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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\HtmlToPdf\Box; |
| 6 | |
| 7 | /** |
| 8 | * A box that establishes a flex formatting context — `display: flex` |
| 9 | * (block-level) per CSS Flexible Box Layout 1 §3. |
| 10 | * |
| 11 | * Implemented surface (see `BlockLayout::layoutFlexBox`): |
| 12 | * |
| 13 | * - `flex-direction`: row / row-reverse / column / column-reverse. |
| 14 | * - `flex-wrap`: nowrap / wrap / wrap-reverse, including the §9.6 |
| 15 | * single-line cross-stretch rule. |
| 16 | * - `flex-grow` / `flex-shrink` / `flex-basis` resolved via the |
| 17 | * §9.7 "Resolve the Flexible Lengths" iterative algorithm with |
| 18 | * min/max main clamps. |
| 19 | * - `order`-based item reordering (stable on document order). |
| 20 | * - `justify-content`: flex-{start,end}, start, end, left, right, |
| 21 | * center, space-between, space-around, space-evenly (mirrored |
| 22 | * under reverse direction). |
| 23 | * - `align-items` / `align-self`: flex-{start,end}, start, end, |
| 24 | * center, stretch (cross-axis fills line extent). |
| 25 | * - `align-content`: stretch / center / flex-{start,end} / |
| 26 | * space-{between,around,evenly} across multiple flex lines. |
| 27 | * - `column-gap` / `row-gap` per Box Alignment 3 §8.1 axis pick; |
| 28 | * percentage gaps resolve against the container's content box. |
| 29 | * - `flex-basis: auto` + `width: auto` → max-content per §9.2. |
| 30 | * - `min-{width,height}: auto` floors at min-content per §4.5. |
| 31 | * - Absolutely-positioned children are removed from the flex |
| 32 | * flow and laid out against the flex container as positioned |
| 33 | * ancestor per §3. |
| 34 | * - Items resolve percentage heights against the flex container's |
| 35 | * declared height (not the outer CB). |
| 36 | * |
| 37 | * Deferred: baseline alignment, intrinsic-aspect-ratio transfer. |
| 38 | */ |
| 39 | final class FlexBox extends Box {} |