From 922ecdf98f4f94b9d4c7bc2879d842c4621e48dc Mon Sep 17 00:00:00 2001
From: fantasticit <fantasticit@163.com>
Date: Sun, 18 Dec 2022 12:25:20 +0800
Subject: [PATCH] add scroll to cursor

---
 .../core/extensions/scroll-to-cursor.ts       | 127 ++++++
 .../src/tiptap/editor/collaboration/kit.ts    |   2 +
 packages/client/src/tiptap/image-load.js      | 374 ++++++++++++++++++
 3 files changed, 503 insertions(+)
 create mode 100644 packages/client/src/tiptap/core/extensions/scroll-to-cursor.ts
 create mode 100644 packages/client/src/tiptap/image-load.js

diff --git a/packages/client/src/tiptap/core/extensions/scroll-to-cursor.ts b/packages/client/src/tiptap/core/extensions/scroll-to-cursor.ts
new file mode 100644
index 0000000..9eaa7cb
--- /dev/null
+++ b/packages/client/src/tiptap/core/extensions/scroll-to-cursor.ts
@@ -0,0 +1,127 @@
+import { Extension } from '@tiptap/core';
+import { Plugin } from 'prosemirror-state';
+import { ImagesLoaded } from 'tiptap/image-load';
+
+/**
+ * Options for customizing Scroll2Cursor plugin
+ */
+export type Scroll2CursorOptions = {
+  /**
+   * The HTML element that wraps around the editor on which you would
+   * call `scrollTo` to scroll to the cursor. Default to `window`.
+   */
+  scrollerElement?: HTMLElement;
+  /**
+   * Number of milliseconds to wait before starting scrolling. The main reason
+   * for the delay is that it helps prevent flickering when the user hold down
+   * the up/down key. Default to 50.
+   */
+  delay?: number;
+  /**
+   * Used to override the default function in case there is another
+   * platform-specific implementation.
+   */
+  computeScrollTop?: () => number;
+  /**
+   * Number of pixels from the bottom where cursor position should be
+   * considered too low. Default to 64.
+   */
+  offsetBottom?: number;
+  /**
+   * Number of pixels from the top where cursor position should be considered
+   * too high. Default to 168.
+   */
+  offsetTop?: number;
+  /**
+   * Number of pixels you want to scroll downward/upward when the cursor is
+   * too low/high the. Default to 96.
+   */
+  scrollDistance?: number;
+  /**
+   * When debugMode is false or not set, the plugin will not print anything to
+   * the console.
+   */
+  debugMode?: boolean;
+};
+
+export const Scroll2Cursor = Extension.create<Scroll2CursorOptions>({
+  name: 'scroll2Cursor',
+
+  addOptions() {
+    return {
+      delay: 100,
+      offsetTop: 64,
+      offsetBottom: 64,
+      scrollDistance: 96,
+    };
+  },
+
+  addProseMirrorPlugins() {
+    const { options, editor } = this;
+    let timeoutScroll: ReturnType<typeof setTimeout>;
+    const offsetBottom = options?.offsetBottom;
+    const offsetTop = options?.offsetTop;
+    const scrollDistance = options?.scrollDistance;
+
+    function scrollTo(x: number, y: number) {
+      const scrollerElement =
+        options?.scrollerElement ||
+        editor.view?.dom?.parentElement?.parentElement?.parentElement?.parentElement ||
+        window;
+      scrollerElement.scrollTo(x, y);
+    }
+
+    return [
+      new Plugin({
+        props: {
+          handleScrollToSelection(view) {
+            const scrollerElement = (options?.scrollerElement ||
+              editor.view?.dom?.parentElement?.parentElement?.parentElement?.parentElement ||
+              window) as HTMLElement;
+            const scrollerHeight = scrollerElement.getBoundingClientRect().height;
+
+            ImagesLoaded(scrollerElement, function () {
+              timeoutScroll && clearTimeout(timeoutScroll);
+
+              timeoutScroll = setTimeout(() => {
+                if (scrollerHeight <= offsetBottom + offsetTop + scrollDistance) {
+                  options?.debugMode && console.info('The window height is too small for the scrolling configurations');
+                  return false;
+                }
+
+                const top =
+                  view.coordsAtPos(view.state.selection.$head.pos).top -
+                  (scrollerElement?.getBoundingClientRect().top ?? 0);
+
+                const scrollTop = options?.computeScrollTop
+                  ? options.computeScrollTop()
+                  : scrollerElement?.scrollTop ??
