d838bc5e21
CompositorState still carried viewport scrollbar bookkeeping, hit testing, drag state, geometry helpers, and overlay painting alongside frame scheduling and async scroll state. That made the class responsible for both compositor orchestration and scrollbar interaction policy. Move the scrollbar-specific state and operations into ViewportScrollbarController. CompositorState now delegates hover/capture, drag delta calculation, and overlay painting while keeping async scroll mutation, frame scheduling, and WebContent notifications in the compositor state owner.
67 lines
2 KiB
C++
67 lines
2 KiB
C++
/*
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* Copyright (c) 2026, the Ladybird developers.
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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 <AK/Optional.h>
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#include <AK/Vector.h>
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#include <LibGfx/Forward.h>
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#include <LibGfx/Point.h>
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#include <LibWeb/Compositor/AsyncScrollingState.h>
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namespace Web::Compositor {
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class AsyncScrollTree;
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}
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namespace Web::Painting {
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class DisplayListPlayerSkia;
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class ScrollStateSnapshot;
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}
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namespace Compositor {
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class ViewportScrollbarController {
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public:
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struct Drag {
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size_t scrollbar_index { 0 };
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float primary_position { 0 };
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float thumb_grab_position { 0 };
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};
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struct ScrollDelta {
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Web::Compositor::AsyncScrollNodeID scroll_node_id;
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Gfx::FloatPoint delta;
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};
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void clear();
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void set_scrollbars(Vector<Web::Compositor::ViewportScrollbar> const&);
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bool is_empty() const { return m_scrollbars.is_empty(); }
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bool has_captured_scrollbar() const { return m_captured_scrollbar_index.has_value(); }
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Optional<size_t> hit_test(Web::Compositor::AsyncScrollTree const&, Web::Painting::ScrollStateSnapshot const&, Gfx::FloatPoint position) const;
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Optional<Drag> begin_drag(Web::Compositor::AsyncScrollTree const&, Web::Painting::ScrollStateSnapshot const&, Gfx::FloatPoint position);
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Optional<Drag> captured_drag(Gfx::FloatPoint position);
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Optional<Drag> release_captured_drag(Gfx::FloatPoint position);
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bool set_hovered_scrollbar(Optional<size_t>);
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Optional<ScrollDelta> scroll_delta_for_drag(Web::Compositor::AsyncScrollTree const&, Web::Painting::ScrollStateSnapshot const&, Drag const&) const;
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bool paint(Gfx::PaintingSurface&, Web::Painting::DisplayListPlayerSkia&, Web::Painting::ScrollStateSnapshot const&) const;
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private:
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bool is_expanded(size_t scrollbar_index) const;
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Vector<Web::Compositor::ViewportScrollbar> m_scrollbars;
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Optional<size_t> m_hovered_scrollbar_index;
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Optional<size_t> m_captured_scrollbar_index;
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float m_thumb_grab_position { 0 };
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};
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}
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