Qt5——主窗口

文章目录

  • Qt5 主窗口构成
    • 基本元素
    • 示例:文本编辑器
      • 示例步骤及代码
      • 显示结果
  • Qt5 文件操作功能
    • 新建文件
    • 打开文件
    • 打印文件
  • Qt5 图像坐标变换
    • 缩放功能
    • 旋转功能
  • Qt5 文本编辑功能
    • 实现文本编辑的具体步骤:
  • Qt5 排版功能
  • 最终实现效果及全部代码
    • 全部代码
    • 界面效果


Qt5 主窗口构成

基本元素

QMainWindow是一个为用户提供主窗口程序的类,包含一个菜单栏(menu bar)、多个工具栏(tool bars)、多个锚接部件(dock widgets)及一个中心部件(central widget),是许多应用程序的基础,如文本编辑器、图片编辑器等。
接下来将详细介绍关于这些的基本元素

  • 菜单栏
    菜单是一系列命令的列表。为了实现菜单、工具栏按钮、键盘快捷方式等命令的一致性,Qt使用动作(Action)来表示这些命令。Qt的菜单就是由一系列的QAction动作对象构成的列表,而菜单栏则是包容菜单的面板,它位于主窗口顶部、主窗口标题栏的下面。一个主窗口最多只有一个菜单栏。

  • 状态栏
    状态栏通常显示GUI应用程序的一些状态信息,它位于主窗口的底部。用户可以在状态栏上添加、使用Qt窗口部件。一个主窗口最多只能有一个状态栏。

  • 工具栏
    工具栏是由一系列的类似于按钮的动作排列而成的面板,它通常由一些经常使用的命令(动作)组成。工具栏位于菜单栏的下面、状态栏的上面,可以停靠在主窗口的上、下、左、右四个方向上。一个主窗口可以包含多个工具栏。

  • 锚接部件
    锚接部件作为一个容器使用,以包容其他窗口部件来实现某些功能。例如:Qt设计器的属性编辑器、对象监视器等都是由锚接部件包容其他的Qt窗口部件来实现的。它位于工具栏区的内部,可以作为一个窗口自由浮动在主窗口上面,也可以像工具栏一样停靠在主窗口的上、下、左、右四个方向上。一个主窗口可以包含多个锚接部件。

  • 中心部件
    中心部件处于锚接部件区的内部、主窗口的中心。一个主窗口只有一个中心部件。

    • 注:主窗口QMainWindow具有自己的布局管理器,因此在QMainWindow窗口上设置布局管理器或者创建一个父窗口部件作为QMainWindow的布局管理器都是不允许的。但可以在主窗口的中心部件上设置管理器。

示例:文本编辑器

接下来通过完成一个文本编辑器应用实例,来介绍关于QMainWindow主窗体的创建流程核各种功能的开发。

首先,极少文件操作功能,包括新建一个文件,理由标准文件对话框QFileDialog类打开一个已存在的文件,利用QFile和QTextStream读取文件内容,打印文件(分文本打印和图像打印)。通过示例介绍标准打印对话框QPrintDialog类的使用方法,以QPrinter作为QPaintDevice画图实现图像打印。

接着,介绍图像处理软件中的常用功能,包括图片的缩放、旋转及镜像等坐标变换,使用QMatrix实现图像的各种坐标变换。

然后,开发文本编辑功能,通过在工具栏上设置文字字体、字号大小、加粗、斜体、下划线及字体颜色等快捷按钮的实现,介绍了在工具栏中嵌入控件的方法。其中,通过设置字体颜色功能,介绍了标准颜色对话框QColorDialog类的使用方法。

最后是排版功能,通过选择某种排序方式实现对文本排序,以及实现文本对齐(包括左对齐、右对齐、居中对齐和两端对齐)和撤销、重做的方法。

示例步骤及代码

首先简历项目的框架代码:

  • 新建Qt Widgets Application项目,项目名称为“ImageProcessor”,基类选择“QMainWindow”,类名命名为“ImgProcessor”,取消“创建界面”复选框的选中状态。完成项目工程的建立。
  • 添加工程的提供主要显示文本编辑框函数所在的文件,点击右键添加新文件,选择“C++Class”选项,选择基类名“QWidget”,类命名为“ShowWidget”,在源文件和头文件添加以下代码:
  • showwidget.h
#ifndef SHOWWIDGET_H
#define SHOWWIDGET_H

#include 
#include 
#include 
#include 

class ShowWidget : public QWidget
{
    Q_OBJECT
public:
    explicit ShowWidget(QWidget *parent = nullptr);

    QImage img;
    QLabel *imageLabel;
    QTextEdit *text;

signals:
public slots:

};

#endif // SHOWWIDGET_H

  • showwidget.cpp
#include "showwidget.h"
#include

ShowWidget::ShowWidget(QWidget *parent) : QWidget(parent)
{
    imageLabel = new QLabel;
    imageLabel->setScaledContents(true);
    text = new QTextEdit;
    QHBoxLayout *mainLayout = new QHBoxLayout(this);
    mainLayout->addWidget(imageLabel);
    mainLayout->addWidget(text);
}

  • 主函数 ImgProcessor 类声明中,createActions() 函数用于创建所有的动作,createMenus() 函数用于创建菜单、createToolBars() 函数用于创建工具栏;接着声明实现主窗口所需的各个元素,包括菜单、工具栏及各个动作等;最后声明用到的槽函数,打开“imgprocessor.h”文件,添加以下代码:
#ifndef IMGPROCESSOR_H
#define IMGPROCESSOR_H

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include "showwidget.h"

class ImgProcessor : public QMainWindow
{
    Q_OBJECT

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

    void createActions();
    void createMenus();
    void createToolBars();
    void loadFile(QString filename);
    void mergeFormat(QTextCharFormat);

private:
    QMenu *fileMenu;
    QMenu *zoomMenu;
    QMenu *rotateMenu;
    QMenu *mirrorMenu;
    QImage img;
    QString fileName;

    ShowWidget *showWidget; //文件菜单项
    QAction *openFileAction;
    QAction *NewFileAction;
    QAction *printTRextAction;
    QAction *printImageAction;
    QAction *exitAction;
    QAction *copyAction;    //编辑菜单项
    QAction *cutAction;
    QAction *pasteAction;
    QAction *aboutAction;
    QAction *zoomInAction;
    QAction *zoomOutAction;
    QAction *rotate90Action;    //旋转菜单项
    QAction *rotate180Action;
    QAction *rotate270Action;
    QAction *mirrorVerticalAction;  //镜像菜单项
    QAction *mirrorHorizontalAction;
    QAction *undoAction;
    QAction *redoAction;
    QToolBar *fileTool; //工具栏
    QToolBar *zoomTool;
    QToolBar *rotateTool;
    QToolBar *mirrorTool;
    QToolBar *doToolBar;
};
#endif // IMGPROCESSOR_H

  • 下面是主窗口的部分代码:
#include "imgprocessor.h"

ImgProcessor::ImgProcessor(QWidget *parent)
    : QMainWindow(parent)
{
    setWindowTitle(tr("Easy Word"));    //窗口标题

    showWidget = new ShowWidget(this);
    setCentralWidget(showWidget);

