"QT5 Development and examples" 12. Implement a simple text editor 1

Showwidget.h

/*** Book: "QT5 Development and examples" * Function: Implement a simple text editor * file: showwidget.h* time: January 18, 2015 10:03:21* Author: 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

Showwidget.cpp

/*** Book: "QT5 Development and examples" * Function: Implement a simple text editor * file: showwidget.h* time: January 18, 2015 10:03:21* Author: 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.h

/*** Book: "QT5 Development and examples" * Function: Implement a simple text editor * file: showwidget.h* time: January 18, 2015 10:41:52* Author: 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 ();  Create action void createactions ();  Create menu void Createmenus ();  Creates a toolbar void createtoolbars ();    void LoadFile (QString filename);    Load file void Mergeformat (Qtextcharformat);  Text Format private://menu bar Qmenu *filemenu;  Qmenu *zoommenu;  Qmenu *rotatemenu;  Qmenu *mirrormenu;   Qimage img;     Picture QString FileName;     FileName Showwidget *showwidget;  Display Stream//File menu item qaction *openfileaction; Qaction *nEwfileaction;  Qaction *printtextaction;  Qaction *printimageaction;  Qaction *exitaction;  Edit menu item Qaction *copyaction;  Qaction *cutaction;  Qaction *pasteaction;  Qaction *aboutaction;  Qaction *zoominaction;  Qaction *zoomoutaction;  Rotate menu item qaction *rotate90action;  Qaction *rotate180action;  Qaction *rotate270action;  Mirror menu item Qaction *mirrorverticalaction;  Qaction *mirrorhorizontalaction;  Qaction *undoaction;  Qaction *redoaction;  Toolbar Qtoolbar *filetool;  Qtoolbar *zoomtool;  Qtoolbar *rotatetool;  Qtoolbar *mirrortool;   Qtoolbar *dotoolbar;protected Slots://Add function slot void Shownewfile ();    Create a new file void Showopenfile ();   Open file void Showprinttext ();    Implementation of the Print function void Showprintimage (); print a picture}; #endif//Imageprocessor_h

