基于QT的文本编辑器程序源代码

附录
文本编辑器代码
textedit.pro
TEMPLATE = app
TARGET = textedit
CONFIG += qt warn_on
HEADERS = textedit.h
SOURCES = textedit.cpp \
main.cpp
RESOURCES += textedit.qrc
build_all:!build_pass {
CONFIG -= build_all
CONFIG += release
}
# install
target.path = $$[QT_INSTALL_DEMOS]/textedit
sources.files = $$SOURCES $$HEADERS $$RESOURCES *.pro *.html *.doc images
sources.path = $$[QT_INSTALL_DEMOS]/textedit
INSTALLS += target sources
textedit.h
#ifndef TEXTEDIT_H
#define TEXTEDIT_H
#include <QMainWindow>
#include <QMap>
#include <QPointer>
QT_FORWARD_DECLARE_CLASS(QAction)
QT_FORWARD_DECLARE_CLASS(QComboBox)
QT_FORWARD_DECLARE_CLASS(QFontComboBox)
QT_FORWARD_DECLARE_CLASS(QTextEdit)
QT_FORWARD_DECLARE_CLASS(QTextCharFormat) QT_FORWARD_DECLARE_CLASS(QMenu)
class TextEdit : public QMainWindow
{
Q_OBJECT
public:
TextEdit(QWidget *parent = 0);
protected:
virtual void closeEvent(QCloseEvent *e); private:
void setupFileActions();
void setupEditActions();
void setupTextActions();
bool load(const QString &f);
bool maybeSave();
void setCurrentFileName(const QString &fileName);
private slots:
void fileNew();
void fileOpen();
bool fileSave();
bool fileSaveAs();
void filePrint();
void filePrintPreview();
void filePrintPdf();
void textBold();
void textUnderline();
void textItalic();
void textFamily(const QString &f);
void textSize(const QString &p);
void textStyle(int styleIndex);
void textColor();
void textAlign(QAction *a);
void currentCharFormatChanged(const QTextCharFormat &format);
void cursorPositionChanged();
void clipboardDataChanged();
void about();
void printPreview(QPrinter *);
private:
void mergeFormatOnWordOrSelection(const QTextCharFormat &format);
void fontChanged(const QFont &f);
void colorChanged(const QColor &c);
void alignmentChanged(Qt::Alignment a);
QAction *actionSave,
*actionTextBold,
*actionTextUnderline,
*actionTextItalic,
*actionTextColor,
*actionAlignLeft,
*actionAlignCenter,
*actionAlignRight,
*actionAlignJustify,
*actionUndo,
*actionRedo,
*actionCut,
*actionCopy,
*actionPaste;
QComboBox *comboStyle;
QFontComboBox *comboFont;
QComboBox *comboSize;
QToolBar *tb;
QString fileName;
QTextEdit *textEdit;
};
#endif
main.cpp
#include "textedit.h"
#include <QApplication>
int main( int argc, char ** argv ) {
Q_INIT_RESOURCE(textedit);
QApplication a( argc, argv );
TextEdit mw;
mw.resize( 700, 800 );
mw.show();
return a.exec();
}
textedit.cpp
#include "textedit.h"
#include <QAction>
#include <QApplication>
#include <QClipboard>
#include <QColorDialog>
#include <QComboBox>
#include <QFontComboBox>
#include <QFile>
#include <QFileDialog>
#include <QFileInfo>
#include <QFontDatabase>
#include <QMenu>
#include <QMenuBar>
#include <QPrintDialog>
#include <QPrinter>
#include <QTextCodec>
#include <QTextEdit>
#include <QToolBar>
#include <QTextCursor>
#include <QTextList>
#include <QtDebug>
#include <QCloseEvent>
#include <QMessageBox>
#include <QPrintPreviewDialog>
#include <QTextCodec>
#ifdef Q_WS_MAC
const QString rsrcPath = ":/images/mac";
#else
const QString rsrcPath = ":/images/win";
#endif
