Add Tinted button style placeholder and document ButtonLike (#3476)

- Adds a placeholder `ButtonStyle::Tinted`.
  - Note: Using this now will just give you a block of `gpui::red()`
- Documents ButtonLike and ButtonStyle to hopefully help make choosing a
button style easier.

Release Notes:

- N/A

crates/ui2/src/components/button/button_like.rs

@@ -5,18 +5,44 @@ use crate::h_stack;
 use crate::prelude::*;
 
 pub trait ButtonCommon: Clickable + Disableable {
+    /// A unique element id to help identify the button.
     fn id(&self) -> &ElementId;
+    /// The visual style of the button.
+    ///
+    /// Mosty commonly will be `ButtonStyle::Subtle`, or `ButtonStyle::Filled`
+    /// for an emphasized button.
     fn style(self, style: ButtonStyle) -> Self;
+    /// The size of the button.
+    ///
+    /// Most buttons will use the default size.
+    ///
+    /// ButtonSize can also be used to help build  non-button elements
+    /// that are consistently sized with buttons.
     fn size(self, size: ButtonSize) -> Self;
+    /// The tooltip that shows when a user hovers over the button.
+    ///
+    /// Nearly all interactable elements should have a tooltip. Some example
+    /// exceptions might a scroll bar, or a slider.
     fn tooltip(self, tooltip: impl Fn(&mut WindowContext) -> AnyView + 'static) -> Self;
 }
 
 #[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Copy, Default)]
 pub enum ButtonStyle {
-    #[default]
+    /// A filled button with a solid background color. Provides emphasis versus
+    /// the more common subtle button.
     Filled,
-    // Tinted,
+    /// 🚧 Under construction 🚧
+    ///
+    /// Used to emphasize a button in some way, like a selected state, or a semantic
+    /// coloring like an error or success button.
+    Tinted,
+    /// The default button style, used for most buttons. Has a transparent background,
+    /// but has a background color to indicate states like hover and active.
+    #[default]
     Subtle,
+    /// Used for buttons that only change forground color on hover and active states.
+    ///
+    /// TODO: Better docs for this.
     Transparent,
 }
 
@@ -40,6 +66,12 @@ impl ButtonStyle {
                 label_color: Color::Default.color(cx),
                 icon_color: Color::Default.color(cx),
             },
+            ButtonStyle::Tinted => ButtonLikeStyles {
+                background: gpui::red(),
+                border_color: gpui::red(),
+                label_color: gpui::red(),
+                icon_color: gpui::red(),
+            },
             ButtonStyle::Subtle => ButtonLikeStyles {
                 background: cx.theme().colors().ghost_element_background,
                 border_color: transparent_black(),
@@ -63,6 +95,12 @@ impl ButtonStyle {
                 label_color: Color::Default.color(cx),
                 icon_color: Color::Default.color(cx),
             },
+            ButtonStyle::Tinted => ButtonLikeStyles {
+                background: gpui::red(),
+                border_color: gpui::red(),
+                label_color: gpui::red(),
+                icon_color: gpui::red(),
+            },
             ButtonStyle::Subtle => ButtonLikeStyles {
                 background: cx.theme().colors().ghost_element_hover,
                 border_color: transparent_black(),
@@ -88,6 +126,12 @@ impl ButtonStyle {
                 label_color: Color::Default.color(cx),
                 icon_color: Color::Default.color(cx),
             },
+            ButtonStyle::Tinted => ButtonLikeStyles {
+                background: gpui::red(),
+                border_color: gpui::red(),
+                label_color: gpui::red(),
+                icon_color: gpui::red(),
+            },
             ButtonStyle::Subtle => ButtonLikeStyles {
                 background: cx.theme().colors().ghost_element_active,
                 border_color: transparent_black(),
@@ -114,6 +158,12 @@ impl ButtonStyle {
                 label_color: Color::Default.color(cx),
                 icon_color: Color::Default.color(cx),
             },
+            ButtonStyle::Tinted => ButtonLikeStyles {
+                background: gpui::red(),
+                border_color: gpui::red(),
+                label_color: gpui::red(),
+                icon_color: gpui::red(),
+            },
             ButtonStyle::Subtle => ButtonLikeStyles {
                 background: cx.theme().colors().ghost_element_background,
                 border_color: cx.theme().colors().border_focused,
@@ -137,6 +187,12 @@ impl ButtonStyle {
                 label_color: Color::Disabled.color(cx),
                 icon_color: Color::Disabled.color(cx),
             },
+            ButtonStyle::Tinted => ButtonLikeStyles {
+                background: gpui::red(),
+                border_color: gpui::red(),
+                label_color: gpui::red(),
+                icon_color: gpui::red(),
+            },
             ButtonStyle::Subtle => ButtonLikeStyles {
                 background: cx.theme().colors().ghost_element_disabled,
                 border_color: cx.theme().colors().border_disabled,
@@ -153,6 +209,8 @@ impl ButtonStyle {
     }
 }
 
+/// ButtonSize can also be used to help build  non-button elements
+/// that are consistently sized with buttons.
 #[derive(Default, PartialEq, Clone, Copy)]
 pub enum ButtonSize {
     #[default]
@@ -171,6 +229,11 @@ impl ButtonSize {
     }
 }
 
+/// A button-like element that can be used to create a custom button when
+/// prebuilt buttons are not sufficient. Use this sparingly, as it is
+/// unconstrained and may make the UI feel less consistent.
+///
+/// This is also used to build the prebuilt buttons.
 #[derive(IntoElement)]
 pub struct ButtonLike {
     id: ElementId,