| /* |
| * (C) 1999 Lars Knoll (knoll@kde.org) |
| * (C) 2000 Dirk Mueller (mueller@kde.org) |
| * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| * |
| */ |
| |
| #ifndef THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_LAYOUT_TEXT_FRAGMENT_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_LAYOUT_TEXT_FRAGMENT_H_ |
| |
| #include "third_party/blink/renderer/core/editing/editing_utilities.h" |
| #include "third_party/blink/renderer/core/layout/layout_text.h" |
| #include "third_party/blink/renderer/platform/heap/handle.h" |
| |
| namespace blink { |
| |
| class FirstLetterPseudoElement; |
| |
| // Used to represent a text substring of an element, e.g., for text runs that |
| // are split because of first letter and that must therefore have different |
| // styles (and positions in the layout tree). |
| // We cache offsets so that text transformations can be applied in such a way |
| // that we can recover the original unaltered string from our corresponding DOM |
| // node. |
| class CORE_EXPORT LayoutTextFragment : public LayoutText { |
| public: |
| ~LayoutTextFragment() override; |
| |
| static LayoutTextFragment* Create(Node*, |
| StringImpl*, |
| int start_offset, |
| int length, |
| LegacyLayout); |
| static LayoutTextFragment* CreateAnonymous(PseudoElement&, |
| StringImpl*, |
| LegacyLayout); |
| static LayoutTextFragment* CreateAnonymous(PseudoElement&, |
| StringImpl*, |
| unsigned start, |
| unsigned length, |
| LegacyLayout); |
| |
| Position PositionForCaretOffset(unsigned) const override; |
| base::Optional<unsigned> CaretOffsetForPosition( |
| const Position&) const override; |
| |
| unsigned Start() const { return start_; } |
| unsigned FragmentLength() const { return fragment_length_; } |
| |
| unsigned TextStartOffset() const override { return Start(); } |
| |
| void SetContentString(StringImpl*); |
| StringImpl* ContentString() const { return content_string_.get(); } |
| // The complete text is all of the text in the associated DOM text node. |
| scoped_refptr<StringImpl> CompleteText() const; |
| // The fragment text is the text which will be used by this |
| // LayoutTextFragment. For things like first-letter this may differ from the |
| // completeText as we maybe using only a portion of the text nodes content. |
| |
| scoped_refptr<StringImpl> OriginalText() const override; |
| |
| void SetTextFragment(scoped_refptr<StringImpl>, |
| unsigned start, |
| unsigned length); |
| |
| void TransformText() override; |
| |
| const char* GetName() const override { return "LayoutTextFragment"; } |
| |
| void SetFirstLetterPseudoElement(FirstLetterPseudoElement* element) { |
| first_letter_pseudo_element_ = element; |
| } |
| FirstLetterPseudoElement* GetFirstLetterPseudoElement() const { |
| return first_letter_pseudo_element_; |
| } |
| |
| void SetIsRemainingTextLayoutObject(bool is_remaining_text) { |
| is_remaining_text_layout_object_ = is_remaining_text; |
| } |
| bool IsRemainingTextLayoutObject() const { |
| return is_remaining_text_layout_object_; |
| } |
| |
| Text* AssociatedTextNode() const; |
| LayoutText* GetFirstLetterPart() const override; |
| |
| protected: |
| friend class LayoutObjectFactory; |
| LayoutTextFragment(Node*, StringImpl*, int start_offset, int length); |
| void WillBeDestroyed() override; |
| |
| private: |
| LayoutBlock* BlockForAccompanyingFirstLetter() const; |
| UChar PreviousCharacter() const override; |
| void TextDidChange() override; |
| |
| void UpdateHitTestResult(HitTestResult&, |
| const PhysicalOffset&) const override; |
| |
| unsigned start_; |
| unsigned fragment_length_; |
| bool is_remaining_text_layout_object_; |
| scoped_refptr<StringImpl> content_string_; |
| // Reference back to FirstLetterPseudoElement; cleared by |
| // FirstLetterPseudoElement::detachLayoutTree() if it goes away first. |
| UntracedMember<FirstLetterPseudoElement> first_letter_pseudo_element_; |
| }; |
| |
| DEFINE_TYPE_CASTS(LayoutTextFragment, |
| LayoutObject, |
| object, |
| (object->IsText() && ToLayoutText(object)->IsTextFragment()), |
| (object.IsText() && ToLayoutText(object).IsTextFragment())); |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_LAYOUT_TEXT_FRAGMENT_H_ |