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Adds the initial implementation for interfaces defined in the ResizeObserver specification. These interfaces will be used to construct and send observation events in the upcoming changes.
102 lines
4.4 KiB
C++
102 lines
4.4 KiB
C++
/*
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* Copyright (c) 2024, Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibJS/Heap/Heap.h>
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#include <LibWeb/Bindings/ExceptionOrUtils.h>
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#include <LibWeb/Bindings/Intrinsics.h>
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#include <LibWeb/Bindings/ResizeObserverEntryPrototype.h>
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#include <LibWeb/Painting/PaintableBox.h>
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#include <LibWeb/ResizeObserver/ResizeObserverEntry.h>
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namespace Web::ResizeObserver {
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JS_DEFINE_ALLOCATOR(ResizeObserverEntry);
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// https://drafts.csswg.org/resize-observer-1/#create-and-populate-resizeobserverentry-h
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WebIDL::ExceptionOr<JS::NonnullGCPtr<ResizeObserverEntry>> ResizeObserverEntry::create_and_populate(JS::Realm& realm, DOM::Element& target)
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{
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// 1. Let this be a new ResizeObserverEntry.
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// 2. Set this.target slot to target.
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auto resize_observer_entry = realm.heap().allocate<ResizeObserverEntry>(realm, realm, target);
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// 3. Set this.borderBoxSize slot to result of calculating box size given target and observedBox of "border-box".
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auto border_box_size = ResizeObserverSize::calculate_box_size(realm, target, Bindings::ResizeObserverBoxOptions::BorderBox);
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resize_observer_entry->m_border_box_size.append(border_box_size);
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// 4. Set this.contentBoxSize slot to result of calculating box size given target and observedBox of "content-box".
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auto content_box_size = ResizeObserverSize::calculate_box_size(realm, target, Bindings::ResizeObserverBoxOptions::ContentBox);
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resize_observer_entry->m_content_box_size.append(content_box_size);
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// 5. Set this.devicePixelContentBoxSize slot to result of calculating box size given target and observedBox of "device-pixel-content-box".
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auto device_pixel_content_box_size = ResizeObserverSize::calculate_box_size(realm, target, Bindings::ResizeObserverBoxOptions::DevicePixelContentBox);
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resize_observer_entry->m_device_pixel_content_box_size.append(device_pixel_content_box_size);
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// 6. Set this.contentRect to logical this.contentBoxSize given target and observedBox of "content-box".
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double x = 0;
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double y = 0;
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double width = content_box_size->inline_size();
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double height = content_box_size->block_size();
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// 7. If target is not an SVG element or target is an SVG element with an associated CSS layout box do these steps:
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if (!target.is_svg_element() && target.paintable_box()) {
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auto const& paintable_box = *target.paintable_box();
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auto absolute_padding_rect = paintable_box.absolute_padding_box_rect();
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// Set this.contentRect.top to target.padding top.
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y = absolute_padding_rect.y().to_double();
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// Set this.contentRect.left to target.padding left.
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x = absolute_padding_rect.x().to_double();
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} else if (target.is_svg_element() && target.paintable_box()) {
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// 8. If target is an SVG element without an associated CSS layout box do these steps:
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// Set this.contentRect.top and this.contentRect.left to 0.
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// NOTE: This is already done by the default constructor.
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}
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resize_observer_entry->m_content_rect = MUST(Geometry::DOMRectReadOnly::construct_impl(realm, x, y, width, height));
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return resize_observer_entry;
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}
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void ResizeObserverEntry::initialize(JS::Realm& realm)
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{
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Base::initialize(realm);
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set_prototype(&Bindings::ensure_web_prototype<Bindings::ResizeObserverEntryPrototype>(realm, "ResizeObserverEntry"_fly_string));
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}
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void ResizeObserverEntry::visit_edges(JS::Cell::Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(m_target);
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for (auto& size : m_content_box_size)
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visitor.visit(size);
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for (auto& size : m_border_box_size)
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visitor.visit(size);
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}
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static JS::NonnullGCPtr<JS::Object> to_js_array(JS::Realm& realm, Vector<JS::NonnullGCPtr<ResizeObserverSize>> const& sizes)
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{
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Vector<JS::Value> vector;
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for (auto const& size : sizes)
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vector.append(JS::Value(size.ptr()));
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auto array = JS::Array::create_from(realm, vector);
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MUST(array->set_integrity_level(JS::Object::IntegrityLevel::Frozen));
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return array;
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}
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JS::NonnullGCPtr<JS::Object> ResizeObserverEntry::border_box_size_js_array() const
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{
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return to_js_array(realm(), m_border_box_size);
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}
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JS::NonnullGCPtr<JS::Object> ResizeObserverEntry::content_box_size_js_array() const
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{
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return to_js_array(realm(), m_content_box_size);
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}
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JS::NonnullGCPtr<JS::Object> ResizeObserverEntry::device_pixel_content_box_size_js_array() const
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{
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return to_js_array(realm(), m_device_pixel_content_box_size);
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}
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}
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