C++ QTextBlock::setVisible方法代码示例

void MessagesDialog::sinkMessage( const MsgEvent *msg )
{
    QMutexLocker locker( &messageLocker );

    QPlainTextEdit *messages = ui.messages;
    /* Only scroll if the viewport is at the end.
       Don't bug user by auto-changing/losing viewport on insert(). */
    bool b_autoscroll = ( messages->verticalScrollBar()->value()
                          + messages->verticalScrollBar()->pageStep()
                          >= messages->verticalScrollBar()->maximum() );

    /* Copy selected text to the clipboard */
    if( messages->textCursor().hasSelection() )
        messages->copy();

    /* Fix selected text bug */
    if( !messages->textCursor().atEnd() ||
         messages->textCursor().anchor() != messages->textCursor().position() )
         messages->moveCursor( QTextCursor::End );

    /* Start a new logic block so we can hide it on-demand */
    messages->textCursor().insertBlock();

    QString buf = QString( "<i><font color='darkblue'>%1</font>" ).arg( msg->module );

    switch ( msg->priority )
    {
        case VLC_MSG_INFO:
            buf += "<font color='blue'> info: </font>";
            break;
        case VLC_MSG_ERR:
            buf += "<font color='red'> error: </font>";
            break;
        case VLC_MSG_WARN:
            buf += "<font color='green'> warning: </font>";
            break;
        case VLC_MSG_DBG:
        default:
            buf += "<font color='grey'> debug: </font>";
            break;
    }

    /* Insert the prefix */
    messages->textCursor().insertHtml( buf /* + "</i>" */ );

    /* Insert the message */
    messages->textCursor().insertHtml( msg->text );

    /* Pass the new message thru the filter */
    QTextBlock b = messages->document()->lastBlock();
    b.setVisible( matchFilter( b.text() ) );

    /* Tell the QTextDocument to recompute the size of the given area */
    messages->document()->markContentsDirty( b.position(), b.length() );

    if ( b_autoscroll ) messages->ensureCursorVisible();
}

void CCodeEditor::foldBlocks( int line_start , int line_end ){
    QTextBlock bstart = document()->findBlockByLineNumber( line_start );

    if( !bstart.isValid())
	return;

    for(int i=line_start; i<line_end && bstart.isValid() ;i++){
	bstart.setVisible( false );
	bstart = bstart.next();
    }

    viewport()->update();
    lineNumberArea->update();
    m_foldArea->update();
}

void JSEdit::unfold(int line)
{
    QTextBlock startBlock = document()->findBlockByNumber(line - 1);
    int endPos = findClosingConstruct(startBlock);

    QTextBlock block = startBlock.next();
    while (block.isValid() && !block.isVisible()) {
        block.setVisible(true);
        block.setLineCount(block.layout()->lineCount());
        endPos = block.position() + block.length();
        block = block.next();
    }

    document()->markContentsDirty(startBlock.position(), endPos - startBlock.position() + 1);
    updateSidebar();
    update();

    JSDocLayout *layout = reinterpret_cast<JSDocLayout*>(document()->documentLayout());
    layout->forceUpdate();
}

void MessagesDialog::filterMessages()
{
    QMutexLocker locker( &messageLocker );
    QPlainTextEdit *messages = ui.messages;
    QTextBlock block = messages->document()->firstBlock();

    while( block.isValid() )
    {
        block.setVisible( matchFilter( block.text().toLower() ) );
        block = block.next();
    }

    /* Consider the whole QTextDocument as dirty now */
    messages->document()->markContentsDirty( 0, messages->document()->characterCount() );

    /* FIXME This solves a bug (Qt?) with the viewport not resizing the
       vertical scroll bar when one or more QTextBlock are hidden */
    QSize vsize = messages->viewport()->size();
    messages->viewport()->resize( vsize + QSize( 1, 1 ) );
    messages->viewport()->resize( vsize );
}

void BaseTextDocumentLayout::FoldValidator::process(QTextBlock block)
{
    if (!m_layout)
        return;

    const QTextBlock &previous = block.previous();
    if (!previous.isValid())
        return;

    if ((BaseTextDocumentLayout::isFolded(previous)
            && !BaseTextDocumentLayout::canFold(previous))
            || (!BaseTextDocumentLayout::isFolded(previous)
                && BaseTextDocumentLayout::canFold(previous)
                && !block.isVisible())) {
        BaseTextDocumentLayout::setFolded(previous, !BaseTextDocumentLayout::isFolded(previous));
    }

    if (BaseTextDocumentLayout::isFolded(previous) && !m_insideFold)
        m_insideFold = BaseTextDocumentLayout::foldingIndent(block);

    bool toggleVisibility = false;
    if (m_insideFold) {
        if (BaseTextDocumentLayout::foldingIndent(block) >= m_insideFold) {
            if (block.isVisible())
                toggleVisibility = true;
        } else {
            m_insideFold = 0;
            if (!block.isVisible())
                toggleVisibility = true;
        }
    } else if (!block.isVisible()) {
        toggleVisibility = true;
    }

    if (toggleVisibility) {
        block.setVisible(!block.isVisible());
        block.setLineCount(block.isVisible() ? qMax(1, block.layout()->lineCount()) : 0);
        m_requestDocUpdate = true;
    }
}

void NCEdit::fold(int line) {
  QTextBlock startBlock = document()->findBlockByNumber(line - 1);
  int endPos = findClosingConstruct(startBlock);
  if (endPos < 0) return;
  QTextBlock endBlock = document()->findBlock(endPos);

