зеркало из https://github.com/mozilla/gecko-dev.git
114 строки
2.8 KiB
Plaintext
114 строки
2.8 KiB
Plaintext
/* -*- (Mode: Objective-C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset:) 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#import "MOXMathAccessibles.h"
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#import "MacUtils.h"
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using namespace mozilla::a11y;
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// XXX WebKit also defines the following attributes.
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// See bugs 1176970 and 1176983.
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// - NSAccessibilityMathFencedOpenAttribute @"AXMathFencedOpen"
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// - NSAccessibilityMathFencedCloseAttribute @"AXMathFencedClose"
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// - NSAccessibilityMathPrescriptsAttribute @"AXMathPrescripts"
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// - NSAccessibilityMathPostscriptsAttribute @"AXMathPostscripts"
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@implementation MOXMathRootAccessible
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- (id)moxMathRootRadicand {
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return [self childAt:0];
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}
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- (id)moxMathRootIndex {
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return [self childAt:1];
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}
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@end
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@implementation MOXMathSquareRootAccessible
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- (id)moxMathRootRadicand {
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return [self childAt:0];
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}
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@end
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@implementation MOXMathFractionAccessible
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- (id)moxMathFractionNumerator {
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return [self childAt:0];
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}
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- (id)moxMathFractionDenominator {
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return [self childAt:1];
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}
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// Bug 1639745: This doesn't actually work.
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- (NSNumber*)moxMathLineThickness {
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// WebKit sets line thickness to some logical value parsed in the
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// renderer object of the <mfrac> element. It's not clear whether the
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// exact value is relevant to assistive technologies. From a semantic
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// point of view, the only important point is to distinguish between
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// <mfrac> elements that have a fraction bar and those that do not.
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// Per the MathML 3 spec, the latter happens iff the linethickness
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// attribute is of the form [zero-float][optional-unit]. In that case we
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// set line thickness to zero and in the other cases we set it to one.
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if (NSString* thickness = utils::GetAccAttr(self, "thickness")) {
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NSNumberFormatter* formatter = [[[NSNumberFormatter alloc] init] autorelease];
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NSNumber* value = [formatter numberFromString:thickness];
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return [NSNumber numberWithBool:[value boolValue]];
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} else {
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return [NSNumber numberWithInteger:0];
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}
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}
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@end
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@implementation MOXMathSubSupAccessible
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- (id)moxMathBase {
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return [self childAt:0];
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}
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- (id)moxMathSubscript {
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if (mRole == roles::MATHML_SUP) {
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return nil;
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}
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return [self childAt:1];
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}
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- (id)moxMathSuperscript {
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if (mRole == roles::MATHML_SUB) {
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return nil;
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}
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return [self childAt:mRole == roles::MATHML_SUP ? 1 : 2];
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}
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@end
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@implementation MOXMathUnderOverAccessible
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- (id)moxMathBase {
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return [self childAt:0];
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}
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- (id)moxMathUnder {
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if (mRole == roles::MATHML_OVER) {
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return nil;
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}
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return [self childAt:1];
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}
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- (id)moxMathOver {
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if (mRole == roles::MATHML_UNDER) {
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return nil;
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}
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return [self childAt:mRole == roles::MATHML_OVER ? 1 : 2];
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}
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@end
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