The Tor Browser: accessible/src/base/TextAttrs.cpp@97036ab72558 (annotated)

accessible/src/base/TextAttrs.cpp@97036ab72558 (annotated)

accessible/src/base/TextAttrs.cpp

Tue, 06 Jan 2015 21:39:09 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Tue, 06 Jan 2015 21:39:09 +0100
branch: TOR_BUG_9701
changeset 8: 97036ab72558
permissions: -rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /* -*- 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 "Accessible-inl.h"
 #include "nsAccUtils.h"
 #include "nsCoreUtils.h"
 #include "StyleInfo.h"
 #include "gfxFont.h"
 #include "nsFontMetrics.h"
 #include "nsLayoutUtils.h"
 #include "HyperTextAccessible.h"
 #include "mozilla/AppUnits.h"
 #include "mozilla/gfx/2D.h"
 using namespace mozilla;
 using namespace mozilla::a11y;
 ////////////////////////////////////////////////////////////////////////////////
 // TextAttrsMgr
 ////////////////////////////////////////////////////////////////////////////////
 void
 TextAttrsMgr::GetAttributes(nsIPersistentProperties* aAttributes,
                             int32_t* aStartHTOffset,
                             int32_t* aEndHTOffset)
 {
   // 1. Hyper text accessible must be specified always.
   // 2. Offset accessible and result hyper text offsets must be specified in
   // the case of text attributes.
   // 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.
   NS_PRECONDITION(mHyperTextAcc &&
                   ((mOffsetAcc && mOffsetAccIdx != -1 &&
                     aStartHTOffset && aEndHTOffset) ||
                   (!mOffsetAcc && mOffsetAccIdx == -1 &&
                     !aStartHTOffset && !aEndHTOffset &&
                    mIncludeDefAttrs && aAttributes)),
                   "Wrong usage of TextAttrsMgr!");
   // Embedded objects are combined into own range with empty attributes set.
   if (mOffsetAcc && nsAccUtils::IsEmbeddedObject(mOffsetAcc)) {
     for (int32_t childIdx = mOffsetAccIdx - 1; childIdx >= 0; childIdx--) {
       Accessible* currAcc = mHyperTextAcc->GetChildAt(childIdx);
       if (!nsAccUtils::IsEmbeddedObject(currAcc))
         break;
       (*aStartHTOffset)--;
     }
     uint32_t childCount = mHyperTextAcc->ChildCount();
     for (uint32_t childIdx = mOffsetAccIdx + 1; childIdx < childCount;
          childIdx++) {
       Accessible* currAcc = mHyperTextAcc->GetChildAt(childIdx);
       if (!nsAccUtils::IsEmbeddedObject(currAcc))
         break;
       (*aEndHTOffset)++;
     }
     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();
   nsIFrame *rootFrame = mHyperTextAcc->GetFrame();
   NS_ASSERTION(rootFrame, "No frame for accessible!");
   if (!rootFrame)
     return;
   nsIContent *offsetNode = nullptr, *offsetElm = nullptr;
   nsIFrame *frame = nullptr;
   if (mOffsetAcc) {
     offsetNode = mOffsetAcc->GetContent();
     offsetElm = nsCoreUtils::GetDOMElementFor(offsetNode);
     NS_ASSERTION(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);
   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 (mOffsetAcc)
     GetRange(attrArray, ArrayLength(attrArray), aStartHTOffset, aEndHTOffset);
 }
 void
 TextAttrsMgr::GetRange(TextAttr* aAttrArray[], uint32_t aAttrArrayLen,
                        int32_t* aStartHTOffset, int32_t* aEndHTOffset)
 {
   // Navigate backward from anchor accessible to find start offset.
   for (int32_t childIdx = mOffsetAccIdx - 1; childIdx >= 0; childIdx--) {
     Accessible* currAcc = mHyperTextAcc->GetChildAt(childIdx);
     // Stop on embedded accessible since embedded accessibles are combined into
     // own range.
