Fix broken drag scrolling when left is out of viewport

Related to #390
9 years ago · 3b134d6193
parent e9024292cd
commit 3b134d6193
1 changed files with 5 additions and 1 deletions
--- a/src/js/plugin/handler/drag-scrollbar.js
+++ b/src/js/plugin/handler/drag-scrollbar.js
@ -15,7 +15,11 @@ function bindMouseScrollXHandler(element, i) {

  function updateScrollLeft(deltaX) {
    var newLeft = currentLeft + (deltaX * i.railXRatio);
-    var maxLeft = i.scrollbarXRail.getBoundingClientRect().left + (i.railXRatio * (i.railXWidth - i.scrollbarXWidth));
+    var scrollbarXLeft = i.scrollbarXRail.getBoundingClientRect().left;
+    if (scrollbarXLeft < 0) {
+      scrollbarXLeft = 0;
+    }
+    var maxLeft = scrollbarXLeft + (i.railXRatio * (i.railXWidth - i.scrollbarXWidth));

    if (newLeft < 0) {
      i.scrollbarXLeft = 0;