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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\HtmlToPdf\Box; |
| 6 | |
| 7 | /** |
| 8 | * A box that's inline-level on the outside but opaque to inline layout — |
| 9 | * `display: inline-block`, replaced elements (`<img>`, `<input>`), |
| 10 | * `<svg>`, etc. |
| 11 | * |
| 12 | * Treated as a single atomic glyph in the parent inline formatting |
| 13 | * context: it takes a known width / height computed from its own |
| 14 | * intrinsic dimensions or CSS sizing, but its internal layout is its |
| 15 | * own affair (typically a BFC). |
| 16 | */ |
| 17 | final class AtomicInlineBox extends Box |
| 18 | { |
| 19 | /** |
| 20 | * CSS 2.1 §10.3.9 — the content-box inline size this box resolved to |
| 21 | * when its own formatting context was laid out, set by |
| 22 | * `BlockLayout::layoutInlineAtomicContents()` before the surrounding |
| 23 | * inline formatting context runs. |
| 24 | * |
| 25 | * `null` means the box was never pre-laid (a replaced element, or one |
| 26 | * with no in-flow children), in which case `InlineLayout` falls back |
| 27 | * to sizing it straight off the cascade. |
| 28 | */ |
| 29 | public ?float $laidOutContentWidth = null; |
| 30 | |
| 31 | /** Companion block size for {@see $laidOutContentWidth}. */ |
| 32 | public ?float $laidOutContentHeight = null; |
| 33 | |
| 34 | /** |
| 35 | * CSS 2.1 §10.8.1 — the box's alphabetic baseline, as an offset down |
| 36 | * from its CONTENT-box top edge. |
| 37 | * |
| 38 | * `null` means the box has no in-flow line box to take a baseline from, |
| 39 | * or its `overflow` is not `visible`; §10.8.1 then makes the baseline |
| 40 | * the bottom margin edge, which is what `InlineLayout` falls back to. |
| 41 | * |
| 42 | * Captured during the pre-layout pass rather than derived later: the |
| 43 | * inline formatting context overwrites the box's own `geometry->y` |
| 44 | * while placing it, so the offset cannot be recovered from geometry |
| 45 | * afterwards. |
| 46 | */ |
| 47 | public ?float $laidOutBaseline = null; |
| 48 | } |