| /* |
| * Copyright (C) 1999 Lars Knoll (knoll@kde.org) |
| * (C) 1999 Antti Koivisto (koivisto@kde.org) |
| * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. |
| * All rights reserved. |
| * Copyright (C) 2006 Andrew Wellington (proton@wiretapped.net) |
| * Copyright (C) 2010 Daniel Bates (dbates@intudata.com) |
| * |
| * 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. |
| * |
| */ |
| |
| #include "third_party/blink/renderer/core/layout/layout_list_marker.h" |
| |
| #include "third_party/blink/renderer/core/layout/api/line_layout_block_flow.h" |
| #include "third_party/blink/renderer/core/layout/layout_analyzer.h" |
| #include "third_party/blink/renderer/core/layout/layout_list_item.h" |
| #include "third_party/blink/renderer/core/layout/list_marker_text.h" |
| #include "third_party/blink/renderer/core/paint/list_marker_painter.h" |
| #include "third_party/blink/renderer/platform/fonts/font.h" |
| |
| namespace blink { |
| |
| const int kCMarkerPaddingPx = 7; |
| |
| // TODO(glebl): Move to core/html/resources/html.css after |
| // Blink starts to support ::marker crbug.com/457718 |
| // Recommended UA margin for list markers. |
| const int kCUAMarkerMarginEm = 1; |
| |
| LayoutListMarker::LayoutListMarker(LayoutListItem* item) |
| : LayoutBox(nullptr), list_item_(item), line_offset_() { |
| SetInline(true); |
| SetIsAtomicInlineLevel(true); |
| } |
| |
| LayoutListMarker::~LayoutListMarker() = default; |
| |
| void LayoutListMarker::WillBeDestroyed() { |
| if (image_) |
| image_->RemoveClient(this); |
| LayoutBox::WillBeDestroyed(); |
| } |
| |
| LayoutListMarker* LayoutListMarker::CreateAnonymous(LayoutListItem* item) { |
| Document& document = item->GetDocument(); |
| LayoutListMarker* layout_object = new LayoutListMarker(item); |
| layout_object->SetDocumentForAnonymous(&document); |
| return layout_object; |
| } |
| |
| LayoutSize LayoutListMarker::ImageBulletSize() const { |
| DCHECK(IsImage()); |
| const SimpleFontData* font_data = StyleRef().GetFont().PrimaryFont(); |
| DCHECK(font_data); |
| if (!font_data) |
| return LayoutSize(); |
| |
| // FIXME: This is a somewhat arbitrary default width. Generated images for |
| // markers really won't become particularly useful until we support the CSS3 |
| // marker pseudoclass to allow control over the width and height of the |
| // marker box. |
| LayoutUnit bullet_width = |
| font_data->GetFontMetrics().Ascent() / LayoutUnit(2); |
| return RoundedLayoutSize( |
| image_->ImageSize(GetDocument(), StyleRef().EffectiveZoom(), |
| LayoutSize(bullet_width, bullet_width), |
| LayoutObject::ShouldRespectImageOrientation(this))); |
| } |
| |
| void LayoutListMarker::StyleWillChange(StyleDifference diff, |
| const ComputedStyle& new_style) { |
| if (Style() && |
| (new_style.ListStylePosition() != StyleRef().ListStylePosition() || |
| new_style.ListStyleType() != StyleRef().ListStyleType() || |
| (new_style.ListStyleType() == EListStyleType::kString && |
| new_style.ListStyleStringValue() != |
| StyleRef().ListStyleStringValue()))) { |
| SetNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation( |
| layout_invalidation_reason::kStyleChange); |
| } |
| |
| LayoutBox::StyleWillChange(diff, new_style); |
| } |
| |
| void LayoutListMarker::StyleDidChange(StyleDifference diff, |
| const ComputedStyle* old_style) { |
| LayoutBox::StyleDidChange(diff, old_style); |
| |
| if (image_ != StyleRef().ListStyleImage()) { |
| if (image_) |
| image_->RemoveClient(this); |
| image_ = StyleRef().ListStyleImage(); |
| if (image_) |
| image_->AddClient(this); |
| } |
| } |
| |
| InlineBox* LayoutListMarker::CreateInlineBox() { |
