mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-12-02 10:00:54 +00:00
924 lines
28 KiB
C++
924 lines
28 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=2 et sw=2 tw=80: */
|
|
/* 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 "nsAccessiblePivot.h"
|
|
|
|
#include "HyperTextAccessible.h"
|
|
#include "nsAccUtils.h"
|
|
#include "States.h"
|
|
|
|
using namespace mozilla::a11y;
|
|
|
|
|
|
/**
|
|
* An object that stores a given traversal rule during the pivot movement.
|
|
*/
|
|
class RuleCache
|
|
{
|
|
public:
|
|
RuleCache(nsIAccessibleTraversalRule* aRule) : mRule(aRule),
|
|
mAcceptRoles(nullptr) { }
|
|
~RuleCache () {
|
|
if (mAcceptRoles)
|
|
nsMemory::Free(mAcceptRoles);
|
|
}
|
|
|
|
nsresult ApplyFilter(Accessible* aAccessible, uint16_t* aResult);
|
|
|
|
private:
|
|
nsCOMPtr<nsIAccessibleTraversalRule> mRule;
|
|
uint32_t* mAcceptRoles;
|
|
uint32_t mAcceptRolesLength;
|
|
uint32_t mPreFilter;
|
|
};
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// nsAccessiblePivot
|
|
|
|
nsAccessiblePivot::nsAccessiblePivot(Accessible* aRoot) :
|
|
mRoot(aRoot), mModalRoot(nullptr), mPosition(nullptr),
|
|
mStartOffset(-1), mEndOffset(-1)
|
|
{
|
|
NS_ASSERTION(aRoot, "A root accessible is required");
|
|
}
|
|
|
|
nsAccessiblePivot::~nsAccessiblePivot()
|
|
{
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// nsISupports
|
|
|
|
NS_IMPL_CYCLE_COLLECTION(nsAccessiblePivot, mRoot, mPosition, mObservers)
|
|
|
|
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsAccessiblePivot)
|
|
NS_INTERFACE_MAP_ENTRY(nsIAccessiblePivot)
|
|
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIAccessiblePivot)
|
|
NS_INTERFACE_MAP_END
|
|
|
|
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsAccessiblePivot)
|
|
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsAccessiblePivot)
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// nsIAccessiblePivot
|
|
|
|
NS_IMETHODIMP
|
|
nsAccessiblePivot::GetRoot(nsIAccessible** aRoot)
|
|
{
|
|
NS_ENSURE_ARG_POINTER(aRoot);
|
|
|
|
NS_IF_ADDREF(*aRoot = mRoot);
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsAccessiblePivot::GetPosition(nsIAccessible** aPosition)
|
|
{
|
|
NS_ENSURE_ARG_POINTER(aPosition);
|
|
|
|
NS_IF_ADDREF(*aPosition = mPosition);
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsAccessiblePivot::SetPosition(nsIAccessible* aPosition)
|
|
{
|
|
nsRefPtr<Accessible> secondPosition;
|
|
|
|
if (aPosition) {
|
|
secondPosition = do_QueryObject(aPosition);
|
|
if (!secondPosition || !IsDescendantOf(secondPosition, GetActiveRoot()))
|
|
return NS_ERROR_INVALID_ARG;
|
|
}
|
|
|
|
// Swap old position with new position, saves us an AddRef/Release.
