From 3f6faa20a50122976eb4df41ccd43520221c0e52 Mon Sep 17 00:00:00 2001
From: temportalflux <dustin.yost.t@gmail.com>
Date: Sat, 20 Jun 2026 15:28:43 -0400
Subject: [PATCH] stub out <textarea> element

---
 .../src/editable_text/input_element.rs        |  40 ++---
 .../src/editable_text/storage.rs              |  15 +-
 .../src/editable_text/text_area_element.rs    | 161 +++++++++++++++++-
 .../src/editable_text/text_area_state.rs      |   8 +
 4 files changed, 196 insertions(+), 28 deletions(-)

diff --git a/crates/gpui_elements/src/editable_text/input_element.rs b/crates/gpui_elements/src/editable_text/input_element.rs
index 52257aabec..61f3ec8a9e 100644
--- a/crates/gpui_elements/src/editable_text/input_element.rs
+++ b/crates/gpui_elements/src/editable_text/input_element.rs
@@ -1,11 +1,10 @@
 use crate::editable_text::{
-    EditableInputActionElement, StateBackedElement, TextInputState, UnicodeTextStorage,
+    EditableInputActionElement, InitStorage, StateBackedElement, TextInputState,
 };
 use gpui::{
     App, Element, ElementId, Entity, Hitbox, InteractiveElement, Interactivity, IntoElement,
     SharedString, StyleRefinement, Styled, TextStyle, Window,
 };
-use std::rc::Rc;
 
 #[track_caller]
 pub fn input(id: impl Into<ElementId>) -> TextInputElement {
@@ -47,17 +46,6 @@ impl IntoElement for TextInputElement {
     }
 }
 
-#[derive(Clone, Default)]
-pub(super) struct InitStorage(Option<Rc<dyn Fn(&mut App) -> Box<dyn UnicodeTextStorage>>>);
-impl InitStorage {
-    fn exec(&self, cx: &mut App) -> Box<dyn UnicodeTextStorage> {
-        match &self.0 {
-            None => Box::new(String::new()),
-            Some(init) => (*init)(cx),
-        }
-    }
-}
-
 impl EditableInputActionElement for TextInputElement {}
 impl super::StateBackedElement for TextInputElement {
     type State = TextInputState;
@@ -80,20 +68,24 @@ impl super::StateBackedElement for TextInputElement {
     }
 }
 
-#[doc(hidden)]
-pub struct LayoutState {
-    state: Entity<TextInputState>,
-    text_style: TextStyle,
-}
+pub mod element {
+    use super::*;
 
-#[doc(hidden)]
-pub struct PrepaintState {
-    hitbox: Option<Hitbox>,
+    #[doc(hidden)]
+    pub struct LayoutState {
+        pub state: Entity<TextInputState>,
+        pub text_style: TextStyle,
+    }
+
+    #[doc(hidden)]
+    pub struct PrepaintState {
+        pub hitbox: Option<Hitbox>,
+    }
 }
 
 impl Element for TextInputElement {
-    type RequestLayoutState = LayoutState;
-    type PrepaintState = PrepaintState;
+    type RequestLayoutState = element::LayoutState;
+    type PrepaintState = element::PrepaintState;
 
     fn id(&self) -> Option<ElementId> {
         self.interactivity.element_id.clone()
@@ -130,7 +122,7 @@ impl Element for TextInputElement {
             },
         );
 
-        let layout_state = LayoutState {
+        let layout_state = element::LayoutState {
             state,
             text_style: resolved_text_style.unwrap_or_else(|| window.text_style()),
         };
diff --git a/crates/gpui_elements/src/editable_text/storage.rs b/crates/gpui_elements/src/editable_text/storage.rs
index 1cd990cff8..e5b2422e65 100644
--- a/crates/gpui_elements/src/editable_text/storage.rs
+++ b/crates/gpui_elements/src/editable_text/storage.rs
@@ -1,5 +1,5 @@
-use gpui::NavigationDirection;
-use std::ops::Range;
+use gpui::{App, NavigationDirection};
+use std::{ops::Range, rc::Rc};
 use unicode_segmentation::UnicodeSegmentation;
 
 pub enum TextBoundary {
@@ -13,6 +13,17 @@ pub enum TextBoundary {
     Document,
 }
 