| InlineBox* result = LayoutBox::CreateInlineBox(); |
| result->SetIsText(IsText()); |
| return result; |
| } |
| |
| bool LayoutListMarker::IsImage() const { |
| return image_ && !image_->ErrorOccurred(); |
| } |
| |
| void LayoutListMarker::Paint(const PaintInfo& paint_info) const { |
| ListMarkerPainter(*this).Paint(paint_info); |
| } |
| |
| void LayoutListMarker::UpdateLayout() { |
| DCHECK(NeedsLayout()); |
| LayoutAnalyzer::Scope analyzer(*this); |
| |
| LayoutUnit block_offset = LogicalTop(); |
| for (LayoutBox* o = ParentBox(); o && o != ListItem(); o = o->ParentBox()) { |
| block_offset += o->LogicalTop(); |
| } |
| if (ListItem()->StyleRef().IsLeftToRightDirection()) { |
| line_offset_ = ListItem()->LogicalLeftOffsetForLine( |
| block_offset, kDoNotIndentText, LayoutUnit()); |
| } else { |
| line_offset_ = ListItem()->LogicalRightOffsetForLine( |
| block_offset, kDoNotIndentText, LayoutUnit()); |
| } |
| if (IsImage()) { |
| UpdateMarginsAndContent(); |
| LayoutSize image_size(ImageBulletSize()); |
| SetWidth(image_size.Width()); |
| SetHeight(image_size.Height()); |
| } else { |
| const SimpleFontData* font_data = StyleRef().GetFont().PrimaryFont(); |
| DCHECK(font_data); |
| SetLogicalWidth(MinPreferredLogicalWidth()); |
| SetLogicalHeight( |
| LayoutUnit(font_data ? font_data->GetFontMetrics().Height() : 0)); |
| } |
| |
| SetMarginStart(LayoutUnit()); |
| SetMarginEnd(LayoutUnit()); |
| |
| const Length& start_margin = StyleRef().MarginStart(); |
| const Length& end_margin = StyleRef().MarginEnd(); |
| if (start_margin.IsFixed()) |
| SetMarginStart(LayoutUnit(start_margin.Value())); |
| if (end_margin.IsFixed()) |
| SetMarginEnd(LayoutUnit(end_margin.Value())); |
| |
| ClearNeedsLayout(); |
| } |
| |
| void LayoutListMarker::ImageChanged(WrappedImagePtr o, CanDeferInvalidation) { |
| // A list marker can't have a background or border image, so no need to call |
| // the base class method. |
| if (!image_ || o != image_->Data()) |
| return; |
| |
| LayoutSize image_size = IsImage() ? ImageBulletSize() : LayoutSize(); |
| if (Size() != image_size || image_->ErrorOccurred()) { |
| SetNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation( |
| layout_invalidation_reason::kImageChanged); |
| } else { |
| SetShouldDoFullPaintInvalidation(); |
| } |
| } |
| |
| void LayoutListMarker::UpdateMarginsAndContent() { |
| if (PreferredLogicalWidthsDirty()) |
| ComputePreferredLogicalWidths(); |
| else |
| UpdateMargins(); |
| } |
| |
| void LayoutListMarker::UpdateContent() { |
| DCHECK(PreferredLogicalWidthsDirty()); |
| |
| text_ = ""; |
| |
| if (IsImage()) |
| return; |
| |
| switch (GetListStyleCategory()) { |
| case ListStyleCategory::kNone: |
| break; |
| case ListStyleCategory::kSymbol: |
| text_ = list_marker_text::GetText(StyleRef().ListStyleType(), |
| 0); // value is ignored for these types |
| break; |
| case ListStyleCategory::kLanguage: |
| text_ = list_marker_text::GetText(StyleRef().ListStyleType(), |
| list_item_->Value()); |
| break; |
| case ListStyleCategory::kStaticString: |
| text_ = StyleRef().ListStyleStringValue(); |
| break; |
| } |
| } |
| |
| String LayoutListMarker::TextAlternative() const { |
| if (GetListStyleCategory() == ListStyleCategory::kStaticString) |
| return text_; |
| UChar suffix = |
| list_marker_text::Suffix(StyleRef().ListStyleType(), list_item_->Value()); |
| // Return suffix after the marker text, even in RTL, reflecting speech order. |
| return text_ + suffix + ' '; |
| } |
| |
| LayoutUnit LayoutListMarker::GetWidthOfText(ListStyleCategory category) const { |
| // TODO(crbug.com/1012289): this code doesn't support bidi algorithm. |
