画像切り替え switcher スイッチャー html挿入式リンクボタン付き

/**
 * 画像切り替え
 *
 * @author ao-system, Inc.
 * @date 2022-10-06
 * @date 2024-01-16
 * @date 2024-01-17 Rewrite the code using the class syntax.
 *

<section class="switchpanel">
	<div>
		<div id="switchPanelStage"></div>
	</div>
</section>

<style>
section.switchpanel {
	background-color: #000;
	> div {
		max-width: 1920px;
		margin: 0 auto;
		overflow: hidden;
		> #switchPanelStage {
			user-select: none;
			display: grid;
			grid-template-rows: 1fr;
			grid-template-columns: 1fr;
			> div {
				grid-row: 1/2;
				grid-column: 1/2;
				&:nth-of-type(1) {
					z-index: 0;
				}
				&:nth-of-type(2) {
					z-index: 1;
					transition: 0.5s;
					cursor: ew-resize;
				}
				&:nth-of-type(3) {
					z-index: 2;
					justify-self: flex-end;
					align-self: end;
					display: flex;
					justify-content: center;
					align-items: center;
					column-gap: 5px;
					padding: 0 20px 17px 0;
					@media (width < 670px) {
						column-gap: 3px;
						padding: 0 4px 4px 0;
						> span {
							> img {
								width: 16px;
							}
						}
					}
					> span {
						cursor: pointer;
						> img:nth-of-type(1) {
							display: block;
						}
						> img:nth-of-type(2) {
							display: none;
						}
						&.on {
							> img:nth-of-type(1) {
								display: none;
							}
							> img:nth-of-type(2) {
								display: block;
							}
						}
					}
				}
				//values
				> article {
					position: relative;
					> picture {
						> img {
							width: 100%;
						}
					}
					> a {
						text-decoration: none;
						position: absolute;
						&.button1 {
							left: 50px;
							top: 50px;
						}
						&.button2 {
							right: 80px;
							top: 100px;
						}
						&.button3 {
							left: 100px;
							bottom: 50px;
						}
						> img {
							max-width: 100%;
						}
					}
				}
			}
		}
	}
}
</style>
 *
 */

(() => {
	'use strict';
	class SwitchImage {
		#constProperties = [
			{prop: 'stage',					value: document.getElementById('switchPanelStage')},
			{prop: 'layer0',				value: document.createElement('div')},
			{prop: 'layer1',				value: document.createElement('div')},
			{prop: 'layerNav',				value: document.createElement('div')},
			{prop: 'markPause',				value: './image/panel_pause.svg'},
			{prop: 'markPlay',				value: './image/panel_play.svg'},
			{prop: 'markNavOn',				value: './image/panel_ball_on.svg'},
			{prop: 'markNavOff',			value: './image/panel_ball_off.svg'},
			{prop: 'buttonPause',			value: document.createElement('span')},
			{prop: 'buttonPlay',			value: document.createElement('span')},
			{prop: 'imageChangeInterval',	value: 4000},	//画像と画像の時間間隔
			{prop: 'slideWidth',			value: 50},		//切り替わるスライド幅
			{prop: 'slideTime',				value: 600},	//スライド時間cssの0.5sよりちょっと長め
			{prop: 'swipeShreshold',		value: 50},		//スワイプ判定幅
		];
		#loopTimeoutId			= null;		//自動動作のタイマー
		#isBusy					= false;	//動作中
		#pausePlayFlag			= true;		//falseで停止
		#focusFlag				= true;		//フォーカスが外れている時は動作させないため
		#valueIndex				= 0;		//this.#valuesの添え字
		#slideDirection			= 1;		//1|-1	正方向,逆方向
		#swipeStartX			= 0;		//スワイプ開始位置
		#isSwiping				= false;	//スワイプ中
		#values					= [];
		//
		constructor(values) {
			this.#values = values;
			this.#constProperties.forEach((obj) => Object.defineProperty(this, obj.prop, {value:obj.value, writable:false}));
			this.#init();
		}
		#init() {
