@joelmturner/zine-viewer-web-component/dist/zine-viewer.es.js

A web component for viewing zines or small books.

/**
 * @license
 * Copyright 2019 Google LLC
 * SPDX-License-Identifier: BSD-3-Clause
 */
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/**
 * @license
 * Copyright 2017 Google LLC
 * SPDX-License-Identifier: BSD-3-Clause
 */
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    i && this.element.removeEventListener(this.name, this, s), o && this.element.addEventListener(this.name, this, e), this._$AH = e;
  }
  handleEvent(e) {
    var t;
    typeof this._$AH == "function" ? this._$AH.call(((t = this.options) == null ? void 0 : t.host) ?? this.element, e) : this._$AH.handleEvent(e);
  }
}
class Pe {
  constructor(e, t, s) {
    this.element = e, this.type = 6, this._$AN = void 0, this._$AM = t, this.options = s;
  }
  get _$AU() {
    return this._$AM._$AU;
  }
  _$AI(e) {
    v(this, e);
  }
}
const k = w.litHtmlPolyfillSupport;
k == null || k(U, O), (w.litHtmlVersions ?? (w.litHtmlVersions = [])).push("3.2.1");
const xe = (n, e, t) => {
  const s = (t == null ? void 0 : t.renderBefore) ?? e;
  let i = s._$litPart$;
  if (i === void 0) {
    const o = (t == null ? void 0 : t.renderBefore) ?? null;
    s._$litPart$ = i = new O(e.insertBefore(x(), o), o, void 0, t ?? {});
  }
  return i._$AI(n), i;
};
/**
 * @license
 * Copyright 2017 Google LLC
 * SPDX-License-Identifier: BSD-3-Clause
 */
class P extends A {
  constructor() {
    super(...arguments), this.renderOptions = { host: this }, this._$Do = void 0;
  }
  createRenderRoot() {
    var t;
    const e = super.createRenderRoot();
    return (t = this.renderOptions).renderBefore ?? (t.renderBefore = e.firstChild), e;
  }
  update(e) {
    const t = this.render();
    this.hasUpdated || (this.renderOptions.isConnected = this.isConnected), super.update(e), this._$Do = xe(t, this.renderRoot, this.renderOptions);
  }
  connectedCallback() {
    var e;
    super.connectedCallback(), (e = this._$Do) == null || e.setConnected(!0);
  }
  disconnectedCallback() {
    var e;
    super.disconnectedCallback(), (e = this._$Do) == null || e.setConnected(!1);
  }
  render() {
    return b;
  }
}
var te;
P._$litElement$ = !0, P.finalized = !0, (te = globalThis.litElementHydrateSupport) == null || te.call(globalThis, { LitElement: P });
const I = globalThis.litElementPolyfillSupport;
I == null || I({ LitElement: P });
(globalThis.litElementVersions ?? (globalThis.litElementVersions = [])).push("4.1.1");
/**
 * @license
 * Copyright 2017 Google LLC
 * SPDX-License-Identifier: BSD-3-Clause
 */
const Ce = (n) => (e, t) => {
  t !== void 0 ? t.addInitializer(() => {
    customElements.define(n, e);
  }) : customElements.define(n, e);
};
var Ue = Object.defineProperty, Oe = Object.getOwnPropertyDescriptor, He = (n, e, t, s) => {
  for (var i = s > 1 ? void 0 : s ? Oe(e, t) : e, o = n.length - 1, r; o >= 0; o--)
    (r = n[o]) && (i = (s ? r(e, t, i) : r(i)) || i);
  return s && i && Ue(e, t, i), i;
};
let B = class extends P {
  constructor() {
    super(...arguments), this.currentPage = 0;
  }
  resizeContainer() {
    var h, u;
    const n = (h = this.shadowRoot) == null ? void 0 : h.querySelector(
      ".container"
    ), e = (u = this.shadowRoot) == null ? void 0 : u.querySelector(".wrapper");
    if (!n || !e) return;
    const t = parseInt(
      getComputedStyle(this).getPropertyValue("--canvas-padding")
    ), s = parseInt(
      getComputedStyle(this).getPropertyValue("--page-width")
    ), i = parseInt(
      getComputedStyle(this).getPropertyValue("--page-height")
    ), o = s * 2, r = e.clientWidth - t * 2, l = e.clientHeight - t * 2, a = r / o, c = l / i, d = Math.min(a, c);
    n.style.width = `${o * d}px`, n.style.height = `${i * d}px`;
  }
  firstUpdated() {
    var l, a, c;
    const n = Array.from(((l = this.shadowRoot) == null ? void 0 : l.querySelectorAll(".page")) || []), e = (a = this.shadowRoot) == null ? void 0 : a.getElementById("prev"), t = (c = this.shadowRoot) == null ? void 0 : c.getElementById("next");
    this.resizeContainer(), new ResizeObserver(() => {
      this.resizeContainer();
    }).observe(this);
    const i = () => {
      e.disabled = this.currentPage === 0, t.disabled = this.currentPage === n.length;
    }, o = (d) => {
      n.forEach((h, u) => {
        let f;
        d ? u === 0 && this.currentPage <= 1 ? f = n.length + 1 : u < this.currentPage ? f = n.length - (this.currentPage - u) : f = n.length - u : u === n.length - 1 && this.currentPage >= n.length - 1 ? f = n.length + 1 : u === this.currentPage ? f = n.length : u < this.currentPage ? f = u : f = n.length - u, h.style.zIndex = f.toString();
      });
    }, r = (d) => {
      d ? (n[this.currentPage].classList.add("flipped"), this.currentPage++) : (this.currentPage--, n[this.currentPage].classList.remove("flipped")), o(d), i();
    };
    e.addEventListener("click", () => r(!1)), t.addEventListener("click", () => r(!0)), o(!0), i();
  }
  render() {
    const n = Array.from(this.children).map((e, t) => {
      const s = e.getAttribute("img-src"), i = e.getAttribute("back-img-src");
      return { imgSrc: s, backImgSrc: i, index: t };
    });
    return X`
      <div class="wrapper">
        <div class="container">
          <div class="zine">
            ${n.map(
      (e) => X`<div
                class="page"
                data-page="${e.index + 1}"
                style="z-index: ${5 - e.index}"
              >
                <div class="front"><img src="${e.imgSrc}" /></div>
                <div class="back"><img src="${e.backImgSrc}" /></div>
              </div>`
    )}
            <button id="prev"></button>
            <button id="next"></button>
          </div>
        </div>
      </div>
    `;
  }
};
B.styles = le`
    :host {
      --canvas-bg-color: transparent;
      --canvas-padding: 25px;
      --page-width: 291px;
      --page-height: 450px;
      --spread-width: calc(var(--page-width) * 2);
      --page-border-radius: 5%;
      --page-color: #111;
      --page-bg-color: transparent;
      --transition-duration: 1s;
      display: block;
      width: 100%;
      height: 100%;
    }

