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-rw-r--r--accessible/base/TextAttrs.cpp819
1 files changed, 819 insertions, 0 deletions
diff --git a/accessible/base/TextAttrs.cpp b/accessible/base/TextAttrs.cpp
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+++ b/accessible/base/TextAttrs.cpp
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "TextAttrs.h"
+
+#include "LocalAccessible-inl.h"
+#include "AccAttributes.h"
+#include "nsAccUtils.h"
+#include "nsCoreUtils.h"
+#include "StyleInfo.h"
+
+#include "gfxTextRun.h"
+#include "nsFontMetrics.h"
+#include "nsLayoutUtils.h"
+#include "nsContainerFrame.h"
+#include "nsStyleUtil.h"
+#include "HyperTextAccessible.h"
+#include "mozilla/AppUnits.h"
+#include "mozilla/gfx/2D.h"
+
+using namespace mozilla;
+using namespace mozilla::a11y;
+
+////////////////////////////////////////////////////////////////////////////////
+// TextAttrsMgr
+////////////////////////////////////////////////////////////////////////////////
+
+void TextAttrsMgr::GetAttributes(AccAttributes* aAttributes,
+ uint32_t* aStartOffset, uint32_t* aEndOffset) {
+ // 1. Hyper text accessible must be specified always.
+ // 2. Offset accessible must be specified in
+ // the case of text attributes. Result hyper text offsets are optional if you
+ // just want the attributes for a single text Accessible.
+ // 3. Offset accessible and result hyper text offsets must not be specified
+ // but include default text attributes flag and attributes list must be
+ // specified in the case of default text attributes.
+ MOZ_ASSERT(
+ mHyperTextAcc && ((mOffsetAcc && mOffsetAccIdx != -1) ||
+ (!mOffsetAcc && mOffsetAccIdx == -1 && !aStartOffset &&
+ !aEndOffset && mIncludeDefAttrs && aAttributes)),
+ "Wrong usage of TextAttrsMgr!");
+
+ // Embedded objects are combined into own range with empty attributes set.
+ if (mOffsetAcc && !mOffsetAcc->IsText()) {
+ if (!aStartOffset) {
+ return;
+ }
+ for (int32_t childIdx = mOffsetAccIdx - 1; childIdx >= 0; childIdx--) {
+ LocalAccessible* currAcc = mHyperTextAcc->LocalChildAt(childIdx);
+ if (currAcc->IsText()) break;
+
+ (*aStartOffset)--;
+ }
+
+ uint32_t childCount = mHyperTextAcc->ChildCount();
+ for (uint32_t childIdx = mOffsetAccIdx + 1; childIdx < childCount;
+ childIdx++) {
+ LocalAccessible* currAcc = mHyperTextAcc->LocalChildAt(childIdx);
+ if (currAcc->IsText()) break;
+
+ (*aEndOffset)++;
+ }
+
+ return;
+ }
+
+ // Get the content and frame of the accessible. In the case of document
+ // accessible it's role content and root frame.
+ nsIContent* hyperTextElm = mHyperTextAcc->GetContent();
+ if (!hyperTextElm) {
+ return; // XXX: we don't support text attrs on document with no body
+ }
+
+ nsIFrame* rootFrame = mHyperTextAcc->GetFrame();
+ if (!rootFrame) {
+ return;
+ }
+
+ nsIContent *offsetNode = nullptr, *offsetElm = nullptr;
+ nsIFrame* frame = nullptr;
+ if (mOffsetAcc) {
+ offsetNode = mOffsetAcc->GetContent();
+ offsetElm = nsCoreUtils::GetDOMElementFor(offsetNode);
+ MOZ_ASSERT(offsetElm, "No element for offset accessible!");
+ if (!offsetElm) return;
+
+ frame = offsetElm->GetPrimaryFrame();
+ }
+
+ // "language" text attribute
+ LangTextAttr langTextAttr(mHyperTextAcc, hyperTextElm, offsetNode);
+
+ // "aria-invalid" text attribute
+ InvalidTextAttr invalidTextAttr(hyperTextElm, offsetNode);
+
+ // "background-color" text attribute
+ BGColorTextAttr bgColorTextAttr(rootFrame, frame);
+
+ // "color" text attribute
+ ColorTextAttr colorTextAttr(rootFrame, frame);
+
+ // "font-family" text attribute
+ FontFamilyTextAttr fontFamilyTextAttr(rootFrame, frame);
+
+ // "font-size" text attribute
+ FontSizeTextAttr fontSizeTextAttr(rootFrame, frame);
+
+ // "font-style" text attribute
+ FontStyleTextAttr fontStyleTextAttr(rootFrame, frame);
+
+ // "font-weight" text attribute
+ FontWeightTextAttr fontWeightTextAttr(rootFrame, frame);
+
+ // "auto-generated" text attribute
+ AutoGeneratedTextAttr autoGenTextAttr(mHyperTextAcc, mOffsetAcc);
+
+ // "text-underline(line-through)-style(color)" text attributes
+ TextDecorTextAttr textDecorTextAttr(rootFrame, frame);
+
+ // "text-position" text attribute
+ TextPosTextAttr textPosTextAttr(rootFrame, frame, hyperTextElm, offsetNode);
+
+ TextAttr* attrArray[] = {
+ &langTextAttr, &invalidTextAttr, &bgColorTextAttr,
+ &colorTextAttr, &fontFamilyTextAttr, &fontSizeTextAttr,
+ &fontStyleTextAttr, &fontWeightTextAttr, &autoGenTextAttr,
+ &textDecorTextAttr, &textPosTextAttr};
+
+ // Expose text attributes if applicable.
