QT 第四天

一、设置一个闹钟

.pro

QT       += core gui texttospeechgreaterThan(QT_MAJOR_VERSION, 4): QT += widgetsCONFIG += c++11# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

.h

#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>
#include <QLabel>    //标签
#include <QLineEdit> //行编辑器
#include <QPushButton>//按钮
#include <QTextEdit>  //文本编辑器
#include <QTextToSpeech>  //文本转语音的头文件
#include <QTimer>   //定时器类的头文件
#include <QTime>    //时间类
#include <QTimerEvent>//定时器时间处理类
#include <QDateTime>  //日期时间类QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACEclass Widget : public QWidget
{Q_OBJECTpublic:Widget(QWidget *parent = nullptr);~Widget();//声明定时器事件处理函数void timerEvent(QTimerEvent *e)override;private slots:void on_btn1_clicked();//启动按钮的槽函数void on_btn2_clicked();//结束按钮的槽函数private:Ui::Widget *ui;//定义一个播报员指针QTextToSpeech *speechr;//定义一个定时器指针QTimer *time;//定义一个定时器标识int tid;QPushButton *btn1;QTextEdit *txt1;QPushButton *btn2;QLineEdit *edit1;QLabel *lab1;
};
#endif // WIDGET_H

.cpp

#include "widget.h"
#include "ui_widget.h"Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{ui->setupUi(this);//实例化一个标签,设置为当前时间lab1 = new QLabel(" ",this);lab1 -> resize(400,150);//设置大小lab1->move(60,50);lab1->setStyleSheet("background-color:pink");//设置背景颜色lab1->setScaledContents(true);//设置内容自适应//实例化一个文本编辑器，设置为定的时间edit1 = new QLineEdit(this);edit1->setText("请输入>>>");    //设置编辑器中的文本内容edit1->setPlaceholderText("");   //设置编辑器的占位文本edit1->resize(250,75);      //设置尺寸edit1->move(lab1->x()+450,50);//移动位置edit1->setStyleSheet("background-color:pink");edit1->setEnabled(true);   //设置不可用状态4//实例化一个按钮，用作启动时间btn1 = new QPushButton(this);  //将当前界面设置成父组件btn1->setText("启动");btn1->resize(120,70);    //设置按钮大小btn1->setStyleSheet("background-color:pink");//设置背景颜色btn1->move(edit1->x(),edit1->y()+85);btn1->setEnabled(true);    //设置是否可用//实例化一个按钮，用作结束时间btn2 = new QPushButton(this);  //将当前界面设置成父组件btn2->setText("停止");btn2->resize(120,70);    //设置按钮大小btn2->setStyleSheet("background-color:pink");//设置背景颜色btn2->move(btn1->x()+130,btn1->y());btn2->setEnabled(true);    //设置是否可用//实例化一个文本编辑器，播报当定的时间与当前时间相同时的内容txt1 = new QTextEdit(this);txt1->setText("易烊千玺来叫你起床啦！！！");txt1->resize(700,300);txt1->setStyleSheet("background-color:pink");//设置背景颜色txt1->move(60,lab1->y()+200);//给播报员实例化一个空间speechr = new QTextToSpeech(this);//启动定时器tid = this->startTimer(0);  //每隔0秒调用timerEvent函数connect(btn1,&QPushButton::clicked,this,&Widget::on_btn1_clicked);   //启动按钮连接槽函数connect(btn2,&QPushButton::clicked,this,&Widget::on_btn2_clicked);   //启动按钮连接槽函数
}Widget::~Widget()
{delete ui;
}
//定时器闹钟启动按钮
void Widget::on_btn1_clicked()
{//启动按钮禁用this->btn1->setEnabled(false);//将文本编辑器禁用this->txt1->setEnabled(false);//关闭按钮开启this->btn2->setEnabled(true);
}
//定时器闹钟关闭按钮
void Widget::on_btn2_clicked()
{//启动按钮开启this->btn2->setEnabled(false);//将文本编辑器禁用this->txt1->setEnabled(true);//关闭按钮关闭this->btn1->setEnabled(true);
}
//定时器事件处理函数
void Widget::timerEvent(QTimerEvent *e)
{QDateTime sys_time = QDateTime::currentDateTime();  //获取系统当前的日期时间this->lab1->setText(sys_time.toString("yyyy-MM-dd-hh:mm:ss"));//将时间展示到lab1界面QString t = sys_time.toString("hh:mm:ss");this->lab1->setAlignment(Qt::AlignHCenter | Qt::AlignVCenter);//设置lab1中的内容居中显示if(t == this->edit1->text() && this->btn1->isEnabled()== false){speechr->say(this->txt1->toPlainText());}else if(this->btn1->isEnabled()== true){speechr->stop();}
}

