QT时间编程之QT时钟

这节课我们做一个计时器

​ qtime：qt的时间类

​ qtimer：qt的定时类

代码

widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QTime>
#include <QTimer>

namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();

    QTimer timer;
    QTime time;

private slots:
    void on_startBt_clicked();
    void timeout_slot();

    void on_stopBt_clicked();

    void on_resetBt_clicked();

    void on_bitBt_clicked();

private:
    Ui::Widget *ui;
};

#endif // WIDGET_H

widget.cpp

#include "widget.h"
#include "ui_widget.h"

static int i;

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);

    connect(&timer, SIGNAL(timeout()), this, SLOT(timeout_slot()));

    time.setHMS(0, 0, 0, 0);
    ui->showTime->setText("00:00:00.000");
}

Widget::~Widget()
{
    delete ui;
}

void Widget::on_startBt_clicked()
{
    timer.start(1); //ms
}

void Widget::timeout_slot()
{
    time = time.addMSecs(1);
    ui->showTime->setText(time.toString("hh:mm:ss.zzz"));
}

void Widget::on_stopBt_clicked()
{
    timer.stop();
}

void Widget::on_resetBt_clicked()
{
    timer.stop();
    time.setHMS(0, 0, 0, 0);
    ui->showTime->setText("00:00:00.000");
    ui->bitTime->clear();
    i=0;
}

void Widget::on_bitBt_clicked()
{
    ui->bitTime->append(QString::number(++i)+":\n"+time.toString("hh:mm:ss.zzz"));
}

widget.ui

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>Widget</class>
 <widget class="QWidget" name="Widget">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>649</width>
    <height>393</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>Widget</string>
  </property>
  <layout class="QGridLayout" name="gridLayout">
   <item row="0" column="0">
    <layout class="QVBoxLayout" name="verticalLayout">
     <item>
      <widget class="QLabel" name="showTime">
       <property name="font">
        <font>
         <pointsize>29</pointsize>
        </font>
       </property>
       <property name="text">
        <string/>
       </property>
       <property name="alignment">
        <set>Qt::AlignCenter</set>
       </property>
      </widget>
     </item>
     <item>
      <layout class="QHBoxLayout" name="horizontalLayout">
       <item>
        <widget class="QPushButton" name="startBt">
         <property name="text">
          <string>开始</string>
         </property>
        </widget>
       </item>
       <item>
        <spacer name="horizontalSpacer">
         <property name="orientation">
          <enum>Qt::Horizontal</enum>
         </property>
         <property name="sizeHint" stdset="0">
          <size>
           <width>40</width>
           <height>20</height>
          </size>
         </property>
        </spacer>
       </item>
       <item>
        <widget class="QPushButton" name="stopBt">
         <property name="text">
          <string>停止</string>
         </property>
        </widget>
       </item>
       <item>
        <spacer name="horizontalSpacer_2">
         <property name="orientation">
          <enum>Qt::Horizontal</enum>
         </property>
         <property name="sizeHint" stdset="0">
          <size>
           <width>40</width>
           <height>20</height>
          </size>
         </property>
        </spacer>
       </item>
       <item>
        <widget class="QPushButton" name="resetBt">
         <property name="text">
          <string>重置</string>
         </property>
        </widget>
       </item>
       <item>
        <spacer name="horizontalSpacer_3">
         <property name="orientation">
          <enum>Qt::Horizontal</enum>
         </property>
         <property name="sizeHint" stdset="0">
          <size>
           <width>40</width>
           <height>20</height>
          </size>
         </property>
        </spacer>
       </item>
       <item>
        <widget class="QPushButton" name="bitBt">
         <property name="text">
          <string>打点</string>
         </property>
        </widget>
       </item>
      </layout>
     </item>
     <item>
      <widget class="QTextBrowser" name="bitTime"/>
     </item>
    </layout>
   </item>
  </layout>
 </widget>
 <layoutdefault spacing="6" margin="11"/>
 <resources/>
 <connections/>
</ui>