@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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/**
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 * Copyright 2017 Google LLC
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}
const F = C.litHtmlPolyfillSupport;
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    i._$litPart$ = n = new I(t.insertBefore(U(), o), o, void 0, e ?? {});
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  return n._$AI(s), n;
};
/**
 * @license
 * Copyright 2017 Google LLC
 * SPDX-License-Identifier: BSD-3-Clause
 */
let H = class extends w {
  constructor() {
    super(...arguments), this.renderOptions = { host: this }, this._$Do = void 0;
  }
  createRenderRoot() {
    var e;
    const t = super.createRenderRoot();
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  render() {
    return S;
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};
var dt;
H._$litElement$ = !0, H.finalized = !0, (dt = globalThis.litElementHydrateSupport) == null || dt.call(globalThis, { LitElement: H });
const W = globalThis.litElementPolyfillSupport;
W == null || W({ LitElement: H });
(globalThis.litElementVersions ?? (globalThis.litElementVersions = [])).push("4.1.1");
/**
 * @license
 * Copyright 2017 Google LLC
 * SPDX-License-Identifier: BSD-3-Clause
 */
const Nt = (s) => (t, e) => {
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    customElements.define(s, t);
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};
/**
 * @license
 * Copyright 2017 Google LLC
 * SPDX-License-Identifier: BSD-3-Clause
 */
const Tt = { attribute: !0, type: String, converter: T, reflect: !1, hasChanged: J }, Mt = (s = Tt, t, e) => {
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      t.call(this, l), this.requestUpdate(r, a, s);
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  throw Error("Unsupported decorator location: " + i);
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function v(s) {
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  })(s, t, e);
}
/**
 * @license
 * Copyright 2017 Google LLC
 * SPDX-License-Identifier: BSD-3-Clause
 */
function yt(s) {
  return v({ ...s, state: !0, attribute: !1 });
}
function at(s, t) {
  if (s)
    try {
      const e = JSON.parse(s);
      return Array.isArray(e) ? e.map(
        (i, n) => Array.isArray(i) ? { imgSrc: i[0], backImgSrc: i[1], index: n } : { imgSrc: i.img, backImgSrc: i.backImg, index: n }
      ) : V(t);
    } catch {
      return V(t);
    }
  return V(t);
}
function V(s) {
  return Array.from(s.children).map((t, e) => {
    const i = t.getAttribute("img-src"), n = t.getAttribute("back-img-src");
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}
function ht(s) {
  return { pageCount: s, currentPage: 0 };
}
function Lt(s, t) {
  return s < t.currentPage;
}
function P(s) {
  return s.currentPage < s.pageCount;
}
function N(s) {
  return s.currentPage > 0;
}
function Dt(s) {
  return P(s) ? {
    pageCount: s.pageCount,
    currentPage: s.currentPage + 1
  } : null;
}
function jt(s) {
  return N(s) ? {
    pageCount: s.pageCount,
    currentPage: s.currentPage - 1
  } : null;
}
function Ft(s, t) {
  const { pageCount: e, currentPage: i } = s, n = t !== "backward", o = [];
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    o.push(
      n ? Wt(e, i, r) : Vt(e, i, r)
    );
  return o;
}
function Wt(s, t, e) {
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}
function Vt(s, t, e) {
  return e === s - 1 && t >= s - 1 ? s + 1 : e === t ? s : e < t ? e : s - e;
}
const lt = { pageWidth: 291, pageHeight: 450 }, qt = {
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  // half-sheet 5.5×8.5 in — same 11:17 ratio as letter-8up
