how to detect when QTextEdit's content is too large to fit

[giotto]

I wan't to detect to when the content is to large.
For example: if my QTextEdit can show 4 lines of text, but it has 5 lines now.

There should be a way, 'cause if Qt::ScrollBarAsNeeded is set, then when I reach the fifth line, QTextEdit has a Scrollbar. I tried to find the signal which is detected when Qt::ScrollBarAsNeeded is on, but I did'n find anything.

Do you have any idea?

giotto

[The Storm]

Perhaps you can use the signal textChanged() and in it to chek if QTextEdit::horizontalScrollBar() will return a valid pointer, if not then there is still no a scrollbar so the text is not too large.

[giotto]

Perhaps you can use the signal textChanged() and in it to chek if QTextEdit::horizontalScrollBar() will return a valid pointer, if not then there is still no a scrollbar so the text is not too large.

Is there a way to check that the ponter is valid?
Hmmmm, does this if I set Qt::ScrollBarAlwaysOff?

[The Storm]

Dunno for the flags but the pointer you can check very easy

if (horizontalScrollBar()) // The ponter is valid
   // some code...
else // The pointer is not valid
   // some other code...

if (horizontalScrollBar()) // The ponter is valid
   // some code...
else // The pointer is not valid
   // some other code...

To copy to clipboard, switch view to plain text mode 

[giotto]

Dunno for the flags but the pointer you can check very easy

if (horizontalScrollBar()) // The ponter is valid
   // some code...
else // The pointer is not valid
   // some other code...

if (horizontalScrollBar()) // The ponter is valid
   // some code...
else // The pointer is not valid
   // some other code...

To copy to clipboard, switch view to plain text mode 

this if is always true....

[wysota]

Because the bar is always there, it's just hidden. Check its value range instead or check if the bar isVisible().

[giotto]

this is working solution

connect(editor->verticalScrollBar(),SIGNAL(rangeChanged(int,int)),this,SLOT(echoNewRange(int,int)));

connect(editor->verticalScrollBar(),SIGNAL(rangeChanged(int,int)),this,SLOT(echoNewRange(int,int)));

To copy to clipboard, switch view to plain text mode