refactor improve types and simplified usage

README.md

@@ -112,6 +112,17 @@ Enable this widget with the feature `number_input`.
 
 *This widget does currently not support web*
 
+### SelectionList
+
+A selection space to show any options passed in.
+
+<div align="center">
+
+![SelectionList showcase](./images/showcase/selection_list.gif)
+</div>
+
+Enable this widget with the feature `selection_list`.
+
 ### Split
 
 A split divides the available space to display two different elements.

examples/selection_list/src/main.rs

@@ -18,7 +18,7 @@ struct Example {
 
 #[derive(Debug, Clone)]
 enum Message {
-    LanguageSelected((usize, String)),
+    LanguageSelected(usize, String),
     AddAtSelection,
     ManualSelection,
 }
@@ -45,7 +45,7 @@ impl Sandbox for Example {
 
     fn update(&mut self, message: Message) {
         match message {
-            Message::LanguageSelected((index, language)) => {
+            Message::LanguageSelected(index, language) => {
                 self.selected_language = language;
                 self.selected_index = index;
                 self.manual_select = None;

src/native/helpers.rs

@@ -298,13 +298,14 @@ where
 }
 
 #[cfg(feature = "selection_list")]
+use std::fmt::Display;
 /// Shortcut helper to create a [`SelectionList`] Widget.
 ///
 /// [`SelectionList`]: crate::SelectionList
 #[must_use]
 pub fn selection_list_with<'a, T, Message, Renderer>(
-    options: impl Into<Cow<'a, [T]>>,
-    on_selected: impl Fn((usize, T)) -> Message + 'static,
+    options: &'a [T],
+    on_selected: impl Fn(usize, T) -> Message + 'static,
     text_size: f32,
     padding: f32,
     style: <Renderer::Theme as crate::style::selection_list::StyleSheet>::Style,
@@ -317,7 +318,7 @@ where
     Renderer::Theme: crate::style::selection_list::StyleSheet
         + iced_widget::container::StyleSheet
         + iced_widget::scrollable::StyleSheet,
-    T: Clone + ToString + Eq + Hash,
+    T: Clone + Display + Eq + Hash,
     [T]: ToOwned<Owned = Vec<T>>,
 {
     crate::SelectionList::new_with(
@@ -337,16 +338,16 @@ where
 /// [`SelectionList`]: crate::SelectionList
 #[must_use]
 pub fn selection_list<'a, T, Message, Renderer>(
-    options: impl Into<Cow<'a, [T]>>,
-    on_selected: impl Fn((usize, T)) -> Message + 'static,
+    options: &'a [T],
+    on_selected: impl Fn(usize, T) -> Message + 'static,
 ) -> crate::SelectionList<'a, T, Message, Renderer>
 where
     Message: 'a + Clone,
     Renderer: 'a + core::Renderer + core::text::Renderer<Font = core::Font>,
     Renderer::Theme: crate::style::selection_list::StyleSheet
         + iced_widget::container::StyleSheet
         + iced_widget::scrollable::StyleSheet,
-    T: Clone + ToString + Eq + Hash,
+    T: Clone + Display + Eq + Hash,
     [T]: ToOwned<Owned = Vec<T>>,
 {
     crate::SelectionList::new(options, on_selected)

src/native/selection_list.rs

@@ -19,8 +19,8 @@ use iced_widget::{
 };
 
 pub use list::List;
-use std::marker::PhantomData;
-use std::{borrow::Cow, hash::Hash};
+use std::hash::Hash;
+use std::{fmt::Display, marker::PhantomData};
 
