133 lines
3.3 KiB
Dart
133 lines
3.3 KiB
Dart
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/// 滚动字幕配置参数：速度档位与级别。
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///
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/// 与 Web 后台 `/views/modules/theme/scrolling-text.data.ts` 保持一致，
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/// 移动端仅展示档位文案，落库仍是原始数值，便于与 Web 端互相识别。
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///
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/// 速度（scrollSpeed，单位 ms/像素，数值越小滚动越快）：
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/// - 慢 = 200
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/// - 较慢 = 100
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/// - 中 = 50
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/// - 较快 = 30
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/// - 快 = 10
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///
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/// 级别（level）：
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/// - 危险 = 50
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/// - 紧急 = 40
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/// - 普通 = 20
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class MarqueeConfig {
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const MarqueeConfig({
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this.speed = MarqueeSpeed.medium,
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this.grade = MarqueeGrade.normal,
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});
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final MarqueeSpeed speed;
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final MarqueeGrade grade;
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/// 将任意历史 speed 值吸附到最近档位（兼容 Web 端精确值）。
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static MarqueeSpeed speedFromValue(int? value) {
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if (value == null) return MarqueeSpeed.medium;
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final target = MarqueeSpeed.values.fold<MarqueeSpeed>(
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MarqueeSpeed.values.first,
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(closest, current) {
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final diffClosest = (closest.value - value).abs();
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final diffCurrent = (current.value - value).abs();
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return diffCurrent < diffClosest ? current : closest;
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},
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);
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return target;
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}
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/// 将任意历史 level 值吸附到最近级别。
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static MarqueeGrade gradeFromValue(int? value) {
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if (value == null) return MarqueeGrade.normal;
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final target = MarqueeGrade.values.fold<MarqueeGrade>(
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MarqueeGrade.values.first,
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(closest, current) {
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final diffClosest = (closest.value - value).abs();
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final diffCurrent = (current.value - value).abs();
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return diffCurrent < diffClosest ? current : closest;
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},
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);
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return target;
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}
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MarqueeConfig setSpeed(MarqueeSpeed speed) =>
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MarqueeConfig(speed: speed, grade: grade);
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MarqueeConfig setGrade(MarqueeGrade grade) =>
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MarqueeConfig(speed: speed, grade: grade);
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MarqueeConfig copyWith({
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MarqueeSpeed? speed,
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MarqueeGrade? grade,
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}) =>
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MarqueeConfig(
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speed: speed ?? this.speed,
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grade: grade ?? this.grade,
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);
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}
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/// 滚动速度档位。
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enum MarqueeSpeed {
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slow(200, '慢'),
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slower(100, '较慢'),
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medium(50, '中'),
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faster(30, '较快'),
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fast(10, '快');
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const MarqueeSpeed(this.value, this.labelZh);
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/// 后端落库值。
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final int value;
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/// 中文展示文案。
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final String labelZh;
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/// 英文展示文案。
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String get labelEn {
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switch (this) {
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case MarqueeSpeed.slow:
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return 'Slow';
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case MarqueeSpeed.slower:
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return 'Slower';
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case MarqueeSpeed.medium:
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return 'Medium';
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case MarqueeSpeed.faster:
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return 'Faster';
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case MarqueeSpeed.fast:
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return 'Fast';
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}
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}
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String label(bool useEnglish) => useEnglish ? labelEn : labelZh;
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}
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/// 滚动字幕级别。
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enum MarqueeGrade {
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danger(50, '危险'),
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urgent(40, '紧急'),
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normal(20, '普通');
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const MarqueeGrade(this.value, this.labelZh);
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/// 后端落库值。
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final int value;
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/// 中文展示文案。
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final String labelZh;
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/// 英文展示文案。
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String get labelEn {
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switch (this) {
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case MarqueeGrade.danger:
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return 'Danger';
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case MarqueeGrade.urgent:
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return 'Urgent';
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case MarqueeGrade.normal:
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return 'Normal';
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}
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}
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String label(bool useEnglish) => useEnglish ? labelEn : labelZh;
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}
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