elapsedtimer.cpp

/*
 *  STM32Programming
 *
 *  Copyright 2015 - 2020 yangfuyuan
 *
 *
 */

#include "elapsedtimer.h"

ElapsedTimer::ElapsedTimer(QWidget *parent)
  : QLabel(parent) {
  timer = new QTime();
  setTextFormat(Qt::PlainText);
  setTextInteractionFlags(Qt::NoTextInteraction);
  setText(QString("0:00/0:00"));
  setVisible(false);
}

ElapsedTimer::~ElapsedTimer() {
  delete timer;
}

int ElapsedTimer::ms() {
  return (timer->elapsed());
}

void ElapsedTimer::update(unsigned long long progress,
                          unsigned long long total) {
  unsigned short eSec = 0, eMin = 0, eHour = 0;
  unsigned short tSec = 0, tMin = 0, tHour = 0;

  unsigned int baseSecs = timer->elapsed() / MS_PER_SEC;
  eSec = baseSecs % SECS_PER_MIN;

  if (baseSecs >= SECS_PER_MIN) {
    eMin = baseSecs / SECS_PER_MIN;

    if (baseSecs >= SECS_PER_HOUR) {
      eHour = baseSecs / SECS_PER_HOUR;
    }
  }

  unsigned int totalSecs = (unsigned int)((float)baseSecs * ((float)total /
                                          (float)progress));
  unsigned int totalMin = 0;
  tSec = totalSecs % SECS_PER_MIN;

  if (totalSecs >= SECS_PER_MIN) {
    totalMin = totalSecs / SECS_PER_MIN;
    tMin = totalMin % MINS_PER_HOUR;

    if (totalMin > MINS_PER_HOUR) {
      tHour = totalMin / MINS_PER_HOUR;
    }
  }

  const QChar &fillChar = QLatin1Char('0');
  QString qs = QString("%1:%2/").arg(eMin, 2, 10, fillChar).arg(eSec, 2, 10,
               fillChar);

  if (eHour > 0) {
    qs.prepend(QString("%1:").arg(eHour, 2, 10, fillChar));
  }

  if (tHour > 0) {
    qs += (QString("%1:").arg(tHour, 2, 10, fillChar));
  }

  qs += (QString("%1:%2 ").arg(tMin, 2, 10, fillChar).arg(tSec, 2, 10, fillChar));
  // added a space following the times to separate the text slightly from the right edge of the status bar...
  // there's probably a more "QT-correct" way to do that (like, margins or something),
  // but this was simple and effective.
  setText(qs);
  QCoreApplication::processEvents();//避免界面冻结
}

void ElapsedTimer::start() {
  setVisible(true);
  timer->start();
}

void ElapsedTimer::stop() {
  setVisible(false);
  setText(QString("0:00/0:00"));
}