feat(dom): complete IntersectionObserver API

bridge/CMakeLists.txt

@@ -45,14 +45,14 @@ if(CMAKE_SYSTEM_NAME MATCHES "MSYS" OR MINGW)
 # set(CMAKE_LINKER lld)
 # set(CMAKE_AR llvm-ar)
 # set(CMAKE_RANLIB llvm-ranlib)
- 
+
  # Set C++20 standard for MSYS2 with libc++
  set(CMAKE_CXX_STANDARD 20)
  set(CMAKE_CXX_STANDARD_REQUIRED ON)
  set(CMAKE_CXX_EXTENSIONS OFF)
  add_compile_options(-stdlib=libc++)
  add_link_options(-stdlib=libc++)
- 
+
  # Define math constants that are not in standard C++
  add_compile_definitions(_USE_MATH_DEFINES)
 
@@ -108,14 +108,14 @@ if (${CMAKE_SYSTEM_NAME} STREQUAL "Linux")
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++")
  set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -stdlib=libc++ -static-libgcc")
  set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -stdlib=libc++ -static-libgcc")
- 
+
  # Ensure we're using clang/clang++ for libc++ support
  if (NOT CMAKE_CXX_COMPILER_ID MATCHES "Clang")
  message(WARNING "Using libc++ requires Clang compiler. Current compiler: ${CMAKE_CXX_COMPILER_ID}")
  endif()
- 
+
  message(STATUS "Using static libc++ for Linux build")
- 
+
  # STATIC_QUICKJS is set via build script (-DSTATIC_QUICKJS=true)
 endif ()
 

bridge/bindings/qjs/binding_initializer.cc

@@ -105,6 +105,8 @@
 #include "qjs_image.h"
 #include "qjs_input_event.h"
 #include "qjs_intersection_change_event.h"
+#include "qjs_intersection_observer.h"
+#include "qjs_intersection_observer_entry.h"
 #include "qjs_keyboard_event.h"
 #include "qjs_computed_css_style_declaration.h"
 #include "qjs_css_style_declaration.h"
@@ -315,6 +317,10 @@ void InstallBindings(ExecutingContext* context) {
  QJSSVGLineElement::Install(context);
  QJSNativeLoader::Install(context);
 
+ // IntersectionObserver
+ QJSIntersectionObserver::Install(context);
+ QJSIntersectionObserverEntry::Install(context);
+
  // Legacy bindings, not standard.
  QJSElementAttributes::Install(context);
  QJSLegacyCssStyleDeclaration::Install(context);

bridge/bindings/qjs/generated_code_helper.h

@@ -13,5 +13,6 @@
 #include "bindings/qjs/dictionary_base.h"
 #include "bindings/qjs/qjs_interface_bridge.h"
 #include "script_value.h"
+#include "qjs_union_double_sequencedouble.h"
 
 #endif

bridge/bindings/qjs/wrapper_type_info.h

@@ -192,6 +192,10 @@ enum {
  JS_CLASS_FORM_DATA,
  JS_CLASS_FILE,
 
+ // IntersectionObserver
+ JS_CLASS_INTERSECTION_OBSERVER,
+ JS_CLASS_INTERSECTION_OBSERVER_ENTRY,
+
  JS_CLASS_CUSTOM_CLASS_INIT_COUNT /* last entry for predefined classes */
 };
 

bridge/bridge_sources.json5

@@ -420,6 +420,8 @@
  "core/dom/dom_token_list.cc",
  "core/dom/dom_string_map.cc",
  "core/dom/names_map.cc",
+ "core/dom/intersection_observer.cc",
+ "core/dom/intersection_observer_entry.cc",
  "core/dom/element_rare_data_vector.cc",
  "core/dom/space_split_string.cc",
  "core/dom/scripted_animation_controller.cc",
@@ -739,6 +741,9 @@
  "code_gen/qjs_dom_point_init.cc",
  "code_gen/qjs_dom_point.cc",
  "code_gen/qjs_dom_point_read_only.cc",
+ "code_gen/qjs_intersection_observer.cc",
+ "code_gen/qjs_intersection_observer_entry.cc",
+ "code_gen/qjs_intersection_observer_init.cc",
  "code_gen/qjs_union_double_sequencedouble.cc",
  "code_gen/qjs_unionhtml_image_elementhtml_canvas_element.cc",
  "code_gen/qjs_union_dom_stringcanvas_gradientcanvas_pattern.cc",

