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| ViewTimeline | |
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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Css\Value; |
| 6 | |
| 7 | /** |
| 8 | * CSS Scroll-driven Animations 1 §4.2 — `view(<axis>? <inset>?)`. |
| 9 | * Anonymous view-progress timeline tied to the element's |
| 10 | * intersection with the scroll root. |
| 11 | * |
| 12 | * animation-timeline: view(); |
| 13 | * animation-timeline: view(block); |
| 14 | * animation-timeline: view(inline 20%); |
| 15 | * animation-timeline: view(20% 50%); |
| 16 | * |
| 17 | * For static print the timeline never advances; the typed value |
| 18 | * lets the cascade carry the declaration so tooling can read it |
| 19 | * back. |
| 20 | */ |
| 21 | final readonly class ViewTimeline extends Value |
| 22 | { |
| 23 | public function __construct( |
| 24 | public ?string $axis = null, |
| 25 | public ?Value $insetStart = null, |
| 26 | public ?Value $insetEnd = null, |
| 27 | ) {} |
| 28 | |
| 29 | public function toCss(): string |
| 30 | { |
| 31 | $parts = []; |
| 32 | if ($this->axis !== null) { |
| 33 | $parts[] = $this->axis; |
| 34 | } |
| 35 | if ($this->insetStart !== null) { |
| 36 | $parts[] = $this->insetStart->toCss(); |
| 37 | } |
| 38 | if ($this->insetEnd !== null) { |
| 39 | $parts[] = $this->insetEnd->toCss(); |
| 40 | } |
| 41 | return $parts === [] |
| 42 | ? 'view()' |
| 43 | : 'view(' . implode(' ', $parts) . ')'; |
| 44 | } |
| 45 | } |