Hello all,
I have a Cocoa-made text editor involving an extension of the
"MultiplePageView"
class from the TextEdit source code. One of its functionalities is the
ability
to transform a rectangular region of a page (selected by the user) into
several columns (each corresponding to a new NSTextView object).
To compute the coordinates of this rectangular region, I use
the -selectedRange method of NSTextView and the
-lineFragmentRectForGlyphAtIndex: method of NSLayoutManager
(basically, the rect I want to compute is the union of the
lineFragmentRect of all the glyphs in the selected range).
The surprising thing is, to make my code work I have
to execute
[myLayoutManager lineFragmentRectForGlyphAtIndex:myGlyphIndex
effectiveRange:NULL] twice in order to get the correct result. The first call
to this method yields a wrong value for one of the coordinates of the
rectangle :
(gdb) p lm
$9 = (class NSLayoutManager *) 0x4641620
(gdb) p (NSRect) [lm lineFragmentRectForGlyphAtIndex:42025]
$10 = {
origin = {
x = 67,
y = 509
},
size = {
width = 461,
height = 23
}
}
(gdb) p (NSRect) [lm lineFragmentRectForGlyphAtIndex:42025]
$11 = {
origin = {
x = 67,
y = 65728
},
size = {
width = 461,
height = 23
}
}
The corresponding part of my code is as follows :
@implementation NSLayoutManager (LayoutManagerAdditions)
-(NSRect)lineFragmentRectForGlyphAtIndex:(unsigned)aGlyphIndex
{
unsigned theContainerIndex=[self
textContainerPositiveIndexForGlyphAtIndex:aGlyphIndex];
NSTextContainer* theContainer=[[self textContainers]
objectAtPositiveIndex:theContainerIndex];
NSTextView* theTextView=[theContainer textView];
NSRect theRect=[self lineFragmentRectForGlyphAtIndex:aGlyphIndex
effectiveRange:NULL];
theRect=[theTextView convertRect:theRect toView:[theTextView
superview]]; return theRect;
}
(...)
@end
Can anyone explain to me what's going on here ? Should i use another
method of
NSLayoutManager to compute this selected rectangle's coordinates ?
TIA,
Ewan
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