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| 1 // Copyright 2016 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "core/svg/SVGElementProxy.h" | |
| 6 | |
| 7 #include "core/dom/IdTargetObserver.h" | |
| 8 #include "core/fetch/FetchInitiatorTypeNames.h" | |
| 9 #include "core/fetch/FetchRequest.h" | |
| 10 #include "core/fetch/ResourceFetcher.h" | |
| 11 #include "core/svg/SVGElement.h" | |
| 12 #include "core/svg/SVGFilterElement.h" | |
| 13 #include "core/svg/SVGResourceClient.h" | |
| 14 | |
| 15 namespace blink { | |
| 16 | |
| 17 class SVGElementProxy::IdObserver : public IdTargetObserver { | |
| 18 public: | |
| 19 IdObserver(TreeScope& treeScope, SVGElementProxy& proxy) | |
| 20 : IdTargetObserver(treeScope.idTargetObserverRegistry(), proxy.id()), | |
| 21 m_treeScope(&treeScope) {} | |
| 22 | |
| 23 void addClient(SVGResourceClient* client) { m_clients.add(client); } | |
| 24 bool removeClient(SVGResourceClient* client) { | |
| 25 return m_clients.remove(client); | |
| 26 } | |
| 27 | |
| 28 TreeScope* treeScope() const { return m_treeScope; } | |
| 29 void transferClients(IdObserver& observer) { | |
| 30 for (const auto& client : m_clients) | |
| 31 observer.m_clients.add(client.key, client.value); | |
| 32 m_clients.clear(); | |
| 33 } | |
| 34 | |
| 35 DEFINE_INLINE_VIRTUAL_TRACE() { | |
| 36 visitor->trace(m_clients); | |
| 37 visitor->trace(m_treeScope); | |
| 38 IdTargetObserver::trace(visitor); | |
| 39 } | |
| 40 | |
| 41 void contentChanged() { | |
| 42 DCHECK(lifecycle().state() <= DocumentLifecycle::CompositingClean || | |
| 43 lifecycle().state() >= DocumentLifecycle::PaintClean); | |
| 44 HeapVector<Member<SVGResourceClient>> clients; | |
| 45 copyToVector(m_clients, clients); | |
| 46 for (SVGResourceClient* client : clients) | |
| 47 client->resourceContentChanged(); | |
| 48 } | |
| 49 | |
| 50 private: | |
| 51 const DocumentLifecycle& lifecycle() const { | |
| 52 return m_treeScope->document().lifecycle(); | |
| 53 } | |
| 54 void idTargetChanged() override { | |
| 55 DCHECK(lifecycle().stateAllowsTreeMutations()); | |
| 56 HeapVector<Member<SVGResourceClient>> clients; | |
| 57 copyToVector(m_clients, clients); | |
| 58 for (SVGResourceClient* client : clients) | |
| 59 client->resourceElementChanged(); | |
| 60 } | |
| 61 HeapHashCountedSet<Member<SVGResourceClient>> m_clients; | |
| 62 Member<TreeScope> m_treeScope; | |
| 63 }; | |
| 64 | |
| 65 SVGElementProxy::SVGElementProxy(const AtomicString& id) | |
| 66 : m_id(id), m_isLocal(true) {} | |
| 67 | |
| 68 SVGElementProxy::SVGElementProxy(const String& url, const AtomicString& id) | |
| 69 : m_id(id), m_url(url), m_isLocal(false) {} | |
| 70 | |
| 71 SVGElementProxy::~SVGElementProxy() {} | |
| 72 | |
| 73 void SVGElementProxy::addClient(SVGResourceClient* client) { | |
| 74 // An empty id will never be a valid element reference. | |
| 75 if (m_id.isEmpty()) | |
| 76 return; | |
| 77 if (m_document) { | |
| 78 m_document->addClient(client); | |
| 79 return; | |
| 80 } | |
| 81 TreeScope* clientScope = client->treeScope(); | |
| 82 TreeScope* lookupScope = | |
| 83 clientScope ? treeScopeForLookup(*clientScope) : nullptr; | |
| 84 if (!lookupScope) | |
| 85 return; | |
| 86 // Ensure sure we have an observer registered for this tree scope. | |
| 87 auto& scopeObserver = | |
| 88 m_observers.add(lookupScope, nullptr).storedValue->value; | |
| 89 if (!scopeObserver) | |
| 90 scopeObserver = new IdObserver(*lookupScope, *this); | |
| 91 | |
| 92 auto& observer = m_clients.add(client, nullptr).storedValue->value; | |
| 93 if (!observer) | |
| 94 observer = scopeObserver; | |
| 95 | |
| 96 DCHECK(observer && scopeObserver); | |
| 97 | |
| 98 // If the client moved to a different scope, we need to unregister the old | |
