bool
nsAccUtils::IsTextInterfaceSupportCorrect(Accessible* aAccessible)
{
// Don't test for accessible docs, it makes us create accessibles too
// early and fire mutation events before we need to
if (aAccessible->IsDoc())
return true;
bool foundText = false;
uint32_t childCount = aAccessible->ChildCount();
for (uint32_t childIdx = 0; childIdx < childCount; childIdx++) {
Accessible* child = aAccessible->GetChildAt(childIdx);
if (child->IsText()) {
foundText = true;
break;
}
}
return !foundText || aAccessible->IsHyperText();
}
void
TextAttrsMgr::GetAttributes(nsIPersistentProperties* aAttributes,
uint32_t* aStartOffset,
uint32_t* aEndOffset)
{
// 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 &&
aStartOffset && aEndOffset) ||
(!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()) {
for (int32_t childIdx = mOffsetAccIdx - 1; childIdx >= 0; childIdx--) {
Accessible* currAcc = mHyperTextAcc->GetChildAt(childIdx);
if (currAcc->IsText())
break;
(*aStartOffset)--;
}
uint32_t childCount = mHyperTextAcc->ChildCount();
for (uint32_t childIdx = mOffsetAccIdx + 1; childIdx < childCount;
childIdx++) {
Accessible* currAcc = mHyperTextAcc->GetChildAt(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();
MOZ_ASSERT(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);
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);
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), aStartOffset, aEndOffset);
}
NS_IMETHODIMP
nsAccessiblePivot::MovePreviousByText(TextBoundaryType aBoundary,
bool aIsFromUserInput, uint8_t aArgc,
bool* aResult)
{
NS_ENSURE_ARG(aResult);
*aResult = false;
int32_t tempStart = mStartOffset, tempEnd = mEndOffset;
Accessible* tempPosition = mPosition;
Accessible* root = GetActiveRoot();
while (true) {
Accessible* curPosition = tempPosition;
HyperTextAccessible* text;
// Find the nearest text node using a reverse preorder traversal starting
// from the current node.
if (!(text = tempPosition->AsHyperText())) {
text = SearchForText(tempPosition, true);
if (!text)
return NS_OK;
if (text != curPosition)
tempStart = tempEnd = -1;
tempPosition = text;
}
// If the search led to the parent of the node we started on (e.g. when
// starting on a text leaf), start the text movement from the end of that
// node, otherwise we just default to 0.
if (tempStart == -1) {
if (tempPosition != curPosition)
tempStart = text == curPosition->Parent() ?
text->GetChildOffset(curPosition) : text->CharacterCount();
else
tempStart = 0;
}
// If there's no more text on the current node, try to find the previous
// text node; if there isn't one, bail out.
if (tempStart == 0) {
if (tempPosition == root)
return NS_OK;
// If we're currently sitting on a link, try move to either the previous
// sibling or the parent, whichever is closer to the current end
// offset. Otherwise, do a forward search for the next node to land on
// (we don't do this in the first case because we don't want to go to the
// subtree).
Accessible* sibling = tempPosition->PrevSibling();
if (tempPosition->IsLink()) {
if (sibling && sibling->IsLink()) {
HyperTextAccessible* siblingText = sibling->AsHyperText();
tempStart = tempEnd = siblingText ?
siblingText->CharacterCount() : -1;
tempPosition = sibling;
} else {
tempStart = tempPosition->StartOffset();
tempEnd = tempPosition->EndOffset();
tempPosition = tempPosition->Parent();
}
} else {
HyperTextAccessible* tempText = SearchForText(tempPosition, true);
if (!tempText)
return NS_OK;
tempPosition = tempText;
tempStart = tempEnd = tempText->CharacterCount();
}
continue;
}
AccessibleTextBoundary startBoundary, endBoundary;
switch (aBoundary) {
case CHAR_BOUNDARY:
startBoundary = nsIAccessibleText::BOUNDARY_CHAR;
endBoundary = nsIAccessibleText::BOUNDARY_CHAR;
break;
case WORD_BOUNDARY:
startBoundary = nsIAccessibleText::BOUNDARY_WORD_START;
endBoundary = nsIAccessibleText::BOUNDARY_WORD_END;
break;
default:
return NS_ERROR_INVALID_ARG;
}
nsAutoString unusedText;
int32_t newStart = 0, newEnd = 0, currentStart = tempStart, potentialEnd = 0;
text->TextBeforeOffset(tempStart, startBoundary, &newStart, &newEnd, unusedText);
if (newStart < tempStart)
tempStart = newEnd >= currentStart ? newStart : newEnd;
else // XXX: In certain odd cases newStart is equal to tempStart
text->TextBeforeOffset(tempStart - 1, startBoundary, &newStart,
&tempStart, unusedText);
text->TextAtOffset(tempStart, endBoundary, &newStart, &potentialEnd,
unusedText);
tempEnd = potentialEnd < tempEnd ? potentialEnd : currentStart;
// The offset range we've obtained might have embedded characters in it,
// limit the range to the start of the last occurrence of an embedded
// character.
Accessible* childAtOffset = nullptr;
for (int32_t i = tempEnd - 1; i >= tempStart; i--) {
childAtOffset = text->GetChildAtOffset(i);
if (childAtOffset && !childAtOffset->IsText()) {
tempStart = childAtOffset->EndOffset();
break;
}
}
// If there's an embedded character at the very end of the range, we
// instead want to traverse into it. So restart the movement with
// the child as the starting point.
if (childAtOffset && !childAtOffset->IsText() &&
tempEnd == static_cast<int32_t>(childAtOffset->EndOffset())) {
tempPosition = childAtOffset;
tempStart = tempEnd = childAtOffset->AsHyperText()->CharacterCount();
continue;
}
*aResult = true;
Accessible* startPosition = mPosition;
int32_t oldStart = mStartOffset, oldEnd = mEndOffset;
mPosition = tempPosition;
mStartOffset = tempStart;
mEndOffset = tempEnd;
NotifyOfPivotChange(startPosition, oldStart, oldEnd,
nsIAccessiblePivot::REASON_TEXT,
(aArgc > 0) ? aIsFromUserInput : true);
return NS_OK;
}
}