    //创建动作、菜单、工具栏
    createActions();
    createMenus();
    createToolBars();

    if(img.load("mage.png"))
    {
        //在imagelabel中放置图像
        showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));
    }
}

ImgProcessor::~ImgProcessor()
{
}

void ImgProcessor::createActions()
{
    //“打开”动作
    openFileAction = new QAction(QIcon("open.png"), tr("打开"), this);
    openFileAction->setShortcut(tr("Ctrl+O"));	//设置此动作的组合键
    openFileAction->setStatusTip(tr("打开一个文件"));//设定状态栏显示。

    //“新建”动作
    NewFileAction = new QAction(QIcon("new.png"), tr("新建"), this);
    NewFileAction->setShortcut(tr("Ctrl+N"));
    NewFileAction->setStatusTip(tr("新建一个文件"));

    //“退出”动作
    exitAction = new QAction(tr("退出"), this);
    exitAction->setShortcut(tr("Ctrl+Q"));
    exitAction->setStatusTip(tr("退出程序"));
    connect(exitAction, SIGNAL(triggered()), this, SLOT(close()));

    //“复制”动作
    copyAction = new QAction(QIcon("copy.png"), tr("复制"), this);
    copyAction->setShortcut(tr("Ctrl+C"));
    copyAction->setStatusTip(tr("复制文件"));
    connect(copyAction, SIGNAL(triggered()), showWidget->text, SLOT(copy()));

    //“剪切”动作
    cutAction = new QAction(QIcon("cut.png"), tr("剪切"), this);
    cutAction->setShortcut(tr("Ctrl+X"));
    cutAction->setStatusTip(tr("剪切文件"));
    connect(cutAction, SIGNAL(truggered()), showWidget->text, SLOT(cut()));

    //“粘贴”动作
    pasteAction = new QAction(QIcon("paste.png"), tr("粘贴"), this);
    pasteAction->setShortcut(tr("Ctrl+V"));
    pasteAction->setStatusTip(tr("粘贴文件"));
    connect(pasteAction, SIGNAL(triggered()), showWidget->text, SLOT(paste()));

    //“关于”动作
    aboutAction = new QAction(tr("关于"), this);
    connect(aboutAction, SIGNAL(triggered()), this, SLOT(QApplication::aboutQt()));

    //“打印文本”动作
    printTRextAction = new QAction(QIcon("printText.png"), tr("打印文本"), this);
    printTRextAction->setStatusTip(tr("打印一个文本"));


    //“打印图像”动作
    printImageAction = new QAction(QIcon("printImage.png"), tr("打印图像"), this);
    printImageAction->setStatusTip(tr("打印一幅图像"));

    //“放大”动作
    zoomInAction = new QAction(QIcon("zoomin.png"), tr("放大"), this);
    zoomInAction->setStatusTip(tr("放大一张照片"));

    //“缩小”动作
    zoomOutAction = new QAction(QIcon("zoomout.png"), tr("缩小"), this);
    zoomOutAction->setStatusTip(tr("缩小一张照片"));

    //实现图像旋转的动作
    //90
    rotate90Action = new QAction(QIcon("rotate90.png"), tr("旋转90"), this);
    rotate90Action->setStatusTip(tr("将一幅图像旋转90度"));
    //180
    rotate180Action = new QAction(QIcon("rotate180.png"), tr("旋转180"), this);
    rotate180Action->setStatusTip(tr("将一幅图像旋转180度"));
    //270
    rotate270Action = new QAction(QIcon("rotate270.png"), tr("旋转270"), this);
    rotate270Action->setStatusTip(tr("将一副图像旋转270度"));

    //实现图像镜像的动作
    //纵向
    mirrorVerticalAction = new QAction(QIcon("mirrorV.png"), tr("纵向镜像"), this);
    mirrorVerticalAction->setStatusTip(tr("对一幅图像纵向镜像"));

    //横向
    mirrorHorizontalAction = new QAction(QIcon("mirrorH.png"), tr("横向镜像"), this);
    mirrorHorizontalAction->setStatusTip(tr("对一副图像横向镜像"));

    //实现撤销和恢复动作
    undoAction = new QAction(QIcon("undo.png"), tr("撤销"), this);
    connect(undoAction, SIGNAL(triggered()), showWidget->text, SLOT(undo()));

    redoAction = new QAction(QIcon("redo.png"), tr("重做"), this);
    connect(redoAction, SIGNAL(triggered()), showWidget->text, SLOT(redo()));
}

void ImgProcessor::createMenus()
{
    //文件菜单
    fileMenu = menuBar()->addMenu(tr("文件"));	//menuBar()得到主窗口的菜单栏指针,调用函数addMenu()插入一个新的菜单。
    fileMenu->addAction(openFileAction);//调用addAction()函数向菜单中加入菜单条目
    fileMenu->addAction(NewFileAction);
    fileMenu->addAction(printTRextAction);
    fileMenu->addAction(printImageAction);
    fileMenu->addSeparator();//插入空格
    fileMenu->addAction(exitAction);

    //缩放菜单
    zoomMenu = menuBar()->addMenu(tr("编辑"));
    zoomMenu->addAction(copyAction);
    zoomMenu->addAction(cutAction);
    zoomMenu->addAction(pasteAction);
    zoomMenu->addAction(aboutAction);
    zoomMenu->addSeparator();
    zoomMenu->addAction(zoomInAction);
    zoomMenu->addAction(zoomOutAction);


    //旋转菜单
    rotateMenu = menuBar()->addMenu(tr("旋转"));
    rotateMenu->addAction(rotate90Action);
    rotateMenu->addAction(rotate180Action);
    rotateMenu->addAction(rotate270Action);

    //镜像菜单
    mirrorMenu = menuBar()->addMenu(tr("镜像"));
    mirrorMenu->addAction(mirrorVerticalAction);
    mirrorMenu->addAction(mirrorHorizontalAction);
}


void ImgProcessor::createToolBars()
{
    //文件工具条
    fileTool = addToolBar("File");	//QMainWindow直接调用addToolBar()函数获得主窗口的工具条对象。
    fileTool->addAction(openFileAction);//向工具条查出属于该工具条的工作。
    fileTool->addAction(NewFileAction);
    fileTool->addAction(printTRextAction);
    fileTool->addAction(printImageAction);

    //编辑工具条
    zoomTool = addToolBar("Edit");
    zoomTool->addAction(copyAction);
    zoomTool->addAction(cutAction);
    zoomTool->addAction(pasteAction);
    zoomTool->addSeparator();
    zoomTool->addAction(zoomInAction);
    zoomTool->addAction(zoomOutAction);

    //旋转工具条
    rotateTool = addToolBar("rotate");
    rotateTool->addAction(rotate90Action);
    rotateTool->addAction(rotate180Action);
    rotateTool->addAction(rotate270Action);

    //撤销和重做工具条
    doToolBar = addToolBar("doEdit");
    doToolBar->addAction(undoAction);
    doToolBar->addAction(redoAction);
}

