wip: Various refactorings and improvements

src/widget/list/column.rs

@@ -0,0 +1,65 @@
+// Copyright 2022 System76 <info@system76.com>
+// SPDX-License-Identifier: MPL-2.0
+
+use apply::Apply;
+use crate::{Element, theme};
+use crate::widget::horizontal_rule;
+use iced::{Background, Color};
+
+#[must_use]
+pub fn list_column<'a, Message: 'static>() -> ListColumn<'a, Message> {
+    ListColumn::default()
+}
+
+pub struct ListColumn<'a, Message> {
+    children: Vec<Element<'a, Message>>,
+}
+
+impl<'a, Message: 'static> Default for ListColumn<'a, Message> {
+    fn default() -> Self {
+        Self { children: Vec::with_capacity(4) }
+    }
+}
+
+impl<'a, Message: 'static> ListColumn<'a, Message> {
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    #[must_use]
+    pub fn add(mut self, item: impl Into<Element<'a, Message>>) -> Self {
+        if !self.children.is_empty() {
+            self.children.push(horizontal_rule(12).into());
+        }
+
+        self.children.push(item.into());
+        self
+    }
+
+    #[must_use]
+    pub fn into_element(self) -> Element<'a, Message> {
+        iced::widget::column(self.children)
+            .spacing(12)
+            .apply(iced::widget::container)
+            .padding([12, 16])
+            .style(theme::Container::Custom(style))
+            .into()
+    }
+}
+
+impl<'a, Message: 'static> From<ListColumn<'a, Message>> for Element<'a, Message> {
+    fn from(column: ListColumn<'a, Message>) -> Self {
+        column.into_element()
+    }
+}
+
+fn style(theme: &crate::Theme) -> iced::widget::container::Appearance {
+    let cosmic = &theme.cosmic().primary;
+    iced::widget::container::Appearance {
+        text_color: Some(cosmic.on.into()),
+        background: Some(Background::Color(cosmic.base.into())),
+        border_radius: 8.0,
+        border_width: 0.0,
+        border_color: Color::TRANSPARENT,
+    }
+}