+                    (window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop) ??
+                    -1;
+
+                if (scrollTop === -1) {
+                  options?.debugMode && console.error('The plugin could not determine scrollTop');
+                  return;
+                }
+
+                const offBottom = top + offsetBottom - scrollerHeight;
+
+                if (offBottom > 0) {
+                  scrollTo(0, scrollTop + offBottom + scrollDistance);
+                  return;
+                }
+
+                const offTop = top - offsetTop;
+                if (offTop < 0) {
+                  scrollTo(0, scrollTop + offTop - scrollDistance);
+                }
+              }, options.delay);
+            });
+
+            return true;
+          },
+        },
+      }),
+    ];
+  },
+});
diff --git a/packages/client/src/tiptap/editor/collaboration/kit.ts b/packages/client/src/tiptap/editor/collaboration/kit.ts
index 7181533..c3f2e83 100644
--- a/packages/client/src/tiptap/editor/collaboration/kit.ts
+++ b/packages/client/src/tiptap/editor/collaboration/kit.ts
@@ -48,6 +48,7 @@ import { Paragraph } from 'tiptap/core/extensions/paragraph';
 import { Paste } from 'tiptap/core/extensions/paste';
 import { Placeholder } from 'tiptap/core/extensions/placeholder';
 import { QuickInsert } from 'tiptap/core/extensions/quick-insert';
+import { Scroll2Cursor } from 'tiptap/core/extensions/scroll-to-cursor';
 import { SearchNReplace } from 'tiptap/core/extensions/search';
 import { Status } from 'tiptap/core/extensions/status';
 import { Strike } from 'tiptap/core/extensions/strike';
@@ -186,4 +187,5 @@ export const CollaborationKit = [
   Title,
   DocumentWithTitle,
   Dragable,
+  Scroll2Cursor,
 ];
diff --git a/packages/client/src/tiptap/image-load.js b/packages/client/src/tiptap/image-load.js
new file mode 100644
index 0000000..b0e8d0d
--- /dev/null
+++ b/packages/client/src/tiptap/image-load.js
@@ -0,0 +1,374 @@
+/*!
+ * imagesLoaded v5.0.0
+ * JavaScript is all like "You images are done yet or what?"
+ * MIT License
+ */
+function EvEmitter() {}
+
+let proto = EvEmitter.prototype;
+
+proto.on = function (eventName, listener) {
+  if (!eventName || !listener) return this;
+
+  // set events hash
+  let events = (this._events = this._events || {});
+  // set listeners array
+  let listeners = (events[eventName] = events[eventName] || []);
+  // only add once
+  if (!listeners.includes(listener)) {
+    listeners.push(listener);
+  }
+
+  return this;
+};
+
+proto.once = function (eventName, listener) {
+  if (!eventName || !listener) return this;
+
+  // add event
+  this.on(eventName, listener);
+  // set once flag
+  // set onceEvents hash
+  let onceEvents = (this._onceEvents = this._onceEvents || {});
+  // set onceListeners object
+  let onceListeners = (onceEvents[eventName] = onceEvents[eventName] || {});
+  // set flag
+  onceListeners[listener] = true;
+
+  return this;
+};
+
+proto.off = function (eventName, listener) {
+  let listeners = this._events && this._events[eventName];
+  if (!listeners || !listeners.length) return this;
+
+  let index = listeners.indexOf(listener);
+  if (index != -1) {
+    listeners.splice(index, 1);
+  }
+
+  return this;
+};
+
+proto.emitEvent = function (eventName, args) {
+  let listeners = this._events && this._events[eventName];
+  if (!listeners || !listeners.length) return this;
+
+  // copy over to avoid interference if .off() in listener
+  listeners = listeners.slice(0);
+  args = args || [];
+  // once stuff
+  let onceListeners = this._onceEvents && this._onceEvents[eventName];
+
+  for (let listener of listeners) {
+    let isOnce = onceListeners && onceListeners[listener];
+    if (isOnce) {
+      // remove listener
+      // remove before trigger to prevent recursion
+      this.off(eventName, listener);
+      // unset once flag
+      delete onceListeners[listener];
+    }
+    // trigger listener
+    listener.apply(this, args);
+  }
+
+  return this;
+};
+
+proto.allOff = function () {
+  delete this._events;
+  delete this._onceEvents;
+  return this;
+};
+
+let console = () => {};
+
+// -------------------------- helpers -------------------------- //
+
+// turn element or nodeList into an array
+function makeArray(obj) {
+  // use object if already an array
+  if (Array.isArray(obj)) return obj;
+
+  let isArrayLike = typeof obj == 'object' && typeof obj.length == 'number';
+  // convert nodeList to array
+  if (isArrayLike) return [...obj];
+
+  // array of single index
+  return [obj];
+}
+
+// -------------------------- imagesLoaded -------------------------- //
+
+/**
+ * @param elem
+ * @param options - if function, use as callback
+ * @param onAlways - callback function
