I gave up on trying to find the magic formula of settings which would make my
custom subclassed NSTextFieldCell return the correct expansion frame, as the
cell which is returned by -[NSTableColumn dataCell] does. Instead, I overrode
expansionFrameWithFrame:inView:, replacing the multi-line frame returned by
super with a single-line frame which I calculate myself.
It solves the same problem when used in NSTokenFieldCell subclasses too.
Thanks again for the tip, Corbin.
/*!
@brief Calculates the expansion frame which is used to display the
entire text in a special expansion frame tool tip, if text is truncated.
@details This is a workaround for the fact that -[NSTableColumn dataCell],
even though it claims to be an NSTextFieldCell, must have some magic built
into it which allows the expansion frame tool tip to be calculated
correctly regardless of -wraps, -isScrollable, and -truncatesLastVisibleLine.
The [[NSTextFieldCell alloc] init] used to draw the text in this class
does not have that magic, so we calculate it from scratch, based on the
current attributed string value.
*/
- (NSRect)expansionFrameWithFrame:(NSRect)frame
inView:(NSView*)view {
NSRect expansionFrame = [super expansionFrameWithFrame:frame
inView:view] ;
// Since we are not using a magic NSTextFieldCell, the
// expansionFrame at this point may be no wider than the
// cell, and will be high enough to display the text if
// it were wrapped to multiple lines, which it does not.
// (You can get the correct rect if you setWraps:NO, but
// then the ellipsis does not show when drawing normally.)
// So we discard the size and use only the origin.
// Super does correctly return NSZeroRect if the text
// is not currently truncated, so we use that and do same.
if (
(expansionFrame.size.width == 0.0)
&&
(expansionFrame.size.height == 0.0)
) {
return NSZeroRect ;
}
NSAttributedString* as = [self attributedStringValue] ;
CGFloat height = frame.size.height ;
CGFloat width = [as widthForHeight:height] ;
expansionFrame.size.width = width ;
expansionFrame.size.height = height ;
return expansionFrame ;
}
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