显示结果

Qt5——主窗口_第1张图片

Qt5 文件操作功能

新建文件

实现新建空白文件的功能,步骤如下:

  • 打开“imgprocessor.h”头文件,添加槽函数及实现如下:
private slots:
    void showNewFile();//新建文件
void ImgProcessor::createActions()
{
    //“新建”动作
    NewFileAction = new QAction(QIcon("new.png"), tr("新建"), this);
    NewFileAction->setShortcut(tr("Ctrl+N"));
    NewFileAction->setStatusTip(tr("新建一个文件"));
    connect(NewFileAction, SIGNAL(triggered()), this, SLOT(showNewFile()));
}

void ImgProcessor::showNewFile()
{
    ImgProcessor *newImgProcessor = new ImgProcessor;
    newImgProcessor->show();
}

打开文件

打开功能是读取一个已经存在的文件,将文件内容显示在窗口中。
在头文件和源文件中添加对应的槽函数及实现:

    void showOpenFile();//打开文件
void ImgProcessor::createActions()
{
    //“打开”动作
    openFileAction = new QAction(QIcon("open.png"), tr("打开"), this);
    openFileAction->setShortcut(tr("Ctrl+O"));
    openFileAction->setStatusTip(tr("打开一个文件"));
    connect(openFileAction, SIGNAL(triggered()), this, SLOT(showOpenFile()));void ImgProcessor::loadFile(QString filename)
{
    qDebug() << "file name :" << filename;
    QFile file(filename);
    if(file.open(QIODevice::ReadOnly | QIODevice::Text))
    {
        QTextStream textStream(&file);
        while(!textStream.atEnd())
        {
            showWidget->text->append(textStream.readLine());
            qDebug() << "read line";
        }
    }
}

void ImgProcessor::showOpenFile()
{
    fileName = QFileDialog::getOpenFileName(this);
    if(!fileName.isEmpty())
    {
        if(showWidget->text->document()->isEmpty())
        {
            loadFile(fileName);
        }
        else
        {
            ImgProcessor *newImgProcessor = new ImgProcessor;
            newImgProcessor->show();
            newImgProcessor->loadFile(fileName);
        }
    }
}

打印文件

打印的文件分为文本和图片两种格式,下面分别介绍。

  • 文本打印
    使用Qt提供的标准打印对话框,QPrintDialog。具体如下:
    void showPrintText();//打印文本文件
    connect(printTRextAction, SIGNAL(triggered()), this, SLOT(showPrintText()));

void ImgProcessor::showPrintText()
{
    QPrinter printer;
    QPrintDialog printDialog(&printer, this);//创建一个QPrintDialog对象。
    if(printDialog.exec())
    {
        //获得QTextEdit 对象的文档
        QTextDocument *doc = showWidget->text->document();
        doc->print(&printer);
    }
}

  • 图像打印
    添加槽函数。
    void showPrintImage();//打印图片

    connect(printImageAction, SIGNAL(triggered()), this, SLOT(showPrintImage()));

void ImgProcessor::showPrintImage()
{
    QPrinter printer;
    QPrintDialog printDialog(&printer, this);
    if(printDialog.exec())
    {
        QPainter painter(&printer);
        QRect rect = painter.viewport();//获得QPainter 对象的视图矩形区域
        QSize size = img.size();
        //安装图片的比例大小重新设定视图矩形区域
        size.scale(rect.size(), Qt::KeepAspectRatio);
        painter.setViewport(rect.x(), rect.y(), size.width(), size.height());
        painter.setWindow(img.rect());
        painter.drawImage(0, 0, img);

    }
}

Qt5 图像坐标变换

QMatrix类提供了世界坐标系统的二维转换功能,可以使窗体转换变形,经常在绘图程序中使用,还可以实现坐标系统的移动、缩放、变形及旋转功能。

setScaledContents 用来设置该控件的scaledContents属性,确定是否根据其大小自动调节内容大小,以便内容充满整个有效区域。若设置值为true,则当现实图片时,控件会根据其大小对图片进行调节。该属性默认值为false,另外,可以通过hasScaledContents() 来获取该属性的值。

缩放功能

下面将实现缩放功能。


    void showZoomIn();//放大
    void showZoomOut();//缩小

void ImgProcessor::showZoomIn()
{
    if(img.isNull())//有效判断
    {
        return;
    }
    QMatrix martix;//声明一个QMatrix类的实例
    martix.scale(2, 2); //该参数决定x方向和y方向的缩放比例
    img = img.transformed(martix);
    showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));
}

void ImgProcessor::showZoomOut()
{
    if(img.isNull())
    {
        return ;
    }
    QMatrix matrix;
    matrix.scale(0.5, 0.5);
    img = img.transformed(matrix);
    showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));
}

旋转功能

    void showRotate90(); //旋转90
    void showRotate180();
    void showRotate270();

    //实现图像旋转的动作
    //90
    rotate90Action = new QAction(QIcon("rotate90.png"), tr("旋转90"), this);
    rotate90Action->setStatusTip(tr("将一幅图像旋转90度"));
    connect(rotate90Action, SIGNAL(triggered()), this, SLOT(showRotate90()));
    //180
    rotate180Action = new QAction(QIcon("rotate180.png"), tr("旋转180"), this);
    rotate180Action->setStatusTip(tr("将一幅图像旋转180度"));
    connect(rotate180Action, SIGNAL(triggered()), this, SLOT(showRotate180()));
    //270
    rotate270Action = new QAction(QIcon("rotate270.png"), tr("旋转270"), this);
    rotate270Action->setStatusTip(tr("将一副图像旋转270度"));
    connect(rotate270Action, SIGNAL(triggered()), this, SLOT(showRotate270()));



void ImgProcessor::showRotate90()
{
    if(img.isNull())
    {
        return ;
    }
    QMatrix matrix;
    matrix.rotate(90);
    img = img.transformed(matrix);
    showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));
}

void ImgProcessor::showRotate180()
{
    if(img.isNull())
    {
        return ;
    }
    QMatrix matrix;
    matrix.rotate(180);
    img = img.transformed(matrix);
    showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));
}

void ImgProcessor::showRotate270()
{
    if(img.isNull())
    {
        return ;
    }
    QMatrix matrix;
    matrix.rotate(270);
    img = img.transformed(matrix);
    showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));
}

Qt5 文本编辑功能

在编写包含格式设置的文本编辑程序时,经常用到的Qt类有QTextEdit、QTextDocument、QTextBlock、QTextList、QTextFrame、QTextTable、QTextCharFormat、QTextBlockFormat、QTextListFormat、QTextFrameFormat和QTextTableFormat等。

任何一个文本编辑的程序都要用到QTextEdit作为输入文本的容器,在它里面输入可编辑文本由QTextDocument作为载体,而用来表示QTextDocument的元素的QTextBlock、QTextList、QTextFrame等都是QTextDocument的不同表现形式,可以表示为字符串、段落、列表、表格或图片等。

每种元素都有自己的个数,这些格式则是用这些类来实现的。

实现文本编辑的具体步骤:

  • 在“imgprocessor.h”头文件中添加“private”变量:

