QGraphicsTextItem ensure cursor visible

[laszlo.gosztola]

Hi,

I have a very simple text editor based on QGraphicsTextItem. I would like to ensure that the blinking cursor is visible if I move the cursor. How can I get the actual cursor position? (The coordinates, not the character number)
I have implemented scroll bar in my editor so I can easily scroll to any part of the text, just I need to know the cursor's actual coordinate in the document. Is it possible?

(I cannot use QTextEdit in a proxy widget, but I think, what I need is a similar function to QTextEdit's ensurecursorvisible)

[high_flyer]

(I cannot use QTextEdit in a proxy widget,

Why not?

just I need to know the cursor's actual coordinate in the document.

Wont this do?:

myGraphicsTextItem->textCursor().position();

myGraphicsTextItem->textCursor().position();

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[laszlo.gosztola]

Why not?

Because of performance problems and the boss don't want it

myGraphicsTextItem->textCursor().position();

No, it just gives me the character number in the text. (e.g.: the cursor is at the 149th character in the document, but I don't know the coordinates of it)

[high_flyer]

Without using QTextEdit, I think you will have to go low level for that.

[laszlo.gosztola]

At last I found the way:

QGraphicsTextItem::keyPressEvent(event);
QTextBlock block = document()->findBlock(textCursor().position());
QTextLine line = block.layout()->lineForTextPosition(textCursor().positionInBlock());
qreal cursor_y_position = document()->documentLayout()->blockBoundingRect(block).y() + line.y();
qreal line_height = line.height();
qDebug("New cursor position: %.2f %.2f", cursor_y_position, line_height);
if ( _actual_position > cursor_y_position )
{
    ScrollToPosition(cursor_y_position);
}
if ((_actual_position + _height) < (cursor_y_position + line_height))
{
    ScrollToPosition(cursor_y_position + line_height - _height);
}

QGraphicsTextItem::keyPressEvent(event);
QTextBlock block = document()->findBlock(textCursor().position());
QTextLine line = block.layout()->lineForTextPosition(textCursor().positionInBlock());
qreal cursor_y_position = document()->documentLayout()->blockBoundingRect(block).y() + line.y();
qreal line_height = line.height();
qDebug("New cursor position: %.2f %.2f", cursor_y_position, line_height);
if ( _actual_position > cursor_y_position )
{
    ScrollToPosition(cursor_y_position);
}
if ((_actual_position + _height) < (cursor_y_position + line_height))
{
    ScrollToPosition(cursor_y_position + line_height - _height);
}

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[steno]

Nice Code snippet, but what are actual_position and _height?

Does actual_position = textCursor().position() and _height = document().size().height()?