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Refactor

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This commit is contained in:
syuilo 2017-11-19 00:07:36 +09:00
parent bc88f4a883
commit 382daee033
1 changed files with 7 additions and 3 deletions
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10
src/web/app/desktop/scripts/scroll-follower.ts
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@ -32,8 +32,8 @@ export default class ScrollFollower {
const windowTop = window.scrollY + this.topPadding;
const rect = this.follower.getBoundingClientRect();
//const followerHeight = rect.height + this.containerTop;
const followerBottom = (rect.top + window.scrollY) + rect.height;
const screenHeight = window.innerHeight - this.topPadding;
// スクロールの上部(+余白)がフォロワーコンテナの上部よりも上方にある
if (window.scrollY + this.topPadding < this.containerTop) {
@ -43,15 +43,19 @@ export default class ScrollFollower {
}
// スクロールの下部がフォロワーの下部よりも下方にある かつ 表示領域の縦幅がフォロワーの縦幅よりも狭い
if (windowBottom > followerBottom && rect.height > (window.innerHeight - this.topPadding)) {
if (windowBottom > followerBottom && rect.height > screenHeight) {
// フォロワーの下部をスクロール下部に合わせる
const top = (windowBottom - rect.height) - this.containerTop;
(this.follower.parentNode as any).style.marginTop = `${top}px`;
return;
}
// スクロールの上部(+余白)がフォロワーの上部よりも上方にある または 表示領域の縦幅がフォロワーの縦幅よりも広い
} else if ((windowTop < rect.top + window.scrollY || rect.height < (window.innerHeight - this.topPadding))) {
if (windowTop < rect.top + window.scrollY || rect.height < screenHeight) {
// フォロワーの上部をスクロール上部(+余白)に合わせる
const top = windowTop - this.containerTop;
(this.follower.parentNode as any).style.marginTop = `${top}px`;
return;
}
}
}