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78 lines
1.9 KiB
78 lines
1.9 KiB
#pragma once |
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#include "DiabloUI/art.h" |
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#include "DiabloUI/ui_item.h" |
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namespace dvl { |
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extern Art ArtScrollBarBackground; |
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constexpr decltype(SDL_Rect().w) SCROLLBAR_BG_WIDTH = 25; |
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extern Art ArtScrollBarArrow; |
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enum class ScrollBarArrowFrame { |
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UP_ACTIVE = 0, |
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UP, |
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DOWN_ACTIVE, |
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DOWN, |
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}; |
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extern Art ArtScrollBarThumb; |
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constexpr decltype(SDL_Rect().w) SCROLLBAR_ARROW_WIDTH = 25; |
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inline SDL_Rect UpArrowRect(const UiScrollBar &sb) |
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{ |
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return { |
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sb.rect.x, |
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sb.rect.y, |
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SCROLLBAR_ARROW_WIDTH, |
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static_cast<decltype(SDL_Rect().h)>(sb.arrow->h()), |
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}; |
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} |
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inline SDL_Rect DownArrowRect(const UiScrollBar &sb) |
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{ |
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return { |
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sb.rect.x, |
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static_cast<decltype(SDL_Rect().y)>(sb.rect.y + sb.rect.h - sb.arrow->h()), |
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SCROLLBAR_ARROW_WIDTH, |
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static_cast<decltype(SDL_Rect().h)>(sb.arrow->h()), |
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}; |
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} |
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inline decltype(SDL_Rect().h) BarHeight(const UiScrollBar &sb) |
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{ |
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return sb.rect.h - 2 * sb.arrow->h(); |
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} |
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inline SDL_Rect BarRect(const UiScrollBar &sb) |
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{ |
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return { |
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sb.rect.x, |
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static_cast<decltype(SDL_Rect().y)>(sb.rect.y + sb.arrow->h()), |
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SCROLLBAR_BG_WIDTH, |
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BarHeight(sb), |
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}; |
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} |
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inline SDL_Rect ThumbRect(const UiScrollBar &sb, std::size_t selected_index, std::size_t num_items) |
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{ |
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constexpr int THUMB_OFFSET_X = 3; |
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const int thumb_max_y = BarHeight(sb) - sb.thumb->h(); |
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const int thumb_y = (selected_index * thumb_max_y / (num_items - 1)); |
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return { |
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static_cast<decltype(SDL_Rect().x)>(sb.rect.x + THUMB_OFFSET_X), |
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static_cast<decltype(SDL_Rect().y)>(sb.rect.y + sb.arrow->h() + thumb_y), |
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static_cast<decltype(SDL_Rect().w)>(sb.rect.w - THUMB_OFFSET_X), |
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static_cast<decltype(SDL_Rect().h)>(sb.thumb->h()), |
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}; |
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} |
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constexpr UiScrollBar MakeScrollBar(SDL_Rect rect) |
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{ |
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return UiScrollBar(&ArtScrollBarBackground, &ArtScrollBarThumb, &ArtScrollBarArrow, rect); |
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} |
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void LoadScrollBar(); |
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void UnloadScrollBar(); |
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} // namespace dvl
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