|
|
mPosition.swap(secondPosition);
|
|
int32_t oldStart = mStartOffset, oldEnd = mEndOffset;
|
|
mStartOffset = mEndOffset = -1;
|
|
NotifyOfPivotChange(secondPosition, oldStart, oldEnd,
|
|
nsIAccessiblePivot::REASON_NONE, false);
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsAccessiblePivot::GetModalRoot(nsIAccessible** aModalRoot)
|
|
{
|
|
NS_ENSURE_ARG_POINTER(aModalRoot);
|
|
|
|
NS_IF_ADDREF(*aModalRoot = mModalRoot);
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsAccessiblePivot::SetModalRoot(nsIAccessible* aModalRoot)
|
|
{
|
|
nsRefPtr<Accessible> modalRoot;
|
|
|
|
if (aModalRoot) {
|
|
modalRoot = do_QueryObject(aModalRoot);
|
|
if (!modalRoot || !IsDescendantOf(modalRoot, mRoot))
|
|
return NS_ERROR_INVALID_ARG;
|
|
}
|
|
|
|
mModalRoot.swap(modalRoot);
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsAccessiblePivot::GetStartOffset(int32_t* aStartOffset)
|
|
{
|
|
NS_ENSURE_ARG_POINTER(aStartOffset);
|
|
|
|
*aStartOffset = mStartOffset;
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsAccessiblePivot::GetEndOffset(int32_t* aEndOffset)
|
|
{
|
|
NS_ENSURE_ARG_POINTER(aEndOffset);
|
|
|
|
*aEndOffset = mEndOffset;
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsAccessiblePivot::SetTextRange(nsIAccessibleText* aTextAccessible,
|
|
int32_t aStartOffset, int32_t aEndOffset,
|
|
bool aIsFromUserInput, uint8_t aArgc)
|
|
{
|
|
NS_ENSURE_ARG(aTextAccessible);
|
|
|
|
// Check that start offset is smaller than end offset, and that if a value is
|
|
// smaller than 0, both should be -1.
|
|
NS_ENSURE_TRUE(aStartOffset <= aEndOffset &&
|
|
(aStartOffset >= 0 || (aStartOffset != -1 && aEndOffset != -1)),
|
|
NS_ERROR_INVALID_ARG);
|
|
|
|
nsRefPtr<Accessible> acc(do_QueryObject(aTextAccessible));
|
|
if (!acc)
|
|
return NS_ERROR_INVALID_ARG;
|
|
|
|
HyperTextAccessible* newPosition = acc->AsHyperText();
|
|
if (!newPosition || !IsDescendantOf(newPosition, GetActiveRoot()))
|
|
return NS_ERROR_INVALID_ARG;
|
|
|
|
// Make sure the given offsets don't exceed the character count.
|
|
int32_t charCount = newPosition->CharacterCount();
|
|
|
|
if (aEndOffset > charCount)
|
|
return NS_ERROR_FAILURE;
|
|
|
|
int32_t oldStart = mStartOffset, oldEnd = mEndOffset;
|
|
mStartOffset = aStartOffset;
|
|
mEndOffset = aEndOffset;
|
|
|
|
nsRefPtr<Accessible> oldPosition = mPosition.forget();
|
|
mPosition = newPosition;
|
|
|
|
NotifyOfPivotChange(oldPosition, oldStart, oldEnd,
|
|
nsIAccessiblePivot::REASON_TEXT,
|
|
(aArgc > 0) ? aIsFromUserInput : true);
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
// Traversal functions
|
|
|
|
NS_IMETHODIMP
|
|
nsAccessiblePivot::MoveNext(nsIAccessibleTraversalRule* aRule,
|
|
nsIAccessible* aAnchor, bool aIncludeStart,
|
|
bool aIsFromUserInput, uint8_t aArgc, bool* aResult)
|
|
{
|
|
NS_ENSURE_ARG(aResult);
|
|
NS_ENSURE_ARG(aRule);
|
|
|
|
*aResult = false;
|
|
|
|
Accessible* root = GetActiveRoot();
|
|
nsRefPtr<Accessible> anchor =
|
|
(aArgc > 0) ? do_QueryObject(aAnchor) : mPosition;
|
|
if (anchor && (anchor->IsDefunct() || !IsDescendantOf(anchor, root)))
|
|
return NS_ERROR_NOT_IN_TREE;
|
|
|
|
nsresult rv = NS_OK;
|
|
Accessible* accessible =
|
|
SearchForward(anchor, aRule, (aArgc > 1) ? aIncludeStart : false, &rv);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