    QLabel *fontLabel;
    QFontComboBox *fontComboBox;
    QLabel *fontLabel2;
    QComboBox *sizeComboBox;
    QToolButton *boldBtn;
    QToolButton *italicBtn;
    QToolButton *underlineBtn;
    QToolButton *colorBtn;
    QToolBar *fontToolBar;
  • 在“imgprocessor.h”头文件中添加槽函数:

protected slots:
    void ShowFontComboBox(QString comboStr);
    void ShowSizeSpinBox(QString spinValue);
    void ShowBoldBtn();
    void ShowItalicBtn();
    void ShowUnderlineBtn();
    void ShowColorBtn();
    void ShowCurrentFormatChanged(const QTextCharFormat &fmt);

  • 在相对应的构造函数中,添加以下语句:
ImgProcessor::ImgProcessor(QWidget *parent)
    : QMainWindow(parent)
{
    setWindowTitle(tr("Easy Word"));    //窗口标题

    showWidget = new ShowWidget(this);
    setCentralWidget(showWidget);

    //在工具栏上嵌入控件
    //设置字体
    fontLabel = new QLabel(tr("字体:"));
    fontComboBox = new QFontComboBox;
    fontComboBox->setFontFilters(QFontComboBox::ScalableFonts);
    fontLabel2 = new QLabel(tr("字号:"));
    sizeComboBox = new QComboBox;
    QFontDatabase db;
    foreach(int size, db.standardSizes())
        sizeComboBox->addItem(QString::number(size));
    boldBtn = new QToolButton;
    boldBtn->setIcon(QIcon("bold.png"));
    boldBtn->setCheckable(true);
    italicBtn = new QToolButton;
    italicBtn->setIcon(QIcon("italic.png"));
    italicBtn->setCheckable(true);
    underlineBtn = new QToolButton;
    underlineBtn->setIcon(QIcon("under.png"));
    underlineBtn->setCheckable(true);
    colorBtn = new QToolButton;
    colorBtn->setIcon(QIcon("color.png"));
    colorBtn->setCheckable(true);

    //创建动作、菜单、工具栏
    createActions();
    createMenus();
    createToolBars();

    if(img.load("mage.png"))
    {
        //在imagelabel中放置图像
        showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));
    }

    connect(fontComboBox, SIGNAL(activated(QString)), this, SLOT(ShowFontComboBox(QString)));
    connect(sizeComboBox, SIGNAL(activated(QString)), this, SLOT(ShowSizeSpinBox(QString)));
    connect(boldBtn, SIGNAL(clicked()), this, SLOT(ShowBoldBtn()));
    connect(italicBtn, SIGNAL(clicked()), this, SLOT(ShowItalicBtn()));
    connect(underlineBtn, SIGNAL(clicked()), this, SLOT(ShowUnderlineBtn()));
    connect(colorBtn, SIGNAL(clicked()), this, SLOT(ShowColorBtn()));
    connect(showWidget->text, SIGNAL(currentCharFormatChanged(QTextCharFormat &)), this, SLOT(ShowCurrentFormatChanged(const QTextCharFormat &)));

}



void ImgProcessor::ShowFontComboBox(QString comboStr)
{
    //设置字体
    QTextCharFormat fmt;//创建一个QTextCharFormat对象
    fmt.setFontFamily(comboStr);//选择的字体名称设置给QTextCharFormat对象
    mergeFormat(fmt);//将新的格式应用到光标选区内的字符。
}

void ImgProcessor::mergeFormat(QTextCharFormat format)
{
    //设置格式
    QTextCursor cursor = showWidget->text->textCursor();//获得编辑框中的光标

    if(!cursor.hasSelection())
    {
        cursor.select(QTextCursor::WordUnderCursor);
    }
    cursor.mergeCharFormat(format);
    showWidget->text->mergeCurrentCharFormat(format);
}

void ImgProcessor::ShowSizeSpinBox(QString spinValue)
{
    //设置字号
    qDebug() << spinValue << "--" << spinValue.toFloat();
    QTextCharFormat fmt;
    fmt.setFontPointSize(spinValue.toFloat());
    showWidget->text->mergeCurrentCharFormat(fmt);
}

void ImgProcessor::ShowBoldBtn()
{
    //设置选中的字体加粗
    QTextCharFormat fmt;
    fmt.setFontWeight(boldBtn->isChecked() ? QFont::Bold : QFont::Normal);
    showWidget->text->mergeCurrentCharFormat(fmt);
}

void ImgProcessor::ShowItalicBtn()
{
    //设置字体斜体
    QTextCharFormat fmt;
    fmt.setFontItalic(italicBtn->isChecked());
    showWidget->text->mergeCurrentCharFormat(fmt);
}

void ImgProcessor::ShowUnderlineBtn()
{
    //设置文字下划线
    QTextCharFormat fmt;
    fmt.setFontUnderline(underlineBtn->isChecked());
    showWidget->text->mergeCurrentCharFormat(fmt);
}

void ImgProcessor::ShowColorBtn()
{
    //设置颜色
    QColor color = QColorDialog::getColor(Qt::red, this);
    if(color.isValid())
    {
        QTextCharFormat fmt;
        fmt.setForeground(color);
        showWidget->text->mergeCurrentCharFormat(fmt);
    }
}

void ImgProcessor::ShowCurrentFormatChanged(const QTextCharFormat &fmt)
{
    fontComboBox->setCurrentIndex(fontComboBox->findText(fmt.fontFamily()));
    sizeComboBox->setCurrentIndex(sizeComboBox->findText(QString::number(fmt.fontPointSize())));
    boldBtn->setChecked(fmt.font().bold());
    italicBtn->setChecked(fmt.fontItalic());
    underlineBtn->setChecked(fmt.fontUnderline());
}

Qt5 排版功能

    //排版
    void showList(int);
    void showAlignment(QAction *act);
    void showCursorPositionChanged();

    //排版功能
    QLabel *listLabel;
    QComboBox *listComboBox;
    QActionGroup *actGrp;
    QAction *leftAction;
    QAction *rightAction;
    QAction *centerAction;
    QAction *justifyAction;
    QToolBar *listToolBar;



