basetexteditor.cpp

        if (ch == QLatin1Char(' '))
            indentLevel++;
        else if (ch == QLatin1Char('\t'))
            indentLevel += tabSize - (indentLevel % tabSize);
        else
            break;
    }

    // If there is a common prefix, it should be kept and expanded to all lines.
    // this allows nice reflowing of doxygen style comments.
    QTextCursor nextBlock = cursor;
    QString commonPrefix;

    if (nextBlock.movePosition(QTextCursor::NextBlock))
    {
         QString nText = nextBlock.block().text();
         int maxLength = qMin(text.length(), nText.length());

         for (int i = 0; i < maxLength; ++i) {
             const QChar ch = text.at(i);

             if (ch != nText[i] || ch.isLetterOrNumber())
                 break;
             commonPrefix.append(ch);
         }
    }


    // Find end of paragraph.
    while (cursor.movePosition(QTextCursor::NextBlock, QTextCursor::KeepAnchor)) {
        QString text = cursor.block().text();

        if (!text.contains(anyLettersOrNumbers))
            break;
    }


    QString selectedText = cursor.selectedText();

    // Preserve initial indent level.or common prefix.
    QString spacing;

    if (commonPrefix.isEmpty()) {
        spacing = tabSettings().indentationString(0, indentLevel, textCursor().block());
    } else {
        spacing = commonPrefix;
        indentLevel = commonPrefix.length();
    }

    int currentLength = indentLevel;
    QString result;
    result.append(spacing);

    // Remove existing instances of any common prefix from paragraph to
    // reflow.
    selectedText.remove(0, commonPrefix.length());
    commonPrefix.prepend(QChar::ParagraphSeparator);
    selectedText.replace(commonPrefix, QLatin1String("\n"));

    // remove any repeated spaces, trim lines to PARAGRAPH_WIDTH width and
    // keep the same indentation level as first line in paragraph.
    QString currentWord;

    for (int i = 0; i < selectedText.length(); ++i) {
        QChar ch = selectedText.at(i);
        if (ch.isSpace()) {
            if (!currentWord.isEmpty()) {
                currentLength += currentWord.length() + 1;

                if (currentLength > paragraphWidth) {
                    currentLength = currentWord.length() + 1 + indentLevel;
                    result.chop(1); // remove trailing space
                    result.append(QChar::ParagraphSeparator);
                    result.append(spacing);
                }

                result.append(currentWord);
                result.append(QLatin1Char(' '));
                currentWord.clear();
            }

            continue;
        }

        currentWord.append(ch);
    }
    result.chop(1);
    result.append(QChar::ParagraphSeparator);

    cursor.insertText(result);
    cursor.endEditBlock();
}

void BaseTextEditor::unCommentSelection()
{
}

void BaseTextEditor::showEvent(QShowEvent* e)
{
    if (!d->m_fontSettings.isEmpty()) {
        setFontSettings(d->m_fontSettings);
        d->m_fontSettings.clear();
    }
    QPlainTextEdit::showEvent(e);
}


void BaseTextEditor::setFontSettingsIfVisible(const TextEditor::FontSettings &fs)
{
    if (!isVisible()) {
        d->m_fontSettings = fs;
        return;
    }
    setFontSettings(fs);
}

void BaseTextEditor::setFontSettings(const TextEditor::FontSettings &fs)
{
    const QTextCharFormat textFormat = fs.toTextCharFormat(QLatin1String(Constants::C_TEXT));
    const QTextCharFormat selectionFormat = fs.toTextCharFormat(QLatin1String(Constants::C_SELECTION));
    const QTextCharFormat lineNumberFormat = fs.toTextCharFormat(QLatin1String(Constants::C_LINE_NUMBER));
    const QTextCharFormat searchResultFormat = fs.toTextCharFormat(QLatin1String(Constants::C_SEARCH_RESULT));
    d->m_searchScopeFormat = fs.toTextCharFormat(QLatin1String(Constants::C_SEARCH_SCOPE));
    const QTextCharFormat parenthesesFormat = fs.toTextCharFormat(QLatin1String(Constants::C_PARENTHESES));
    d->m_currentLineFormat = fs.toTextCharFormat(QLatin1String(Constants::C_CURRENT_LINE));
    d->m_currentLineNumberFormat = fs.toTextCharFormat(QLatin1String(Constants::C_CURRENT_LINE_NUMBER));
    d->m_linkFormat = fs.toTextCharFormat(QLatin1String(TextEditor::Constants::C_LINK));
    d->m_ifdefedOutFormat = fs.toTextCharFormat(QLatin1String(Constants::C_DISABLED_CODE));
    QFont font(textFormat.font());

