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

using Avalonia;
using Avalonia.Controls;
using Avalonia.Media;
using YZWater.Core.Utils;

namespace YZWater.Avalonia.Controls;

/// <summary>
/// 自适应容器控件 - 根据窗口大小自动缩放内容
/// </summary>
public class AdaptiveContainer : Decorator
{
    public static readonly StyledProperty<double> DesignWidthProperty =
        AvaloniaProperty.Register<AdaptiveContainer, double>(nameof(DesignWidth), ResolutionManager.DesignWidth);

    public static readonly StyledProperty<double> DesignHeightProperty =
        AvaloniaProperty.Register<AdaptiveContainer, double>(nameof(DesignHeight), ResolutionManager.DesignHeight);

    public static readonly StyledProperty<bool> MaintainAspectRatioProperty =
        AvaloniaProperty.Register<AdaptiveContainer, bool>(nameof(MaintainAspectRatio), true);

    public static readonly StyledProperty<Stretch> StretchProperty =
        AvaloniaProperty.Register<AdaptiveContainer, Stretch>(nameof(Stretch), Stretch.Uniform);

    public static readonly StyledProperty<double> MinScaleProperty =
        AvaloniaProperty.Register<AdaptiveContainer, double>(nameof(MinScale), 0.5);

    public static readonly StyledProperty<double> MaxScaleProperty =
        AvaloniaProperty.Register<AdaptiveContainer, double>(nameof(MaxScale), 2.0);

    public double DesignWidth
    {
        get => GetValue(DesignWidthProperty);
        set => SetValue(DesignWidthProperty, value);
    }

    public double DesignHeight
    {
        get => GetValue(DesignHeightProperty);
        set => SetValue(DesignHeightProperty, value);
    }

    public bool MaintainAspectRatio
    {
        get => GetValue(MaintainAspectRatioProperty);
        set => SetValue(MaintainAspectRatioProperty, value);
    }

    public Stretch Stretch
    {
        get => GetValue(StretchProperty);
        set => SetValue(StretchProperty, value);
    }

    public double MinScale
    {
        get => GetValue(MinScaleProperty);
        set => SetValue(MinScaleProperty, value);
    }

    public double MaxScale
    {
        get => GetValue(MaxScaleProperty);
        set => SetValue(MaxScaleProperty, value);
    }

    static AdaptiveContainer()
    {
        AffectsMeasure<AdaptiveContainer>(DesignWidthProperty, DesignHeightProperty, MaintainAspectRatioProperty, StretchProperty, MinScaleProperty, MaxScaleProperty);
        AffectsArrange<AdaptiveContainer>(DesignWidthProperty, DesignHeightProperty, MaintainAspectRatioProperty, StretchProperty, MinScaleProperty, MaxScaleProperty);
    }

    protected override Size MeasureOverride(Size availableSize)
    {
        var child = Child;
        if (child == null)
        {
            return new Size(0, 0);
        }

        // 让子元素按照设计尺寸测量
        var designSize = new Size(DesignWidth, DesignHeight);
        child.Measure(designSize);

        // 计算可用空间
        var availableWidth = availableSize.Width;
        var availableHeight = availableSize.Height;

        // 如果可用空间是无限的，使用设计尺寸
        if (double.IsInfinity(availableWidth))
        {
            availableWidth = DesignWidth;
        }
        if (double.IsInfinity(availableHeight))
        {
            availableHeight = DesignHeight;
        }

        // 返回可用空间（实际缩放在 Arrange 阶段处理）
        return new Size(availableWidth, availableHeight);
    }

    protected override Size ArrangeOverride(Size finalSize)
    {
        var child = Child;
        if (child == null)
        {
            return finalSize;
        }

        // 计算缩放比例
        var scaleX = finalSize.Width / DesignWidth;
        var scaleY = finalSize.Height / DesignHeight;

        var scale = Stretch switch
        {
            Stretch.Fill => new ScaleTransform(scaleX, scaleY),
            Stretch.Uniform => new ScaleTransform(Math.Min(scaleX, scaleY), Math.Min(scaleX, scaleY)),
            Stretch.UniformToFill => new ScaleTransform(Math.Max(scaleX, scaleY), Math.Max(scaleX, scaleY)),
            _ => new ScaleTransform(1, 1)
        };

        // 限制缩放范围
        var uniformScale = Math.Max(MinScale, Math.Min(MaxScale, scale.ScaleX));

        // 更新分辨率管理器
        ResolutionManager.Instance.UpdateResolution(finalSize.Width, finalSize.Height);

        // 计算实际尺寸
        var actualWidth = DesignWidth * uniformScale;
        var actualHeight = DesignHeight * uniformScale;

        // 计算居中偏移
        var offsetX = (finalSize.Width - actualWidth) / 2;
        var offsetY = (finalSize.Height - actualHeight) / 2;

        // 应用变换
        child.RenderTransform = new ScaleTransform(uniformScale, uniformScale);
        child.RenderTransformOrigin = new RelativePoint(0, 0, RelativeUnit.Absolute);

        // 排列子元素
        child.Arrange(new Rect(offsetX, offsetY, DesignWidth, DesignHeight));

        return finalSize;
    }
}