Imageprocessor.cpp

/*** Book: "QT5 Development and examples" * Function: Implement a simple text editor * file: showwidget.h* time: January 18, 2015 10:41:52* Author: 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>imageprocessor::imageprocessor (qwidget *parent):  Qmainwindow (parent) {//First set the title Setwindowtitle (tr ("My word"));    Create a place to put the label and text input of the image, set this as the central part showwidget = new Showwidget (this);   Create an Object Setcentralwidget (Showwidget);  Set this as the center part//Qdebug () << "11111111111111";      Createactions ();  Create action//Qdebug () << "222222222222222222";    Createmenus ();  Create Menu//Qdebug () << "3333333333333333";   Createtoolbars ();  Tools//Qdebug () << "..."; If the image is loaded successfully if (Img.load (":/image.png")) {//images are placed in Imagelabel Showwidget->imagelabel->setpixmap (qpixmap:: FromImage (IMG));  }}//Toolbar implementation void Imageprocessor::createtoolbars () {//file toolbar Filetool = Addtoolbar ("file");  Filetool->addaction (openfileaction);  Filetool->addaction (newfileaction);  Filetool->addaction (printtextaction);  Filetool->addaction (printimageaction);  Edit Toolbar Zoomtool = Addtoolbar ("edit");  Zoomtool->addaction (copyaction);  Zoomtool->addaction (cutaction);  Zoomtool->addaction (pasteaction);//Zoomtool->addaction (aboutaction); Zoomtool->addseparator ();  Delimiter zoomtool->addaction (zoominaction);  Zoomtool->addaction (zoomoutaction);  Rotary Tool Rotatetool = Addtoolbar ("rotate");  Rotatetool->addaction (rotate90action);  Rotatetool->addaction (rotate180action);  Rotatetool->addaction (rotate270action);  Undo and Redo Dotoolbar = Addtoolbar ("Doedit");  Dotoolbar->addaction (undoaction);  Dotoolbar->addaction (redoaction); Filetool->setallowedareas (qt::toptoolbararea| Qt::lefttoolbararea);} Menu implementation void Imageprocessor::createmenus () {//File menu Filemenu = MeNubar ()->addmenu (tr ("file"));  Filemenu->addaction (openfileaction);  Filemenu->addaction (newfileaction);  Filemenu->addaction (printtextaction);  Filemenu->addaction (printimageaction); Filemenu->addseparator ();  Delimiter filemenu->addaction (exitaction);  Zoom Menu Zoommenu = MenuBar ()->addmenu (tr ("Zoom"));  Scaling zoommenu->addaction (copyaction);  Zoommenu->addaction (cutaction);  Zoommenu->addaction (pasteaction);  Zoommenu->addaction (aboutaction); Zoommenu->addseparator ();  Delimiter zoommenu->addaction (zoominaction);  Zoommenu->addaction (zoomoutaction);  Rotation menu Rotatemenu = MenuBar ()->addmenu (tr ("rotate"));  Rotatemenu->addaction (rotate90action);  Rotatemenu->addaction (rotate180action);  Rotatemenu->addaction (rotate270action);  Mirror Menu Mirrormenu = MenuBar ()->addmenu (tr ("Mirror"));  Mirrormenu->addaction (mirrorverticalaction); Mirrormenu->addaction (mirrorhorizontalaction);} Implementation of the Action void Imageprocessor::createactions () {//Open action//  Qdebug () << "11111111111111";    Openfileaction = new Qaction (Qicon (":/open.png"), tr ("open"), this);    Set the picture, name Openfileaction->setshortcut (tr ("Ctrl+o"));    Set the shortcut key Openfileaction->setstatustip (TR ("Open a File")); Setup tips//Qdebug () << "222222222222222222";//Connect (Newfileaction, SIGNAL (triggered ()), this, SLOT (shownewfile   ()));  Connect the corresponding slot connect (openfileaction, SIGNAL (triggered ()), this, slot (Showopenfile ()));    New Action newfileaction = new Qaction (Qicon (":/new.png"), tr ("new"), this);    Set the picture, name Newfileaction->setshortcut (tr ("CTRL + N"));    Set the shortcut key Newfileaction->setstatustip (TR ("New A File"));   Settings prompt connect (newfileaction, SIGNAL (triggered ()), this, SLOT (Shownewfile ()));    Connect the corresponding Slot//exit action exitaction = new Qaction (tr ("Out"), this);    Set the picture, name Exitaction->setshortcut (tr ("Ctrl+q"));    Set the shortcut key Exitaction->setstatustip (tr ("close"));  Set prompt for connect (exitaction, SIGNAL (triggered ()), this, SLOT (Close ())); Copy copyaction = new QactioN (Qicon (":/copy.png"), tr ("Out"), this);    Set the picture, name Copyaction->setshortcut (tr ("CTRL + C"));    Set the shortcut key Copyaction->setstatustip (tr ("Copy File"));  Settings prompt for connect (copyaction, SIGNAL (triggered ()), Showwidget->text, SLOT (copy ()));    Cut cutaction = new Qaction (Qicon (":/cut.png"), tr ("Cut"), this);    Set the picture, name Cutaction->setshortcut (tr ("ctrl+x"));    Set the shortcut key Cutaction->setstatustip (tr ("Cut file"));  Settings prompt connect (copyaction, SIGNAL (triggered ()), Showwidget->text, SLOT (Cut ()));    Paste pasteaction = new Qaction (Qicon (":/paste.png"), tr ("paste"), this);    Set the picture, name Pasteaction->setshortcut (tr ("Ctrl + V"));    Set the shortcut key Pasteaction->setstatustip (tr ("Paste file"));  Settings prompt for connect (copyaction, SIGNAL (triggered ()), Showwidget->text, SLOT (paste ()));  About//Qapplication *app;  Aboutaction = new Qaction (tr ("about"), this);  