     if (nsAccUtils::IsEmbeddedObject(currAcc))
       break;
     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;
     *(aStartHTOffset) -= 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++) {
     Accessible* currAcc = mHyperTextAcc->GetChildAt(childIdx);
     if (nsAccUtils::IsEmbeddedObject(currAcc))
       break;
     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;
     (*aEndHTOffset) += 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(Accessible* aAccessible, nsString* aValue)
 {
   nsCoreUtils::GetLanguageFor(aAccessible->GetContent(), mRootContent, *aValue);
   return !aValue->IsEmpty();
 }
 void
 TextAttrsMgr::LangTextAttr::
   ExposeValue(nsIPersistentProperties* aAttributes, const nsString& aValue)
 {
   nsAccUtils::SetAccAttr(aAttributes, nsGkAtoms::language, aValue);
 }
 ////////////////////////////////////////////////////////////////////////////////
 // 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(Accessible* aAccessible, uint32_t* aValue)
 {
   nsIContent* elm = nsCoreUtils::GetDOMElementFor(aAccessible->GetContent());
   return elm ? GetValue(elm, aValue) : false;
 }
 void
 TextAttrsMgr::InvalidTextAttr::
   ExposeValue(nsIPersistentProperties* aAttributes, const uint32_t& aValue)
 {
   switch (aValue) {
     case eFalse:
       nsAccUtils::SetAccAttr(aAttributes, nsGkAtoms::invalid,
                              NS_LITERAL_STRING("false"));
       break;
     case eGrammar:
       nsAccUtils::SetAccAttr(aAttributes, nsGkAtoms::invalid,
                              NS_LITERAL_STRING("grammar"));
       break;
     case eSpelling:
       nsAccUtils::SetAccAttr(aAttributes, nsGkAtoms::invalid,
                              NS_LITERAL_STRING("spelling"));
       break;
     case eTrue:
       nsAccUtils::SetAccAttr(aAttributes, nsGkAtoms::invalid,
                              NS_LITERAL_STRING("true"));
       break;
   }
 }
 bool
 TextAttrsMgr::InvalidTextAttr::
   GetValue(nsIContent* aElm, uint32_t* aValue)
 {
   nsIContent* elm = aElm;
   do {
     if (nsAccUtils::HasDefinedARIAToken(elm, nsGkAtoms::aria_invalid)) {
       static nsIContent::AttrValuesArray tokens[] =
         { &nsGkAtoms::_false, &nsGkAtoms::grammar, &nsGkAtoms::spelling,
           nullptr };
       int32_t idx = elm->FindAttrValueIn(kNameSpaceID_None,
                                          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(Accessible* aAccessible, nscolor* aValue)
 {
   nsIContent* elm = nsCoreUtils::GetDOMElementFor(aAccessible->GetContent());
   nsIFrame* frame = elm->GetPrimaryFrame();
   return frame ? GetColor(frame, aValue) : false;
 }
 void
 TextAttrsMgr::BGColorTextAttr::
   ExposeValue(nsIPersistentProperties* aAttributes, const nscolor& aValue)
 {
   nsAutoString formattedValue;
   StyleInfo::FormatColor(aValue, formattedValue);
   nsAccUtils::SetAccAttr(aAttributes, nsGkAtoms::backgroundColor,
                          formattedValue);
 }
 bool
 TextAttrsMgr::BGColorTextAttr::
   GetColor(nsIFrame* aFrame, nscolor* aColor)