   //排版格式
    listLabel = new QLabel(tr("排序"));
    listComboBox = new QComboBox;
    listComboBox->addItem("Standard");
    listComboBox->addItem("QTextListFormat::ListDisc");
    listComboBox->addItem("QTextListFormat::ListCircle");
    listComboBox->addItem("QTextListFormat::ListSquare");
    listComboBox->addItem("QTextListFormat::ListDecimal");
    listComboBox->addItem("QTextListFormat::ListLowerAlpha");
    listComboBox->addItem("QTextListFormat::ListUpperAlpha");
    listComboBox->addItem("QTextListFormat::ListLowerRoman");
    listComboBox->addItem("QTextListFormat::ListUpperRoman");
    //排版格式
    connect(listComboBox, SIGNAL(activated(int)), this, SLOT(showList(int)));
    connect(showWidget->text->document(), SIGNAL(undoAvailable(bool)), redoAction, SLOT(setEnabled(bool)));
    connect(showWidget->text->document(), SIGNAL(redoAvailable(bool)), redoAction, SLOT(setEnabled(bool)));
    connect(showWidget->text->document(), SIGNAL(cursorPositionChanged()), this, SLOT(showCursorPositionChanged()));

void ImgProcessor::ShowCurrentFormatChanged(const QTextCharFormat &fmt)
{
    fontComboBox->setCurrentIndex(fontComboBox->findText(fmt.fontFamily()));
    sizeComboBox->setCurrentIndex(sizeComboBox->findText(QString::number(fmt.fontPointSize())));
    boldBtn->setChecked(fmt.font().bold());
    italicBtn->setChecked(fmt.fontItalic());
    underlineBtn->setChecked(fmt.fontUnderline());
}

void ImgProcessor::showAlignment(QAction *act)
{
    if(act == leftAction)
    {
        //左对齐
        showWidget->text->setAlignment(Qt::AlignLeft);
    }
    if(act == rightAction)
    {
        //右对齐
        showWidget->text->setAlignment(Qt::AlignRight);
    }
    if(act == centerAction)
    {
        //居中
        showWidget->text->setAlignment(Qt::AlignCenter);
    }
    if(act == justifyAction)
    {
        //两端对齐
        showWidget->text->setAlignment(Qt::AlignJustify);
    }
}

void ImgProcessor::showCursorPositionChanged()
{
    if(showWidget->text->alignment() == Qt::AlignLeft)
        leftAction->setChecked(true);
    if(showWidget->text->alignment() == Qt::AlignRight)
        rightAction->setChecked(true);
    if(showWidget->text->alignment() == Qt::AlignCenter)
        centerAction->setChecked(true);
    if(showWidget->text->alignment() == Qt::AlignJustify)
        justifyAction->setChecked(true);
}

void ImgProcessor::showList(int index)
{
    //获得编辑框的QTextCursor对象指针
    QTextCursor cursor = showWidget->text->textCursor();
    if(index != 0)
    {
        QTextListFormat::Style style = QTextListFormat::ListDisc;//从下拉列表中旋转确定QTextlistformat的style属性值。
        switch (index) {
        default:
        case 1:
            style = QTextListFormat::ListDisc;
            break;
        case 2:
            style = QTextListFormat::ListCircle;
            break;
        case 3:
            style = QTextListFormat::ListSquare;
            break;
        case 4:
            style = QTextListFormat::ListDecimal;
            break;
        case 5:
            style = QTextListFormat::ListLowerAlpha;
            break;
        case 6:
            style = QTextListFormat::ListUpperAlpha;
            break;
        case 7:
            style = QTextListFormat::ListLowerRoman;
            break;
        case 8:
            style = QTextListFormat::ListUpperRoman;
        }
        //设置缩进值
        cursor.beginEditBlock();
        QTextBlockFormat blockFmt = cursor.blockFormat();//获得段落缩进值
        QTextListFormat listFmt;
        if(cursor.currentList())
        {
            listFmt = cursor.currentList()->format();
        }
        else{
            listFmt.setIndent(blockFmt.indent() + 1);
            blockFmt.setIndent(0);
            cursor.setBlockFormat(blockFmt);
        }
        listFmt.setStyle(style);
        cursor.createList(listFmt);
        cursor.endEditBlock();
    }
    else{
        QTextBlockFormat bfmt;
        bfmt.setObjectIndex(-1);
        cursor.mergeBlockFormat(bfmt);
    }
}

  • main.cpp
#include "imgprocessor.h"

#include 

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QFont f("ZYSong18030", 12);
    a.setFont(f);
    ImgProcessor w;
    w.show();
    return a.exec();
}

最终实现效果及全部代码

全部代码

  • main.cpp
#include "imgprocessor.h"

#include 

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QFont f("ZYSong18030", 12);
    a.setFont(f);
    ImgProcessor w;
    w.show();
    return a.exec();
}

  • imgprocessor.h
#ifndef IMGPROCESSOR_H
#define IMGPROCESSOR_H

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include "showwidget.h"
#include 

class ImgProcessor : public QMainWindow
{
    Q_OBJECT

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

    void createActions();
    void createMenus();
    void createToolBars();
    void loadFile(QString filename);
    void mergeFormat(QTextCharFormat);

private slots:
    void showNewFile();//新建文件
    void showOpenFile();//打开文件
    void showPrintText();//打印文本文件
    void showPrintImage();//打印图片
    void showZoomIn();//放大
    void showZoomOut();//缩小
    void showRotate90(); //旋转90
    void showRotate180();
    void showRotate270();

protected slots:
    //字体格式
    void ShowFontComboBox(QString comboStr);
    void ShowSizeSpinBox(QString spinValue);
    void ShowBoldBtn();
    void ShowItalicBtn();
    void ShowUnderlineBtn();
    void ShowColorBtn();
    void ShowCurrentFormatChanged(const QTextCharFormat &fmt);

    //排版
    void showList(int);
    void showAlignment(QAction *act);
    void showCursorPositionChanged();

private:
    QMenu *fileMenu;
    QMenu *zoomMenu;
    QMenu *rotateMenu;
    QMenu *mirrorMenu;
    QImage img;
    QString fileName;

    ShowWidget *showWidget; //文件菜单项
    QAction *openFileAction;
    QAction *NewFileAction;
    QAction *printTRextAction;
    QAction *printImageAction;
    QAction *exitAction;
    QAction *copyAction;    //编辑菜单项
    QAction *cutAction;
    QAction *pasteAction;
    QAction *aboutAction;
    QAction *zoomInAction;
    QAction *zoomOutAction;
    QAction *rotate90Action;    //旋转菜单项
    QAction *rotate180Action;
    QAction *rotate270Action;
    QAction *mirrorVerticalAction;  //镜像菜单项
    QAction *mirrorHorizontalAction;
    QAction *undoAction;
    QAction *redoAction;
    QToolBar *fileTool; //工具栏
    QToolBar *zoomTool;
    QToolBar *rotateTool;
    QToolBar *mirrorTool;
    QToolBar *doToolBar;

    //字体格式功能
    QLabel *fontLabel;
    QFontComboBox *fontComboBox;
    QLabel *fontLabel2;
    QComboBox *sizeComboBox;
    QToolButton *boldBtn;
    QToolButton *italicBtn;
    QToolButton *underlineBtn;
    QToolButton *colorBtn;
    QToolBar *fontToolBar;

    //排版功能
    QLabel *listLabel;
    QComboBox *listComboBox;
    QActionGroup *actGrp;
    QAction *leftAction;
    QAction *rightAction;
    QAction *centerAction;
    QAction *justifyAction;
    QToolBar *listToolBar;
};
#endif // IMGPROCESSOR_H

  • imgprocessor.cpp
#include "imgprocessor.h"
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 

ImgProcessor::ImgProcessor(QWidget *parent)
    : QMainWindow(parent)
{
    setWindowTitle(tr("Easy Word"));    //窗口标题

    showWidget = new ShowWidget(this);
    setCentralWidget(showWidget);