if (accessible)
|
|
*aResult = MovePivotInternal(accessible, nsIAccessiblePivot::REASON_NEXT,
|
|
(aArgc > 2) ? aIsFromUserInput : true);
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsAccessiblePivot::MovePrevious(nsIAccessibleTraversalRule* aRule,
|
|
nsIAccessible* aAnchor,
|
|
bool aIncludeStart, bool aIsFromUserInput,
|
|
uint8_t aArgc, bool* aResult)
|
|
{
|
|
NS_ENSURE_ARG(aResult);
|
|
NS_ENSURE_ARG(aRule);
|
|
|
|
*aResult = false;
|
|
|
|
Accessible* root = GetActiveRoot();
|
|
nsRefPtr<Accessible> anchor =
|
|
(aArgc > 0) ? do_QueryObject(aAnchor) : mPosition;
|
|
if (anchor && (anchor->IsDefunct() || !IsDescendantOf(anchor, root)))
|
|
return NS_ERROR_NOT_IN_TREE;
|
|
|
|
nsresult rv = NS_OK;
|
|
Accessible* accessible =
|
|
SearchBackward(anchor, aRule, (aArgc > 1) ? aIncludeStart : false, &rv);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
if (accessible)
|
|
*aResult = MovePivotInternal(accessible, nsIAccessiblePivot::REASON_PREV,
|
|
(aArgc > 2) ? aIsFromUserInput : true);
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsAccessiblePivot::MoveFirst(nsIAccessibleTraversalRule* aRule,
|
|
bool aIsFromUserInput,
|
|
uint8_t aArgc, bool* aResult)
|
|
{
|
|
NS_ENSURE_ARG(aResult);
|
|
NS_ENSURE_ARG(aRule);
|
|
|
|
Accessible* root = GetActiveRoot();
|
|
NS_ENSURE_TRUE(root && !root->IsDefunct(), NS_ERROR_NOT_IN_TREE);
|
|
|
|
nsresult rv = NS_OK;
|
|
Accessible* accessible = SearchForward(root, aRule, true, &rv);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
if (accessible)
|
|
*aResult = MovePivotInternal(accessible, nsIAccessiblePivot::REASON_FIRST,
|
|
(aArgc > 0) ? aIsFromUserInput : true);
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsAccessiblePivot::MoveLast(nsIAccessibleTraversalRule* aRule,
|
|
bool aIsFromUserInput,
|
|
uint8_t aArgc, bool* aResult)
|
|
{
|
|
NS_ENSURE_ARG(aResult);
|
|
NS_ENSURE_ARG(aRule);
|
|
|
|
Accessible* root = GetActiveRoot();
|
|
NS_ENSURE_TRUE(root && !root->IsDefunct(), NS_ERROR_NOT_IN_TREE);
|
|
|
|
*aResult = false;
|
|
nsresult rv = NS_OK;
|
|
Accessible* lastAccessible = root;
|
|
Accessible* accessible = nullptr;
|
|
|
|
// First go to the last accessible in pre-order
|
|
while (lastAccessible->HasChildren())
|
|
lastAccessible = lastAccessible->LastChild();
|
|
|
|
// Search backwards from last accessible and find the last occurrence in the doc
|
|
accessible = SearchBackward(lastAccessible, aRule, true, &rv);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
if (accessible)
|
|
*aResult = MovePivotInternal(accessible, nsAccessiblePivot::REASON_LAST,
|
|
(aArgc > 0) ? aIsFromUserInput : true);
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsAccessiblePivot::MoveNextByText(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 = nullptr;
|
|
// Find the nearest text node using a preorder traversal starting from
|
|
// the current node.
|
|
if (!(text = tempPosition->AsHyperText())) {
|
|
text = SearchForText(tempPosition, false);
|
|
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 (tempEnd == -1)
|
|
tempEnd = text == curPosition->Parent() ?
|
|
text->GetChildOffset(curPosition) : 0;
|
|
|
|
// If there's no more text on the current node, try to find the next text
|
|
// node; if there isn't one, bail out.
