From ef20e2c071cf0fdd4119a215faccf74fbabcfae4 Mon Sep 17 00:00:00 2001
From: tye-exe <tye@mailbox.org>
Date: Sun, 25 May 2025 09:43:35 +0100
Subject: [PATCH] Split "disabling" and "graying out".

Split these two behaviours into different functions, as either behaviour is sometimes desirable.
---
 crates/egui/src/style.rs | 17 +++++++++++++----
 crates/egui/src/ui.rs    |  4 ++--
 2 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/crates/egui/src/style.rs b/crates/egui/src/style.rs
index 21dfb85a6..43254d531 100644
--- a/crates/egui/src/style.rs
+++ b/crates/egui/src/style.rs
@@ -1019,7 +1019,7 @@ pub struct Visuals {
     /// How to display numeric color values.
     pub numeric_color_space: NumericColorSpace,
 
-    /// Opacity is multiplied by this amount when fading out widgets.
+    /// How much to modify the alpha of a disabled widget.
     pub disabled_alpha: f32,
 }
 
@@ -1055,17 +1055,26 @@ impl Visuals {
         self.window_stroke
     }
 
-    /// When fading out things, we multiply the opacity by this.
+    /// Disabled widgets have their alpha modified by this.
     #[inline(always)]
     pub fn disabled_alpha(&self) -> f32 {
         self.disabled_alpha
     }
 
-    /// Returned a "grayed out" version of the given color.
+    /// Returns a "disabled" version of the given color.
+    ///
+    /// This function modifies the opcacity of the given color.
+    /// If this is undesirable use [`gray_out`](Self::gray_out).
+    #[inline(always)]
+    pub fn disable(&self, color: Color32) -> Color32 {
+        color.gamma_multiply(self.disabled_alpha())
+    }
+
+    /// Returns a "grayed out" version of the given color.
     #[doc(alias = "grey_out")]
     #[inline(always)]
     pub fn gray_out(&self, color: Color32) -> Color32 {
-        color.gamma_multiply(self.disabled_alpha())
+        crate::ecolor::tint_color_towards(color, self.widgets.noninteractive.weak_bg_fill)
     }
 }
 
diff --git a/crates/egui/src/ui.rs b/crates/egui/src/ui.rs
index c088f8070..06e798975 100644
--- a/crates/egui/src/ui.rs
+++ b/crates/egui/src/ui.rs
@@ -2963,8 +2963,8 @@ impl Ui {
 
         if is_anything_being_dragged && !can_accept_what_is_being_dragged {
             // When dragging something else, show that it can't be dropped here:
-            fill = self.visuals().gray_out(fill);
-            stroke.color = self.visuals().gray_out(stroke.color);
+            fill = self.visuals().disable(fill);
+            stroke.color = self.visuals().disable(stroke.color);
         }
 
         frame.frame.fill = fill;