#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
//1.Combo Box控件
#include<QComboBox>
//2.QFontComboBox控件
#include<QFontComboBox>
#include<QLabel>

//3.Line Edit控件
#include<QLineEdit>
#include <QPushButton>

//4. Plain Text Edit控件
#include <QPlainTextEdit>
#include<QRadioButton>

QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

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

private:
    Ui::MainWindow *ui;
    //1.声明一个QComboBox对象
    QComboBox *combobox;


private slots:
    void comboxIndex(int);


    //2.声明QFontComboBox对象
private:

    QFontComboBox *fontcombobox;
    QLabel *qlabels;
private slots:
    void fontcomboboxFunc(QFont);

    //3.声明QLineEdit/QPushButton/QLabel对象
private:

    QLineEdit *lineedit;
    QPushButton *pushbutton;
    QLabel *qlabely;
private slots:
    void pushbuttonclicked();

    //4.QPlainTextEdit/QRadioButton对象
private:

    QPlainTextEdit *plaintedit;
    QRadioButton *radiobutton;
private slots:
    void radioButtonClicked();

};
#endif // MAINWINDOW_H






#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QMessageBox>
#include <QDebug>
#include <QDir>
#include <QTextStream>//文本流


MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    //设置主窗口的显示位置及大小
    this->setGeometry(300,200,1000,600);

    //1.
    combobox  = new QComboBox(this);//实例化对象
    combobox->setGeometry(10,10,200,30);
    combobox->addItem("北京市");
    combobox->addItem("上海市");
    combobox->addItem("天津市");
    combobox->addItem("重庆市");
    combobox->addItem("江西市");
    combobox->addItem("广东市");
    combobox->addItem("香港特别行政区");
    combobox->addItem("澳门特别行政区");

    //信号槽连接函数实现
    connect(combobox,SIGNAL(currentIndexChanged(int)),this,
            SLOT(comboxIndex(int)));

    //2.
    fontcombobox = new QFontComboBox(this);
    qlabels =new QLabel(this);
    fontcombobox->setGeometry(10,50,200,30);
    qlabels->setGeometry(10,80,300,50);

    //信号与槽的链接
    connect(fontcombobox,SIGNAL(currentFontChanged(QFont)),this,SLOT(fontcomboboxFunc(QFont)));

    //3.
    lineedit = new QLineEdit(this);
    lineedit->setGeometry(10,150,200,30);

    pushbutton = new QPushButton(this);
    pushbutton->setGeometry(220,150,100,30);
    pushbutton->setText("点击我");
    qlabely = new QLabel(this);
    qlabely->setGeometry(10,200,400,30);
    qlabely->setText("你输入的内容为多少:");

    connect(pushbutton,SIGNAL(clicked()),this,SLOT(pushbuttonclicked()));


    //4.
    plaintedit = new QPlainTextEdit(this);
    plaintedit->setGeometry(10,240,400,200);

    radiobutton = new QRadioButton(this);
    radiobutton->setGeometry(260,220,200,30);
    radiobutton->setText("只读模式");

    //设置当前程序为工作目录
    QDir::setCurrent(QCoreApplication::applicationDirPath());
    QFile fe("moc_mainwindow.cpp");
    fe.open(QFile::ReadOnly | QFile::Text);

    //加载到文件流

    QTextStream strin(&fe);
    plaintedit->insertPlainText(strin.readAll());
    //
    connect(radiobutton,SIGNAL(clicked()),this,SLOT(radioButtonClicked()));









}

MainWindow::~MainWindow()
{
    delete ui;
}
//1.
void MainWindow::comboxIndex(int index)
{
    QMessageBox mybox(QMessageBox::Question,"信息",combobox->itemText(index),QMessageBox::Yes | QMessageBox::No);
mybox.exec();
}
//2.
void MainWindow::fontcomboboxFunc(QFont font)
{
    qlabels->setFont(font);
    QString qStr = "零声教育QT开发工程师";
    qlabels->setText(qStr);

}
//3.
void MainWindow::pushbuttonclicked()
{
    QString qStr;
    qStr = "你输入的内容为:";
    qStr = qStr+lineedit->text();

    qlabely->setText(qStr);

    lineedit->clear();


}
//4.
void MainWindow::radioButtonClicked()
{
    //
    if(radiobutton->isChecked())
    {
        plaintedit->setReadOnly(true);
    }
    else
    {
        plaintedit->setReadOnly(false);
    }

}