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implement simple scrolling

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This commit is contained in:
Shin'ya Ueoka 2017-08-12 23:01:36 +09:00
parent 8e5ceebf61
commit 6bdacc7758
3 changed files with 56 additions and 3 deletions
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27
src/content/scrolls.js Normal file
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@ -0,0 +1,27 @@
const SCROLL_DELTA = 48;
const scrollUp = (page) => {
let x = page.scrollX;
var y = page.scrollY - SCROLL_DELTA;
page.scrollTo(x, y);
};
const scrollDown = (page) => {
let x = page.scrollX;
var y = page.scrollY + SCROLL_DELTA;
page.scrollTo(x, y);
};
const scrollToTop = (page) => {
let x = page.scrollX;
var y = page.scrollMaxY;
page.scrollTo(x, y);
};
const scrollToBottom = (page) => {
let x = page.scrollX;
var y = 0;
page.scrollTo(x, y);
};
export { scrollUp, scrollDown, scrollToTop, scrollToBottom }