if (m_d->color == color)        return;    update();}QSize HLed::sizeHint() const{       return QSize(20, 20);}QSize HLed::minimumSizeHint() const{       return QSize(16, 16);}void HLed::toggle(){       m_d->isOn = !m_d->isOn;    update();}void HLed::turnOn(bool on){       m_d->isOn = on;    update();}void HLed::turnOff(bool off){       turnOn(!off);}void HLed::paintEvent(QPaintEvent * /*event*/){       int width = ledWidth();    QPainter painter(this);    painter.setRenderHint(QPainter::Antialiasing);    QColor color = m_d->isOn ? m_d->color                             : m_d->color.darker(m_d->darkerFactor);    QBrush brush;    brush.setStyle(Qt::SolidPattern);    brush.setColor(color);    painter.setBrush(brush);    // draw plain    painter.drawEllipse(1, 1, width-1, width-1);    QPen pen;    pen.setWidth(2);    int pos = width / 5 + 1;    int lightWidth = width * 2 / 3;    int lightQuote = 130 * 2 / (lightWidth ? lightWidth : 1) + 100;    // draw bright spot    while (lightWidth) {           color = color.lighter(lightQuote);        pen.setColor(color);        painter.setPen(pen);        painter.drawEllipse(pos, pos, lightWidth, lightWidth);        lightWidth--;        if (!lightWidth)            break;        painter.drawEllipse(pos, pos, lightWidth, lightWidth);        lightWidth--;        if (!lightWidth)            break;        painter.drawEllipse(pos, pos, lightWidth, lightWidth);        pos++;        lightWidth--;    }    //draw border    painter.setBrush(Qt::NoBrush);    int angle = -720;    color = palette().color(QPalette::Light);    for (int arc=120; arc<2880; arc+=240) {           pen.setColor(color);        painter.setPen(pen);        int w = width - pen.width()/2;        painter.drawArc(pen.width()/2, pen.width()/2, w, w, angle+arc, 240);        painter.drawArc(pen.width()/2, pen.width()/2, w, w, angle-arc, 240);        color = color.darker(110);    }}int HLed::ledWidth() const{       int width = qMin(this->width(), this->height());    width -= 2;    return width > 0 ? width : 0;}
   

调用示例

HLed *led;led = new HLed(Dialog);led->setObjectName(QString::fromUtf8("led"));led->setSizePolicy(sizePolicy);led->setMinimumSize(QSize(20, 20));led->setMaximumSize(QSize(25, 25));horizontalLayout->addWidget(led);led->turnOff();//默认关闭//update led's statusled->turnOn(port->isOpen());

源码下载

Github无法访问时可以通过下发地址直接下载

转载地址：http://hwxaz.baihongyu.com/