二、使用绘制事件完成钟表的实现

QT       += core guigreaterThan(QT_MAJOR_VERSION, 4): QT += widgetsCONFIG += c++11# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0SOURCES += \main.cpp \widget.cppHEADERS += \widget.hFORMS += \widget.ui# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

.h

#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>
#include<QPaintEvent>
#include<QTimer>
#include<QPainter>
#include<QPen>
#include<QBrush>
#include<QTime>
#include<QDebug>QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACEclass Widget : public QWidget
{Q_OBJECTpublic:Widget(int width, int height,QWidget *parent = nullptr);~Widget();void paintEvent(QPaintEvent *event);private:Ui::Widget *ui;QTimer *timer;int count = 0;int hour;int minute ;int second ;
};
#endif // WIDGET_H

main.cpp

#include "widget.h"#include <QApplication>int main(int argc, char *argv[])
{QApplication a(argc, argv);Widget w(860, 640);w.show();return a.exec();
}

widget.cpp

#include "widget.h"
#include "ui_widget.h"Widget::Widget(int width, int height,QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{ui->setupUi(this);this->setFixedSize(width, height);timer = new QTimer;timer->start(1000);connect(timer, &QTimer::timeout, [&](){count++;update();});//获取系统时间QString t = QTime::currentTime().toString("h:m:s ap");//qDebug()<<t<<"   "<<t[0]<<" "<<t[2];QStringList list1 = t.split(" ");
//    for(int i=0; i<list1.size(); i++)
//    {
//        qDebug()<<list1.at(i);
//    }QStringList list2 = list1[0].split(":");for(int i=0; i<list2.size(); i++){qDebug()<<list2.at(i);}hour = list2[0].toUInt();minute = list2[1].toUInt();second = list2[2].toUInt();qDebug()<<"hour:"<<hour<<" minute:"<<minute<<"  second:"<<second;}Widget::~Widget()
{delete ui;
}void Widget::paintEvent(QPaintEvent *event)
{//定义画家类绘制圆QPainter p(this);QPen pen(QColor("purple"));pen.setWidth(3);QBrush b("pink");p.setPen(pen);p.setBrush(b);p.translate(this->width()/2,this->height()/2);p.drawEllipse(QPoint(0,0), 200,200);//使用画家类绘制刻度pen.setColor(QColor("black"));p.setPen(pen);for(int i=0; i<60; i++){p.rotate(6);p.drawLine(QPoint(200,0), QPoint(195,0));}pen.setWidth(5);p.setPen(pen);for(int i=0; i<12; i++){p.drawLine(QPoint(200,0), QPoint(190,0));p.rotate(30);p.drawText(QPoint(0, -170),QString("%1").arg(i+1));}//制作时针pen.setWidth(10);pen.setColor(QColor("red"));p.setPen(pen);p.rotate(hour*30+6*second/60/12+30*minute/60+6*count/60/12);       //6*count/60/12+p.drawLine(QPoint(0,-50), QPoint(0, 5));//制作分针QPainter p1(this);p1.translate(this->width()/2,this->height()/2);pen.setWidth(6);pen.setColor(QColor("blue"));p1.setPen(pen);p1.rotate(6*count/60+minute*6+6*second/60);p1.drawLine(QPoint(0,-80), QPoint(0, 8));//制作秒针QPainter p2(this);p2.translate(this->width()/2,this->height()/2);pen.setWidth(3);pen.setColor(QColor("green"));p2.setPen(pen);p2.rotate(6*count+second*6);p2.drawLine(QPoint(0,-120), QPoint(0, 12));
}