  QTextBlock block = startBlock.next();
  while (block.isValid() && block != endBlock) {
    block.setVisible(false);
    block.setLineCount(0);
    block = block.next();
  }

  document()->markContentsDirty(startBlock.position(),
                                endPos - startBlock.position() + 1);
  updateSidebar();
  update();

  NCDocLayout *layout =
    reinterpret_cast<NCDocLayout*>(document()->documentLayout());
  layout->forceUpdate();
}

void BaseTextDocumentLayout::doFoldOrUnfold(const QTextBlock& block, bool unfold)
{
    if (!canFold(block))
        return;
    QTextBlock b = block.next();

    int indent = foldingIndent(block);
    while (b.isValid() && foldingIndent(b) > indent && (unfold || b.next().isValid())) {
        b.setVisible(unfold);
        b.setLineCount(unfold? qMax(1, b.layout()->lineCount()) : 0);
        if (unfold) { // do not unfold folded sub-blocks
            if (isFolded(b) && b.next().isValid()) {
                int jndent = foldingIndent(b);
                b = b.next();
                while (b.isValid() && foldingIndent(b) > jndent)
                    b = b.next();
                continue;
            }
        }
        b = b.next();
    }
    setFolded(block, !unfold);
}

void CodeEditor::contentsChange(int pos, int, int)
{
    QTextBlock block = textCursor().block();

    // сдвиг блока клавишей Return
    // состояние предыдущего блока может быть не верным
    if (block.userState() == Empty)
        block.setUserState(block.previous().userState() | Rehighligh);

    block = document()->findBlock(pos);

    int startBlockNum = block.blockNumber();

    bool forceUnfold = false;

    while (block.isValid()) {
        int previousState = block.userState();
        int state = setBlockState(block);

        if (!(previousState & Error) && !(state & Error) &&
            previousState & Comment  && state & Comment) {

            QTextBlock next = block.next();

            int nextBlockState = next.userState();
            setBlockState(next);
            next.setUserState(nextBlockState); // в начальное состояние

            // правильное состояние комментария известно
            // только после обработки последующей строки
            state = block.userState();
        }

        if (state != previousState) {

            if (!forceUnfold) { // разворачиваем предыдущие блоки
                QTextBlock previous = block.previous();

                while (previous.isValid()) {
                    int state = previous.userState();

                    if (!(state & Error) && state & Folded)
                        previous.setUserState(state & ~Folded);

                    if (state & Error || !(state & Nested) || previous.isVisible())
                        break;

                    previous.setVisible(true);
                    previous = previous.previous();
                }
            }

            forceUnfold = true;
        } else if (block.blockNumber() > startBlockNum && // не начальный блок
                   state & Begin && !(state & Nested)) {  // (state & Begin ...) пропускаем End главного блока
          break;                                          // без state & Error, иначе срабатывает между блоками
        }                                                 // при первом обновлении

        if (forceUnfold) { // разворачиваем последующие блоки

            if (!(state & Error) && state & Folded)
                state &= ~Folded;

            block.setVisible(true);
        }

        block.setUserState(state | Rehighligh);

        block = block.next();
    }
}

void TextBlockUserData::doCollapse(const QTextBlock& block, bool visible)
{
    QTextBlock info = block;
    if (block.userData() && static_cast<TextBlockUserData*>(block.userData())->collapseMode() == CollapseAfter)
        ;
    else if (block.next().userData()
             && static_cast<TextBlockUserData*>(block.next().userData())->collapseMode()
             == TextBlockUserData::CollapseThis)
        info = block.next();
    else {
        if (visible && !block.next().isVisible()) {
            // no match, at least unfold!
            QTextBlock b = block.next();
            while (b.isValid() && !b.isVisible()) {
                b.setVisible(true);
                b.setLineCount(visible ? qMax(1, b.layout()->lineCount()) : 0);
                b = b.next();
            }
        }
        return;
    }
    int pos = static_cast<TextBlockUserData*>(info.userData())->collapseAtPos();
    if (pos < 0)
        return;
    QTextCursor cursor(info);
    cursor.setPosition(cursor.position() + pos);
    if (matchCursorForward(&cursor) != Match) {
        if (visible) {
            // no match, at least unfold!
            QTextBlock b = block.next();
            while (b.isValid() && !b.isVisible()) {
                b.setVisible(true);
                b.setLineCount(visible ? qMax(1, b.layout()->lineCount()) : 0);
                b = b.next();
            }
        }
        return;
    }

    QTextBlock b = block.next();
    while (b < cursor.block()) {
        b.setVisible(visible);
        b.setLineCount(visible ? qMax(1, b.layout()->lineCount()) : 0);
        if (visible) {
            TextBlockUserData *data = canCollapse(b);
            if (data && data->collapsed()) {
                QTextBlock end =  testCollapse(b);
                if (data->collapseIncludesClosure())
                    end = end.next();
                if (end.isValid()) {
                    b = end;
                    continue;
                }
            }
        }
        b = b.next();
    }

    bool collapseIncludesClosure = hasClosingCollapseAtEnd(b);
    if (collapseIncludesClosure) {
        b.setVisible(visible);
        b.setLineCount(visible ? qMax(1, b.layout()->lineCount()) : 0);
    }
    static_cast<TextBlockUserData*>(info.userData())->setCollapseIncludesClosure(collapseIncludesClosure);
    static_cast<TextBlockUserData*>(info.userData())->setCollapsed(!block.next().isVisible());

}