From d63ef1753821bc9c916190b779e8ea72b9ef2ca6 Mon Sep 17 00:00:00 2001
From: Lu Wang <coolwanglu@gmail.com>
Date: Tue, 18 Sep 2012 15:27:17 +0800
Subject: [PATCH] improve scroll.js

---
 share/manifest              |  4 ++--
 share/scroll.js             | 34 ++++++++++++++++++++--------------
 src/HTMLRenderer/general.cc |  1 -
 3 files changed, 22 insertions(+), 17 deletions(-)

diff --git a/share/manifest b/share/manifest
index 8b3d0a2..e5bf5aa 100644
--- a/share/manifest
+++ b/share/manifest
@@ -24,7 +24,7 @@
 @base.css
 $css
 @jquery.js
-#@hide_pages.js
+@hide_pages.js
 
 """
 <title></title>
@@ -39,7 +39,7 @@ $pages
 </div>
 """
 
-#@scroll.js
+@scroll.js
 
 """
 </body>
diff --git a/share/scroll.js b/share/scroll.js
index c9692f4..b820593 100644
--- a/share/scroll.js
+++ b/share/scroll.js
@@ -1,3 +1,10 @@
+/*
+ * scroll.js
+ * render only necessary pages
+ *
+ * by Hongliang TIAN
+ * modifiedy by Lu WANG
+ */
 $(function() {
   var $pages = $(".p"), 
       $pageWrappers = $(".b"),
@@ -37,23 +44,22 @@ $(function() {
   }
 
   // Listen to scrolling events to render proper pages
-  var scrollTimer = null;
+  var scrolled = false;
+  var last_scroll_time = Date.now();
   $("#pdf-main").scroll(function() {
-    // Now
-    lastScrollTime = Date.now();
-    // Make sure at most one timer runs
-    clearInterval(scrollTimer);
-    // Check when scrolling stops
-    scrollTimer = setInterval(function() {
-      // If scrolling pauses 200+ms
-      if (Date.now() - lastScrollTime > 200) {
-        clearInterval(scrollTimer);
-        // Only render pages that are or will be visible
-        selectiveRender();
-      }
-    }, 200);
+    scrolled = true;
+    last_scroll_time = Date.now();
   });
 
+  setInterval(function() {
+    // If scrolling pauses 200+ms
+    if (scrolled && (Date.now() - last_scroll_time> 100)) {
+      scrolled = false;
+      // Only render pages that are or will be visible
+      selectiveRender();
+    }
+  }, 100);
+
   // Trigger the event
   $("#pdf-main").scroll();
 });
diff --git a/src/HTMLRenderer/general.cc b/src/HTMLRenderer/general.cc
index a048708..290fd6c 100644
--- a/src/HTMLRenderer/general.cc
+++ b/src/HTMLRenderer/general.cc
@@ -56,7 +56,6 @@ HTMLRenderer::~HTMLRenderer()
 }
 
 static GBool annot_cb(Annot *, void *) {
-    return true;
     return false;
 };