+ if (aAttributes) {
+ for (uint32_t idx = 0; idx < ArrayLength(attrArray); idx++) {
+ attrArray[idx]->Expose(aAttributes, mIncludeDefAttrs);
+ }
+ }
+
+ // Expose text attributes range where they are applied if applicable.
+ if (aStartOffset) {
+ GetRange(attrArray, ArrayLength(attrArray), aStartOffset, aEndOffset);
+ }
+}
+
+void TextAttrsMgr::GetRange(TextAttr* aAttrArray[], uint32_t aAttrArrayLen,
+ uint32_t* aStartOffset, uint32_t* aEndOffset) {
+ // Navigate backward from anchor accessible to find start offset.
+ for (int32_t childIdx = mOffsetAccIdx - 1; childIdx >= 0; childIdx--) {
+ LocalAccessible* currAcc = mHyperTextAcc->LocalChildAt(childIdx);
+
+ // Stop on embedded accessible since embedded accessibles are combined into
+ // own range.
+ if (!currAcc->IsText()) break;
+
+ MOZ_ASSERT(nsCoreUtils::GetDOMElementFor(currAcc->GetContent()),
+ "Text accessible has to have an associated DOM element");
+
+ bool offsetFound = false;
+ for (uint32_t attrIdx = 0; attrIdx < aAttrArrayLen; attrIdx++) {
+ TextAttr* textAttr = aAttrArray[attrIdx];
+ if (!textAttr->Equal(currAcc)) {
+ offsetFound = true;
+ break;
+ }
+ }
+
+ if (offsetFound) break;
+
+ *(aStartOffset) -= nsAccUtils::TextLength(currAcc);
+ }
+
+ // Navigate forward from anchor accessible to find end offset.
+ uint32_t childLen = mHyperTextAcc->ChildCount();
+ for (uint32_t childIdx = mOffsetAccIdx + 1; childIdx < childLen; childIdx++) {
+ LocalAccessible* currAcc = mHyperTextAcc->LocalChildAt(childIdx);
+ if (!currAcc->IsText()) break;
+
+ MOZ_ASSERT(nsCoreUtils::GetDOMElementFor(currAcc->GetContent()),
+ "Text accessible has to have an associated DOM element");
+
+ bool offsetFound = false;
+ for (uint32_t attrIdx = 0; attrIdx < aAttrArrayLen; attrIdx++) {
+ TextAttr* textAttr = aAttrArray[attrIdx];
+
+ // Alter the end offset when text attribute changes its value and stop
+ // the search.
