创建QDialog工程（纯代码）

纯代码方式更灵活，可以完成很多可视化UI设计无法完成的工作。

包含头文件

创建指针（原件）

初始化原件

修改变量的名称

增加信号和槽函数（增加功能）

#-------------------------------------------------
#
# Project created by QtCreator 2023-10-16T20:47:34
#
#-------------------------------------------------

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = sample2
TEMPLATE = app

# The following define makes your compiler emit warnings if you use
# any feature of Qt which as been marked as 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 you use 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 \
        dialog.cpp

HEADERS += \
        dialog.h

#ifndef DIALOG_H
#define DIALOG_H

#include 

//第二步创建各个原件的类以及指针
//创建原件类
class QCheckBox;
class QRadioButton;
class QPlainTextEdit;
class QPushButton;

class Dialog : public QDialog
{
    Q_OBJECT

    //创建原件指针
private:
    QCheckBox *chkBoxUnder;
    QCheckBox *chkBoxItalic;
    QCheckBox *chkBoxBold;

    QRadioButton *radioBlack;
    QRadioButton *radioRed;
    QRadioButton *radioBlue;

    QPlainTextEdit *txtEdit;

    QPushButton *btnOK;
    QPushButton *btnCancel;
    QPushButton *btnClose;

    //第四步设置槽函数实现功能
private slots:
    void do_chkBoxUnder(bool checked);
    void do_chkBoxItalic(bool checked);
    void do_chkBoxBold(bool checked);
    
    void do_setFontColor();
public:
    Dialog(QWidget *parent = 0);
    ~Dialog();
};

#endif // DIALOG_H

#include "dialog.h"
//第一步添加各个布局原件的头文件
#include    //添加横向布局的头文件
#include    //添加纵向布局的头文件
#include      //添加检测原件的头文件
#include   //添加Radin按钮的头文件
#include //添加文本框的头文件
#include    //添加按钮的头文件

#include 
void Dialog::do_chkBoxUnder(bool checked)
{
    QFont font = txtEdit->font();//获得文本框字体的大小
    font.setUnderline(checked);//设置字体的下划线
    txtEdit->setFont(font);
}

void Dialog::do_chkBoxItalic(bool checked)
{
    QFont font = txtEdit->font();//获得文本框字体的大小
    font.setItalic(checked);//设置字体的斜体
    txtEdit->setFont(font);
}

void Dialog::do_chkBoxBold(bool checked)
{
    QFont font = txtEdit->font();//获得文本框字体的大小
    font.setBold(checked);//设置字体的加粗
    txtEdit->setFont(font);
}

void Dialog::do_setFontColor()
{
    QPalette plet = txtEdit->palette();
    if(radioBlack->isChecked())
        plet.setColor(QPalette::Text,Qt::black);
    if(radioBlue->isChecked())
        plet.setColor(QPalette::Text,Qt::blue);
    if(radioRed->isChecked())
        plet.setColor(QPalette::Text,Qt::red);
    txtEdit->setPalette(plet);
}

Dialog::Dialog(QWidget *parent)
    : QDialog(parent)
{
    //第三步：初始化各个原件
    chkBoxUnder = new QCheckBox("下划线");
    chkBoxItalic = new QCheckBox("斜体");
    chkBoxBold = new QCheckBox("加粗");
    QHBoxLayout *HLay = new QHBoxLayout();//生成一个横向的容器
    HLay->addWidget(chkBoxUnder);
    HLay->addWidget(chkBoxItalic);
    HLay->addWidget(chkBoxBold);

    radioBlack = new QRadioButton("黑色");
    radioRed = new QRadioButton("红色");
    radioBlue = new QRadioButton("蓝色");
    QHBoxLayout *HLay2 = new QHBoxLayout();//生成一个横向的容器
    HLay2->addWidget(radioBlack);
    HLay2->addWidget(radioRed);
    HLay2->addWidget(radioBlue);

    txtEdit = new QPlainTextEdit("Hello world\n 手工创建");
    QFont font = txtEdit->font();//获得文本框字体的大小
    font.setPointSize(20);//设置字体的大小
    txtEdit->setFont(font);

    btnOK = new QPushButton("确定");
    btnCancel = new QPushButton("取消");
    btnClose = new QPushButton("退出");
    QHBoxLayout *HLay3 = new QHBoxLayout();//生成一个横向的容器
    HLay3->addWidget(btnOK);
    HLay3->addWidget(btnCancel);
    HLay3->addWidget(btnClose);

    QVBoxLayout *VLay = new QVBoxLayout();//生成一个纵向的容器
    VLay->addLayout(HLay);
    VLay->addLayout(HLay2);
    VLay->addWidget(txtEdit);
    VLay->addLayout(HLay3);

    //设置整个窗口的布局
    setLayout(VLay);

    //第五步，连接各个原件触发的信号
    connect(chkBoxUnder,SIGNAL(clicked(bool)),this,SLOT(do_chkBoxUnder(bool)));
    connect(chkBoxItalic,SIGNAL(clicked(bool)),this,SLOT(do_chkBoxItalic(bool)));
    connect(chkBoxBold,SIGNAL(clicked(bool)),this,SLOT(do_chkBoxBold(bool)));

    connect(radioBlack,SIGNAL(clicked(bool)),this,SLOT(do_setFontColor()));
    connect(radioRed,SIGNAL(clicked(bool)),this,SLOT(do_setFontColor()));
    connect(radioBlue,SIGNAL(clicked(bool)),this,SLOT(do_setFontColor()));

    connect(btnOK,SIGNAL(clicked()),this,SLOT(accept()));
    connect(btnCancel,SIGNAL(clicked()),this,SLOT(reject()));
    connect(btnClose,SIGNAL(clicked()),this,SLOT(close()));
}

Dialog::~Dialog()
{

}