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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\PagedMedia; |
| 6 | |
| 7 | /** |
| 8 | * CSS Paged Media 3 §5.2 — the 16 page-margin box positions. |
| 9 | * |
| 10 | * A `@page` rule may contain up to 16 nested at-rules, one per box |
| 11 | * position. Each one is a generated-content box positioned in the |
| 12 | * page margin area; the content is set via the `content:` property. |
| 13 | * |
| 14 | * Layout: |
| 15 | * |
| 16 | * ┌─────────┬────────────┬────────────┬────────────┬─────────┐ |
| 17 | * │ TL-Corner│ T-Left │ T-Center │ T-Right │TR-Corner│ |
| 18 | * ├─────────┼────────────┴────────────┴────────────┼─────────┤ |
| 19 | * │ L-Top │ │ R-Top │ |
| 20 | * ├─────────┤ ├─────────┤ |
| 21 | * │L-Middle │ Page content box │R-Middle │ |
| 22 | * ├─────────┤ ├─────────┤ |
| 23 | * │L-Bottom │ │R-Bottom │ |
| 24 | * ├─────────┼────────────┬────────────┬────────────┼─────────┤ |
| 25 | * │BL-Corner│ B-Left │ B-Center │ B-Right │BR-Corner│ |
| 26 | * └─────────┴────────────┴────────────┴────────────┴─────────┘ |
| 27 | * |
| 28 | * The four corners are box positions but typically used for |
| 29 | * decoration. The four edges hold the running headers and footers |
| 30 | * (`@top-center`, `@bottom-center` are the most common). |
| 31 | * |
| 32 | * Phase 4G.1 (extraction) maps each position to its at-rule prelude |
| 33 | * keyword (`@top-left`, `@top-center`, …) and its spatial |
| 34 | * coordinates within the page margin area. |
| 35 | */ |
| 36 | enum MarginBoxPosition: string |
| 37 | { |
| 38 | case TopLeftCorner = 'top-left-corner'; |
| 39 | case TopLeft = 'top-left'; |
| 40 | case TopCenter = 'top-center'; |
| 41 | case TopRight = 'top-right'; |
| 42 | case TopRightCorner = 'top-right-corner'; |
| 43 | |
| 44 | case LeftTop = 'left-top'; |
| 45 | case LeftMiddle = 'left-middle'; |
| 46 | case LeftBottom = 'left-bottom'; |
| 47 | |
| 48 | case RightTop = 'right-top'; |
| 49 | case RightMiddle = 'right-middle'; |
| 50 | case RightBottom = 'right-bottom'; |
| 51 | |
| 52 | case BottomLeftCorner = 'bottom-left-corner'; |
| 53 | case BottomLeft = 'bottom-left'; |
| 54 | case BottomCenter = 'bottom-center'; |
| 55 | case BottomRight = 'bottom-right'; |
| 56 | case BottomRightCorner = 'bottom-right-corner'; |
| 57 | |
| 58 | /** |
| 59 | * True for the four corner boxes. Corners have a single |
| 60 | * dimension determined by the adjacent margins (the top margin |
| 61 | * for top corners, etc.) rather than flowing along an edge. |
| 62 | */ |
| 63 | public function isCorner(): bool |
| 64 | { |
| 65 | return match ($this) { |
| 66 | self::TopLeftCorner, self::TopRightCorner, |
| 67 | self::BottomLeftCorner, self::BottomRightCorner => true, |
| 68 | default => false, |
| 69 | }; |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * The page edge this box sits along (`top` / `right` / `bottom` |
| 74 | * / `left`). Corner boxes return `null` (they sit at the |
| 75 | * intersection of two edges). |
| 76 | */ |
| 77 | public function edge(): ?string |
| 78 | { |
| 79 | return match ($this) { |
| 80 | self::TopLeft, self::TopCenter, self::TopRight => 'top', |
| 81 | self::RightTop, self::RightMiddle, self::RightBottom => 'right', |
| 82 | self::BottomLeft, self::BottomCenter, self::BottomRight => 'bottom', |
| 83 | self::LeftTop, self::LeftMiddle, self::LeftBottom => 'left', |
| 84 | default => null, |
| 85 | }; |
| 86 | } |
| 87 | } |