From 9f0b5b00f7ada4c5735230d0f93e04a3c58d4d7a Mon Sep 17 00:00:00 2001
From: Kit La Touche <kit@transneptune.net>
Date: Sun, 11 May 2025 21:56:33 -0400
Subject: Fix up input to be a contenteditable div

---
 ui/lib/components/MessageInput.svelte | 18 ++++++++++++++----
 ui/styles/textarea.css                | 34 +++++++++++++++++++++++++---------
 2 files changed, 39 insertions(+), 13 deletions(-)

diff --git a/ui/lib/components/MessageInput.svelte b/ui/lib/components/MessageInput.svelte
index 69a8298..1f4ba99 100644
--- a/ui/lib/components/MessageInput.svelte
+++ b/ui/lib/components/MessageInput.svelte
@@ -1,7 +1,10 @@
 <script>
   let { sendMessage = async (message) => {} } = $props();
 
+  let form = $state(null);
   let value = $state('');
+  // This doesn't seem to work with a contenteditable two-way bound svelte
+  // thing:
   let disabled = $state(false);
 
   async function onsubmit(event) {
@@ -9,7 +12,7 @@
     disabled = true;
     try {
       await sendMessage(value);
-      event.target.reset();
+      value = '';
     } finally {
       disabled = false;
     }
@@ -19,12 +22,19 @@
     let modifier = event.shiftKey || event.altKey || event.ctrlKey || event.metaKey;
     if (!modifier && event.key === 'Enter') {
       event.preventDefault();
-      event.target.form.requestSubmit();
+      form?.requestSubmit?.();
     }
   }
 </script>
 
-<form {onsubmit}>
-  <textarea {onkeydown} bind:value {disabled} placeholder="Say something..."></textarea>
+<form {onsubmit} bind:this={form}>
+  <div
+    contenteditable="plaintext-only"
+    class="textarea"
+    bind:textContent={value}
+    {onkeydown}
+    {disabled}
+    placeholder="Say something..."
+  ></div>
   <button type="submit">&raquo;</button>
 </form>
diff --git a/ui/styles/textarea.css b/ui/styles/textarea.css
index 4b8602c..4dc804a 100644
--- a/ui/styles/textarea.css
+++ b/ui/styles/textarea.css
@@ -4,28 +4,44 @@
   flex-direction: row;
   justify-content: flex-start;
   align-items: stretch;
+}
 
-  @media (width <= 640px) {
-    margin: 0 0.5rem 1rem 0.5rem;
-  }
+/* The second selector is more generally useful, but it doesn't seem to work,
+ * so I added in the first selector. */
+.textarea:empty:before,
+[contenteditable='true']:empty:before {
+  content: attr(placeholder);
+  pointer-events: none;
+  display: block; /* For Firefox */
 }
 
-.create-message textarea {
-  padding: 0.5rem;
-  border-radius: 0.5rem 0 0 0.5rem;
+.create-message .textarea {
+  padding: 1rem;
   border: 1px solid var(--colour-input-border);
   z-index: 1; /* Just to make the focus-active border go over the following button. */
   flex-grow: 1;
   background-color: var(--colour-input-bg);
   color: var(--colour-input-text);
-  font-family: 'FiraCode', monospace;
+  min-height: 1rem;
+  max-height: 10rem;
+  overflow-x: hidden;
+  overflow-y: auto;
+
+  @media (width <= 640px) {
+    border-radius: 0;
+    min-height: 2.5rem;
+  }
 }
 
 .create-message button {
-  border-radius: 0 0.5rem 0.5rem 0;
   border: 1px solid var(--colour-input-border);
   background-color: var(--colour-input-bg);
   color: var(--colour-input-text);
+  padding: 1rem;
+
+  @media (width <= 640px) {
+    border-radius: 0;
+  }
 }
 
 main {
@@ -38,7 +54,7 @@ main {
 /* Workaround for iOS zooming in on the textarea when it gets focus. */
 @media screen and (-webkit-min-device-pixel-ratio: 0) {
   select,
-  textarea,
+  .textarea,
   input {
     font-size: 16px;
   }
-- 
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