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| 1 // Copyright 2017 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/dom/FormElementObserver.h" |
| 6 |
| 7 #include "core/css/CSSComputedStyleDeclaration.h" |
| 8 #include "core/dom/MutationCallback.h" |
| 9 #include "core/dom/MutationObserver.h" |
| 10 #include "core/dom/MutationObserverInit.h" |
| 11 #include "core/dom/MutationRecord.h" |
| 12 #include "core/dom/StaticNodeList.h" |
| 13 #include "core/html/HTMLElement.h" |
| 14 #include "core/html/HTMLFormElement.h" |
| 15 #include "core/html/HTMLInputElement.h" |
| 16 #include "public/web/WebElement.h" |
| 17 #include "public/web/WebFormElementObserverCallback.h" |
| 18 |
| 19 namespace blink { |
| 20 |
| 21 class FormElementObserver::ObserverCallback : public MutationCallback { |
| 22 public: |
| 23 explicit ObserverCallback(FormElementObserver&); |
| 24 DECLARE_VIRTUAL_TRACE(); |
| 25 |
| 26 ExecutionContext* GetExecutionContext() const override; |
| 27 |
| 28 void Register(HTMLElement&); |
| 29 void Dispose(); |
| 30 |
| 31 private: |
| 32 void Call(const HeapVector<Member<MutationRecord>>& records, |
| 33 MutationObserver*) override; |
| 34 |
| 35 Member<FormElementObserver> element_observer_; |
| 36 Member<MutationObserver> mutation_observer_; |
| 37 }; |
| 38 |
| 39 FormElementObserver::ObserverCallback::ObserverCallback( |
| 40 FormElementObserver& element_observer) |
| 41 : element_observer_(element_observer) { |
| 42 mutation_observer_ = MutationObserver::Create(this); |
| 43 } |
| 44 |
| 45 ExecutionContext* FormElementObserver::ObserverCallback::GetExecutionContext() |
| 46 const { |
| 47 return element_observer_->document_; |
| 48 } |
| 49 |
| 50 void FormElementObserver::ObserverCallback::Register(HTMLElement& element) { |
| 51 { |
| 52 Vector<String> filter; |
| 53 filter.ReserveCapacity(3); |
| 54 filter.push_back(String("action")); |
| 55 filter.push_back(String("class")); |
| 56 filter.push_back(String("style")); |
| 57 MutationObserverInit init; |
| 58 init.setAttributes(true); |
| 59 init.setAttributeFilter(filter); |
| 60 mutation_observer_->observe(&element, init, ASSERT_NO_EXCEPTION); |
| 61 } |
| 62 { |
| 63 MutationObserverInit init; |
| 64 init.setChildList(true); |
| 65 mutation_observer_->observe(element.parentElement(), init, |
| 66 ASSERT_NO_EXCEPTION); |
| 67 } |
| 68 } |
| 69 |
| 70 void FormElementObserver::ObserverCallback::Dispose() { |
| 71 mutation_observer_->disconnect(); |
| 72 } |
| 73 |
| 74 void FormElementObserver::ObserverCallback::Call( |
| 75 const HeapVector<Member<MutationRecord>>& records, |
| 76 MutationObserver*) { |
| 77 for (const auto& record : records) { |
| 78 if (record->type() == "childList") { |
| 79 for (unsigned i = 0; i < record->removedNodes()->length(); ++i) { |
| 80 if (!record->removedNodes()->item(i)->IsHTMLElement()) |
| 81 continue; |
| 82 element_observer_->NotifyMutation( |
| 83 *ToHTMLElement(record->removedNodes()->item(i))); |
| 84 } |
| 85 } else { |
| 86 HTMLElement& element = *ToHTMLElement(record->target()); |
| 87 if (record->attributeName() == "action") { |
| 88 // If the action was modified, we just assume that the form as |
| 89 // submitted. |
| 90 element_observer_->NotifyMutation(element); |
| 91 } else { |
| 92 // Otherwise, either "style" or "class" was modified. Check the |
| 93 // computed style. |
| 94 CSSComputedStyleDeclaration* style = |
| 95 CSSComputedStyleDeclaration::Create(&element); |
| 96 if (style->GetPropertyValue(CSSPropertyDisplay) == "none") |
| 97 element_observer_->NotifyMutation(element); |
| 98 } |
| 99 } |
| 100 } |
| 101 } |
| 102 |
| 103 DEFINE_TRACE(FormElementObserver::ObserverCallback) { |
| 104 visitor->Trace(element_observer_); |
| 105 visitor->Trace(mutation_observer_); |
| 106 MutationCallback::Trace(visitor); |
| 107 } |
| 108 |
| 109 FormElementObserver::FormElementObserver(Document& document) |
| 110 : document_(&document) {} |
| 111 |
| 112 FormElementObserver::~FormElementObserver() {} |
| 113 |
| 114 void FormElementObserver::EnsureObserver() { |
| 115 if (!callback_) |
| 116 callback_ = new ObserverCallback(*this); |
| 117 } |
| 118 |
| 119 void FormElementObserver::ClearObserver() { |
| 120 if (callback_) { |
| 121 callback_->Dispose(); |
| 122 callback_ = nullptr; |
| 123 } |
| 124 } |
| 125 |
| 126 void FormElementObserver::Observe( |
| 127 HTMLFormElement& element, |
| 128 std::unique_ptr<WebFormElementObserverCallback> callback) { |
| 129 ObserveInternal(element, std::move(callback)); |
| 130 } |
| 131 |
| 132 void FormElementObserver::Observe( |
| 133 HTMLInputElement& element, |
| 134 std::unique_ptr<WebFormElementObserverCallback> callback) { |
| 135 ObserveInternal(element, std::move(callback)); |
| 136 } |
| 137 |
| 138 void FormElementObserver::ObserveInternal( |
| 139 HTMLElement& element, |
| 140 std::unique_ptr<WebFormElementObserverCallback> callback) { |
| 141 DCHECK(element.parentElement()); |
| 142 CHECK(callbacks_.Set(&element, std::move(callback)).is_new_entry); |
| 143 EnsureObserver(); |
| 144 callback_->Register(element); |
| 145 } |
| 146 |
| 147 void FormElementObserver::NotifyMutation(HTMLElement& element) { |
| 148 if (!callbacks_.Contains(&element)) |
| 149 return; |
| 150 auto it = callbacks_.find(&element); |
| 151 it->value->ElementWasHiddenOrRemoved(); |
| 152 callbacks_.erase(it); |
| 153 if (callbacks_.IsEmpty()) |
| 154 ClearObserver(); |
| 155 } |
| 156 |
| 157 DEFINE_TRACE(FormElementObserver) { |
| 158 visitor->Trace(document_); |
| 159 visitor->Trace(callback_); |
| 160 visitor->Trace(mutation_observer_); |
| 161 visitor->Trace(callbacks_); |
| 162 } |
| 163 |
| 164 } // namespace blink |
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