Re: [NSTextStorage/NSAttributedString] How can we know the height of a rendered string?
Re: [NSTextStorage/NSAttributedString] How can we know the height of a rendered string?
- Subject: Re: [NSTextStorage/NSAttributedString] How can we know the height of a rendered string?
- From: Jean-Daniel Dupas <email@hidden>
- Date: Sun, 6 Jul 2008 23:26:06 +0200
Le 6 juil. 08 à 21:25, Stéphane Sudre a écrit :
Problem:
--------
I would like/need to know the height that would be required to
render a string inside a fixed width box.
Solution that does not work:
----------------------------
So far, I've been using a solution found from a google search and
which looks like this:
- (float) heightOfString:(NSString *) inString forFont:(NSFont *)
inFont andMaxWidth:(float) inMaxWidth
{
float tHeight=0;
if (inString!=nil)
{
NSTextStorage * tTextStorage;
tTextStorage=[[NSTextStorage alloc] initWithString:inString];
if (tTextStorage!=nil)
{
NSTextContainer * tTextContainer;
tTextContainer = [[NSTextContainer alloc] initWithContainerSize:
NSMakeSize(inMaxWidth, FLT_MAX)];
if (tTextContainer!=nil)
{
NSLayoutManager * tLayoutManager = [[NSLayoutManager alloc] init];
tLayoutManager = [[NSLayoutManager alloc] init];
if (tLayoutManager!=nil)
{
[tLayoutManager addTextContainer:tTextContainer];
[tTextStorage addLayoutManager:tLayoutManager];
[tTextStorage addAttribute:NSFontAttributeName value:inFont
range:NSMakeRange(0, [tTextStorage length])];
[tTextContainer setLineFragmentPadding:0.0];
[tLayoutManager glyphRangeForTextContainer:tTextContainer];
tHeight=NSHeight([tLayoutManager
usedRectForTextContainer:tTextContainer]);
[tLayoutManager release];
}
[tTextContainer release];
}
[tTextStorage release];
}
}
return tHeight;
}
usedRectForTextContainer: causes neither glyph generation nor layout,
and so the result is may be inaccurate (the layout manager may be
computing the layout in background and does not have finish).
You have to make sure it is ready before using this function.
[tLayoutManager ensureLayoutForTextContainer:tTextContainer];
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