C++ QTextDocument::lastBlock方法代码示例

QString ChatEdit::textEditToPlainText()
{
	QTextDocument *doc = document();
	QString result;
	result.reserve(doc->characterCount());
	QTextCursor begin(doc);
	QTextCursor end;
	QString specialChar = QChar(QChar::ObjectReplacementCharacter);
	bool first = true;
	while (!begin.atEnd()) {
		end = doc->find(specialChar, begin, QTextDocument::FindCaseSensitively);
		QString postValue;
		bool atEnd = end.isNull();
		if (atEnd) {
			end = QTextCursor(doc);
			QTextBlock block = doc->lastBlock();
			end.setPosition(block.position() + block.length() - 1);
		} else {
			postValue = end.charFormat().toolTip();
		}
		begin.movePosition(QTextCursor::Right, QTextCursor::KeepAnchor,
						   end.position() - begin.position() - (atEnd ? 0 : 1));
		QString selectionText = begin.selection().toPlainText();
		if (!first)
			result += selectionText.midRef(1);
		else
			result += selectionText;
		result += postValue;
		begin = end;
		end.clearSelection();
		first = false;
	}
	return result;
}

QTextBlock QTextDocumentProto::lastBlock() const
{
  QTextDocument *item = qscriptvalue_cast<QTextDocument*>(thisObject());
  if (item)
    return item->lastBlock();
  return QTextBlock();
}

void UBTGAdaptableText::setCursorToTheEnd()
{
    QTextDocument* doc = document();
    if(NULL != doc){
        QTextBlock block = doc->lastBlock();
        QTextCursor cursor(doc);
        cursor.setPosition(block.position() + block.length() - 1);
        setTextCursor(cursor);
    }
}

int AutoCompleter::paragraphSeparatorAboutToBeInserted(QTextCursor &cursor,
                                                       const TabSettings &tabSettings)
{
    if (!m_autoParenthesesEnabled)
        return 0;

    QTextDocument *doc = cursor.document();
    if (doc->characterAt(cursor.position() - 1) != QLatin1Char('{'))
        return 0;

    if (!contextAllowsAutoParentheses(cursor))
        return 0;

    // verify that we indeed do have an extra opening brace in the document
    QTextBlock block = cursor.block();
    const QString textFromCusror = block.text().mid(cursor.positionInBlock()).trimmed();
    int braceDepth = TextDocumentLayout::braceDepth(doc->lastBlock());

    if (braceDepth <= 0 && (textFromCusror.isEmpty() || textFromCusror.at(0) != QLatin1Char('}')))
        return 0; // braces are all balanced or worse, no need to do anything and separator inserted not between '{' and '}'

    // we have an extra brace , let's see if we should close it

    /* verify that the next block is not further intended compared to the current block.
       This covers the following case:

            if (condition) {|
                statement;
    */
    int indentation = tabSettings.indentationColumn(block.text());

    if (block.next().isValid()) { // not the last block
        block = block.next();
        //skip all empty blocks
        while (block.isValid() && tabSettings.onlySpace(block.text()))
            block = block.next();
        if (block.isValid()
                && tabSettings.indentationColumn(block.text()) > indentation)
            return 0;
    }

    const QString &textToInsert = insertParagraphSeparator(cursor);
    int pos = cursor.position();
    cursor.insertBlock();
    cursor.insertText(textToInsert);
    cursor.setPosition(pos);

    // if we actually insert a separator, allow it to be overwritten if
    // user types it
    if (!textToInsert.isEmpty())
        m_allowSkippingOfBlockEnd = true;

    return 1;
}

QPair<int, int> getFirstAndLastVisiblePosition(Editor *editor)
{
  QTextCursor cursor = editor->textCursor();
  QTextDocument *doc = editor->document();
  int currentLine = doc->findBlock(cursor.position()).blockNumber();
  int cursorHeight = editor->cursorRect().height();
  int lineCountToFirstVisibleLine = editor->cursorRect().top() / cursorHeight;
  int firstVisibleLineNum = currentLine - lineCountToFirstVisibleLine;
  if (firstVisibleLineNum < 0) {
    firstVisibleLineNum = 0;
  }
  int maxLineNumOnScreen = (editor->viewport()->height() / cursorHeight);
  if (maxLineNumOnScreen < 1) {
    maxLineNumOnScreen = 1;
  }
  int firstPos = doc->findBlockByNumber(firstVisibleLineNum).position();
  int lastVisibleLineNum = firstVisibleLineNum + maxLineNumOnScreen - 1;
  QTextBlock lastVisibleTextBlock = doc->findBlockByNumber(lastVisibleLineNum);
  if (!lastVisibleTextBlock.isValid()) {
    lastVisibleTextBlock = doc->lastBlock();
  }
  int lastPos = lastVisibleTextBlock.position() + lastVisibleTextBlock.length() - 1;
  return QPair<int, int>(firstPos, lastPos);
}