gecko-dev/accessible/base/TextRange.cpp

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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 "TextRange-inl.h"
#include "Accessible-inl.h"
#include "nsAccUtils.h"
namespace mozilla {
namespace a11y {
////////////////////////////////////////////////////////////////////////////////
// TextPoint
bool
TextPoint::operator <(const TextPoint& aPoint) const
{
if (mContainer == aPoint.mContainer)
return mOffset < aPoint.mOffset;
// Build the chain of parents
Accessible* p1 = mContainer;
Accessible* p2 = aPoint.mContainer;
AutoTArray<Accessible*, 30> parents1, parents2;
do {
parents1.AppendElement(p1);
p1 = p1->Parent();
} while (p1);
do {
parents2.AppendElement(p2);
p2 = p2->Parent();
} while (p2);
// Find where the parent chain differs
uint32_t pos1 = parents1.Length(), pos2 = parents2.Length();
for (uint32_t len = std::min(pos1, pos2); len > 0; --len) {
Accessible* child1 = parents1.ElementAt(--pos1);
Accessible* child2 = parents2.ElementAt(--pos2);
if (child1 != child2)
return child1->IndexInParent() < child2->IndexInParent();
}
NS_ERROR("Broken tree?!");
return false;
}
////////////////////////////////////////////////////////////////////////////////
// TextRange
TextRange::TextRange(HyperTextAccessible* aRoot,
HyperTextAccessible* aStartContainer, int32_t aStartOffset,
HyperTextAccessible* aEndContainer, int32_t aEndOffset) :
mRoot(aRoot), mStartContainer(aStartContainer), mEndContainer(aEndContainer),
mStartOffset(aStartOffset), mEndOffset(aEndOffset)
{
}
void
TextRange::EmbeddedChildren(nsTArray<Accessible*>* aChildren) const
{
if (mStartContainer == mEndContainer) {
int32_t startIdx = mStartContainer->GetChildIndexAtOffset(mStartOffset);
int32_t endIdx = mStartContainer->GetChildIndexAtOffset(mEndOffset);
for (int32_t idx = startIdx; idx <= endIdx; idx++) {
Accessible* child = mStartContainer->GetChildAt(idx);
if (nsAccUtils::IsEmbeddedObject(child))
aChildren->AppendElement(child);
}
return;
}
Accessible* p1 = mStartContainer->GetChildAtOffset(mStartOffset);
Accessible* p2 = mEndContainer->GetChildAtOffset(mEndOffset);
uint32_t pos1 = 0, pos2 = 0;
AutoTArray<Accessible*, 30> parents1, parents2;
Accessible* container =
CommonParent(p1, p2, &parents1, &pos1, &parents2, &pos2);
// Traverse the tree up to the container and collect embedded objects.
for (uint32_t idx = 0; idx < pos1 - 1; idx++) {
Accessible* parent = parents1[idx + 1];
Accessible* child = parents1[idx];
uint32_t childCount = parent->ChildCount();
for (uint32_t childIdx = child->IndexInParent(); childIdx < childCount; childIdx++) {
Accessible* next = parent->GetChildAt(childIdx);
if (nsAccUtils::IsEmbeddedObject(next))
aChildren->AppendElement(next);
}
}
// Traverse through direct children in the container.
int32_t endIdx = parents2[pos2 - 1]->IndexInParent();
int32_t childIdx = parents1[pos1 - 1]->IndexInParent() + 1;
for (; childIdx < endIdx; childIdx++) {
Accessible* next = container->GetChildAt(childIdx);
if (nsAccUtils::IsEmbeddedObject(next))
aChildren->AppendElement(next);
}
// Traverse down from the container to end point.
for (int32_t idx = pos2 - 2; idx > 0; idx--) {
Accessible* parent = parents2[idx];
Accessible* child = parents2[idx - 1];
int32_t endIdx = child->IndexInParent();
for (int32_t childIdx = 0; childIdx < endIdx; childIdx++) {
Accessible* next = parent->GetChildAt(childIdx);
if (nsAccUtils::IsEmbeddedObject(next))
aChildren->AppendElement(next);
}
}
}
void
TextRange::Text(nsAString& aText) const
{
Accessible* current = mStartContainer->GetChildAtOffset(mStartOffset);
uint32_t startIntlOffset =
mStartOffset - mStartContainer->GetChildOffset(current);
while (current && TextInternal(aText, current, startIntlOffset)) {
current = current->Parent();
if (!current)
break;
current = current->NextSibling();
}
}
void
TextRange::Bounds(nsTArray<nsIntRect> aRects) const
{
}
void
TextRange::Normalize(ETextUnit aUnit)
{
}
bool
TextRange::Crop(Accessible* aContainer)
{
uint32_t boundaryPos = 0, containerPos = 0;
AutoTArray<Accessible*, 30> boundaryParents, containerParents;
// Crop the start boundary.
