Qt Quick Controls - Text Editor

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#include "documenthandler.h" #include <QFile> #include <QFileInfo> #include <QFileSelector> #include <QQmlFile> #include <QQmlFileSelector> #include <QQuickTextDocument> #include <QTextCharFormat> #include <QTextCodec> #include <QTextDocument> #include <QDebug> DocumentHandler::DocumentHandler(QObject *parent) : QObject(parent) , m_document(nullptr) , m_cursorPosition(-1) , m_selectionStart(0) , m_selectionEnd(0) { } QQuickTextDocument *DocumentHandler::document() const { return m_document; } void DocumentHandler::setDocument(QQuickTextDocument *document) { if (document == m_document) return; m_document = document; emit documentChanged(); } int DocumentHandler::cursorPosition() const { return m_cursorPosition; } void DocumentHandler::setCursorPosition(int position) { if (position == m_cursorPosition) return; m_cursorPosition = position; reset(); emit cursorPositionChanged(); } int DocumentHandler::selectionStart() const { return m_selectionStart; } void DocumentHandler::setSelectionStart(int position) { if (position == m_selectionStart) return; m_selectionStart = position; emit selectionStartChanged(); } int DocumentHandler::selectionEnd() const { return m_selectionEnd; } void DocumentHandler::setSelectionEnd(int position) { if (position == m_selectionEnd) return; m_selectionEnd = position; emit selectionEndChanged(); } QString DocumentHandler::fontFamily() const { QTextCursor cursor = textCursor(); if (cursor.isNull()) return QString(); QTextCharFormat format = cursor.charFormat(); return format.font().family(); } void DocumentHandler::setFontFamily(const QString &family) { QTextCharFormat format; format.setFontFamily(family); mergeFormatOnWordOrSelection(format); emit fontFamilyChanged(); } QColor DocumentHandler::textColor() const { QTextCursor cursor = textCursor(); if (cursor.isNull()) return QColor(Qt::black); QTextCharFormat format = cursor.charFormat(); return format.foreground().color(); } void DocumentHandler::setTextColor(const QColor &color) { QTextCharFormat format; format.setForeground(QBrush(color)); mergeFormatOnWordOrSelection(format); emit textColorChanged(); } Qt::Alignment DocumentHandler::alignment() const { QTextCursor cursor = textCursor(); if (cursor.isNull()) return Qt::AlignLeft; return textCursor().blockFormat().alignment(); } void DocumentHandler::setAlignment(Qt::Alignment alignment) { QTextBlockFormat format; format.setAlignment(alignment); QTextCursor cursor = textCursor(); cursor.mergeBlockFormat(format); emit alignmentChanged(); } bool DocumentHandler::bold() const { QTextCursor cursor = textCursor(); if (cursor.isNull()) return false; return textCursor().charFormat().fontWeight() == QFont::Bold; } void DocumentHandler::setBold(bool bold) { QTextCharFormat format; format.setFontWeight(bold ? QFont::Bold : QFont::Normal); mergeFormatOnWordOrSelection(format); emit boldChanged(); } bool DocumentHandler::italic() const { QTextCursor cursor = textCursor(); if (cursor.isNull()) return false; return textCursor().charFormat().fontItalic(); } void DocumentHandler::setItalic(bool italic) { QTextCharFormat format; format.setFontItalic(italic); mergeFormatOnWordOrSelection(format); emit italicChanged(); } bool DocumentHandler::underline() const { QTextCursor cursor = textCursor(); if (cursor.isNull()) return false; return textCursor().charFormat().fontUnderline(); } void DocumentHandler::setUnderline(bool underline) { QTextCharFormat format; format.setFontUnderline(underline); mergeFormatOnWordOrSelection(format); emit underlineChanged(); } int DocumentHandler::fontSize() const { QTextCursor cursor = textCursor(); if (cursor.isNull()) return 0; QTextCharFormat format = cursor.charFormat(); return format.font().pointSize(); } void DocumentHandler::setFontSize(int size) { if (size <= 0) return; QTextCursor cursor = textCursor(); if (cursor.isNull()) return; if (!cursor.hasSelection()) cursor.select(QTextCursor::WordUnderCursor); if (cursor.charFormat().property(QTextFormat::FontPointSize).toInt() == size) return; QTextCharFormat format; format.setFontPointSize(size); mergeFormatOnWordOrSelection(format); emit fontSizeChanged(); } QString DocumentHandler::fileName() const { const QString filePath = QQmlFile::urlToLocalFileOrQrc(m_fileUrl); const QString fileName = QFileInfo(filePath).fileName(); if (fileName.isEmpty()) return QStringLiteral("untitled.txt"); return fileName; } QString DocumentHandler::fileType() const { return QFileInfo(fileName()).suffix(); } QUrl DocumentHandler::fileUrl() const { return m_fileUrl; } void DocumentHandler::load(const QUrl &fileUrl) { if (fileUrl == m_fileUrl) return; QQmlEngine *engine = qmlEngine(this); if (!engine) { qWarning() << "load() called before DocumentHandler has QQmlEngine"; return; } const QUrl path = QQmlFileSelector::get(engine)->selector()->select(fileUrl); const QString fileName = QQmlFile::urlToLocalFileOrQrc(path); if (QFile::exists(fileName)) { QFile file(fileName); if (file.open(QFile::ReadOnly)) { QByteArray data = file.readAll(); QTextCodec *codec = QTextCodec::codecForHtml(data); if (QTextDocument *doc = textDocument()) doc->setModified(false); emit loaded(codec->toUnicode(data)); reset(); } } m_fileUrl = fileUrl; emit fileUrlChanged(); } void DocumentHandler::saveAs(const QUrl &fileUrl) { QTextDocument *doc = textDocument(); if (!doc) return; const QString filePath = fileUrl.toLocalFile(); const bool isHtml = QFileInfo(filePath).suffix().contains(QLatin1String("htm")); QFile file(filePath); if (!file.open(QFile::WriteOnly | QFile::Truncate | (isHtml ? QFile::NotOpen : QFile::Text))) { emit error(tr("Cannot save: ") + file.errorString()); return; } file.write((isHtml ? doc->toHtml() : doc->toPlainText()).toUtf8()); file.close(); if (fileUrl == m_fileUrl) return; m_fileUrl = fileUrl; emit fileUrlChanged(); } void DocumentHandler::reset() { emit fontFamilyChanged(); emit alignmentChanged(); emit boldChanged(); emit italicChanged(); emit underlineChanged(); emit fontSizeChanged(); emit textColorChanged(); } QTextCursor DocumentHandler::textCursor() const { QTextDocument *doc = textDocument(); if (!doc) return QTextCursor(); QTextCursor cursor = QTextCursor(doc); if (m_selectionStart != m_selectionEnd) { cursor.setPosition(m_selectionStart); cursor.setPosition(m_selectionEnd, QTextCursor::KeepAnchor); } else { cursor.setPosition(m_cursorPosition); } return cursor; } QTextDocument *DocumentHandler::textDocument() const { if (!m_document) return nullptr; return m_document->textDocument(); } void DocumentHandler::mergeFormatOnWordOrSelection(const QTextCharFormat &format) { QTextCursor cursor = textCursor(); if (!cursor.hasSelection()) cursor.select(QTextCursor::WordUnderCursor); cursor.mergeCharFormat(format); }