mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2025-10-16 13:09:41 +00:00
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.
58 lines
1.5 KiB
C++
58 lines
1.5 KiB
C++
/*
|
|
* Copyright (c) 2023, Andreas Kling <andreas@ladybird.org>
|
|
* Copyright (c) 2025, Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <LibWeb/DOM/EventTarget.h>
|
|
#include <LibWeb/PixelUnits.h>
|
|
|
|
namespace Web::CSS {
|
|
|
|
// https://drafts.csswg.org/cssom-view/#visualviewport
|
|
class VisualViewport final : public DOM::EventTarget {
|
|
WEB_PLATFORM_OBJECT(VisualViewport, DOM::EventTarget);
|
|
GC_DECLARE_ALLOCATOR(VisualViewport);
|
|
|
|
public:
|
|
[[nodiscard]] static GC::Ref<VisualViewport> create(DOM::Document&);
|
|
|
|
virtual ~VisualViewport() override = default;
|
|
|
|
CSSPixelPoint offset() const { return m_offset; }
|
|
|
|
[[nodiscard]] double offset_left() const;
|
|
[[nodiscard]] double offset_top() const;
|
|
|
|
[[nodiscard]] double page_left() const;
|
|
[[nodiscard]] double page_top() const;
|
|
|
|
[[nodiscard]] double width() const;
|
|
[[nodiscard]] double height() const;
|
|
|
|
[[nodiscard]] double scale() const;
|
|
|
|
void set_onresize(WebIDL::CallbackType*);
|
|
WebIDL::CallbackType* onresize();
|
|
void set_onscroll(WebIDL::CallbackType*);
|
|
WebIDL::CallbackType* onscroll();
|
|
void set_onscrollend(WebIDL::CallbackType*);
|
|
WebIDL::CallbackType* onscrollend();
|
|
|
|
void scroll_by(CSSPixelPoint delta) { m_offset += delta; }
|
|
|
|
private:
|
|
explicit VisualViewport(DOM::Document&);
|
|
|
|
virtual void initialize(JS::Realm&) override;
|
|
virtual void visit_edges(Cell::Visitor&) override;
|
|
|
|
GC::Ref<DOM::Document> m_document;
|
|
CSSPixelPoint m_offset;
|
|
double m_scale { 1.0 };
|
|
};
|
|
|
|
}
|