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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 blink {
     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)
     53     {
     54         return adoptRef(new SVGPathSegList(contextElement));
     55     }
     56     static PassRefPtr<SVGPathSegList> create() { ASSERT_NOT_REACHED(); return nullptr; }
     57 
     58     virtual ~SVGPathSegList();
     59 
     60     const SVGPathByteStream* byteStream() const;
     61     void clearByteStream() { m_byteStream.clear(); }
     62 
     63     // SVGListPropertyHelper methods with |m_byteStream| sync:
     64 
     65     ItemPropertyType* at(size_t index)
     66     {
     67         updateListFromByteStream();
     68         return Base::at(index);
     69     }
     70 
     71     size_t length()
     72     {
     73         updateListFromByteStream();
     74         return Base::length();
     75     }
     76 
     77     bool isEmpty() const
     78     {
     79         if (m_listSyncedToByteStream)
     80             return Base::isEmpty();
     81 
     82         return !m_byteStream || m_byteStream->isEmpty();
     83     }
     84 
     85     void clear()
     86     {
     87         clearByteStream();
     88         Base::clear();
     89     }
     90 
     91     void append(PassRefPtr<ItemPropertyType> passNewItem)
     92     {
     93         updateListFromByteStream();
     94         clearByteStream();
     95         Base::append(passNewItem);
     96     }
     97 
     98     PassRefPtr<ItemPropertyType> initialize(PassRefPtr<ItemPropertyType> passItem)
     99     {
    100         clearByteStream();
    101         return Base::initialize(passItem);
    102     }
    103 
    104     PassRefPtr<ItemPropertyType> getItem(size_t index, ExceptionState& exceptionState)
    105     {
    106         updateListFromByteStream();
    107         return Base::getItem(index, exceptionState);
    108     }
    109 
    110     PassRefPtr<ItemPropertyType> insertItemBefore(PassRefPtr<ItemPropertyType> passItem, size_t index)
    111     {
    112         updateListFromByteStream();
    113         clearByteStream();
    114         return Base::insertItemBefore(passItem, index);
    115     }
    116 
    117     PassRefPtr<ItemPropertyType> replaceItem(PassRefPtr<ItemPropertyType> passItem, size_t index, ExceptionState& exceptionState)
    118     {
    119         updateListFromByteStream();
    120         clearByteStream();
    121         return Base::replaceItem(passItem, index, exceptionState);
    122     }
    123 
    124     PassRefPtr<ItemPropertyType> removeItem(size_t index, ExceptionState& exceptionState)
    125     {
    126         updateListFromByteStream();
    127         clearByteStream();
    128         return Base::removeItem(index, exceptionState);
    129     }
    130 
    131     PassRefPtr<ItemPropertyType> appendItem(PassRefPtr<ItemPropertyType> passItem);
    132 
    133     // SVGPropertyBase:
    134     virtual PassRefPtr<SVGPropertyBase> cloneForAnimation(const String&) const OVERRIDE;
    135     virtual PassRefPtr<SVGPathSegList> clone() OVERRIDE;
    136     virtual String valueAsString() const OVERRIDE;
    137     void setValueAsString(const String&, ExceptionState&);
    138 
    139     virtual void add(PassRefPtrWillBeRawPtr<SVGPropertyBase>, SVGElement*) OVERRIDE;
    140     virtual void calculateAnimatedValue(SVGAnimationElement*, float percentage, unsigned repeatCount, PassRefPtr<SVGPropertyBase> fromValue, PassRefPtr<SVGPropertyBase> toValue, PassRefPtr<SVGPropertyBase> toAtEndOfDurationValue, SVGElement*) OVERRIDE;
    141     virtual float calculateDistance(PassRefPtr<SVGPropertyBase> to, SVGElement*) OVERRIDE;
    142 
    143     static AnimatedPropertyType classType() { return AnimatedPath; }
    144 
    145 private:
    146     SVGPathSegList(SVGPathElement*);
    147     SVGPathSegList(SVGPathElement*, PassOwnPtr<SVGPathByteStream>);
    148 
    149     friend class SVGPathSegListBuilder;
    150     // This is only to be called from SVGPathSegListBuilder.
    151     void appendWithoutByteStreamSync(PassRefPtr<ItemPropertyType> passNewItem)
    152     {
    153         Base::append(passNewItem);
    154     }
    155 
    156     void updateListFromByteStream();
    157     void invalidateList();
    158 
    159     // FIXME: This pointer should be removed after SVGPathSeg has a tear-off.
    160     // FIXME: oilpan: This is raw-ptr to avoid reference cycles.
    161     //        SVGPathSegList is either owned by SVGAnimatedPath or
    162     //        SVGPathSegListTearOff. Both keep |contextElement| alive,
    163     //        so this ptr is always valid.
    164     SVGPathElement* m_contextElement;
    165 
    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 blink
    178 
    179 #endif
    180