QT实现的文本编辑器（完整代码）

#include "DemandEdit.h" #include "ui_DemandEdit.h" #include <QFile> #include <QFileDialog> #include <QFileInfo> #include <QMessageBox> #include <QTextDocumentWriter> #include <QColorDialog> #include <QFontComboBox> #include <QTextCodec> #include <QTextCursor> #include <QTextList> #include <QClipboard>//剪切板 #include <QApplication> #include <QMimeData> #include <QImageReader> #include <QTextTableCellFormat> #include <QInputDialog> #include <QMenu> #pragma execution_character_set("utf-8") DemandEdit::DemandEdit(QWidget *parent /*= 0*/) : QWidget(parent), ui(new Ui::DemandEdit) { ui->setupUi(this); //初始化 Init(); //当前字符更改信号 connect(ui->textEdit, SIGNAL(currentCharFormatChanged(const QTextCharFormat &)), this, SLOT(currentCharFormatChanged(const QTextCharFormat &))); //光标位置更改信号 connect(ui->textEdit, SIGNAL(cursorPositionChanged()), this, SLOT(cursorPositionChanged())); connect(ui->textEdit->document(), SIGNAL(modificationChanged(bool)), ui->btn_save, SLOT(setEnabled(bool))); connect(ui->textEdit->document(), &QTextDocument::modificationChanged, this, &QWidget::setWindowModified); connect(ui->textEdit->document(), SIGNAL(undoAvailable(bool)), ui->btn_undo, SLOT(setEnabled(bool))); connect(ui->textEdit->document(),SIGNAL(redoAvailable(bool)), ui->btn_redo, SLOT(setEnabled(bool))); setWindowModified(ui->textEdit->document()->isModified()); ui->btn_save->setEnabled(ui->textEdit->document()->isModified()); ui->btn_undo->setEnabled(ui->textEdit->document()->isUndoAvailable()); ui->btn_redo->setEnabled(ui->textEdit->document()->isRedoAvailable()); connect(QApplication::clipboard(), &QClipboard::dataChanged, this, &DemandEdit::clipboardDataChanged); //右键菜单 ui->textEdit->setContextMenuPolicy(Qt::CustomContextMenu); connect(ui->textEdit, SIGNAL(customContextMenuRequested(const QPoint &)), this, SLOT(on_ContextMenuRequested(const QPoint &))); } DemandEdit::~DemandEdit() { delete ui; } //初始化 void DemandEdit::Init() { //初始化标签下拉框 ui->cb_sign->addItem("Standard"); ui->cb_sign->addItem("Bullet List (Disc)"); ui->cb_sign->addItem("Bullet List (Circle)"); ui->cb_sign->addItem("Bullet List (Square)"); ui->cb_sign->addItem("Ordered List (Decimal)"); ui->cb_sign->addItem("Ordered List (Alpha lower)"); ui->cb_sign->addItem("Ordered List (Alpha upper)"); ui->cb_sign->addItem("Ordered List (Roman lower)"); ui->cb_sign->addItem("Ordered List (Roman upper)"); //初始化字号下拉框 const QList<int> standardSizes = QFontDatabase::standardSizes(); foreach(int size, standardSizes) ui->cb_size->addItem(QString::number(size)); ui->cb_size->setCurrentIndex(standardSizes.indexOf(QApplication::font().pointSize())); //加粗 QFont bold; bold.setBold(true); ui->btn_bold->setFont(bold); ui->btn_bold->setCheckable(true); //倾斜 QFont italic; italic.setItalic(true); ui->btn_italic->setFont(italic); ui->btn_italic->setCheckable(true); //下划线 QFont underline; underline.setUnderline(true); ui->btn_underline->setFont(underline); ui->btn_underline->setCheckable(true); ui->btn_left->setShortcut(Qt::CTRL + Qt::Key_L); ui->btn_left->setCheckable(true); ui->btn_center->setShortcut(Qt::CTRL + Qt::Key_E); ui->btn_center->setCheckable(true); ui->btn_right->setShortcut(Qt::CTRL + Qt::Key_R); ui->btn_right->setCheckable(true); ui->btn_justify->setShortcut(Qt::CTRL + Qt::Key_J); ui->btn_justify->setCheckable(true); QFont textFont("Helvetica"); textFont.setStyleHint(QFont::SansSerif); ui->textEdit->setFont(textFont); fontChanged(ui->textEdit->font()); colorChanged(ui->textEdit->textColor()); alignmentChanged(ui->textEdit->alignment()); //行间距 