From b63326e9ac4c08be051498a85015f41aa490450a Mon Sep 17 00:00:00 2001
From: ickshonpe <david.curthoys@googlemail.com>
Date: Sat, 28 Oct 2023 17:04:04 +0100
Subject: [PATCH] Implement `Neg` for `Val` (#10295)

# Objective

Implement `Neg` for `Val`
---
 crates/bevy_ui/src/geometry.rs | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/crates/bevy_ui/src/geometry.rs b/crates/bevy_ui/src/geometry.rs
index 734fcd65c62aa..9462ef4e770d5 100644
--- a/crates/bevy_ui/src/geometry.rs
+++ b/crates/bevy_ui/src/geometry.rs
@@ -4,6 +4,7 @@ use bevy_reflect::ReflectDeserialize;
 use bevy_reflect::ReflectSerialize;
 use serde::Deserialize;
 use serde::Serialize;
+use std::ops::Neg;
 use std::ops::{Div, DivAssign, Mul, MulAssign};
 use thiserror::Error;
 
@@ -154,6 +155,22 @@ impl DivAssign<f32> for Val {
     }
 }
 
+impl Neg for Val {
+    type Output = Val;
+
+    fn neg(self) -> Self::Output {
+        match self {
+            Val::Px(value) => Val::Px(-value),
+            Val::Percent(value) => Val::Percent(-value),
+            Val::Vw(value) => Val::Vw(-value),
+            Val::Vh(value) => Val::Vh(-value),
+            Val::VMin(value) => Val::VMin(-value),
+            Val::VMax(value) => Val::VMax(-value),
+            _ => self,
+        }
+    }
+}
+
 #[derive(Debug, Eq, PartialEq, Clone, Copy, Error)]
 pub enum ValArithmeticError {
     #[error("the variants of the Vals don't match")]