  "letter-half": lt,
  a5: { pageWidth: 148, pageHeight: 210 },
  a6: { pageWidth: 105, pageHeight: 148 },
  square: { pageWidth: 300, pageHeight: 300 },
  "digest-6x9": { pageWidth: 240, pageHeight: 360 }
};
function Zt(s) {
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}
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    (r = s[o]) && (n = (i ? r(t, e, n) : r(n)) || n);
  return i && n && Jt(t, e, n), n;
};
let f = class extends H {
  constructor() {
    super(...arguments), this.pagesAttr = "", this.keyboardNavigation = !0, this.keyboardNavigationFocusOnly = !1, this.autoplay = !1, this.autoplayInterval = 2e3, this.size = "", this.book = ht(0), this.stackDirection = "initial", this.prevButton = null, this.nextButton = null, this.keyboardHandler = null, this.autoplayIntervalId = null, this.isHovering = !1;
  }
  updateButtons() {
    !this.prevButton || !this.nextButton || (this.prevButton.disabled = !N(this.book), this.nextButton.disabled = !P(this.book));
  }
  startAutoplay() {
    this.stopAutoplay(), !(!this.autoplay || this.book.pageCount === 0 || this.isHovering) && (this.autoplayIntervalId = window.setInterval(() => {
      P(this.book) ? this.flipPageForwardInternal() : this.stopAutoplay();
    }, this.autoplayInterval));
  }
  stopAutoplay() {
    this.autoplayIntervalId !== null && (window.clearInterval(this.autoplayIntervalId), this.autoplayIntervalId = null);
  }
  flipPageForwardInternal() {
    const s = Dt(this.book);
    s && (this.book = s, this.stackDirection = "forward", this.updateButtons());
  }
  flipPageForward() {
    P(this.book) && (this.stopAutoplay(), this.flipPageForwardInternal(), this.autoplay && this.startAutoplay());
  }
  flipPageBackward() {
    if (!N(this.book)) return;
    this.stopAutoplay();
    const s = jt(this.book);
    s && (this.book = s, this.stackDirection = "backward", this.updateButtons(), this.autoplay && this.startAutoplay());
  }
  resizeContainer() {
    var h, p;
    const s = (h = this.shadowRoot) == null ? void 0 : h.querySelector(
      ".container"
    ), t = (p = this.shadowRoot) == null ? void 0 : p.querySelector(".wrapper");
    if (!s || !t) return;
    const e = parseInt(
      getComputedStyle(this).getPropertyValue("--canvas-padding")
    ), i = parseInt(
      getComputedStyle(this).getPropertyValue("--page-width")
    ), n = parseInt(
      getComputedStyle(this).getPropertyValue("--page-height")
    ), o = i * 2, r = t.clientWidth - e * 2, l = t.clientHeight - e * 2, a = r / o, d = l / n, u = Math.min(a, d);
    s.style.width = `${o * u}px`, s.style.height = `${n * u}px`;
  }
  syncSizePresetCss() {
    const s = Zt(this.size);
    s === null ? (this.style.removeProperty("--page-width"), this.style.removeProperty("--page-height")) : (this.style.setProperty("--page-width", `${s.pageWidth}px`), this.style.setProperty("--page-height", `${s.pageHeight}px`));
  }
  firstUpdated() {
    var o, r, l, a, d, u;
    this.syncSizePresetCss(), this.prevButton = (o = this.shadowRoot) == null ? void 0 : o.getElementById(
      "prev"
    ), this.nextButton = (r = this.shadowRoot) == null ? void 0 : r.getElementById(
      "next"
    ), this.resizeContainer(), new ResizeObserver(() => {
      this.resizeContainer();
    }).observe(this), (l = this.prevButton) == null || l.addEventListener("click", () => this.flipPageBackward()), (a = this.nextButton) == null || a.addEventListener("click", () => this.flipPageForward()), this.keyboardHandler = (h) => {
      this.keyboardNavigation && (this.keyboardNavigationFocusOnly && !this.matches(":focus-within") || (h.key === "ArrowLeft" ? (h.preventDefault(), this.flipPageBackward()) : h.key === "ArrowRight" && (h.preventDefault(), this.flipPageForward())));
