scroll by pages

2 files changed, 11 insertions, 1 deletions

diff --git a/src/content/index.js b/src/content/index.js
index b233e27..feb169f 100644
--- a/src/content/index.js
+++ b/src/content/index.js
@@ -45,6 +45,9 @@ const invokeEvent = (action) => {
   case actions.SCROLL_LINES:
     scrolls.scrollLines(window, action[1]);
     break;
+  case actions.SCROLL_PAGES:
+    scrolls.scrollPages(window, action[1]);
+    break;
   case actions.SCROLL_TOP:
     scrolls.scrollTop(window, action[1]);
     break;
diff --git a/src/content/scrolls.js b/src/content/scrolls.js
index ef112a4..540703e 100644
--- a/src/content/scrolls.js
+++ b/src/content/scrolls.js
@@ -6,6 +6,13 @@ const scrollLines = (page, count) => {
   page.scrollTo(x, y);
 };
 
+const scrollPages = (page, count) => {
+  let height = page.innerHeight;
+  let x = page.scrollX;
+  let y = page.scrollY + height * count;
+  page.scrollTo(x, y);
+};
+
 const scrollTop = (page) => {
   let x = page.scrollX;
   let y = 0;
@@ -18,4 +25,4 @@ const scrollBottom = (page) => {
   page.scrollTo(x, y);
 };
 
-export { scrollLines, scrollTop, scrollBottom }
+export { scrollLines, scrollPages, scrollTop, scrollBottom }