Reintroduce ui component: collapse

gui/src/ui/component/collapse.rs

@@ -0,0 +1,92 @@
+use iced::{
+    widget::{Button, Column},
+    Element,
+};
+use iced_lazy::{self, Component};
+use std::marker::PhantomData;
+
+use super::button::Style;
+
+pub fn collapse<
+    'a,
+    Message: 'a,
+    T: Into<Message> + Clone + 'a,
+    H: Fn() -> Element<'a, T> + 'a,
+    C: Fn() -> Element<'a, T> + 'a,
+>(
+    header: H,
+    content: C,
+) -> impl Into<Element<'a, Message>> {
+    Collapse {
+        header,
+        content,
+        phantom: PhantomData,
+    }
+}
+
+struct Collapse<'a, H, C> {
+    header: H,
+    content: C,
+    phantom: PhantomData<&'a H>,
+}
+
+#[derive(Debug, Clone, Copy)]
+enum Event<T> {
+    Internal(T),
+    Collapse(bool),
+}
+
+impl<'a, Message, T, H, C> Component<Message, iced::Renderer> for Collapse<'a, H, C>
+where
+    T: Into<Message> + Clone + 'a,
+    H: Fn() -> Element<'a, T>,
+    C: Fn() -> Element<'a, T>,
+{
+    type State = bool;
+    type Event = Event<T>;
+
+    fn update(&mut self, state: &mut Self::State, event: Event<T>) -> Option<Message> {
+        match event {
+            Event::Internal(e) => Some(e.into()),
+            Event::Collapse(s) => {
+                *state = s;
+                None
+            }
+        }
+    }
+
+    fn view(&self, state: &Self::State) -> Element<Self::Event> {
+        if *state {
+            Column::new()
+                .push(
+                    Button::new((self.header)().map(Event::Internal))
+                        .style(Style::TransparentBorder.into())
+                        .padding(10)
+                        .on_press(Event::Collapse(false)),
+                )
+                .push((self.content)().map(Event::Internal))
+                .into()
+        } else {
+            Column::new()
+                .push(
+                    Button::new((self.header)().map(Event::Internal))
+                        .style(Style::TransparentBorder.into())
+                        .padding(10)
+                        .on_press(Event::Collapse(true)),
+                )
+                .into()
+        }
+    }
+}
+
+impl<'a, Message, T, H: 'a, C: 'a> From<Collapse<'a, H, C>> for Element<'a, Message>
+where
+    Message: 'a,
+    T: Into<Message> + Clone + 'a,
+    H: Fn() -> Element<'a, T, iced::Renderer>,
+    C: Fn() -> Element<'a, T, iced::Renderer>,
+{
+    fn from(c: Collapse<'a, H, C>) -> Self {
+        iced_lazy::component(c)
+    }
+}

gui/src/ui/component/mod.rs

@@ -1,6 +1,7 @@
 pub mod badge;
 pub mod button;
 pub mod card;
+pub mod collapse;
 pub mod container;
 pub mod form;
 pub mod notification;