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remove window from scrolls

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This commit is contained in:
Shin'ya Ueoka 2018-01-13 14:48:53 +09:00
parent 4d4a959162
commit 057a0b8a46
2 changed files with 37 additions and 37 deletions
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60
src/content/scrolls.js
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@ -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);