    * {
      box-sizing: border-box;
    }

    .wrapper {
      width: 100%;
      height: 100%;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: var(--canvas-padding);
    }

    .container {
      display: flex;
      justify-content: flex-end;
      align-items: center;
      position: relative;
      margin: 0 auto;
      background: var(--canvas-bg-color);
      font-family: Arial, sans-serif;
      border-radius: var(--page-border-radius);
    }

    .zine {
      position: relative;
      width: 100%;
      height: 100%;
      perspective: calc(var(--page-width) * 5);
    }

    .page {
      position: absolute;
      right: 0;
      width: 50%;
      height: 100%;
      transform-origin: left;
      transform-style: preserve-3d;
      transition: transform var(--transition-duration);
    }

    .page.flipped {
      transform: rotateY(-180deg);
    }

    .page > div {
      position: absolute;
      width: 100%;
      height: 100%;
      backface-visibility: hidden;
      display: flex;
      justify-content: center;
      align-items: center;
      font-size: 1.2em;
      background: var(--page-bg-color);
    }

    .front {
      background-color: #fdf6e3;
      overflow: hidden;
      & img {
        border-radius: 0 var(--page-border-radius) var(--page-border-radius) 0;
      }
    }

    .back {
      transform: rotateY(180deg);
      background-color: #eee;
      overflow: hidden;
      & img {
        border-radius: var(--page-border-radius) 0 0 var(--page-border-radius);
      }
    }

    #next,
    #prev {
      position: absolute;
      width: 50%;
      height: 100%;
      top: 0;
      bottom: 0;
    }

    #prev {
      left: -25%;
    }

    #next {
      right: 0;
    }

    button {
      padding: 10px 20px;
      margin: 0 10px;
      border: none;
      background-color: transparent;
      font-size: 16px;
      cursor: pointer;
      z-index: 10;
    }

    button:disabled {
      cursor: not-allowed;
    }

    img {
      max-width: 100%;
      max-height: 100%;
      object-fit: contain;
      border: 1px solid #ccc;
    }
  `;
B = He([
  Ce("zine-viewer")
], B);
export {
  B as ZineViewer
};