Connect (aboutaction, SIGNAL (triggered ()), this, SLOT (QAPPLICATION::ABOUTQT ())); Print text printtextaction = new Qaction (Qicon (":/printText.png "), tr (" Printtext "), this);  Printtextaction->setstatustip (TR ("Print a Text"));   Connect (printtextaction, SIGNAL (triggered ()), this, SLOT (Showprinttext ()));  Connect the corresponding action//print image printimageaction = new Qaction (Qicon (":/printimage.png"), tr ("Printimage"), this);  Printimageaction->setstatustip (TR ("Print a Image"));  Connect (printimageaction, SIGNAL (triggered ()), this, SLOT (Showprintimage ()));  Enlarge image zoominaction = new Qaction (Qicon (":/zoomin.png"), tr ("Get Big"), this);  Zoominaction->setstatustip (tr ("Get Big Image"));  Reduce zoomoutaction = new Qaction (Qicon (":/zoomout.png"), tr ("Get Small"), this);  Zoomoutaction->setstatustip (tr ("Get small Image"));  Implementation of the image selection action//Rotation 90°rotate90action = new Qaction (Qicon (":/rotate90.png"), tr ("Get Rotate90"), this);  Rotate90action->setstatustip (tr ("Get Rotate90 image"));  180°rotate180action = new Qaction (Qicon (":/rotate180.png"), tr ("Get rotate180"), this); Rotate180action->setstatustip (tr ("Get rotate180 image")); 270°rotate270action = new Qaction (Qicon (":/rotate270.png"), tr ("Get rotate270"), this);  Rotate270action->setstatustip (tr ("Get rotate270 image"));  Implementation of image Mirroring action//Portrait mirrorverticalaction = new Qaction (Qicon ("Mirrorvertical.png"), tr ("Mirrorvertical"), this);  Mirrorverticalaction->setstatustip (TR ("mirrorvertical the image");  Transverse mirrorhorizontalaction = new Qaction (Qicon ("Mirrorhorizontal.png"), tr ("Mirrorhorizontal"), this);  Mirrorhorizontalaction->setstatustip (TR ("Mirrorhorizontal the image");    Implement undo and redo actions//undo and redo UndoAction = new Qaction (Qicon (":/undo.png"), "undo", this);  Revoke Connect (undoaction, SIGNAL (triggered ()), Showwidget->text, SLOT (undo ()));    RedoAction = new Qaction (Qicon (":/redo.png"), "Redo", this); Redo Connect (undoaction, SIGNAL (triggered ()), Showwidget->text, SLOT (Redo ()));}  Functions that implement the print image function void Imageprocessor::showprintimage () {Qprinter printer;  Qprintdialog PrintDialog (&printer, this);   Whether to click OK if (Printdialog.exec ()) {   qpainter painter (&printer);    Qrect rect = Painter.viewport ();    Gets the perspective rectangle area of the Qpainter object qsize size = Img.size ();      The size of the picture Size.scale (Rect.size (), qt::keepaspectratio);   Painter.setviewport (Rect.x (), Rect.y (), Size.width (), Size.Height ());    Set Rectangular area painter.drawimage (0, 0, IMG);   }}//Implement print text function void Imageprocessor::showprinttext () {//QP Qprinter printer;  Print Qprintdialog PrintDialog (&printer, this);    if (printdialog.exec ())//Whether click OK {qtextdocument *doc = showwidget->text->document ();   Get the Document Object Doc->print (&printer);    Start printing}}//open file void Imageprocessor::showopenfile () {fileName = Qfiledialog::getopenfilename (this);         Get the file name if (!filename.isempty ())//file is not empty {if (Showwidget->text->document ()->isempty ())//The root node of the content of the central part is not empty   {loadFile (fileName);   Add File} else {imageprocessor *newimageprocessor = new Imageprocessor; Create a new My Word document NewImageProcessor->show ();    Show out Newimageprocessor->loadfile (FileName); Add File}}}//implements the LoadFile function, which will be learned again after processing void imageprocessor::loadfile (QString filename) {printf ("File name:%s    \ n ", Filename.data ());  Output file name QFile file (filename); if (File.Open (qiodevice::readonly|      Qiodevice::text)) {Qtextstream textstream (&file);    while (!textstream.atend ())//loop to the back {Showwidget->text->append (Textstream.readline ());        Add a file to the document printf ("Read line\n");    } printf ("end\n");  }}//new file slot void Imageprocessor::shownewfile () {//Qdebug () << "????";  Imageprocessor *newimageprocessor = new Imageprocessor;    Newimageprocessor->show (); A new document displays}imageprocessor::~imageprocessor () {}

Main.cpp

#include "imageprocessor.h" #include <QApplication> #include <qdebug>int main (int argc, char *argv[]) {  Qapplication A (argc, argv);  Imageprocessor W;  W.show ();  return a.exec ();}

Imageprocessor.pro

#-------------------------------------------------# # Project created by Qtcreator 2015-01-18t10:01:31##------------ -------------------------------------QT       + + core GUIQT + = Printsupportgreaterthan (Qt_major_version, 4): qt + = Widgetstarget = Imageprocessortemplate = appsources + = main.cpp        imageprocessor.cpp     showwidget.cppheaders  + = Imageprocessor.h     showwidget.hresources + =     IMAGES.QRC

Operation Result:

Hey, after the test, it should be normal point, and now is slowly adjusting.

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"QT5 Development and examples" 12. Implement a simple text editor 1