TextEdit::TextEdit(QWidget *parent)
: QMainWindow(parent)
{
this->setWindowTitle(QString("文本编辑器"));
QTextCodec::setCodecForCStrings(QTextCodec::codecForName("UTF-8"));
setupFileActions();
setupEditActions();
setupTextActions();
{
QMenu *helpMenu = new QMenu("帮助", this);
menuBar()->addMenu(helpMenu);
helpMenu->addAction("关于", this, SLOT(about()));
helpMenu->addAction("关于&Qt", qApp, SLOT(aboutQt()));
}
textEdit = new QTextEdit(this);
connect(textEdit, SIGNAL(currentCharFormatChanged(const QTextCharFormat &)),
this, SLOT(currentCharFormatChanged(const QTextCharFormat &)));
connect(textEdit, SIGNAL(cursorPositionChanged()),
this, SLOT(cursorPositionChanged()));
setCentralWidget(textEdit);
textEdit->setFocus();
setCurrentFileName(QString());
fontChanged(textEdit->font());
colorChanged(textEdit->textColor());
alignmentChanged(textEdit->alignment());
connect(textEdit->document(), SIGNAL(modificationChanged(bool)),
actionSave, SLOT(setEnabled(bool)));
connect(textEdit->document(), SIGNAL(modificationChanged(bool)),
this, SLOT(setWindowModified(bool)));
connect(textEdit->document(), SIGNAL(undoAvailable(bool)),
actionUndo, SLOT(setEnabled(bool)));
connect(textEdit->document(), SIGNAL(redoAvailable(bool)),
actionRedo, SLOT(setEnabled(bool)));
setWindowModified(textEdit->document()->isModified());
actionSave->setEnabled(textEdit->document()->isModified());
actionUndo->setEnabled(textEdit->document()->isUndoAvailable());
actionRedo->setEnabled(textEdit->document()->isRedoAvailable());
connect(actionUndo, SIGNAL(triggered()), textEdit, SLOT(undo()));
connect(actionRedo, SIGNAL(triggered()), textEdit, SLOT(redo()));
actionCut->setEnabled(false);
actionCopy->setEnabled(false);
connect(actionCut, SIGNAL(triggered()), textEdit, SLOT(cut()));
connect(actionCopy, SIGNAL(triggered()), textEdit, SLOT(copy()));
connect(actionPaste, SIGNAL(triggered()), textEdit, SLOT(paste()));
connect(textEdit, SIGNAL(copyAvailable(bool)), actionCut, SLOT(setEnabled(bool)));
connect(textEdit, SIGNAL(copyAvailable(bool)), actionCopy, SLOT(setEnabled(bool)));
connect(QApplication::clipboard(), SIGNAL(dataChanged()), this, SLOT(clipboardDataChanged()));
QString initialFile = "文本编辑器";
const QStringList args = QCoreApplication::arguments();
if (args.count() == 2)
initialFile = args.at(1);
if (!load(initialFile))
fileNew();
}
void TextEdit::closeEvent(QCloseEvent *e)
{
if (maybeSave())
e->accept();
else
e->ignore();
}
void TextEdit::setupFileActions()
{
QToolBar *tb = new QToolBar(this);
tb->setWindowTitle(tr("File Actions"));
addToolBar(tb);
QMenu *menu = new QMenu("&文件", this);
menuBar()->addMenu(menu);
QAction *a;
a = new QAction(QIcon(rsrcPath + "/filenew.png"), "&新建", this);
a->setShortcut(QKeySequence::New);
connect(a, SIGNAL(triggered()), this, SLOT(fileNew()));
tb->addAction(a);
menu->addAction(a);
a = new QAction(QIcon(rsrcPath + "/fileopen.png"), "&打开", this);
a->setShortcut(QKeySequence::Open);
connect(a, SIGNAL(triggered()), this, SLOT(fileOpen()));
tb->addAction(a);
menu->addAction(a);
menu->addSeparator();
