com.unity.uiwidgets/com.unity.uiwidgets/Runtime/material/popup_menu_theme.cs

using System;
using Unity.UIWidgets.foundation;
using Unity.UIWidgets.painting;
using Unity.UIWidgets.ui;
using Unity.UIWidgets.widgets;
using UnityEngine;
using Color = Unity.UIWidgets.ui.Color;
using TextStyle = Unity.UIWidgets.painting.TextStyle;

namespace Unity.UIWidgets.material {
    public class PopupMenuThemeData : Diagnosticable, IEquatable<PopupMenuThemeData> {
        public PopupMenuThemeData(
            Color color = null,
            ShapeBorder shape = null,
            float? elevation = null,
            TextStyle textStyle = null
        ) {
            this.color = color;
            this.shape = shape;
            this.elevation = elevation;
            this.textStyle = textStyle;
        }

        public readonly Color color;

        public readonly ShapeBorder shape;

        public readonly float? elevation;

        public readonly TextStyle textStyle;

        PopupMenuThemeData copyWith(
            Color color = null,
            ShapeBorder shape = null,
            float? elevation = null,
            TextStyle textStyle = null
        ) {
            return new PopupMenuThemeData(
                color: color ?? this.color,
                shape: shape ?? this.shape,
                elevation: elevation ?? this.elevation,
                textStyle: textStyle ?? this.textStyle
            );
        }

        public static PopupMenuThemeData lerp(PopupMenuThemeData a, PopupMenuThemeData b, float t) {
            if (a == null && b == null)
                return null;
            return new PopupMenuThemeData(
                color: Color.lerp(a?.color, b?.color, t),
                shape: ShapeBorder.lerp(a?.shape, b?.shape, t),
                elevation: MathUtils.lerpNullableFloat(a?.elevation, b?.elevation, t),
                textStyle: TextStyle.lerp(a?.textStyle, b?.textStyle, t)
            );
        }


        public override void debugFillProperties(DiagnosticPropertiesBuilder properties) {
            base.debugFillProperties(properties);
            properties.add(new ColorProperty("color", color, defaultValue: null));
            properties.add(new DiagnosticsProperty<ShapeBorder>("shape", shape, defaultValue: null));
            properties.add(new FloatProperty("elevation", elevation, defaultValue: null));
            properties.add(new DiagnosticsProperty<TextStyle>("text style", textStyle, defaultValue: null));
        }

        public static bool operator ==(PopupMenuThemeData self, PopupMenuThemeData other) {
            return Equals(self, other);
        }

        public static bool operator !=(PopupMenuThemeData self, PopupMenuThemeData other) {
            return !Equals(self, other);
        }

        public bool Equals(PopupMenuThemeData other) {
            if (ReferenceEquals(null, other)) {
                return false;
            }

            if (ReferenceEquals(this, other)) {
                return true;
            }

            return Equals(color, other.color) && Equals(shape, other.shape) &&
                   Nullable.Equals(elevation, other.elevation) && Equals(textStyle, other.textStyle);
        }

        public override bool Equals(object obj) {
            if (ReferenceEquals(null, obj)) {
                return false;
            }

            if (ReferenceEquals(this, obj)) {
                return true;
            }

            if (obj.GetType() != GetType()) {
                return false;
            }

            return Equals((PopupMenuThemeData) obj);
        }

        public override int GetHashCode() {
            unchecked {
                var hashCode = (color != null ? color.GetHashCode() : 0);
                hashCode = (hashCode * 397) ^ (shape != null ? shape.GetHashCode() : 0);
                hashCode = (hashCode * 397) ^ elevation.GetHashCode();
                hashCode = (hashCode * 397) ^ (textStyle != null ? textStyle.GetHashCode() : 0);
                return hashCode;
            }
        }
    }

    public class PopupMenuTheme : InheritedTheme {
        public PopupMenuTheme(
            Key key = null,
            PopupMenuThemeData data = null,
            Widget child = null
        ) : base(key: key, child: child) {
            D.assert(data != null);
        }

        public readonly PopupMenuThemeData data;

        public static PopupMenuThemeData of(BuildContext context) {
            PopupMenuTheme popupMenuTheme = context.dependOnInheritedWidgetOfExactType<PopupMenuTheme>();
            return popupMenuTheme?.data ?? Theme.of(context).popupMenuTheme;
        }

        public override Widget wrap(BuildContext context, Widget child) {
            PopupMenuTheme ancestorTheme = context.findAncestorWidgetOfExactType<PopupMenuTheme>();
            return ReferenceEquals(this, ancestorTheme) ? child : new PopupMenuTheme(data: data, child: child);
        }

        public override bool updateShouldNotify(InheritedWidget oldWidget) =>
            oldWidget is PopupMenuTheme popupMenuTheme && data != popupMenuTheme.data;
    }
}