• Qt5开发从入门到精通——第五篇五节（ 文本编辑器 Easy Word 开发 V1.4详解 ）

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    文章目录

    前言

    本章节会给大家带来基于文本编辑器 Easy Word V1.3开发升级到Easy Word V1.4开发的解析。

    一、基于 Easy Word V1.3 框架进行升级 Easy Word V1.4框架

    1.1、实现增加排版模块

    (1)在 “mainwindow.h” 头文件中添加 “private:” 变量：

        /******************排版功能************************/

    QLabel *listLabel;
    QComboBox *listComboBox;
    QActionGroup *actGrp;
    QAction *leftAction;
    QAction *rightAction;
    QAction *centerAction;
    QAction *justifyAction;
    QToolBar *listToolBar;

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    (2) 在 “mainwindow.h” 头文件中添加 “private slots:” 变量：

        /************排版功能********************************/
    void ShowList(int);
    void ShowAlignment(QAction *act);

    void ShowCursorPositionChanged();

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    (3) 在相对应的构造函数中，在语句 “setCentralWidget(showWidget);” 与语句 "createActions() ; "之间添加如下代码：

    /*****************排版**********************************/
    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");

    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,SIGNAL(cursorPositionChanged()),this,SLOT(ShowCursorPositionChanged()));

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    (4)在相对应的工具栏 createActions() 函数中添加如下代码：

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

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    (5)在相对应的工具栏 createToolBars() 函数中添加如下代码：

        listToolBar =addToolBar("list");
    listToolBar->addWidget(listLabel);
    listToolBar->addWidget(listComboBox);
    listToolBar->addSeparator();
    listToolBar->addActions(actGrp->actions())

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    1.2、槽函数实现段落对齐

    完成对按下某个对齐按钮的响应使用 ShowAlignmentO函数，根据比较判断触发的是哪个对齐按钮，调用 QTextEdit 的 setAlignment()函数可以实现当前段落的对齐调整。响应文本中光标位置处发生改变的信号的 ShowCursorPositionChanged()函数。

    /********************排版编辑********************************/

void MainWindow::ShowAlignment(QAction *act)       //当前段落对齐
{
    if(act==leftAction)
    showWidget->text->setAlignment(Qt::AlignLeft);
    if(act==rightAction)
    showWidget->text->setAlignment(Qt::AlignRight);
    if(act==centerAction)
    showWidget->text->setAlignment(Qt::AlignCenter);
    if(act==justifyAction)
    showWidget->text->setAlignment(Qt::AlignJustify);
}

void MainWindow::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 MainWindow::ShowList(int index)      //实现文本排序
{
    //／获得编辑框的 QTextCursor 对象指针
    QTextCursor cursor=showWidget->text->textCursor();
    if (index!=0)
    {
        QTextListFormat::Style style=QTextListFormat:: ListDisc;
        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; break;
        }


        //设置缩进
        cursor.beginEditBlock () ;
        QTextBlockFormat blockFmt=cursor.blockFormat();
        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);
    }

}

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    二、效果实例

    图一
    在这里插入图片描述
    图二
    图标和图片放到新建的Resources中
    在这里插入图片描述

    三、原码解析

    工程文件（包含图标）已经上传GitHub，通过git直接拉取即可

    git clone https://github.com/dhn111/EasyWord.git



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    mainwindow.h

    #ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include "showwidget.h"
#include 
#include 
#include 
#include               //读入文本
#include 
#include 
#include 
#include   //打印文本
#include 
#include                //打印图片
#include 
#include 
#include         //文字颜色
#include 
#include       //排版功能
#include 
class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = 0);
    ~MainWindow();
    void createActions();       //创建动作
    void createMenus();         //创建菜单
    void createToolBars ();     //创建工具栏
    void loadFile(QString filename);
    void mergeFormat(QTextCharFormat);

private:
    QMenu *fileMenu;                     //各项菜单栏
    QMenu *zoomMenu;
    QMenu *rotateMenu;
    QMenu *mirrorMenu;
    QImage img;
    QString fileName;
    ShowWidget *showWidget;
    QAction *openFileAction;          //文件菜单项
    QAction *NewFileAction;
    QAction *PrintTextAction;
    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;

    /****************文本编辑功能*****************/

    QLabel *fontLabel1; //字体设置项
    QFontComboBox *fontComboBox;
    QLabel *fontLabel2;
    QComboBox *sizeComboBox;
    QToolButton *boldBtn;
    QToolButton *italicBtn;
    QToolButton *underlineBtn;
    QToolButton *colorBtn;
    QToolBar *fontToolBar; //字体工具栏