    }, window.addEventListener("keydown", this.keyboardHandler);
    const t = (d = this.shadowRoot) == null ? void 0 : d.querySelector(".wrapper");
    t && (t.addEventListener("mouseenter", () => {
      this.isHovering = !0, this.stopAutoplay();
    }), t.addEventListener("mouseleave", () => {
      this.isHovering = !1, this.autoplay && this.startAutoplay();
    }));
    const e = Array.from(
      ((u = this.shadowRoot) == null ? void 0 : u.querySelectorAll("img")) || []
    );
    let i = 0;
    const n = e.length;
    n > 0 && (e.forEach((h) => {
      h.complete ? i++ : (h.addEventListener("load", () => {
        i++, i === n && this.updateButtons();
      }), h.addEventListener("error", () => {
        i++, i === n && this.updateButtons();
      }));
    }), i === n && this.updateButtons()), this.updateButtons(), this.autoplay && this.startAutoplay();
  }
  willUpdate(s) {
    super.willUpdate(s), s.has("size") && this.syncSizePresetCss();
    const e = at(this.pagesAttr, this).length;
    (s.has("pagesAttr") || e !== this.book.pageCount) && (this.book = ht(e), this.stackDirection = "initial");
  }
  updated(s) {
    var t, e;
    (!this.prevButton || !this.nextButton) && (this.prevButton = (t = this.shadowRoot) == null ? void 0 : t.getElementById(
      "prev"
    ), this.nextButton = (e = this.shadowRoot) == null ? void 0 : e.getElementById(
      "next"
    )), this.prevButton && this.nextButton && this.book.pageCount > 0 && this.updateButtons(), (s.has("autoplay") || s.has("autoplayInterval")) && (this.autoplay ? this.startAutoplay() : this.stopAutoplay()), s.has("size") && this.resizeContainer();
  }
  disconnectedCallback() {
    super.disconnectedCallback(), this.keyboardHandler && window.removeEventListener("keydown", this.keyboardHandler), this.stopAutoplay();
  }
  render() {
    const s = at(this.pagesAttr, this), t = Ft(this.book, this.stackDirection);
    return rt`
      <div
        class="wrapper"
        tabindex=${this.keyboardNavigationFocusOnly ? "0" : null}
      >
        <div class="container">
          <div class="zine">
            ${s.map(
      (e) => rt`<div
                  class="page${Lt(e.index, this.book) ? " flipped" : ""}"
                  data-page="${e.index + 1}"
                  style="z-index: ${t[e.index] ?? 0}"
                >
                  <div class="front"><img src="${e.imgSrc}" /></div>
                  <div class="back"><img src="${e.backImgSrc}" /></div>
                </div>`
    )}
            <button id="prev" ?disabled=${!N(this.book)}></button>
            <button id="next" ?disabled=${!P(this.book)}></button>
          </div>
        </div>
      </div>
    `;
  }
};
f.styles = mt`
    :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: 0;
      right: 50%;
    }

    #next {
      left: 50%;
    }

    button {
      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;
    }
  `;
g([
  v({ type: String, attribute: "pages" })
], f.prototype, "pagesAttr", 2);
g([
  v({ type: Boolean, attribute: "keyboard-navigation" })
], f.prototype, "keyboardNavigation", 2);
g([
  v({ type: Boolean, attribute: "keyboard-navigation-focus-only" })
], f.prototype, "keyboardNavigationFocusOnly", 2);
g([
  v({ type: Boolean, attribute: "autoplay" })
], f.prototype, "autoplay", 2);
g([
  v({ type: Number, attribute: "autoplay-interval" })
], f.prototype, "autoplayInterval", 2);
g([
  v({ type: String, attribute: "size" })
], f.prototype, "size", 2);
g([
  yt()
], f.prototype, "book", 2);
g([
  yt()
], f.prototype, "stackDirection", 2);
f = g([
  Nt("zine-viewer")
], f);
export {
  f as ZineViewer
};