How to find a line number after an Enter key press in QTextEdit.

jenya7

Say I have some lines in QTextEdit.

Line number 1
Line number 2
Line number 3

Now I press an Enter key after Line number 2 and it looks like this now

Line number 1
Line number 2
'\r'
Line number 3

Now I wont to get a line before the Enter key - Line number 2

So I can do like this

switch (keyEvent->key())
 {
      case Qt::Key_Return:
        {
             if (term_str.isEmpty())
              {
                        QTextDocument *doc = ui->textEditTerminalTx->document();
                        QTextBlock tb = doc->findBlockByLineNumber(???);
                        QString s = tb.text();
              }
     }
     break;
}

But how do I get a line number to put in doc->findBlockByLineNumber(???) ?

mpergand

To retrieve the block under the cursor, you can do:

QTextDocument *doc = ui->textEditTerminalTx->document();
//QTextCursor cursor=doc->textCursor();
QTextCursor cursor=ui->textEditTerminalTx->textCursor();
QTextBlock tb = cursor.block();

jenya7

@mpergand said in How to find a line number after ann Enter key in QTextEdit.:

To retrieve the block under the cursor, you can do:

QTextDocument *doc = ui->textEditTerminalTx->document();
QTextCursor cursor=doc->textCursor();
QTextBlock tb = cursor.block();

I need the line above the cursor - only one line above.

mpergand

int QTextCursor::blockNumber() const
Returns the number of the block the cursor is in, or 0 if the cursor is invalid.

jenya7

@mpergand
QTextCursor cursor=doc->textCursor();
I get - error: no member named 'textCursor' in 'QTextDocument'

mpergand

Sorry, it is:
ui->textEditTerminalTx->textCursor();

VRonin

QTextCursor cursor(ui->textEditTerminalTx->document());
const int oldPosition = cursor.position();
cursor.movePosition(QTextCursor::Up);
QString s = cursor.block().text();
cursor.setPosition(oldPosition); //restore the cursor

jenya7

@mpergand
Thank you. This way it works good.

QTextCursor cursor= ui->textEditTerminalTx->textCursor();
QTextBlock tb = cursor.block();
QString line = tb.text();

Always get the last line above the cursor. Exactly what I need.