 {
   const nsStyleBackground* styleBackground = aFrame->StyleBackground();
   if (NS_GET_A(styleBackground->mBackgroundColor) > 0) {
     *aColor = styleBackground->mBackgroundColor;
     return true;
   }
   nsIFrame *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->StyleColor()->mColor;
   mIsRootDefined = true;
   if (aFrame) {
     mNativeValue = aFrame->StyleColor()->mColor;
     mIsDefined = true;
   }
 }
 bool
 TextAttrsMgr::ColorTextAttr::
   GetValueFor(Accessible* aAccessible, nscolor* aValue)
 {
   nsIContent* elm = nsCoreUtils::GetDOMElementFor(aAccessible->GetContent());
   nsIFrame* frame = elm->GetPrimaryFrame();
   if (frame) {
     *aValue = frame->StyleColor()->mColor;
     return true;
   }
   return false;
 }
 void
 TextAttrsMgr::ColorTextAttr::
   ExposeValue(nsIPersistentProperties* aAttributes, const nscolor& aValue)
 {
   nsAutoString formattedValue;
   StyleInfo::FormatColor(aValue, formattedValue);
   nsAccUtils::SetAccAttr(aAttributes, nsGkAtoms::color, formattedValue);
 }
 ////////////////////////////////////////////////////////////////////////////////
 // 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(Accessible* aAccessible, nsString* aValue)
 {
   nsIContent* elm = nsCoreUtils::GetDOMElementFor(aAccessible->GetContent());
   nsIFrame* frame = elm->GetPrimaryFrame();
   return frame ? GetFontFamily(frame, *aValue) : false;
 }
 void
 TextAttrsMgr::FontFamilyTextAttr::
   ExposeValue(nsIPersistentProperties* aAttributes, const nsString& aValue)
 {
   nsAccUtils::SetAccAttr(aAttributes, nsGkAtoms::font_family, aValue);
 }
 bool
 TextAttrsMgr::FontFamilyTextAttr::
   GetFontFamily(nsIFrame* aFrame, nsString& aFamily)
 {
   nsRefPtr<nsFontMetrics> fm;
   nsLayoutUtils::GetFontMetricsForFrame(aFrame, getter_AddRefs(fm));
   gfxFontGroup* fontGroup = fm->GetThebesFontGroup();
   gfxFont* font = fontGroup->GetFontAt(0);
   gfxFontEntry* fontEntry = font->GetFontEntry();
   aFamily = fontEntry->FamilyName();
   return true;
 }
 ////////////////////////////////////////////////////////////////////////////////
 // FontSizeTextAttr
 ////////////////////////////////////////////////////////////////////////////////
 TextAttrsMgr::FontSizeTextAttr::
   FontSizeTextAttr(nsIFrame* aRootFrame, nsIFrame* aFrame) :
   TTextAttr<nscoord>(!aFrame)
 {
   mDC = aRootFrame->PresContext()->DeviceContext();
   mRootNativeValue = aRootFrame->StyleFont()->mSize;
   mIsRootDefined = true;
   if (aFrame) {
     mNativeValue = aFrame->StyleFont()->mSize;
     mIsDefined = true;
   }
 }
 bool
 TextAttrsMgr::FontSizeTextAttr::
   GetValueFor(Accessible* aAccessible, nscoord* aValue)
 {
   nsIContent* content = nsCoreUtils::GetDOMElementFor(aAccessible->GetContent());
   nsIFrame* frame = content->GetPrimaryFrame();
   if (frame) {
     *aValue = frame->StyleFont()->mSize;
     return true;
   }
   return false;
 }
 void
 TextAttrsMgr::FontSizeTextAttr::
   ExposeValue(nsIPersistentProperties* 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.