    const QColor foreground = textFormat.foreground().color();
    const QColor background = textFormat.background().color();
    QPalette p = palette();
    p.setColor(QPalette::Text, foreground);
    p.setColor(QPalette::Foreground, foreground);
    p.setColor(QPalette::Base, background);
    p.setColor(QPalette::Highlight, (selectionFormat.background().style() != Qt::NoBrush) ?
               selectionFormat.background().color() :
               QApplication::palette().color(QPalette::Highlight));
    p.setColor(QPalette::HighlightedText, selectionFormat.foreground().color());
    p.setBrush(QPalette::Inactive, QPalette::Highlight, p.highlight());
    p.setBrush(QPalette::Inactive, QPalette::HighlightedText, p.highlightedText());
    setPalette(p);
    setFont(font);
    setTabSettings(d->m_document->tabSettings()); // update tabs, they depend on the font

    // Line numbers
    QPalette ep = d->m_extraArea->palette();
    ep.setColor(QPalette::Dark, lineNumberFormat.foreground().color());
    ep.setColor(QPalette::Background, lineNumberFormat.background().style() != Qt::NoBrush ?
                lineNumberFormat.background().color() : background);
    d->m_extraArea->setPalette(ep);

    // Search results
    d->m_searchResultFormat.setBackground(searchResultFormat.background());

    // Matching braces
    d->m_matchFormat.setForeground(parenthesesFormat.foreground());
    d->m_rangeFormat.setBackground(parenthesesFormat.background());

    slotUpdateExtraAreaWidth();   // Adjust to new font width
    updateCurrentLineHighlight(); // Make sure it takes the new color
}

void BaseTextEditor::setTabSettings(const TabSettings &ts)
{
    d->m_document->setTabSettings(ts);
    int charWidth = QFontMetrics(font()).width(QChar(' '));
    setTabStopWidth(charWidth * ts.m_tabSize);
}

void BaseTextEditor::setDisplaySettings(const DisplaySettings &ds)
{
    setLineWrapMode(ds.m_textWrapping ? QPlainTextEdit::WidgetWidth : QPlainTextEdit::NoWrap);
    setLineNumbersVisible(ds.m_displayLineNumbers);
    setVisibleWrapColumn(ds.m_showWrapColumn ? ds.m_wrapColumn : 0);
    setCodeFoldingVisible(ds.m_displayFoldingMarkers);
    setHighlightCurrentLine(ds.m_highlightCurrentLine);
    setRevisionsVisible(ds.m_markTextChanges);

    if (d->m_displaySettings.m_visualizeWhitespace != ds.m_visualizeWhitespace) {
        if (QSyntaxHighlighter *highlighter = baseTextDocument()->syntaxHighlighter())
            highlighter->rehighlight();
        QTextOption option =  document()->defaultTextOption();
        if (ds.m_visualizeWhitespace)
            option.setFlags(option.flags() | QTextOption::ShowTabsAndSpaces);
        else
            option.setFlags(option.flags() & ~QTextOption::ShowTabsAndSpaces);
        option.setFlags(option.flags() | QTextOption::AddSpaceForLineAndParagraphSeparators);
        document()->setDefaultTextOption(option);
    }

    d->m_displaySettings = ds;
    if (!ds.m_highlightBlocks) {
        d->extraAreaHighlightCollapseBlockNumber = d->extraAreaHighlightCollapseColumn = -1;
        d->m_highlightBlocksInfo = BaseTextEditorPrivateHighlightBlocks();
    }

    updateHighlights();
    viewport()->update();
    extraArea()->update();
}

void BaseTextEditor::setBehaviorSettings(const TextEditor::BehaviorSettings &bs)
{
    setMouseNavigationEnabled(bs.m_mouseNavigation);
    setScrollWheelZoomingEnabled(bs.m_scrollWheelZooming);
}

void BaseTextEditor::setStorageSettings(const StorageSettings &storageSettings)
{
    d->m_document->setStorageSettings(storageSettings);
}

void BaseTextEditor::collapse()
{
    QTextDocument *doc = document();
    TextEditDocumentLayout *documentLayout = qobject_cast<TextEditDocumentLayout*>(doc->documentLayout());
    QTC_ASSERT(documentLayout, return);
    QTextBlock block = textCursor().block();
    QTextBlock curBlock = block;
    while (block.isValid()) {
        if (TextBlockUserData::canCollapse(block) && block.next().isVisible()) {
            if (block == curBlock || block.next() == curBlock)
                break;
            if ((block.next().userState()) >> 8 <= (curBlock.previous().userState() >> 8))
                break;
        }
        block = block.previous();
    }
    if (block.isValid()) {
        TextBlockUserData::doCollapse(block, false);
        d->moveCursorVisible();
        documentLayout->requestUpdate();
        documentLayout->emitDocumentSizeChanged();
    }
}