 /// A widget for selecting a single value from a dynamic scrollable list of options.
 #[allow(missing_debug_implementations)]
@@ -35,7 +35,7 @@ where
     /// Container for Rendering List.
     container: Container<'a, Message, Renderer>,
     /// List of Elements to Render.
-    options: Cow<'a, [T]>,
+    options: &'a [T],
     /// Label Font
     font: Renderer::Font,
     /// The Containers Width
@@ -56,20 +56,16 @@ where
     Message: 'a + Clone,
     Renderer: 'a + core::Renderer + core::text::Renderer<Font = core::Font>,
     Renderer::Theme: StyleSheet + container::StyleSheet + scrollable::StyleSheet,
-    T: Clone + ToString + Eq + Hash,
+    T: Clone + Display + Eq + Hash,
     [T]: ToOwned<Owned = Vec<T>>,
 {
     /// Creates a new [`SelectionList`] with the given list of `options`,
     /// the current selected value, and the `message` to produce when an option is
     /// selected. This will default the `style`, `text_size` and `padding`. use `new_with`
     /// to set those.
-    pub fn new(
-        options: impl Into<Cow<'a, [T]>>,
-        on_selected: impl Fn((usize, T)) -> Message + 'static,
-    ) -> Self {
-        let options = options.into();
+    pub fn new(options: &'a [T], on_selected: impl Fn(usize, T) -> Message + 'static) -> Self {
         let container = Container::new(Scrollable::new(List {
-            options: options.clone(),
+            options,
             font: Font::default(),
             text_size: 12.0,
             padding: 5.0,
@@ -96,17 +92,16 @@ where
     /// the current selected value, the message to produce when an option is
     /// selected, the `style`, `text_size`, `padding` and `font`.
     pub fn new_with(
-        options: impl Into<Cow<'a, [T]>>,
-        on_selected: impl Fn((usize, T)) -> Message + 'static,
+        options: &'a [T],
+        on_selected: impl Fn(usize, T) -> Message + 'static,
         text_size: f32,
         padding: f32,
         style: <Renderer::Theme as StyleSheet>::Style,
         selected: Option<usize>,
         font: Font,
     ) -> Self {
-        let options = options.into();
         let container = Container::new(Scrollable::new(List {
-            options: options.clone(),
+            options,
             font,
             text_size,
             padding,

src/native/selection_list/list.rs

@@ -1,7 +1,7 @@
 //! Build and show dropdown `ListMenus`.
 use std::{
-    borrow::Cow,
     collections::hash_map::DefaultHasher,
+    fmt::Display,
     hash::{Hash, Hasher},
     marker::PhantomData,
 };
@@ -28,20 +28,20 @@ use iced_widget::{
 #[allow(missing_debug_implementations)]
 pub struct List<'a, T: 'a, Message, Renderer>
 where
-    T: Clone + ToString + Eq + Hash,
+    T: Clone + Display + Eq + Hash,
     [T]: ToOwned<Owned = Vec<T>>,
     Renderer: core::Renderer + core::text::Renderer<Font = core::Font>,
     Renderer::Theme: StyleSheet,
 {
     /// Options pointer to hold all rendered strings
-    pub options: Cow<'a, [T]>,
+    pub options: &'a [T],
     /// Hovered Item Pointer
     /// Label Font
     pub font: Renderer::Font,
     /// Style for Font colors and Box hover colors.
     pub style: <Renderer::Theme as StyleSheet>::Style,
     /// Function Pointer On Select to call on Mouse button press.
-    pub on_selected: Box<dyn Fn((usize, T)) -> Message>,
+    pub on_selected: Box<dyn Fn(usize, T) -> Message>,
     /// The padding Width
     pub padding: f32,
     /// The Text Size
@@ -63,7 +63,7 @@ pub struct ListState {
 
 impl<'a, T, Message, Renderer> Widget<Message, Renderer> for List<'a, T, Message, Renderer>
 where
-    T: Clone + ToString + Eq + Hash,
+    T: Clone + Display + Eq + Hash,
     Renderer: core::Renderer + core::text::Renderer<Font = core::Font>,
     Renderer::Theme: StyleSheet,
 {
@@ -164,7 +164,7 @@ where
                             .last_selected_index
                             .map_or(event::Status::Ignored, |last| {
                                 if let Some(option) = self.options.get(last.0) {
-                                    shell.publish((self.on_selected)((last.0, option.clone())));
+                                    shell.publish((self.on_selected)(last.0, option.clone()));
                                     event::Status::Captured
                                 } else {
                                     event::Status::Ignored
@@ -278,7 +278,7 @@ where
 impl<'a, T, Message, Renderer> From<List<'a, T, Message, Renderer>>
     for Element<'a, Message, Renderer>
 where
-    T: Clone + ToString + Eq + Hash,
+    T: Clone + Display + Eq + Hash,
     Message: 'a,
     Renderer: 'a + core::Renderer + core::text::Renderer<Font = core::Font>,
     Renderer::Theme: StyleSheet,