【Qt5开发及实例】16、实现一个简单的文本编辑器（over）

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实现一个简单的文本编辑器

其他具体的代码基础看前面：http://blog.csdn.net/cutter_point/article/details/42839071

1、功能

这个程序又添加了文本编辑功能，什么加粗，斜体，下划线，字体设置，字号设置，文字排版，段落对齐功能。

2、代码全展示

头文件

showwidget.h

/*** 书本:【Qt5开发及实例】* 功能:实现一个简单的文本编辑器* 文件:showwidget.h* 时间:2015年1月18日10:03:21* 作者:cutter_point*/#ifndef SHOWWIDGET_H#define SHOWWIDGET_H#include <QWidget>#include <QLabel>#include <QTextEdit>#include <QImage>class ShowWidget : public QWidget{  Q_OBJECTpublic:  explicit ShowWidget(QWidget *parent = 0);  QImage img;  QLabel *imageLabel;  QTextEdit *text;signals:public slots:};#endif // SHOWWIDGET_H

imageprocessor.h

/*** 书本:【Qt5开发及实例】* 功能:实现一个简单的文本编辑器* 文件:showwidget.h* 时间:2015年1月18日10:41:52* 作者:cutter_point*/#ifndef IMAGEPROCESSOR_H#define IMAGEPROCESSOR_H#include <QMainWindow>#include <QImage>#include <QLabel>#include <QMenu>#include <QMenuBar>#include <QAction>#include <QComboBox>#include <QSpinBox>#include <QToolBar>#include <QFontComboBox>#include <QToolButton>#include <QTextCharFormat>#include "showwidget.h"class ImageProcessor : public QMainWindow{  Q_OBJECTpublic:  ImageProcessor(QWidget *parent = 0);  ~ImageProcessor();  //创建动作  void createActions();  //创建菜单  void createMenus();  //创建工具栏  void createToolBars();  void loadFile(QString filename);    //加载文件  void mergeFormat(QTextCharFormat);    //文本格式private:  //文字排版功能  QLabel *listLabel;    //标签，“排序”  QComboBox *listComboBox;    //各种不同的排序,下拉框  QActionGroup *actGrp;   //一个action组  QAction *leftAction;    //左对齐  QAction *rightAction;   //右对齐  QAction *centerAction;    //居中对齐  QAction *justifyAction;     //两端对齐  QToolBar *listToolBar;    //存放排序工具的工具栏  //文字工具栏，实现对文字的编辑功能  QLabel *fontLabel1;   //标签，字体  QFontComboBox *fontComboBox;    //字体的选择下拉  QLabel *fontLabel2;   //字号  QComboBox *sizeComboBox;    //字号下拉  QToolButton *boldBtn;   //加粗  QToolButton *italicBtn;   //斜体  QToolButton *underlineBtn;    //下划线  QToolButton *colorBtn;    //字体颜色选择  //添加一个存放这些字体处理工具的工具栏  QToolBar *fontToolBar;  //各项菜单栏  QMenu *fileMenu;  QMenu *zoomMenu;  QMenu *rotateMenu;  QMenu *mirrorMenu;  QImage img;   //图片  QString fileName;     //文件名  ShowWidget *showWidget;     //显示流  //文件菜单项  QAction *openFileAction;  QAction *NewFileAction;  QAction *PrintTextAction;  QAction *PrintImageAction;  QAction *exitAction;  //编辑菜单项  QAction *copyAction;  QAction *cutAction;  QAction *pasteAction;  QAction *aboutAction;  QAction *zoomInAction;  QAction *zoomOutAction;  //旋转菜单项  QAction *rotate90Action;  QAction *rotate180Action;  QAction *rotate270Action;  //镜像菜单项  QAction *mirrorVerticalAction;  QAction *mirrorHorizontalAction;  QAction *undoAction;  QAction *redoAction;  //工具栏  QToolBar *fileTool;  QToolBar *zoomTool;  QToolBar *rotateTool;  QToolBar *mirrorTool;  QToolBar *doToolBar;protected slots:    //添加函数槽  void ShowList(int);   //显示排序列表  void ShowAlignment(QAction *act);   //展示不同的排序结果  void ShowCursorPositionChanged();   //光标位置改变？？？   //-------------------------------------------------------------------------------  void ShowNewFile();   //新建一个新的文件  void ShowOpenFile();    //打开文件  void ShowPrintText();   //打印功能的实现  void ShowPrintImage();    //打印图片  void ShowZoomIn();    //关于图片的缩放功能  void ShowZoomOut();   //图片缩小  void ShowRotate90();    //旋转90度  void ShowRotate180();   //180度  void ShowRotate270();   //270度  void ShowMirrorVertical();    //水平镜像  void ShowMirrorHorizontal();    //垂直镜像  //-------------------------------------------------------------------------------  //添加文字处理的相应槽函数  void ShowFontComboBox(QString comboStr);    //显示字体的改变  void ShowSizeSpinBox(QString spinValue);    //字号的改变  void ShowBoldBtn();   //加粗  void ShowItalicBtn();   //斜体  void ShowUnderlineBtn();      //下划线  void ShowColorBtn();      //颜色的改变  void ShowCurrentFormatChanged(const QTextCharFormat &fmt);    //设置字符格式  //当光标所在的字符格式改变的时候，调用这个函数，这个函数根据新的格式将工具栏上的控件显示更新};#endif // IMAGEPROCESSOR_H