void BaseTextEditor::expand()
{
    QTextDocument *doc = document();
    TextEditDocumentLayout *documentLayout = qobject_cast<TextEditDocumentLayout*>(doc->documentLayout());
    QTC_ASSERT(documentLayout, return);
    QTextBlock block = textCursor().block();
    while (block.isValid() && !block.isVisible())
        block = block.previous();
    TextBlockUserData::doCollapse(block, true);
    d->moveCursorVisible();
    documentLayout->requestUpdate();
    documentLayout->emitDocumentSizeChanged();
}

void BaseTextEditor::unCollapseAll()
{
    QTextDocument *doc = document();
    TextEditDocumentLayout *documentLayout = qobject_cast<TextEditDocumentLayout*>(doc->documentLayout());
    QTC_ASSERT(documentLayout, return);

    QTextBlock block = doc->firstBlock();
    bool makeVisible = true;
    while (block.isValid()) {
        if (block.isVisible() && TextBlockUserData::canCollapse(block) && block.next().isVisible()) {
            makeVisible = false;
            break;
        }
        block = block.next();
    }

    block = doc->firstBlock();

    while (block.isValid()) {
        if (TextBlockUserData::canCollapse(block))
            TextBlockUserData::doCollapse(block, makeVisible);
        block = block.next();
    }

    d->moveCursorVisible();
    documentLayout->requestUpdate();
    documentLayout->emitDocumentSizeChanged();
    centerCursor();
}

void BaseTextEditor::setTextCodec(QTextCodec *codec)
{
    baseTextDocument()->setCodec(codec);
}

QTextCodec *BaseTextEditor::textCodec() const
{
    return baseTextDocument()->codec();
}

void BaseTextEditor::setReadOnly(bool b)
{
    QPlainTextEdit::setReadOnly(b);
    if (b)
        setTextInteractionFlags(textInteractionFlags() | Qt::TextSelectableByKeyboard);
}

void BaseTextEditor::cut()
{
    if (d->m_inBlockSelectionMode) {
        copy();
        d->removeBlockSelection();
        return;
    }
    QPlainTextEdit::cut();
}

void BaseTextEditor::paste()
{
    if (d->m_inBlockSelectionMode) {
        d->removeBlockSelection();
    }
    QPlainTextEdit::paste();
}

QMimeData *BaseTextEditor::createMimeDataFromSelection() const
{
    if (d->m_inBlockSelectionMode) {
        QMimeData *mimeData = new QMimeData;
        QString text = d->copyBlockSelection();
        mimeData->setData(QLatin1String("application/vnd.nokia.qtcreator.vblocktext"), text.toUtf8());
        mimeData->setText(text); // for exchangeability
        return mimeData;
    } else if (textCursor().hasSelection()){
        QTextCursor cursor = textCursor();
        QMimeData *mimeData = new QMimeData;
        QString text = cursor.selectedText();
        convertToPlainText(text);
        mimeData->setText(text);

        /*
          Try to figure out whether we are copying an entire block, and store the complete block
          including indentation in the qtcreator.blocktext mimetype.
        */
        QTextCursor selstart = cursor;
        selstart.setPosition(cursor.selectionStart());
        QTextCursor selend = cursor;
        selend.setPosition(cursor.selectionEnd());
        const TabSettings &ts = d->m_document->tabSettings();

        bool startOk = ts.cursorIsAtBeginningOfLine(selstart);
        bool multipleBlocks = (selend.block() != selstart.block());

        if (startOk && multipleBlocks) {
            selstart.movePosition(QTextCursor::StartOfBlock);
            if (ts.cursorIsAtBeginningOfLine(selend))
                selend.movePosition(QTextCursor::StartOfBlock);
            cursor.setPosition(selstart.position());
            cursor.setPosition(selend.position(), QTextCursor::KeepAnchor);
            text = cursor.selectedText();
            mimeData->setData(QLatin1String("application/vnd.nokia.qtcreator.blocktext"), text.toUtf8());
        }
        return mimeData;
    }
    return 0;
}

bool BaseTextEditor::canInsertFromMimeData(const QMimeData *source) const
{
    return QPlainTextEdit::canInsertFromMimeData(source);
}

void BaseTextEditor::insertFromMimeData(const QMimeData *source)
{
    if (isReadOnly())
        return;