+ * @returns {ImagesLoaded}
+ */
+export function ImagesLoaded(elem, options, onAlways = null) {
+  // coerce ImagesLoaded() without new, to be new ImagesLoaded()
+  if (!(this instanceof ImagesLoaded)) {
+    return new ImagesLoaded(elem, options, onAlways);
+  }
+  // use elem as selector string
+  let queryElem = elem;
+  if (typeof elem == 'string') {
+    queryElem = document.querySelectorAll(elem);
+  }
+  // bail if bad element
+  if (!queryElem) {
+    console.error(`Bad element for imagesLoaded ${queryElem || elem}`);
+    return;
+  }
+
+  this.elements = makeArray(queryElem);
+  this.options = {};
+  // shift arguments if no options set
+  if (typeof options == 'function') {
+    onAlways = options;
+  } else {
+    Object.assign(this.options, options);
+  }
+
+  if (onAlways) this.on('always', onAlways);
+
+  this.getImages();
+
+  // HACK check async to allow time to bind listeners
+  setTimeout(this.check.bind(this));
+}
+
+ImagesLoaded.prototype = Object.create(EvEmitter.prototype);
+
+ImagesLoaded.prototype.getImages = function () {
+  this.images = [];
+
+  // filter & find items if we have an item selector
+  this.elements.forEach(this.addElementImages, this);
+};
+
+const elementNodeTypes = [1, 9, 11];
+
+/**
+ * @param {Node} elem
+ */
+ImagesLoaded.prototype.addElementImages = function (elem) {
+  // filter siblings
+  if (elem.nodeName === 'IMG') {
+    this.addImage(elem);
+  }
+  // get background image on element
+  if (this.options.background === true) {
+    this.addElementBackgroundImages(elem);
+  }
+
+  // find children
+  // no non-element nodes, #143
+  let { nodeType } = elem;
+  if (!nodeType || !elementNodeTypes.includes(nodeType)) return;
+
+  let childImgs = elem.querySelectorAll('img');
+  // concat childElems to filterFound array
+  for (let img of childImgs) {
+    this.addImage(img);
+  }
+
+  // get child background images
+  if (typeof this.options.background == 'string') {
+    let children = elem.querySelectorAll(this.options.background);
+    for (let child of children) {
+      this.addElementBackgroundImages(child);
+    }
+  }
+};
+
+const reURL = /url\((['"])?(.*?)\1\)/gi;
+
+ImagesLoaded.prototype.addElementBackgroundImages = function (elem) {
+  let style = getComputedStyle(elem);
+  // Firefox returns null if in a hidden iframe https://bugzil.la/548397
+  if (!style) return;
+
+  // get url inside url("...")
+  let matches = reURL.exec(style.backgroundImage);
+  while (matches !== null) {
+    let url = matches && matches[2];
+    if (url) {
+      this.addBackground(url, elem);
+    }
+    matches = reURL.exec(style.backgroundImage);
+  }
+};
+
+/**
+ * @param {Image} img
+ */
+ImagesLoaded.prototype.addImage = function (img) {
+  let loadingImage = new LoadingImage(img);
+  this.images.push(loadingImage);
+};
+
+ImagesLoaded.prototype.addBackground = function (url, elem) {
+  let background = new Background(url, elem);
+  this.images.push(background);
+};
+
+ImagesLoaded.prototype.check = function () {
+  this.progressedCount = 0;
+  this.hasAnyBroken = false;
+  // complete if no images
+  if (!this.images.length) {
+    this.complete();
+    return;
+  }
+
+  /* eslint-disable-next-line func-style */
+  let onProgress = (image, elem, message) => {
+    // HACK - Chrome triggers event before object properties have changed. #83
+    setTimeout(() => {
+      this.progress(image, elem, message);
+    });
+  };
+
+  this.images.forEach(function (loadingImage) {
+    loadingImage.once('progress', onProgress);
+    loadingImage.check();
+  });
+};
+
+ImagesLoaded.prototype.progress = function (image, elem, message) {
+  this.progressedCount++;
+  this.hasAnyBroken = this.hasAnyBroken || !image.isLoaded;
+  // progress event
+  this.emitEvent('progress', [this, image, elem]);
+  if (this.jqDeferred && this.jqDeferred.notify) {
+    this.jqDeferred.notify(this, image);
+  }
+  // check if completed
+  if (this.progressedCount === this.images.length) {
+    this.complete();
+  }
+
+  if (this.options.debug && console) {
+    console.log(`progress: ${message}`, image, elem);
+  }
+};
+
+ImagesLoaded.prototype.complete = function () {
+  let eventName = this.hasAnyBroken ? 'fail' : 'done';
+  this.isComplete = true;
+  this.emitEvent(eventName, [this]);
+  this.emitEvent('always', [this]);
+  if (this.jqDeferred) {
+    let jqMethod = this.hasAnyBroken ? 'reject' : 'resolve';
+    this.jqDeferred[jqMethod](this);
+  }
+};
+
+// --------------------------  -------------------------- //
+
+function LoadingImage(img) {
+  this.img = img;
+}
+
+LoadingImage.prototype = Object.create(EvEmitter.prototype);
+
+LoadingImage.prototype.check = function () {
+  // If complete is true and browser supports natural sizes,
+  // try to check for image status manually.
