108 lines
3.0 KiB
C#
108 lines
3.0 KiB
C#
// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT license.
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using SkiaSharp;
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namespace Microsoft.Maui.Platform;
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/// <summary>
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/// Skia-rendered activity indicator (spinner) control.
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/// </summary>
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public class SkiaActivityIndicator : SkiaView
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{
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private bool _isRunning;
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private float _rotationAngle;
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private DateTime _lastUpdateTime = DateTime.UtcNow;
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public bool IsRunning
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{
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get => _isRunning;
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set
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{
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if (_isRunning != value)
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{
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_isRunning = value;
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if (value)
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{
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_lastUpdateTime = DateTime.UtcNow;
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}
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Invalidate();
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}
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}
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}
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public SKColor Color { get; set; } = new SKColor(0x21, 0x96, 0xF3);
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public SKColor DisabledColor { get; set; } = new SKColor(0xBD, 0xBD, 0xBD);
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public float Size { get; set; } = 32;
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public float StrokeWidth { get; set; } = 3;
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public float RotationSpeed { get; set; } = 360; // Degrees per second
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public int ArcCount { get; set; } = 12;
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protected override void OnDraw(SKCanvas canvas, SKRect bounds)
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{
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if (!IsRunning && !IsEnabled)
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{
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return;
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}
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var centerX = bounds.MidX;
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var centerY = bounds.MidY;
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var radius = Math.Min(Size / 2, Math.Min(bounds.Width, bounds.Height) / 2) - StrokeWidth;
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// Update rotation
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if (IsRunning)
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{
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var now = DateTime.UtcNow;
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var elapsed = (now - _lastUpdateTime).TotalSeconds;
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_lastUpdateTime = now;
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_rotationAngle = (_rotationAngle + (float)(RotationSpeed * elapsed)) % 360;
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}
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canvas.Save();
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canvas.Translate(centerX, centerY);
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canvas.RotateDegrees(_rotationAngle);
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var color = IsEnabled ? Color : DisabledColor;
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// Draw arcs with varying opacity
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for (int i = 0; i < ArcCount; i++)
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{
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var alpha = (byte)(255 * (1 - (float)i / ArcCount));
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var arcColor = color.WithAlpha(alpha);
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using var paint = new SKPaint
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{
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Color = arcColor,
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IsAntialias = true,
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Style = SKPaintStyle.Stroke,
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StrokeWidth = StrokeWidth,
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StrokeCap = SKStrokeCap.Round
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};
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var startAngle = (360f / ArcCount) * i;
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var sweepAngle = 360f / ArcCount / 2;
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using var path = new SKPath();
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path.AddArc(
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new SKRect(-radius, -radius, radius, radius),
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startAngle,
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sweepAngle);
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canvas.DrawPath(path, paint);
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}
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canvas.Restore();
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// Request redraw for animation
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if (IsRunning)
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{
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Invalidate();
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}
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}
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protected override SKSize MeasureOverride(SKSize availableSize)
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{
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return new SKSize(Size + StrokeWidth * 2, Size + StrokeWidth * 2);
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}
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}
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