    if (source->hasFormat(QLatin1String("application/vnd.nokia.qtcreator.vblocktext"))) {
        QString text = QString::fromUtf8(source->data(QLatin1String("application/vnd.nokia.qtcreator.vblocktext")));
        if (text.isEmpty())
            return;
        QStringList lines = text.split(QLatin1Char('\n'));
        QTextCursor cursor = textCursor();
        cursor.beginEditBlock();
        int initialCursorPosition = cursor.position();
        int column = cursor.position() - cursor.block().position();
        cursor.insertText(lines.first());
        for (int i = 1; i < lines.count(); ++i) {
            QTextBlock next = cursor.block().next();
            if (next.isValid()) {
                cursor.setPosition(next.position() + qMin(column, next.length()-1));
            } else {
                cursor.movePosition(QTextCursor::EndOfBlock);
                cursor.insertBlock();
            }

            int actualColumn = cursor.position() - cursor.block().position();
            if (actualColumn < column)
                cursor.insertText(QString(column - actualColumn, QLatin1Char(' ')));
            cursor.insertText(lines.at(i));
        }
        cursor.setPosition(initialCursorPosition);
        cursor.endEditBlock();
        setTextCursor(cursor);
        ensureCursorVisible();
        return;
    }



    QString text = source->text();
    if (text.isEmpty())
        return;

    const TabSettings &ts = d->m_document->tabSettings();
    QTextCursor cursor = textCursor();
    if (!ts.m_autoIndent) {
        cursor.beginEditBlock();
        cursor.insertText(text);
        cursor.endEditBlock();
        setTextCursor(cursor);
        return;
    }

    cursor.beginEditBlock();
    cursor.removeSelectedText();

    bool insertAtBeginningOfLine = ts.cursorIsAtBeginningOfLine(cursor);

    if (insertAtBeginningOfLine
        && source->hasFormat(QLatin1String("application/vnd.nokia.qtcreator.blocktext"))) {
        text = QString::fromUtf8(source->data(QLatin1String("application/vnd.nokia.qtcreator.blocktext")));
        if (text.isEmpty())
            return;
    }

    int reindentBlockStart = cursor.blockNumber() + (insertAtBeginningOfLine?0:1);

    bool hasFinalNewline = (text.endsWith(QLatin1Char('\n'))
                            || text.endsWith(QChar::ParagraphSeparator)
                            || text.endsWith(QLatin1Char('\r')));

    if (insertAtBeginningOfLine
        && hasFinalNewline) // since we'll add a final newline, preserve current line's indentation
        cursor.setPosition(cursor.block().position());

    int cursorPosition = cursor.position();
    cursor.insertText(text);

    int reindentBlockEnd = cursor.blockNumber() - (hasFinalNewline?1:0);

    if (reindentBlockStart < reindentBlockEnd
        || (reindentBlockStart == reindentBlockEnd
            && (!insertAtBeginningOfLine || hasFinalNewline))) {
        if (insertAtBeginningOfLine && !hasFinalNewline) {
            QTextCursor unnecessaryWhitespace = cursor;
            unnecessaryWhitespace.setPosition(cursorPosition);
            unnecessaryWhitespace.movePosition(QTextCursor::StartOfBlock, QTextCursor::KeepAnchor);
            unnecessaryWhitespace.removeSelectedText();
        }
        QTextCursor c = cursor;
        c.setPosition(cursor.document()->findBlockByNumber(reindentBlockStart).position());
        c.setPosition(cursor.document()->findBlockByNumber(reindentBlockEnd).position(),
                      QTextCursor::KeepAnchor);
        reindent(document(), c);
    }

    cursor.endEditBlock();
    setTextCursor(cursor);
}

BaseTextEditorEditable::BaseTextEditorEditable(BaseTextEditor *editor)
  : e(editor)
{
    using namespace Find;
    Aggregation::Aggregate *aggregate = new Aggregation::Aggregate;
    BaseTextFind *baseTextFind = new BaseTextFind(editor);
    connect(baseTextFind, SIGNAL(highlightAll(QString, Find::IFindSupport::FindFlags)),
            editor, SLOT(highlightSearchResults(QString, Find::IFindSupport::FindFlags)));
    connect(baseTextFind, SIGNAL(findScopeChanged(QTextCursor)), editor, SLOT(setFindScope(QTextCursor)));
    aggregate->add(baseTextFind);
    aggregate->add(editor);

    m_cursorPositionLabel = new Utils::LineColumnLabel;