    /******************排版功能************************/

    QLabel *listLabel;
    QComboBox *listComboBox;
    QActionGroup *actGrp;
    QAction *leftAction;
    QAction *rightAction;
    QAction *centerAction;
    QAction *justifyAction;
    QToolBar *listToolBar;



private slots:
    void ShowNewFile();     //新建文件
    void ShowOpenFile();    //打开文件
    void ShowPrintText();   //打印文本
    void ShowPrintImage();  //打印图像
    void ShowZoomIn();      //缩放功能放大
    void ShowZoomOut();     //缩放功能缩小
    void ShowRotate90();    //旋转90°
    void ShowRotate180();   //旋转180°
    void ShowRotate270 ();  //旋转270°
    void ShowMirrorVertical();  //纵向
    void ShowMirrorHorizontal (); //横向



    /*****************文本编辑功能****************************/

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


    /************排版功能********************************/
    void ShowList(int);
    void ShowAlignment(QAction *act);

    void ShowCursorPositionChanged();


};

#endif // MAINWINDOW_H


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    showwidget.h

    #ifndef SHOWWIDGET_H
#define SHOWWIDGET_H

#include 
#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


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    main.cpp

    #include "mainwindow.h"
#include 

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

    return a.exec();
}


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    mainwindow.cpp

    #include "mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{

    //各项菜单栏
    fileMenu = new QMenu;
    zoomMenu = new QMenu;
    rotateMenu = new QMenu;
    mirrorMenu = new QMenu;
    showWidget = new ShowWidget;


    //文件菜单
    openFileAction =new QAction;
    NewFileAction  =new QAction;
    PrintTextAction =new QAction;
    PrintImageAction =new QAction;
    exitAction       = new QAction;

     //缩放菜单
     copyAction   =new QAction;
     cutAction    =new QAction;
     pasteAction  =new QAction;
     aboutAction  =new QAction;
     zoomInAction =new QAction;
     zoomOutAction=new QAction;

     //旋转菜单项
     rotate90Action =new QAction;
     rotate180Action=new QAction;
     rotate270Action=new QAction;

     //镜像菜单项
     mirrorVerticalAction  =new QAction;
     mirrorHorizontalAction=new QAction;
     undoAction  =new QAction;
     redoAction  =new QAction;

     //工具栏
     fileTool = new  QToolBar;
     zoomTool = new  QToolBar;
     rotateTool = new  QToolBar;
     mirrorTool = new  QToolBar;
     doToolBar = new  QToolBar;


    setWindowTitle(tr("Easy Word"));  //设置窗体标题
    showWidget =new ShowWidget(this); //（a）
    setCentralWidget(showWidget);
/*****************排版**********************************/
    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");

    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,SIGNAL(cursorPositionChanged()),this,SLOT(ShowCursorPositionChanged()));

    /*创建动作、菜单、工具栏的函数*/
    createActions() ;
    createMenus();
    createToolBars();
    if(img.load(":/src/PKQ.png"))
    {
        //在 imageLabel 对象中放置图片
        showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));
    }
}