+#[derive(Clone, Default)]
+pub(super) struct InitStorage(Option<Rc<dyn Fn(&mut App) -> Box<dyn UnicodeTextStorage>>>);
+impl InitStorage {
+    pub fn exec(&self, cx: &mut App) -> Box<dyn UnicodeTextStorage> {
+        match &self.0 {
+            None => Box::new(String::new()),
+            Some(init) => (*init)(cx),
+        }
+    }
+}
+
 pub trait UnicodeTextStorage {
     /// Returns a reference to the utf8 string.
     fn content_utf8(&self) -> &str;
diff --git a/crates/gpui_elements/src/editable_text/text_area_element.rs b/crates/gpui_elements/src/editable_text/text_area_element.rs
index cad2948606..02662e0bd9 100644
--- a/crates/gpui_elements/src/editable_text/text_area_element.rs
+++ b/crates/gpui_elements/src/editable_text/text_area_element.rs
@@ -1,3 +1,160 @@
-use gpui::ElementId;
+use crate::editable_text::{
+    EditableInputActionElement, InitStorage, StateBackedElement, TextAreaState,
+};
+use gpui::{
+    App, Element, ElementId, Entity, Hitbox, InteractiveElement, Interactivity, IntoElement,
+    SharedString, StyleRefinement, Styled, TextStyle, Window,
+};
 