    QHBoxLayout *l = new QHBoxLayout;
    QWidget *w = new QWidget;
    l->setMargin(0);
    l->setContentsMargins(5, 0, 5, 0);
    l->addStretch(0);
    l->addWidget(m_cursorPositionLabel);
    w->setLayout(l);

    m_toolBar = new QToolBar;
    m_toolBar->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum);
    m_toolBar->addWidget(w);

    connect(editor, SIGNAL(cursorPositionChanged()), this, SLOT(updateCursorPosition()));
}

void BaseTextEditor::appendStandardContextMenuActions(QMenu *menu)
{
    menu->addSeparator();
    Core::ActionManager *am = Core::ICore::instance()->actionManager();

    QAction *a = am->command(Core::Constants::CUT)->action();
    if (a && a->isEnabled())
        menu->addAction(a);
    a = am->command(Core::Constants::COPY)->action();
    if (a && a->isEnabled())
        menu->addAction(a);
    a = am->command(Core::Constants::PASTE)->action();
    if (a && a->isEnabled())
        menu->addAction(a);
}


BaseTextEditorEditable::~BaseTextEditorEditable()
{
    delete m_toolBar;
    delete e;
}

QWidget *BaseTextEditorEditable::toolBar()
{
    return m_toolBar;
}

int BaseTextEditorEditable::find(const QString &) const
{
    return 0;
}

int BaseTextEditorEditable::currentLine() const
{
    return e->textCursor().blockNumber() + 1;
}

int BaseTextEditorEditable::currentColumn() const
{
    QTextCursor cursor = e->textCursor();
    return cursor.position() - cursor.block().position() + 1;
}

QRect BaseTextEditorEditable::cursorRect(int pos) const
{
    QTextCursor tc = e->textCursor();
    if (pos >= 0)
        tc.setPosition(pos);
    QRect result = e->cursorRect(tc);
    result.moveTo(e->viewport()->mapToGlobal(result.topLeft()));
    return result;
}

QString BaseTextEditorEditable::contents() const
{
    return e->toPlainText();
}

QString BaseTextEditorEditable::selectedText() const
{
    if (e->textCursor().hasSelection())
        return e->textCursor().selectedText();
    return QString();
}

QString BaseTextEditorEditable::textAt(int pos, int length) const
{
    QTextCursor c = e->textCursor();

    if (pos < 0)
        pos = 0;
    c.movePosition(QTextCursor::End);
    if (pos + length > c.position())
        length = c.position() - pos;

    c.setPosition(pos);
    c.setPosition(pos + length, QTextCursor::KeepAnchor);

    return c.selectedText();
}

void BaseTextEditorEditable::remove(int length)
{
    QTextCursor tc = e->textCursor();
    tc.setPosition(tc.position() + length, QTextCursor::KeepAnchor);
    tc.removeSelectedText();
}

void BaseTextEditorEditable::insert(const QString &string)
{
    QTextCursor tc = e->textCursor();
    tc.insertText(string);
}

void BaseTextEditorEditable::replace(int length, const QString &string)
{
    QTextCursor tc = e->textCursor();
    tc.setPosition(tc.position() + length, QTextCursor::KeepAnchor);
    tc.insertText(string);
}

void BaseTextEditorEditable::setCurPos(int pos)
{
    QTextCursor tc = e->textCursor();
    tc.setPosition(pos);
    e->setTextCursor(tc);
}

void BaseTextEditorEditable::select(int toPos)
{
    QTextCursor tc = e->textCursor();
    tc.setPosition(toPos, QTextCursor::KeepAnchor);
    e->setTextCursor(tc);
}

void BaseTextEditorEditable::updateCursorPosition()
{
    const QTextCursor cursor = e->textCursor();
    const QTextBlock block = cursor.block();
    const int line = block.blockNumber() + 1;
    const int column = cursor.position() - block.position();
    m_cursorPositionLabel->setText(tr("Line: %1, Col: %2").arg(line).arg(e->tabSettings().columnAt(block.text(), column)+1),
                                   tr("Line: %1, Col: 999").arg(e->blockCount()));
    m_contextHelpId.clear();

    if (!block.isVisible())
        e->ensureCursorVisible();

}

QString BaseTextEditorEditable::contextHelpId() const
{
    if (m_contextHelpId.isEmpty())
        emit const_cast<BaseTextEditorEditable*>(this)->contextHelpIdRequested(e->editableInterface(),
                                                                               e->textCursor().position());
    return m_contextHelpId;
}


TextBlockUserData::~TextBlockUserData()
{
    TextMarks marks = m_marks;
    m_marks.clear();
    foreach (ITextMark *mrk, marks) {
        mrk->removedFromEditor();
    }
}