actionSave = a = new QAction(QIcon(rsrcPath + "/filesave.png"), "&保存", this);
a->setShortcut(QKeySequence::Save);
connect(a, SIGNAL(triggered()), this, SLOT(fileSave()));
a->setEnabled(false);
tb->addAction(a);
menu->addAction(a);
a = new QAction("&另存为.", this);
connect(a, SIGNAL(triggered()), this, SLOT(fileSaveAs()));
menu->addAction(a);
menu->addSeparator();
a = new QAction(QIcon(rsrcPath + "/fileprint.png"), "&打印", this);
a->setShortcut(QKeySequence::Print);
connect(a, SIGNAL(triggered()), this, SLOT(filePrint()));
tb->addAction(a);
menu->addAction(a);
a = new QAction(QIcon(rsrcPath + "/fileprint.png"), "&打印预览", this);
connect(a, SIGNAL(triggered()), this, SLOT(filePrintPreview()));
menu->addAction(a);
a = new QAction(QIcon(rsrcPath + "/exportpdf.png"), "&转换为PDF...", this);
a->setShortcut(Qt::CTRL + Qt::Key_D);
connect(a, SIGNAL(triggered()), this, SLOT(filePrintPdf()));
tb->addAction(a);
menu->addAction(a);
menu->addSeparator();
a = new QAction("&退出", this);
a->setShortcut(Qt::CTRL + Qt::Key_Q);
connect(a, SIGNAL(triggered()), this, SLOT(close()));
menu->addAction(a);
}
void TextEdit::setupEditActions()
{
QToolBar *tb = new QToolBar(this);
tb->setWindowTitle(tr("Edit Actions"));
addToolBar(tb);
QMenu *menu = new QMenu("&编辑", this);
menuBar()->addMenu(menu);
QAction *a;
a = actionUndo = new QAction(QIcon(rsrcPath + "/editundo.png"),"&撤销", this);
a->setShortcut(QKeySequence::Undo);
tb->addAction(a);
menu->addAction(a);
a = actionRedo = new QAction(QIcon(rsrcPath + "/editredo.png"), "&恢复", this);
a->setShortcut(QKeySequence::Redo);
tb->addAction(a);
menu->addAction(a);
menu->addSeparator();
a = actionCut = new QAction(QIcon(rsrcPath + "/editcut.png"), "&剪切", this);
a->setShortcut(QKeySequence::Cut);
tb->addAction(a);
menu->addAction(a);
a = actionCopy = new QAction(QIcon(rsrcPath + "/editcopy.png"), "&复制", this);
a->setShortcut(QKeySequence::Copy);
tb->addAction(a);
menu->addAction(a);
a = actionPaste = new QAction(QIcon(rsrcPath + "/editpaste.png"), "&粘贴", this);
a->setShortcut(QKeySequence::Paste);
tb->addAction(a);
menu->addAction(a);
actionPaste->setEnabled(!QApplication::clipboard()->text().isEmpty());
}
void TextEdit::setupTextActions()
{
QToolBar *tb = new QToolBar(this);
tb->setWindowTitle(tr("Format Actions"));
addToolBar(tb);
QMenu *menu = new QMenu("&格式", this);
menuBar()->addMenu(menu);
actionTextBold = new QAction(QIcon(rsrcPath + "/textbold.png"), "&加粗", this);
actionTextBold->setShortcut(Qt::CTRL + Qt::Key_B);
QFont bold;
bold.setBold(true);
actionTextBold->setFont(bold);
connect(actionTextBold, SIGNAL(triggered()), this, SLOT(textBold()));
tb->addAction(actionTextBold);
menu->addAction(actionTextBold);
actionTextBold->setCheckable(true);
actionTextItalic = new QAction(QIcon(rsrcPath + "/textitalic.png"), "&斜体", this);
actionTextItalic->setShortcut(Qt::CTRL + Qt::Key_I);
QFont italic;
italic.setItalic(true);
actionTextItalic->setFont(italic);
connect(actionTextItalic, SIGNAL(triggered()), this, SLOT(textItalic()));
tb->addAction(actionTextItalic);
menu->addAction(actionTextItalic);
actionTextItalic->setCheckable(true);