			this.stage.appendChild(this.layer0);
			this.stage.appendChild(this.layer1);
			this.stage.appendChild(this.layerNav);
			//this.#values = shuffle(this.#values);	//シャッフルさせる場合
			//window.addEventListener('focus',() => { this.#focusFlag = true;});	//out focusで停止させる場合の処理
			//window.addEventListener('blur',() => { this.#focusFlag = false;});	//out focusで停止させる場合の処理
			//
			this.layer0.innerHTML = this.#values[0];
			this.layer1.innerHTML = this.#values[0];
			this.layer1.animate(
				[{opacity: 0}],
				{delay:0,duration:0, easing:'linear',fill:'forwards', },
			);
			this.#preload();
			this.#initNav();
			this.#initSwipe();
			this.#navOn();
			this.#autoSlide();
		}
		#shuffle(array) {
			for (let i = array.length - 1; i > 0; i--) {
				const j = Math.floor(Math.random() * (i + 1));
				[array[i], array[j]] = [array[j], array[i]];
			}
			return array;
		}
		//プリロード 最後に最初の表示になるように後ろから前へプリロードする
		#preload() {
			for (let i = this.#values.length - 1; i >= 0; i--) {
				setTimeout(() => {
					this.layer1.innerHTML = this.#values[i];
				},10);
			}
		}
		#initNav() {
			this.#values.map((x,index) => {
				const span = document.createElement('span');
				span.addEventListener('click',() => {
					if (this.#isBusy) {
						return;
					}
					this.#slideAction(index);
				});
				span.innerHTML = '<img src="' + this.markNavOff + '"><img src="' + this.markNavOn + '">';
				this.layerNav.appendChild(span);
			});
			const pauseImg = new Image();
			pauseImg.src = this.markPause;
			this.buttonPause.appendChild(pauseImg);
			this.layerNav.appendChild(this.buttonPause);
			const playImg = new Image();
			playImg.src = this.markPlay;
			this.buttonPlay.appendChild(playImg);
			this.layerNav.appendChild(this.buttonPlay);
			this.buttonPlay.style.display = 'none';
			this.buttonPause.addEventListener('click',() => this.#setPause());
			this.buttonPlay.addEventListener('click',() => this.#setPlay());
		}
		#initSwipe() {
			this.layer1.addEventListener('click', (e) => { e.preventDefault();});
			this.layer1.addEventListener('mousedown', (e) => { this.#swipeStart(e.clientX); });
			this.layer1.addEventListener('mouseup', (e) => { this.#swipeEnd(e.target, e.clientX); });
			this.layer1.addEventListener('touchstart', (e) => { this.#swipeStart(e.touches[0].clientX); });
			this.layer1.addEventListener('touchend', (e) => { this.#swipeEnd(e.target, e.changedTouches[0].clientX); });
		}
		#swipeStart(positionX) {
			if (this.#isBusy) {
				return;
			}
			this.#swipeStartX = positionX;
			this.layer1.style.cursor = 'grabbing';
			this.#isSwiping = true;
		}
		#swipeEnd(targetElm,positionX) {
			if (this.#isSwiping == false) {
				return;
			}
			if (this.#swipeStartX - positionX > this.swipeShreshold) {
				this.#slideAction(this.#withinRange(this.#valueIndex + 1));
			} else if (this.#swipeStartX - positionX < -this.swipeShreshold) {
				this.#slideDirection = -1;
				this.#slideAction(this.#withinRange(this.#valueIndex - 1));
			} else {
				let attrLink = null;
				let attrTarget = null;
				let targetElm2 = targetElm;
				for (let i = 0; i < 9; i++) {	//画像からこの回数の親を調べる
					targetElm2 = targetElm2.parentNode;
					if (targetElm2 == this.layer1) {
						break;	//リンクが無かった場合
					}
					attrLink = targetElm2.getAttribute('href');
					if (attrLink) {
						attrTarget = targetElm2.getAttribute('target');
						break;	//調査完了
					}
				}
				if (attrLink) {