+ if (!textAttr->Equal(currAcc)) {
+ offsetFound = true;
+ break;
+ }
+ }
+
+ if (offsetFound) break;
+
+ (*aEndOffset) += nsAccUtils::TextLength(currAcc);
+ }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// LangTextAttr
+////////////////////////////////////////////////////////////////////////////////
+
+TextAttrsMgr::LangTextAttr::LangTextAttr(HyperTextAccessible* aRoot,
+ nsIContent* aRootElm, nsIContent* aElm)
+ : TTextAttr<nsString>(!aElm), mRootContent(aRootElm) {
+ aRoot->Language(mRootNativeValue);
+ mIsRootDefined = !mRootNativeValue.IsEmpty();
+
+ if (aElm) {
+ nsCoreUtils::GetLanguageFor(aElm, mRootContent, mNativeValue);
+ mIsDefined = !mNativeValue.IsEmpty();
+ }
+}
+
+TextAttrsMgr::LangTextAttr::~LangTextAttr() {}
+
+bool TextAttrsMgr::LangTextAttr::GetValueFor(LocalAccessible* aAccessible,
+ nsString* aValue) {
+ nsCoreUtils::GetLanguageFor(aAccessible->GetContent(), mRootContent, *aValue);
+ return !aValue->IsEmpty();
+}
+
+void TextAttrsMgr::LangTextAttr::ExposeValue(AccAttributes* aAttributes,
+ const nsString& aValue) {
+ RefPtr<nsAtom> lang = NS_Atomize(aValue);
+ aAttributes->SetAttribute(nsGkAtoms::language, lang);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// InvalidTextAttr
+////////////////////////////////////////////////////////////////////////////////
+
+TextAttrsMgr::InvalidTextAttr::InvalidTextAttr(nsIContent* aRootElm,
+ nsIContent* aElm)
+ : TTextAttr<uint32_t>(!aElm), mRootElm(aRootElm) {
+ mIsRootDefined = GetValue(mRootElm, &mRootNativeValue);
+ if (aElm) mIsDefined = GetValue(aElm, &mNativeValue);
+}
+
+bool TextAttrsMgr::InvalidTextAttr::GetValueFor(LocalAccessible* aAccessible,
+ uint32_t* aValue) {
+ nsIContent* elm = nsCoreUtils::GetDOMElementFor(aAccessible->GetContent());
+ return elm ? GetValue(elm, aValue) : false;
+}
+
+void TextAttrsMgr::InvalidTextAttr::ExposeValue(AccAttributes* aAttributes,
+ const uint32_t& aValue) {
+ switch (aValue) {
+ case eFalse:
+ aAttributes->SetAttribute(nsGkAtoms::invalid, nsGkAtoms::_false);
+ break;
+
+ case eGrammar:
+ aAttributes->SetAttribute(nsGkAtoms::invalid, nsGkAtoms::grammar);
+ break;
+
+ case eSpelling:
+ aAttributes->SetAttribute(nsGkAtoms::invalid, nsGkAtoms::spelling);
+ break;
+
+ case eTrue:
+ aAttributes->SetAttribute(nsGkAtoms::invalid, nsGkAtoms::_true);
+ break;
+ }
+}
+
+bool TextAttrsMgr::InvalidTextAttr::GetValue(nsIContent* aElm,
+ uint32_t* aValue) {
+ nsIContent* elm = aElm;
+ do {
+ if (nsAccUtils::HasDefinedARIAToken(elm, nsGkAtoms::aria_invalid)) {
+ static dom::Element::AttrValuesArray tokens[] = {
+ nsGkAtoms::_false, nsGkAtoms::grammar, nsGkAtoms::spelling, nullptr};
+
+ int32_t idx = nsAccUtils::FindARIAAttrValueIn(
+ elm->AsElement(), nsGkAtoms::aria_invalid, tokens, eCaseMatters);
+ switch (idx) {
+ case 0:
+ *aValue = eFalse;
+ return true;
+ case 1:
+ *aValue = eGrammar;
+ return true;
+ case 2:
+ *aValue = eSpelling;
+ return true;
+ default:
+ *aValue = eTrue;
+ return true;
+ }
+ }
+ } while ((elm = elm->GetParent()) && elm != mRootElm);
+
+ return false;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// BGColorTextAttr
+////////////////////////////////////////////////////////////////////////////////
+
+TextAttrsMgr::BGColorTextAttr::BGColorTextAttr(nsIFrame* aRootFrame,
+ nsIFrame* aFrame)
+ : TTextAttr<nscolor>(!aFrame), mRootFrame(aRootFrame) {