actionTextUnderline = new QAction(QIcon(rsrcPath + "/textunder.png"), "&下划线", this);
actionTextUnderline->setShortcut(Qt::CTRL + Qt::Key_U);
QFont underline;
underline.setUnderline(true);
actionTextUnderline->setFont(underline);
connect(actionTextUnderline, SIGNAL(triggered()), this, SLOT(textUnderline()));
tb->addAction(actionTextUnderline);
menu->addAction(actionTextUnderline);
actionTextUnderline->setCheckable(true);
menu->addSeparator();
QActionGroup *grp = new QActionGroup(this);
connect(grp, SIGNAL(triggered(QAction *)), this, SLOT(textAlign(QAction *)));
actionAlignLeft = new QAction(QIcon(rsrcPath + "/textleft.png"), "&左对齐", grp);
actionAlignLeft->setShortcut(Qt::CTRL + Qt::Key_L);
actionAlignLeft->setCheckable(true);
actionAlignCenter = new QAction(QIcon(rsrcPath + "/textcenter.png"), "&中间对齐", grp);
actionAlignCenter->setShortcut(Qt::CTRL + Qt::Key_E);
actionAlignCenter->setCheckable(true);
actionAlignRight = new QAction(QIcon(rsrcPath + "/textright.png"), "&右对齐",
grp);
actionAlignRight->setShortcut(Qt::CTRL + Qt::Key_R);
actionAlignRight->setCheckable(true);
actionAlignJustify = new QAction(QIcon(rsrcPath + "/textjustify.png"), "&整理", grp);
actionAlignJustify->setShortcut(Qt::CTRL + Qt::Key_J);
actionAlignJustify->setCheckable(true);
tb->addActions(grp->actions());
menu->addActions(grp->actions());
menu->addSeparator();
QPixmap pix(16, 16);
pix.fill(Qt::black);
actionTextColor = new QAction(pix, "&字体颜色.", this);
connect(actionTextColor, SIGNAL(triggered()), this, SLOT(textColor()));
tb->addAction(actionTextColor);
menu->addAction(actionTextColor);
tb = new QToolBar(this);
tb->setAllowedAreas(Qt::TopToolBarArea | Qt::BottomToolBarArea);
tb->setWindowTitle(tr("Format Actions"));
addToolBarBreak(Qt::TopToolBarArea);
addToolBar(tb);
comboStyle = new QComboBox(tb);
tb->addWidget(comboStyle);
comboStyle->addItem("Standard");
comboStyle->addItem("Bullet List (Disc)");
comboStyle->addItem("Bullet List (Circle)");
comboStyle->addItem("Bullet List (Square)");
comboStyle->addItem("Ordered List (Decimal)");
comboStyle->addItem("Ordered List (Alpha lower)");
comboStyle->addItem("Ordered List (Alpha upper)");
connect(comboStyle, SIGNAL(activated(int)),
this, SLOT(textStyle(int)));
comboFont = new QFontComboBox(tb);
tb->addWidget(comboFont);
connect(comboFont, SIGNAL(activated(const QString &)),
this, SLOT(textFamily(const QString &)));
comboSize = new QComboBox(tb);
comboSize->setObjectName("comboSize");
tb->addWidget(comboSize);
comboSize->setEditable(true);
QFontDatabase db;
foreach(int size, db.standardSizes())
comboSize->addItem(QString::number(size));
connect(comboSize, SIGNAL(activated(const QString &)),
this, SLOT(textSize(const QString &)));
comboSize->setCurrentIndex(comboSize->findText(QString::number(QApplication::f ont()
.p ointSize())));
}
bool TextEdit::load(const QString &f)
{
if (!QFile::exists(f))
return false;
QFile file(f);
if (!file.open(QFile::ReadOnly))
return false;
QByteArray data = file.readAll();
QTextCodec *codec = Qt::codecForHtml(data);
QString str = codec->toUnicode(data);
