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

using System;
using Unity.UIWidgets.foundation;
using Unity.UIWidgets.painting;
using Unity.UIWidgets.rendering;
using Unity.UIWidgets.ui;
using Unity.UIWidgets.widgets;

namespace Unity.UIWidgets.material {
    public class ButtonBarThemeData : Diagnosticable, IEquatable<ButtonBarThemeData> {
        public ButtonBarThemeData(
            MainAxisAlignment? alignment = null,
            MainAxisSize? mainAxisSize = null,
            ButtonTextTheme? buttonTextTheme = null,
            float? buttonMinWidth = null,
            float? buttonHeight = null,
            EdgeInsetsGeometry buttonPadding = null,
            bool? buttonAlignedDropdown = null,
            ButtonBarLayoutBehavior? layoutBehavior = null,
            VerticalDirection? overflowDirection = null
        ) {
            D.assert(buttonMinWidth == null || buttonMinWidth >= 0.0f);
            D.assert(buttonHeight == null || buttonHeight >= 0.0f);
            this.alignment = alignment;
            this.mainAxisSize = mainAxisSize;
            this.buttonTextTheme = buttonTextTheme;
            this.buttonMinWidth = buttonMinWidth;
            this.buttonHeight = buttonHeight;
            this.buttonPadding = buttonPadding;
            this.buttonAlignedDropdown = buttonAlignedDropdown;
            this.layoutBehavior = layoutBehavior;
            this.overflowDirection = overflowDirection;
        }

        public readonly MainAxisAlignment? alignment;

        public readonly MainAxisSize? mainAxisSize;

        public readonly ButtonTextTheme? buttonTextTheme;

        public readonly float? buttonMinWidth;

        public readonly float? buttonHeight;

        public readonly EdgeInsetsGeometry buttonPadding;

        public readonly bool? buttonAlignedDropdown;

        public readonly ButtonBarLayoutBehavior? layoutBehavior;

        public readonly VerticalDirection? overflowDirection;

        public ButtonBarThemeData copyWith(
            MainAxisAlignment? alignment,
            MainAxisSize? mainAxisSize,
            ButtonTextTheme? buttonTextTheme,
            float? buttonMinWidth,
            float? buttonHeight,
            EdgeInsetsGeometry buttonPadding,
            bool? buttonAlignedDropdown,
            ButtonBarLayoutBehavior? layoutBehavior,
            VerticalDirection? overflowDirection
        ) {
            return new ButtonBarThemeData(
                alignment: alignment ?? this.alignment,
                mainAxisSize: mainAxisSize ?? this.mainAxisSize,
                buttonTextTheme: buttonTextTheme ?? this.buttonTextTheme,
                buttonMinWidth: buttonMinWidth ?? this.buttonMinWidth,
                buttonHeight: buttonHeight ?? this.buttonHeight,
                buttonPadding: buttonPadding ?? this.buttonPadding,
                buttonAlignedDropdown: buttonAlignedDropdown ?? this.buttonAlignedDropdown,
                layoutBehavior: layoutBehavior ?? this.layoutBehavior,
                overflowDirection: overflowDirection ?? this.overflowDirection
            );
        }

        public static ButtonBarThemeData lerp(ButtonBarThemeData a, ButtonBarThemeData b, float t) {
            if (a == null && b == null)
                return null;
            return new ButtonBarThemeData(
                alignment: t < 0.5 ? a.alignment : b.alignment,
                mainAxisSize: t < 0.5 ? a.mainAxisSize : b.mainAxisSize,
                buttonTextTheme: t < 0.5 ? a.buttonTextTheme : b.buttonTextTheme,
                buttonMinWidth: MathUtils.lerpNullableFloat(a?.buttonMinWidth, b?.buttonMinWidth, t),
                buttonHeight: MathUtils.lerpNullableFloat(a?.buttonHeight, b?.buttonHeight, t),
                buttonPadding: EdgeInsetsGeometry.lerp(a?.buttonPadding, b?.buttonPadding, t),
                buttonAlignedDropdown: t < 0.5 ? a.buttonAlignedDropdown : b.buttonAlignedDropdown,
                layoutBehavior: t < 0.5 ? a.layoutBehavior : b.layoutBehavior,
                overflowDirection: t < 0.5 ? a.overflowDirection : b.overflowDirection
            );
        }