MainWindow::~MainWindow()
{

}

void MainWindow::createActions()
{
    //“打开”动作
    openFileAction =new QAction(QIcon(":/src/open.png"),tr("打开"),this);  //(a)
    openFileAction->setShortcut (tr ("Ctrl+O"));                      //(b)
    openFileAction->setStatusTip(tr("打开一个文件 "));                 //(c)
    connect(openFileAction,SIGNAL(triggered()),this,SLOT(ShowOpenFile()));
    //"新建“动作
    NewFileAction =new QAction(QIcon(":/src/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(":/src/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(":/src/cut.png"),tr("剪切"),this);
    cutAction->setShortcut(tr("Ctrl+X"));
    cutAction->setStatusTip(tr("剪切文件")) ;
    connect(cutAction,SIGNAL( triggered ()), showWidget->text, SLOT (cut()));
    //"粘贴“动作
    pasteAction =new QAction(QIcon(":/src/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
    PrintTextAction =new QAction(QIcon(":/src/printText.png"),tr(" 打印文本"), this);
    PrintTextAction->setStatusTip(tr("打印一个文本"));
    connect (PrintTextAction, SIGNAL (triggered()), this, SLOT (ShowPrintText ()));
    //"打印图片“动作
    PrintImageAction =new QAction(QIcon (":/src/printimage.png" ), tr("打印图片"), this);
    PrintImageAction->setStatusTip(tr("打印一幅图片"));
    connect(PrintImageAction, SIGNAL (triggered()), this, SLOT (ShowPrintImage()));
    //"放大“动作
    zoomInAction =new QAction (QIcon(":/src/zoomin.png"),tr(" 放大 "),this);
    zoomInAction->setStatusTip(tr("放大一幅图片"));
    connect(zoomInAction,SIGNAL(triggered()),this,SLOT(ShowZoomIn()));
    //"缩小“动作
    zoomOutAction =new QAction(QIcon(":/src/zoomout.png"),tr("缩小 "),this);
    zoomOutAction->setStatusTip(tr("缩小一幅图片 "));
    connect (zoomOutAction, SIGNAL(triggered ()), this, SLOT (ShowZoomOut()));
    //实现图片旋转的动作 (Action)
    //旋转 90°
    rotate90Action =new QAction (QIcon (":/src/rotate90.png"), tr("旋转 90°") ,this);
    rotate90Action->setStatusTip(tr("将一幅图旋转90°"));
    connect(rotate90Action, SIGNAL (triggered()), this, SLOT (ShowRotate90()));
    //旋转180°
    rotate180Action =new QAction (QIcon(":/src/rotate180.png"), tr("旋转 180°"), this);
    rotate180Action->setStatusTip(tr("将一幅图旋转180°"));
    connect(rotate180Action, SIGNAL (triggered()), this, SLOT (ShowRotate180()));
    //旋转270°
    rotate270Action =new QAction(QIcon (":/src/rotate270.png"), tr("旋转 270°"), this);
    rotate270Action->setStatusTip(tr("将一幅图旋转 270°"));
    connect(rotate270Action, SIGNAL (triggered()), this, SLOT (ShowRotate270()));
    //实现图片镜像的动作（Action）
    //纵向镜像
    mirrorVerticalAction =new QAction(QIcon(":/src/mirrorVertical.png"),tr("纵向镜像"), this);
    mirrorVerticalAction->setStatusTip(tr("对一幅图做纵向镜像")) ;
    connect (mirrorVerticalAction, SIGNAL (triggered()), this, SLOT (ShowMirrorVertical()));
    //横向镜像
    mirrorHorizontalAction =new QAction(QIcon(":/src/mirrorHorizontal.png"),tr("横向镜像 "),this);
    mirrorHorizontalAction->setStatusTip(tr("对一幅图做横向镜像")) ;
    connect (mirrorHorizontalAction, SIGNAL (triggered()), this, SLOT (ShowMirrorHorizontal ()));
    //实现撤销和重做的动作（ACtion）
    //撤销和重做
    undoAction =new QAction (QIcon(":/src/undo.png"),"撤销",this);
    connect(undoAction,SIGNAL(triggered()),showWidget->text,SLOT(undo()));
    redoAction =new QAction(QIcon(":/src/redo.png"),"重做",this);
    connect(redoAction, SIGNAL(triggered()),showWidget->text,SLOT(redo()));


    //在工具栏上嵌入控件
    //设置字号
   fontLabel1 =new QLabel (tr("字体："));
   fontComboBox =new QFontComboBox;
   fontComboBox->setFontFilters(QFontComboBox::ScalableFonts);
   fontLabel2 =new QLabel(tr("字号："));
   sizeComboBox =new QComboBox;
   QFontDatabase db;
    /***************文本编辑功能******************/
   foreach(int size,db.standardSizes())
   {
       sizeComboBox->addItem(QString::number(size));
   }
   boldBtn =new QToolButton;
   boldBtn->setIcon(QIcon(":/src/bold.png"));
   boldBtn->setCheckable(true);
   connect (boldBtn, SIGNAL (clicked()),this,SLOT (ShowBoldBtn()));

   italicBtn =new QToolButton;
   italicBtn->setIcon(QIcon(":/src/italic.png"));
   italicBtn->setCheckable(true);
   connect (italicBtn, SIGNAL (clicked()), this, SLOT (ShowItalicBtn ())) ;

   underlineBtn =new QToolButton;
   underlineBtn->setIcon(QIcon(":/src/underline.png"));
   underlineBtn->setCheckable(true);
   connect (underlineBtn, SIGNAL (clicked()), this, SLOT (ShowUnderlineBtn ()));

   colorBtn =new QToolButton;
   colorBtn->setIcon(QIcon(":/src/color.png"));
   colorBtn->setCheckable(true);
   connect(colorBtn,SIGNAL(clicked()),this,SLOT(ShowColorBtn()));


   connect(fontComboBox,SIGNAL(activated(QString)),this,SLOT(ShowFontComboBox(QString)));
   connect(sizeComboBox,SIGNAL(activated(QString)),this,SLOT(ShowSizeSpinBox(QString)));





   connect(showWidget->text,SIGNAL(currentCharFormatChanged(QTextCharFormat&)) , this,SLOT(ShowCurrentFormatChanged(QTextCharFormat&)));




