| 1 | using SkiaSharp; |
| 2 | |
| 3 | namespace CascadeIDE.Views.Chat.Skia; |
| 4 | |
| 5 | /// <summary>Колонка роли слева от тела сообщения — метрики из <see cref="SkiaChatFeedLayout"/>.</summary> |
| 6 | internal static class SkiaChatFeedRoleRail |
| 7 | { |
| 8 | public static void Draw( |
| 9 | SKCanvas canvas, |
| 10 | SkiaChatTheme theme, |
| 11 | float railLeft, |
| 12 | float top, |
| 13 | float bottom, |
| 14 | string roleLabel, |
| 15 | in SkiaChatFeedLayout layout) |
| 16 | { |
| 17 | if (string.IsNullOrWhiteSpace(roleLabel)) |
| 18 | return; |
| 19 | |
| 20 | var railWidth = layout.RoleRailWidth; |
| 21 | var railRect = new SKRect(railLeft, top, railLeft + railWidth, bottom); |
| 22 | canvas.Save(); |
| 23 | canvas.ClipRect(railRect); |
| 24 | |
| 25 | using var rulePaint = new SKPaint |
| 26 | { |
| 27 | Color = theme.Border.WithAlpha(90), |
| 28 | IsAntialias = true, |
| 29 | Style = SKPaintStyle.Stroke, |
| 30 | StrokeWidth = 1f, |
| 31 | }; |
| 32 | canvas.DrawLine(railRect.Right, railRect.Top + layout.RowEdgePad, railRect.Right, railRect.Bottom - layout.RowEdgePad, rulePaint); |
| 33 | |
| 34 | using var font = SkiaChatFeedFontResolver.CreateFont( |
| 35 | layout.RoleFamily, |
| 36 | layout.RoleLabelFontSize, |
| 37 | SKFontStyle.Bold); |
| 38 | using var paint = new SKPaint |
| 39 | { |
| 40 | IsAntialias = true, |
| 41 | Color = theme.Role.WithAlpha(235), |
| 42 | }; |
| 43 | var baseline = layout.RoleLabelBaselineY(top); |
| 44 | var text = TruncateToWidth(roleLabel, font, layout.RoleLabelMaxWidth); |
| 45 | canvas.DrawText(text, railLeft + layout.RoleLabelInset, baseline, SKTextAlign.Left, font, paint); |
| 46 | canvas.Restore(); |
| 47 | } |
| 48 | |
| 49 | private static string TruncateToWidth(string text, SKFont font, float maxWidth) |
| 50 | { |
| 51 | if (string.IsNullOrEmpty(text) || font.MeasureText(text) <= maxWidth) |
| 52 | return text; |
| 53 | |
| 54 | const string ellipsis = "…"; |
| 55 | var ellipsisWidth = font.MeasureText(ellipsis); |
| 56 | var maxBody = Math.Max(0f, maxWidth - ellipsisWidth); |
| 57 | for (var len = text.Length; len > 0; len--) |
| 58 | { |
| 59 | var slice = text[..len]; |
| 60 | if (font.MeasureText(slice) <= maxBody) |
| 61 | return slice + ellipsis; |
| 62 | } |
| 63 | |
| 64 | return ellipsis; |
| 65 | } |
| 66 | } |
| 67 | |