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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Pdf\Writer; |
| 6 | |
| 7 | use Phpdftk\FontMetrics\AfmData; |
| 8 | use Phpdftk\Pdf\Core\Content\ContentStream; |
| 9 | |
| 10 | /** |
| 11 | * Renders {@see ListBlock} content into a {@see ContentStream}. |
| 12 | * |
| 13 | * The renderer is stateless; pagination logic lives at the call site |
| 14 | * (`Pdf::addList` measures each item and starts a new page when one |
| 15 | * would overflow). Items are independent — measure and draw one at a |
| 16 | * time, threading a running item number for numbered lists. |
| 17 | * |
| 18 | * Coordinates: `$y` is the top of the area available to the item; the |
| 19 | * renderer draws downward and returns the height consumed. |
| 20 | */ |
| 21 | final class ListRenderer |
| 22 | { |
| 23 | /** |
| 24 | * Height needed to render a single item, in points. |
| 25 | */ |
| 26 | public function measureItem( |
| 27 | string $item, |
| 28 | float $maxWidth, |
| 29 | Font $font, |
| 30 | AfmData $metrics, |
| 31 | float $fontSize, |
| 32 | float $lineHeight, |
| 33 | ListStyle $style, |
| 34 | ): float { |
| 35 | $textWidth = max(0.0, $maxWidth - $style->indent); |
| 36 | $encoded = $font->getTextEncoder()?->encode($item) ?? $item; |
| 37 | $lines = TextLayout::wrap($encoded, $metrics, $fontSize, $textWidth); |
| 38 | $lineCount = max(1, count($lines)); |
| 39 | return $lineCount * $fontSize * $lineHeight + $style->itemSpacing; |
| 40 | } |
| 41 | |
| 42 | /** |
| 43 | * Draw a single item at `(x, y)`. The marker (bullet glyph or |
| 44 | * numbered prefix) sits at `$x`; the wrapped text starts at |
| 45 | * `$x + $style->indent`. |
| 46 | */ |
| 47 | public function drawItem( |
| 48 | ContentStream $cs, |
| 49 | float $x, |
| 50 | float $y, |
| 51 | string $item, |
| 52 | float $maxWidth, |
| 53 | Font $font, |
| 54 | AfmData $metrics, |
| 55 | float $fontSize, |
| 56 | float $lineHeight, |
| 57 | ListStyle $style, |
| 58 | ?int $itemNumber, |
| 59 | ): float { |
| 60 | $textX = $x + $style->indent; |
| 61 | $textWidth = max(0.0, $maxWidth - $style->indent); |
| 62 | |
| 63 | $marker = $itemNumber !== null |
| 64 | ? $itemNumber . $style->numberSuffix |
| 65 | : $style->bulletAt(0); |
| 66 | |
| 67 | $encoder = $font->getTextEncoder(); |
| 68 | $encodedMarker = $encoder?->encode($marker) ?? $marker; |
| 69 | $encodedItem = $encoder?->encode($item) ?? $item; |
| 70 | |
| 71 | $lines = TextLayout::wrap($encodedItem, $metrics, $fontSize, $textWidth); |
| 72 | if ($lines === []) { |
| 73 | $lines = ['']; |
| 74 | } |
| 75 | |
| 76 | $lineH = $fontSize * $lineHeight; |
| 77 | foreach ($lines as $lineIdx => $line) { |
| 78 | $baselineY = $y - ($lineIdx + 1) * $lineH + ($lineH - $fontSize) / 2.0; |
| 79 | |
| 80 | if ($lineIdx === 0) { |
| 81 | $cs->beginText() |
| 82 | ->setFont($font->getResourceName(), $fontSize) |
| 83 | ->moveTextPosition($x, $baselineY) |
| 84 | ->showText($encodedMarker) |
| 85 | ->endText(); |
| 86 | } |
| 87 | |
| 88 | if ($line !== '') { |
| 89 | $cs->beginText() |
| 90 | ->setFont($font->getResourceName(), $fontSize) |
| 91 | ->moveTextPosition($textX, $baselineY) |
| 92 | ->showText($line) |
| 93 | ->endText(); |
| 94 | } |
| 95 | } |
| 96 | |
| 97 | return count($lines) * $lineH + $style->itemSpacing; |
| 98 | } |
| 99 | |
| 100 | /** |
| 101 | * Convenience: draw an entire {@see ListBlock} starting at `(x, y)` |
| 102 | * without pagination. Returns the height consumed. Useful for |
| 103 | * `Writer\Page::drawList()` — for flow-paginated rendering, drive |
| 104 | * the per-item loop yourself via {@see measureItem}/{@see drawItem}. |
| 105 | */ |
| 106 | public function drawBlock( |
| 107 | ContentStream $cs, |
| 108 | float $x, |
| 109 | float $y, |
| 110 | ListBlock $block, |
| 111 | float $maxWidth, |
| 112 | Font $font, |
| 113 | AfmData $metrics, |
| 114 | float $fontSize, |
| 115 | float $lineHeight, |
| 116 | ListStyle $style, |
| 117 | ): float { |
| 118 | $consumed = 0.0; |
| 119 | $itemNumber = 1; |
| 120 | foreach ($block->items as $item) { |
| 121 | $h = $this->drawItem( |
| 122 | $cs, |
| 123 | $x, |
| 124 | $y - $consumed, |
| 125 | $item, |
| 126 | $maxWidth, |
| 127 | $font, |
| 128 | $metrics, |
| 129 | $fontSize, |
| 130 | $lineHeight, |
| 131 | $style, |
| 132 | $block->numbered ? $itemNumber : null, |
| 133 | ); |
| 134 | $consumed += $h; |
| 135 | $itemNumber++; |
| 136 | } |
| 137 | return $consumed; |
| 138 | } |
| 139 | } |