   /******************排版功能********************************/
   //左对齐、右对齐、居中和两端对齐
   actGrp =new QActionGroup(this);
   leftAction =new QAction(QIcon(":/src/left.png"),"左对齐",actGrp);

   leftAction->setCheckable(true);
   rightAction =new QAction(QIcon(":/src/right.png"),"右对齐 ",actGrp);
   rightAction->setCheckable(true);
   centerAction =new QAction(QIcon(":/src/center.png")," 居中", actGrp);
   centerAction->setCheckable(true);
   justifyAction =new QAction(QIcon(":/src/justify.png"),"两端对齐 ",actGrp);
   justifyAction->setCheckable(true);
   connect(actGrp,SIGNAL(triggered(QAction*)),this,SLOT(ShowAlignment(QAction*)));

}

void MainWindow::createMenus()
{
    //文件菜单

    fileMenu =menuBar()->addMenu(tr("文件")) ;
    fileMenu->addAction(openFileAction);
    fileMenu->addAction(NewFileAction);
    fileMenu->addAction(PrintTextAction);
    fileMenu->addAction(PrintImageAction);
    fileMenu->addSeparator();
    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 MainWindow::createToolBars()
{
    //文件工具条
    fileTool =addToolBar("File");
    fileTool->addAction(openFileAction);
    fileTool->addAction(NewFileAction);
    fileTool->addAction(PrintTextAction);
    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(fontLabel1);
    fontToolBar->addWidget(fontComboBox);
    fontToolBar->addWidget(fontLabel2);
    fontToolBar->addWidget(sizeComboBox);
    fontToolBar->addSeparator();
    fontToolBar->addWidget(boldBtn);
    fontToolBar->addWidget (italicBtn);
    fontToolBar->addWidget(underlineBtn);
    fontToolBar->addSeparator();
    fontToolBar->addWidget(colorBtn);



    listToolBar =addToolBar("list");
    listToolBar->addWidget(listLabel);
    listToolBar->addWidget(listComboBox);
    listToolBar->addSeparator();
    listToolBar->addActions(actGrp->actions());

}

void MainWindow::ShowNewFile()                  //新建文件的槽
{
    MainWindow *newMainWindow =new MainWindow;
    newMainWindow->show();
}

void MainWindow::ShowOpenFile()                  //读取文件的槽
{
    fileName =QFileDialog::getOpenFileName(this);
    if(!fileName.isEmpty())
    {
        if(showWidget->text->document()->isEmpty())
        {
            loadFile(fileName);
        }else
        {
            MainWindow *newMainWindows = new MainWindow;
            newMainWindows->show();
            newMainWindows->loadFile(fileName);
        }


    }
}


#if 1
void MainWindow::loadFile(QString filename)
{

     QFile  file(filename);

    if(file.open(QIODevice::ReadOnly|QIODevice::Text))
    {
         QTextStream textStream(&file);
        while(!textStream.atEnd())
        {


            showWidget->text->append(textStream.readLine());


        }


    }
}
#endif


#if 0
void MainWindow::loadFile(QString filename)
{

     QFile  file(filename);
     QTextCodec *codec = QTextCodec::codecForName("GBK");
    if(file.open(QIODevice::ReadOnly|QIODevice::Text))
    {

        while(!file.atEnd())
        {
            QByteArray line = file.readLine();
            QString str = codec->toUnicode(line);
            showWidget->text->append(str);

            //qDebug()<

        }


    }
}
#endif

void MainWindow::ShowPrintText()             //文本打印
{
    QPrinter printer;
    QPrintDialog printDialog(&printer,this);
    if(printDialog.exec())
    {
        //获得QTextEdit对象的文档
        QTextDocument *doc =showWidget->text->document();
        doc->print(&printer); //打印
    }
}

void MainWindow::ShowPrintImage()           //图像打印
{
    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();          //获得图像的大小
        /*按照图形的比例大小重新设置视图矩形区域*/
        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 MainWindow::ShowZoomIn()          //图像放大
{
    if(img.isNull())     //有效性判断
    {
        return;
    }

