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/*
* (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 2000 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2004-2021 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.
*
*/
#pragma once
#include "RenderElement.h"
#include "RenderTextLineBoxes.h"
#include "Text.h"
#include <wtf/Forward.h>
#include <wtf/text/TextBreakIterator.h>
namespace WebCore {
class Font;
class LegacyInlineTextBox;
struct GlyphOverflow;
struct WordTrailingSpace;
namespace LayoutIntegration {
class LineLayout;
}
class RenderText : public RenderObject {
WTF_MAKE_ISO_ALLOCATED(RenderText);
public:
RenderText(Text&, const String&);
RenderText(Document&, const String&);
virtual ~RenderText();
WEBCORE_EXPORT Text* textNode() const;
virtual bool isTextFragment() const;
const RenderStyle& style() const;
const RenderStyle& firstLineStyle() const;
const RenderStyle* getCachedPseudoStyle(PseudoId, const RenderStyle* parentStyle = nullptr) const;
Color selectionBackgroundColor() const;
Color selectionForegroundColor() const;
Color selectionEmphasisMarkColor() const;
std::unique_ptr<RenderStyle> selectionPseudoStyle() const;
virtual String originalText() const;
void extractTextBox(LegacyInlineTextBox& box) { m_lineBoxes.extract(box); }
void attachTextBox(LegacyInlineTextBox& box) { m_lineBoxes.attach(box); }
void removeTextBox(LegacyInlineTextBox& box) { m_lineBoxes.remove(box); }
StringImpl& text() const { return *m_text.impl(); } // Since m_text can never be null, returning this type means callers won't null check.
String textWithoutConvertingBackslashToYenSymbol() const;
LegacyInlineTextBox* createInlineTextBox() { return m_lineBoxes.createAndAppendLineBox(*this); }
void dirtyLineBoxes(bool fullLayout);
void deleteLineBoxes();
void absoluteRects(Vector<IntRect>&, const LayoutPoint& accumulatedOffset) const final;
Vector<IntRect> absoluteRectsForRange(unsigned startOffset = 0, unsigned endOffset = UINT_MAX, bool useSelectionHeight = false, bool* wasFixed = nullptr) const;
#if PLATFORM(IOS_FAMILY)
void collectSelectionGeometries(Vector<SelectionGeometry>&, unsigned startOffset = 0, unsigned endOffset = std::numeric_limits<unsigned>::max()) final;
#endif
void absoluteQuads(Vector<FloatQuad>&, bool* wasFixed) const final;
Vector<FloatQuad> absoluteQuadsForRange(unsigned startOffset = 0, unsigned endOffset = UINT_MAX, bool useSelectionHeight = false, bool ignoreEmptyTextSelections = false, bool* wasFixed = nullptr) const;
Vector<FloatQuad> absoluteQuadsClippedToEllipsis() const;
Position positionForPoint(const LayoutPoint&) final;
UChar characterAt(unsigned) const;
unsigned length() const final { return text().length(); }
void positionLineBox(LegacyInlineTextBox&);
virtual float width(unsigned from, unsigned length, const FontCascade&, float xPos, HashSet<const Font*>* fallbackFonts = nullptr, GlyphOverflow* = nullptr) const;
virtual float width(unsigned from, unsigned length, float xPos, bool firstLine = false, HashSet<const Font*>* fallbackFonts = nullptr, GlyphOverflow* = nullptr) const;
float minLogicalWidth() const;
float maxLogicalWidth() const;
struct Widths {
float min { 0 };
float max { 0 };
float beginMin { 0 };
float endMin { 0 };
float beginMax { 0 };
float endMax { 0 };
bool beginWS { false };
bool endWS { false };
bool hasBreakableChar { false };
bool hasBreak { false };
bool endsWithBreak { false };
};
Widths trimmedPreferredWidths(float leadWidth, bool& stripFrontSpaces);
float hangablePunctuationStartWidth(unsigned index) const;
float hangablePunctuationEndWidth(unsigned index) const;
unsigned firstCharacterIndexStrippingSpaces() const;
unsigned lastCharacterIndexStrippingSpaces() const;
static bool isHangableStopOrComma(UChar);
WEBCORE_EXPORT virtual IntRect linesBoundingBox() const;
WEBCORE_EXPORT IntPoint firstRunLocation() const;
virtual void setText(const String&, bool force = false);
void setTextWithOffset(const String&, unsigned offset, unsigned len, bool force = false);
bool canBeSelectionLeaf() const override { return true; }
LayoutRect collectSelectionGeometriesForLineBoxes(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent, Vector<FloatQuad>&);
LayoutUnit marginLeft() const { return minimumValueForLength(style().marginLeft(), 0); }
LayoutUnit marginRight() const { return minimumValueForLength(style().marginRight(), 0); }
LegacyInlineTextBox* firstTextBox() const { return m_lineBoxes.first(); }
LegacyInlineTextBox* lastTextBox() const { return m_lineBoxes.last(); }
int caretMinOffset() const final;
int caretMaxOffset() const final;
unsigned countRenderedCharacterOffsetsUntil(unsigned) const;
bool containsRenderedCharacterOffset(unsigned) const;
bool containsCaretOffset(unsigned) const;
bool hasRenderedText() const;
// FIXME: These should return unsigneds.