   int pts = NS_lround(px*3/4);
   nsAutoString value;
   value.AppendInt(pts);
   value.Append(NS_LITERAL_STRING("pt"));
   nsAccUtils::SetAccAttr(aAttributes, nsGkAtoms::font_size, value);
 }
 ////////////////////////////////////////////////////////////////////////////////
 // FontStyleTextAttr
 ////////////////////////////////////////////////////////////////////////////////
 TextAttrsMgr::FontStyleTextAttr::
   FontStyleTextAttr(nsIFrame* aRootFrame, nsIFrame* aFrame) :
   TTextAttr<nscoord>(!aFrame)
 {
   mRootNativeValue = aRootFrame->StyleFont()->mFont.style;
   mIsRootDefined = true;
   if (aFrame) {
     mNativeValue = aFrame->StyleFont()->mFont.style;
     mIsDefined = true;
   }
 }
 bool
 TextAttrsMgr::FontStyleTextAttr::
   GetValueFor(Accessible* aAccessible, nscoord* aValue)
 {
   nsIContent* elm = nsCoreUtils::GetDOMElementFor(aAccessible->GetContent());
   nsIFrame* frame = elm->GetPrimaryFrame();
   if (frame) {
     *aValue = frame->StyleFont()->mFont.style;
     return true;
   }
   return false;
 }
 void
 TextAttrsMgr::FontStyleTextAttr::
   ExposeValue(nsIPersistentProperties* aAttributes, const nscoord& aValue)
 {
   nsAutoString formattedValue;
   StyleInfo::FormatFontStyle(aValue, formattedValue);
   nsAccUtils::SetAccAttr(aAttributes, nsGkAtoms::font_style, formattedValue);
 }
 ////////////////////////////////////////////////////////////////////////////////
 // FontWeightTextAttr
 ////////////////////////////////////////////////////////////////////////////////
 TextAttrsMgr::FontWeightTextAttr::
   FontWeightTextAttr(nsIFrame* aRootFrame, nsIFrame* aFrame) :
   TTextAttr<int32_t>(!aFrame)
 {
   mRootNativeValue = GetFontWeight(aRootFrame);
   mIsRootDefined = true;
   if (aFrame) {
     mNativeValue = GetFontWeight(aFrame);
     mIsDefined = true;
   }
 }
 bool
 TextAttrsMgr::FontWeightTextAttr::
   GetValueFor(Accessible* aAccessible, int32_t* aValue)
 {
   nsIContent* elm = nsCoreUtils::GetDOMElementFor(aAccessible->GetContent());
   nsIFrame* frame = elm->GetPrimaryFrame();
   if (frame) {
     *aValue = GetFontWeight(frame);
     return true;
   }
   return false;
 }
 void
 TextAttrsMgr::FontWeightTextAttr::
   ExposeValue(nsIPersistentProperties* aAttributes, const int32_t& aValue)
 {
   nsAutoString formattedValue;
   formattedValue.AppendInt(aValue);
   nsAccUtils::SetAccAttr(aAttributes, nsGkAtoms::fontWeight, formattedValue);
 }
 int32_t
 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).
   nsRefPtr<nsFontMetrics> fm;
   nsLayoutUtils::GetFontMetricsForFrame(aFrame, getter_AddRefs(fm));
   gfxFontGroup *fontGroup = fm->GetThebesFontGroup();
   gfxFont *font = fontGroup->GetFontAt(0);
   // 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. IsSyntheticBold method is only
   // needed on Mac, but it is "safe" to use on all platforms.  (For non-Mac
   // platforms it always return false.)
   if (font->IsSyntheticBold())
     return 700;
 #if defined(MOZ_WIDGET_GTK) || defined(MOZ_WIDGET_QT)
   // On Linux, font->GetStyle()->weight will give the absolute weight requested
   // of the font face. The Linux code uses the gfxFontEntry constructor which
   // doesn't initialize the weight field.
   return font->GetStyle()->weight;
 #else
   // 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 of the font
   // face used.
