UI+代码混合开发

UI控件

代码

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QProgressBar>
#include <QLabel>
#include <QSpinBox>
#include <QFontComboBox>

QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT
private:
    QLabel *fLabCurFile;
    QProgressBar *progressBar;
    QSpinBox *spinFontSize;
    QFontComboBox *comboFont;

    void initUI();
    void initSingalSlots(); //需要将自定义的槽和信号绑定在一起

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

private slots:
    void on_actFontBold_triggered(bool checked);

    void on_actFontItalic_triggered(bool checked);

    void on_actFontUnder_triggered(bool checked);

    void on_textEdit_copyAvailable(bool b);

    void on_textEdit_selectionChanged();

    /* 如果是自己写的控件，就要自己命名槽函数 */
    void on_spinBoxFontSize_valueChanged(int aFontSize); //改变字体大小
    void on_comboFont_currentIndexChanged(const QString &arg1); //改变字体,const 表示改变不了原有库的数据

private:
    Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

void MainWindow::initUI()
{
    /* 设置QLabel */
    fLabCurFile = new QLabel();
    fLabCurFile->setMinimumWidth(150); //设置最小宽度
    fLabCurFile->setText("当前文件：");
    ui->statusbar->addWidget(fLabCurFile);

    /* 设置QProgressBar */
    progressBar = new QProgressBar;
    progressBar->setMinimum(5);
    progressBar->setMaximum(50);
    progressBar->setValue(ui->textEdit->font().pointSize());
    ui->statusbar->addWidget(progressBar);

    /* 设置QSpinBox */
    spinFontSize = new QSpinBox;
    spinFontSize->setMinimum(5);
    spinFontSize->setMaximum(50);
    ui->mainToolBar->addWidget(new QLabel("字体大小"));
    ui->mainToolBar->addWidget(spinFontSize);

    /* 设置QComboBox */
    comboFont = new QFontComboBox;
    ui->mainToolBar->addWidget(new QLabel("字体"));
    ui->mainToolBar->addWidget(comboFont);

    setCentralWidget(ui->textEdit); //将中间的文本框中心布局
}

void MainWindow::initSingalSlots()
{
    //检测到值发生变化的时候
    connect(spinFontSize, SIGNAL(valueChanged(int)),
            this, SLOT(on_spinBoxFontSize_valueChanged(int)));
    connect(comboFont, SIGNAL(currentIndexChanged(const QString&)),
            this, SLOT(on_comboFont_currentIndexChanged(const QString&)));
}

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    //写好了调用
    initUI();
    initSingalSlots();
}

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


void MainWindow::on_actFontBold_triggered(bool checked)
{
    QTextCharFormat fmt;
    if(checked)
        fmt.setFontWeight(QFont::Bold);
    else
        fmt.setFontWeight(QFont::Normal);
    ui->textEdit->mergeCurrentCharFormat(fmt);
}

void MainWindow::on_actFontItalic_triggered(bool checked)
{
    QTextCharFormat fmt;
    fmt.setFontItalic(checked);
    ui->textEdit->mergeCurrentCharFormat(fmt);
}

void MainWindow::on_actFontUnder_triggered(bool checked)
{
    QTextCharFormat fmt;
    fmt.setFontUnderline(checked);
    ui->textEdit->mergeCurrentCharFormat(fmt);
}

void MainWindow::on_textEdit_copyAvailable(bool b)
{
    ui->actCut->setEnabled(b); //允许拷贝
    ui->actCopy->setEnabled(b);
    ui->actPaste->setEnabled(ui->textEdit->canPaste());
}

void MainWindow::on_textEdit_selectionChanged()
{
    /* 选中了一段文件，可以看到按钮是不是被选中 */
    QTextCharFormat fmt;
    fmt = ui->textEdit->currentCharFormat(); //获取当前状态
    ui->actFontItalic->setChecked(fmt.fontItalic());
    ui->actFontUnder->setChecked(fmt.fontUnderline());
    ui->actFontBold->setChecked(fmt.font().bold());
}

void MainWindow::on_spinBoxFontSize_valueChanged(int aFontSize)
{
    QTextCharFormat fmt;
    fmt.setFontPointSize(aFontSize);
    ui->textEdit->mergeCurrentCharFormat(fmt);
    progressBar->setValue(aFontSize); //下面的百分比会跟着改变
}

void MainWindow::on_comboFont_currentIndexChanged(const QString &arg1)
{
    QTextCharFormat fmt;
    fmt.setFontFamily(arg1);
    ui->textEdit->mergeCurrentCharFormat(fmt);

}

效果