Add scroll behaviour

Server/MarkdownPreviewer/server.py

@@ -316,6 +316,11 @@ class PushPull(WebSocketHandler):
         for socket in websockets:
             socket.write_message({"course" : content})
 
+    @classmethod
+    def update_scroll(cls, content):
+        for socket in websockets:
+            socket.write_message({"scroll" : content[0]/float(content[1])})
+
     def open(self):
         if self not in websockets:
             websockets.append(self)
@@ -392,5 +397,6 @@ async def main(base_path):
     Publisher.subscribe("PushPull", "title", PushPull.update_title)
     Publisher.subscribe("PushPull", "course", PushPull.update_course)
     Publisher.subscribe("PushPull", "date", PushPull.update_date)
+    Publisher.subscribe("PushPull", "scroll", PushPull.update_scroll)
     application.listen(8888)
     await asyncio.Event().wait()

lua/MarkdownPreviewer/init.lua

@@ -43,7 +43,7 @@ function module.open()
         group = augroup,
         buffer = bufnr,
         callback = function()
-            server_connection:scroll(vim.fn.line('.'))
+            server_connection:scroll({vim.fn.line('.'), vim.fn.line('$')})
         end,
     })
 

template/index.html

@@ -77,6 +77,13 @@
                 Object.entries(data).forEach(([k,v]) => {
                     console.log(k,v);
                     switch (k) {
+                        case "scroll":
+                            var height = window.innerHeight
+                            || document.documentElement.clientHeight
+                            || document.body.clientHeight;
+
+                            window.scrollTo({left : 0, top: height * v, behavior: 'smooth'});
+                            break;
                         case "show":
                             change_body(v)
                             break;