mirror of
https://github.com/mozilla/gecko-dev.git
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381 lines
10 KiB
C++
381 lines
10 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "TextRange-inl.h"
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#include "Accessible-inl.h"
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#include "nsAccUtils.h"
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namespace mozilla {
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namespace a11y {
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////////////////////////////////////////////////////////////////////////////////
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// TextPoint
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bool
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TextPoint::operator <(const TextPoint& aPoint) const
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{
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if (mContainer == aPoint.mContainer)
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return mOffset < aPoint.mOffset;
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// Build the chain of parents
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Accessible* p1 = mContainer;
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Accessible* p2 = aPoint.mContainer;
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AutoTArray<Accessible*, 30> parents1, parents2;
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do {
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parents1.AppendElement(p1);
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p1 = p1->Parent();
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} while (p1);
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do {
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parents2.AppendElement(p2);
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p2 = p2->Parent();
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} while (p2);
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// Find where the parent chain differs
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uint32_t pos1 = parents1.Length(), pos2 = parents2.Length();
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for (uint32_t len = std::min(pos1, pos2); len > 0; --len) {
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Accessible* child1 = parents1.ElementAt(--pos1);
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Accessible* child2 = parents2.ElementAt(--pos2);
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if (child1 != child2)
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return child1->IndexInParent() < child2->IndexInParent();
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}
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NS_ERROR("Broken tree?!");
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return false;
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}
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////////////////////////////////////////////////////////////////////////////////
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// TextRange
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TextRange::TextRange(HyperTextAccessible* aRoot,
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HyperTextAccessible* aStartContainer, int32_t aStartOffset,
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HyperTextAccessible* aEndContainer, int32_t aEndOffset) :
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mRoot(aRoot), mStartContainer(aStartContainer), mEndContainer(aEndContainer),
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mStartOffset(aStartOffset), mEndOffset(aEndOffset)
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{
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}
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void
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TextRange::EmbeddedChildren(nsTArray<Accessible*>* aChildren) const
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{
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if (mStartContainer == mEndContainer) {
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int32_t startIdx = mStartContainer->GetChildIndexAtOffset(mStartOffset);
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int32_t endIdx = mStartContainer->GetChildIndexAtOffset(mEndOffset);
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for (int32_t idx = startIdx; idx <= endIdx; idx++) {
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Accessible* child = mStartContainer->GetChildAt(idx);
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if (!child->IsText()) {
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aChildren->AppendElement(child);
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}
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}
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return;
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}
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Accessible* p1 = mStartContainer->GetChildAtOffset(mStartOffset);
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Accessible* p2 = mEndContainer->GetChildAtOffset(mEndOffset);
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uint32_t pos1 = 0, pos2 = 0;
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AutoTArray<Accessible*, 30> parents1, parents2;
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Accessible* container =
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CommonParent(p1, p2, &parents1, &pos1, &parents2, &pos2);
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// Traverse the tree up to the container and collect embedded objects.
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for (uint32_t idx = 0; idx < pos1 - 1; idx++) {
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Accessible* parent = parents1[idx + 1];
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Accessible* child = parents1[idx];
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uint32_t childCount = parent->ChildCount();
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for (uint32_t childIdx = child->IndexInParent(); childIdx < childCount; childIdx++) {
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Accessible* next = parent->GetChildAt(childIdx);
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if (!next->IsText()) {
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aChildren->AppendElement(next);
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}
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}
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}
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// Traverse through direct children in the container.
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int32_t endIdx = parents2[pos2 - 1]->IndexInParent();
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int32_t childIdx = parents1[pos1 - 1]->IndexInParent() + 1;
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for (; childIdx < endIdx; childIdx++) {
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Accessible* next = container->GetChildAt(childIdx);
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if (!next->IsText()) {
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aChildren->AppendElement(next);
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}
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}
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// Traverse down from the container to end point.
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for (int32_t idx = pos2 - 2; idx > 0; idx--) {
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Accessible* parent = parents2[idx];
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Accessible* child = parents2[idx - 1];
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int32_t endIdx = child->IndexInParent();
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for (int32_t childIdx = 0; childIdx < endIdx; childIdx++) {
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Accessible* next = parent->GetChildAt(childIdx);
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if (!next->IsText()) {
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aChildren->AppendElement(next);
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}
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}
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}
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}
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void
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TextRange::Text(nsAString& aText) const
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{
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Accessible* current = mStartContainer->GetChildAtOffset(mStartOffset);
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uint32_t startIntlOffset =
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mStartOffset - mStartContainer->GetChildOffset(current);
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while (current && TextInternal(aText, current, startIntlOffset)) {
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current = current->Parent();
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if (!current)
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break;
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current = current->NextSibling();
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}
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}
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void
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TextRange::Bounds(nsTArray<nsIntRect> aRects) const
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{
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}
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void
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TextRange::Normalize(ETextUnit aUnit)
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{
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}
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bool
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TextRange::Crop(Accessible* aContainer)
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{
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uint32_t boundaryPos = 0, containerPos = 0;
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AutoTArray<Accessible*, 30> boundaryParents, containerParents;
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// Crop the start boundary.
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Accessible* container = nullptr;
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Accessible* boundary = mStartContainer->GetChildAtOffset(mStartOffset);
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if (boundary != aContainer) {
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CommonParent(boundary, aContainer, &boundaryParents, &boundaryPos,
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&containerParents, &containerPos);
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if (boundaryPos == 0) {
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if (containerPos != 0) {
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// The container is contained by the start boundary, reduce the range to
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// the point starting at the container.
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aContainer->ToTextPoint(mStartContainer.StartAssignment(), &mStartOffset);
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static_cast<Accessible*>(mStartContainer)->AddRef();
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}
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else {
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// The start boundary and the container are siblings.