| if (text_.IsEmpty()) |
| return LayoutUnit(); |
| const Font& font = StyleRef().GetFont(); |
| LayoutUnit item_width = LayoutUnit(font.Width(TextRun(text_))); |
| if (category == ListStyleCategory::kStaticString) { |
| // Don't add a suffix. |
| return item_width; |
| } |
| // TODO(wkorman): Look into constructing a text run for both text and suffix |
| // and painting them together. |
| UChar suffix[2] = { |
| list_marker_text::Suffix(StyleRef().ListStyleType(), list_item_->Value()), |
| ' '}; |
| TextRun run = |
| ConstructTextRun(font, suffix, 2, StyleRef(), StyleRef().Direction()); |
| LayoutUnit suffix_space_width = LayoutUnit(font.Width(run)); |
| return item_width + suffix_space_width; |
| } |
| |
| void LayoutListMarker::ComputePreferredLogicalWidths() { |
| DCHECK(PreferredLogicalWidthsDirty()); |
| UpdateContent(); |
| |
| if (IsImage()) { |
| LayoutSize image_size(ImageBulletSize()); |
| min_preferred_logical_width_ = max_preferred_logical_width_ = |
| StyleRef().IsHorizontalWritingMode() ? image_size.Width() |
| : image_size.Height(); |
| ClearPreferredLogicalWidthsDirty(); |
| UpdateMargins(); |
| return; |
| } |
| |
| LayoutUnit logical_width; |
| ListStyleCategory category = GetListStyleCategory(); |
| switch (category) { |
| case ListStyleCategory::kNone: |
| break; |
| case ListStyleCategory::kSymbol: |
| logical_width = WidthOfSymbol(StyleRef()); |
| break; |
| case ListStyleCategory::kLanguage: |
| case ListStyleCategory::kStaticString: |
| logical_width = GetWidthOfText(category); |
| break; |
| } |
| |
| min_preferred_logical_width_ = logical_width; |
| max_preferred_logical_width_ = logical_width; |
| |
| ClearPreferredLogicalWidthsDirty(); |
| |
| UpdateMargins(); |
| } |
| |
| LayoutUnit LayoutListMarker::WidthOfSymbol(const ComputedStyle& style) { |
| const Font& font = style.GetFont(); |
| const SimpleFontData* font_data = font.PrimaryFont(); |
| DCHECK(font_data); |
| if (!font_data) |
| return LayoutUnit(); |
| return LayoutUnit((font_data->GetFontMetrics().Ascent() * 2 / 3 + 1) / 2 + 2); |
| } |
| |
| void LayoutListMarker::UpdateMargins() { |
| LayoutUnit margin_start; |
| LayoutUnit margin_end; |
| const ComputedStyle& style = StyleRef(); |
| if (IsInside()) { |
| std::tie(margin_start, margin_end) = |
| InlineMarginsForInside(style, IsImage()); |
| } else { |
| std::tie(margin_start, margin_end) = |
| InlineMarginsForOutside(style, IsImage(), MinPreferredLogicalWidth()); |
| } |
| |
| Length start_length = Length::Fixed(margin_start); |
| Length end_length = Length::Fixed(margin_end); |
| |
| if (start_length != style.MarginStart() || end_length != style.MarginEnd()) { |
| scoped_refptr<ComputedStyle> new_style = ComputedStyle::Clone(style); |
| new_style->SetMarginStart(start_length); |
| new_style->SetMarginEnd(end_length); |
| SetStyleInternal(std::move(new_style)); |
| } |
| } |
| |
| std::pair<LayoutUnit, LayoutUnit> LayoutListMarker::InlineMarginsForInside( |
| const ComputedStyle& style, |
| bool is_image) { |
| if (style.GetContentData()) |
| return {}; |
| if (is_image) |
| return {LayoutUnit(), LayoutUnit(kCMarkerPaddingPx)}; |
| switch (GetListStyleCategory(style.ListStyleType())) { |
| case ListStyleCategory::kSymbol: |
| return {LayoutUnit(-1), |
| LayoutUnit(kCUAMarkerMarginEm * style.ComputedFontSize())}; |
| default: |
| break; |
| } |
| return {}; |
| } |
| |
| std::pair<LayoutUnit, LayoutUnit> LayoutListMarker::InlineMarginsForOutside( |
| const ComputedStyle& style, |
| bool is_image, |
| LayoutUnit marker_inline_size) { |
| LayoutUnit margin_start; |
| LayoutUnit margin_end; |
| if (style.GetContentData()) { |
