QT自定义指示灯（可闪烁、可移动）

资源内容介绍

QT实现指示灯控件。一般有2种形式：1、使用QPixmap绘制指示灯；2、在paintEvent中使用QPainter来绘制。本示例对这两种形式做了封装，实现了两种不同的指示灯。都可闪烁、可移动。

#include "roundlamp.h"RoundLamp::RoundLamp(QWidget *parent) : Lamp(parent){ setFixedSize(50,50); m_onColor=QColor("green"); m_offColor=QColor(125,125,125); setTickTime(m_tickTime);}RoundLamp::~RoundLamp(){}void RoundLamp::upFrameOut(QPainter *p,int r){ p->save(); QLinearGradient gradient(0,-r,0,r); gradient.setColorAt(1,QColor(166,166,166)); gradient.setColorAt(0,QColor(255,255,255)); gradient.setSpread(QGradient::PadSpread); p->setBrush(gradient); p->drawEllipse(-r,-r,2*r,2*r); p->restore(); update();}void RoundLamp::upFrameIn(QPainter *p, int r){ p->save(); QLinearGradient gradient(0,-r,0,r); gradient.setColorAt(0,QColor(166,166,166)); gradient.setColorAt(1,QColor(255,255,255)); gradient.setSpread(QGradient::PadSpread); p->setBrush(gradient); p->drawEllipse(-r,-r,2*r,2*r); p->restore(); update();}void RoundLamp::upLampColor(QPainter *p,int r){ p->save(); if(m_state) { if(m_canTick) { if(m_tickState) p->setBrush(m_onColor); else p->setBrush(m_offColor); } else p->setBrush(m_onColor); } else p->setBrush(m_offColor); p->drawEllipse(-r,-r,2*r,2*r); p->restore(); update();}void RoundLamp::setTickTime(int tickTime){ m_tickTimer.setInterval(tickTime); connect(&m_tickTimer,&QTimer::timeout,this,[this]{ if(m_tickState) m_tickState=false; else m_tickState=true; });}void RoundLamp::paintEvent(QPaintEvent *event){ Q_UNUSED(event); int width=this->width(); int height=this->height(); int side=qMin(width,height); QPainter p(this); p.translate(width/2,height/2); p.scale(side/200.0,side/200.0); p.setPen(Qt::NoPen); if(m_canTick&&(!m_tickTimer.isActive())) m_tickTimer.start(m_tickTime); else if(!m_canTick&&m_tickTimer.isActive()) m_tickTimer.stop(); upFrameOut(&p,99); upFrameIn(&p,90); upLampColor(&p,80); upText(&p);}void RoundLamp::setOnColor(QColor onColor){ m_onColor = onColor; update();}