bridge/core/binding_object.cc

@@ -67,7 +67,7 @@ void NativeBindingObject::HandleCallFromDartSide(const DartIsolateContext* dart_
  return;
 
  const AtomicString method =
-  AtomicString(std::unique_ptr<AutoFreeNativeString>(static_cast<AutoFreeNativeString*>(native_method->u.ptr)));
+ native_method != nullptr ? AtomicString(std::unique_ptr<AutoFreeNativeString>(static_cast<AutoFreeNativeString*>(native_method->u.ptr))) : AtomicString::Empty();
  const NativeValue result = binding_object->binding_target_->HandleCallFromDartSide(method, argc, argv, dart_object);
 
  auto* return_value = new NativeValue();

bridge/core/binding_object.h

@@ -76,7 +76,8 @@ enum CreateBindingObjectType {
  kCreateDOMMatrix = 0,
  kCreatePath2D = 1,
  kCreateDOMPoint = 2,
- kCreateFormData = 3
+ kCreateFormData = 3,
+ kCreateIntersectionObserver = 4,
 };
 
 struct BindingObjectPromiseContext : public DartReadable {

bridge/core/dom/document.cc

@@ -11,6 +11,7 @@
 #include "core/dom/comment.h"
 #include "core/dom/document_fragment.h"
 #include "core/dom/element.h"
+#include "core/dom/intersection_observer.h"
 #include "core/dom/events/event_target.h"
 #include "core/dom/text.h"
 #include "core/frame/window.h"
@@ -556,9 +557,29 @@ std::shared_ptr<EventListener> Document::GetWindowAttributeEventListener(const A
  return window->GetAttributeEventListener(event_type);
 }
 
+void Document::RegisterIntersectionObserver(IntersectionObserver* observer) {
+ if (observer == nullptr)
+ return;
+ intersection_observers_.insert(observer);
+}
+
+void Document::UnregisterIntersectionObserver(IntersectionObserver* observer) {
+ if (observer == nullptr)
+ return;
+ for (auto it = intersection_observers_.begin(); it != intersection_observers_.end(); ++it) {
+ if (it->Get() == observer) {
+ intersection_observers_.erase(it);
+ break;
+ }
+ }
+}
+
 void Document::Trace(GCVisitor* visitor) const {
  script_animation_controller_.Trace(visitor);
  visitor->TraceMember(current_script_);
+ for (auto& observer : intersection_observers_) {
+ visitor->TraceMember(observer);
+ }
  if (style_engine_ != nullptr) {
  style_engine_->Trace(visitor);
  }

bridge/core/dom/document.h

@@ -5,6 +5,8 @@
 #ifndef BRIDGE_DOCUMENT_H
 #define BRIDGE_DOCUMENT_H
 
+#include <unordered_set>
+
 #include "bindings/qjs/cppgc/local_handle.h"
 #include "container_node.h"
 #include "core/platform/url/kurl.h"
@@ -30,6 +32,7 @@ class Text;
 class Comment;
 class HTMLElement;
 class LiveNodeListBase;
+class IntersectionObserver;
 
 enum NodeListInvalidationType : int {
  kDoNotInvalidateOnAttributeChanges = 0,
@@ -174,6 +177,10 @@ class Document : public ContainerNode, public TreeScope {
  ExceptionState& exception_state);
  std::shared_ptr<EventListener> GetWindowAttributeEventListener(const AtomicString& event_type);
 
+ // Keep JS IntersectionObserver instances alive while observing targets.
+ void RegisterIntersectionObserver(IntersectionObserver* observer);
+ void UnregisterIntersectionObserver(IntersectionObserver* observer);
+
  void Trace(GCVisitor* visitor) const override;
  const DocumentPublicMethods* documentPublicMethods();
  StyleEngine& EnsureStyleEngine();
@@ -236,6 +243,8 @@ class Document : public ContainerNode, public TreeScope {
  KURL base_element_url_; // The URL set by the <base> element.
  KURL cookie_url_; // The URL to use for cookie access.
  Member<HTMLScriptElement> current_script_{nullptr};
+
+ std::unordered_set<Member<IntersectionObserver>, Member<IntersectionObserver>::KeyHasher> intersection_observers_;
 };
 
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