QT系列之混合方式UI设计【最常用】

最终效果图：

 

代码:

mainwindow.h

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QMainWindow>

#include<QProgressBar>

#include<QLabel>

#include<QFontComboBox>

#include<QSpinBox>

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 iniSignalSlots();

public:

    MainWindow(QWidget *parent = nullptr);

    ~MainWindow();

private slots:

    void on_actBold_triggered(bool checked);

    void on_acttalic_triggered(bool checked);

    void on_actUnderline_triggered(bool checked);

    void on_textEdit_copyAvailable(bool b);

    void on_textEdit_selectionChanged();

    void on_spinBoxFontSize_valueChanged(int aFontSize);

    void on_comboFont_currentIndexChanged(const QString &arg1);

private:

    Ui::MainWindow *ui;

};

#endif // MAINWINDOW_H

mainwindow.cpp:

#include "mainwindow.h"

#include "ui_mainwindow.h"

void MainWindow::initUI()

{

    fLabCurFile = new QLabel;

    fLabCurFile->setMidLineWidth(150);//最小宽度

    fLabCurFile->setText("当前文件：");

    ui->statusbar->addWidget((fLabCurFile));

    progressBar = new QProgressBar;

    progressBar->setMinimum(5);

    progressBar->setMaximum(50);

    progressBar->setValue(ui->textEdit->font().pointSize());

    ui->statusbar->addWidget(progressBar);

    spinFontSize = new QSpinBox;

    spinFontSize->setMinimum(5);

    spinFontSize->setMaximum(50);

    ui->toolBar->addWidget(new QLabel("字体大小"));

    ui->toolBar->addWidget(spinFontSize);

    comboFont = new QFontComboBox;

    comboFont->setMinimumWidth(5);

    comboFont->setMaximumWidth(50);

    ui->toolBar->addWidget(new QLabel("字体"));

    ui->toolBar->addWidget(comboFont);

}

void MainWindow::iniSignalSlots()

{

    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);

    initUI();

    iniSignalSlots();

    setCentralWidget(ui->textEdit);

}

MainWindow::~MainWindow()

{

    delete ui;

}

void MainWindow::on_actBold_triggered(bool checked)

{

    QTextCharFormat fmt;

    //fmt = ui->textEdit->currentCharFormat();  //可以省略

    if(checked)

        fmt.setFontWeight(QFont::Bold);

     else

        fmt.setFontWeight(QFont::Normal);

    ui->textEdit->mergeCurrentCharFormat(fmt);

}

void MainWindow::on_acttalic_triggered(bool checked)

{

    QTextCharFormat fmt;

    //fmt = ui->textEdit->currentCharFormat();  //可以省略

    if(checked)

        fmt.setFontItalic(QFont::StyleItalic);

     else

        fmt.setFontItalic(QFont::Normal);

    ui->textEdit->mergeCurrentCharFormat(fmt);

}

void MainWindow::on_actUnderline_triggered(bool checked)

{

    QTextCharFormat fmt;

    //fmt = ui->textEdit->currentCharFormat();  //可以省略

    if(checked)

        fmt.setFontUnderline(QFont::UnderlineResolved);

     else

        fmt.setFontItalic(QFont::Normal);

    ui->textEdit->mergeCurrentCharFormat(fmt);

}

//当选中文本时，才可以复制 剪切动作

void MainWindow::on_textEdit_copyAvailable(bool b)

{

    ui->actcut->setEnabled(b);

    ui->actcopy->setEnabled(b);

    ui->actpaste->setEnabled(ui->textEdit->canPaste());

}

//当选中文本时，可以看到文字的状态，是否加粗 是否倾斜  是否具有下划线

void MainWindow::on_textEdit_selectionChanged()

{

    QTextCharFormat fmt;

    fmt=ui->textEdit->currentCharFormat();

    ui->acttalic->setChecked(fmt.fontItalic());

    ui->actBold->setChecked(fmt.font().bold());

    ui->actUnderline->setChecked(fmt.fontUnderline());

}

void MainWindow::on_spinBoxFontSize_valueChanged(int aFontSize)

{

    QTextCharFormat fmt;

    fmt.setFontPointSize(aFontSize);//选中的文字设置

    ui->textEdit->mergeCurrentCharFormat(fmt);  //融合

    progressBar ->setValue(aFontSize);

}

void MainWindow::on_comboFont_currentIndexChanged(const QString &arg1)

{

   QTextCharFormat fmt;

   fmt.setFontFamily(arg1);

   ui->textEdit->mergeCurrentCharFormat(fmt);

}