Segmented button

- Implemented the segmented button widget

examples/cosmic/src/window.rs

@@ -9,7 +9,7 @@ use cosmic::{
     iced_lazy::responsive,
     iced_winit::window::{drag, toggle_maximize, minimize},
     theme::{self, Theme},
-    widget::{button, nav_button, nav_bar, header_bar, settings, scrollable, toggler, nav_bar_item},
+    widget::{button, nav_button, nav_bar, header_bar, settings, scrollable, toggler, nav_bar_item, segmented_button},
     Element,
     ElementExt,
 };
@@ -62,6 +62,7 @@ pub enum Message {
     TogglerToggled(bool),
     PickListSelected(&'static str),
     RowSelected(usize),
+    SegmentatedButtonPressed(usize),
     Close,
     ToggleSidebar,
     Drag,
@@ -110,6 +111,9 @@ impl Application for Window {
             Message::Minimize => return minimize(true),
             Message::Maximize => return toggle_maximize(),
             Message::RowSelected(row) => println!("Selected row {row}"),
+            Message::SegmentatedButtonPressed(index) => {
+                println!("Segmented button at index: {index}")
+            }
         }
 
         Command::none()
@@ -143,6 +147,7 @@ impl Application for Window {
         let content = responsive(|size| {
             let condensed = size.width < 900.0;
             let sidebar: Element<_> = nav_bar()
+                // TODO: Make this take an iterator
                 .source(BTreeMap::from([
                     (
                         nav_bar_item()
@@ -272,10 +277,50 @@ impl Application for Window {
                             .width(Length::Units(250))
                             .height(Length::Units(4))
                     ))
-                    .into()
-            ])
-            .into();
-
+                    .add(settings::item(
+                        "Segmented Button",
+                        segmented_button()
+                            .options(vec!["Vertical", "Horizontal"])
+                            .on_button_pressed(Box::new(Message::SegmentatedButtonPressed))
+                    ))
+                    .add(settings::item(
+                        "Checkbox",
+                        checkbox("Checkbox", self.checkbox_value, Message::CheckboxToggled)
+                    ))
+                    .into(),
+                settings::view_section("Expander")
+                    .add(settings::item(
+                        "Expander",
+                        expander()
+                            .title("Label")
+                            .subtitle("Caption")
+                            .icon(String::from("edit-paste"))
+                            .on_row_selected(Box::new(Message::RowSelected))
+                            .rows(vec![
+                                list_row()
+                                    .title("Label")
+                                    .subtitle("Caption")
+                                    .icon(String::from("help-about")),
+                                list_row().subtitle("Caption").title("Label"),
+                                list_row().title("Label")
+                            ])
+                    )).into(),
+                settings::view_section("List Box")
+                    .add(settings::item(
+                        "List Box",
+                        list_box()
+                            .style(theme::Container::Custom(list_section_style))
+                            .children(vec![
+                                cosmic::list_box_row!("Title").into(),
+                                cosmic::list_box_row!("Title", "Subtitle").into(),
+                                cosmic::list_box_row!("Title", "", "edit-paste").into(),
+                                cosmic::list_box_row!("", "Subtitle", "edit-paste").into(),
+                                cosmic::list_box_row!("Title", "Subtitle", "edit-paste").into()
+                            ])
+                            .render()
+                    )).into(),
+            ]);
+            
             let mut widgets = Vec::with_capacity(2);
 
             widgets.push(sidebar.debug(self.debug));

src/widget/mod.rs

@@ -28,4 +28,7 @@ mod scrollable;
 pub use scrollable::*;
 
 pub mod separator;
-pub use separator::{horizontal_rule, vertical_rule};
+pub use separator::*;
+
+pub mod segmented_button;
+pub use segmented_button::*;

src/widget/segmented_button.rs

@@ -0,0 +1,91 @@
+use derive_setters::Setters;
+use iced::{
+    alignment::{Horizontal, Vertical},
+    theme,
+    widget::{button, container, text, Row},
+    Background, Element, Length, Renderer, Theme,
+};
+use iced_lazy::Component;
+
+#[derive(Setters)]
+pub struct SegmentedButton<'a, Message> {
+    options: Vec<&'a str>,
+    #[setters(strip_option)]
+    on_button_pressed: Option<Box<dyn Fn(usize) -> Message>>,
+}
+
+pub fn segmented_button<'a, Message>() -> SegmentedButton<'a, Message> {
+    SegmentedButton {
+        options: vec![],
+        on_button_pressed: None,
+    }
+}
+
+#[derive(Clone)]
+pub enum SegmentedButtonEvent {
+    Pressed(usize),
+}
+
+impl<'a, Message> Component<Message, Renderer> for SegmentedButton<'a, Message> {
+    type State = usize;
+
+    type Event = SegmentedButtonEvent;
+
+    fn update(&mut self, state: &mut Self::State, event: Self::Event) -> Option<Message> {
+        match event {
+            SegmentedButtonEvent::Pressed(index) => {
+                *state = index;
+                self.on_button_pressed
+                    .as_ref()
+                    .map(|on_button_pressed| (on_button_pressed)(index))
+            }
+        }
+    }
+
+    fn view(&self, state: &Self::State) -> Element<Self::Event> {
+        let buttons: Vec<Element<'a, Self::Event>> = self
+            .options
+            .iter()
+            .enumerate()
+            .map(|(index, option)| {
+                button(
+                    container(text(*option))
+                        .width(Length::Fill)
+                        .height(Length::Fill)
+                        .align_x(Horizontal::Center)
+                        .align_y(Vertical::Center),
+                )
+                .width(Length::Units(136))
+                .height(Length::Units(32))
+                .style(if *state == index {
+                    theme::Button::Secondary.into()
+                } else {
+                    theme::Button::Primary.into()
+                })
+                .on_press(SegmentedButtonEvent::Pressed(index))
+                .into()
+            })
+            .collect();
+        container(Row::with_children(buttons).spacing(5).width(Length::Shrink))
+            .padding(2)
+            .style(theme::Container::Custom(view_switcher_container_style))
+            .into()
+    }
+}
+
+pub fn view_switcher_container_style(theme: &Theme) -> iced_style::container::Appearance {
+    let accent = &theme.cosmic().accent;
+    iced_style::container::Appearance {
+        text_color: Default::default(),
+        background: Some(Background::Color(accent.base.into())),
+        border_radius: 24.0,
+        border_width: 2.0,
+        border_color: accent.base.into(),
+    }
+}
+
+impl<'a, Message: 'a> From<SegmentedButton<'a, Message>> for Element<'a, Message> {
+    fn from(segmented_button: SegmentedButton<'a, Message>) -> Self {
+        iced_lazy::component(segmented_button)
+    }
+}