   gfxFontEntry *fontEntry = font->GetFontEntry();
   return fontEntry->Weight();
 #endif
 }
 ////////////////////////////////////////////////////////////////////////////////
 // AutoGeneratedTextAttr
 ////////////////////////////////////////////////////////////////////////////////
 TextAttrsMgr::AutoGeneratedTextAttr::
   AutoGeneratedTextAttr(HyperTextAccessible* aHyperTextAcc,
                         Accessible* aAccessible) :
   TTextAttr<bool>(!aAccessible)
 {
   mRootNativeValue = false;
   mIsRootDefined = false;
   if (aAccessible)
     mIsDefined = mNativeValue = (aAccessible->NativeRole() == roles::STATICTEXT);
 }
 bool
 TextAttrsMgr::AutoGeneratedTextAttr::
   GetValueFor(Accessible* aAccessible, bool* aValue)
 {
   return *aValue = (aAccessible->NativeRole() == roles::STATICTEXT);
 }
 void
 TextAttrsMgr::AutoGeneratedTextAttr::
   ExposeValue(nsIPersistentProperties* aAttributes, const bool& aValue)
 {
   nsAccUtils::SetAccAttr(aAttributes, nsGkAtoms::auto_generated,
                          aValue ? NS_LITERAL_STRING("true") : NS_LITERAL_STRING("false"));
 }
 ////////////////////////////////////////////////////////////////////////////////
 // TextDecorTextAttr
 ////////////////////////////////////////////////////////////////////////////////
 TextAttrsMgr::TextDecorValue::
   TextDecorValue(nsIFrame* aFrame)
 {
   const nsStyleTextReset* textReset = aFrame->StyleTextReset();
   mStyle = textReset->GetDecorationStyle();
   bool isForegroundColor = false;
   textReset->GetDecorationColor(mColor, isForegroundColor);
   if (isForegroundColor)
     mColor = aFrame->StyleColor()->mColor;
   mLine = textReset->mTextDecorationLine &
     (NS_STYLE_TEXT_DECORATION_LINE_UNDERLINE |
      NS_STYLE_TEXT_DECORATION_LINE_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(Accessible* aAccessible, TextDecorValue* aValue)
 {
   nsIContent* elm = nsCoreUtils::GetDOMElementFor(aAccessible->GetContent());
   nsIFrame* frame = elm->GetPrimaryFrame();
   if (frame) {
     *aValue = TextDecorValue(frame);
     return aValue->IsDefined();
   }
   return false;
 }
 void
 TextAttrsMgr::TextDecorTextAttr::
   ExposeValue(nsIPersistentProperties* aAttributes, const TextDecorValue& aValue)
 {
   if (aValue.IsUnderline()) {
     nsAutoString formattedStyle;
     StyleInfo::FormatTextDecorationStyle(aValue.Style(), formattedStyle);
     nsAccUtils::SetAccAttr(aAttributes,
                            nsGkAtoms::textUnderlineStyle,
                            formattedStyle);
     nsAutoString formattedColor;
     StyleInfo::FormatColor(aValue.Color(), formattedColor);
     nsAccUtils::SetAccAttr(aAttributes, nsGkAtoms::textUnderlineColor,
                            formattedColor);
     return;
   }
   if (aValue.IsLineThrough()) {
     nsAutoString formattedStyle;
     StyleInfo::FormatTextDecorationStyle(aValue.Style(), formattedStyle);
     nsAccUtils::SetAccAttr(aAttributes,
                            nsGkAtoms::textLineThroughStyle,
                            formattedStyle);
     nsAutoString formattedColor;
     StyleInfo::FormatColor(aValue.Color(), formattedColor);
     nsAccUtils::SetAccAttr(aAttributes, nsGkAtoms::textLineThroughColor,
                            formattedColor);
   }
 }
 ////////////////////////////////////////////////////////////////////////////////
 // TextPosTextAttr
 ////////////////////////////////////////////////////////////////////////////////
 TextAttrsMgr::TextPosTextAttr::
   TextPosTextAttr(nsIFrame* aRootFrame, nsIFrame* aFrame) :
