From 6385799d61b64c4ff17b58d2d78211d6ebc74630 Mon Sep 17 00:00:00 2001
From: ickshonpe <david.curthoys@googlemail.com>
Date: Thu, 20 Apr 2023 12:03:18 +0100
Subject: [PATCH] Revert "changes:"

This reverts commit 96903e54ee48df58a98f5110fece4d6edfb75dc0.
---
 crates/bevy_ui/src/layout/mod.rs  | 23 ++++++++++++-----------
 crates/bevy_ui/src/measurement.rs | 24 +++++++++++-------------
 2 files changed, 23 insertions(+), 24 deletions(-)

diff --git a/crates/bevy_ui/src/layout/mod.rs b/crates/bevy_ui/src/layout/mod.rs
index 9cab3506518ab..4429a73511f6d 100644
--- a/crates/bevy_ui/src/layout/mod.rs
+++ b/crates/bevy_ui/src/layout/mod.rs
@@ -17,7 +17,11 @@ use bevy_transform::components::Transform;
 use bevy_utils::HashMap;
 use bevy_window::{PrimaryWindow, Window, WindowResolution, WindowScaleFactorChanged};
 use std::fmt;
-use taffy::{node::Measurable, prelude::Size, style_helpers::TaffyMaxContent, Taffy};
+use taffy::{
+    prelude::Size,
+    style_helpers::TaffyMaxContent,
+    Taffy,
+};
 
 pub struct LayoutContext {
     pub scale_factor: f64,
@@ -87,14 +91,11 @@ impl UiSurface {
         }
     }
 
-    pub fn update_measure(&mut self, entity: Entity, measure_func: Box<dyn Measurable>) {
-        let taffy_node = self.entity_to_taffy.get(&entity).unwrap();
-        self.taffy
-            .set_measure(
-                *taffy_node,
-                Some(taffy::node::MeasureFunc::Boxed(measure_func)),
-            )
-            .ok();
+    pub fn update_measure(&mut self, entity: Entity, content_size: &mut ContentSize) {
+        if let Some(measure_func) = content_size.measure_func.take() {
+            let taffy_node = self.entity_to_taffy.get(&entity).unwrap();
+            self.taffy.set_measure(*taffy_node, Some(taffy::node::MeasureFunc::Boxed(measure_func))).ok();
+        }
     }
 
     pub fn update_children(&mut self, entity: Entity, children: &Children) {
@@ -266,8 +267,8 @@ pub fn ui_layout_system(
     }
 
     for (entity, mut content_size) in measure_query.iter_mut() {
-        if let Some(measure_func) = content_size.measure_func.take() {
-            ui_surface.update_measure(entity, measure_func);
+        if content_size.is_changed() {
+            ui_surface.update_measure(entity, &mut content_size);
         }
     }
 
diff --git a/crates/bevy_ui/src/measurement.rs b/crates/bevy_ui/src/measurement.rs
index a41bb4c851e7a..45eceb2a830f8 100644
--- a/crates/bevy_ui/src/measurement.rs
+++ b/crates/bevy_ui/src/measurement.rs
@@ -2,8 +2,8 @@ use bevy_ecs::prelude::Component;
 use bevy_ecs::reflect::ReflectComponent;
 use bevy_math::Vec2;
 use bevy_reflect::Reflect;
-use std::fmt::Formatter;
 use taffy::node::Measurable;
+use std::fmt::Formatter;
 pub use taffy::style::AvailableSpace;
 
 impl std::fmt::Debug for ContentSize {
@@ -51,23 +51,20 @@ impl Measure for FixedMeasure {
 pub struct ContentSize {
     /// The `Measure` used to compute the intrinsic size
     #[reflect(ignore)]
-    pub(crate) measure_func: Option<Box<dyn Measurable>>,
+    pub (crate) measure_func: Option<Box<dyn Measurable>>,
 }
 
 impl ContentSize {
     pub fn new(measure: impl Measure) -> Self {
-        let measure_func =
-            move |size: taffy::prelude::Size<Option<f32>>,
-                  available: taffy::prelude::Size<AvailableSpace>| {
-                let size =
-                    measure.measure(size.width, size.height, available.width, available.height);
-                taffy::prelude::Size {
-                    width: size.x,
-                    height: size.y,
-                }
-            };
+        let measure_func = move |size: taffy::prelude::Size<Option<f32>>, available: taffy::prelude::Size<AvailableSpace>| {
+            let size = measure.measure(size.width, size.height, available.width, available.height);
+            taffy::prelude::Size {
+                width: size.x,
+                height: size.y,
+            }
+        };
         Self {
-            measure_func: Some(Box::new(measure_func)),
+            measure_func: Some(Box::new(measure_func))
         }
     }
 }
@@ -78,3 +75,4 @@ impl Default for ContentSize {
         Self::new(FixedMeasure::default())
     }
 }
+