|
|
if (tempEnd == static_cast<int32_t>(text->CharacterCount())) {
|
|
if (tempPosition == root)
|
|
return NS_OK;
|
|
|
|
// If we're currently sitting on a link, try move to either the next
|
|
// 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->NextSibling();
|
|
if (tempPosition->IsLink()) {
|
|
if (sibling && sibling->IsLink()) {
|
|
tempStart = tempEnd = -1;
|
|
tempPosition = sibling;
|
|
} else {
|
|
tempStart = tempPosition->StartOffset();
|
|
tempEnd = tempPosition->EndOffset();
|
|
tempPosition = tempPosition->Parent();
|
|
}
|
|
} else {
|
|
tempPosition = SearchForText(tempPosition, false);
|
|
if (!tempPosition)
|
|
return NS_OK;
|
|
tempStart = tempEnd = -1;
|
|
}
|
|
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, currentEnd = tempEnd;
|
|
text->TextAtOffset(tempEnd, endBoundary, &newStart, &tempEnd, unusedText);
|
|
text->TextBeforeOffset(tempEnd, startBoundary, &newStart, &newEnd, unusedText);
|
|
int32_t potentialStart = newEnd == tempEnd ? newStart : newEnd;
|
|
tempStart = potentialStart > tempStart ? potentialStart : currentEnd;
|
|
|
|
// The offset range we've obtained might have embedded characters in it,
|
|
// limit the range to the start of the first occurrence of an embedded
|
|
// character.
|
|
Accessible* childAtOffset = nullptr;
|
|
for (int32_t i = tempStart; i < tempEnd; i++) {
|
|
childAtOffset = text->GetChildAtOffset(i);
|
|
if (childAtOffset && nsAccUtils::IsEmbeddedObject(childAtOffset)) {
|
|
tempEnd = i;
|
|
break;
|
|
}
|
|
}
|
|
// If there's an embedded character at the very start of the range, we
|
|
// instead want to traverse into it. So restart the movement with
|
|
// the child as the starting point.
|
|
if (childAtOffset && nsAccUtils::IsEmbeddedObject(childAtOffset) &&
|
|
tempStart == static_cast<int32_t>(childAtOffset->StartOffset())) {
|
|
tempPosition = childAtOffset;
|
|
tempStart = tempEnd = -1;
|
|
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;
|
|
}
|
|
}
|
|
|
|
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 && nsAccUtils::IsEmbeddedObject(childAtOffset)) {
|
|
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 && nsAccUtils::IsEmbeddedObject(childAtOffset) &&
|
|
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;
|
|
}
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsAccessiblePivot::MoveToPoint(nsIAccessibleTraversalRule* aRule,
|
|
int32_t aX, int32_t aY, bool aIgnoreNoMatch,
|
|
bool aIsFromUserInput, uint8_t aArgc,
|
|
bool* aResult)
|
|
{
|
|
NS_ENSURE_ARG_POINTER(aResult);
|
|
NS_ENSURE_ARG_POINTER(aRule);
|
|
|
|
*aResult = false;
|
|
|
|
Accessible* root = GetActiveRoot();
|
|
NS_ENSURE_TRUE(root && !root->IsDefunct(), NS_ERROR_NOT_IN_TREE);
|
|
|
|
RuleCache cache(aRule);
|
|
Accessible* match = nullptr;
|
|
Accessible* child = root->ChildAtPoint(aX, aY, Accessible::eDeepestChild);
|
|
while (child && root != child) {
|
|
uint16_t filtered = nsIAccessibleTraversalRule::FILTER_IGNORE;
|
|
nsresult rv = cache.ApplyFilter(child, &filtered);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
// Ignore any matching nodes that were below this one
|
|
if (filtered & nsIAccessibleTraversalRule::FILTER_IGNORE_SUBTREE)
|
|
match = nullptr;
|
|
|
|
// Match if no node below this is a match
|
|
if ((filtered & nsIAccessibleTraversalRule::FILTER_MATCH) && !match) {
|
|
int32_t childX, childY, childWidth, childHeight;
|
|
child->GetBounds(&childX, &childY, &childWidth, &childHeight);
|
|
// Double-check child's bounds since the deepest child may have been out
|
|
// of bounds. This assures we don't return a false positive.