+ mIsRootDefined = GetColor(mRootFrame, &mRootNativeValue);
+ if (aFrame) mIsDefined = GetColor(aFrame, &mNativeValue);
+}
+
+bool TextAttrsMgr::BGColorTextAttr::GetValueFor(LocalAccessible* aAccessible,
+ nscolor* aValue) {
+ nsIContent* elm = nsCoreUtils::GetDOMElementFor(aAccessible->GetContent());
+ if (elm) {
+ nsIFrame* frame = elm->GetPrimaryFrame();
+ if (frame) {
+ return GetColor(frame, aValue);
+ }
+ }
+ return false;
+}
+
+void TextAttrsMgr::BGColorTextAttr::ExposeValue(AccAttributes* aAttributes,
+ const nscolor& aValue) {
+ aAttributes->SetAttribute(nsGkAtoms::backgroundColor, Color{aValue});
+}
+
+bool TextAttrsMgr::BGColorTextAttr::GetColor(nsIFrame* aFrame,
+ nscolor* aColor) {
+ nscolor backgroundColor = aFrame->StyleBackground()->BackgroundColor(aFrame);
+ if (NS_GET_A(backgroundColor) > 0) {
+ *aColor = backgroundColor;
+ return true;
+ }
+
+ nsContainerFrame* parentFrame = aFrame->GetParent();
+ if (!parentFrame) {
+ *aColor = aFrame->PresContext()->DefaultBackgroundColor();
+ return true;
+ }
+
+ // Each frame of parents chain for the initially passed 'aFrame' has
+ // transparent background color. So background color isn't changed from
+ // 'mRootFrame' to initially passed 'aFrame'.
+ if (parentFrame == mRootFrame) return false;
+
+ return GetColor(parentFrame, aColor);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// ColorTextAttr
+////////////////////////////////////////////////////////////////////////////////
+
+TextAttrsMgr::ColorTextAttr::ColorTextAttr(nsIFrame* aRootFrame,
+ nsIFrame* aFrame)
+ : TTextAttr<nscolor>(!aFrame) {
+ mRootNativeValue = aRootFrame->StyleText()->mColor.ToColor();
+ mIsRootDefined = true;
+
+ if (aFrame) {
+ mNativeValue = aFrame->StyleText()->mColor.ToColor();
+ mIsDefined = true;
+ }
+}
+
+bool TextAttrsMgr::ColorTextAttr::GetValueFor(LocalAccessible* aAccessible,
+ nscolor* aValue) {
+ nsIContent* elm = nsCoreUtils::GetDOMElementFor(aAccessible->GetContent());
+ if (elm) {
+ if (nsIFrame* frame = elm->GetPrimaryFrame()) {
+ *aValue = frame->StyleText()->mColor.ToColor();
+ return true;
+ }
+ }
+ return false;
+}
+
+void TextAttrsMgr::ColorTextAttr::ExposeValue(AccAttributes* aAttributes,
+ const nscolor& aValue) {
+ aAttributes->SetAttribute(nsGkAtoms::color, Color{aValue});
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// FontFamilyTextAttr
+////////////////////////////////////////////////////////////////////////////////
+
+TextAttrsMgr::FontFamilyTextAttr::FontFamilyTextAttr(nsIFrame* aRootFrame,
+ nsIFrame* aFrame)
+ : TTextAttr<nsString>(!aFrame) {
+ mIsRootDefined = GetFontFamily(aRootFrame, mRootNativeValue);
+
+ if (aFrame) mIsDefined = GetFontFamily(aFrame, mNativeValue);
+}
+
+bool TextAttrsMgr::FontFamilyTextAttr::GetValueFor(LocalAccessible* aAccessible,
+ nsString* aValue) {
+ nsIContent* elm = nsCoreUtils::GetDOMElementFor(aAccessible->GetContent());
+ if (elm) {
+ nsIFrame* frame = elm->GetPrimaryFrame();
+ if (frame) {
+ return GetFontFamily(frame, *aValue);
+ }
+ }
+ return false;
+}
+
+void TextAttrsMgr::FontFamilyTextAttr::ExposeValue(AccAttributes* aAttributes,
+ const nsString& aValue) {
+ RefPtr<nsAtom> family = NS_Atomize(aValue);
+ aAttributes->SetAttribute(nsGkAtoms::font_family, family);
+}
+
+bool TextAttrsMgr::FontFamilyTextAttr::GetFontFamily(nsIFrame* aFrame,
+ nsString& aFamily) {