int previousOffset(int current) const final;
int previousOffsetForBackwardDeletion(int current) const final;
int nextOffset(int current) const final;
bool needsVisualReordering() const { return m_needsVisualReordering; }
void setNeedsVisualReordering() { m_needsVisualReordering = true; }
void momentarilyRevealLastTypedCharacter(unsigned offsetAfterLastTypedCharacter);
LegacyInlineTextBox* findNextInlineTextBox(int offset, int& pos) const { return m_lineBoxes.findNext(offset, pos); }
bool isAllCollapsibleWhitespace() const;
bool canUseSimpleFontCodePath() const { return m_canUseSimpleFontCodePath; }
void removeAndDestroyTextBoxes();
virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
virtual std::unique_ptr<LegacyInlineTextBox> createTextBox();
#if ENABLE(TEXT_AUTOSIZING)
float candidateComputedTextSize() const { return m_candidateComputedTextSize; }
void setCandidateComputedTextSize(float size) { m_candidateComputedTextSize = size; }
#endif
bool usesLegacyLineLayoutPath() const;
StringView stringView(unsigned start = 0, std::optional<unsigned> stop = std::nullopt) const;
bool containsOnlyHTMLWhitespace(unsigned from, unsigned length) const;
bool canUseSimplifiedTextMeasuring() const { return m_canUseSimplifiedTextMeasuring; }
Vector<std::pair<unsigned, unsigned>> draggedContentRangesBetweenOffsets(unsigned startOffset, unsigned endOffset) const;
RenderInline* inlineWrapperForDisplayContents();
void setInlineWrapperForDisplayContents(RenderInline*);
static RenderText* findByDisplayContentsInlineWrapperCandidate(RenderElement&);
template <typename MeasureTextCallback>
static float measureTextConsideringPossibleTrailingSpace(bool currentCharacterIsSpace, unsigned startIndex, unsigned wordLength, WordTrailingSpace&, HashSet<const Font*>& fallbackFonts, MeasureTextCallback&&);
protected:
virtual void computePreferredLogicalWidths(float leadWidth);
void willBeDestroyed() override;
virtual void setRenderedText(const String&);
virtual UChar previousCharacter() const;
RenderTextLineBoxes m_lineBoxes;
private:
RenderText(Node&, const String&);
const char* renderName() const override;
bool canHaveChildren() const final { return false; }
VisiblePosition positionForPoint(const LayoutPoint&, const RenderFragmentContainer*) override;
void setSelectionState(HighlightState) final;
LayoutRect selectionRectForRepaint(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent = true) final;
LayoutRect clippedOverflowRect(const RenderLayerModelObject* repaintContainer, VisibleRectContext) const final;
void computePreferredLogicalWidths(float leadWidth, HashSet<const Font*>& fallbackFonts, GlyphOverflow&);
bool computeCanUseSimpleFontCodePath() const;
bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation&, const LayoutPoint&, HitTestAction) final { ASSERT_NOT_REACHED(); return false; }
float widthFromCache(const FontCascade&, unsigned start, unsigned len, float xPos, HashSet<const Font*>* fallbackFonts, GlyphOverflow*, const RenderStyle&) const;
bool computeUseBackslashAsYenSymbol() const;
void secureText(UChar mask);
LayoutRect collectSelectionGeometriesForLineBoxes(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent, Vector<FloatQuad>*);
bool computeCanUseSimplifiedTextMeasuring() const;
void node() const = delete;
void container() const = delete; // Use parent() instead.
