创建QDialog工程

换掉图标

添加一个组件



水平布局




所有原件横向布局完成后，选中外框，点击Dialog,进行纵向布局

调整文本字体的大小





清空按钮的槽函数

下划线的槽函数

斜体的槽函数



加粗的槽函数



或者使用快剪辑：Alt+Enter。然后点击,“添加定义”

#-------------------------------------------------
#
# Project created by QtCreator 2023-10-15T21:31:19
#
#-------------------------------------------------QT       += core guigreaterThan(QT_MAJOR_VERSION, 4): QT += widgetsTARGET = Demo1
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 6.0.0SOURCES += \main.cpp \dialog.cppHEADERS += \dialog.hFORMS += \dialog.uiRESOURCES += \pic.qrc

#ifndef DIALOG_H
#define DIALOG_H#include <QDialog>namespace Ui {
class Dialog;
}class Dialog : public QDialog
{Q_OBJECTpublic:explicit Dialog(QWidget *parent = 0);~Dialog();private slots:void on_pushButton_Clear_clicked();void on_checkBox_unline_clicked(bool checked);void on_checkBox_italic_clicked(bool checked);void on_checkBox_bold_clicked(bool checked);void do_FontColor();private:Ui::Dialog *ui;
};#endif // DIALOG_H

#include "dialog.h"
#include "ui_dialog.h"Dialog::Dialog(QWidget *parent) :QDialog(parent),ui(new Ui::Dialog)
{ui->setupUi(this);connect(ui->radioButton_black, SIGNAL(clicked()), this, SLOT(do_FontColor()));connect(ui->radioButton_blue, SIGNAL(clicked()), this, SLOT(do_FontColor()));connect(ui->radioButton_red, SIGNAL(clicked()), this, SLOT(do_FontColor()));
}Dialog::~Dialog()
{delete ui;
}void Dialog::on_pushButton_Clear_clicked()
{ui->plainTextEdit->clear();//清空文本框
}void Dialog::on_checkBox_unline_clicked(bool checked)
{QFont font = ui->plainTextEdit->font();//创建对象，并初始化为文本框字体型号font.setUnderline(checked);//如果下划线被选中ui->plainTextEdit->setFont(font);//则设置下划线
}void Dialog::on_checkBox_italic_clicked(bool checked)
{QFont font = ui->plainTextEdit->font();//创建对象，并初始化为文本框字体型号font.setItalic(checked);//如果斜体被选中ui->plainTextEdit->setFont(font);//则设置斜体
}void Dialog::on_checkBox_bold_clicked(bool checked)
{QFont font = ui->plainTextEdit->font();//创建对象，并初始化为文本框字体型号font.setBold(checked);//如果加粗被选中ui->plainTextEdit->setFont(font);//则设置加粗
}void Dialog::do_FontColor()
{QPalette plet = ui->plainTextEdit->palette();//创建对象，并初始化为文本框字体颜色（获取颜色）if(ui->radioButton_black->isChecked())  //判断黑色按钮是否被选中plet.setColor(QPalette::Text,Qt::black);//如果选中了，设置为黑色if(ui->radioButton_blue->isChecked())  //判断蓝色按钮是否被选中plet.setColor(QPalette::Text,Qt::blue);//如果选中了，设置为蓝色if(ui->radioButton_red->isChecked())  //判断红色按钮是否被选中plet.setColor(QPalette::Text,Qt::red);//如果选中了，设置为红色ui->plainTextEdit->setPalette(plet);//设置文本框的颜色
}

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