2022-11-15 QT

1.代码的巩固

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

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

    //QPushButton btn1(this);        //在栈区申请一个按钮
                                        //栈区申请的空间，会很快结束

    QPushButton *btn1 = new QPushButton;      //调用无参构造
    btn1->setText("按钮1");             //设置按钮文本
    btn1->setParent(this);            //设置父组件
    btn1->resize(100, 40);             //设置按钮大小
    btn1->setEnabled(false);            //设置按钮不可用状态

    //定义按钮，使用有参构造函数
    QPushButton *btn2 = new QPushButton(this);
    btn2->setText("按钮2");            //设置文本信息
    btn2->resize(btn1->size());        //设置大小为其他按钮的大小
    //btn2->move(0, 40);
    btn2->move(0, btn1->height());     //移动按钮位置，以其他按钮作为标准

    //定义按钮，并初始化文本信息
    QPushButton *btn3 = new QPushButton("按钮3", this);
    btn3->resize(btn1->size());       //设置大小
    btn3->move(btn1->width(), 0);       //移动按钮
    btn3->setIcon(QIcon("D:/22061QT/day2/03Login/icon/cancel.png"));   //设置按钮的图标

    //定义按钮，初始化图标
    QPushButton *btn4 = new QPushButton(QIcon("D:/22061QT/day2/03Login/icon/cancel.png"),
                                        "按钮4",
                                        this);
    btn4->resize(btn1->size());
    btn4->move(btn1->width(), btn1->height());

    //定义一个标签
    QLabel *lab = new QLabel("爱好：", this);
    lab->move(200,200);

}

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

.pro文件
QT       += core gui texttospeech

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += 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 6.0.0

SOURCES += \
    main.cpp \
    widget.cpp

HEADERS += \
    widget.h

FORMS += \
    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
——————————————————————————————————————————————————————————————————————————————————————————————
头文件：
#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include<QPushButton>
#include <QTextToSpeech>     //引入文本转语音的头文件

QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT

public slots:
    void close();            //声明自定义的槽函数

    void read();             //声明阅读函数

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

private:
    Ui::Widget *ui;

    //定义一个按钮
    QPushButton *btn1;

    //定义一个按钮
    QPushButton *btn2;

    //定义按钮3
    QPushButton *btn3;

    //实例化一个播报者
    QTextToSpeech speecher;
};
#endif // WIDGET_H
——————————————————————————————————————————————————————————————————————————————————————————————
源文件
#include "widget.h"
#include "ui_widget.h"

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

    //给按钮申请空间
    btn1 = new QPushButton("按钮1", this);

    //当按钮一旦被按下，就会触发一个clicked的信号，我们可以将该信号，连接到对应的槽函数中，处理相关逻辑
    //通过connect函数进行连接
    //测试qt4版本的连接函数
    connect(btn1, SIGNAL(clicked()), this, SLOT(close()));   //不安全的连接

    //给按钮2申请空间
    btn2 = new QPushButton("按钮2", this);
    btn2->move(btn1->width(), 0);           //移动按钮
    //当按钮一旦被按下，就会触发一个clicked的信号，我们可以将该信号，连接到对应的槽函数中，处理相关逻辑
    //测试qt5版本的连接函数
    connect(btn2, &QPushButton::clicked, this, &Widget::read);  //安全的连接

    //给btn3申请空间
    btn3 = new QPushButton("按钮3", this);
    btn3->move(0, btn1->height());
    //测试使用Larmda表达式作为槽函数
    connect(btn3, &QPushButton::clicked, [&](){
        this->resize(500,400);
    });


}

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

//自定义的槽函数
void Widget::close()
{
    this->close();
}

//自定义阅读的槽函数
void Widget::read()
{
    speecher.say(QString("今天是周二，天气晴，心情不错，又学到新知识了！！！"));
}

2.