void container(const RenderLayerModelObject&, bool&) const = delete; // Use parent() instead.
float maxWordFragmentWidth(const RenderStyle&, const FontCascade&, StringView word, unsigned minimumPrefixLength, unsigned minimumSuffixLength, bool currentCharacterIsSpace, unsigned characterIndex, float xPos, float entireWordWidth, WordTrailingSpace&, HashSet<const Font*>& fallbackFonts, GlyphOverflow&);
float widthFromCacheConsideringPossibleTrailingSpace(const RenderStyle&, const FontCascade&, unsigned startIndex, unsigned wordLen, float xPos, bool currentCharacterIsSpace, WordTrailingSpace&, HashSet<const Font*>& fallbackFonts, GlyphOverflow&) const;
// We put the bitfield first to minimize padding on 64-bit.
unsigned m_hasBreakableChar : 1; // Whether or not we can be broken into multiple lines.
unsigned m_hasBreak : 1; // Whether or not we have a hard break (e.g., <pre> with '\n').
unsigned m_hasTab : 1; // Whether or not we have a variable width tab character (e.g., <pre> with '\t').
unsigned m_hasBeginWS : 1; // Whether or not we begin with WS (only true if we aren't pre)
unsigned m_hasEndWS : 1; // Whether or not we end with WS (only true if we aren't pre)
unsigned m_linesDirty : 1; // This bit indicates that the text run has already dirtied specific
// line boxes, and this hint will enable layoutInlineChildren to avoid
// just dirtying everything when character data is modified (e.g., appended/inserted
// or removed).
unsigned m_needsVisualReordering : 1;
unsigned m_isAllASCII : 1;
unsigned m_canUseSimpleFontCodePath : 1;
mutable unsigned m_knownToHaveNoOverflowAndNoFallbackFonts : 1;
unsigned m_useBackslashAsYenSymbol : 1;
unsigned m_originalTextDiffersFromRendered : 1;
unsigned m_hasInlineWrapperForDisplayContents : 1;
unsigned m_canUseSimplifiedTextMeasuring : 1;
#if ENABLE(TEXT_AUTOSIZING)
// FIXME: This should probably be part of the text sizing structures in Document instead. That would save some memory.
float m_candidateComputedTextSize { 0 };
#endif
float m_minWidth { -1 };
float m_maxWidth { -1 };
float m_beginMinWidth { 0 };
float m_endMinWidth { 0 };
String m_text;
};
String applyTextTransform(const RenderStyle&, const String&, UChar previousCharacter);
String capitalize(const String&, UChar previousCharacter);
LineBreakIteratorMode mapLineBreakToIteratorMode(LineBreak);
inline UChar RenderText::characterAt(unsigned i) const
{
return i >= length() ? 0 : text()[i];
}
inline const RenderStyle& RenderText::style() const
{
return parent()->style();
}
inline const RenderStyle& RenderText::firstLineStyle() const
{
return parent()->firstLineStyle();
}
inline const RenderStyle* RenderText::getCachedPseudoStyle(PseudoId pseudoId, const RenderStyle* parentStyle) const
{
// Pseudostyle is associated with an element, so ascend the tree until we find a non-anonymous ancestor.
if (auto* ancestor = firstNonAnonymousAncestor())
return ancestor->getCachedPseudoStyle(pseudoId, parentStyle);
return nullptr;
}
inline Color RenderText::selectionBackgroundColor() const
{
if (auto* ancestor = firstNonAnonymousAncestor())
return ancestor->selectionBackgroundColor();
return Color();
}
inline Color RenderText::selectionForegroundColor() const
{
if (auto* ancestor = firstNonAnonymousAncestor())
return ancestor->selectionForegroundColor();
return Color();
}
inline Color RenderText::selectionEmphasisMarkColor() const
{
if (auto* ancestor = firstNonAnonymousAncestor())
return ancestor->selectionEmphasisMarkColor();
return Color();
}
inline std::unique_ptr<RenderStyle> RenderText::selectionPseudoStyle() const
{
if (auto* ancestor = firstNonAnonymousAncestor())
return ancestor->selectionPseudoStyle();
return nullptr;
}
inline RenderText* Text::renderer() const
{
return downcast<RenderText>(Node::renderer());
}
} // namespace WebCore
SPECIALIZE_TYPE_TRAITS_RENDER_OBJECT(RenderText, isText())