Start next text block below another text block in a QTextDocument

[guru]

Hi,
Currently I used a Qtextedit and separate text as blocks and gives different colors for each blocks, I use QTextblockFormat in QTextDocument. This display each block one by one, but I need parallel blocks, Following is my code,

@QTextDocument* myDocument = new QTextDocument(ui->textedit);
textedit->setDocument(myDocument);
QTextCursor* myCursor = new QTextCursor(myDocument);

QTextBlockFormat format;
format.setNonBreakableLines(true);
format.setBackground(Qt::green);
format.setAlignment(Qt::AlignHCenter);

myCursor->setBlockFormat(format);
myCursor->insertText("Block1 ");


format.setBackground(Qt::red);
myCursor->insertBlock(format);
myCursor->insertText("Block2 ");
myCursor->insertHtml("<br>");
myCursor->insertText("Block2");


format.setBackground(Qt::yellow);
myCursor->insertBlock(format);
myCursor->insertText("Block3");@