| /* |
| * Copyright (C) 2018 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS |
| * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
| * THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #pragma once |
| |
| #if ENABLE(LAYOUT_FORMATTING_CONTEXT) |
| |
| #include "LayoutUnits.h" |
| |
| namespace WebCore { |
| |
| class RenderStyle; |
| |
| namespace Layout { |
| |
| class InlineItem; |
| class InlineTextItem; |
| struct ContinuousContent; |
| struct WrappedTextContent; |
| |
| class LineBreaker { |
| public: |
| struct PartialRun { |
| unsigned length { 0 }; |
| InlineLayoutUnit logicalWidth { 0 }; |
| bool needsHyphen { false }; |
| }; |
| enum class IsEndOfLine { No, Yes }; |
| struct Result { |
| enum class Action { |
| Keep, // Keep content on the current line. |
| Split, // Partial content is on the current line. |
| Push, // Content is pushed to the next line. |
| RevertToLastWrapOpportunity // The current content overflows and can't get wrapped. The line needs to be reverted back to the last line wrapping opportunity. |
| }; |
| struct PartialTrailingContent { |
| size_t trailingRunIndex { 0 }; |
| Optional<PartialRun> partialRun; // nullopt partial run means the trailing run is a complete run. |
| }; |
| |
| Action action { Action::Keep }; |
| IsEndOfLine isEndOfLine { IsEndOfLine::No }; |
| Optional<PartialTrailingContent> partialTrailingContent { }; |
| const InlineItem* lastWrapOpportunityItem { nullptr }; |
| }; |
| |
| struct Run { |
| Run(const InlineItem&, InlineLayoutUnit); |
| Run(const Run&); |
| Run& operator=(const Run&); |
| |
| const InlineItem& inlineItem; |
| InlineLayoutUnit logicalWidth { 0 }; |
| }; |
| using RunList = Vector<Run, 3>; |
| |
| struct LineStatus { |
| InlineLayoutUnit availableWidth { 0 }; |
| InlineLayoutUnit collapsibleWidth { 0 }; |
| bool lineHasFullyCollapsibleTrailingRun { false }; |
| bool lineIsEmpty { true }; |
| }; |
| Result shouldWrapInlineContent(const RunList& candidateRuns, InlineLayoutUnit candidateContentLogicalWidth, const LineStatus&); |
| |
| void setHyphenationDisabled() { n_hyphenationIsDisabled = true; } |
| |
| private: |
| // This struct represents the amount of content committed to line breaking at a time e.g. |
| // text content <span>span1</span>between<span>span2</span> |
| // [text][ ][content][ ][container start][span1][container end][between][container start][span2][container end] |
| // -> content chunks -> |
| // [text] |
| // [ ] |
| // [content] |
| // [container start][span1][container end][between][container start][span2][container end] |
| // see https://drafts.csswg.org/css-text-3/#line-break-details |
| Optional<WrappedTextContent> wrapTextContent(const RunList&, const LineStatus&) const; |
| Result tryWrappingInlineContent(const RunList&, InlineLayoutUnit candidateContentLogicalWidth, const LineStatus&) const; |
| Optional<PartialRun> tryBreakingTextRun(const Run& overflowRun, InlineLayoutUnit availableWidth) const; |
| |
| enum class WordBreakRule { |
| NoBreak, |
| AtArbitraryPosition, |
| OnlyHyphenationAllowed |
| }; |
| WordBreakRule wordBreakBehavior(const RenderStyle&) const; |
| bool shouldKeepEndOfLineWhitespace(const ContinuousContent&) const; |
| bool isContentWrappingAllowed(const ContinuousContent&) const; |
| |
| bool n_hyphenationIsDisabled { false }; |
| bool m_hasWrapOpportunityAtPreviousPosition { false }; |
| }; |
| |
| inline LineBreaker::Run::Run(const InlineItem& inlineItem, InlineLayoutUnit logicalWidth) |
| : inlineItem(inlineItem) |
| , logicalWidth(logicalWidth) |
| { |
| } |
| |
| inline LineBreaker::Run::Run(const Run& other) |
| : inlineItem(other.inlineItem) |
| , logicalWidth(other.logicalWidth) |
| { |
| } |
| |
| } |
| } |
| #endif |