   TTextAttr<TextPosValue>(!aFrame)
 {
   mRootNativeValue = GetTextPosValue(aRootFrame);
   mIsRootDefined = mRootNativeValue != eTextPosNone;
   if (aFrame) {
     mNativeValue = GetTextPosValue(aFrame);
     mIsDefined = mNativeValue != eTextPosNone;
   }
 }
 bool
 TextAttrsMgr::TextPosTextAttr::
   GetValueFor(Accessible* aAccessible, TextPosValue* aValue)
 {
   nsIContent* elm = nsCoreUtils::GetDOMElementFor(aAccessible->GetContent());
   nsIFrame* frame = elm->GetPrimaryFrame();
   if (frame) {
     *aValue = GetTextPosValue(frame);
     return *aValue != eTextPosNone;
   }
   return false;
 }
 void
 TextAttrsMgr::TextPosTextAttr::
   ExposeValue(nsIPersistentProperties* aAttributes, const TextPosValue& aValue)
 {
   switch (aValue) {
     case eTextPosBaseline:
       nsAccUtils::SetAccAttr(aAttributes, nsGkAtoms::textPosition,
                              NS_LITERAL_STRING("baseline"));
       break;
     case eTextPosSub:
       nsAccUtils::SetAccAttr(aAttributes, nsGkAtoms::textPosition,
                              NS_LITERAL_STRING("sub"));
       break;
     case eTextPosSuper:
       nsAccUtils::SetAccAttr(aAttributes, nsGkAtoms::textPosition,
                              NS_LITERAL_STRING("super"));
       break;
     case eTextPosNone:
       break;
   }
 }
 TextAttrsMgr::TextPosValue
 TextAttrsMgr::TextPosTextAttr::
   GetTextPosValue(nsIFrame* aFrame) const
 {
   const nsStyleCoord& styleCoord = aFrame->StyleTextReset()->mVerticalAlign;
   switch (styleCoord.GetUnit()) {
     case eStyleUnit_Enumerated:
       switch (styleCoord.GetIntValue()) {
         case NS_STYLE_VERTICAL_ALIGN_BASELINE:
           return eTextPosBaseline;
         case NS_STYLE_VERTICAL_ALIGN_SUB:
           return eTextPosSub;
         case NS_STYLE_VERTICAL_ALIGN_SUPER:
           return eTextPosSuper;
         // No good guess for these:
         //   NS_STYLE_VERTICAL_ALIGN_TOP
         //   NS_STYLE_VERTICAL_ALIGN_TEXT_TOP
         //   NS_STYLE_VERTICAL_ALIGN_MIDDLE
         //   NS_STYLE_VERTICAL_ALIGN_TEXT_BOTTOM
         //   NS_STYLE_VERTICAL_ALIGN_BOTTOM
         //   NS_STYLE_VERTICAL_ALIGN_MIDDLE_WITH_BASELINE
         // Do not expose value of text-position attribute.
         default:
           break;
       }
       return eTextPosNone;
     case eStyleUnit_Percent:
     {
       float percentValue = styleCoord.GetPercentValue();
       return percentValue > 0 ?
         eTextPosSuper :
         (percentValue < 0 ? eTextPosSub : eTextPosBaseline);
     }
     case eStyleUnit_Coord:
     {
        nscoord coordValue = styleCoord.GetCoordValue();
        return coordValue > 0 ?
          eTextPosSuper :
          (coordValue < 0 ? eTextPosSub : eTextPosBaseline);
     }
     case eStyleUnit_Null:
     case eStyleUnit_Normal:
     case eStyleUnit_Auto:
     case eStyleUnit_None:
     case eStyleUnit_Factor:
     case eStyleUnit_Degree:
     case eStyleUnit_Grad:
     case eStyleUnit_Radian:
     case eStyleUnit_Turn:
     case eStyleUnit_FlexFraction:
     case eStyleUnit_Integer:
     case eStyleUnit_Calc:
       break;
   }
   const nsIContent* content = aFrame->GetContent();
   if (content && content->IsHTML()) {
     const nsIAtom* tagName = content->Tag();
     if (tagName == nsGkAtoms::sup)
       return eTextPosSuper;
     if (tagName == nsGkAtoms::sub)
       return eTextPosSub;
   }
   return eTextPosNone;
 }

The Tor Browser / annotate

accessible/src/base/TextAttrs.cpp@97036ab72558 (annotated)

accessible/src/base/TextAttrs.cpp