# scroll
# progress
If the element is in the visible range, process according to the progress rate.
progress:
0
0
class ScrollRevealProgress {
constructor(target, callbackIn, callbackOut, offset = 150, wrapper = window, always = true) {
/**
* ターゲット要素
* @type {HTMLElement}
*/
this.target = target;
/**
* ラッパー要素
* @type {HTMLElement}
*/
this.wrapper = wrapper;
/**
* 要素が見え始めてからのオフセット
* @type {number}
*/
this.offset = offset;
/**
* 見え始めたときのコールバック
* @type {Function}
*/
this.callbackIn = typeof callbackIn === 'function' ? callbackIn : () => {
};
/**
* 見切れたときのコールバック関数
* @type {Function}
*/
this.callbackOut = typeof callbackOut === 'function' ? callbackOut : () => {
};
/**
* 常にコールバック関数を実行するかどうか
* false だと スクロール値が変わった時にだけ実行する
* @type {boolean}
*/
this.always = always;
/**
* 可視範囲に入っているかの審議値
* @type {boolean}
*/
this.show = false;
/**
* ラッパーの高さ
* @type {number}
*/
this.wrapHeight = 0;
/**
* ラッパーからターゲットまでの距離
* @type {number}
*/
this.offsetTop = 0;
/**
* ターゲットの高さ
* @type {number}
*/
this.targetHeight = 0;
/**
* コールバック関数に渡す進捗率 0 ~ 1
* @type {number}
*/
this.progress = 0;
/**
* requestAnimationFrame の id
* @type {number}
*/
this.animationId = 0;
this.init();
return this;
}
get scrollY() {
return this._scrollY;
}
set scrollY(value) {
if (this._scrollY === value && !this.always) {
return;
}
// スクロール値が変わった時にだけ実行
this.check();
this._scrollY = value;
}
/**
* initialize
*/
init() {
const resizeHandle = () => this.resize();
window.addEventListener('resize', resizeHandle);
this.getItemInfo();
this.play();
}
/**
* ターゲットとラッパーの 高さと位置を取得する
*/
getItemInfo() {
// console.log('getItemInfo');
// ラッパーの高さをセット
this.wrapHeight = (this.wrapper === window) ? window.innerHeight : this.wrapper.offsetHeight;
const rect = this.target.getBoundingClientRect();
// ラッパーが window 以外の時はラッパーのオフセットを引く
if (this.wrapper === window) {
this.offsetTop = rect.top;
} else {
const _rect = this.wrapper.getBoundingClientRect();
this.offsetTop = rect.top - _rect.top;
}
//ターゲットの高さをセット
this.targetHeight = this.target.offsetHeight;
}
play() {
// スクロール値
this.scrollY = this.wrapper === window ? this.wrapper.pageYOffset : this.wrapper.scrollTop;
this.animationId = requestAnimationFrame(() => this.play());
}
check() {
this.show = (this.scrollY + this.wrapHeight > this.offsetTop + this.offset) && (this.scrollY < this.offsetTop + this.targetHeight);
const value = this.scrollY + this.wrapHeight - this.offsetTop - this.offset;
this.progress = value / (this.wrapHeight - this.offset + this.targetHeight);
if (this.show) {
this.callbackIn.call(this, this.progress);
} else {
this.callbackOut.call(this, this.progress);
}
}
resize() {
this.getItemInfo();
}
destroy() {
cancelAnimationFrame(this.animationId);
const resizeHandle = () => this.resize();
window.removeEventListener('resize', resizeHandle);
this.target = null;
this.wrapper = null;
this.offset = 0;
this.callbackIn = null;
this.callbackOut = null;
this.show = false;
this.wrapHeight = 0;
this.offsetTop = 0;
this.targetHeight = 0;
this.progress = 0;
this.animationId = 0;
}
}
export default ScrollRevealProgress;
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# color
background color
import ScrollRevealScript from './ScrollRevealScript';
import math from './math';
import chroma from 'chroma-js';
import {TweenMax} from 'gsap';
new ScrollRevealScript(this.$refs.target, progress => {
TweenMax.set(this.$refs.target, {
backgroundColor: chroma.mix( chroma.hsl(110, .75, math.map(progress, 0, 1, .45, .7)), chroma.hsl(240, .75, math.map(progress, 0, 1, .45, .7)), progress, 'hsl').css()
})
}, null, 100, this.$refs.wrap);
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# transform
Transform elements according to scroll.
Apply easing to transforming changes
transform
const easing = .1;
const updateValue = {
scaleY: 0,
rotationX: 0,
y: 0,
};
new ScrollRevealScript(this.$refs.target, progress => {
updateValue.scaleY += (math.map(Math.abs(progress - .5), 0, .5, 1, 1.1) - updateValue.scaleY) * easing;
updateValue.rotationX += (math.map(progress, 0, 1, 60, -60) - updateValue.rotationX) * easing;
updateValue.y += (math.map(progress, 0, 1, 100, -100) - updateValue.y) * easing;
TweenMax.set(this.$refs.target, {
scaleY: updateValue.scaleY,
rotationX: updateValue.rotationX,
y: updateValue.y,
});
}, null, -150, this.$refs.wrap);
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