|
|
if (aX >= childX && aX < childX + childWidth &&
|
|
aY >= childY && aY < childY + childHeight)
|
|
match = child;
|
|
}
|
|
|
|
child = child->Parent();
|
|
}
|
|
|
|
if (match || !aIgnoreNoMatch)
|
|
*aResult = MovePivotInternal(match, nsIAccessiblePivot::REASON_POINT,
|
|
(aArgc > 0) ? aIsFromUserInput : true);
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
// Observer functions
|
|
|
|
NS_IMETHODIMP
|
|
nsAccessiblePivot::AddObserver(nsIAccessiblePivotObserver* aObserver)
|
|
{
|
|
NS_ENSURE_ARG(aObserver);
|
|
|
|
mObservers.AppendElement(aObserver);
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsAccessiblePivot::RemoveObserver(nsIAccessiblePivotObserver* aObserver)
|
|
{
|
|
NS_ENSURE_ARG(aObserver);
|
|
|
|
return mObservers.RemoveElement(aObserver) ? NS_OK : NS_ERROR_FAILURE;
|
|
}
|
|
|
|
// Private utility methods
|
|
|
|
bool
|
|
nsAccessiblePivot::IsDescendantOf(Accessible* aAccessible, Accessible* aAncestor)
|
|
{
|
|
if (!aAncestor || aAncestor->IsDefunct())
|
|
return false;
|
|
|
|
// XXX Optimize with IsInDocument() when appropriate. Blocked by bug 759875.
|
|
Accessible* accessible = aAccessible;
|
|
do {
|
|
if (accessible == aAncestor)
|
|
return true;
|
|
} while ((accessible = accessible->Parent()));
|
|
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
nsAccessiblePivot::MovePivotInternal(Accessible* aPosition,
|
|
PivotMoveReason aReason,
|
|
bool aIsFromUserInput)
|
|
{
|
|
nsRefPtr<Accessible> oldPosition = mPosition.forget();
|
|
mPosition = aPosition;
|
|
int32_t oldStart = mStartOffset, oldEnd = mEndOffset;
|
|
mStartOffset = mEndOffset = -1;
|
|
|
|
return NotifyOfPivotChange(oldPosition, oldStart, oldEnd, aReason,
|
|
aIsFromUserInput);
|
|
}
|
|
|
|
Accessible*
|
|
nsAccessiblePivot::AdjustStartPosition(Accessible* aAccessible,
|
|
RuleCache& aCache,
|
|
uint16_t* aFilterResult,
|
|
nsresult* aResult)
|
|
{
|
|
Accessible* matched = aAccessible;
|
|
*aResult = aCache.ApplyFilter(aAccessible, aFilterResult);
|
|
|
|
if (aAccessible != mRoot && aAccessible != mModalRoot) {
|
|
for (Accessible* temp = aAccessible->Parent();
|
|
temp && temp != mRoot && temp != mModalRoot; temp = temp->Parent()) {
|
|
uint16_t filtered = nsIAccessibleTraversalRule::FILTER_IGNORE;
|
|
*aResult = aCache.ApplyFilter(temp, &filtered);
|
|
NS_ENSURE_SUCCESS(*aResult, nullptr);
|
|
if (filtered & nsIAccessibleTraversalRule::FILTER_IGNORE_SUBTREE) {
|
|
*aFilterResult = filtered;
|
|
matched = temp;
|
|
}
|
|
}
|
|
}
|
|
|
|
return matched;
|
|
}
|
|
|
|
Accessible*
|
|
nsAccessiblePivot::SearchBackward(Accessible* aAccessible,
|
|
nsIAccessibleTraversalRule* aRule,
|
|
bool aSearchCurrent,
|
|
nsresult* aResult)
|
|
{
|
|
*aResult = NS_OK;
|
|
|
|
// Initial position could be unset, in that case return null.