    QMatrix matrix;     //声明一个QMatrix类的实例
    matrix.scale(2,2);
    img = img.transformed(matrix);
    showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));


}

void MainWindow::ShowZoomOut()      //图像缩小
{
    if (img.isNull())
    {
        return;
    }
    QMatrix matrix;
    matrix.scale(0.5,0.5);
    img=img.transformed(matrix);
    showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));


}

void MainWindow::ShowRotate90()                  //旋转90°
{
    if(img.isNull())
    {
        return;
    }
    QMatrix matrix;
    matrix.rotate(90);
    img = img.transformed(matrix);
    showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));

}


void MainWindow::ShowRotate180()        //旋转180°
{
    if(img.isNull())
    {
        return;
    }
    QMatrix matrix;
    matrix.rotate(180);
    img = img.transformed(matrix);
    showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));
}

void MainWindow::ShowRotate270()      //旋转270°
{
    if(img.isNull())
    {
        return;
    }
    QMatrix matrix;
    matrix.rotate(270);
    img = img.transformed(matrix);
    showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));
}

void MainWindow::ShowMirrorVertical()   //纵向镜像
{
    if(img. isNull ())
    return;
    img=img.mirrored(false,true);
    showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));
}
void MainWindow::ShowMirrorHorizontal() //横向镜像
{
    if(img. isNull ())
    return;
    img=img.mirrored(true,false);
    showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));
}

/************************文本编辑***********************************/
void MainWindow::ShowFontComboBox(QString comboStr)
{
    QTextCharFormat fmt;             //设置字体
    fmt.setFontFamily(comboStr);
    mergeFormat(fmt);
}

void MainWindow::mergeFormat(QTextCharFormat format)
{
    QTextCursor cursor =showWidget->text->textCursor ();  //获得编辑框中的光标
    if (!cursor. hasSelection ()) //(a)
    cursor.select(QTextCursor::WordUnderCursor);
    cursor.mergeCharFormat (format); // (b)
    showWidget->text->mergeCurrentCharFormat(format); //(c)
}

void MainWindow::ShowSizeSpinBox(QString spinValue)
{
    QTextCharFormat fmt;
    fmt.setFontPointSize (spinValue.toFloat());
    showWidget->text->mergeCurrentCharFormat(fmt);
}

void MainWindow::ShowBoldBtn()
{
    QTextCharFormat fmt;
    fmt.setFontWeight(boldBtn->isChecked()?QFont::Bold:QFont:: Normal);
    showWidget->text->mergeCurrentCharFormat(fmt);
}

void MainWindow::ShowItalicBtn()
{
    QTextCharFormat fmt;
    fmt.setFontItalic(italicBtn->isChecked());
    showWidget->text->mergeCurrentCharFormat(fmt);
}
void MainWindow::ShowUnderlineBtn()
{
    QTextCharFormat fmt;
    fmt. setFontUnderline (underlineBtn->isChecked ());
    showWidget->text->mergeCurrentCharFormat(fmt);
}

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

void MainWindow::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());
}


/********************排版编辑********************************/

void MainWindow::ShowAlignment(QAction *act)       //当前段落对齐
{
    if(act==leftAction)
    showWidget->text->setAlignment(Qt::AlignLeft);
    if(act==rightAction)
    showWidget->text->setAlignment(Qt::AlignRight);
    if(act==centerAction)
    showWidget->text->setAlignment(Qt::AlignCenter);
    if(act==justifyAction)
    showWidget->text->setAlignment(Qt::AlignJustify);
}

void MainWindow::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 MainWindow::ShowList(int index)      //实现文本排序
{
    //／获得编辑框的 QTextCursor 对象指针
    QTextCursor cursor=showWidget->text->textCursor();
    if (index!=0)
    {
        QTextListFormat::Style style=QTextListFormat:: ListDisc;
        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; break;
        }


        //设置缩进
        cursor.beginEditBlock () ;
        QTextBlockFormat blockFmt=cursor.blockFormat();
        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);
    }

}


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    showwidget.cpp

    #include "showwidget.h"

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);
}


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    四、总结

    窗口构成会在应用程序开发中经常用到的

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  • 原文地址：https://blog.csdn.net/weixin_44759598/article/details/126743609