/*

 * (C) 1999 Lars Knoll (knoll@kde.org)

 * (C) 2000 Dirk Mueller (mueller@kde.org)

 * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 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 RenderText_h

#define RenderText_h

#include "RenderObject.h"

namespace WebCore {

class InlineTextBox;

class StringImpl;

class RenderText : public RenderObject {

public:

    RenderText(Node*, PassRefPtr<StringImpl>);

#ifndef NDEBUG

    virtual ~RenderText();

#endif

    virtual const char* renderName() const;

    virtual bool isTextFragment() const;

    virtual bool isWordBreak() const;

    virtual PassRefPtr<StringImpl> originalText() const;

    void extractTextBox(InlineTextBox*);

    void attachTextBox(InlineTextBox*);

    void removeTextBox(InlineTextBox*);

    virtual void destroy();

    StringImpl* text() const { return m_text.impl(); }

    String textWithoutTranscoding() const;

    InlineTextBox* createInlineTextBox();

    void dirtyLineBoxes(bool fullLayout);

    virtual void absoluteRects(Vector<IntRect>&, int tx, int ty);

    void absoluteRectsForRange(Vector<IntRect>&, unsigned startOffset = 0, unsigned endOffset = UINT_MAX, bool useSelectionHeight = false);

    virtual void absoluteQuads(Vector<FloatQuad>&);

    void absoluteQuadsForRange(Vector<FloatQuad>&, unsigned startOffset = 0, unsigned endOffset = UINT_MAX, bool useSelectionHeight = false);

    virtual VisiblePosition positionForPoint(const IntPoint&);

    const UChar* characters() const { return m_text.characters(); }

    unsigned textLength() const { return m_text.length(); } // non virtual implementation of length()

    void positionLineBox(InlineBox*);

    virtual unsigned width(unsigned from, unsigned len, const Font&, int xPos, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const;

    virtual unsigned width(unsigned from, unsigned len, int xPos, bool firstLine = false, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const;

    virtual int lineHeight(bool firstLine, bool isRootLineBox = false) const;

    virtual int minPrefWidth() const;

    virtual int maxPrefWidth() const;

    void trimmedPrefWidths(int leadWidth,

                           int& beginMinW, bool& beginWS,

                           int& endMinW, bool& endWS,

                           bool& hasBreakableChar, bool& hasBreak,

                           int& beginMaxW, int& endMaxW,

                           int& minW, int& maxW, bool& stripFrontSpaces);

    IntRect linesBoundingBox() const;

    IntPoint firstRunOrigin() const;

    int firstRunX() const;

    int firstRunY() const;

    void setText(PassRefPtr<StringImpl>, bool force = false);

    void setTextWithOffset(PassRefPtr<StringImpl>, unsigned offset, unsigned len, bool force = false);

    virtual bool canBeSelectionLeaf() const { return true; }

    virtual void setSelectionState(SelectionState s);

    virtual IntRect selectionRectForRepaint(RenderBoxModelObject* repaintContainer, bool clipToVisibleContent = true);

    virtual IntRect localCaretRect(InlineBox*, int caretOffset, int* extraWidthToEndOfLine = 0);

    virtual int marginLeft() const { return style()->marginLeft().calcMinValue(0); }

    virtual int marginRight() const { return style()->marginRight().calcMinValue(0); }

    virtual IntRect clippedOverflowRectForRepaint(RenderBoxModelObject* repaintContainer);

    InlineTextBox* firstTextBox() const { return m_firstTextBox; }

    InlineTextBox* lastTextBox() const { return m_lastTextBox; }

    virtual int caretMinOffset() const;

    virtual int caretMaxOffset() const;

    virtual unsigned caretMaxRenderedOffset() const;

    virtual int previousOffset(int current) const;

    virtual int previousOffsetForBackwardDeletion(int current) const;

    virtual int nextOffset(int current) const;

    bool containsReversedText() const { return m_containsReversedText; }

    InlineTextBox* findNextInlineTextBox(int offset, int& pos) const;

    bool allowTabs() const { return !style()->collapseWhiteSpace(); }

    void checkConsistency() const;

    virtual void calcPrefWidths(int leadWidth);

    bool isAllCollapsibleWhitespace();

protected:

    virtual void styleWillChange(StyleDifference, const RenderStyle*) { }

    virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);

    virtual void setTextInternal(PassRefPtr<StringImpl>);

    virtual UChar previousCharacter() const;

    virtual InlineTextBox* createTextBox(); // Subclassed by SVG.

private:

    void calcPrefWidths(int leadWidth, HashSet<const SimpleFontData*>& fallbackFonts, GlyphOverflow&);

    // Make length() private so that callers that have a RenderText*

    // will use the more efficient textLength() instead, while

    // callers with a RenderObject* can continue to use length().

    virtual unsigned length() const { return textLength(); }

    virtual void paint(PaintInfo&, int, int) { ASSERT_NOT_REACHED(); }

    virtual void layout() { ASSERT_NOT_REACHED(); }

    virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, int, int, int, int, HitTestAction) { ASSERT_NOT_REACHED(); return false; }

    void deleteTextBoxes();

    bool containsOnlyWhitespace(unsigned from, unsigned len) const;

    int widthFromCache(const Font&, int start, int len, int xPos, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow*) const;

    bool isAllASCII() const { return m_isAllASCII; }

    void updateNeedsTranscoding();

    inline void transformText(String&) const;

    int m_minWidth; // here to minimize padding in 64-bit.

    String m_text;

    InlineTextBox* m_firstTextBox;

    InlineTextBox* m_lastTextBox;

    int m_maxWidth;

    int m_beginMinWidth;

    int m_endMinWidth;

    bool m_hasBreakableChar : 1; // Whether or not we can be broken into multiple lines.

    bool m_hasBreak : 1; // Whether or not we have a hard break (e.g., <pre> with '\n').

    bool m_hasTab : 1; // Whether or not we have a variable width tab character (e.g., <pre> with '\t').

    bool m_hasBeginWS : 1; // Whether or not we begin with WS (only true if we aren't pre)

    bool m_hasEndWS : 1; // Whether or not we end with WS (only true if we aren't pre)

    bool 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).

    bool m_containsReversedText : 1;

    bool m_isAllASCII : 1;

    mutable bool m_knownToHaveNoOverflowAndNoFallbackFonts : 1;

    bool m_needsTranscoding : 1;

};

inline RenderText* toRenderText(RenderObject* object)

{ 

    ASSERT(!object || object->isText());

    return static_cast<RenderText*>(object);

}

inline const RenderText* toRenderText(const RenderObject* object)

{ 

    ASSERT(!object || object->isText());

    return static_cast<const RenderText*>(object);

}

// This will catch anyone doing an unnecessary cast.

void toRenderText(const RenderText*);

#ifdef NDEBUG

inline void RenderText::checkConsistency() const

{

}

#endif

} // namespace WebCore

#endif // RenderText_h