[js] 在面包屑旁添加全屏按钮，快捷切换全屏

// 在面包屑旁添加全屏按钮，快捷切换全屏 JS片段
// author by JeffreyChen https://ld246.com/article/1731698559408

// 注意：需要为全屏切换设置一个快捷键

(function() {
  function addFullScreenButton(protyleElement) {
    // 检查该 protyle 是否已经有了 fullScreen_simulate 按钮
    if (protyleElement.querySelector('.fullScreen_simulate')) {
      return; // 如果已存在，直接返回
    }

    let mode = protyleElement.querySelector('.protyle-breadcrumb .block__icon[data-type="readonly"]');

    if (mode) {
      mode.insertAdjacentHTML(
        "beforebegin",
        '<button class="fullScreen_simulate block__icon fn__flex-center ariaLabel" aria-label="全屏切换"></button>'
      );

      let fullScreenBtn = protyleElement.querySelector(".fullScreen_simulate");
      fullScreenBtn.innerHTML = `<svg><use xlink:href="#iconFullscreen"></use></svg>`;

      fullScreenBtn.addEventListener("click", function (e) {
        // 获取 .layout-tab-container > .protyle .protyle-breadcrumb__space 元素
        const breadcrumbSpace = protyleElement.querySelector('.protyle-breadcrumb__space');
        // 如果元素存在，则模拟点击，聚焦当前页签
        if (breadcrumbSpace) {
          breadcrumbSpace.click();
        }

        dispatchKeyEvent();
  
        // 切换图标
        const iconUse = fullScreenBtn.querySelector('use');
        if (iconUse.getAttribute('xlink:href') === '#iconFullscreen') {
          iconUse.setAttribute('xlink:href', '#iconFullscreenExit');
        } else {
          iconUse.setAttribute('xlink:href', '#iconFullscreen');
        }
      });
    }
  }

  function dispatchKeyEvent() {
    let keyInit = parseHotKeyStr(window.top.siyuan.config.keymap.editor.general.fullscreen.custom);
    keyInit["bubbles"] = true;
    let keydownEvent = new KeyboardEvent('keydown', keyInit);
    document.getElementsByTagName("body")[0].dispatchEvent(keydownEvent);
    let keyUpEvent = new KeyboardEvent('keyup', keyInit);
    document.getElementsByTagName("body")[0].dispatchEvent(keyUpEvent);
  }

  /**
   * @param {*} hotkeyStr 思源hotkey格式 Refer: https://github.com/siyuan-note/siyuan/blob/d0f011b1a5b12e5546421f8bd442606bf0b5ad86/app/src/protyle/util/hotKey.ts#L4
   * @returns KeyboardEventInit Refer: https://developer.mozilla.org/zh-CN/docs/Web/API/KeyboardEvent/KeyboardEvent
   */
  function parseHotKeyStr(hotkeyStr) {
    let result = {
      ctrlKey: false,
      altKey: false,
      metaKey: false,
      shiftKey: false,
      key: 'A',
      keyCode: 0
    }
    if (hotkeyStr == "" || hotkeyStr == undefined || hotkeyStr == null) {
      console.error("解析快捷键设置失败", hotkeyStr);
      throw new Error("解析快捷键设置失败");
    }
    let onlyKey = hotkeyStr;
    if (hotkeyStr.indexOf("⌘") != -1) {
      result.ctrlKey = true;
      onlyKey = onlyKey.replace("⌘", "");
    }
    if (hotkeyStr.indexOf("⌥") != -1) {
      result.altKey = true;
      onlyKey = onlyKey.replace("⌥", "");
    }
    if (hotkeyStr.indexOf("⇧") != -1) {
      result.shiftKey = true;
      onlyKey = onlyKey.replace("⇧", "");
    }
    // 未处理 windows btn （MetaKey） 
    result.key = onlyKey;
    // 在https://github.com/siyuan-note/siyuan/commit/70acd57c4b4701b973a8ca93fadf6c003b24c789#diff-558f9f531a326d2fd53151e3fc250ac4bd545452ba782b0c7c18765a37a4e2cc
    // 更改中，思源改为使用keyCode判断快捷键按下事件，这里进行了对应的转换
    // 另请参考该提交中涉及的文件
    result.keyCode = keyCodeList[result.key];
    console.assert(result.keyCode != undefined, `keyCode转换错误,key为${result.key}`);
    switch (result.key) {
      case "→": {
        result.key = "ArrowRight";
        break;
      }
      case "←": {
        result.key = "ArrowLeft";
        break;
      }
      case "↑": {
        result.key = "ArrowUp";
        break;
      }
      case "↓": {
        result.key = "ArrowDown";
        break;
      }
      case "⌦": {
        result.key = "Delete";
        break;
      }
      case "⌫": {
        result.key = "Backspace";
        break;
      }
      case "↩": {
        result.key = "Enter";
        break;
      }
    }
    return result;
  }

