day03 1.Qt核心机制

widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QTimer>            //定时器类
#include <QTime>            //时间类
#include <QTimerEvent>       //定时器事件类
#include <QDateTime>         //日期时间类
#include <QPushButton>
#include <QTextEdit>
#include <QLCDNumber>
#include <QLineEdit>
#include <QKeyEvent>          //键盘事件类
#include <QTextToSpeech>
#include <QPainter>
QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();

    void mouseMoveEvent(QMouseEvent *event) override;
    void mousePressEvent(QMouseEvent *event) override;         //鼠标移动事件处理函数
signals:
    void btn1_signal();
    void btn2_signal();




public slots:
    void btn1_slots();
    void btn2_slots();

    void timeout_slot();  //自定义处理超时信号的槽函数

private:
    Ui::Widget *ui;
    QPoint temp;        //中间辅助向量

    QPushButton *btn1;
    QPushButton *btn2;
    QTextToSpeech *speecher;     //定义播报员指针
    QLCDNumber *lcdNumber;

    //定义一个定时器变
    QTimer t1;
};
#endif // WIDGET_H

widget.cpp

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

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
    , btn1(new QPushButton(this))
    , btn2(new QPushButton(this))
    , lcdNumber(new QLCDNumber(this)) // 初始化 QLCDNumber
    , t1(new QTimer(this))
{
    ui->setupUi(this);

    this->setWindowFlag(Qt::FramelessWindowHint);   //去除控件的头部

    btn1 ->setParent(this);     //将自定义的界面当作按钮的父组件
    btn2 ->setParent(this);
    btn1 ->setText("启动");
    btn2 ->setText("取消");
    btn1 ->move(450,200);
    btn2 ->move(600,200);

    QTextEdit *textEdit = new QTextEdit(this);    //设置文本框
    textEdit->setPlaceholderText("请输入");        // 设置占位符文本
    textEdit ->setGeometry(50,250,700,300);      //设置位置和大小

    lcdNumber->setGeometry(50,50,300,150);

    QLineEdit *lineEdit = new QLineEdit(this);
    lineEdit ->setGeometry(450,50,300,100);

    //将按钮1绑定到对应的槽函数1上
    connect(this->btn1,&QPushButton::clicked,[this](){this->btn1_slots();});
    //将按钮2绑定到对应的槽函数2上
    connect(this->btn2,&QPushButton::clicked,[this](){this->btn2_slots();});

    connect(&t1, &QTimer::timeout, this, &Widget::timeout_slot);
}

Widget::~Widget()
{
    delete ui;
    delete lcdNumber; // 删除 QLCDNumber 实例
}

void Widget::mouseMoveEvent(QMouseEvent *event)
{
    this->move(event->globalPos()-temp);
}

void Widget::mousePressEvent(QMouseEvent *event)
{
    temp = event->globalPos() - this->pos();
    if(event->button() == Qt::RightButton)
    {
        this->close();
    }
}

void Widget::btn1_slots()   //自定义槽函数的实现
{
    t1.start(1000);        //每隔指定的时间，发送一个timeout的信号
}

void Widget::btn2_slots()   //自定义槽函数的实现
{
    t1.stop();
}

void Widget::timeout_slot()
{
    //获取系统的时间
    QTime sysTime = QTime::currentTime();
    //将QTime类对象转变成字符串
    QString tm = sysTime.toString("hh:mm");
    //将时间展示到ui界面上
    this->lcdNumber->display(tm);

    if(sysTime.second()%2==0)
    {
        tm[2] = ':';
    }else
    {
        tm[2] = ' ';
    }


    this->lcdNumber->display(tm);


}