《Qt5+电子时钟》

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mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>


namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    void mousePressEvent(QMouseEvent *);
    void mouseMoveEvent(QMouseEvent *);
public slots:
    void showTime();                 	//显示当前的时间
private:
    Ui::MainWindow *ui;
    QPoint dragPosition;            	//保存鼠标点相对电子时钟窗体左上角的偏移值
    bool showColon;                  	//用于显示时间时是否显示“：”
};

#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QTimer>
#include <QTime>
#include <QMouseEvent>
#include <QLCDNumber>



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


    QPalette p=palette();
    p.setColor(QPalette::Window,Qt::blue);
    setPalette(p);

    setWindowFlags(Qt::FramelessWindowHint);

    setWindowOpacity(0.5);

    QTimer *timer=new QTimer(this);
    connect(timer,SIGNAL(timeout()),this,SLOT(showTime()));
    timer->start(1000);
    showTime();
    resize(150,60);
    showColon=true;                                 //初始化
}

void MainWindow::showTime()
{
    QTime time=QTime::currentTime();
    QString text=time.toString("hh:mm");
    if(showColon)
    {
        text[2]=':';
        showColon=false;
    }
    else
    {
        text[2]=' ';
        showColon=true;
    }
    ui->lcdNumber->display(text);
}

void MainWindow::mousePressEvent(QMouseEvent *event)
{
    if(event->button()==Qt::LeftButton)
    {
        dragPosition=event->globalPos()-frameGeometry().topLeft();
        event->accept();
    }
    if(event->button()==Qt::RightButton)
    {
        close();
    }
}
void MainWindow::mouseMoveEvent(QMouseEvent *event)
{
    if(event->buttons()&Qt::LeftButton)
    {
        move(event->globalPos()-dragPosition);
        event->accept();
    }
}

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

显示结果

链接：https://pan.baidu.com/s/15JqKVUztROLQH6_C7ddqAQ 
提取码：uq6v