  const keyCodeList = {
    "⌫": 8,
    "⇥": 9,
    "↩": 13,
    "⇧": 16,
    "⌘": 91,
    "⌥": 18,
    "Pause": 19,
    "CapsLock": 20,
    "Escape": 27,
    " ": 32,
    "PageUp": 33,
    "PageDown": 34,
    "End": 35,
    "Home": 36,
    "←": 37,
    "↑": 38,
    "→": 39,
    "↓": 40,
    "PrintScreen": 44,
    "Insert": 45,
    "⌦": 46,
    "0": 48,
    "1": 49,
    "2": 50,
    "3": 51,
    "4": 52,
    "5": 53,
    "6": 54,
    "7": 55,
    "8": 56,
    "9": 57,
    "A": 65,
    "B": 66,
    "C": 67,
    "D": 68,
    "E": 69,
    "F": 70,
    "G": 71,
    "H": 72,
    "I": 73,
    "J": 74,
    "K": 75,
    "L": 76,
    "M": 77,
    "N": 78,
    "O": 79,
    "P": 80,
    "Q": 81,
    "R": 82,
    "S": 83,
    "T": 84,
    "U": 85,
    "V": 86,
    "W": 87,
    "X": 88,
    "Y": 89,
    "Z": 90,
    "ContextMenu": 93,
    "MyComputer": 182,
    "MyCalculator": 183,
    ";": 186,
    "=": 187,
    ",": 188,
    "-": 189,
    ".": 190,
    "/": 191,
    "`": 192,
    "[": 219,
    "\\": 220,
    "]": 221,
    "'": 222,
    "*": 106,
    "+": 107,
    "-": 109,
    ".": 110,
    "/": 111,
    "F1": 112,
    "F2": 113,
    "F3": 114,
    "F4": 115,
    "F5": 116,
    "F6": 117,
    "F7": 118,
    "F8": 119,
    "F9": 120,
    "F10": 121,
    "F11": 122,
    "F12": 123,
    "NumLock": 144,
    "ScrollLock": 145
  };

  // 定期检查 .layout__center 是否存在于 DOM 中
  function checkForLayoutCenter() {
    const targetNode = document.querySelector('.layout__center');
    if (targetNode) {
      startObserving(targetNode);
      // 立即检查一次 protyle-breadcrumb
      checkProtyleElements(targetNode);
    } else {
      setTimeout(checkForLayoutCenter, 200);
    }
  }

  function checkProtyleElements(targetNode) {
    const protyles = targetNode.querySelectorAll('.layout-tab-container > .protyle');
    protyles.forEach(protyle => {
      addFullScreenButton(protyle);
    });
  }

  function startObserving(targetNode) {
    const observer = new MutationObserver((mutations) => {
      mutations.forEach(mutation => {
        if (mutation.type === 'childList') {
          mutation.addedNodes.forEach(node => {
            // 检查添加的节点是否是 .protyle 元素
            if (node.nodeType === 1 && node.matches('.layout-tab-container > .protyle')) {
              addFullScreenButton(node);
            }
          });
        } else if (mutation.type === 'attributes' && mutation.target.matches('.layout-tab-container > .protyle')) {
          // 如果已有的 protyle 的类名发生变化，尝试添加全屏按钮
          addFullScreenButton(mutation.target);
        }
      });
    });

    // 配置并开始观察
    const config = { childList: true, subtree: true, attributes: true };
    observer.observe(targetNode, config);
  }

  checkForLayoutCenter();
})();