fb8edcea00
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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