From 1d78c3f4595b9a30ba6f02b97c8150aaad7efc92 Mon Sep 17 00:00:00 2001
From: Nico Burns <nico@nicoburns.com>
Date: Sat, 28 Dec 2024 10:56:36 +1300
Subject: [PATCH] Add initial <textarea> support

---
 packages/blitz-dom/src/document.rs         |  2 +-
 packages/blitz-dom/src/events/keyboard.rs  | 13 ++++++++-----
 packages/blitz-dom/src/layout/construct.rs |  1 +
 packages/blitz-dom/src/layout/mod.rs       | 13 ++++++++++++-
 4 files changed, 22 insertions(+), 7 deletions(-)

diff --git a/packages/blitz-dom/src/document.rs b/packages/blitz-dom/src/document.rs
index 331ce81a..cd6c8a27 100644
--- a/packages/blitz-dom/src/document.rs
+++ b/packages/blitz-dom/src/document.rs
@@ -240,7 +240,7 @@ impl DocumentLike for Document {
                     if let Some(input_data) = text_input_data {
                         println!("Sent text event to {}", node_id);
                         apply_keypress_event(
-                            &mut input_data.editor,
+                            input_data,
                             &mut self.font_ctx,
                             &mut self.layout_ctx,
                             event,
diff --git a/packages/blitz-dom/src/events/keyboard.rs b/packages/blitz-dom/src/events/keyboard.rs
index 38f5ec43..3b2d34c9 100644
--- a/packages/blitz-dom/src/events/keyboard.rs
+++ b/packages/blitz-dom/src/events/keyboard.rs
@@ -1,12 +1,12 @@
-use crate::node::TextBrush;
-use parley::{FontContext, LayoutContext, PlainEditor};
+use crate::node::{TextBrush, TextInputData};
+use parley::{FontContext, LayoutContext};
 use winit::{
     event::{KeyEvent, Modifiers},
     keyboard::{Key, NamedKey},
 };
 
 pub(crate) fn apply_keypress_event(
-    editor: &mut PlainEditor<TextBrush>,
+    input_data: &mut TextInputData,
     font_ctx: &mut FontContext,
     layout_ctx: &mut LayoutContext<TextBrush>,
     event: KeyEvent,
@@ -26,6 +26,8 @@ pub(crate) fn apply_keypress_event(
         }
     };
 
+    let is_multiline = input_data.is_multiline;
+    let editor = &mut input_data.editor;
     let mut driver = editor.driver(font_ctx, layout_ctx);
     match event.logical_key {
         #[cfg(all(feature = "clipboard", not(target_os = "android")))]
@@ -142,8 +144,9 @@ pub(crate) fn apply_keypress_event(
             }
         }
         Key::Named(NamedKey::Enter) => {
-            // TODO: support multi-line text inputs
-            // driver.insert_or_replace_selection("\n")
+            if is_multiline {
+                driver.insert_or_replace_selection("\n");
+            }
         }
         Key::Named(NamedKey::Space) => driver.insert_or_replace_selection(" "),
         Key::Character(s) => driver.insert_or_replace_selection(&s),
diff --git a/packages/blitz-dom/src/layout/construct.rs b/packages/blitz-dom/src/layout/construct.rs
index 2f1b5338..3fd0e4e1 100644
--- a/packages/blitz-dom/src/layout/construct.rs
+++ b/packages/blitz-dom/src/layout/construct.rs
@@ -875,6 +875,7 @@ pub(crate) fn build_inline_layout(
                         if *tag_name == local_name!("img")
                             || *tag_name == local_name!("svg")
                             || *tag_name == local_name!("input")
+                            || *tag_name == local_name!("textarea")
                         {
                             builder.push_inline_box(InlineBox {
                                 id: node_id as u64,
diff --git a/packages/blitz-dom/src/layout/mod.rs b/packages/blitz-dom/src/layout/mod.rs
index db54fc1b..92c79acd 100644
--- a/packages/blitz-dom/src/layout/mod.rs
+++ b/packages/blitz-dom/src/layout/mod.rs
@@ -134,7 +134,18 @@ impl LayoutPartialTree for Document {
                         return taffy::LayoutOutput::HIDDEN;
                     }
 
-                    // todo: need to handle shadow roots by actually descending into them
+                    // TODO: deduplicate with single-line text input
+                    if *element_data.name.local == *"textarea" {
+                        return compute_leaf_layout(
+                            inputs,
+                            &node.style,
+                            |_known_size, _available_space| taffy::Size {
+                                width: 300.0,
+                                height: resolved_line_height.unwrap_or(16.0) * 4.0,
+                            },
+                        );
+                    }
+
                     if *element_data.name.local == *"input" {
                         match element_data.attr(local_name!("type")) {
                             // if the input type is hidden, hide it