From ff94ab4192ed54ea09de0107c3ae7993a41a9362 Mon Sep 17 00:00:00 2001
From: Antoine C <hi@acolombier.dev>
Date: Sat, 7 Sep 2024 01:59:18 +0100
Subject: [PATCH] feat: allow toggler to be disabled

---
 style/src/theme.rs    | 31 +++++++++++++++++++++++++++++++
 style/src/toggler.rs  |  5 +++++
 widget/src/helpers.rs |  2 +-
 widget/src/toggler.rs | 14 ++++++++------
 4 files changed, 45 insertions(+), 7 deletions(-)

diff --git a/style/src/theme.rs b/style/src/theme.rs
index de7c2c7b5a..0652994eb4 100644
--- a/style/src/theme.rs
+++ b/style/src/theme.rs
@@ -745,6 +745,37 @@ impl toggler::StyleSheet for Theme {
         }
     }
 
+    fn disabled(
+        &self,
+        style: &Self::Style,
+        is_active: bool,
+    ) -> toggler::Appearance {
+        match style {
+            Toggler::Default => {
+                let palette = self.extended_palette();
+
+                toggler::Appearance {
+                    background: if is_active {
+                        palette.primary.strong.color
+                    } else {
+                        palette.background.strong.color
+                    },
+                    background_border: None,
+                    foreground: if is_active {
+                        palette.primary.strong.text
+                    } else {
+                        palette.background.base.color
+                    },
+                    foreground_border: None,
+                    border_radius: Radius::from(8.0),
+                    handle_radius: Radius::from(8.0),
+                    handle_margin: 2.0,
+                }
+            }
+            Toggler::Custom(custom) => custom.active(self, is_active),
+        }
+    }
+
     fn hovered(
         &self,
         style: &Self::Style,
diff --git a/style/src/toggler.rs b/style/src/toggler.rs
index 81c615fb2d..ff0dc0f3be 100644
--- a/style/src/toggler.rs
+++ b/style/src/toggler.rs
@@ -34,4 +34,9 @@ pub trait StyleSheet {
     ///
     /// [`Style`]: Self::Style
     fn hovered(&self, style: &Self::Style, is_active: bool) -> Appearance;
+
+    /// Returns the disabled [`Appearance`] of the toggler for the provided [`Style`].
+    ///
+    /// [`Style`]: Self::Style
+    fn disabled(&self, style: &Self::Style, is_active: bool) -> Appearance;
 }
diff --git a/widget/src/helpers.rs b/widget/src/helpers.rs
index bfc8abea91..75b0d03a05 100644
--- a/widget/src/helpers.rs
+++ b/widget/src/helpers.rs
@@ -202,7 +202,7 @@ where
     Renderer: core::text::Renderer,
     Theme: toggler::StyleSheet,
 {
-    Toggler::new(label, is_checked, f)
+    Toggler::new(label, is_checked, Some(f))
 }
 
 /// Creates a new [`TextInput`].
diff --git a/widget/src/toggler.rs b/widget/src/toggler.rs
index 20d34bf2d5..1c16150903 100644
--- a/widget/src/toggler.rs
+++ b/widget/src/toggler.rs
@@ -53,7 +53,7 @@ pub struct Toggler<
     #[cfg(feature = "a11y")]
     labeled_by_widget: Option<Vec<iced_accessibility::accesskit::NodeId>>,
     is_toggled: bool,
-    on_toggle: Box<dyn Fn(bool) -> Message + 'a>,
+    on_toggle: Option<Box<dyn Fn(bool) -> Message + 'a>>,
     label: Option<String>,
     width: Length,
     size: f32,
@@ -86,7 +86,7 @@ where
     pub fn new<F>(
         label: impl Into<Option<String>>,
         is_toggled: bool,
-        f: F,
+        f: Option<F>,
     ) -> Self
     where
         F: 'a + Fn(bool) -> Message,
@@ -103,7 +103,7 @@ where
             #[cfg(feature = "a11y")]
             labeled_by_widget: None,
             is_toggled,
-            on_toggle: Box::new(f),
+            on_toggle: if f.is_some() { Some(Box::new(f.unwrap())) } else { None },
             label,
             width: Length::Fill,
             size: Self::DEFAULT_SIZE,
@@ -296,8 +296,8 @@ where
             | Event::Touch(touch::Event::FingerPressed { .. }) => {
                 let mouse_over = cursor.is_over(layout.bounds());
 
-                if mouse_over {
-                    shell.publish((self.on_toggle)(!self.is_toggled));
+                if self.on_toggle.is_some() && mouse_over {
+                    shell.publish((self.on_toggle.as_ref().unwrap())(!self.is_toggled));
 
                     event::Status::Captured
                 } else {
@@ -352,7 +352,9 @@ where
         let bounds = toggler_layout.bounds();
         let is_mouse_over = cursor.is_over(layout.bounds());
 
-        let style = if is_mouse_over {
+        let style = if self.on_toggle.is_none() {
+            theme.disabled(&self.style, self.is_toggled)
+        } else if is_mouse_over {
             theme.hovered(&self.style, self.is_toggled)
         } else {
             theme.active(&self.style, self.is_toggled)