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LibWeb: Implement basic version of CSSOM View's VisualViewport
We got some errors while loading https://twinings.co.uk/ about this interface missing, and it looked fairly simple so I sketched it out. Note that I did leave some FIXMEs where it's not clear exactly which metrics we should be returning.
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13 changed files with 257 additions and 2 deletions
154
Userland/Libraries/LibWeb/CSS/VisualViewport.cpp
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154
Userland/Libraries/LibWeb/CSS/VisualViewport.cpp
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/*
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* Copyright (c) 2023, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibWeb/Bindings/Intrinsics.h>
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#include <LibWeb/Bindings/VisualViewportPrototype.h>
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#include <LibWeb/CSS/VisualViewport.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/DOM/EventDispatcher.h>
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#include <LibWeb/DOM/IDLEventListener.h>
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#include <LibWeb/HTML/EventHandler.h>
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#include <LibWeb/HTML/EventNames.h>
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namespace Web::CSS {
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WebIDL::ExceptionOr<JS::NonnullGCPtr<VisualViewport>> VisualViewport::create(DOM::Document& document)
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{
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return MUST_OR_THROW_OOM(document.heap().allocate<VisualViewport>(document.realm(), document));
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}
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VisualViewport::VisualViewport(DOM::Document& document)
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: DOM::EventTarget(document.realm())
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, m_document(document)
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{
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}
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JS::ThrowCompletionOr<void> VisualViewport::initialize(JS::Realm& realm)
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{
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MUST_OR_THROW_OOM(Base::initialize(realm));
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set_prototype(&Bindings::ensure_web_prototype<Bindings::VisualViewportPrototype>(realm, "VisualViewport"));
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return {};
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}
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void VisualViewport::visit_edges(Cell::Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(m_document);
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}
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// https://drafts.csswg.org/cssom-view/#dom-visualviewport-offsetleft
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double VisualViewport::offset_left() const
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{
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// 1. If the visual viewport’s associated document is not fully active, return 0.
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if (!m_document->is_fully_active())
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return 0;
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// 2. Otherwise, return the offset of the left edge of the visual viewport from the left edge of the layout viewport.
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VERIFY(m_document->browsing_context());
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return m_document->browsing_context()->viewport_rect().left().to_double();
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}
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// https://drafts.csswg.org/cssom-view/#dom-visualviewport-offsettop
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double VisualViewport::offset_top() const
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{
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// 1. If the visual viewport’s associated document is not fully active, return 0.
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if (!m_document->is_fully_active())
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return 0;
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// 2. Otherwise, return the offset of the top edge of the visual viewport from the top edge of the layout viewport.
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VERIFY(m_document->browsing_context());
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return m_document->browsing_context()->viewport_rect().top().to_double();
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}
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// https://drafts.csswg.org/cssom-view/#dom-visualviewport-pageleft
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double VisualViewport::page_left() const
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{
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// 1. If the visual viewport’s associated document is not fully active, return 0.
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if (!m_document->is_fully_active())
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return 0;
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// FIXME: 2. Otherwise, return the offset of the left edge of the visual viewport
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// from the left edge of the initial containing block of the layout viewport’s document.
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return offset_left();
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}
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// https://drafts.csswg.org/cssom-view/#dom-visualviewport-pagetop
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double VisualViewport::page_top() const
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{
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// 1. If the visual viewport’s associated document is not fully active, return 0.
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if (!m_document->is_fully_active())
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return 0;
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// FIXME: 2. Otherwise, return the offset of the top edge of the visual viewport
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// from the top edge of the initial containing block of the layout viewport’s document.
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return offset_top();
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}
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// https://drafts.csswg.org/cssom-view/#dom-visualviewport-width
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double VisualViewport::width() const
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{
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// 1. If the visual viewport’s associated document is not fully active, return 0.
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if (!m_document->is_fully_active())
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return 0;
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// 2. Otherwise, return the width of the visual viewport
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// FIXME: excluding the width of any rendered vertical classic scrollbar that is fixed to the visual viewport.