+ RefPtr<nsFontMetrics> fm =
+ nsLayoutUtils::GetFontMetricsForFrame(aFrame, 1.0f);
+
+ gfxFontGroup* fontGroup = fm->GetThebesFontGroup();
+ RefPtr<gfxFont> font = fontGroup->GetFirstValidFont();
+ gfxFontEntry* fontEntry = font->GetFontEntry();
+ aFamily.Append(NS_ConvertUTF8toUTF16(fontEntry->FamilyName()));
+ return true;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// FontSizeTextAttr
+////////////////////////////////////////////////////////////////////////////////
+
+TextAttrsMgr::FontSizeTextAttr::FontSizeTextAttr(nsIFrame* aRootFrame,
+ nsIFrame* aFrame)
+ : TTextAttr<nscoord>(!aFrame) {
+ mDC = aRootFrame->PresContext()->DeviceContext();
+
+ mRootNativeValue = aRootFrame->StyleFont()->mSize.ToAppUnits();
+ mIsRootDefined = true;
+
+ if (aFrame) {
+ mNativeValue = aFrame->StyleFont()->mSize.ToAppUnits();
+ mIsDefined = true;
+ }
+}
+
+bool TextAttrsMgr::FontSizeTextAttr::GetValueFor(LocalAccessible* aAccessible,
+ nscoord* aValue) {
+ nsIContent* el = nsCoreUtils::GetDOMElementFor(aAccessible->GetContent());
+ if (el) {
+ nsIFrame* frame = el->GetPrimaryFrame();
+ if (frame) {
+ *aValue = frame->StyleFont()->mSize.ToAppUnits();
+ return true;
+ }
+ }
+ return false;
+}
+
+void TextAttrsMgr::FontSizeTextAttr::ExposeValue(AccAttributes* aAttributes,
+ const nscoord& aValue) {
+ // Convert from nscoord to pt.
+ //
+ // Note: according to IA2, "The conversion doesn't have to be exact.
+ // The intent is to give the user a feel for the size of the text."
+ //
+ // ATK does not specify a unit and will likely follow IA2 here.
+ //
+ // XXX todo: consider sharing this code with layout module? (bug 474621)
+ float px = NSAppUnitsToFloatPixels(aValue, mozilla::AppUnitsPerCSSPixel());
+ // Each pt is 4/3 of a CSS pixel.
+ FontSize fontSize{NS_lround(px * 3 / 4)};
+
+ aAttributes->SetAttribute(nsGkAtoms::font_size, fontSize);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// FontStyleTextAttr
+////////////////////////////////////////////////////////////////////////////////
+
+TextAttrsMgr::FontStyleTextAttr::FontStyleTextAttr(nsIFrame* aRootFrame,
+ nsIFrame* aFrame)
+ : TTextAttr<FontSlantStyle>(!aFrame) {
+ mRootNativeValue = aRootFrame->StyleFont()->mFont.style;
+ mIsRootDefined = true;
+
+ if (aFrame) {
+ mNativeValue = aFrame->StyleFont()->mFont.style;
+ mIsDefined = true;
+ }
+}
+
+bool TextAttrsMgr::FontStyleTextAttr::GetValueFor(LocalAccessible* aAccessible,
+ FontSlantStyle* aValue) {
+ nsIContent* elm = nsCoreUtils::GetDOMElementFor(aAccessible->GetContent());
+ if (elm) {
+ nsIFrame* frame = elm->GetPrimaryFrame();
+ if (frame) {
+ *aValue = frame->StyleFont()->mFont.style;
+ return true;
+ }
+ }
+ return false;
+}
+
+void TextAttrsMgr::FontStyleTextAttr::ExposeValue(
+ AccAttributes* aAttributes, const FontSlantStyle& aValue) {
+ if (aValue.IsNormal()) {
+ aAttributes->SetAttribute(nsGkAtoms::font_style, nsGkAtoms::normal);
+ } else if (aValue.IsItalic()) {
+ RefPtr<nsAtom> atom = NS_Atomize("italic");
+ aAttributes->SetAttribute(nsGkAtoms::font_style, atom);
+ } else {
+ nsAutoCString s;
+ aValue.ToString(s);
+ nsString wide;
+ CopyUTF8toUTF16(s, wide);
+ aAttributes->SetAttribute(nsGkAtoms::font_style, std::move(wide));
+ }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// FontWeightTextAttr
+////////////////////////////////////////////////////////////////////////////////