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

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

            return alignment == other.alignment && mainAxisSize == other.mainAxisSize &&
                   buttonTextTheme == other.buttonTextTheme && buttonMinWidth.Equals(other.buttonMinWidth) &&
                   buttonHeight.Equals(other.buttonHeight) && Equals(buttonPadding, other.buttonPadding) &&
                   buttonAlignedDropdown == other.buttonAlignedDropdown && layoutBehavior == other.layoutBehavior &&
                   overflowDirection == other.overflowDirection;
        }

        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((ButtonBarThemeData) obj);
        }

        public override int GetHashCode() {
            unchecked {
                var hashCode = (int) (alignment ?? 0);
                hashCode = (hashCode * 397) ^ (int) (mainAxisSize ?? 0);
                hashCode = (hashCode * 397) ^ (int) (buttonTextTheme ?? 0);
                hashCode = (hashCode * 397) ^ (buttonMinWidth?.GetHashCode() ?? 0);
                hashCode = (hashCode * 397) ^ (buttonHeight?.GetHashCode() ?? 0);
                hashCode = (hashCode * 397) ^ (buttonPadding != null ? buttonPadding.GetHashCode() : 0);
                hashCode = (hashCode * 397) ^ (buttonAlignedDropdown?.GetHashCode() ?? 0);
                hashCode = (hashCode * 397) ^ (int) (layoutBehavior ?? 0);
                hashCode = (hashCode * 397) ^ (int) (overflowDirection ?? 0);
                return hashCode;
            }
        }

        public override void debugFillProperties(DiagnosticPropertiesBuilder properties) {
            base.debugFillProperties(properties);
            properties.add(new DiagnosticsProperty<MainAxisAlignment?>("alignment", alignment, defaultValue: null));
            properties.add(new DiagnosticsProperty<MainAxisSize?>("mainAxisSize", mainAxisSize, defaultValue: null));
            properties.add(new DiagnosticsProperty<ButtonTextTheme?>("textTheme", buttonTextTheme, defaultValue: null));
            properties.add(new FloatProperty("minWidth", buttonMinWidth, defaultValue: null));
            properties.add(new FloatProperty("height", buttonHeight, defaultValue: null));
            properties.add(new DiagnosticsProperty<EdgeInsetsGeometry>("padding", buttonPadding, defaultValue: null));
            properties.add(new FlagProperty(
                "buttonAlignedDropdown",
                value: buttonAlignedDropdown,
                ifTrue: "dropdown width matches button",
                defaultValue: null));
            properties.add(
                new DiagnosticsProperty<ButtonBarLayoutBehavior?>("layoutBehavior", layoutBehavior,
                    defaultValue: null));
            properties.add(new DiagnosticsProperty<VerticalDirection?>("overflowDirection", overflowDirection,
                defaultValue: null));
        }
    }

    public class ButtonBarTheme : InheritedWidget {
        public ButtonBarTheme(
            Key key = null,
            ButtonBarThemeData data = null,
            Widget child = null
        ) : base(key: key, child: child) {
            D.assert(data != null);
            this.data = data;
        }

        public readonly ButtonBarThemeData data;

        public static ButtonBarThemeData of(BuildContext context) {
            ButtonBarTheme buttonBarTheme = context.dependOnInheritedWidgetOfExactType<ButtonBarTheme>();
            return buttonBarTheme?.data ?? Theme.of(context).buttonBarTheme;
        }

        public override bool updateShouldNotify(InheritedWidget oldWidget) {
            return oldWidget is ButtonBarTheme buttonBarTheme && !data.Equals(buttonBarTheme.data);
        }
    }
}