GM_Gallery のソースコード

GM_Gallery

图片列表转换为画廊
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(function () {
  function addStyle(style) {
    const $style = document.createElement("style");
    document.head.appendChild($style);
    $style.innerHTML = style;
  }

  class GM_Gallery {
    #storageKey = "gallery_mode";
    #gallery_mode = false;
    #srcList;

    constructor({ parser }) {
      this.#gallery_mode = localStorage.getItem(this.#storageKey) === "on";

      if (this.#gallery_mode) {
        this.#srcList = parser();
        this.#initHead();
        this.#initBody();
        this.#initProgress();
        this.#initPreview();
        this.#initStyle();
      }

      this.#initSwitch();
    }

    #initHead() {
      // head只保留title，保存页面时不会下载一堆乱七八糟的css和js
      document.head.innerHTML = `<title>${document.title}</title>`;
    }

    #initBody() {
      document.body.innerHTML = `
        <div id="gallery">
          ${this.#srcList
            .map((src, index) => {
              return `
                <span class="item" data-index="${index}">
                  <img src="${src}" onload="window.onImgLoaded()">
                  <div style="text-align: center;">${index + 1}</div>
                </span>
              `;
            })
            .join("")}
        </div>
        <div id="progress">0/${this.#srcList.length}</div>
      `;

      document.documentElement.scrollTop = 0;
    }

    #initProgress() {
      const $progress = document.querySelector("#progress");
      let loaded = 0;

      document.querySelectorAll("#gallery img").forEach(($img) => {
        $img.onload = () => {
          $progress.innerHTML = `${++loaded} / ${this.#srcList.length}`;
        };
      });
    }

    #initPreview() {
      const preview = new window.GM_Preview({
        showThumbs: false,
        onShow() {
          document.documentElement.classList.add("is-preview");
        },
        onClose() {
          document.documentElement.classList.remove("is-preview");
        },
      });

      document.querySelector("#gallery").onclick = (e) => {
        if (e.target.dataset.index) {
          const index = parseInt(e.target.dataset.index);
          preview.show(this.#srcList, index);
        }
      };
    }

    #initSwitch() {
      const $switch = document.createElement("div");
      document.body.appendChild($switch);
      $switch.textContent = `画廊模式：${this.#gallery_mode ? "开" : "关"}`;
      $switch.id = `gallery_mode_switch`;
      $switch.onclick = () => {
        if (this.#gallery_mode) localStorage.removeItem(this.#storageKey);
        else localStorage.setItem(this.#storageKey, "on");
        location.reload();
      };

      addStyle(`
        #gallery_mode_switch {
          z-index: 1000;
          position: fixed;
          right: 10px;
          top: 10px;
          border-radius: 4px;
          padding: 4px 8px;
          cursor: pointer;
          background-color: rgba(0, 0, 0, 0.8);
          color: #fff;
          font-size: 16px;
          user-select: none;
          opacity: 0.5;
          transition: all 0.3s;

          &:hover {
            opacity: 1;
          }
        }
      `);
    }

    #initStyle() {
      addStyle(`
        * {
          user-select: none;
          -webkit-user-drag: none;
        }

        #gallery {
          display: flex;
          flex-flow: row wrap;
          gap: 10px;
          padding: 50px 0;

          & .item {
            align-self: flex-end;
            cursor: pointer;

            & * {
              pointer-events: none;
            }

            & img {
              width: 100px;
              min-width: 100px;
              min-height: 100px;
              object-fit: contain;
              background-color: #ccc;
              transition: all 0.1s;
              border: 0.5px solid #ccc;
            }

            &:hover img {
              opacity: 0.5;
            }
          }
        }

        #progress {
          position: fixed;
          left: 10px;
          bottom: 10px;
          background-color: rgba(0, 0, 0, 0.8);
          color: #fff;
          border-radius: 4px;
          padding: 4px 8px;
          font-size: 16px;
          opacity: 0.5;
          pointer-events: none;
        }

        html.is-preview {
          overflow: hidden;

          & :is(#progress, #gallery_mode_switch) {
            display: none;
          }
        }
      `);
    }
  }

  window.GM_Gallery = GM_Gallery;
})();