From 1f4724edbaaddccf46aa3157abb0fa9fb71eece2 Mon Sep 17 00:00:00 2001
From: pacien
Date: Thu, 26 Oct 2023 20:40:25 +0200
Subject: init: simplify loading file path from hash

---
 beamer/viewer/init.js   | 18 ------------------
 beamer/viewer/viewer.js | 20 +++++++++++++++++++-
 index.html              |  2 +-
 3 files changed, 20 insertions(+), 20 deletions(-)

diff --git a/beamer/viewer/init.js b/beamer/viewer/init.js
index d634c94..a6ea7be 100644
--- a/beamer/viewer/init.js
+++ b/beamer/viewer/init.js
@@ -18,15 +18,6 @@
 
 "use strict";
 
-const params = function() {
-  const queryDict = {};
-  location.hash.substr(1).split("&").forEach(item => {
-    const pair = item.split("=");
-    queryDict[pair[0]] = pair[1];
-  });
-  return queryDict;
-}();
-
 function isController() {
   return window.opener == null || window.opener.location.href != window.location.href;
 }
@@ -41,16 +32,7 @@ function initCache() {
 
 function init() {
   initCache();
-
   const viewer = new Viewer();
-
-  if ("file" in params)
-    viewer.loadFromUrl(params["file"]);
-}
-
-function load(file) {
-  location.hash = "file=" + file;
-  location.reload();
 }
 
 if (isController())
diff --git a/beamer/viewer/viewer.js b/beamer/viewer/viewer.js
index 21b369a..28c0187 100644
--- a/beamer/viewer/viewer.js
+++ b/beamer/viewer/viewer.js
@@ -66,7 +66,7 @@ class Viewer {
     this.fileInput.files = dummy.files;
   }
 
-  loadFromUrl(url) {
+  _loadFromUrl(url) {
     this._setFileName(url);
     this._setPresentation(url);
   }
@@ -94,5 +94,23 @@ class Viewer {
       event.preventDefault();
       event.stopPropagation();
     });
+
+    window.addEventListener('load', () => this._on_hash_change());
+    window.addEventListener('hashchange', () => this._on_hash_change());
+  }
+
+  _on_hash_change() {
+    const params = this._hash_params();
+    if ("file" in params)
+      this._loadFromUrl(params["file"]);
+  }
+
+  _hash_params() {
+    const queryDict = {};
+    location.hash.substr(1).split("&").forEach(item => {
+      const pair = item.split("=");
+      queryDict[pair[0]] = pair[1];
+    });
+    return queryDict;
   }
 }
diff --git a/index.html b/index.html
index 2f261ff..3df5997 100644
--- a/index.html
+++ b/index.html
@@ -73,7 +73,7 @@
         <p>
           Select a PDF file to open,
           or try with
-          <a href="#file=sample/demo.pdf" onclick="load('sample/demo.pdf')">demo slides</a>.
+          <a href="#file=sample/demo.pdf">demo slides</a>.
         </p>
 
         <input id="fileInput" type="file" multiple="false" accept="application/pdf" disabled />
-- 
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