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container = aContainer;
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}
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}
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else if (containerPos != 0) {
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// The container does not contain the start boundary.
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boundary = boundaryParents[boundaryPos];
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container = containerParents[containerPos];
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}
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if (container) {
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// If the range start is after the container, then make the range invalid.
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if (boundary->IndexInParent() > container->IndexInParent()) {
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return !!(mRoot = nullptr);
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}
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// If the range starts before the container, then reduce the range to
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// the point starting at the container.
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if (boundary->IndexInParent() < container->IndexInParent()) {
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container->ToTextPoint(mStartContainer.StartAssignment(), &mStartOffset);
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mStartContainer.get()->AddRef();
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}
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}
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boundaryParents.SetLengthAndRetainStorage(0);
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containerParents.SetLengthAndRetainStorage(0);
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}
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boundary = mEndContainer->GetChildAtOffset(mEndOffset);
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if (boundary == aContainer) {
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return true;
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}
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// Crop the end boundary.
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container = nullptr;
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CommonParent(boundary, aContainer, &boundaryParents, &boundaryPos,
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&containerParents, &containerPos);
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if (boundaryPos == 0) {
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if (containerPos != 0) {
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aContainer->ToTextPoint(mEndContainer.StartAssignment(), &mEndOffset, false);
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static_cast<Accessible*>(mEndContainer)->AddRef();
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}
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else {
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container = aContainer;
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}
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}
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else if (containerPos != 0) {
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boundary = boundaryParents[boundaryPos];
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container = containerParents[containerPos];
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}
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if (!container) {
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return true;
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}
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if (boundary->IndexInParent() < container->IndexInParent()) {
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return !!(mRoot = nullptr);
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}
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if (boundary->IndexInParent() > container->IndexInParent()) {
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container->ToTextPoint(mEndContainer.StartAssignment(), &mEndOffset, false);
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static_cast<Accessible*>(mEndContainer)->AddRef();
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}
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return true;
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}
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void
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TextRange::FindText(const nsAString& aText, EDirection aDirection,
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nsCaseTreatment aCaseSensitive, TextRange* aFoundRange) const
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{
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}
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void
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TextRange::FindAttr(EAttr aAttr, nsIVariant* aValue, EDirection aDirection,
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TextRange* aFoundRange) const
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{
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}
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void
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TextRange::AddToSelection() const
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{
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}
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void
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TextRange::RemoveFromSelection() const
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{
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}
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void
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TextRange::Select() const
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{
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}
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void
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TextRange::ScrollIntoView(EHowToAlign aHow) const
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{
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}
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////////////////////////////////////////////////////////////////////////////////
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// pivate
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void
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TextRange::Set(HyperTextAccessible* aRoot,
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HyperTextAccessible* aStartContainer, int32_t aStartOffset,
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HyperTextAccessible* aEndContainer, int32_t aEndOffset)
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{
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mRoot = aRoot;
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mStartContainer = aStartContainer;
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mEndContainer = aEndContainer;
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mStartOffset = aStartOffset;
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mEndOffset = aEndOffset;
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}
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bool
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TextRange::TextInternal(nsAString& aText, Accessible* aCurrent,
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uint32_t aStartIntlOffset) const
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{
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bool moveNext = true;
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int32_t endIntlOffset = -1;
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if (aCurrent->Parent() == mEndContainer &&
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mEndContainer->GetChildAtOffset(mEndOffset) == aCurrent) {
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uint32_t currentStartOffset = mEndContainer->GetChildOffset(aCurrent);
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endIntlOffset = mEndOffset - currentStartOffset;
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if (endIntlOffset == 0)
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return false;
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moveNext = false;
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}
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if (aCurrent->IsTextLeaf()) {
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aCurrent->AppendTextTo(aText, aStartIntlOffset,
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endIntlOffset - aStartIntlOffset);
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if (!moveNext)
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return false;
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}
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Accessible* next = aCurrent->FirstChild();
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if (next) {
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if (!TextInternal(aText, next, 0))
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return false;
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}
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next = aCurrent->NextSibling();
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if (next) {
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if (!TextInternal(aText, next, 0))
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return false;
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}
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return moveNext;
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}
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void
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TextRange::MoveInternal(ETextUnit aUnit, int32_t aCount,
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HyperTextAccessible& aContainer, int32_t aOffset,
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HyperTextAccessible* aStopContainer, int32_t aStopOffset)
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{
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}
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Accessible*
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TextRange::CommonParent(Accessible* aAcc1, Accessible* aAcc2,
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nsTArray<Accessible*>* aParents1, uint32_t* aPos1,
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nsTArray<Accessible*>* aParents2, uint32_t* aPos2) const
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{
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if (aAcc1 == aAcc2) {
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return aAcc1;
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}
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MOZ_ASSERT(aParents1->Length() == 0 || aParents2->Length() == 0,
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"Wrong arguments");
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// Build the chain of parents.
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Accessible* p1 = aAcc1;
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Accessible* p2 = aAcc2;
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do {
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aParents1->AppendElement(p1);
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p1 = p1->Parent();
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} while (p1);
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do {
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aParents2->AppendElement(p2);
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p2 = p2->Parent();
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} while (p2);
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// Find where the parent chain differs
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*aPos1 = aParents1->Length();
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*aPos2 = aParents2->Length();
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Accessible* parent = nullptr;
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uint32_t len = 0;
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for (len = std::min(*aPos1, *aPos2); len > 0; --len) {
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Accessible* child1 = aParents1->ElementAt(--(*aPos1));
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Accessible* child2 = aParents2->ElementAt(--(*aPos2));
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if (child1 != child2)
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break;
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parent = child1;
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}
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return parent;
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}
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} // namespace a11y
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} // namespace mozilla
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