scroll by pages

src/background/key-queue.js

@@ -7,6 +7,12 @@ const DEFAULT_KEYMAP = [
   { keys: [{ code: KeyboardEvent.DOM_VK_O, shift: true }], action: [ actions.CMD_TABS_OPEN, true ]},
   { keys: [{ code: KeyboardEvent.DOM_VK_K }], action: [ actions.SCROLL_LINES, -1 ]},
   { keys: [{ code: KeyboardEvent.DOM_VK_J }], action: [ actions.SCROLL_LINES, 1 ]},
+  { keys: [{ code: KeyboardEvent.DOM_VK_E, ctrl: true }], action: [ actions.SCROLL_LINES, -1 ]},
+  { keys: [{ code: KeyboardEvent.DOM_VK_Y, ctrl: true }], action: [ actions.SCROLL_LINES, 1 ]},
+  { keys: [{ code: KeyboardEvent.DOM_VK_U, ctrl: true }], action: [ actions.SCROLL_PAGES, -0.5 ]},
+  { keys: [{ code: KeyboardEvent.DOM_VK_D, ctrl: true }], action: [ actions.SCROLL_PAGES, 0.5 ]},
+  { keys: [{ code: KeyboardEvent.DOM_VK_B, ctrl: true }], action: [ actions.SCROLL_PAGES, -1 ]},
+  { keys: [{ code: KeyboardEvent.DOM_VK_F, ctrl: true }], action: [ actions.SCROLL_PAGES, 1 ]},
   { keys: [{ code: KeyboardEvent.DOM_VK_G }, { code: KeyboardEvent.DOM_VK_G }], action: [ actions.SCROLL_TOP ]},
   { keys: [{ code: KeyboardEvent.DOM_VK_G, shift: true }], action: [ actions.SCROLL_BOTTOM ]},
   { keys: [{ code: KeyboardEvent.DOM_VK_D }], action: [ actions.TABS_CLOSE ]},

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;

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 }

src/shared/actions.js

@@ -6,6 +6,7 @@ export const TABS_PREV = 'tabs.prev';
 export const TABS_NEXT = 'tabs.next';
 export const TABS_RELOAD = 'tabs.reload';
 export const SCROLL_LINES = 'scroll.lines';
+export const SCROLL_PAGES = 'scroll.pages';
 export const SCROLL_TOP = 'scroll.top';
 export const SCROLL_BOTTOM = 'scroll.bottom';
 export const FOLLOW_START = 'follow.start';
@@ -30,6 +31,7 @@ const CONTENT_ACTION_SET = new Set([
   CMD_OPEN,
   CMD_TABS_OPEN,
   SCROLL_LINES,
+  SCROLL_PAGES,
   SCROLL_TOP,
   SCROLL_BOTTOM,
   FOLLOW_START,