43 lines
1.8 KiB
C#
43 lines
1.8 KiB
C#
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using System.Globalization;
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using System.Windows.Data;
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namespace TeamsISO.App.Converters;
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/// <summary>
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/// Maps an audio level (0.0–1.0) to an opacity for a single audio-meter
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/// segment. The XAML binds five copies, each with a different
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/// <see cref="Binding.ConverterParameter"/> threshold (0.2, 0.4, 0.6,
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/// 0.8, 1.0). A segment renders at full opacity when the live level
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/// exceeds its threshold; below that it dims to a faint silhouette so the
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/// inactive segments still read as "the meter has 5 steps" rather than
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/// blank space.
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///
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/// Designed for the v2 "Studio Terminal" participants table's audio meter.
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/// Broadcast engineers expect instantaneous (non-averaged) bars; the
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/// converter is stateless and trusts the caller to push raw levels.
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/// </summary>
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public sealed class LevelThresholdConverter : IValueConverter
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{
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/// <summary>Opacity for an above-threshold segment. Defaults to 1.0.</summary>
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public double ActiveOpacity { get; set; } = 1.0;
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/// <summary>Opacity for a below-threshold segment. Defaults to 0.18 — visible enough to read the segment shape but clearly off.</summary>
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public double InactiveOpacity { get; set; } = 0.18;
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public object Convert(object value, System.Type targetType, object parameter, CultureInfo culture)
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{
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var level = value switch
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{
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double d => d,
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float f => f,
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_ => 0.0,
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};
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if (!double.TryParse(parameter?.ToString(), NumberStyles.Float, CultureInfo.InvariantCulture, out var threshold))
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threshold = 1.0;
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return level >= threshold ? ActiveOpacity : InactiveOpacity;
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}
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public object ConvertBack(object value, System.Type targetType, object parameter, CultureInfo culture) =>
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System.Windows.Data.Binding.DoNothing;
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}
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