Simplify toggle, do some reorganization

crates/ui2/src/components/toggle.rs

@@ -0,0 +1,61 @@
+use gpui2::{div, Component, ParentElement};
+
+use crate::{Icon, IconColor, IconElement, IconSize};
+
+/// Whether the entry is toggleable, and if so, whether it is currently toggled.
+///
+/// To make an element toggleable, simply add a `Toggle::Toggled(_)` and handle it's cases.
+///
+/// You can check if an element is toggleable with `.is_toggleable()`
+///
+/// Possible values:
+/// - `Toggle::NotToggleable` - The entry is not toggleable
+/// - `Toggle::Toggled(true)` - The entry is toggleable and toggled
+/// - `Toggle::Toggled(false)` - The entry is toggleable and not toggled
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+pub enum Toggle {
+    NotToggleable,
+    Toggled(bool),
+}
+
+impl Toggle {
+    /// Returns true if the entry is toggled (or is not toggleable.)
+    ///
+    /// As element that isn't toggleable is always "expanded" or "enabled"
+    /// returning true in that case makes sense.
+    pub fn is_toggled(&self) -> bool {
+        match self {
+            Self::Toggled(false) => false,
+            _ => true,
+        }
+    }
+
+    pub fn is_toggleable(&self) -> bool {
+        match self {
+            Self::Toggled(_) => true,
+            _ => false,
+        }
+    }
+}
+
+impl From<bool> for Toggle {
+    fn from(toggled: bool) -> Self {
+        Toggle::Toggled(toggled)
+    }
+}
+
+pub fn disclosure_control<V: 'static>(toggle: Toggle) -> impl Component<V> {
+    match (toggle.is_toggleable(), toggle.is_toggled()) {
+        (false, _) => div(),
+        (_, true) => div().child(
+            IconElement::new(Icon::ChevronDown)
+                .color(IconColor::Muted)
+                .size(IconSize::Small),
+        ),
+        (_, false) => div().child(
+            IconElement::new(Icon::ChevronRight)
+                .color(IconColor::Muted)
+                .size(IconSize::Small),
+        ),
+    }
+}