默认设为10 ui->lineHeightspinBox->setValue(10); on_lineHeightspinBox_valueChanged(QString("10")); } void DemandEdit::setCurrentFileName(const QString &fileName) { m_fileName = fileName; ui->textEdit->document()->setModified(false); QString shownName; if (fileName.isEmpty()) shownName = "untitled.txt"; else shownName = QFileInfo(fileName).fileName(); setWindowModified(false); } bool DemandEdit::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)) { ui->textEdit->setHtml(str); } else { str = QString::fromLocal8Bit(data); ui->textEdit->setPlainText(str); } setCurrentFileName(f); return true; } bool DemandEdit::fileSave() { if (m_fileName.isEmpty()) return fileSaveAs(); if (m_fileName.startsWith(QStringLiteral(":/"))) return fileSaveAs(); QTextDocumentWriter writer(m_fileName); bool success = writer.write(ui->textEdit->document()); if (success) { ui->textEdit->document()->setModified(false); QMessageBox::information(this, QString("提示"), QString("Wrote %1").arg(QDir::toNativeSeparators(m_fileName))); } else { QMessageBox::information(this, QString("提示"), QString("Could not write to file %1").arg(QDir::toNativeSeparators(m_fileName))); } return success; } bool DemandEdit::fileSaveAs() { QFileDialog fileDialog(this, tr("Save as...")); fileDialog.setAcceptMode(QFileDialog::AcceptSave); QStringList mimeTypes; mimeTypes << "application/vnd.oasis.opendocument.text" << "text/html" << "text/plain"; fileDialog.setMimeTypeFilters(mimeTypes); fileDialog.setDefaultSuffix("odt"); if (fileDialog.exec() != QDialog::Accepted) return false; const QString fn = fileDialog.selectedFiles().first(); setCurrentFileName(fn); return fileSave(); } void DemandEdit::mergeFormatOnWordOrSelection(const QTextCharFormat &format) { QTextCursor cursor = ui->textEdit->textCursor(); if (!cursor.hasSelection()) cursor.select(QTextCursor::WordUnderCursor); cursor.mergeCharFormat(format); ui->textEdit->mergeCurrentCharFormat(format); } //************************************ // 方法名称: fontChanged // 概要: 字体变化 // 方法全称: DemandEdit::fontChanged // 访问权限: private // 返回值: void // 参数: const QFont & f //************************************ void DemandEdit::fontChanged(const QFont & f) { ui->cb_font->setCurrentIndex(ui->cb_font->findText(QFontInfo(f).family())); ui->cb_size->setCurrentIndex(ui->cb_size->findText(QString::number(f.pointSize()))); ui->btn_bold->setChecked(f.bold()); ui->btn_italic->setChecked(f.italic()); ui->btn_underline->setChecked(f.underline()); } //************************************ // 方法名称: colorChanged // 概要: 颜色变化 // 方法全称: DemandEdit::colorChanged // 访问权限: private // 返回值: void // 参数: const QColor & c //************************************ void DemandEdit::colorChanged(const QColor & c) { QPixmap pix(20, 20); pix.fill(c); ui->btn_color->setIcon(pix); } //************************************ // 方法名称: alignmentChanged // 概要: 对齐方式变化 // 方法全称: DemandEdit::alignmentChanged // 访问权限: private // 返回值: void // 参数: Qt::Alignment a //************************************ void DemandEdit::alignmentChanged(Qt::Alignment a) { if (a & Qt::AlignLeft) { ui->btn_left->setChecked(true); ui->btn_center->setChecked(false); ui->btn_right->setChecked(false); ui->btn_justify->setChecked(false); } else if (a & Qt::AlignHCenter) { ui->btn_center->setChecked(true); ui->btn_left->setChecked(false); ui->btn_right->setChecked(false); ui->btn_justify->setChecked(false); } else if (a & Qt::AlignRight) { ui->btn_right->setChecked(true); ui->btn_left->setChecked(fa