remove window from scrolls

src/content/actions/operation.js

@@ -24,19 +24,19 @@ const exec = (operation) => {
       type: messages.FIND_PREV,
     }), '*');
   case operations.SCROLL_VERTICALLY:
-    return scrolls.scrollVertically(window, operation.count);
+    return scrolls.scrollVertically(operation.count);
   case operations.SCROLL_HORIZONALLY:
-    return scrolls.scrollHorizonally(window, operation.count);
+    return scrolls.scrollHorizonally(operation.count);
   case operations.SCROLL_PAGES:
-    return scrolls.scrollPages(window, operation.count);
+    return scrolls.scrollPages(operation.count);
   case operations.SCROLL_TOP:
-    return scrolls.scrollTop(window);
+    return scrolls.scrollTop();
   case operations.SCROLL_BOTTOM:
-    return scrolls.scrollBottom(window);
+    return scrolls.scrollBottom();
   case operations.SCROLL_HOME:
-    return scrolls.scrollHome(window);
+    return scrolls.scrollHome();
   case operations.SCROLL_END:
-    return scrolls.scrollEnd(window);
+    return scrolls.scrollEnd();
   case operations.FOLLOW_START:
     return window.top.postMessage(JSON.stringify({
       type: messages.FOLLOW_START,

src/content/scrolls.js

@@ -1,7 +1,7 @@
 const SCROLL_DELTA_X = 48;
 const SCROLL_DELTA_Y = 48;
 
-const isVisible = (win, element) => {
+const isVisible = (element) => {
   let rect = element.getBoundingClientRect();
   if (rect.width === 0 || rect.height === 0) {
     return false;
@@ -9,19 +9,19 @@ const isVisible = (win, element) => {
   if (rect.right < 0 && rect.bottom < 0) {
     return false;
   }
-  if (win.innerWidth < rect.left && win.innerHeight < rect.top) {
+  if (window.innerWidth < rect.left && window.innerHeight < rect.top) {
     return false;
   }
 
-  let { display, visibility } = win.getComputedStyle(element);
+  let { display, visibility } = window.getComputedStyle(element);
   if (display === 'none' || visibility === 'hidden') {
     return false;
   }
   return true;
 };
 
-const isScrollableStyle = (win, element) => {
-  let { overflowX, overflowY } = win.getComputedStyle(element);
+const isScrollableStyle = (element) => {
+  let { overflowX, overflowY } = window.getComputedStyle(element);
   return !(overflowX !== 'scroll' && overflowX !== 'auto' &&
     overflowY !== 'scroll' && overflowY !== 'auto');
 };
@@ -35,15 +35,15 @@ const isOverflowed = (element) => {
 // this method is called by each scrolling, and the returned value of this
 // method is not cached.  That does not cause performance issue because in the
 // most pages, the window is root element i,e, documentElement.
-const findScrollable = (win, element) => {
-  if (isScrollableStyle(win, element) && isOverflowed(element)) {
+const findScrollable = (element) => {
+  if (isScrollableStyle(element) && isOverflowed(element)) {
     return element;
   }
 
   let children = Array.prototype
-    .filter.call(element.children, e => isVisible(win, e));
+    .filter.call(element.children, e => isVisible(e));
   for (let child of children) {
-    let scrollable = findScrollable(win, child);
+    let scrollable = findScrollable(child);
     if (scrollable) {
       return scrollable;
     }
@@ -51,65 +51,65 @@ const findScrollable = (win, element) => {
   return null;
 };
 
-const scrollTarget = (win) => {
-  if (isOverflowed(win.document.documentElement)) {
-    return win.document.documentElement;
+const scrollTarget = () => {
+  if (isOverflowed(window.document.documentElement)) {
+    return window.document.documentElement;
   }
-  if (isOverflowed(win.document.body)) {
-    return win.document.body;
+  if (isOverflowed(window.document.body)) {
+    return window.document.body;
   }
-  let target = findScrollable(win, win.document.documentElement);
+  let target = findScrollable(window.document.documentElement);
   if (target) {
     return target;
   }
-  return win.document.documentElement;
+  return window.document.documentElement;
 };
 
-const scrollVertically = (win, count) => {
-  let target = scrollTarget(win);
+const scrollVertically = (count) => {
+  let target = scrollTarget();
   let x = target.scrollLeft;
   let y = target.scrollTop + SCROLL_DELTA_Y * count;
   target.scrollTo(x, y);
 };
 
-const scrollHorizonally = (win, count) => {
-  let target = scrollTarget(win);
+const scrollHorizonally = (count) => {
+  let target = scrollTarget();
   let x = target.scrollLeft + SCROLL_DELTA_X * count;
   let y = target.scrollTop;
   target.scrollTo(x, y);
 };
 
-const scrollPages = (win, count) => {
-  let target = scrollTarget(win);
+const scrollPages = (count) => {
+  let target = scrollTarget();
   let height = target.clientHeight;
   let x = target.scrollLeft;
   let y = target.scrollTop + height * count;
   target.scrollTo(x, y);
 };
 
-const scrollTop = (win) => {
-  let target = scrollTarget(win);
+const scrollTop = () => {
+  let target = scrollTarget();
   let x = target.scrollLeft;
   let y = 0;
   target.scrollTo(x, y);
 };
 
-const scrollBottom = (win) => {
-  let target = scrollTarget(win);
+const scrollBottom = () => {
+  let target = scrollTarget();
   let x = target.scrollLeft;
   let y = target.scrollHeight;
   target.scrollTo(x, y);
 };
 
-const scrollHome = (win) => {
-  let target = scrollTarget(win);
+const scrollHome = () => {
+  let target = scrollTarget();
   let x = 0;
   let y = target.scrollTop;
   target.scrollTo(x, y);
 };
 
-const scrollEnd = (win) => {
-  let target = scrollTarget(win);
+const scrollEnd = () => {
+  let target = scrollTarget();
   let x = target.scrollWidth;
   let y = target.scrollTop;
   target.scrollTo(x, y);