| margin_start = -marker_inline_size; |
| } else if (is_image) { |
| margin_start = -marker_inline_size - kCMarkerPaddingPx; |
| margin_end = LayoutUnit(kCMarkerPaddingPx); |
| } else { |
| switch (GetListStyleCategory(style.ListStyleType())) { |
| case ListStyleCategory::kNone: |
| break; |
| case ListStyleCategory::kSymbol: { |
| const SimpleFontData* font_data = style.GetFont().PrimaryFont(); |
| DCHECK(font_data); |
| if (!font_data) |
| return {}; |
| const FontMetrics& font_metrics = font_data->GetFontMetrics(); |
| int offset = font_metrics.Ascent() * 2 / 3; |
| margin_start = LayoutUnit(-offset - kCMarkerPaddingPx - 1); |
| margin_end = offset + kCMarkerPaddingPx + 1 - marker_inline_size; |
| break; |
| } |
| default: |
| margin_start = -marker_inline_size; |
| } |
| } |
| DCHECK_EQ(margin_start + margin_end, -marker_inline_size); |
| return {margin_start, margin_end}; |
| } |
| |
| LayoutUnit LayoutListMarker::LineHeight( |
| bool first_line, |
| LineDirectionMode direction, |
| LinePositionMode line_position_mode) const { |
| if (!IsImage()) |
| return list_item_->LineHeight(first_line, direction, |
| kPositionOfInteriorLineBoxes); |
| return LayoutBox::LineHeight(first_line, direction, line_position_mode); |
| } |
| |
| LayoutUnit LayoutListMarker::BaselinePosition( |
| FontBaseline baseline_type, |
| bool first_line, |
| LineDirectionMode direction, |
| LinePositionMode line_position_mode) const { |
| DCHECK_EQ(line_position_mode, kPositionOnContainingLine); |
| if (!IsImage()) |
| return list_item_->BaselinePosition(baseline_type, first_line, direction, |
| kPositionOfInteriorLineBoxes); |
| return LayoutBox::BaselinePosition(baseline_type, first_line, direction, |
| line_position_mode); |
| } |
| |
| LayoutListMarker::ListStyleCategory LayoutListMarker::GetListStyleCategory() |
| const { |
| return GetListStyleCategory(StyleRef().ListStyleType()); |
| } |
| |
| LayoutListMarker::ListStyleCategory LayoutListMarker::GetListStyleCategory( |
| EListStyleType type) { |
| switch (type) { |
| case EListStyleType::kNone: |
| return ListStyleCategory::kNone; |
| case EListStyleType::kString: |
| return ListStyleCategory::kStaticString; |
| case EListStyleType::kDisc: |
| case EListStyleType::kCircle: |
| case EListStyleType::kSquare: |
| return ListStyleCategory::kSymbol; |
| case EListStyleType::kArabicIndic: |
| case EListStyleType::kArmenian: |
| case EListStyleType::kBengali: |
| case EListStyleType::kCambodian: |
| case EListStyleType::kCjkIdeographic: |
| case EListStyleType::kCjkEarthlyBranch: |
| case EListStyleType::kCjkHeavenlyStem: |
| case EListStyleType::kDecimalLeadingZero: |
| case EListStyleType::kDecimal: |
| case EListStyleType::kDevanagari: |
| case EListStyleType::kEthiopicHalehame: |
| case EListStyleType::kEthiopicHalehameAm: |
| case EListStyleType::kEthiopicHalehameTiEr: |
| case EListStyleType::kEthiopicHalehameTiEt: |
| case EListStyleType::kGeorgian: |
| case EListStyleType::kGujarati: |
| case EListStyleType::kGurmukhi: |
| case EListStyleType::kHangul: |
| case EListStyleType::kHangulConsonant: |
| case EListStyleType::kHebrew: |
| case EListStyleType::kHiragana: |
| case EListStyleType::kHiraganaIroha: |
| case EListStyleType::kKannada: |
| case EListStyleType::kKatakana: |
| case EListStyleType::kKatakanaIroha: |
| case EListStyleType::kKhmer: |
| case EListStyleType::kKoreanHangulFormal: |
| case EListStyleType::kKoreanHanjaFormal: |
| case EListStyleType::kKoreanHanjaInformal: |
| case EListStyleType::kLao: |
| case EListStyleType::kLowerAlpha: |
| case EListStyleType::kLowerArmenian: |
| case EListStyleType::kLowerGreek: |
| case EListStyleType::kLowerLatin: |
