From 696f234134da6b599dbf02dc4e96a0fe235762c1 Mon Sep 17 00:00:00 2001
From: Radu <radu@pml4t.net>
Date: Thu, 7 Sep 2023 16:33:45 -0400
Subject: Fix: Attach event handler to all text areas in Adobe Connect

---
 page.js | 41 ++++++++++++++++++++++++++++++++++++-----
 1 file changed, 36 insertions(+), 5 deletions(-)

(limited to 'page.js')

diff --git a/page.js b/page.js
index 7546de7..a13cb30 100644
--- a/page.js
+++ b/page.js
@@ -4,7 +4,7 @@
 
 (async () => {
   if (await subEnabled()) {
-    console.log("TeX Type started.");
+    console.log("TeX Type: Started.");
 
     function cmdToUnicode(name, args) {
       if (name === "^")
@@ -267,15 +267,18 @@
       return input.value.length;
     }
 
-    window.addEventListener("input", (event) => {
+    function eventHandler(event) {
       if (event.target.selectionStart != null) {
+        const { selectionStart, selectionEnd } = event.target;
         const input = {
           value: event.target.value,
-          caret: event.target.selectionStart,
+          caret: selectionStart,
         };
         subCmds(input);
         event.target.value = input.value;
-        event.target.selectionStart = event.target.selectionEnd = input.caret;
+        event.target.selectionStart = input.caret;
+        // Sloppily ignore spurious `keyup`
+        event.target.selectionEnd = selectionEnd - selectionStart + input.caret;
       } else if (event.target.contentEditable === "true") {
         const textNode = window.getSelection().anchorNode;
         const input = {
@@ -288,6 +291,34 @@
           .getSelection()
           .setBaseAndExtent(textNode, input.caret, textNode, input.caret);
       }
-    });
+    }
+
+    const adobeConnectIframe = document.getElementById("html-meeting-frame");
+    if (adobeConnectIframe) {
+      // Adobe Connect workaround
+
+      console.debug("Tex Type: Listening for `textarea` elements.");
+
+      const textAreas =
+        adobeConnectIframe.contentDocument.getElementsByTagName("textarea");
+      const oldTextAreas = new Set(textAreas);
+
+      function handleNewTextAreas() {
+        console.debug("Tex Type: Seeking new `textarea`s.");
+        for (const textArea of textAreas)
+          if (!oldTextAreas.has(textArea)) {
+            console.debug("Tex Type: Found new `textarea`.");
+            textArea.addEventListener("keyup", eventHandler, true);
+            oldTextAreas.add(textArea);
+          }
+      }
+
+      const cb = new MutationObserver(handleNewTextAreas);
+      cb.observe(adobeConnectIframe.contentDocument, {
+        childList: true,
+        subtree: true,
+      });
+      handleNewTextAreas();
+    } else window.addEventListener("input", eventHandler, true);
   }
 })();
-- 
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