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| 1 | +import 'css_length.dart'; |
| 2 | +import 'css_value.dart'; |
| 3 | + |
| 4 | +/// CSS scroll-margin property values. |
| 5 | +sealed class CssScrollMargin implements CssValue { |
| 6 | + const CssScrollMargin._(); |
| 7 | + |
| 8 | + /// Same value for all four sides. |
| 9 | + /// |
| 10 | + /// Example: `CssScrollMargin.all(CssLength.px(10))` → `10px` |
| 11 | + factory CssScrollMargin.all(CssLength value) = _CssScrollMarginAll; |
| 12 | + |
| 13 | + /// Symmetric scroll margin (vertical and horizontal). |
| 14 | + /// |
| 15 | + /// Example: `CssScrollMargin.symmetric(CssLength.px(10), CssLength.px(20))` → `10px 20px` |
| 16 | + factory CssScrollMargin.symmetric(CssLength vertical, CssLength horizontal) = |
| 17 | + _CssScrollMarginSymmetric; |
| 18 | + |
| 19 | + /// Individual sides. |
| 20 | + /// |
| 21 | + /// Example: `CssScrollMargin.only(top: CssLength.px(10), right: CssLength.px(20), bottom: CssLength.px(30), left: CssLength.px(40))` → `10px 20px 30px 40px` |
| 22 | + factory CssScrollMargin.only({ |
| 23 | + CssLength? top, |
| 24 | + CssLength? right, |
| 25 | + CssLength? bottom, |
| 26 | + CssLength? left, |
| 27 | + }) = _CssScrollMarginOnly; |
| 28 | + |
| 29 | + /// CSS variable reference. |
| 30 | + factory CssScrollMargin.variable(String varName) = _CssScrollMarginVariable; |
| 31 | + |
| 32 | + /// Raw CSS value escape hatch. |
| 33 | + factory CssScrollMargin.raw(String value) = _CssScrollMarginRaw; |
| 34 | + |
| 35 | + /// Global keyword (inherit, initial, unset, revert). |
| 36 | + factory CssScrollMargin.global(CssGlobal global) = _CssScrollMarginGlobal; |
| 37 | +} |
| 38 | + |
| 39 | +final class _CssScrollMarginAll extends CssScrollMargin { |
| 40 | + final CssLength value; |
| 41 | + const _CssScrollMarginAll(this.value) : super._(); |
| 42 | + |
| 43 | + @override |
| 44 | + String toCss() => value.toCss(); |
| 45 | +} |
| 46 | + |
| 47 | +final class _CssScrollMarginSymmetric extends CssScrollMargin { |
| 48 | + final CssLength vertical; |
| 49 | + final CssLength horizontal; |
| 50 | + const _CssScrollMarginSymmetric(this.vertical, this.horizontal) : super._(); |
| 51 | + |
| 52 | + @override |
| 53 | + String toCss() => '${vertical.toCss()} ${horizontal.toCss()}'; |
| 54 | +} |
| 55 | + |
| 56 | +final class _CssScrollMarginOnly extends CssScrollMargin { |
| 57 | + final CssLength? top; |
| 58 | + final CssLength? right; |
| 59 | + final CssLength? bottom; |
| 60 | + final CssLength? left; |
| 61 | + const _CssScrollMarginOnly({this.top, this.right, this.bottom, this.left}) |
| 62 | + : super._(); |
| 63 | + |
| 64 | + @override |
| 65 | + String toCss() { |
| 66 | + final t = top ?? CssLength.zero; |
| 67 | + final r = right ?? CssLength.zero; |
| 68 | + final b = bottom ?? CssLength.zero; |
| 69 | + final l = left ?? CssLength.zero; |
| 70 | + return '${t.toCss()} ${r.toCss()} ${b.toCss()} ${l.toCss()}'; |
| 71 | + } |
| 72 | +} |
| 73 | + |
| 74 | +final class _CssScrollMarginVariable extends CssScrollMargin { |
| 75 | + final String varName; |
| 76 | + const _CssScrollMarginVariable(this.varName) : super._(); |
| 77 | + |
| 78 | + @override |
| 79 | + String toCss() => 'var(--$varName)'; |
| 80 | +} |
| 81 | + |
| 82 | +final class _CssScrollMarginRaw extends CssScrollMargin { |
| 83 | + final String value; |
| 84 | + const _CssScrollMarginRaw(this.value) : super._(); |
| 85 | + |
| 86 | + @override |
| 87 | + String toCss() => value; |
| 88 | +} |
| 89 | + |
| 90 | +final class _CssScrollMarginGlobal extends CssScrollMargin { |
| 91 | + final CssGlobal global; |
| 92 | + const _CssScrollMarginGlobal(this.global) : super._(); |
| 93 | + |
| 94 | + @override |
| 95 | + String toCss() => global.toCss(); |
| 96 | +} |
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