源文件

showwidget.cpp

/*** 书本:【Qt5开发及实例】* 功能:实现一个简单的文本编辑器* 文件:showwidget.h* 时间:2015年1月18日10:03:21* 作者:cutter_point*/#include "showwidget.h"#include <QHBoxLayout>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);}

imageprocessor.cpp

/*** 书本:【Qt5开发及实例】* 功能:实现一个简单的文本编辑器* 文件:showwidget.h* 时间:2015年1月18日10:41:52* 作者:cutter_point*/#include "imageprocessor.h"#include <QApplication>#include <QDebug>#include <QFileDialog>#include <QFile>#include <QTextStream>//#include <QPrintDialog>#include <QtPrintSupport/QPrintDialog>#include <QtPrintSupport/QPrinter>#include <QPainter>#include <QColorDialog>#include <QColor>#include <QTextList>ImageProcessor::ImageProcessor(QWidget *parent)  : QMainWindow(parent){  //首先设定标题  setWindowTitle(tr("my word"));  //创建放图像的label和文本输入的地方,把这个设置为中心部件  showWidget = new ShowWidget(this);    //创建一个对象  setCentralWidget(showWidget);   //把这个设置为中心部件  //排序下拉框的初始化  listLabel = new QLabel(tr("paixu:"));   //排序  listComboBox = new QComboBox;  listComboBox->addItem("Standard");      //标准  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");  //事件的关联  connect(listComboBox, SIGNAL(activated(int)), this, SLOT(ShowList(int)));   //选择的下拉排序的第几个，然后在相应的显示//  qDebug()<<"11111111111111";  //创建有关字体的部件  //在工具栏上嵌入控件  //设置字体  fontLabel1 = new QLabel(tr("font:"));   //字体标签  fontComboBox = new QFontComboBox;   //字体选项下拉  fontComboBox->setFontFilters(QFontComboBox::ScalableFonts);   //显示所有的可缩放的字体  //字号  fontLabel2 = new QLabel(tr("size:"));   //字号  sizeComboBox = new QComboBox;  QFontDatabase db;   //实现在字号下拉列表框中填充各种不同的字号条目，这个类用于表示当前系统中所有可用的格式信息  foreach(int size, db.standardSizes())   //第二个参数返回可用标准字号的列表    {      sizeComboBox->addItem(QString::number(size)); //QString::number(int size, int base)第二个参数表示这个返回base进制的数    }  //粗体  boldBtn = new QToolButton;  boldBtn->setIcon(QIcon(":/bold.png"));  boldBtn->setCheckable(true);    //默认选择  //斜体  italicBtn = new QToolButton;  italicBtn->setIcon(QIcon(":/italic.png"));  italicBtn->setCheckable(true);  //下划线  underlineBtn = new QToolButton;  underlineBtn->setIcon(QIcon(":/underline.png"));  underlineBtn->setCheckable(true);  //颜色  colorBtn = new QToolButton;  colorBtn->setIcon(QIcon(":/color.png"));  colorBtn->setCheckable(true);  createActions();      //创建动作//  qDebug()<<"222222222222222222";  createMenus();    //创建菜单  //  qDebug()<<"3333333333333333";  createToolBars();   //工具//  qDebug()<<"......";  //相应的槽函数的连接  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(QTextCharFormat&)));  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()));  //如果图像加载成功  if(img.load(":/image.png"))    {      //在imageLabel中放图像      showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));    }}//实现文本的排序void ImageProcessor::ShowList(int index){  QTextCursor cursor = showWidget->text->textCursor();  if(index != 0)    {      QTextListFormat::Style style = QTextListFormat::ListDisc;   //默认排序是这个      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;        }      cursor.beginEditBlock();    //开始设置缩进值      //这个显示格式化的信息      QTextBlockFormat blockFmt = cursor.blockFormat();   //后面这个返回光标选定的段落格式      QTextListFormat listFmt;      if(cursor.currentList())    //判断当前是否有选中格式        {          listFmt = cursor.currentList()->format();   //设定格式        }      else        {          listFmt.setIndent(blockFmt.indent() + 1);   //设定缩进值          blockFmt.setIndent(0);    //设定段落缩进为0          cursor.setBlockFormat(blockFmt);      //设定实现        }      listFmt.setStyle(style);    //设定格式      cursor.endEditBlock();    //结束设置    }  else    {      QTextBlockFormat bfmt;      bfmt.setObjectIndex(-1);      cursor.mergeBlockFormat(bfmt);    }}//实现段落的对齐void ImageProcessor::ShowAlignment(QAction *act){  if(act == leftAction)    showWidget->text->setAlignment(Qt::AlignLeft);    //接受到相应的信号应用到文本上  if(act == rightAction)    showWidget->text->setAlignment(Qt::AlignRight);  if(act == centerAction)    showWidget->text->setAlignment(Qt::AlignCenter);  if(act == justifyAction)    showWidget->text->setAlignment(Qt::AlignJustify);}//把对应的状态显示在工具栏上void ImageProcessor::ShowCursorPositionChanged(){  if(showWidget->text->alignment() == Qt::AlignLeft)    leftAction->setChecked(true);   //改变为选中状态  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);}//工具栏的实现void ImageProcessor::createToolBars(){  //排序工具条  listToolBar = addToolBar("list");  listToolBar->addWidget(listLabel);  listToolBar->addWidget(listComboBox);  listToolBar->addSeparator();  listToolBar->addActions(actGrp->actions());   //把整个组都添加进去  //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->addAction(aboutAction);  zoomTool->addSeparator(); //分隔符  zoomTool->addAction(zoomInAction);  zoomTool->addAction(zoomOutAction);  //旋转工具  rotateTool = addToolBar("rotate");  rotateTool->addAction(rotate90Action);  rotateTool->addAction(rotate180Action);  rotateTool->addAction(rotate270Action);  //撤销和重做  doToolBar = addToolBar("doEdit");  doToolBar->addAction(undoAction);  doToolBar->addAction(redoAction);  //文字的工具栏  fontToolBar = addToolBar("Font");  fontToolBar->addWidget(fontLabel1);   //字体  fontToolBar->addWidget(fontComboBox);     //字体下拉框  fontToolBar->addWidget(fontLabel2);   //字号  fontToolBar->addWidget(sizeComboBox);   //字号下拉  fontToolBar->addSeparator();    //分割线  fontToolBar->addWidget(boldBtn);    //加粗  fontToolBar->addWidget(italicBtn);    //斜  fontToolBar->addWidget(underlineBtn);   //下划线  fontToolBar->addSeparator();  fontToolBar->addWidget(colorBtn);   //颜色  fileTool->setAllowedAreas(Qt::TopToolBarArea|Qt::LeftToolBarArea);}//设置字符格式//当光标所在的字符格式改变的时候，调用这个函数，这个函数根据新的格式将工具栏上的控件显示更新void ImageProcessor::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());}//设置颜色void ImageProcessor::ShowColorBtn(){  QColor color = QColorDialog::getColor(Qt::red, this);   //第一个参数指定默认选择的颜色，第二个定义了标准对话框的父窗口  if(color.isValid())    {      QTextCharFormat fmt;      fmt.setForeground(color);   //设置颜色      showWidget->text->mergeCurrentCharFormat(fmt);    }}//下划线void ImageProcessor::ShowUnderlineBtn(){  QTextCharFormat fmt;  fmt.setFontUnderline(underlineBtn->isChecked());  showWidget->text->mergeCurrentCharFormat(fmt);}//设置字体倾斜void ImageProcessor::ShowItalicBtn(){  QTextCharFormat fmt;  fmt.setFontItalic(italicBtn->isChecked());  showWidget->text->mergeCurrentCharFormat(fmt);}//设置文字加粗void ImageProcessor::ShowBoldBtn(){  QTextCharFormat fmt;  fmt.setFontWeight(boldBtn->isChecked()?QFont::Bold:QFont::Normal);  showWidget->text->mergeCurrentCharFormat(fmt);    //应用进去}//设置字号void ImageProcessor::ShowSizeSpinBox(QString spinValue){  QTextCharFormat fmt; //文体字符格式  fmt.setFontPointSize(spinValue.toFloat());    //设置字体大小  showWidget->text->mergeCurrentCharFormat(fmt);//将新的格式应用到光标选区内的字符}//设置字体void ImageProcessor::ShowFontComboBox(QString comboStr){  QTextCharFormat fmt;    //文体字符格式  fmt.setFontFamily(comboStr);    //选择的字体名称设置给QTextCharFormat  mergeFormat(fmt);   //将新的格式应用到光标选区内的字符}//通过QTextCursor来对QTextDocument进行修改void ImageProcessor::mergeFormat(QTextCharFormat format){  QTextCursor cursor = showWidget->text->textCursor();    //得到这个类  if(!cursor.hasSelection())    //若光标没有高亮选区，则把光标所在的词作为选区，以空格或“，”或“。”等标点符号分割    cursor.select(QTextCursor::WordUnderCursor);  cursor.mergeCharFormat(format);   //把格式应用到光标所在的字符上  showWidget->text->mergeCurrentCharFormat(format);   //调用这个函数将格式应用到选区内的所有字符上}//菜单的实现void ImageProcessor::createMenus(){  //文件菜单  fileMenu = menuBar()->addMenu(tr("file"));  fileMenu->addAction(openFileAction);  fileMenu->addAction(NewFileAction);  fileMenu->addAction(PrintTextAction);  fileMenu->addAction(PrintImageAction);  fileMenu->addSeparator(); //分隔符  fileMenu->addAction(exitAction);  //缩放菜单  zoomMenu = menuBar()->addMenu(tr("zoom"));  //缩放  zoomMenu->addAction(copyAction);  zoomMenu->addAction(cutAction);  zoomMenu->addAction(pasteAction);  zoomMenu->addAction(aboutAction);  zoomMenu->addSeparator(); //分隔符  zoomMenu->addAction(zoomInAction);  zoomMenu->addAction(zoomOutAction);  //旋转菜单  rotateMenu = menuBar()->addMenu(tr("rotate"));  rotateMenu->addAction(rotate90Action);  rotateMenu->addAction(rotate180Action);  rotateMenu->addAction(rotate270Action);  //镜像菜单  mirrorMenu = menuBar()->addMenu(tr("mirror"));  mirrorMenu->addAction(mirrorVerticalAction);  mirrorMenu->addAction(mirrorHorizontalAction);}//动作的实现void ImageProcessor::createActions(){  //排版的各种操作的触发事件  actGrp = new QActionGroup(this);      //创建一个action组  leftAction = new QAction(QIcon(":/left.png"), "left", actGrp);    //左对齐的图标  leftAction->setCheckable(true);   //设定按钮是否可以选定  rightAction = new QAction(QIcon(":/right.png"), "right", actGrp);   //右对齐  rightAction->setCheckable(true);  centerAction = new QAction(QIcon(":/center.png"), "center", actGrp);   //居中对齐  centerAction->setCheckable(true);  justifyAction = new QAction(QIcon(":/justify.png"), "justify", actGrp);   //两端对齐  justifyAction->setCheckable(true);  connect(actGrp, SIGNAL(triggered(QAction*)), this, SLOT(ShowAlignment(QAction*)));    //接受选择的action然后显示相应的结果  //打开动作//  qDebug()<<"11111111111111";  openFileAction = new QAction(QIcon(":/open.png"), tr("open"), this);    //设置图片，名字  openFileAction->setShortcut(tr("Ctrl+O"));    //设置快捷键  openFileAction->setStatusTip(tr("open a file"));    //设置提示//  qDebug()<<"222222222222222222";//  connect(NewFileAction, SIGNAL(triggered()), this, SLOT(ShowNewFile()));   //连接上相应的槽  connect(openFileAction, SIGNAL(triggered()), this, SLOT(ShowOpenFile()));  //新建动作  NewFileAction = new QAction(QIcon(":/new.png"), tr("new"), this);    //设置图片，名字  NewFileAction->setShortcut(tr("Ctrl+N"));    //设置快捷键  NewFileAction->setStatusTip(tr("new a file"));    //设置提示  connect(NewFileAction, SIGNAL(triggered()), this, SLOT(ShowNewFile()));   //连接上相应的槽  //退出动作  exitAction = new QAction(tr("out"), this);    //设置图片，名字  exitAction->setShortcut(tr("Ctrl+Q"));    //设置快捷键  exitAction->setStatusTip(tr("close"));    //设置提示  connect(exitAction, SIGNAL(triggered()), this, SLOT(close()));  //复制  copyAction = new QAction(QIcon(":/copy.png"), tr("out"), this);    //设置图片，名字  copyAction->setShortcut(tr("Ctrl+C"));    //设置快捷键  copyAction->setStatusTip(tr("copy file"));    //设置提示  connect(copyAction, SIGNAL(triggered()), showWidget->text, SLOT(copy()));  //剪切  cutAction = new QAction(QIcon(":/cut.png"), tr("cut"), this);    //设置图片，名字  cutAction->setShortcut(tr("Ctrl+X"));    //设置快捷键  cutAction->setStatusTip(tr("cut file"));    //设置提示  connect(copyAction, SIGNAL(triggered()), showWidget->text, SLOT(cut()));  //粘贴  pasteAction = new QAction(QIcon(":/paste.png"), tr("paste"), this);    //设置图片，名字  pasteAction->setShortcut(tr("Ctrl+V"));    //设置快捷键  pasteAction->setStatusTip(tr("paste file"));    //设置提示  connect(copyAction, SIGNAL(triggered()), showWidget->text, SLOT(paste()));  //关于//  QApplication *app;  aboutAction = new QAction(tr("about"), this);  connect(aboutAction, SIGNAL(triggered()), this, SLOT(QApplication::aboutQt()));  //打印文本  PrintTextAction = new QAction(QIcon(":/printText.png"), tr("printtext"), this);  PrintTextAction->setStatusTip(tr("print a text"));  connect(PrintTextAction, SIGNAL(triggered()), this, SLOT(ShowPrintText()));   //连接相应的动作  //打印图像  PrintImageAction = new QAction(QIcon(":/printImage.png"), tr("printImage"), this);  PrintImageAction->setStatusTip(tr("print a image"));  connect(PrintImageAction, SIGNAL(triggered()), this, SLOT(ShowPrintImage()));  //放大图像  zoomInAction = new QAction(QIcon(":/zoomin.png"), tr("get big"), this);  zoomInAction->setStatusTip(tr("get big image"));  connect(zoomInAction, SIGNAL(triggered()), this, SLOT(ShowZoomIn())); //进行图片放大  //缩小  zoomOutAction = new QAction(QIcon(":/zoomout.png"), tr("get small"), this);  zoomOutAction->setStatusTip(tr("get small image"));  connect(zoomOutAction, SIGNAL(triggered()), this, SLOT(ShowZoomOut())); //进行图片放小  //实现图片的选择动作  //旋转90°  rotate90Action = new QAction(QIcon(":/rotate90.png"), tr("get rotate90"), this);  rotate90Action->setStatusTip(tr("get rotate90 image"));  connect(rotate90Action, SIGNAL(triggered()), this, SLOT(ShowRotate90()));  //180°  rotate180Action = new QAction(QIcon(":/rotate180.png"), tr("get rotate180"), this);  rotate180Action->setStatusTip(tr("get rotate180 image"));  connect(rotate180Action, SIGNAL(triggered()), this, SLOT(ShowRotate180()));  //270°  rotate270Action = new QAction(QIcon(":/rotate270.png"), tr("get rotate270"), this);  rotate270Action->setStatusTip(tr("get rotate270 image"));  connect(rotate270Action, SIGNAL(triggered()), this, SLOT(ShowRotate270()));  //实现图像镜像的动作  //纵向  mirrorVerticalAction = new QAction(QIcon("mirrorVertical.png"), tr("mirrorVertical"), this);  mirrorVerticalAction->setStatusTip(tr("mirrorVertical the image"));  connect(mirrorVerticalAction, SIGNAL(triggered()), this, SLOT(ShowMirrorVertical()));  //横向  mirrorHorizontalAction = new QAction(QIcon("mirrorHorizontal.png"), tr("mirrorHorizontal"), this);  mirrorHorizontalAction->setStatusTip(tr("mirrorHorizontal the image"));  connect(mirrorHorizontalAction, SIGNAL(triggered()), this, SLOT(ShowMirrorHorizontal()));  //实现撤销和恢复的动作  //撤销和恢复  undoAction = new QAction(QIcon(":/undo.png"), "undo", this);    //撤销  connect(undoAction, SIGNAL(triggered()), showWidget->text, SLOT(undo()));  redoAction = new QAction(QIcon(":/redo.png"), "redo", this);    //重做  connect(undoAction, SIGNAL(triggered()), showWidget->text, SLOT(redo()));}//水平镜像void ImageProcessor::ShowMirrorHorizontal(){  if(img.isNull())    return;  img = img.mirrored(true, false);    //水平镜像  showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));}//垂直镜像void ImageProcessor::ShowMirrorVertical(){  if(img.isNull())    return;  img = img.mirrored(false, true);    //垂直镜像  showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));}//旋转270度void ImageProcessor::ShowRotate270(){  if(img.isNull())    return;  QMatrix matrix;  matrix.rotate(270);    //旋转90度  img = img.transformed(matrix);    //图像旋转之后再重新得到赋值  showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));}//旋转180度void ImageProcessor::ShowRotate180(){  if(img.isNull())    return;  QMatrix matrix;  matrix.rotate(180);    //旋转90度  img = img.transformed(matrix);    //图像旋转之后再重新得到赋值  showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));}//旋转90度void ImageProcessor::ShowRotate90(){  if(img.isNull())    return;  QMatrix matrix;  matrix.rotate(90);    //旋转90度  img = img.transformed(matrix);    //图像旋转之后再重新得到赋值  showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));}//实现图片的放小void