-pub fn text_area(id: impl Into<ElementId>) {}
+pub fn text_area(id: impl Into<ElementId>) -> TextAreaElement {
+    let mut this = TextAreaElement {
+        id: id.into(),
+        placeholder: None,
+        interactivity: Interactivity::new(),
+        init_storage: InitStorage::default(),
+    };
+    this = this.key_context(super::DEFAULT_INPUT_CONTEXT);
+    this.register_actions();
+    this
+}
+
+// TODO: Disabled flag/state?
+pub struct TextAreaElement {
+    id: ElementId,
+    placeholder: Option<SharedString>,
+    interactivity: Interactivity,
+    init_storage: InitStorage,
+}
+
+impl InteractiveElement for TextAreaElement {
+    fn interactivity(&mut self) -> &mut Interactivity {
+        &mut self.interactivity
+    }
+}
+
+impl Styled for TextAreaElement {
+    fn style(&mut self) -> &mut StyleRefinement {
+        &mut self.interactivity.base_style
+    }
+}
+
+impl IntoElement for TextAreaElement {
+    type Element = Self;
+    fn into_element(self) -> Self::Element {
+        self
+    }
+}
+
+impl EditableInputActionElement for TextAreaElement {}
+impl super::StateBackedElement for TextAreaElement {
+    type State = TextAreaState;
+    type InitProps = (ElementId, InitStorage);
+
+    fn init_props(&self) -> Self::InitProps {
+        (self.id.clone(), self.init_storage.clone())
+    }
+
+    fn get_or_init_state(
+        init_props: &Self::InitProps,
+        window: &mut Window,
+        cx: &mut App,
+    ) -> Entity<Self::State> {
+        // Get the state from the app using the element's id as the key.
+        // If it doesnt exist, initialize a new state with the user's desired storage medium.
+        window.use_keyed_state(init_props.0.clone(), cx, |_window, cx| {
+            TextAreaState::new(init_props.1.exec(cx), cx)
+        })
+    }
+}
+
+pub mod element {
+    use super::*;
+
+    #[doc(hidden)]
+    pub struct LayoutState {
+        pub state: Entity<TextAreaState>,
+        pub text_style: TextStyle,
+    }
+
+    #[doc(hidden)]
+    pub struct PrepaintState {
+        pub hitbox: Option<Hitbox>,
+    }
+}
+
+impl Element for TextAreaElement {
+    type RequestLayoutState = element::LayoutState;
+    type PrepaintState = element::PrepaintState;
+
+    fn id(&self) -> Option<ElementId> {
+        self.interactivity.element_id.clone()
+    }
+
+    fn source_location(&self) -> Option<&'static std::panic::Location<'static>> {
+        self.interactivity.source_location()
+    }
+
+    fn request_layout(
+        &mut self,
+        global_id: Option<&gpui::GlobalElementId>,
+        inspector_id: Option<&gpui::InspectorElementId>,
+        window: &mut gpui::Window,
+        cx: &mut gpui::App,
+    ) -> (gpui::LayoutId, Self::RequestLayoutState) {
+        let mut resolved_text_style = None;
+
+        let state = self.get_state(window, cx);
+
+        let layout_id = self.interactivity.request_layout(
+            global_id,
+            inspector_id,
+            window,
+            cx,
+            |element_style, window, cx| {
+                window.with_text_style(element_style.text_style().cloned(), |window| {
+                    resolved_text_style = Some(window.text_style());
+
+                    let mut style = element_style.clone();
+                    if let gpui::Length::Auto = style.size.width {
+                        style.size.width = gpui::relative(1.).into();
+                    }
+                    if let gpui::Length::Auto = style.size.height {
+                        style.size.height = gpui::relative(1.).into();
+                    }
+                    window.request_layout(style, None, cx)
+                })
+            },
+        );
+
+        let layout_state = element::LayoutState {
+            state,
+            text_style: resolved_text_style.unwrap_or_else(|| window.text_style()),
+        };
+        (layout_id, layout_state)
+    }
+
+    fn prepaint(
+        &mut self,
+        id: Option<&gpui::GlobalElementId>,
+        inspector_id: Option<&gpui::InspectorElementId>,
+        bounds: gpui::Bounds<gpui::Pixels>,
+        request_layout: &mut Self::RequestLayoutState,
+        window: &mut gpui::Window,
+        cx: &mut gpui::App,
+    ) -> Self::PrepaintState {
+        todo!()
+    }
+
+    fn paint(
+        &mut self,
+        id: Option<&gpui::GlobalElementId>,
+        inspector_id: Option<&gpui::InspectorElementId>,
+        bounds: gpui::Bounds<gpui::Pixels>,
+        request_layout: &mut Self::RequestLayoutState,
+        prepaint: &mut Self::PrepaintState,
+        window: &mut gpui::Window,
+        cx: &mut gpui::App,
+    ) {
+        todo!()
+    }
+}
diff --git a/crates/gpui_elements/src/editable_text/text_area_state.rs b/crates/gpui_elements/src/editable_text/text_area_state.rs
index 628e135e73..a69225e3ac 100644
--- a/crates/gpui_elements/src/editable_text/text_area_state.rs
+++ b/crates/gpui_elements/src/editable_text/text_area_state.rs
@@ -1,5 +1,6 @@
 use crate::editable_text::{
     EditableTextActionHandler, TextBoundary, TextInputStateBase, TextStateNotifier,
+    UnicodeTextStorage,
     notify::{TextChanged, TextHistoryPushed},
 };
 use gpui::{
@@ -15,6 +16,13 @@ pub struct TextAreaState {
 impl EventEmitter<TextChanged> for TextAreaState {}
 impl EventEmitter<TextHistoryPushed> for TextAreaState {}
 
+impl TextAreaState {
+    pub fn new(storage: impl Into<Box<dyn UnicodeTextStorage>>, cx: &mut Context<Self>) -> Self {
+        let internal = TextInputStateBase::new(storage, cx);
+        Self { internal }
+    }
+}
+
 impl TextStateNotifier for Context<'_, TextAreaState> {
     fn notify_changed(&mut self) {
         self.notify();