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VERIFY(m_document->browsing_context());
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return m_document->browsing_context()->viewport_rect().width().to_double();
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}
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// https://drafts.csswg.org/cssom-view/#dom-visualviewport-height
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double VisualViewport::height() const
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{
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// 1. If the visual viewport’s associated document is not fully active, return 0.
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if (!m_document->is_fully_active())
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return 0;
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// 2. Otherwise, return the height of the visual viewport
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// FIXME: excluding the height of any rendered vertical classic scrollbar that is fixed to the visual viewport.
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VERIFY(m_document->browsing_context());
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return m_document->browsing_context()->viewport_rect().height().to_double();
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}
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// https://drafts.csswg.org/cssom-view/#dom-visualviewport-scale
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double VisualViewport::scale() const
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{
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// FIXME: Implement.
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return 1;
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}
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void VisualViewport::set_onresize(WebIDL::CallbackType* event_handler)
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{
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set_event_handler_attribute(HTML::EventNames::resize, event_handler);
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}
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WebIDL::CallbackType* VisualViewport::onresize()
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{
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return event_handler_attribute(HTML::EventNames::resize);
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}
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void VisualViewport::set_onscroll(WebIDL::CallbackType* event_handler)
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{
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set_event_handler_attribute(HTML::EventNames::scroll, event_handler);
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}
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WebIDL::CallbackType* VisualViewport::onscroll()
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{
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return event_handler_attribute(HTML::EventNames::scroll);
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}
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void VisualViewport::set_onscrollend(WebIDL::CallbackType* event_handler)
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{
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set_event_handler_attribute(HTML::EventNames::scrollend, event_handler);
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}
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WebIDL::CallbackType* VisualViewport::onscrollend()
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{
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return event_handler_attribute(HTML::EventNames::scrollend);
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}
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}
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49
Userland/Libraries/LibWeb/CSS/VisualViewport.h
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49
Userland/Libraries/LibWeb/CSS/VisualViewport.h
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/*
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* Copyright (c) 2023, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <LibWeb/DOM/EventTarget.h>
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namespace Web::CSS {
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// https://drafts.csswg.org/cssom-view/#visualviewport
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class VisualViewport final : public DOM::EventTarget {
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WEB_PLATFORM_OBJECT(VisualViewport, DOM::EventTarget);
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public:
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static WebIDL::ExceptionOr<JS::NonnullGCPtr<VisualViewport>> create(DOM::Document&);
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virtual ~VisualViewport() override = default;
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[[nodiscard]] double offset_left() const;
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[[nodiscard]] double offset_top() const;
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[[nodiscard]] double page_left() const;
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[[nodiscard]] double page_top() const;
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[[nodiscard]] double width() const;
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[[nodiscard]] double height() const;
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[[nodiscard]] double scale() const;
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void set_onresize(WebIDL::CallbackType*);
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WebIDL::CallbackType* onresize();
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void set_onscroll(WebIDL::CallbackType*);
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WebIDL::CallbackType* onscroll();
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void set_onscrollend(WebIDL::CallbackType*);
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WebIDL::CallbackType* onscrollend();
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private:
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explicit VisualViewport(DOM::Document&);
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virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
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virtual void visit_edges(Cell::Visitor&) override;
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JS::NonnullGCPtr<DOM::Document> m_document;
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};
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}
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21
Userland/Libraries/LibWeb/CSS/VisualViewport.idl
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Userland/Libraries/LibWeb/CSS/VisualViewport.idl
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#import <DOM/EventTarget.idl>
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[Exposed=Window]
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interface VisualViewport : EventTarget {
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readonly attribute double offsetLeft;
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readonly attribute double offsetTop;
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readonly attribute double pageLeft;
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readonly attribute double pageTop;
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readonly attribute double width;
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readonly attribute double height;
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readonly attribute double scale;
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attribute EventHandler onresize;
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attribute EventHandler onscroll;
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attribute EventHandler onscrollend;
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};
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