					if (attrTarget) {
						window.open(attrLink, attrTarget);
					} else {
						window.location.href = attrLink;
					}
					return;
				}
			}
			this.layer1.style.cursor = '';
			this.#isSwiping = false;
		}
		#setPause() {
			this.#pausePlayFlag = false;
			this.buttonPause.style.display = 'none';
			this.buttonPlay.style.display = 'block';
		}
		#setPlay() {
			this.#pausePlayFlag = true;
			this.buttonPause.style.display = 'block';
			this.buttonPlay.style.display = 'none';
		}
		#slideForward() {
			if (this.#isBusy) {
				return;
			}
			this.#isBusy = true;
			this.#navOn();
			this.layer1.innerHTML = this.#values[this.#valueIndex];
			this.layer1.animate(
				[
					{opacity: 0,transform:'translateX(' + (this.slideWidth * this.#slideDirection) + 'px)'},
					{opacity: 1,transform:'translateX(0px)'},
				],
				{delay:0,duration:this.slideTime, easing:'ease-out',fill:'forwards', },
			);
			setTimeout(() => {
				this.layer0.innerHTML = this.#values[this.#valueIndex];
				this.layer1.animate(
					[{opacity: 0}],
					{delay:100,duration:0, easing:'linear',fill:'forwards', },
				);
				this.#slideDirection = 1;
				setTimeout(() => {
					this.#isBusy = false;
				},100);
			},this.slideTime);
		}
		#autoSlide() {
			this.#loopTimeoutId = setTimeout(() => {
				if (this.#pausePlayFlag && this.#focusFlag) {
					this.#slideAction();
				} else {
					this.#autoSlide();
				}
			}, this.imageChangeInterval - this.slideTime);
		}
		#slideAction(num = this.#valueIndex + 1) {
			clearTimeout(this.#loopTimeoutId);
			this.#valueIndex = this.#withinRange(num);
			this.#slideForward();
			this.#autoSlide();
		}
		#navOn() {
			const spans = this.layerNav.querySelectorAll('span');
			spans.forEach((elm) => elm.classList.remove('on'));
			spans[this.#valueIndex].classList.add('on');
		}
		#withinRange(nextNumber) {
			const num = (nextNumber >= 0) ? nextNumber : this.#values.length - 1;
			return num % this.#values.length;
		}
	}
	//
	new SwitchImage(
		[
			'<article><picture><source srcset="./image/panel01b.webp" media="(width < 700px)"><img src="./image/panel01.webp" draggable="false"></picture><a class="button1" href="https://ao-system.net/" target="_blank"><img src="./image/button1.svg"></a></article>',
			'<article><picture><source srcset="./image/panel02b.webp" media="(width < 700px)"><img src="./image/panel02.webp" draggable="false"></picture><a class="button2" href="https://www.aosystem.co.jp/" target="_blank"><img src="./image/button2.svg"></a></article>',
			'<article><picture><source srcset="./image/panel03b.webp" media="(width < 700px)"><img src="./image/panel03.webp" draggable="false"></picture><a class="button3" href="https://www.aosystem.co.jp/" target="_blank"><img src="./image/button2.svg"></a></article>',
			'<article><picture><source srcset="./image/panel04b.webp" media="(width < 700px)"><img src="./image/panel04.webp" draggable="false"></picture><a class="button1" href="https://www.google.com/" target="_blank"><img src="./image/button3.svg"></a></article>',
			'<article><picture><source srcset="./image/panel05b.webp" media="(width < 700px)"><img src="./image/panel05.webp" draggable="false"></picture></article>',
			'<article><picture><source srcset="./image/panel06b.webp" media="(width < 700px)"><img src="./image/panel06.webp" draggable="false"></picture></article>',
		]
	);
})();