tooltip: Support render element (#605)

<img width="376" alt="image"
src="https://github.com/user-attachments/assets/52793001-03cb-46ca-80a3-42aa3db57ecb"
/>

crates/story/src/tooltip_story.rs

@@ -10,7 +10,7 @@ use ui::{
     h_flex,
     label::Label,
     tooltip::Tooltip,
-    v_flex,
+    v_flex, ActiveTheme, IconName,
 };
 
 pub struct TooltipStory {
@@ -72,15 +72,39 @@ impl Render for TooltipStory {
                     .justify_center()
                     .cursor(CursorStyle::PointingHand)
                     .child(Label::new("Hover me"))
-                    .id("tooltip-3")
+                    .id("tooltip-2")
                     .tooltip(|window, cx| Tooltip::new("This is a Label", window, cx)),
             )
             .child(
                 div()
                     .cursor(CursorStyle::PointingHand)
                     .child(Checkbox::new("check").label("Remember me").checked(true))
-                    .id("tooltip-4")
+                    .id("tooltip-3")
                     .tooltip(|window, cx| Tooltip::new("Checked!", window, cx)),
             )
+            .child(
+                div()
+                    .cursor(CursorStyle::PointingHand)
+                    .child(
+                        Button::new("button")
+                            .label("Hover me")
+                            .with_variant(ButtonVariant::Primary),
+                    )
+                    .id("tooltip-4")
+                    .tooltip(|window, cx| {
+                        Tooltip::new_element(window, cx, |_, cx| {
+                            h_flex()
+                                .gap_x_1()
+                                .child(IconName::Info)
+                                .child(
+                                    div()
+                                        .child("Muted Foreground")
+                                        .text_color(cx.theme().muted_foreground),
+                                )
+                                .child(div().child("Danger").text_color(cx.theme().danger))
+                                .child(IconName::ArrowUp)
+                        })
+                    }),
+            )
     }
 }

crates/ui/src/tooltip.rs

@@ -1,22 +1,41 @@
 use gpui::{
-    div, px, AnyView, App, AppContext, Context, IntoElement, ParentElement, Render, SharedString,
+    div, prelude::FluentBuilder, px, AnyElement, AnyView, App, AppContext, Context, IntoElement,
-    Styled, Window,
+    ParentElement, Render, SharedString, Styled, Window,
 };
 
 use crate::ActiveTheme;
 
 pub struct Tooltip {
     text: SharedString,
+    element_builder: Option<Box<dyn Fn(&mut Window, &mut App) -> AnyElement>>,
 }
 
 impl Tooltip {
     pub fn new(text: impl Into<SharedString>, _: &mut Window, cx: &mut App) -> AnyView {
-        cx.new(|_| Self { text: text.into() }).into()
+        cx.new(|_| Self {
+            text: text.into(),
+            element_builder: None,
+        })
+        .into()
+    }
+
+    pub fn new_element<E, F>(_: &mut Window, cx: &mut App, builder: F) -> AnyView
+    where
+        E: IntoElement,
+        F: Fn(&mut Window, &mut App) -> E + 'static,
+    {
+        cx.new(|_| Self {
+            text: "".into(),
+            element_builder: Some(Box::new(move |window, cx| {
+                builder(window, cx).into_any_element()
+            })),
+        })
+        .into()
     }
 }
 
 impl Render for Tooltip {
-    fn render(&mut self, _: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
+    fn render(&mut self, window: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
         div().child(
             // Wrap in a child, to ensure the left margin is applied to the tooltip
             div()
@@ -32,7 +51,13 @@ impl Render for Tooltip {
                 .py_0p5()
                 .px_2()
                 .text_sm()
-                .child(self.text.clone()),
+                .map(|this| {
+                    if let Some(builder) = &self.element_builder {
+                        this.child(builder(window, cx))
+                    } else {
+                        this.child(self.text.clone())
+                    }
+                }),
         )
     }
 }