Simplify nav button and add pick list

src/widget/nav.rs

@@ -0,0 +1,56 @@
+use iced::{
+    Background,
+    Color,
+    Theme,
+    widget
+};
+
+#[macro_export]
+macro_rules! nav_bar {
+    ($($x:expr),+ $(,)?) => (
+        $crate::iced::widget::Container::new(
+            $crate::iced::widget::Column::with_children(vec![
+                $($crate::iced::Element::from($x)),+,
+                $crate::iced::widget::vertical_space(
+                    $crate::iced::Length::Fill
+                ).into()
+            ])
+            .spacing(12)
+        )
+        .max_width(300)
+        .padding(12)
+        .style(theme::Container::Custom(
+            $crate::widget::nav_bar_style
+        ))
+    );
+}
+pub use nav_bar;
+
+pub fn nav_bar_style(theme: &Theme) -> widget::container::Appearance {
+    widget::container::Appearance {
+        text_color: None,
+        background: Some(Background::Color(
+            match theme {
+                Theme::Dark => Color::from_rgb8(0x29, 0x29, 0x29),
+                Theme::Light => Color::from_rgb8(0xfd, 0xfd, 0xfd),
+            }
+        )),
+        border_radius: 8.0,
+        border_width: 0.0,
+        border_color: Color::TRANSPARENT,
+    }
+}
+
+#[macro_export]
+macro_rules! nav_button {
+    ($icon: expr, $title:expr) => (
+        $crate::widget::button!(
+            $crate::widget::icon($icon, 16),
+            $crate::iced::widget::Text::new($title),
+            $crate::iced::widget::horizontal_space(
+                $crate::iced::Length::Fill
+            ),
+        )
+    );
+}
+pub use nav_button;