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b477c6bfc4
Implements spec algorithm for viewport scrolling that first checks if it's possible to use delta to move the visual viewport before falling back to scrolling the layout viewport. This is a part of pinch-to-zoom support.
148 lines
4.7 KiB
C++
148 lines
4.7 KiB
C++
/*
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* Copyright (c) 2023, Andreas Kling <andreas@ladybird.org>
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* Copyright (c) 2025, 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 <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/HTML/EventNames.h>
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namespace Web::CSS {
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GC_DEFINE_ALLOCATOR(VisualViewport);
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GC::Ref<VisualViewport> VisualViewport::create(DOM::Document& document)
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{
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return document.realm().create<VisualViewport>(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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void VisualViewport::initialize(JS::Realm& realm)
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{
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WEB_SET_PROTOTYPE_FOR_INTERFACE(VisualViewport);
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Base::initialize(realm);
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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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return m_offset.x().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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return m_offset.y().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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// 2. Otherwise, return the offset of the left edge of the visual viewport from the
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// left edge of the initial containing block of the layout viewport’s document.
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return m_document->viewport_rect().x().to_double() + 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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// 2. Otherwise, return the offset of the top edge of the visual viewport from the
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// top edge of the initial containing block of the layout viewport’s document.
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return m_document->viewport_rect().y().to_double() + 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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return m_document->viewport_rect().size().width() / m_scale;
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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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return m_document->viewport_rect().size().height() / m_scale;
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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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return m_scale;
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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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