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Bug 1176973 - [NSAccessibility] Expose attribute AXMathLineThickness for fraction bars. r=MarcoZ

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This commit is contained in:
Frederic Wang 2015-07-02 06:01:00 +02:00
parent b948d306f7
commit 256e11ee0b
1 changed files with 22 additions and 6 deletions
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28
accessible/mac/mozAccessible.mm
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@ -25,6 +25,7 @@
#include "nsCoord.h"
#include "nsObjCExceptions.h"
#include "nsWhitespaceTokenizer.h"
#include <prdtoa.h>
using namespace mozilla;
using namespace mozilla::a11y;
@ -38,11 +39,11 @@ using namespace mozilla::a11y;
#define NSAccessibilityMathSuperscriptAttribute @"AXMathSuperscript"
#define NSAccessibilityMathUnderAttribute @"AXMathUnder"
#define NSAccessibilityMathOverAttribute @"AXMathOver"
#define NSAccessibilityMathLineThicknessAttribute @"AXMathLineThickness"
// XXX WebKit also defines the following attributes.
// See bugs 1176970, 1176973 and 1176983.
// See bugs 1176970 and 1176983.
// - NSAccessibilityMathFencedOpenAttribute @"AXMathFencedOpen"
// - NSAccessibilityMathFencedCloseAttribute @"AXMathFencedClose"
// - NSAccessibilityMathLineThicknessAttribute @"AXMathLineThickness"
// - NSAccessibilityMathPrescriptsAttribute @"AXMathPrescripts"
// - NSAccessibilityMathPostscriptsAttribute @"AXMathPostscripts"
@ -172,8 +173,7 @@ ConvertToNSArray(nsTArray<Accessible*>& aArray)
case roles::MATHML_FRACTION:
[additional addObject:NSAccessibilityMathFractionNumeratorAttribute];
[additional addObject:NSAccessibilityMathFractionDenominatorAttribute];
// XXX bug 1176973
// WebKit also defines NSAccessibilityMathLineThicknessAttribute
[additional addObject:NSAccessibilityMathLineThicknessAttribute];
break;
case roles::MATHML_SUB:
case roles::MATHML_SUP:
@ -422,8 +422,24 @@ ConvertToNSArray(nsTArray<Accessible*>& aArray)
return [self childAt:0];
if ([attribute isEqualToString:NSAccessibilityMathFractionDenominatorAttribute])
return [self childAt:1];
// XXX bug 1176973
// WebKit also defines NSAccessibilityMathLineThicknessAttribute
if ([attribute isEqualToString:NSAccessibilityMathLineThicknessAttribute]) {
// WebKit sets line thickness to some logical value parsed in the
// renderer object of the <mfrac> element. It's not clear whether the
// exact value is relevant to assistive technologies. From a semantic
// point of view, the only important point is to distinguish between
// <mfrac> elements that have a fraction bar and those that do not.
// Per the MathML 3 spec, the latter happens iff the linethickness
// attribute is of the form [zero-float][optional-unit]. In that case we
// set line thickness to zero and in the other cases we set it to one.
nsCOMPtr<nsIPersistentProperties> attributes = accWrap->Attributes();
nsAutoString thickness;
nsAccUtils::GetAccAttr(attributes, nsGkAtoms::linethickness_, thickness);
double value = 1.0;
if (!thickness.IsEmpty())
value = PR_strtod(NS_LossyConvertUTF16toASCII(thickness).get(),
nullptr);
return [NSNumber numberWithInteger:(value ? 1 : 0)];
}
break;
case roles::MATHML_SUB:
if ([attribute isEqualToString:NSAccessibilityMathBaseAttribute])