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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.
54 lines
1.7 KiB
C++
54 lines
1.7 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/DOM/Element.h>
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#include <LibWeb/Painting/PaintableBox.h>
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#include <LibWeb/ResizeObserver/ResizeObservation.h>
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namespace Web::ResizeObserver {
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JS_DEFINE_ALLOCATOR(ResizeObservation);
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WebIDL::ExceptionOr<JS::NonnullGCPtr<ResizeObservation>> ResizeObservation::create(JS::Realm& realm, DOM::Element& target, Bindings::ResizeObserverBoxOptions observed_box)
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{
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return realm.heap().allocate<ResizeObservation>(realm, realm, target, observed_box);
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}
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ResizeObservation::ResizeObservation(JS::Realm& realm, DOM::Element& target, Bindings::ResizeObserverBoxOptions observed_box)
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: m_realm(realm)
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, m_target(target)
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, m_observed_box(observed_box)
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{
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auto computed_size = realm.heap().allocate<ResizeObserverSize>(realm, realm);
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m_last_reported_sizes.append(computed_size);
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}
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void ResizeObservation::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_last_reported_sizes)
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visitor.visit(size);
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}
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// https://drafts.csswg.org/resize-observer-1/#dom-resizeobservation-isactive
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bool ResizeObservation::is_active()
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{
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// 1. Set currentSize by calculate box size given target and observedBox.
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auto current_size = ResizeObserverSize::calculate_box_size(m_realm, m_target, m_observed_box);
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// 2. Return true if currentSize is not equal to the first entry in this.lastReportedSizes.
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VERIFY(!m_last_reported_sizes.is_empty());
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if (!m_last_reported_sizes.first()->equals(*current_size))
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return true;
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// 3. Return false.
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return false;
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}
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}
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