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Re: How to know the geometry of a string on the screen ?


From: Bertrand Gmail
Subject: Re: How to know the geometry of a string on the screen ?
Date: Sun, 29 Oct 2017 12:58:40 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1



Le 29/10/2017 à 11:30, David Chisnall a écrit :
On 27 Oct 2017, at 20:34, Bertrand Gmail <address@hidden> wrote:
Le 27/10/2017 à 20:36, Josh Freeman a écrit :
I think you meant to use 'string', not '[NSString string]' - the latter returns 
an empty string.

stringSize=[[NSString string] sizeWithAttributes:attributes];
  ->
stringSize=[string sizeWithAttributes:attributes];

I introduced  [NSString string] because of this warning at compile time :

GSPanel.m:75:23: warning: 'NSMutableAttributedString' may not respond to
      'sizeWithAttributes:'
   stringSize=[string sizeWithAttributes:attributes];

And the executable doesn't work.
But now you are asking what the length of an empty string is, when a set of 
attributes are applied.  You want to be asking what the length of @“GNUstep” 
is.  You do not need to construct an NSAttributedString to call a method on 
NSString.
Thanks for your answer. So I can't just use a method of NSString on an NSattributedString.

I just wanted to put a centered label as a subview of a window (a simple UI element indeed), using a boldSystemFont attribute. So I needed to calculate the size of the attributed string. And I don't need line wrapping.
Josh's "[string size]" advice seems to be the way to go.

Moreover, I could put "string.size" instead of "[string size]". But I wonder if it ist an Objc-2 feature and if it will compile with gcc and it's libobjc.

I use somewhere else in my code :

 "screenFrame = [[NSScreen mainScreen] frame];
  screenSize = screenFrame.size;"

Is it also Objc-2 only ?
I ask because I wanted to be Objc-1 only and I tried "[screenFrame size]" instead but it doesn't work : I've got this message from the compiler :

 "error: bad receiver type 'NSRect' (aka 'struct _NSRect')
  screenSize = [screenFrame size];"

That's not a big deal because I already I had another more complicated code for this borrowed from the internet. It's my will to understand what's going wrong there.

Cheers,
Bertrand




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