|
|
if (!aAccessible)
|
|
return nullptr;
|
|
|
|
RuleCache cache(aRule);
|
|
uint16_t filtered = nsIAccessibleTraversalRule::FILTER_IGNORE;
|
|
Accessible* accessible = AdjustStartPosition(aAccessible, cache,
|
|
&filtered, aResult);
|
|
NS_ENSURE_SUCCESS(*aResult, nullptr);
|
|
|
|
if (aSearchCurrent && (filtered & nsIAccessibleTraversalRule::FILTER_MATCH)) {
|
|
return accessible;
|
|
}
|
|
|
|
Accessible* root = GetActiveRoot();
|
|
while (accessible != root) {
|
|
Accessible* parent = accessible->Parent();
|
|
int32_t idxInParent = accessible->IndexInParent();
|
|
while (idxInParent > 0) {
|
|
if (!(accessible = parent->GetChildAt(--idxInParent)))
|
|
continue;
|
|
|
|
*aResult = cache.ApplyFilter(accessible, &filtered);
|
|
NS_ENSURE_SUCCESS(*aResult, nullptr);
|
|
|
|
Accessible* lastChild = nullptr;
|
|
while (!(filtered & nsIAccessibleTraversalRule::FILTER_IGNORE_SUBTREE) &&
|
|
(lastChild = accessible->LastChild())) {
|
|
parent = accessible;
|
|
accessible = lastChild;
|
|
idxInParent = accessible->IndexInParent();
|
|
*aResult = cache.ApplyFilter(accessible, &filtered);
|
|
NS_ENSURE_SUCCESS(*aResult, nullptr);
|
|
}
|
|
|
|
if (filtered & nsIAccessibleTraversalRule::FILTER_MATCH)
|
|
return accessible;
|
|
}
|
|
|
|
if (!(accessible = parent))
|
|
break;
|
|
|
|
*aResult = cache.ApplyFilter(accessible, &filtered);
|
|
NS_ENSURE_SUCCESS(*aResult, nullptr);
|
|
|
|
if (filtered & nsIAccessibleTraversalRule::FILTER_MATCH)
|
|
return accessible;
|
|
}
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
Accessible*
|
|
nsAccessiblePivot::SearchForward(Accessible* aAccessible,
|
|
nsIAccessibleTraversalRule* aRule,
|
|
bool aSearchCurrent,
|
|
nsresult* aResult)
|
|
{
|
|
*aResult = NS_OK;
|
|
|
|
// Initial position could be not set, in that case begin search from root.
|
|
Accessible* root = GetActiveRoot();
|
|
Accessible* accessible = (!aAccessible) ? root : aAccessible;
|
|
|
|
RuleCache cache(aRule);
|
|
|
|
uint16_t filtered = nsIAccessibleTraversalRule::FILTER_IGNORE;
|
|
accessible = AdjustStartPosition(accessible, cache, &filtered, aResult);
|
|
NS_ENSURE_SUCCESS(*aResult, nullptr);
|
|
if (aSearchCurrent && (filtered & nsIAccessibleTraversalRule::FILTER_MATCH))
|
|
return accessible;
|
|
|
|
while (true) {
|
|
Accessible* firstChild = nullptr;
|
|
while (!(filtered & nsIAccessibleTraversalRule::FILTER_IGNORE_SUBTREE) &&
|
|
(firstChild = accessible->FirstChild())) {
|
|
accessible = firstChild;
|
|
*aResult = cache.ApplyFilter(accessible, &filtered);
|
|
NS_ENSURE_SUCCESS(*aResult, nullptr);
|
|
|
|
if (filtered & nsIAccessibleTraversalRule::FILTER_MATCH)
|
|
return accessible;
|
|
}
|
|
|
|
Accessible* sibling = nullptr;
|
|
Accessible* temp = accessible;
|
|
do {
|
|
if (temp == root)
|
|
break;
|
|
|
|
sibling = temp->NextSibling();
|
|
|
|
if (sibling)
|
|
break;
|
|
} while ((temp = temp->Parent()));
|
|
|
|
if (!sibling)
|
|
break;
|
|
|
|
accessible = sibling;
|
|
*aResult = cache.ApplyFilter(accessible, &filtered);
|
|
NS_ENSURE_SUCCESS(*aResult, nullptr);
|
|
|
|
if (filtered & nsIAccessibleTraversalRule::FILTER_MATCH)
|
|
return accessible;
|
|
}
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
HyperTextAccessible*
|
|
nsAccessiblePivot::SearchForText(Accessible* aAccessible, bool aBackward)
|
|
{
|
|
Accessible* root = GetActiveRoot();
|
|
Accessible* accessible = aAccessible;
|
|