if (Qt::mightBeRichText(str)) {
textEdit->setHtml(str);
} else {
str = QString::fromLocal8Bit(data);
textEdit->setPlainText(str);
}
setCurrentFileName(f);
return true;
}
bool TextEdit::maybeSave()
{
if (!textEdit->document()->isModified())
return true;
if (fileName.startsWith(QLatin1String(":/")))
return true;
QMessageBox::StandardButton ret;
ret = QMessageBox::warning(this, tr("Application"),
"文件尚未保存，是否保存？",
QMessageBox::Yes | QMessageBox::No
| QMessageBox::Cancel);
if (ret == QMessageBox::Yes)
return fileSave();
else if (ret == QMessageBox::Cancel)
return false;
return true;
void TextEdit::setCurrentFileName(const QString &fileName)
{
this->fileName = fileName;
textEdit->document()->setModified(false);
QString shownName;
if (fileName.isEmpty())
shownName = "我的文本编辑器";
else
shownName = QFileInfo(fileName).fileName();
setWindowTitle(tr("%1[*]").arg(shownName));
setWindowModified(false);
}
void TextEdit::fileNew()
{
if (maybeSave()) {
textEdit->clear();
setCurrentFileName(QString());
}
}
void TextEdit::fileOpen()
{
QString fn = QFileDialog::getOpenFileName(this, tr("Open File..."),
QString(), tr("TXT-Files (*.txt);;All Files (*)"));
if (!fn.isEmpty())
load(fn);
bool TextEdit::fileSave()
{
if (fileName.isEmpty())
return fileSaveAs();
QFile file(fileName);
if (!file.open(QFile::WriteOnly))
return false;
QTextStream ts(&file);
ts.setCodec(QTextCodec::codecForName("UTF-8"));
ts << textEdit->document()->toHtml("UTF-8");
textEdit->document()->setModified(false);
return true;
}
bool TextEdit::fileSaveAs()
{
QString fn = QFileDialog::getSaveFileName(this, tr("Save as..."),
QString(), tr("TXT-Files (*.txt);;All Files (*)"));
if (fn.isEmpty())
return false;
setCurrentFileName(fn);
return fileSave();
}
void TextEdit::filePrint()
{
#ifndef QT_NO_PRINTER
QPrinter printer(QPrinter::HighResolution);
QPrintDialog *dlg = new QPrintDialog(&printer, this);
if (textEdit->textCursor().hasSelection())
dlg->addEnabledOption(QAbstractPrintDialog::PrintSelection);
dlg->setWindowTitle(tr("Print Document"));
if (dlg->exec() == QDialog::Accepted) {
textEdit->print(&printer);
}
delete dlg;
#endif
}
void TextEdit::filePrintPreview()
{
#ifndef QT_NO_PRINTER
QPrinter printer(QPrinter::HighResolution);
QPrintPreviewDialog preview(&printer, this);
connect(&preview, SIGNAL(paintRequested(QPrinter *)), SLOT(printPreview(QPrinter *)));
preview.exec();
#endif
}
void TextEdit::printPreview(QPrinter *printer)
{
#ifdef QT_NO_PRINTER
Q_UNUSED(printer);
#else
textEdit->print(printer);
#endif
}
void TextEdit::filePrintPdf()
{
#ifndef QT_NO_PRINTER
//! [0]
QString fileName = QFileDialog::getSaveFileName(this, " 转换为PDF",
QString(), "*.pdf");
if (!fileName.isEmpty()) {
if (QFileInfo(fileName).suffix().isEmpty())
fileName.append(".pdf");
QPrinter printer(QPrinter::HighResolution);
printer.setOutputFormat(QPrinter::PdfFormat);
printer.setOutputFileName(fileName);
textEdit->document()->print(&printer);
}
//! [0]
#endif
}
void TextEdit::textBold()
{
QTextCharFormat fmt;
fmt.setFontWeight(actionTextBold->isChecked() ? QFont::Bold : QFont::Normal);
