Position Mapping

class EditorView {
  /**
   * Returns the viewport rectangle at a given document position.
   * `left` and `right` will be the same number, as this returns a
   * flat cursor-ish rectangle. If the position is between two things
   * that aren't directly adjacent, `side` determines which element
   * is used. When < 0, the element before the position is used,
   * otherwise the element after.
   */
  coordsAtPos(
    pos: number, 
    side?: number
  ): {left: number, right: number, top: number, bottom: number};
}

import { EditorView } from "prosemirror-view";

// Get coordinates at document position
const coords = view.coordsAtPos(15);
console.log(`Position 15 is at: ${coords.left}px, ${coords.top}px`);

// Get coordinates with side preference
const coordsBefore = view.coordsAtPos(15, -1); // Prefer element before
const coordsAfter = view.coordsAtPos(15, 1);   // Prefer element after

// Position a tooltip at a specific document position
function showTooltipAtPosition(view, pos, content) {
  const coords = view.coordsAtPos(pos);
  const tooltip = document.createElement("div");
  tooltip.className = "tooltip";
  tooltip.textContent = content;
  tooltip.style.position = "absolute";
  tooltip.style.left = coords.left + "px";
  tooltip.style.top = (coords.top - 30) + "px";
  document.body.appendChild(tooltip);
}

class EditorView {
  /**
   * Given a pair of viewport coordinates, return the document
   * position that corresponds to them. May return null if the given
   * coordinates aren't inside of the editor. When an object is
   * returned, its `pos` property is the position nearest to the
   * coordinates, and its `inside` property holds the position of the
   * inner node that the position falls inside of, or -1 if it is at
   * the top level, not in any node.
   */
  posAtCoords(coords: {left: number, top: number}): {
    pos: number, 
    inside: number
  } | null;
}

// Handle mouse click to get document position
view.dom.addEventListener("click", (event) => {
  const result = view.posAtCoords({
    left: event.clientX,
    top: event.clientY
  });
  
  if (result) {
    console.log(`Clicked at document position: ${result.pos}`);
    console.log(`Inside node at position: ${result.inside}`);
    
    // Create selection at click position
    const tr = view.state.tr.setSelection(
      TextSelection.create(view.state.doc, result.pos)
    );
    view.dispatch(tr);
  }
});

// Implement drag-to-select functionality
let isDragging = false;
let startPos = null;

view.dom.addEventListener("mousedown", (event) => {
  const result = view.posAtCoords({
    left: event.clientX,
    top: event.clientY
  });
  
  if (result) {
    isDragging = true;
    startPos = result.pos;
  }
});

view.dom.addEventListener("mousemove", (event) => {
  if (!isDragging || startPos === null) return;
  
  const result = view.posAtCoords({
    left: event.clientX,
    top: event.clientY
  });
  
  if (result) {
    const selection = TextSelection.create(
      view.state.doc, 
      Math.min(startPos, result.pos),
      Math.max(startPos, result.pos)
    );
    view.dispatch(view.state.tr.setSelection(selection));
  }
});

class EditorView {
  /**
   * Find the DOM position that corresponds to the given document
   * position. When `side` is negative, find the position as close as
   * possible to the content before the position. When positive,
   * prefer positions close to the content after the position. When
   * zero, prefer as shallow a position as possible.
   *
   * Note that you should **not** mutate the editor's internal DOM,
   * only inspect it.
   */
  domAtPos(pos: number, side?: number): {node: DOMNode, offset: number};
  
  /**
   * Find the document position that corresponds to a given DOM
   * position. The `bias` parameter can be used to influence which
   * side of a DOM node to use when the position is inside a leaf node.
   */
  posAtDOM(node: DOMNode, offset: number, bias?: number): number;
}

// Get DOM position for document position
const domPos = view.domAtPos(20);
console.log("DOM node:", domPos.node);
console.log("Offset within node:", domPos.offset);