+
+TextAttrsMgr::FontWeightTextAttr::FontWeightTextAttr(nsIFrame* aRootFrame,
+ nsIFrame* aFrame)
+ : TTextAttr<FontWeight>(!aFrame) {
+ mRootNativeValue = GetFontWeight(aRootFrame);
+ mIsRootDefined = true;
+
+ if (aFrame) {
+ mNativeValue = GetFontWeight(aFrame);
+ mIsDefined = true;
+ }
+}
+
+bool TextAttrsMgr::FontWeightTextAttr::GetValueFor(LocalAccessible* aAccessible,
+ FontWeight* aValue) {
+ nsIContent* elm = nsCoreUtils::GetDOMElementFor(aAccessible->GetContent());
+ if (elm) {
+ nsIFrame* frame = elm->GetPrimaryFrame();
+ if (frame) {
+ *aValue = GetFontWeight(frame);
+ return true;
+ }
+ }
+ return false;
+}
+
+void TextAttrsMgr::FontWeightTextAttr::ExposeValue(AccAttributes* aAttributes,
+ const FontWeight& aValue) {
+ int value = aValue.ToIntRounded();
+ aAttributes->SetAttribute(nsGkAtoms::fontWeight, value);
+}
+
+FontWeight TextAttrsMgr::FontWeightTextAttr::GetFontWeight(nsIFrame* aFrame) {
+ // nsFont::width isn't suitable here because it's necessary to expose real
+ // value of font weight (used font might not have some font weight values).
+ RefPtr<nsFontMetrics> fm =
+ nsLayoutUtils::GetFontMetricsForFrame(aFrame, 1.0f);
+
+ gfxFontGroup* fontGroup = fm->GetThebesFontGroup();
+ RefPtr<gfxFont> font = fontGroup->GetFirstValidFont();
+
+ // When there doesn't exist a bold font in the family and so the rendering of
+ // a non-bold font face is changed so that the user sees what looks like a
+ // bold font, i.e. synthetic bolding is used. (Simply returns false on any
+ // platforms that don't use the multi-strike synthetic bolding.)
+ if (font->ApplySyntheticBold()) {
+ return FontWeight::BOLD;
+ }
+
+ // On Windows, font->GetStyle()->weight will give the same weight as
+ // fontEntry->Weight(), the weight of the first font in the font group,
+ // which may not be the weight of the font face used to render the
+ // characters. On Mac, font->GetStyle()->weight will just give the same
+ // number as getComputedStyle(). fontEntry->Weight() will give the weight
+ // range supported by the font face used, so we clamp the weight that was
+ // requested by style to what is actually supported by the font.
+ gfxFontEntry* fontEntry = font->GetFontEntry();
+ return fontEntry->Weight().Clamp(font->GetStyle()->weight);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// AutoGeneratedTextAttr
+////////////////////////////////////////////////////////////////////////////////
+TextAttrsMgr::AutoGeneratedTextAttr::AutoGeneratedTextAttr(
+ HyperTextAccessible* aHyperTextAcc, LocalAccessible* aAccessible)
+ : TTextAttr<bool>(!aAccessible) {
+ mRootNativeValue = false;
+ mIsRootDefined = false;
+
+ if (aAccessible) {
+ mIsDefined = mNativeValue =
+ ((aAccessible->NativeRole() == roles::STATICTEXT) ||
+ (aAccessible->NativeRole() == roles::LISTITEM_MARKER));
+ }
+}
+
+bool TextAttrsMgr::AutoGeneratedTextAttr::GetValueFor(
+ LocalAccessible* aAccessible, bool* aValue) {
+ return *aValue = (aAccessible->NativeRole() == roles::STATICTEXT);
+}
+
+void TextAttrsMgr::AutoGeneratedTextAttr::ExposeValue(
+ AccAttributes* aAttributes, const bool& aValue) {
+ aAttributes->SetAttribute(nsGkAtoms::auto_generated, aValue);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// TextDecorTextAttr
+////////////////////////////////////////////////////////////////////////////////
