svgnode.hxx

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
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 */
 
#pragma once
 
#include "SvgNumber.hxx"
#include "svgtoken.hxx"
#include <com/sun/star/xml/sax/XAttributeList.hpp>
#include <drawinglayer/primitive2d/Primitive2DContainer.hxx>
#include <memory>
#include <string_view>
#include <vector>
#include <optional>
 
// predefines
namespace svgio::svgreader
{
    class SvgNode;
    class SvgDocument;
    class SvgStyleAttributes;
}
 
 
 
namespace svgio::svgreader
    {
        enum class XmlSpace
        {
            NotSet,
            Default,
            Preserve
        };
 
        // display property (see SVG 1.1. 11.5), not inheritable
        enum class Display // #i121656#
        {
            Inline, // the default
            Block,
            ListItem,
            RunIn,
            Compact,
            Marker,
            Table,
            InlineTable,
            TableRowGroup,
            TableHeaderGroup,
            TableFooterGroup,
            TableRow,
            TableColumnGroup,
            TableColumn,
            TableCell,
            TableCaption,
            None,
            Inherit
        };
 
        // helper to convert a string associated with a token of type SVGTokenDisplay
        // to the enum Display. Empty strings return the default 'Display_inline' with
        // which members should be initialized
        Display getDisplayFromContent(std::u16string_view aContent);
 
      class Visitor;
 
        class SvgNode : public InfoProvider
        {
        private:
            SVGToken                    maType;
            SvgDocument&                mrDocument;
            const SvgNode*              mpParent;
            const SvgNode*              mpAlternativeParent;
 
            std::vector< std::unique_ptr<SvgNode> >  maChildren;
 
            std::optional<OUString>   mpId;
 
            std::optional<OUString>   mpClass;
 
            XmlSpace                    maXmlSpace;
 
            Display                     maDisplay;
 
            // CSS style vector chain, used in decompose phase and built up once per node.
            // It contains the StyleHierarchy for the local node. Independent from the
            // node hierarchy itself which also needs to be used in style entry solving
            ::std::vector< const SvgStyleAttributes* > maCssStyleVector;
 
            std::unique_ptr<SvgStyleAttributes>        mpLocalCssStyle;
 
            mutable bool                mbDecomposing;
 
            // flag if maCssStyleVector is already computed (done only once)
            bool                        mbCssStyleVectorBuilt : 1;
 
        protected:
            const SvgStyleAttributes* checkForCssStyle(const SvgStyleAttributes& rOriginal) const;
 
            void fillCssStyleVector(const SvgStyleAttributes& rOriginal);
            void addCssStyle(
                const SvgDocument& rDocument,
                const OUString& aConcatenated);
            void fillCssStyleVectorUsingHierarchyAndSelectors(
                const SvgNode& rCurrent,
                const OUString& aConcatenated);
            void fillCssStyleVectorUsingParent(
                const SvgNode& rCurrent);
 
        public:
            SvgNode(
                SVGToken aType,
                SvgDocument& rDocument,
                SvgNode* pParent);
            virtual ~SvgNode() override;
            SvgNode(const SvgNode&) = delete;
            SvgNode& operator=(const SvgNode&) = delete;
 
            void accept(Visitor& rVisitor);
 
            void readLocalCssStyle(std::u16string_view aContent);
 
            void parseAttributes(const css::uno::Reference< css::xml::sax::XAttributeList >& xAttribs);
            virtual const SvgStyleAttributes* getSvgStyleAttributes() const;
            virtual void parseAttribute(const OUString& rTokenName, SVGToken aSVGToken, const OUString& aContent);
            virtual void decomposeSvgNode(drawinglayer::primitive2d::Primitive2DContainer& rTarget, bool bReferenced) const;
 
            virtual bool supportsParentStyle() const;
 
            SVGToken getType() const { return maType; }
            const SvgDocument& getDocument() const { return mrDocument; }
            const SvgNode* getParent() const { if(mpAlternativeParent) return mpAlternativeParent; return mpParent; }
            const std::vector< std::unique_ptr<SvgNode> > & getChildren() const { return maChildren; }
 
            virtual basegfx::B2DRange getCurrentViewPort() const override;
            virtual double getCurrentFontSizeInherited() const override;
            virtual double getCurrentXHeightInherited() const override;
 
            double getCurrentFontSize() const;
            double getCurrentXHeight() const;
 
            std::optional<OUString> const & getId() const { return mpId; }
            void setId(OUString const &);
 
            std::optional<OUString> const & getClass() const { return mpClass; }
            void setClass(OUString const &);
 
            XmlSpace getXmlSpace() const;
            void setXmlSpace(XmlSpace eXmlSpace) { maXmlSpace = eXmlSpace; }
 
            Display getDisplay() const { return maDisplay; }
            void setDisplay(Display eDisplay) { maDisplay = eDisplay; }
 
            void setAlternativeParent(const SvgNode* pAlternativeParent = nullptr) { mpAlternativeParent = pAlternativeParent; }
 
            bool hasLocalCssStyle() { return static_cast<bool>(mpLocalCssStyle); }
        };
 
      class Visitor
      {
      public:
            virtual ~Visitor() = default;
            virtual void visit(SvgNode const & pNode) = 0;
      };
 
} // end of namespace svgio::svgreader
 
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