+  let isComplete = this.getIsImageComplete();
+  if (isComplete) {
+    // report based on naturalWidth
+    this.confirm(this.img.naturalWidth !== 0, 'naturalWidth');
+    return;
+  }
+
+  // If none of the checks above matched, simulate loading on detached element.
+  this.proxyImage = new Image();
+  // add crossOrigin attribute. #204
+  if (this.img.crossOrigin) {
+    this.proxyImage.crossOrigin = this.img.crossOrigin;
+  }
+  this.proxyImage.addEventListener('load', this);
+  this.proxyImage.addEventListener('error', this);
+  // bind to image as well for Firefox. #191
+  this.img.addEventListener('load', this);
+  this.img.addEventListener('error', this);
+  this.proxyImage.src = this.img.currentSrc || this.img.src;
+};
+
+LoadingImage.prototype.getIsImageComplete = function () {
+  // check for non-zero, non-undefined naturalWidth
+  // fixes Safari+InfiniteScroll+Masonry bug infinite-scroll#671
+  return this.img.complete && this.img.naturalWidth;
+};
+
+LoadingImage.prototype.confirm = function (isLoaded, message) {
+  this.isLoaded = isLoaded;
+  let { parentNode } = this.img;
+  // emit progress with parent <picture> or self <img>
+  let elem = parentNode.nodeName === 'PICTURE' ? parentNode : this.img;
+  this.emitEvent('progress', [this, elem, message]);
+};
+
+// ----- events ----- //
+
+// trigger specified handler for event type
+LoadingImage.prototype.handleEvent = function (event) {
+  let method = 'on' + event.type;
+  if (this[method]) {
+    this[method](event);
+  }
+};
+
+LoadingImage.prototype.onload = function () {
+  this.confirm(true, 'onload');
+  this.unbindEvents();
+};
+
+LoadingImage.prototype.onerror = function () {
+  this.confirm(false, 'onerror');
+  this.unbindEvents();
+};
+
+LoadingImage.prototype.unbindEvents = function () {
+  this.proxyImage.removeEventListener('load', this);
+  this.proxyImage.removeEventListener('error', this);
+  this.img.removeEventListener('load', this);
+  this.img.removeEventListener('error', this);
+};
+
+// -------------------------- Background -------------------------- //
+
+function Background(url, element) {
+  this.url = url;
+  this.element = element;
+  this.img = new Image();
+}
+
+// inherit LoadingImage prototype
+Background.prototype = Object.create(LoadingImage.prototype);
+
+Background.prototype.check = function () {
+  this.img.addEventListener('load', this);
+  this.img.addEventListener('error', this);
+  this.img.src = this.url;
+  // check if image is already complete
+  let isComplete = this.getIsImageComplete();
+  if (isComplete) {
+    this.confirm(this.img.naturalWidth !== 0, 'naturalWidth');
+    this.unbindEvents();
+  }
+};
+
+Background.prototype.unbindEvents = function () {
+  this.img.removeEventListener('load', this);
+  this.img.removeEventListener('error', this);
+};
+
+Background.prototype.confirm = function (isLoaded, message) {
+  this.isLoaded = isLoaded;
+  this.emitEvent('progress', [this, this.element, message]);
+};