+
+TextAttrsMgr::TextDecorValue::TextDecorValue(nsIFrame* aFrame) {
+ const nsStyleTextReset* textReset = aFrame->StyleTextReset();
+ mStyle = textReset->mTextDecorationStyle;
+ mColor = textReset->mTextDecorationColor.CalcColor(aFrame);
+ mLine =
+ textReset->mTextDecorationLine & (StyleTextDecorationLine::UNDERLINE |
+ StyleTextDecorationLine::LINE_THROUGH);
+}
+
+TextAttrsMgr::TextDecorTextAttr::TextDecorTextAttr(nsIFrame* aRootFrame,
+ nsIFrame* aFrame)
+ : TTextAttr<TextDecorValue>(!aFrame) {
+ mRootNativeValue = TextDecorValue(aRootFrame);
+ mIsRootDefined = mRootNativeValue.IsDefined();
+
+ if (aFrame) {
+ mNativeValue = TextDecorValue(aFrame);
+ mIsDefined = mNativeValue.IsDefined();
+ }
+}
+
+bool TextAttrsMgr::TextDecorTextAttr::GetValueFor(LocalAccessible* aAccessible,
+ TextDecorValue* aValue) {
+ nsIContent* elm = nsCoreUtils::GetDOMElementFor(aAccessible->GetContent());
+ if (elm) {
+ nsIFrame* frame = elm->GetPrimaryFrame();
+ if (frame) {
+ *aValue = TextDecorValue(frame);
+ return aValue->IsDefined();
+ }
+ }
+ return false;
+}
+
+void TextAttrsMgr::TextDecorTextAttr::ExposeValue(
+ AccAttributes* aAttributes, const TextDecorValue& aValue) {
+ if (aValue.IsUnderline()) {
+ RefPtr<nsAtom> underlineStyle =
+ StyleInfo::TextDecorationStyleToAtom(aValue.Style());
+ aAttributes->SetAttribute(nsGkAtoms::textUnderlineStyle, underlineStyle);
+
+ aAttributes->SetAttribute(nsGkAtoms::textUnderlineColor,
+ Color{aValue.Color()});
+ return;
+ }
+
+ if (aValue.IsLineThrough()) {
+ RefPtr<nsAtom> lineThroughStyle =
+ StyleInfo::TextDecorationStyleToAtom(aValue.Style());
+ aAttributes->SetAttribute(nsGkAtoms::textLineThroughStyle,
+ lineThroughStyle);
+
+ aAttributes->SetAttribute(nsGkAtoms::textLineThroughColor,
+ Color{aValue.Color()});
+ }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// TextPosTextAttr
+////////////////////////////////////////////////////////////////////////////////
+
+TextAttrsMgr::TextPosTextAttr::TextPosTextAttr(nsIFrame* aRootFrame,
+ nsIFrame* aFrame,
+ nsIContent* aRootElm,
+ nsIContent* aElm)
+ : TTextAttr<Maybe<TextPosValue>>(!aFrame && !aElm), mRootElm(aRootElm) {
+ // Get the text-position values for the roots and children.
+ // If we find an ARIA text-position value on a DOM element - searching up
+ // from the supplied root DOM element - use the associated frame as the root
+ // frame. This ensures that we're using the proper root frame for comparison.
+ nsIFrame* ariaFrame = nullptr;
+ Maybe<TextPosValue> rootAria = GetAriaTextPosValue(aRootElm, ariaFrame);
+ if (rootAria && ariaFrame) {
+ aRootFrame = ariaFrame;
+ }
+ Maybe<TextPosValue> rootLayout = GetLayoutTextPosValue(aRootFrame);
+ Maybe<TextPosValue> childLayout;
+ Maybe<TextPosValue> childAria;
+ if (aFrame) {
+ childLayout = GetLayoutTextPosValue(aFrame);
+ }
+ if (aElm) {
+ childAria = GetAriaTextPosValue(aElm);
+ }
+
+ // Aria values take precedence over layout values.
+ mIsRootDefined = rootAria || rootLayout;
+ mRootNativeValue = rootAria ? rootAria : rootLayout;
+ mIsDefined = childAria || childLayout;
+ mNativeValue = childAria ? childAria : childLayout;
+
+ // If there's no child text-position information from ARIA, and the child
+ // layout info is equivalent to the root layout info (i.e., it's inherited),
+ // then we should prefer the root information.