while (true) {
|
|
Accessible* child = nullptr;
|
|
|
|
while ((child = (aBackward ? accessible->LastChild() :
|
|
accessible->FirstChild()))) {
|
|
accessible = child;
|
|
if (child->IsHyperText())
|
|
return child->AsHyperText();
|
|
}
|
|
|
|
Accessible* sibling = nullptr;
|
|
Accessible* temp = accessible;
|
|
do {
|
|
if (temp == root)
|
|
break;
|
|
|
|
if (temp != aAccessible && temp->IsHyperText())
|
|
return temp->AsHyperText();
|
|
|
|
sibling = aBackward ? temp->PrevSibling() : temp->NextSibling();
|
|
|
|
if (sibling)
|
|
break;
|
|
} while ((temp = temp->Parent()));
|
|
|
|
if (!sibling)
|
|
break;
|
|
|
|
accessible = sibling;
|
|
if (accessible->IsHyperText())
|
|
return accessible->AsHyperText();
|
|
}
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
|
|
bool
|
|
nsAccessiblePivot::NotifyOfPivotChange(Accessible* aOldPosition,
|
|
int32_t aOldStart, int32_t aOldEnd,
|
|
int16_t aReason, bool aIsFromUserInput)
|
|
{
|
|
if (aOldPosition == mPosition &&
|
|
aOldStart == mStartOffset && aOldEnd == mEndOffset)
|
|
return false;
|
|
|
|
nsTObserverArray<nsCOMPtr<nsIAccessiblePivotObserver> >::ForwardIterator iter(mObservers);
|
|
while (iter.HasMore()) {
|
|
nsIAccessiblePivotObserver* obs = iter.GetNext();
|
|
obs->OnPivotChanged(this, aOldPosition, aOldStart, aOldEnd, aReason,
|
|
aIsFromUserInput);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
nsresult
|
|
RuleCache::ApplyFilter(Accessible* aAccessible, uint16_t* aResult)
|
|
{
|
|
*aResult = nsIAccessibleTraversalRule::FILTER_IGNORE;
|
|
|
|
if (!mAcceptRoles) {
|
|
nsresult rv = mRule->GetMatchRoles(&mAcceptRoles, &mAcceptRolesLength);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
rv = mRule->GetPreFilter(&mPreFilter);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
}
|
|
|
|
if (mPreFilter) {
|
|
uint64_t state = aAccessible->State();
|
|
|
|
if ((nsIAccessibleTraversalRule::PREFILTER_INVISIBLE & mPreFilter) &&
|
|
(state & states::INVISIBLE))
|
|
return NS_OK;
|
|
|
|
if ((nsIAccessibleTraversalRule::PREFILTER_OFFSCREEN & mPreFilter) &&
|
|
(state & states::OFFSCREEN))
|
|
return NS_OK;
|
|
|
|
if ((nsIAccessibleTraversalRule::PREFILTER_NOT_FOCUSABLE & mPreFilter) &&
|
|
!(state & states::FOCUSABLE))
|
|
return NS_OK;
|
|
|
|
if (nsIAccessibleTraversalRule::PREFILTER_ARIA_HIDDEN & mPreFilter) {
|
|
nsIContent* content = aAccessible->GetContent();
|
|
if (content &&
|
|
nsAccUtils::HasDefinedARIAToken(content, nsGkAtoms::aria_hidden) &&
|
|
!content->AttrValueIs(kNameSpaceID_None, nsGkAtoms::aria_hidden,
|
|
nsGkAtoms::_false, eCaseMatters)) {
|
|
*aResult |= nsIAccessibleTraversalRule::FILTER_IGNORE_SUBTREE;
|
|
return NS_OK;
|
|
}
|
|
}
|
|
|
|
if ((nsIAccessibleTraversalRule::PREFILTER_TRANSPARENT & mPreFilter) &&
|
|
!(state & states::OPAQUE1)) {
|
|
nsIFrame* frame = aAccessible->GetFrame();
|
|
if (frame->StyleDisplay()->mOpacity == 0.0f) {
|
|
*aResult |= nsIAccessibleTraversalRule::FILTER_IGNORE_SUBTREE;
|
|
return NS_OK;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (mAcceptRolesLength > 0) {
|
|
uint32_t accessibleRole = aAccessible->Role();
|
|
bool matchesRole = false;
|
|
for (uint32_t idx = 0; idx < mAcceptRolesLength; idx++) {
|
|
matchesRole = mAcceptRoles[idx] == accessibleRole;
|
|
if (matchesRole)
|
|
break;
|
|
}
|
|
if (!matchesRole)
|
|
return NS_OK;
|
|
}
|
|
|
|
return mRule->Match(aAccessible, aResult);
|
|
}
|