事件、方法实现 on_radioGreen_clicked ，on_chkBoxUnder

事件、方法实现 on_radioGreen_clicked ，on_chkBoxUnder_clicked，Qfont，QPalette

Vertical Layout 、Horizontal Layout 实验窗体自适应布局

接上篇界面布局，

实验checkBox、radioBox 的事件槽，

使用Qfont组件变更纯文本框QPlainTextEdit中字体的下划线、加粗、斜体效果

使用调色板组QPalette变更纯文本框QPlainTextEdit中文本颜色

UI截图

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include <QMainWindow>QT_BEGIN_NAMESPACE
namespace Ui {
class MainWindow;
}
QT_END_NAMESPACEclass MainWindow : public QMainWindow
{Q_OBJECTpublic:MainWindow(QWidget *parent = nullptr);~MainWindow();private slots:void on_radioBlack_clicked();void on_radioRed_clicked();void on_radioGreen_clicked();void on_chkBoxUnder_clicked(bool checked);void on_chkBoxBold_clicked(bool checked);void on_chkBoxItalic_clicked(bool checked);void setFontColor();void on_bntClear_clicked();void on_btnExit_clicked();private:Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"MainWindow::MainWindow(QWidget *parent): QMainWindow(parent), ui(new Ui::MainWindow)
{ui->setupUi(this);
}MainWindow::~MainWindow()
{delete ui;
}void MainWindow::setFontColor()
{QPalette palette = ui->plainTextEdit->palette();if(ui->radioBlack->isChecked()){palette.setColor(QPalette::Text,Qt::black);}else if(ui->radioGreen->isChecked()){palette.setColor(QPalette::Text,Qt::green);}else if(ui->radioRed->isChecked()){palette.setColor(QPalette::Text,Qt::red);}ui->plainTextEdit->setPalette(palette);
}void MainWindow::on_radioBlack_clicked()
{setFontColor();
}void MainWindow::on_radioRed_clicked()
{setFontColor();
}void MainWindow::on_radioGreen_clicked()
{setFontColor();
}void MainWindow::on_chkBoxUnder_clicked(bool checked)
{QFont font=ui->plainTextEdit->font();font.setUnderline(checked);ui->plainTextEdit->setFont(font);
}void MainWindow::on_chkBoxBold_clicked(bool checked)
{QFont font=ui->plainTextEdit->font();font.setBold(checked);ui->plainTextEdit->setFont(font);
}void MainWindow::on_chkBoxItalic_clicked(bool checked)
{QFont font=ui->plainTextEdit->font();font.setItalic(checked);ui->plainTextEdit->setFont(font);
}void MainWindow::on_bntClear_clicked()
{ui->plainTextEdit->clear();
}void MainWindow::on_btnExit_clicked()
{this->close();
}