XCEngine/new_editor/include/XCEditor/Collections/UIEditorScrollView.h

#pragma once

#include <XCEngine/UI/DrawData.h>
#include <XCEngine/UI/Types.h>

#include <cstdint>

namespace XCEngine::UI::Editor::Widgets {

enum class UIEditorScrollViewHitTargetKind : std::uint8_t {
    None = 0,
    Content,
    ScrollbarTrack,
    ScrollbarThumb
};

struct UIEditorScrollViewState {
    bool focused = false;
    bool hovered = false;
    bool scrollbarHovered = false;
    bool draggingScrollbarThumb = false;
};

struct UIEditorScrollViewMetrics {
    float scrollbarWidth = 10.0f;
    float scrollbarInset = 4.0f;
    float minThumbHeight = 28.0f;
    float cornerRounding = 8.0f;
    float borderThickness = 1.0f;
    float focusedBorderThickness = 2.0f;
    float wheelStep = 48.0f;
};

struct UIEditorScrollViewPalette {
    ::XCEngine::UI::UIColor surfaceColor =
        ::XCEngine::UI::UIColor(0.15f, 0.15f, 0.16f, 1.0f);
    ::XCEngine::UI::UIColor borderColor =
        ::XCEngine::UI::UIColor(0.30f, 0.32f, 0.34f, 1.0f);
    ::XCEngine::UI::UIColor focusedBorderColor =
        ::XCEngine::UI::UIColor(0.78f, 0.80f, 0.84f, 1.0f);
    ::XCEngine::UI::UIColor scrollbarTrackColor =
        ::XCEngine::UI::UIColor(0.19f, 0.19f, 0.21f, 1.0f);
    ::XCEngine::UI::UIColor scrollbarThumbColor =
        ::XCEngine::UI::UIColor(0.32f, 0.34f, 0.36f, 1.0f);
    ::XCEngine::UI::UIColor scrollbarThumbHoverColor =
        ::XCEngine::UI::UIColor(0.42f, 0.44f, 0.47f, 1.0f);
    ::XCEngine::UI::UIColor scrollbarThumbActiveColor =
        ::XCEngine::UI::UIColor(0.50f, 0.52f, 0.56f, 1.0f);
};

struct UIEditorScrollViewLayout {
    ::XCEngine::UI::UIRect bounds = {};
    ::XCEngine::UI::UIRect contentRect = {};
    ::XCEngine::UI::UIRect scrollbarTrackRect = {};
    ::XCEngine::UI::UIRect scrollbarThumbRect = {};
    float contentHeight = 0.0f;
    float verticalOffset = 0.0f;
    float maxOffset = 0.0f;
    bool hasScrollbar = false;
};

struct UIEditorScrollViewHitTarget {
    UIEditorScrollViewHitTargetKind kind = UIEditorScrollViewHitTargetKind::None;
};

bool IsUIEditorScrollViewPointInside(
    const ::XCEngine::UI::UIRect& rect,
    const ::XCEngine::UI::UIPoint& point);

float ClampUIEditorScrollViewOffset(
    const ::XCEngine::UI::UIRect& bounds,
    float contentHeight,
    float verticalOffset,
    const UIEditorScrollViewMetrics& metrics = {});

UIEditorScrollViewLayout BuildUIEditorScrollViewLayout(
    const ::XCEngine::UI::UIRect& bounds,
    float contentHeight,
    float verticalOffset,
    const UIEditorScrollViewMetrics& metrics = {});

::XCEngine::UI::UIPoint ResolveUIEditorScrollViewContentOrigin(
    const UIEditorScrollViewLayout& layout);

UIEditorScrollViewHitTarget HitTestUIEditorScrollView(
    const UIEditorScrollViewLayout& layout,
    const ::XCEngine::UI::UIPoint& point);

void AppendUIEditorScrollViewBackground(
    ::XCEngine::UI::UIDrawList& drawList,
    const UIEditorScrollViewLayout& layout,
    const UIEditorScrollViewState& state,
    const UIEditorScrollViewPalette& palette = {},
    const UIEditorScrollViewMetrics& metrics = {});

} // namespace XCEngine::UI::Editor::Widgets