| case EListStyleType::kLowerRoman: |
| case EListStyleType::kMalayalam: |
| case EListStyleType::kMongolian: |
| case EListStyleType::kMyanmar: |
| case EListStyleType::kOriya: |
| case EListStyleType::kPersian: |
| case EListStyleType::kSimpChineseFormal: |
| case EListStyleType::kSimpChineseInformal: |
| case EListStyleType::kTelugu: |
| case EListStyleType::kThai: |
| case EListStyleType::kTibetan: |
| case EListStyleType::kTradChineseFormal: |
| case EListStyleType::kTradChineseInformal: |
| case EListStyleType::kUpperAlpha: |
| case EListStyleType::kUpperArmenian: |
| case EListStyleType::kUpperLatin: |
| case EListStyleType::kUpperRoman: |
| case EListStyleType::kUrdu: |
| return ListStyleCategory::kLanguage; |
| default: |
| NOTREACHED(); |
| return ListStyleCategory::kLanguage; |
| } |
| } |
| |
| bool LayoutListMarker::IsInside() const { |
| return list_item_->Ordinal().NotInList() || |
| StyleRef().ListStylePosition() == EListStylePosition::kInside; |
| } |
| |
| LayoutRect LayoutListMarker::GetRelativeMarkerRect() const { |
| if (IsImage()) |
| return LayoutRect(LayoutPoint(), ImageBulletSize()); |
| |
| LayoutRect relative_rect; |
| ListStyleCategory category = GetListStyleCategory(); |
| switch (category) { |
| case ListStyleCategory::kNone: |
| return LayoutRect(); |
| case ListStyleCategory::kSymbol: |
| return RelativeSymbolMarkerRect(StyleRef(), Size().Width()); |
| case ListStyleCategory::kLanguage: |
| case ListStyleCategory::kStaticString: { |
| const SimpleFontData* font_data = StyleRef().GetFont().PrimaryFont(); |
| DCHECK(font_data); |
| if (!font_data) |
| return relative_rect; |
| relative_rect = |
| LayoutRect(LayoutUnit(), LayoutUnit(), GetWidthOfText(category), |
| LayoutUnit(font_data->GetFontMetrics().Height())); |
| break; |
| } |
| } |
| |
| if (!StyleRef().IsHorizontalWritingMode()) { |
| relative_rect = relative_rect.TransposedRect(); |
| relative_rect.SetX(Size().Width() - relative_rect.X() - |
| relative_rect.Width()); |
| } |
| return relative_rect; |
| } |
| |
| LayoutRect LayoutListMarker::RelativeSymbolMarkerRect( |
| const ComputedStyle& style, |
| LayoutUnit width) { |
| LayoutRect relative_rect; |
| const SimpleFontData* font_data = style.GetFont().PrimaryFont(); |
| DCHECK(font_data); |
| if (!font_data) |
| return LayoutRect(); |
| |
| // TODO(wkorman): Review and clean up/document the calculations below. |
| // http://crbug.com/543193 |
| const FontMetrics& font_metrics = font_data->GetFontMetrics(); |
| int ascent = font_metrics.Ascent(); |
| int bullet_width = (ascent * 2 / 3 + 1) / 2; |
| relative_rect = LayoutRect(1, 3 * (ascent - ascent * 2 / 3) / 2, bullet_width, |
| bullet_width); |
| if (!style.IsHorizontalWritingMode()) { |
| relative_rect = relative_rect.TransposedRect(); |
| relative_rect.SetX(width - relative_rect.X() - relative_rect.Width()); |
| } |
| return relative_rect; |
| } |
| |
| void LayoutListMarker::ListItemStyleDidChange() { |
| Element* list_item = To<Element>(list_item_->GetNode()); |
| const ComputedStyle* cached_marker_style = |
| list_item->CachedStyleForPseudoElement(kPseudoIdMarker); |
| scoped_refptr<ComputedStyle> new_style = |
| cached_marker_style ? ComputedStyle::Clone(*cached_marker_style) |
| : list_item->StyleForPseudoElement(kPseudoIdMarker); |
| DCHECK(new_style); |
| if (Style()) { |
| // Reuse the current margins. Otherwise resetting the margins to initial |
| // values would trigger unnecessary layout. |
| new_style->SetMarginStart(StyleRef().MarginStart()); |
| new_style->SetMarginEnd(StyleRef().MarginRight()); |
| } |
| SetStyle(std::move(new_style)); |
| } |
| |
| } // namespace blink |
