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      1 /*
      2  * Copyright (C) 2014 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef SVGPathSegList_h
     32 #define SVGPathSegList_h
     33 
     34 #include "core/svg/SVGPathByteStream.h"
     35 #include "core/svg/SVGPathSeg.h"
     36 #include "core/svg/properties/SVGAnimatedProperty.h"
     37 #include "core/svg/properties/SVGListPropertyHelper.h"
     38 #include "wtf/WeakPtr.h"
     39 
     40 namespace WebCore {
     41 
     42 class SVGPathElement;
     43 class SVGPathSegListTearOff;
     44 
     45 class SVGPathSegList : public SVGListPropertyHelper<SVGPathSegList, SVGPathSeg> {
     46 public:
     47     typedef void PrimitiveType;
     48     typedef SVGPathSeg ItemPropertyType;
     49     typedef SVGPathSegListTearOff TearOffType;
     50     typedef SVGListPropertyHelper<SVGPathSegList, SVGPathSeg> Base;
     51 
     52     static PassRefPtr<SVGPathSegList> create(SVGPathElement* contextElement, SVGPathSegRole role = PathSegUndefinedRole)
     53     {
     54         return adoptRef(new SVGPathSegList(contextElement, role));
     55     }
     56 
     57     virtual ~SVGPathSegList();
     58 
     59     const SVGPathByteStream* byteStream() const;
     60     void clearByteStream() { m_byteStream.clear(); }
     61 
     62     // SVGListPropertyHelper methods with |m_byteStream| sync:
     63 
     64     ItemPropertyType* at(size_t index)
     65     {
     66         updateListFromByteStream();
     67         return Base::at(index);
     68     }
     69 
     70     size_t length()
     71     {
     72         updateListFromByteStream();
     73         return Base::length();
     74     }
     75 
     76     bool isEmpty() const
     77     {
     78         if (m_listSyncedToByteStream)
     79             return Base::isEmpty();
     80 
     81         return !m_byteStream || m_byteStream->isEmpty();
     82     }
     83 
     84     void clear()
     85     {
     86         clearByteStream();
     87         Base::clear();
     88     }
     89 
     90     void append(PassRefPtr<ItemPropertyType> passNewItem)
     91     {
     92         updateListFromByteStream();
     93         clearByteStream();
     94         Base::append(passNewItem);
     95     }
     96 
     97     PassRefPtr<ItemPropertyType> initialize(PassRefPtr<ItemPropertyType> passItem)
     98     {
     99         clearByteStream();
    100         return Base::initialize(passItem);
    101     }
    102 
    103     PassRefPtr<ItemPropertyType> getItem(size_t index, ExceptionState& exceptionState)
    104     {
    105         updateListFromByteStream();
    106         return Base::getItem(index, exceptionState);
    107     }
    108 
    109     PassRefPtr<ItemPropertyType> insertItemBefore(PassRefPtr<ItemPropertyType> passItem, size_t index)
    110     {
    111         updateListFromByteStream();
    112         clearByteStream();
    113         return Base::insertItemBefore(passItem, index);
    114     }
    115 
    116     PassRefPtr<ItemPropertyType> replaceItem(PassRefPtr<ItemPropertyType> passItem, size_t index, ExceptionState& exceptionState)
    117     {
    118         updateListFromByteStream();
    119         clearByteStream();
    120         return Base::replaceItem(passItem, index, exceptionState);
    121     }
    122 
    123     PassRefPtr<ItemPropertyType> removeItem(size_t index, ExceptionState& exceptionState)
    124     {
    125         updateListFromByteStream();
    126         clearByteStream();
    127         return Base::removeItem(index, exceptionState);
    128     }
    129 
    130     PassRefPtr<ItemPropertyType> appendItem(PassRefPtr<ItemPropertyType> passItem);
    131 
    132     // SVGPropertyBase:
    133     PassRefPtr<SVGPathSegList> clone();
    134     virtual PassRefPtr<SVGPropertyBase> cloneForAnimation(const String&) const OVERRIDE;
    135     virtual String valueAsString() const OVERRIDE;
    136     void setValueAsString(const String&, ExceptionState&);
    137 
    138     virtual void add(PassRefPtrWillBeRawPtr<SVGPropertyBase>, SVGElement*) OVERRIDE;
    139     virtual void calculateAnimatedValue(SVGAnimationElement*, float percentage, unsigned repeatCount, PassRefPtr<SVGPropertyBase> fromValue, PassRefPtr<SVGPropertyBase> toValue, PassRefPtr<SVGPropertyBase> toAtEndOfDurationValue, SVGElement*) OVERRIDE;
    140     virtual float calculateDistance(PassRefPtr<SVGPropertyBase> to, SVGElement*) OVERRIDE;
    141 
    142     static AnimatedPropertyType classType() { return AnimatedPath; }
    143 
    144 private:
    145     SVGPathSegList(SVGPathElement*, SVGPathSegRole);
    146     SVGPathSegList(SVGPathElement*, SVGPathSegRole, PassOwnPtr<SVGPathByteStream>);
    147 
    148     friend class SVGPathSegListBuilder;
    149     // This is only to be called from SVGPathSegListBuilder.
    150     void appendWithoutByteStreamSync(PassRefPtr<ItemPropertyType> passNewItem)
    151     {
    152         Base::append(passNewItem);
    153     }
    154 
    155     void updateListFromByteStream();
    156     void invalidateList();
    157 
    158     // FIXME: This pointer should be removed after SVGPathSeg has a tear-off.
    159     // FIXME: oilpan: This is raw-ptr to avoid reference cycles.
    160     //        SVGPathSegList is either owned by SVGAnimatedPath or
    161     //        SVGPathSegListTearOff. Both keep |contextElement| alive,
    162     //        so this ptr is always valid.
    163     SVGPathElement* m_contextElement;
    164 
    165     SVGPathSegRole m_role;
    166     mutable OwnPtr<SVGPathByteStream> m_byteStream;
    167     bool m_listSyncedToByteStream;
    168 };
    169 
    170 inline PassRefPtr<SVGPathSegList> toSVGPathSegList(PassRefPtr<SVGPropertyBase> passBase)
    171 {
    172     RefPtr<SVGPropertyBase> base = passBase;
    173     ASSERT(base->type() == SVGPathSegList::classType());
    174     return static_pointer_cast<SVGPathSegList>(base.release());
    175 }
    176 
    177 } // namespace WebCore
    178 
    179 #endif
    180