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Diffstat (limited to 'accessible/base/TextRange.h')
| -rw-r--r-- | accessible/base/TextRange.h | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/accessible/base/TextRange.h b/accessible/base/TextRange.h new file mode 100644 index 0000000000..59839ff3a7 --- /dev/null +++ b/accessible/base/TextRange.h @@ -0,0 +1,185 @@ +/* -*- 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/. */ + +#ifndef mozilla_a11y_TextRange_h__ +#define mozilla_a11y_TextRange_h__ + +#include <utility> + +#include "nsTArray.h" + +class nsRange; + +namespace mozilla { +namespace dom { +class Selection; +} // namespace dom +namespace a11y { + +class Accessible; +class LocalAccessible; + +/** + * A text point (HyperText + offset), represents a boundary of text range. + * In new code, This should only be used when you explicitly need to deal with + * HyperText containers and offsets, including embedded objects; e.g. for + * IAccessible2 and ATK. Otherwise, use TextLeafPoint instead. + */ +struct TextPoint final { + TextPoint(Accessible* aContainer, int32_t aOffset) + : mContainer(aContainer), mOffset(aOffset) {} + TextPoint(const TextPoint& aPoint) + : mContainer(aPoint.mContainer), mOffset(aPoint.mOffset) {} + + Accessible* mContainer; + int32_t mOffset; + + bool operator==(const TextPoint& aPoint) const { + return mContainer == aPoint.mContainer && mOffset == aPoint.mOffset; + } + bool operator<(const TextPoint& aPoint) const; +}; + +/** + * Represents a HyperText range within the text control or document. + * In new code, This should only be used when you explicitly need to deal with + * HyperText containers and offsets, including embedded objects; e.g. for + * IAccessible2 and ATK. Otherwise, use TextLeafRange instead. + */ +class TextRange final { + public: + TextRange(Accessible* aRoot, Accessible* aStartContainer, + int32_t aStartOffset, Accessible* aEndContainer, + int32_t aEndOffset); + TextRange() : mStartOffset{0}, mEndOffset{0} {} + TextRange(TextRange&& aRange) + : mRoot(std::move(aRange.mRoot)), + mStartContainer(std::move(aRange.mStartContainer)), + mEndContainer(std::move(aRange.mEndContainer)), + mStartOffset(aRange.mStartOffset), + mEndOffset(aRange.mEndOffset) {} + + TextRange& operator=(TextRange&& aRange) { + mRoot = std::move(aRange.mRoot); + mStartContainer = std::move(aRange.mStartContainer); + mEndContainer = std::move(aRange.mEndContainer); + mStartOffset = aRange.mStartOffset; + mEndOffset = aRange.mEndOffset; + return *this; + } + + Accessible* Root() { return mRoot; } + Accessible* StartContainer() const { return mStartContainer; } + int32_t StartOffset() const { return mStartOffset; } + Accessible* EndContainer() const { return mEndContainer; } + int32_t EndOffset() const { return mEndOffset; } + + bool operator==(const TextRange& aRange) const { + return mStartContainer == aRange.mStartContainer && + mStartOffset == aRange.mStartOffset && + mEndContainer == aRange.mEndContainer && + mEndOffset == aRange.mEndOffset; + } + + TextPoint StartPoint() const { + return TextPoint(mStartContainer, mStartOffset); + } + TextPoint EndPoint() const { return TextPoint(mEndContainer, mEndOffset); } + + /** + * Return a container containing both start and end points. + */ + Accessible* Container() const; + + /** + * Return a list of embedded objects enclosed by the text range (includes + * partially overlapped objects). + */ + void EmbeddedChildren(nsTArray<Accessible*>* aChildren) const; + + /** + * Return text enclosed by the range. + */ + void Text(nsAString& aText) const; + + /** + * Crops the range if it overlaps the given accessible element boundaries, + * returns true if the range was cropped successfully. + */ + bool Crop(Accessible* aContainer); + + /** + * Convert stored hypertext offsets into DOM offsets and assign it to DOM + * range. + * + * Note that if start and/or end accessible offsets are in generated content + * such as ::before or + * ::after, the result range excludes the generated content. See also + * ClosestNotGeneratedDOMPoint() for more information. + * + * @param aRange [in, out] the range whose bounds to set + * @param aReversed [out] whether the start/end offsets were reversed. + * @return true if conversion was successful + */ + bool AssignDOMRange(nsRange* aRange, bool* aReversed = nullptr) const; + + /** + * Return true if this TextRange object represents an actual range of text. + */ + bool IsValid() const { return mRoot; } + + void SetStartPoint(Accessible* aContainer, int32_t aOffset) { + mStartContainer = aContainer; + mStartOffset = aOffset; + } + void SetEndPoint(Accessible* aContainer, int32_t aOffset) { + mStartContainer = aContainer; + mStartOffset = aOffset; + } + + static void TextRangesFromSelection(dom::Selection* aSelection, + nsTArray<TextRange>* aRanges); + + private: + TextRange(const TextRange& aRange) = delete; + TextRange& operator=(const TextRange& aRange) = delete; + + friend class HyperTextAccessible; + friend class xpcAccessibleTextRange; + + void Set(Accessible* aRoot, Accessible* aStartContainer, int32_t aStartOffset, + Accessible* aEndContainer, int32_t aEndOffset); + + /** + * Text() method helper. + * @param aText [in,out] calculated text + * @param aCurrent [in] currently traversed node + * @param aStartIntlOffset [in] start offset if current node is a text node + * @return true if calculation is not finished yet + */ + bool TextInternal(nsAString& aText, Accessible* aCurrent, + uint32_t aStartIntlOffset) const; + + /** + * A helper method returning a common parent for two given accessible + * elements. + */ + Accessible* CommonParent(Accessible* aAcc1, Accessible* aAcc2, + nsTArray<Accessible*>* aParents1, uint32_t* aPos1, + nsTArray<Accessible*>* aParents2, + uint32_t* aPos2) const; + + Accessible* mRoot; + Accessible* mStartContainer; + Accessible* mEndContainer; + int32_t mStartOffset; + int32_t mEndOffset; +}; + +} // namespace a11y +} // namespace mozilla + +#endif |