Factor out LabelLike to share common label styles (#3510)

This PR factors out a new `LabelLike` component to share common styles
between the `Label` and `HighlightedLabel` components.

Release Notes:

- N/A

crates/ui2/src/components/label/label_like.rs

@@ -0,0 +1,102 @@
+use gpui::{relative, AnyElement, Div, Styled};
+use smallvec::SmallVec;
+
+use crate::prelude::*;
+
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Copy, Default)]
+pub enum LabelSize {
+    #[default]
+    Default,
+    Small,
+}
+
+#[derive(Default, PartialEq, Copy, Clone)]
+pub enum LineHeightStyle {
+    #[default]
+    TextLabel,
+    /// Sets the line height to 1
+    UILabel,
+}
+
+pub trait LabelCommon {
+    fn size(self, size: LabelSize) -> Self;
+    fn line_height_style(self, line_height_style: LineHeightStyle) -> Self;
+    fn color(self, color: Color) -> Self;
+    fn strikethrough(self, strikethrough: bool) -> Self;
+}
+
+#[derive(IntoElement)]
+pub struct LabelLike {
+    size: LabelSize,
+    line_height_style: LineHeightStyle,
+    pub(crate) color: Color,
+    strikethrough: bool,
+    children: SmallVec<[AnyElement; 2]>,
+}
+
+impl LabelLike {
+    pub fn new() -> Self {
+        Self {
+            size: LabelSize::Default,
+            line_height_style: LineHeightStyle::default(),
+            color: Color::Default,
+            strikethrough: false,
+            children: SmallVec::new(),
+        }
+    }
+}
+
+impl LabelCommon for LabelLike {
+    fn size(mut self, size: LabelSize) -> Self {
+        self.size = size;
+        self
+    }
+
+    fn line_height_style(mut self, line_height_style: LineHeightStyle) -> Self {
+        self.line_height_style = line_height_style;
+        self
+    }
+
+    fn color(mut self, color: Color) -> Self {
+        self.color = color;
+        self
+    }
+
+    fn strikethrough(mut self, strikethrough: bool) -> Self {
+        self.strikethrough = strikethrough;
+        self
+    }
+}
+
+impl ParentElement for LabelLike {
+    fn children_mut(&mut self) -> &mut SmallVec<[AnyElement; 2]> {
+        &mut self.children
+    }
+}
+
+impl RenderOnce for LabelLike {
+    type Rendered = Div;
+
+    fn render(self, cx: &mut WindowContext) -> Self::Rendered {
+        div()
+            .when(self.strikethrough, |this| {
+                this.relative().child(
+                    div()
+                        .absolute()
+                        .top_1_2()
+                        .w_full()
+                        .h_px()
+                        .bg(Color::Hidden.color(cx)),
+                )
+            })
+            .map(|this| match self.size {
+                LabelSize::Default => this.text_ui(),
+                LabelSize::Small => this.text_ui_sm(),
+            })
+            .when(self.line_height_style == LineHeightStyle::UILabel, |this| {
+                this.line_height(relative(1.))
+            })
+            .text_color(self.color.color(cx))
+            .children(self.children)
+    }
+}