    //在工具栏上嵌入控件
    //设置字体
    fontLabel = new QLabel(tr("字体:"));
    fontComboBox = new QFontComboBox;
    fontComboBox->setFontFilters(QFontComboBox::ScalableFonts);
    fontLabel2 = new QLabel(tr("字号:"));
    sizeComboBox = new QComboBox;
    QFontDatabase db;
    foreach(int size, db.standardSizes())
        sizeComboBox->addItem(QString::number(size));
    boldBtn = new QToolButton;
    boldBtn->setIcon(QIcon("bold.png"));
    boldBtn->setCheckable(true);
    italicBtn = new QToolButton;
    italicBtn->setIcon(QIcon("italic.png"));
    italicBtn->setCheckable(true);
    underlineBtn = new QToolButton;
    underlineBtn->setIcon(QIcon("under.png"));
    underlineBtn->setCheckable(true);
    colorBtn = new QToolButton;
    colorBtn->setIcon(QIcon("color.png"));
    colorBtn->setCheckable(true);

    //排版格式
    listLabel = new QLabel(tr("排序"));
    listComboBox = new QComboBox;
    listComboBox->addItem("Standard");
    listComboBox->addItem("QTextListFormat::ListDisc");
    listComboBox->addItem("QTextListFormat::ListCircle");
    listComboBox->addItem("QTextListFormat::ListSquare");
    listComboBox->addItem("QTextListFormat::ListDecimal");
    listComboBox->addItem("QTextListFormat::ListLowerAlpha");
    listComboBox->addItem("QTextListFormat::ListUpperAlpha");
    listComboBox->addItem("QTextListFormat::ListLowerRoman");
    listComboBox->addItem("QTextListFormat::ListUpperRoman");

    //创建动作、菜单、工具栏
    createActions();
    createMenus();
    createToolBars();

    if(img.load("mage.png"))
    {
        //在imagelabel中放置图像
        showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));
    }

    //字体设置
    connect(fontComboBox, SIGNAL(activated(QString)), this, SLOT(ShowFontComboBox(QString)));
    connect(sizeComboBox, SIGNAL(activated(QString)), this, SLOT(ShowSizeSpinBox(QString)));
    connect(boldBtn, SIGNAL(clicked()), this, SLOT(ShowBoldBtn()));
    connect(italicBtn, SIGNAL(clicked()), this, SLOT(ShowItalicBtn()));
    connect(underlineBtn, SIGNAL(clicked()), this, SLOT(ShowUnderlineBtn()));
    connect(colorBtn, SIGNAL(clicked()), this, SLOT(ShowColorBtn()));
    connect(showWidget->text, SIGNAL(currentCharFormatChanged(QTextCharFormat &)), this, SLOT(ShowCurrentFormatChanged(const QTextCharFormat &)));

    //排版格式
    connect(listComboBox, SIGNAL(activated(int)), this, SLOT(showList(int)));
    connect(showWidget->text->document(), SIGNAL(undoAvailable(bool)), redoAction, SLOT(setEnabled(bool)));
    connect(showWidget->text->document(), SIGNAL(redoAvailable(bool)), redoAction, SLOT(setEnabled(bool)));
    connect(showWidget->text->document(), SIGNAL(cursorPositionChanged()), this, SLOT(showCursorPositionChanged()));
}

ImgProcessor::~ImgProcessor()
{
}

void ImgProcessor::createActions()
{
    //“打开”动作
    openFileAction = new QAction(QIcon("open.png"), tr("打开"), this);
    openFileAction->setShortcut(tr("Ctrl+O"));
    openFileAction->setStatusTip(tr("打开一个文件"));
    connect(openFileAction, SIGNAL(triggered()), this, SLOT(showOpenFile()));

    //“新建”动作
    NewFileAction = new QAction(QIcon("new.png"), tr("新建"), this);
    NewFileAction->setShortcut(tr("Ctrl+N"));
    NewFileAction->setStatusTip(tr("新建一个文件"));
    connect(NewFileAction, SIGNAL(triggered()), this, SLOT(showNewFile()));

    //“退出”动作
    exitAction = new QAction(tr("退出"), this);
    exitAction->setShortcut(tr("Ctrl+Q"));
    exitAction->setStatusTip(tr("退出程序"));
    connect(exitAction, SIGNAL(triggered()), this, SLOT(close()));

    //“复制”动作
    copyAction = new QAction(QIcon("copy.png"), tr("复制"), this);
    copyAction->setShortcut(tr("Ctrl+C"));
    copyAction->setStatusTip(tr("复制文件"));
    connect(copyAction, SIGNAL(triggered()), showWidget->text, SLOT(copy()));

    //“剪切”动作
    cutAction = new QAction(QIcon("cut.png"), tr("剪切"), this);
    cutAction->setShortcut(tr("Ctrl+X"));
    cutAction->setStatusTip(tr("剪切文件"));
    connect(cutAction, SIGNAL(truggered()), showWidget->text, SLOT(cut()));

    //“粘贴”动作
    pasteAction = new QAction(QIcon("paste.png"), tr("粘贴"), this);
    pasteAction->setShortcut(tr("Ctrl+V"));
    pasteAction->setStatusTip(tr("粘贴文件"));
    connect(pasteAction, SIGNAL(triggered()), showWidget->text, SLOT(paste()));

    //“关于”动作
    aboutAction = new QAction(tr("关于"), this);
    connect(aboutAction, SIGNAL(triggered()), this, SLOT(QApplication::aboutQt()));

    //“打印文本”动作
    printTRextAction = new QAction(QIcon("printText.png"), tr("打印文本"), this);
    printTRextAction->setStatusTip(tr("打印一个文本"));
    connect(printTRextAction, SIGNAL(triggered()), this, SLOT(showPrintText()));


    //“打印图像”动作
    printImageAction = new QAction(QIcon("printImage.png"), tr("打印图像"), this);
    printImageAction->setStatusTip(tr("打印一幅图像"));
    connect(printImageAction, SIGNAL(triggered()), this, SLOT(showPrintImage()));

    //“放大”动作
    zoomInAction = new QAction(QIcon("zoomin.png"), tr("放大"), this);
    zoomInAction->setStatusTip(tr("放大一张照片"));
    connect(zoomInAction, SIGNAL(triggered()), this, SLOT(showZoomIn()));

    //“缩小”动作
    zoomOutAction = new QAction(QIcon("zoomout.png"), tr("缩小"), this);
    zoomOutAction->setStatusTip(tr("缩小一张照片"));
    connect(zoomOutAction, SIGNAL(triggered()), this, SLOT(showZoomOut()));

    //实现图像旋转的动作
    //90
    rotate90Action = new QAction(QIcon("rotate90.png"), tr("旋转90"), this);
    rotate90Action->setStatusTip(tr("将一幅图像旋转90度"));
    connect(rotate90Action, SIGNAL(triggered()), this, SLOT(showRotate90()));
    //180
    rotate180Action = new QAction(QIcon("rotate180.png"), tr("旋转180"), this);
    rotate180Action->setStatusTip(tr("将一幅图像旋转180度"));
    connect(rotate180Action, SIGNAL(triggered()), this, SLOT(showRotate180()));
    //270
    rotate270Action = new QAction(QIcon("rotate270.png"), tr("旋转270"), this);
    rotate270Action->setStatusTip(tr("将一副图像旋转270度"));
    connect(rotate270Action, SIGNAL(triggered()), this, SLOT(showRotate270()));