| 99 // observer and transfer any clients from it before replacing it. Thus any | |
| 100 // clients that remain to be removed will be transferred to the new observer, | |
| 101 // and hence removed from it instead. | |
| 102 if (observer != scopeObserver) { | |
| 103 observer->unregister(); | |
| 104 observer->transferClients(*scopeObserver); | |
| 105 observer = scopeObserver; | |
| 106 } | |
| 107 observer->addClient(client); | |
| 108 } | |
| 109 | |
| 110 void SVGElementProxy::removeClient(SVGResourceClient* client) { | |
| 111 // An empty id will never be a valid element reference. | |
| 112 if (m_id.isEmpty()) | |
| 113 return; | |
| 114 if (m_document) { | |
| 115 m_document->removeClient(client); | |
| 116 return; | |
| 117 } | |
| 118 auto entry = m_clients.find(client); | |
| 119 if (entry == m_clients.end()) | |
| 120 return; | |
| 121 IdObserver* observer = entry->value; | |
| 122 DCHECK(observer); | |
| 123 // If the client is not the last client in the scope, then no further action | |
| 124 // needs to be taken. | |
| 125 if (!observer->removeClient(client)) | |
| 126 return; | |
| 127 // Unregister and drop the scope association, then drop the client. | |
| 128 observer->unregister(); | |
| 129 m_observers.remove(observer->treeScope()); | |
| 130 m_clients.remove(entry); | |
| 131 } | |
| 132 | |
| 133 void SVGElementProxy::resolve(Document& document) { | |
| 134 if (m_isLocal || m_id.isEmpty() || m_url.isEmpty()) | |
| 135 return; | |
| 136 FetchRequest request(ResourceRequest(m_url), FetchInitiatorTypeNames::css); | |
| 137 m_document = DocumentResource::fetchSVGDocument(request, document.fetcher()); | |
| 138 m_url = String(); | |
| 139 } | |
| 140 | |
| 141 TreeScope* SVGElementProxy::treeScopeForLookup(TreeScope& treeScope) const { | |
| 142 if (m_isLocal) | |
| 143 return &treeScope; | |
| 144 if (!m_document) | |
| 145 return nullptr; | |
| 146 return m_document->document(); | |
| 147 } | |
| 148 | |
| 149 SVGElement* SVGElementProxy::findElement(TreeScope& treeScope) { | |
| 150 // An empty id will never be a valid element reference. | |
| 151 if (m_id.isEmpty()) | |
| 152 return nullptr; | |
| 153 TreeScope* lookupScope = treeScopeForLookup(treeScope); | |
| 154 if (!lookupScope) | |
| 155 return nullptr; | |
| 156 if (Element* targetElement = lookupScope->getElementById(m_id)) { | |
| 157 if (isSVGFilterElement(*targetElement)) { | |
| 158 toSVGFilterElement(*targetElement).elementProxySet().add(*this); | |
| 159 return toSVGElement(targetElement); | |
| 160 } | |
| 161 } | |
| 162 return nullptr; | |
| 163 } | |
| 164 | |
| 165 void SVGElementProxy::contentChanged(TreeScope& treeScope) { | |
| 166 if (auto* observer = m_observers.get(&treeScope)) | |
| 167 observer->contentChanged(); | |
| 168 } | |
| 169 | |
| 170 DEFINE_TRACE(SVGElementProxy) { | |
| 171 visitor->trace(m_clients); | |
| 172 visitor->trace(m_observers); | |
| 173 visitor->trace(m_document); | |
| 174 } | |
| 175 | |
| 176 void SVGElementProxySet::add(SVGElementProxy& elementProxy) { | |
| 177 m_elementProxies.add(&elementProxy); | |
| 178 } | |
| 179 | |
| 180 bool SVGElementProxySet::isEmpty() const { | |
| 181 return m_elementProxies.isEmpty(); | |
| 182 } | |
| 183 | |
| 184 void SVGElementProxySet::notifyContentChanged(TreeScope& treeScope) { | |
| 185 for (SVGElementProxy* proxy : m_elementProxies) | |
| 186 proxy->contentChanged(treeScope); | |
| 187 } | |
| 188 | |
| 189 DEFINE_TRACE(SVGElementProxySet) { | |
| 190 visitor->trace(m_elementProxies); | |
| 191 } | |
| 192 | |
| 193 } // namespace blink | |
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Chromium Code Reviews
Issue 2482353002:
Revert of Tracking filter mutation via SVGElementProxy (Closed)
