Refactor clickoutside util to use a single event listener rather than many, and add support for ignoring certain classes

packages/bbui/src/Actions/click_outside.js

@@ -1,18 +1,54 @@
-export default function clickOutside(element, callbackFunction) {
-  function onClick(event) {
-    if (!element.contains(event.target)) {
-      callbackFunction?.(event)
+const ignoredClasses = [".flatpickr-calendar"]
+let clickHandlers = []
+
+/**
+ * Handle a body click event
+ */
+const handleClick = event => {
+  // Ignore click if needed
+  for (let className of ignoredClasses) {
+    if (event.target.closest(className)) {
+      console.log("ignore")
+      return
     }
   }
 
-  document.body.addEventListener("click", onClick, true)
+  // Process handlers
+  clickHandlers.forEach(handler => {
+    if (!handler.element.contains(event.target)) {
+      handler.callback?.(event)
+    }
+  })
+}
+document.documentElement.addEventListener("click", handleClick, true)
 
-  return {
-    update(newCallbackFunction) {
-      callbackFunction = newCallbackFunction
-    },
-    destroy() {
-      document.body.removeEventListener("click", onClick, true)
-    },
+/**
+ * Adds or updates a click handler
+ */
+const updateHandler = (id, element, callback) => {
+  let existingHandler = clickHandlers.find(x => x.id === id)
+  if (!existingHandler) {
+    clickHandlers.push({ id, element, callback })
+  } else {
+    existingHandler.callback = callback
+  }
+}
+
+/**
+ * Removes a click handler
+ */
+const removeHandler = id => {
+  clickHandlers = clickHandlers.filter(x => x.id !== id)
+}
+
+/**
+ * Svelte action to apply a click outside handler for a certain element
+ */
+export default (element, callback) => {
+  const id = Math.random()
+  updateHandler(id, element, callback)
+  return {
+    update: newCallback => updateHandler(id, element, newCallback),
+    destroy: () => removeHandler(id),
   }
 }