+ if (!childAria && childLayout == rootLayout) {
+ mIsDefined = false;
+ }
+}
+
+bool TextAttrsMgr::TextPosTextAttr::GetValueFor(LocalAccessible* aAccessible,
+ Maybe<TextPosValue>* aValue) {
+ nsIContent* elm = nsCoreUtils::GetDOMElementFor(aAccessible->GetContent());
+ if (elm) {
+ nsIFrame* frame = elm->GetPrimaryFrame();
+ if (frame) {
+ Maybe<TextPosValue> layoutValue = GetLayoutTextPosValue(frame);
+ Maybe<TextPosValue> ariaValue = GetAriaTextPosValue(elm);
+
+ *aValue = ariaValue ? ariaValue : layoutValue;
+ return aValue->isSome();
+ }
+ }
+ return false;
+}
+
+void TextAttrsMgr::TextPosTextAttr::ExposeValue(
+ AccAttributes* aAttributes, const Maybe<TextPosValue>& aValue) {
+ if (aValue.isNothing()) {
+ return;
+ }
+
+ RefPtr<nsAtom> atom = nullptr;
+ switch (*aValue) {
+ case eTextPosBaseline:
+ atom = nsGkAtoms::baseline;
+ break;
+
+ case eTextPosSub:
+ atom = nsGkAtoms::sub;
+ break;
+
+ case eTextPosSuper:
+ atom = NS_Atomize("super");
+ break;
+ }
+
+ if (atom) {
+ aAttributes->SetAttribute(nsGkAtoms::textPosition, atom);
+ }
+}
+
+Maybe<TextAttrsMgr::TextPosValue>
+TextAttrsMgr::TextPosTextAttr::GetAriaTextPosValue(nsIContent* aElm) const {
+ nsIFrame* ariaFrame = nullptr;
+ return GetAriaTextPosValue(aElm, ariaFrame);
+}
+
+Maybe<TextAttrsMgr::TextPosValue>
+TextAttrsMgr::TextPosTextAttr::GetAriaTextPosValue(nsIContent* aElm,
+ nsIFrame*& ariaFrame) const {
+ // Search for the superscript and subscript roles that imply text-position.
+ const nsIContent* elm = aElm;
+ do {
+ if (elm->IsElement()) {
+ const mozilla::dom::Element* domElm = elm->AsElement();
+ static const dom::Element::AttrValuesArray tokens[] = {
+ nsGkAtoms::subscript, nsGkAtoms::superscript, nullptr};
+ const int32_t valueIdx = domElm->FindAttrValueIn(
+ kNameSpaceID_None, nsGkAtoms::role, tokens, eCaseMatters);
+ ariaFrame = domElm->GetPrimaryFrame();
+ if (valueIdx == 0) {
+ return Some(eTextPosSub);
+ }
+ if (valueIdx == 1) {
+ return Some(eTextPosSuper);
+ }
+ }
+ } while ((elm = elm->GetParent()) && elm != mRootElm);
+
+ ariaFrame = nullptr;
+ return Nothing{};
+}
+
+Maybe<TextAttrsMgr::TextPosValue>
+TextAttrsMgr::TextPosTextAttr::GetLayoutTextPosValue(nsIFrame* aFrame) const {
+ const auto& verticalAlign = aFrame->StyleDisplay()->mVerticalAlign;
+ if (verticalAlign.IsKeyword()) {
+ switch (verticalAlign.AsKeyword()) {
+ case StyleVerticalAlignKeyword::Baseline:
+ return Some(eTextPosBaseline);
+ case StyleVerticalAlignKeyword::Sub:
+ return Some(eTextPosSub);
+ case StyleVerticalAlignKeyword::Super:
+ return Some(eTextPosSuper);
+ // No good guess for the rest, so do not expose value of text-position
+ // attribute.
+ default:
+ return Nothing{};
+ }
+ }
+
+ const auto& length = verticalAlign.AsLength();
+ if (length.ConvertsToPercentage()) {
+ const float percentValue = length.ToPercentage();
+ return percentValue > 0 ? Some(eTextPosSuper)
+ : (percentValue < 0 ? Some(eTextPosSub)
+ : Some(eTextPosBaseline));
+ }
+
+ if (length.ConvertsToLength()) {
+ const nscoord coordValue = length.ToLength();
+ return coordValue > 0
+ ? Some(eTextPosSuper)
+ : (coordValue < 0 ? Some(eTextPosSub) : Some(eTextPosBaseline));
+ }
+
+ if (const nsIContent* content = aFrame->GetContent()) {
+ if (content->IsHTMLElement(nsGkAtoms::sup)) return Some(eTextPosSuper);
+ if (content->IsHTMLElement(nsGkAtoms::sub)) return Some(eTextPosSub);
+ }
+
+ return Nothing{};
+}