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详细说明： #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #incl ude #include #include #ifndef QT_NO_PRINTER #include #include #include #endif #include "textedit.h" #ifdef Q_OS_MAC const QString rsrcPath = ":/images/mac"; #else const QString rsrcPath = ":/images/win"; #endif TextEdit::TextEdit(QWidget *parent) : QMainWindow(parent) { #ifdef Q_OS_OSX setUnifiedTitleAndToolBarOnMac(true); #endif setToolButtonStyle(Qt::ToolButtonFollowStyle); setupFileActions(); setupEditActions(); setupTextActions(); { QMenu *helpMenu = new QMenu(tr("Help"), this); menuBar()->addMenu(helpMenu); helpMenu->addAction(tr("About"), this, SLOT(about())); helpMenu->addAction(tr("About &Qt"), qApp, SLOT(aboutQt())); } textEdit = new QTextEdit(this); connect(textEdit, SIGNAL(currentCharFormatChanged(QTextCharFormat)), this, SLOT(currentCharFormatChanged(QTextCharFormat))); connect(textEdit, SIGNAL(cursorPositionChanged()), this, SLOT(cursorPositionChanged())); setCentralWidget(textEdit); textEdit->setFocus(); setCurrentFileName(QString()); QFont textFont("Helvetica"); textFont.setStyleHint(QFont::SansSerif); textEdit->setFont(textFont); 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))); #ifndef QT_NO_CLIPBOARD connect(QApplication::clipboard(), SIGNAL(dataChanged()), this, SLOT(clipboardDataChanged())); #endif QString initialFile = ":/example.html"; 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(tr("&File"), this); menuBar()->addMenu(menu); QAction *a; QIcon newIcon = QIcon::fromTheme("document-new", QIcon(rsrcPath + "/filenew.png")); a = new QAction( newIcon, tr("&New"), this); a->setPriority(QAction::LowPriority); a->setShortcut(QKeySequence::New); connect(a, SIGNAL(triggered()), this, SLOT(fileNew())); tb->addAction(a); menu->addAction(a); a = new QAction(QIcon::fromTheme("document-open", QIcon(rsrcPath + "/fileopen.png")), tr("&Open..."), 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::fromTheme("document-save", QIcon(rsrcPath + "/filesave.png")), tr("&Save"), this); a->setShortcut(QKeySequence::Save); connect(a, SIGNAL(triggered()), this, SLOT(fileSave())); a->setEnabled(false); tb->addAction(a); menu->addAction(a); a = new QAction(tr("Save &As..."), this); a->setPriority(QAction::LowPriority); connect(a, SIGNAL(triggered()), this, SLOT(fileSaveAs())); menu->addAction(a); menu->addSeparator(); #ifndef QT_NO_PRINTER a = new QAction(QIcon::fromTheme("document-print", QIcon(rsrcPath + "/fileprint.png")), tr("&Print..."), this); a->setPriority(QAction::LowPriority); a->setShortcut(QKeySequence::Print); connect(a, SIGNAL(triggered()), this, SLOT(filePrint())); tb->addAction(a); menu->addAction(a); a = new QAction(QIcon::fromTheme("fileprint", QIcon(rsrcPath + "/fileprint.png")), tr("Print Preview..."), this); connect(a, SIGNAL(triggered()), this, SLOT(filePrintPreview())); menu->addAction(a); a = new QAction(QIcon::fromTheme("exportpdf", QIcon(rsrcPath + "/exportpdf.png")), tr("&Export PDF..."), this); a->setPriority(QAction::LowPriority); a->setShortcut(Qt::CTRL + Qt::Key_D); connect(a, SIGNAL(triggered()), this, SLOT(filePrintPdf())); tb->addAction(a); menu->addAction(a); menu->addSeparator(); #endif a = new QAction(tr("&Quit"), 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(tr("&Edit"), this); menuBar()->addMenu(menu); QAction *a; a = actionUndo = new QAction(QIcon::fromTheme("edit-undo", QIcon(rsrcPath + "/editundo.png")), tr("&Undo"), this); a->setShortcut(QKeySequence::Undo); tb->addAction(a); menu->addAction(a); a = actionRedo = new