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ac6b3c989d
With this change, instead of applying scroll offsets during the recording of the painting command list, we do the following: 1. Collect all boxes with scrollable overflow into a PaintContext, each with an id and the total amount of scrolling offset accumulated from ancestor scrollable boxes. 2. During the recording phase assign a corresponding scroll_frame_id to each command that paints content within a scrollable box. 3. Before executing the recorded commands, translate each command that has a scroll_frame_id by the accumulated scroll offset. This approach has following advantages: - Implementing nested scrollables becomes much simpler, as the recording phase only requires the correct assignment of the nearest scrollable's scroll_frame_id, while the accumulated offset from ancestors is applied subsequently. - The recording of painting commands is not tied to a specific offset within scrollable boxes, which means in the future, it will be possible to update the scrolling offset and repaint without the need to re-record painting commands.
31 lines
701 B
C++
31 lines
701 B
C++
/*
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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/Painting/PaintableBox.h>
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namespace Web::Painting {
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class ViewportPaintable final : public PaintableWithLines {
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JS_CELL(ViewportPaintable, PaintableWithLines);
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public:
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static JS::NonnullGCPtr<ViewportPaintable> create(Layout::Viewport const&);
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virtual ~ViewportPaintable() override;
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void paint_all_phases(PaintContext&);
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void build_stacking_context_tree_if_needed();
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void collect_scroll_frames(PaintContext&) const;
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private:
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void build_stacking_context_tree();
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explicit ViewportPaintable(Layout::Viewport const&);
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};
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}
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