    //实现图像镜像的动作
    //纵向
    mirrorVerticalAction = new QAction(QIcon("mirrorV.png"), tr("纵向镜像"), this);
    mirrorVerticalAction->setStatusTip(tr("对一幅图像纵向镜像"));

    //横向
    mirrorHorizontalAction = new QAction(QIcon("mirrorH.png"), tr("横向镜像"), this);
    mirrorHorizontalAction->setStatusTip(tr("对一副图像横向镜像"));

    //实现撤销和恢复动作
    undoAction = new QAction(QIcon("undo.png"), tr("撤销"), this);
    connect(undoAction, SIGNAL(triggered()), showWidget->text, SLOT(undo()));

    redoAction = new QAction(QIcon("redo.png"), tr("重做"), this);
    connect(redoAction, SIGNAL(triggered()), showWidget->text, SLOT(redo()));

    //排序:左对齐、右对齐、居中和两端对齐
    actGrp = new QActionGroup(this);
    leftAction = new QAction(QIcon("left.png"), "左对齐", actGrp);
    leftAction->setCheckable(true);
    rightAction = new QAction(QIcon("right.png"), "右对齐", actGrp);
    rightAction->setCheckable(true);
    centerAction = new QAction(QIcon("center.png"), "居中", actGrp);
    centerAction->setCheckable(true);
    justifyAction = new QAction(QIcon("justify.png"), "两端对齐", actGrp);
    justifyAction->setCheckable(true);
    connect(actGrp, SIGNAL(triggered(QAction *)), this, SLOT(showAlignment(QAction *)));

}

void ImgProcessor::createMenus()
{
    //文件菜单
    fileMenu = menuBar()->addMenu(tr("文件"));
    fileMenu->addAction(openFileAction);
    fileMenu->addAction(NewFileAction);
    fileMenu->addAction(printTRextAction);
    fileMenu->addAction(printImageAction);
    fileMenu->addSeparator();//插入空格
    fileMenu->addAction(exitAction);

    //缩放菜单
    zoomMenu = menuBar()->addMenu(tr("编辑"));
    zoomMenu->addAction(copyAction);
    zoomMenu->addAction(cutAction);
    zoomMenu->addAction(pasteAction);
    zoomMenu->addAction(aboutAction);
    zoomMenu->addSeparator();
    zoomMenu->addAction(zoomInAction);
    zoomMenu->addAction(zoomOutAction);


    //旋转菜单
    rotateMenu = menuBar()->addMenu(tr("旋转"));
    rotateMenu->addAction(rotate90Action);
    rotateMenu->addAction(rotate180Action);
    rotateMenu->addAction(rotate270Action);

    //镜像菜单
    mirrorMenu = menuBar()->addMenu(tr("镜像"));
    mirrorMenu->addAction(mirrorVerticalAction);
    mirrorMenu->addAction(mirrorHorizontalAction);
}


void ImgProcessor::createToolBars()
{
    //文件工具条
    fileTool = addToolBar("File");
    fileTool->addAction(openFileAction);
    fileTool->addAction(NewFileAction);
    fileTool->addAction(printTRextAction);
    fileTool->addAction(printImageAction);

    //编辑工具条
    zoomTool = addToolBar("Edit");
    zoomTool->addAction(copyAction);
    zoomTool->addAction(cutAction);
    zoomTool->addAction(pasteAction);
    zoomTool->addSeparator();
    zoomTool->addAction(zoomInAction);
    zoomTool->addAction(zoomOutAction);

    //旋转工具条
    rotateTool = addToolBar("rotate");
    rotateTool->addAction(rotate90Action);
    rotateTool->addAction(rotate180Action);
    rotateTool->addAction(rotate270Action);

    //撤销和重做工具条
    doToolBar = addToolBar("doEdit");
    doToolBar->addAction(undoAction);
    doToolBar->addAction(redoAction);

    //字体工具条
    fontToolBar = addToolBar("font");
    fontToolBar->addWidget(fontLabel);
    fontToolBar->addWidget(fontLabel2);
    fontToolBar->addWidget(sizeComboBox);
    fontToolBar->addSeparator();
    fontToolBar->addWidget(boldBtn);
    fontToolBar->addWidget(italicBtn);
    fontToolBar->addWidget(underlineBtn);
    fontToolBar->addSeparator();
    fontToolBar->addWidget(colorBtn);

    //排版工具条
    listToolBar = addToolBar("list");
    listToolBar->addWidget(listLabel);
    listToolBar->addWidget(listComboBox);
    listToolBar->addSeparator();
    listToolBar->addActions(actGrp->actions());
}

void ImgProcessor::showNewFile()
{
    ImgProcessor *newImgProcessor = new ImgProcessor;
    newImgProcessor->show();
}

void ImgProcessor::loadFile(QString filename)
{
    qDebug() << "file name :" << filename;
    QFile file(filename);
    if(file.open(QIODevice::ReadOnly | QIODevice::Text))
    {
        QTextStream textStream(&file);
        while(!textStream.atEnd())
        {
            showWidget->text->append(textStream.readLine());
            qDebug() << "read line";
        }
    }
}

void ImgProcessor::showOpenFile()
{
    fileName = QFileDialog::getOpenFileName(this);
    if(!fileName.isEmpty())
    {
        if(showWidget->text->document()->isEmpty())
        {
            loadFile(fileName);
        }
        else
        {
            ImgProcessor *newImgProcessor = new ImgProcessor;
            newImgProcessor->show();
            newImgProcessor->loadFile(fileName);
        }
    }
}

void ImgProcessor::showPrintText()
{
    QPrinter printer;
    QPrintDialog printDialog(&printer, this);//创建一个QPrintDialog对象。
    if(printDialog.exec())
    {
        //获得QTextEdit 对象的文档
        QTextDocument *doc = showWidget->text->document();
        doc->print(&printer);
    }
}

void ImgProcessor::showPrintImage()
{
    QPrinter printer;
    QPrintDialog printDialog(&printer, this);
    if(printDialog.exec())
    {
        QPainter painter(&printer);
        QRect rect = painter.viewport();//获得QPainter 对象的视图矩形区域
        QSize size = img.size();
        //安装图片的比例大小重新设定视图矩形区域
        size.scale(rect.size(), Qt::KeepAspectRatio);
        painter.setViewport(rect.x(), rect.y(), size.width(), size.height());
        painter.setWindow(img.rect());
        painter.drawImage(0, 0, img);