mergeFormatOnWordOrSelection(fmt);
}
void TextEdit::textUnderline()
{
QTextCharFormat fmt;
fmt.setFontUnderline(actionTextUnderline->isChecked());
mergeFormatOnWordOrSelection(fmt);
}
void TextEdit::textItalic()
{
QTextCharFormat fmt;
fmt.setFontItalic(actionTextItalic->isChecked());
mergeFormatOnWordOrSelection(fmt);
}
void TextEdit::textFamily(const QString &f)
{
QTextCharFormat fmt;
fmt.setFontFamily(f);
mergeFormatOnWordOrSelection(fmt);
}
void TextEdit::textSize(const QString &p)
{
QTextCharFormat fmt;
fmt.setFontPointSize(p.toFloat());
mergeFormatOnWordOrSelection(fmt);
}
void TextEdit::textStyle(int styleIndex)
{
QTextCursor cursor = textEdit->textCursor();
if (styleIndex != 0) {
QTextListFormat::Style style = QTextListFormat::ListDisc;
switch (styleIndex) {
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;
}
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);
}
}
void TextEdit::textColor()
{
QColor col = QColorDialog::getColor(textEdit->textColor(), this);
if (!col.isValid())
return;
QTextCharFormat fmt;
fmt.setForeground(col);
mergeFormatOnWordOrSelection(fmt);
colorChanged(col);
}
void TextEdit::textAlign(QAction *a)
{
if (a == actionAlignLeft)
textEdit->setAlignment(Qt::AlignLeft);
else if (a == actionAlignCenter)
textEdit->setAlignment(Qt::AlignHCenter);
else if (a == actionAlignRight)
textEdit->setAlignment(Qt::AlignRight);
else if (a == actionAlignJustify)
textEdit->setAlignment(Qt::AlignJustify);
}
void TextEdit::currentCharFormatChanged(const QTextCharFormat &format)
{
fontChanged(format.font());
colorChanged(format.foreground().color());
}
void TextEdit::cursorPositionChanged()
{
alignmentChanged(textEdit->alignment());
}
void TextEdit::clipboardDataChanged()
{
actionPaste->setEnabled(!QApplication::clipboard()->text().isEmpty());
}
void TextEdit::about()
{
QMessageBox::about(this, tr("About"), tr("This example demonstrates Qt's "
"rich text editing facilities in action, providing an example "
"document for you to experiment with."));
}
void TextEdit::mergeFormatOnWordOrSelection(const QTextCharFormat &format) {
QTextCursor cursor = textEdit->textCursor();
if (!cursor.hasSelection())
cursor.select(QTextCursor::WordUnderCursor);
cursor.mergeCharFormat(format);
textEdit->mergeCurrentCharFormat(format);
}
void TextEdit::fontChanged(const QFont &f)
{
comboFont->setCurrentIndex(comboFont->findText(QFontInfo(f).family())); comboSize->setCurrentIndex(comboSize->findText(QString::number(f.pointSize())));
actionTextBold->setChecked(f.bold());
actionTextItalic->setChecked(f.italic());
actionTextUnderline->setChecked(f.underline());
}
void TextEdit::colorChanged(const QColor &c)
{
QPixmap pix(16, 16);
pix.fill(c);
actionTextColor->setIcon(pix);
}
void TextEdit::alignmentChanged(Qt::Alignment a)
{
if (a & Qt::AlignLeft) {
actionAlignLeft->setChecked(true);
} else if (a & Qt::AlignHCenter) {
actionAlignCenter->setChecked(true);
} else if (a & Qt::AlignRight) {
actionAlignRight->setChecked(true);
} else if (a & Qt::AlignJustify) {
actionAlignJustify->setChecked(true);
}
}。