// Create a DOM range at document position
function createRangeAtPosition(view, pos, length) {
  const startDOM = view.domAtPos(pos);
  const endDOM = view.domAtPos(pos + length);
  
  const range = document.createRange();
  range.setStart(startDOM.node, startDOM.offset);
  range.setEnd(endDOM.node, endDOM.offset);
  
  return range;
}

// Convert DOM selection to document position
function getDOMSelectionPos(view) {
  const selection = window.getSelection();
  if (!selection.rangeCount) return null;
  
  const range = selection.getRangeAt(0);
  const startPos = view.posAtDOM(range.startContainer, range.startOffset);
  const endPos = view.posAtDOM(range.endContainer, range.endOffset);
  
  return { from: startPos, to: endPos };
}

// Handle paste at specific DOM position
view.dom.addEventListener("paste", (event) => {
  const selection = window.getSelection();
  if (!selection.rangeCount) return;
  
  const range = selection.getRangeAt(0);
  const pos = view.posAtDOM(range.startContainer, range.startOffset);
  
  // Handle paste at document position `pos`
  const clipboardData = event.clipboardData.getData("text/plain");
  const tr = view.state.tr.insertText(clipboardData, pos);
  view.dispatch(tr);
  
  event.preventDefault();
});

class EditorView {
  /**
   * Find the DOM node that represents the document node after the
   * given position. May return `null` when the position doesn't point
   * in front of a node or if the node is inside an opaque node view.
   *
   * This is intended to be able to call things like
   * `getBoundingClientRect` on that DOM node. Do **not** mutate the
   * editor DOM directly, or add styling this way, since that will be
   * immediately overridden by the editor as it redraws the node.
   */
  nodeDOM(pos: number): DOMNode | null;
}

// Get DOM node at position for measurement
const nodeDOM = view.nodeDOM(25);
if (nodeDOM) {
  const rect = nodeDOM.getBoundingClientRect();
  console.log("Node dimensions:", rect.width, "x", rect.height);
  
  // Check if node is visible in viewport
  const isVisible = rect.top >= 0 && 
                   rect.left >= 0 && 
                   rect.bottom <= window.innerHeight && 
                   rect.right <= window.innerWidth;
  
  console.log("Node is visible:", isVisible);
}

// Highlight a specific node temporarily
function highlightNodeAtPosition(view, pos, duration = 2000) {
  const nodeDOM = view.nodeDOM(pos);
  if (!nodeDOM) return;
  
  const originalStyle = nodeDOM.style.cssText;
  nodeDOM.style.outline = "2px solid #007acc";
  nodeDOM.style.outlineOffset = "2px";
  
  setTimeout(() => {
    nodeDOM.style.cssText = originalStyle;
  }, duration);
}

class EditorView {
  /**
   * Find out whether the selection is at the end of a textblock when
   * moving in a given direction. When, for example, given `"left"`,
   * it will return true if moving left from the current cursor
   * position would leave that position's parent textblock. Will apply
   * to the view's current state by default, but it is possible to
   * pass a different state.
   */
  endOfTextblock(
    dir: "up" | "down" | "left" | "right" | "forward" | "backward", 
    state?: EditorState
  ): boolean;
}

// Check if at text block boundaries
const atLeftEdge = view.endOfTextblock("left");
const atRightEdge = view.endOfTextblock("right");
const atTopEdge = view.endOfTextblock("up");
const atBottomEdge = view.endOfTextblock("down");

console.log("At text block edges:", {
  left: atLeftEdge,
  right: atRightEdge,
  top: atTopEdge,
  bottom: atBottomEdge
});

// Custom key handler using textblock detection
function handleArrowKey(view, event) {
  const { key } = event;
  
  if (key === "ArrowLeft" && view.endOfTextblock("left")) {
    // At left edge of text block - custom behavior
    console.log("At left edge of text block");
    
    // Maybe jump to previous block or show navigation
    const selection = view.state.selection;
    const $pos = selection.$from;
    const prevBlock = $pos.nodeBefore;
    
    if (prevBlock) {
      const newPos = $pos.pos - prevBlock.nodeSize;
      const newSelection = TextSelection.create(view.state.doc, newPos);
      view.dispatch(view.state.tr.setSelection(newSelection));
      event.preventDefault();
    }
  }
  