    }
}

void ImgProcessor::showZoomIn()
{
    if(img.isNull())//有效判断
    {
        return;
    }
    QMatrix martix;//声明一个QMatrix类的实例
    martix.scale(2, 2); //该参数决定x方向和y方向的缩放比例
    img = img.transformed(martix);
    showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));
}

void ImgProcessor::showZoomOut()
{
    if(img.isNull())
    {
        return ;
    }
    QMatrix matrix;
    matrix.scale(0.5, 0.5);
    img = img.transformed(matrix);
    showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));
}

void ImgProcessor::showRotate90()
{
    if(img.isNull())
    {
        return ;
    }
    QMatrix matrix;
    matrix.rotate(90);
    img = img.transformed(matrix);
    showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));
}

void ImgProcessor::showRotate180()
{
    if(img.isNull())
    {
        return ;
    }
    QMatrix matrix;
    matrix.rotate(180);
    img = img.transformed(matrix);
    showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));
}

void ImgProcessor::showRotate270()
{
    if(img.isNull())
    {
        return ;
    }
    QMatrix matrix;
    matrix.rotate(270);
    img = img.transformed(matrix);
    showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));
}

void ImgProcessor::ShowFontComboBox(QString comboStr)
{
    //设置字体
    QTextCharFormat fmt;//创建一个QTextCharFormat对象
    fmt.setFontFamily(comboStr);//选择的字体名称设置给QTextCharFormat对象
    mergeFormat(fmt);//将新的格式应用到光标选区内的字符。
}

void ImgProcessor::mergeFormat(QTextCharFormat format)
{
    //设置格式
    QTextCursor cursor = showWidget->text->textCursor();//获得编辑框中的光标

    if(!cursor.hasSelection())
    {
        cursor.select(QTextCursor::WordUnderCursor);
    }
    cursor.mergeCharFormat(format);
    showWidget->text->mergeCurrentCharFormat(format);
}

void ImgProcessor::ShowSizeSpinBox(QString spinValue)
{
    //设置字号
    qDebug() << spinValue << "--" << spinValue.toFloat();
    QTextCharFormat fmt;
    fmt.setFontPointSize(spinValue.toFloat());
    showWidget->text->mergeCurrentCharFormat(fmt);
}

void ImgProcessor::ShowBoldBtn()
{
    //设置选中的字体加粗
    QTextCharFormat fmt;
    fmt.setFontWeight(boldBtn->isChecked() ? QFont::Bold : QFont::Normal);
    showWidget->text->mergeCurrentCharFormat(fmt);
}

void ImgProcessor::ShowItalicBtn()
{
    //设置字体斜体
    QTextCharFormat fmt;
    fmt.setFontItalic(italicBtn->isChecked());
    showWidget->text->mergeCurrentCharFormat(fmt);
}

void ImgProcessor::ShowUnderlineBtn()
{
    //设置文字下划线
    QTextCharFormat fmt;
    fmt.setFontUnderline(underlineBtn->isChecked());
    showWidget->text->mergeCurrentCharFormat(fmt);
}

void ImgProcessor::ShowColorBtn()
{
    //设置颜色
    QColor color = QColorDialog::getColor(Qt::red, this);
    if(color.isValid())
    {
        QTextCharFormat fmt;
        fmt.setForeground(color);
        showWidget->text->mergeCurrentCharFormat(fmt);
    }
}

void ImgProcessor::ShowCurrentFormatChanged(const QTextCharFormat &fmt)
{
    fontComboBox->setCurrentIndex(fontComboBox->findText(fmt.fontFamily()));
    sizeComboBox->setCurrentIndex(sizeComboBox->findText(QString::number(fmt.fontPointSize())));
    boldBtn->setChecked(fmt.font().bold());
    italicBtn->setChecked(fmt.fontItalic());
    underlineBtn->setChecked(fmt.fontUnderline());
}

void ImgProcessor::showAlignment(QAction *act)
{
    if(act == leftAction)
    {
        //左对齐
        showWidget->text->setAlignment(Qt::AlignLeft);
    }
    if(act == rightAction)
    {
        //右对齐
        showWidget->text->setAlignment(Qt::AlignRight);
    }
    if(act == centerAction)
    {
        //居中
        showWidget->text->setAlignment(Qt::AlignCenter);
    }
    if(act == justifyAction)
    {
        //两端对齐
        showWidget->text->setAlignment(Qt::AlignJustify);
    }
}

void ImgProcessor::showCursorPositionChanged()
{
    if(showWidget->text->alignment() == Qt::AlignLeft)
        leftAction->setChecked(true);
    if(showWidget->text->alignment() == Qt::AlignRight)
        rightAction->setChecked(true);
    if(showWidget->text->alignment() == Qt::AlignCenter)
        centerAction->setChecked(true);
    if(showWidget->text->alignment() == Qt::AlignJustify)
        justifyAction->setChecked(true);
}

void ImgProcessor::showList(int index)
{
    //获得编辑框的QTextCursor对象指针
    QTextCursor cursor = showWidget->text->textCursor();
    if(index != 0)
    {
        QTextListFormat::Style style = QTextListFormat::ListDisc;//从下拉列表中旋转确定QTextlistformat的style属性值。
        switch (index) {
        default:
        case 1:
            style = QTextListFormat::ListDisc;
            break;
        case 2:
            style = QTextListFormat::ListCircle;
            break;
        case 3:
            style = QTextListFormat::ListSquare;
            break;
        case 4:
            style = QTextListFormat::ListDecimal;
            break;
        case 5:
            style = QTextListFormat::ListLowerAlpha;
            break;
        case 6:
            style = QTextListFormat::ListUpperAlpha;
            break;
        case 7:
            style = QTextListFormat::ListLowerRoman;
            break;
        case 8:
            style = QTextListFormat::ListUpperRoman;
        }
        //设置缩进值
        cursor.beginEditBlock();
        QTextBlockFormat blockFmt = cursor.blockFormat();//获得段落缩进值
        QTextListFormat listFmt;
        if(cursor.currentList())
        {
            listFmt = cursor.currentList()->format();
        }
        else{
            listFmt.setIndent(blockFmt.indent() + 1);
            blockFmt.setIndent(0);
            cursor.setBlockFormat(blockFmt);
        }
        listFmt.setStyle(style);
        cursor.createList(listFmt);
        cursor.endEditBlock();
    }
    else{
        QTextBlockFormat bfmt;
        bfmt.setObjectIndex(-1);
        cursor.mergeBlockFormat(bfmt);
    }
}

  • showwidget.h
#ifndef SHOWWIDGET_H
#define SHOWWIDGET_H

#include 
#include 
#include 
#include 

class ShowWidget : public QWidget
{
    Q_OBJECT
public:
    explicit ShowWidget(QWidget *parent = nullptr);

    QImage img;
    QLabel *imageLabel;
    QTextEdit *text;

signals:
public slots:

};

#endif // SHOWWIDGET_H

  • showwidget.cpp
#include "showwidget.h"
#include

ShowWidget::ShowWidget(QWidget *parent) : QWidget(parent)
{
    imageLabel = new QLabel;
    imageLabel->setScaledContents(true);
    text = new QTextEdit;
    QHBoxLayout *mainLayout = new QHBoxLayout(this);
    mainLayout->addWidget(imageLabel);
    mainLayout->addWidget(text);
}


界面效果

Qt5——主窗口_第2张图片

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