YZWater3/src/YZWater.Avalonia/Controls/WaterTankControl.cs

using Avalonia;
using Avalonia.Controls;
using Avalonia.Media;
using System;
using System.Globalization;

namespace YZWater.Avalonia.Controls;

public class WaterTankControl : Control
{
    public static readonly StyledProperty<double> WaterLevelProperty =
        AvaloniaProperty.Register<WaterTankControl, double>(nameof(WaterLevel), 50.0);
    public static readonly StyledProperty<string> TextProperty =
        AvaloniaProperty.Register<WaterTankControl, string>(nameof(Text), string.Empty);
    public static readonly StyledProperty<IBrush> WaterColorProperty =
        AvaloniaProperty.Register<WaterTankControl, IBrush>(nameof(WaterColor));
    public static readonly StyledProperty<IBrush> BorderColorProperty =
        AvaloniaProperty.Register<WaterTankControl, IBrush>(nameof(BorderColor));

    public double WaterLevel { get => GetValue(WaterLevelProperty); set => SetValue(WaterLevelProperty, value); }
    public string Text { get => GetValue(TextProperty); set => SetValue(TextProperty, value); }
    public IBrush WaterColor { get => GetValue(WaterColorProperty); set => SetValue(WaterColorProperty, value); }
    public IBrush BorderColor { get => GetValue(BorderColorProperty); set => SetValue(BorderColorProperty, value); }

    static WaterTankControl() { AffectsRender<WaterTankControl>(WaterLevelProperty, TextProperty, WaterColorProperty, BorderColorProperty); }

    protected override void OnAttachedToVisualTree(VisualTreeAttachmentEventArgs e)
    {
        base.OnAttachedToVisualTree(e);
        ThemeHelper.ThemeChanged += OnThemeChanged;
    }

    protected override void OnDetachedFromVisualTree(VisualTreeAttachmentEventArgs e)
    {
        ThemeHelper.ThemeChanged -= OnThemeChanged;
        base.OnDetachedFromVisualTree(e);
    }

    private void OnThemeChanged() => InvalidateVisual();

    private static readonly Typeface s_typeface = new("Microsoft YaHei", FontStyle.Normal, FontWeight.Bold);

    public override void Render(DrawingContext context)
    {
        base.Render(context);
        var bounds = new Rect(Bounds.Size);
        var edgeWidth = 3.0;

        context.DrawRectangle(ThemeHelper.PanelBg, null, bounds);
        var borderColor = BorderColor ?? ThemeHelper.Border;
        context.DrawRectangle(null, new Pen(borderColor, edgeWidth), bounds);

        var waterHeight = (bounds.Height - edgeWidth * 2) * Math.Max(0, Math.Min(100, WaterLevel)) / 100.0;
        if (waterHeight > 0)
        {
            var waterColor = WaterColor ?? ThemeHelper.Success;
            var waterBrush = waterColor is SolidColorBrush sc ? new SolidColorBrush(sc.Color, 0.8) : waterColor;
            context.DrawRectangle(waterBrush, null, new Rect(bounds.X + edgeWidth, bounds.Y + bounds.Height - edgeWidth - waterHeight, bounds.Width - edgeWidth * 2, waterHeight));
        }

        if (!string.IsNullOrEmpty(Text))
        {
            var t = new FormattedText(Text, CultureInfo.CurrentCulture, FlowDirection.LeftToRight, s_typeface, 12, ThemeHelper.TextPrimary);
            context.DrawText(t, new Point(bounds.X + (bounds.Width - t.Width) / 2, bounds.Y + edgeWidth + 5));
        }

        var lt = new FormattedText($"{WaterLevel:F1}%", CultureInfo.CurrentCulture, FlowDirection.LeftToRight, s_typeface, 14, ThemeHelper.TextPrimary);
        var bg = new Rect(bounds.X + (bounds.Width - lt.Width - 10) / 2, bounds.Y + bounds.Height - edgeWidth - lt.Height - 10, lt.Width + 10, lt.Height + 6);
        context.DrawRectangle(new SolidColorBrush(Colors.Black, 0.5), null, bg);
        context.DrawText(lt, new Point(bg.X + 5, bg.Y + 3));
    }

    protected override Size MeasureOverride(Size availableSize) => new Size(120, 160);
}