Accessible* container = nullptr;
Accessible* boundary = mStartContainer->GetChildAtOffset(mStartOffset);
if (boundary != aContainer) {
CommonParent(boundary, aContainer, &boundaryParents, &boundaryPos,
&containerParents, &containerPos);
if (boundaryPos == 0) {
if (containerPos != 0) {
// The container is contained by the start boundary, reduce the range to
// the point starting at the container.
aContainer->ToTextPoint(mStartContainer.StartAssignment(), &mStartOffset);
static_cast<Accessible*>(mStartContainer)->AddRef();
}
else {
// The start boundary and the container are siblings.
container = aContainer;
}
}
else if (containerPos != 0) {
// The container does not contain the start boundary.
boundary = boundaryParents[boundaryPos];
container = containerParents[containerPos];
}
if (container) {
// If the range start is after the container, then make the range invalid.
if (boundary->IndexInParent() > container->IndexInParent()) {
return !!(mRoot = nullptr);
}
// If the range starts before the container, then reduce the range to
// the point starting at the container.
if (boundary->IndexInParent() < container->IndexInParent()) {
container->ToTextPoint(mStartContainer.StartAssignment(), &mStartOffset);
mStartContainer.get()->AddRef();
}
}
boundaryParents.SetLengthAndRetainStorage(0);
containerParents.SetLengthAndRetainStorage(0);
}
boundary = mEndContainer->GetChildAtOffset(mEndOffset);
if (boundary == aContainer) {
return true;
}
// Crop the end boundary.
container = nullptr;
CommonParent(boundary, aContainer, &boundaryParents, &boundaryPos,
&containerParents, &containerPos);
if (boundaryPos == 0) {
if (containerPos != 0) {
aContainer->ToTextPoint(mEndContainer.StartAssignment(), &mEndOffset, false);
static_cast<Accessible*>(mEndContainer)->AddRef();
}
else {
container = aContainer;
}
}
else if (containerPos != 0) {
boundary = boundaryParents[boundaryPos];
container = containerParents[containerPos];
}
if (!container) {
return true;
}
if (boundary->IndexInParent() < container->IndexInParent()) {
return !!(mRoot = nullptr);
}
if (boundary->IndexInParent() > container->IndexInParent()) {
container->ToTextPoint(mEndContainer.StartAssignment(), &mEndOffset, false);
static_cast<Accessible*>(mEndContainer)->AddRef();
}
return true;
}
void
TextRange::FindText(const nsAString& aText, EDirection aDirection,
nsCaseTreatment aCaseSensitive, TextRange* aFoundRange) const
{
}
void
TextRange::FindAttr(EAttr aAttr, nsIVariant* aValue, EDirection aDirection,
TextRange* aFoundRange) const
{
}
void
TextRange::AddToSelection() const
{
}
void
TextRange::RemoveFromSelection() const
{
}
void
TextRange::Select() const
{
}
void
TextRange::ScrollIntoView(EHowToAlign aHow) const
{
}
////////////////////////////////////////////////////////////////////////////////
// pivate
void
TextRange::Set(HyperTextAccessible* aRoot,
HyperTextAccessible* aStartContainer, int32_t aStartOffset,
HyperTextAccessible* aEndContainer, int32_t aEndOffset)
{
mRoot = aRoot;
mStartContainer = aStartContainer;
mEndContainer = aEndContainer;
mStartOffset = aStartOffset;
mEndOffset = aEndOffset;
}
bool
TextRange::TextInternal(nsAString& aText, Accessible* aCurrent,
uint32_t aStartIntlOffset) const
{
bool moveNext = true;
int32_t endIntlOffset = -1;
if (aCurrent->Parent() == mEndContainer &&
mEndContainer->GetChildAtOffset(mEndOffset) == aCurrent) {
uint32_t currentStartOffset = mEndContainer->GetChildOffset(aCurrent);
endIntlOffset = mEndOffset - currentStartOffset;
if (endIntlOffset == 0)
return false;
moveNext = false;
}
if (aCurrent->IsTextLeaf()) {
aCurrent->AppendTextTo(aText, aStartIntlOffset,
endIntlOffset - aStartIntlOffset);
if (!moveNext)
return false;
}
Accessible* next = aCurrent->FirstChild();
if (next) {
if (!TextInternal(aText, next, 0))
return false;
}
next = aCurrent->NextSibling();
if (next) {
if (!TextInternal(aText, next, 0))
return false;
}
return moveNext;
}
void
TextRange::MoveInternal(ETextUnit aUnit, int32_t aCount,
HyperTextAccessible& aContainer, int32_t aOffset,
HyperTextAccessible* aStopContainer, int32_t aStopOffset)
{
}
Accessible*
TextRange::CommonParent(Accessible* aAcc1, Accessible* aAcc2,
nsTArray<Accessible*>* aParents1, uint32_t* aPos1,
nsTArray<Accessible*>* aParents2, uint32_t* aPos2) const
{
if (aAcc1 == aAcc2) {
return aAcc1;
}
MOZ_ASSERT(aParents1->Length() == 0 || aParents2->Length() == 0,
"Wrong arguments");
// Build the chain of parents.
Accessible* p1 = aAcc1;
Accessible* p2 = aAcc2;
do {
aParents1->AppendElement(p1);
p1 = p1->Parent();
} while (p1);
do {
aParents2->AppendElement(p2);
p2 = p2->Parent();
} while (p2);
// Find where the parent chain differs
*aPos1 = aParents1->Length();
*aPos2 = aParents2->Length();
Accessible* parent = nullptr;
uint32_t len = 0;
for (len = std::min(*aPos1, *aPos2); len > 0; --len) {
Accessible* child1 = aParents1->ElementAt(--(*aPos1));
Accessible* child2 = aParents2->ElementAt(--(*aPos2));
if (child1 != child2)
break;
parent = child1;
}
return parent;
}
} // namespace a11y
} // namespace mozilla