QAction(QIcon::fromTheme("edit-redo", QIcon(rsrcPath + "/editredo.png")), tr("&Redo"), this); a->setPriority(QAction::LowPriority); a->setShortcut(QKeySequence::Redo); tb->addAction(a); menu->addAction(a); menu->addSeparator(); a = actionCut = new QAction(QIcon::fromTheme("edit-cut", QIcon(rsrcPath + "/editcut.png")), tr("Cu&t"), this); a->setPriority(QAction::LowPriority); a->setShortcut(QKeySequence::Cut); tb->addAction(a); menu->addAction(a); a = actionCopy = new QAction(QIcon::fromTheme("edit-copy", QIcon(rsrcPath + "/editcopy.png")), tr("&Copy"), this); a->setPriority(QAction::LowPriority); a->setShortcut(QKeySequence::Copy); tb->addAction(a); menu->addAction(a); a = actionPaste = new QAction(QIcon::fromTheme("edit-paste", QIcon(rsrcPath + "/editpaste.png")), tr("&Paste"), this); a->setPriority(QAction::LowPriority); a->setShortcut(QKeySequence::Paste); tb->addAction(a); menu->addAction(a); #ifndef QT_NO_CLIPBOARD if (const QMimeData *md = QApplication::clipboard()->mimeData()) actionPaste->setEnabled(md->hasText()); #endif } void TextEdit::setupTextActions() { QToolBar *tb = new QToolBar(this); tb->setWindowTitle(tr("Format Actions")); addToolBar(tb); QMenu *menu = new QMenu(tr("F&ormat"), this); menuBar()->addMenu(menu); actionTextBold = new QAction(QIcon::fromTheme("format-text-bold", QIcon(rsrcPath + "/textbold.png")), tr("&Bold"), this); actionTextBold->setShortcut(Qt::CTRL + Qt::Key_B); actionTextBold->setPriority(QAction::LowPriority); 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::fromTheme("format-text-italic", QIcon(rsrcPath + "/textitalic.png")), tr("&Italic"), this); actionTextItalic->setPriority(QAction::LowPriority); 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::fromTheme("format-text-underline", QIcon(rsrcPath + "/textunder.png")), tr("&Underline"), this); actionTextUnderline->setShortcut(Qt::CTRL + Qt::Key_U); actionTextUnderline->setPriority(QAction::LowPriority); 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*))); // Make sure the alignLeft is always left of the alignRight if (QApplication::isLeftToRight()) { actionAlignLeft = new QAction(QIcon::fromTheme("format-justify-left", QIcon(rsrcPath + "/textleft.png")), tr("&Left"), grp); actionAlignCenter = new QAction(QIcon::fromTheme("format-justify-center", QIcon(rsrcPath + "/textcenter.png")), tr("C&enter"), grp); actionAlignRight = new QAction(QIcon::fromTheme("format-justify-right", QIcon(rsrcPath + "/textright.png")), tr("&Right"), grp); } else { actionAlignRight = new QAction(QIcon::fromTheme("format-justify-right", QIcon(rsrcPath + "/textright.png")), tr("&Right"), grp); actionAlignCenter = new QAction(QIcon::fromTheme("format-justify-center", QIcon(rsrcPath + "/textcenter.png")), tr("C&enter"), grp); actionAlignLeft = new QAction(QIcon::fromTheme("format-justify-left", QIcon(rsrcPath + "/textleft.png")), tr("&Left"), grp); } actionAlignJustify = new QAction(QIcon::fromTheme("format-justify-fill", QIcon(rsrcPath + "/textjustify.png")), tr("&Justify"), grp); actionAlignLeft->setShortcut(Qt::CTRL + Qt::Key_L); actionAlignLeft->setCheckable(true); actionAlignLeft->setPriority(QAction::LowPriority); actionAlignCenter->setShortcut(Qt::CTRL + Qt::Key_E); actionAlignCenter->setCheckable(true); actionAlignCenter->setPriority(QAction::LowPriority); actionAlignRight->setShortcut(Qt::CTRL + Qt::Key_R); actionAlignRight->setCheckable(true); actionAlignRight->setPriority(QAction::LowPriority); actionAlignJustify->setShortcut(Qt::CTRL + Qt::Key_J); actionAlignJustify->setCheckable(true); actionAlignJustify->setPriority(QAction::LowPriority); tb->addActions(grp->actions()); menu->addActions(grp->actions()); menu->addSeparator(); QPixmap pix(16, 16); pix.fill(Qt::black); actionTextColor = new QAction(pix, tr("&Color..."), 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)"); comboStyle->addItem("Ordered List (Roman lower)"); comboStyle->addItem("Ordered List (Roman upper)"); connect(comboStyle, SIGNAL(activated(int)), this, SLOT(textStyle(int))); comboFont = new QFontComboBox(tb); tb->addWidget(comboFont); connect(comboFont, SIGNAL(activated(QString)), this, SLOT(textFamily(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(QString)), this, SLOT(textSize(QString))); comboSize->setCurrentIndex(comboSize->findText(QString::number(QApplication::font() .pointSize()))); } 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; QMessageBox::StandardButton ret; ret = QMessageBox::warning(this, tr("Application"), tr("The document has been modified.\n" "Do you want to save your changes?"), QMessageBox::Save | QMessageBox::Discard | QMessageBox::Cancel); if (ret == QMessageBox::Save) 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 = "untitled.txt"; else shownName = QFileInfo(fileName).fileName(); setWindowTitle(tr("%1[*] - %2").arg(shownName).arg(tr("Rich Text"))); setWindowModified(false); } void TextEdit::fileNew() { if (maybeSave()) { textEdit->clear(); setCurrentFileName(QString()); } } void TextEdit::fileOpen() { QString fn = QFileDialog::getOpenFileName(this, tr("Open File..."), QString(), tr("HTML-Files (*.htm *.html);;All Files (*)")); if (!fn.isEmpty()) load(fn); } bool TextEdit::fileSave() { if (fileName.isEmpty()) return fileSaveAs(); if (fileName.startsWith(QStringLiteral(":/"))) return fileSaveAs(); QTextDocumentWriter writer(fileName); bool success = writer.write(textEdit->document()); if (success) textEdit->document()->setModified(false); return success; } bool TextEdit::fileSaveAs() { QString fn = QFileDialog::getSaveFileName(this, tr("Save as..."), QString(), tr("ODF files (*.odt);;HTML-Files " "(*.htm *.html);;All Files (*)")); if (fn.isEmpty()) return false; if (!(fn.endsWith(".odt", Qt::CaseInsensitive) || fn.endsWith(".htm", Qt::CaseInsensitive) || fn.endsWith(".html", Qt::CaseInsensitive))) { fn += ".odt"; // default } setCurrentFileName(fn); return fileSave(); } void TextEdit::filePrint() { #if !defined(QT_NO_PRINTER) && !defined(QT_NO_PRINTDIALOG) 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() { #if !defined(QT_NO_PRINTER) && !defined(QT_NO_PRINTDIALOG) 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 QString fileName = QFileDialog::getSaveFileName(this, "Export 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); } #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) { qreal pointSize = p.toFloat(); if (p.toFloat() > 0) { QTextCharFormat fmt; fmt.setFontPointSize(pointSize); 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; case 7: style = QTextListFormat::ListLowerRoman; break; case 8: style = QTextListFormat::ListUpperRoman; 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 | Qt::AlignAbsolute); else if (a == actionAlignCenter) textEdit->setAlignment(Qt::AlignHCenter); else if (a == actionAlignRight) textEdit->setAlignment(Qt::AlignRight | Qt::AlignAbsolute); 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() { #ifndef QT_NO_CLIPBOARD if (const QMimeData *md = QApplication::clipboard()->mimeData()) actionPaste->setEnabled(md->hasText()); #endif } 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); } ...展开收缩
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