Qt事件处理机制

用qt实现简单闹钟

widget.h

#ifndef WIDGET_H
#define WIDGET_H
#include<QPushButton>
#include<QTextEdit>
#include<QLabel>
#include <QWidget>
#include<QMouseEvent>
#include<QPoint>
#include<QTime>
#include<QTimer>
#include<QFont>
#include<QLineEdit>
#include<QTextToSpeech>
QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACEclass Widget : public QWidget
{Q_OBJECT
signals:void voice();
public:Widget(QWidget *parent = nullptr);~Widget();
public slots:void time_slot();void btn1_slot();void btn2_slot();void voice_slot();
private:Ui::Widget *ui;QLabel *lab1;QPushButton *btn1;QPushButton *btn2;QTextEdit *edit1;QLineEdit *ledit;QTimer t1;QFont font;QTextToSpeech *speecher;};
#endif // WIDGET_H

widget.cpp

#include "widget.h"
#include "ui_widget.h"
#include<QDebug>
Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{ui->setupUi(this);lab1=new QLabel(this);ledit=new QLineEdit(this);btn1=new QPushButton(this);btn2=new QPushButton(this);edit1=new QTextEdit(this);btn2->setEnabled(false);speecher= new QTextToSpeech(this);QTime systime=QTime::currentTime();QString tm=systime.toString("hh:mm:ss");this->lab1->setText(tm);t1.start(1000);connect(&t1,&QTimer::timeout,this,&Widget::time_slot);connect(btn1,&QPushButton::clicked,this,&Widget::btn1_slot);connect(btn2,&QPushButton::clicked,this,&Widget::btn2_slot);connect(this,&Widget::voice,this,&Widget::voice_slot);
}Widget::~Widget()
{delete ui;
}
void Widget::time_slot(){lab1->move(80,30);lab1->resize(200,50);font.setPointSize(20);QTime systime=QTime::currentTime();QString tm=systime.toString("hh:mm:ss");this->lab1->setText(tm);lab1->setFont(font);lab1->setAlignment(Qt::AlignCenter);ledit->move(lab1->width()+lab1->x()+30,30);ledit->resize(300,40);ledit->setPlaceholderText("请输入xx时xx分xx秒");btn1->move(ledit->x(),ledit->y()+ledit->height()+10);btn1->setText("开始");btn1->resize(80,40);btn2->move(btn1->width()+btn1->x()+30,btn1->y());btn2->resize(btn1->size());btn2->setText(("结束"));edit1->move(80,btn1->y()+btn1->height()+10);edit1->resize(600,400);QString tms=lab1->text();QString msg=ledit->text();if(tms==msg){emit voice();}
}
void Widget::voice_slot(){QString msg1=edit1->toPlainText();speecher->say(msg1.toUtf8());}
void Widget::btn1_slot(){btn1->setEnabled(false);edit1->setEnabled(false);ledit->setEnabled(false);btn2->setEnabled(true);
}
void Widget::btn2_slot(){btn1->setEnabled(true);edit1->setEnabled(true);ledit->setEnabled(true);btn2->setEnabled(false);}