ImageProcessor::ShowZoomOut(){  //首先判断是否有照片  if(img.isNull())    return;   //没有照片，那就不用放大了  QMatrix martix;   //一个图片的存放对象  martix.scale(0.5, 0.5);   //长和宽都放小2倍  img = img.transformed(martix);    //对图片的操作落实  showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));   //改变后的图片放回去}//实现图片的放大void ImageProcessor::ShowZoomIn(){  //首先判断是否有照片  if(img.isNull())    return;   //没有照片，那就不用放大了  QMatrix martix;   //一个图片的存放对象  martix.scale(2, 2);   //长和宽都放大2倍  img = img.transformed(martix);    //对图片的操作落实  showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));   //改变后的图片放回去}//实现打印图像功能的函数void ImageProcessor::ShowPrintImage(){  QPrinter printer;  QPrintDialog printDialog(&printer, this);  //是否点击确定  if(printDialog.exec())    {      QPainter painter(&printer);      QRect rect = painter.viewport();    //获得QPainter对象的视角矩形区域      QSize size = img.size();    //图片的尺寸      size.scale(rect.size(), Qt::KeepAspectRatio);      painter.setViewport(rect.x(), rect.y(), size.width(), size.height());   //设置矩形区域      painter.drawImage(0, 0, img);    }}//实现打印文本功能void ImageProcessor::ShowPrintText(){//  QP  QPrinter printer;   //打印  QPrintDialog printDialog(&printer, this);  if(printDialog.exec())    //是否点击确定    {      QTextDocument *doc = showWidget->text->document();    //得到文档对象      doc->print(&printer);   //开始打印    }}//打开文件void ImageProcessor::ShowOpenFile(){  fileName = QFileDialog::getOpenFileName(this);    //得到文件名  if(!fileName.isEmpty())   //文件不为空    {      if(showWidget->text->document()->isEmpty()) //中心部件的内容的根节点不是空        {          loadFile(fileName);   //添加文件        }      else        {          ImageProcessor *newImageProcessor = new ImageProcessor;   //创建一个新的my word文档          newImageProcessor->show();    //显示出来          newImageProcessor->loadFile(fileName);    //添加文件        }    }}//实现loadFile函数,这个文件的处理后面会再次进行学习void ImageProcessor::loadFile(QString filename){  printf("file name:%s\n", filename.data());    //输出文件名  QFile file(filename);  if(file.open(QIODevice::ReadOnly|QIODevice::Text))    {      QTextStream textStream(&file);      while(!textStream.atEnd())    //循环到后面        {          showWidget->text->append(textStream.readLine());    //给文档添加文件          printf("read line\n");        }      printf("end\n");    }}//新建文件槽void ImageProcessor::ShowNewFile(){//  qDebug()<<"????";  ImageProcessor *newImageProcessor = new ImageProcessor;  newImageProcessor->show();    //一个新的文档显示}ImageProcessor::~ImageProcessor(){}

main.cpp

/*** 书本:【Qt5开发及实例】* 功能:实现一个简单的文本编辑器* 文件:showwidget.h* 时间:2015年1月20日11:22:39* 作者:cutter_point*/#include "imageprocessor.h"#include <QApplication>#include <QDebug>int main(int argc, char *argv[]){  QApplication a(argc, argv);  QFont f("ZYSong18030", 12);   //设置字体显示格式  a.setFont(f);  ImageProcessor w;  w.show();  return a.exec();}

3、结果展示

卧槽，我又一张图传不上来，我也是醉了。

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