  // Similar handling for other directions...
}

view.dom.addEventListener("keydown", (event) => {
  if (event.key.startsWith("Arrow")) {
    handleArrowKey(view, event);
  }
});

import { EditorView } from "prosemirror-view";
import { EditorState, TextSelection } from "prosemirror-state";

class PositionTracker {
  constructor(view) {
    this.view = view;
    this.tooltip = this.createTooltip();
    this.setupEventListeners();
  }
  
  createTooltip() {
    const tooltip = document.createElement("div");
    tooltip.className = "position-tooltip";
    tooltip.style.cssText = `
      position: absolute;
      background: #333;
      color: white;
      padding: 4px 8px;
      border-radius: 4px;
      font-size: 12px;
      pointer-events: none;
      z-index: 1000;
      display: none;
    `;
    document.body.appendChild(tooltip);
    return tooltip;
  }
  
  setupEventListeners() {
    // Track mouse position and show document position
    this.view.dom.addEventListener("mousemove", (event) => {
      const result = this.view.posAtCoords({
        left: event.clientX,
        top: event.clientY
      });
      
      if (result) {
        this.tooltip.textContent = `Pos: ${result.pos}, Inside: ${result.inside}`;
        this.tooltip.style.left = (event.clientX + 10) + "px";
        this.tooltip.style.top = (event.clientY - 30) + "px";
        this.tooltip.style.display = "block";
      } else {
        this.tooltip.style.display = "none";
      }
    });
    
    this.view.dom.addEventListener("mouseleave", () => {
      this.tooltip.style.display = "none";
    });
    
    // Track selection changes
    this.view.dom.addEventListener("selectionchange", () => {
      this.logSelectionInfo();
    });
  }
  
  logSelectionInfo() {
    const selection = this.view.state.selection;
    console.log("Selection changed:");
    console.log(`From: ${selection.from}, To: ${selection.to}`);
    
    // Get coordinates of selection endpoints
    const fromCoords = this.view.coordsAtPos(selection.from);
    const toCoords = this.view.coordsAtPos(selection.to);
    
    console.log("From coordinates:", fromCoords);
    console.log("To coordinates:", toCoords);
    
    // Check text block boundaries
    const boundaries = {
      left: this.view.endOfTextblock("left"),
      right: this.view.endOfTextblock("right"),
      up: this.view.endOfTextblock("up"),
      down: this.view.endOfTextblock("down")
    };
    
    console.log("At text block boundaries:", boundaries);
  }
  
  // Utility method to scroll to a document position
  scrollToPosition(pos) {
    const coords = this.view.coordsAtPos(pos);
    window.scrollTo({
      left: coords.left - window.innerWidth / 2,
      top: coords.top - window.innerHeight / 2,
      behavior: "smooth"
    });
  }
  
  // Create a visual indicator at a document position
  showIndicatorAtPosition(pos, text = "•", duration = 3000) {
    const coords = this.view.coordsAtPos(pos);
    const indicator = document.createElement("div");
    
    indicator.textContent = text;
    indicator.style.cssText = `
      position: absolute;
      left: ${coords.left}px;
      top: ${coords.top}px;
      color: red;
      font-weight: bold;
      font-size: 16px;
      pointer-events: none;
      z-index: 1000;
      animation: pulse 1s infinite;
    `;
    
    document.body.appendChild(indicator);
    
    setTimeout(() => {
      document.body.removeChild(indicator);
    }, duration);
  }
  
  destroy() {
    if (this.tooltip.parentNode) {
      this.tooltip.parentNode.removeChild(this.tooltip);
    }
  }
}

// Usage
const view = new EditorView(document.querySelector("#editor"), {
  state: myEditorState
});

const tracker = new PositionTracker(view);

// Example usage of position mapping
tracker.showIndicatorAtPosition(50, "📍");
tracker.scrollToPosition(100);