[SOLVED] Creating editor without scrolling

Yakov Eremin

Hello!
I want to create editor, which will change it's size for content (without scroll). I take QPlainTextEdit, and make next connection:

connect(ui->plainTextEdit->document()->documentLayout(), 
SIGNAL(documentSizeChanged(QSizeF)),
SLOT(editorSizeChanged(QSizeF)));

And in slot I take received height, and multiply it to pixels height of one line:

 QFont font("", 0);
 QFontMetrics fm(font);
 int pixelsHigh = fm.lineSpacing(); 
 ui->plainTextEdit->setFixedHeight((inSize.height()+1)*pixelsHigh);

This construction works perfectly until we have < 5 lines in editor. After that in the bottom of the editor appears extra space, and scrollbar at right.

What i'm doing wrong ?
Minimal example

mrjj

Hi and welcome
Have a look at
QAbstractScrollArea::setVerticalScrollBarPolicy()
QAbstractScrollArea::setHorizontalScrollBarPolicy( )

and the Qt::ScrollBarAlwaysOff value

Yakov Eremin

@mrjj scrollbars already disabled in Qt Designer. Problem actually in extra space, which causes incorrect size computing.

mrjj

@Yakov-Eremin
hi
I think your issue is that you use another font for getting line height than the actual editor and
since you multiply then slowly the space grows.

try with

void MainWindow::editorSizeChanged(QSizeF inSize)
{
QFont font=ui->plainTextEdit->font();
.....

Yakov Eremin

@mrjj thank you, the problem is solved

mrjj

@Yakov-Eremin
you're welcome.
Very good with the mini sample !