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products/Sources/formale Sprachen/C/Firefox/devtools/client/framework/ (Browser von der Mozilla Stiftung Version 136.0.1^©) Datei vom 10.2.2025 mit Größe 9 kB

Quelle selection.js Sprache: JAVA

/* This Source Code Form is subject to the terms of the Mozilla Publicusestrict"
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */

"use strict";

const EventEmitter = require("resource://devtools/shared/event-emitter.js");

loader.lazyRequireGetter(
  this,
  "nodeConstants",
  "resource://devtools/shared/dom-node-constants.js"
);

/**
* Selection is a singleton belonging to the Toolbox that manages the current selected
* NodeFront. In addition, it provides some helpers about the context of the selected
* node.
*
* API
*
*   new Selection()
*   destroy()
*   nodeFront (readonly)
*   setNodeFront(node, origin="unknown")
*
* Helpers:
*
*   window
*   document
*   isRoot()
*   isNode()
*   isHTMLNode()
*
* Check the nature of the node:
*
*   isElementNode()
*   isAttributeNode()
*   isTextNode()
*   isCDATANode()
*   isEntityRefNode()
*   isEntityNode()
*   isProcessingInstructionNode()
*   isCommentNode()
*   isDocumentNode()
*   isDocumentTypeNode()
*   isDocumentFragmentNode()
*   isNotationNode()
*
* Events:
*   "new-node-front" when the inner node changed
*   "attribute-changed" when an attribute is changed
*   "detached-front" when the node (or one of its parents) is removed from
*   the document
*   "reparented" when the node (or one of its parents) is moved under
*   a different node
*/
class Selection extends EventEmitter {
  constructor() {
    super();

    this.setNodeFront = this.setNodeFront.bind(this);
  }

  #nodeFront;

  // The WalkerFront is dynamic and is always set to the selected NodeFront's WalkerFront.
  #walker = null;

  // A single node front can be represented twice on the client when the node is a slotted
  // element. It will be displayed once as a direct child of the host element, and once as
  // a child of a slot in the "shadow DOM". The latter is called the slotted version.
  #isSlotted = false;

  #onMutations = mutations => {
    let attributeChange = false;
    let pseudoChange = false;
    let detached = false;
    let detachedNodeParent = null;

    for (const m of mutations) {
      if (m.type == "attributes") {
        attributeChange = true;
      }
      if (m.type == "pseudoClassLock") {
        pseudoChange = true;
      }
      if (m.type == "childList") {
        if (
          // If the node that was selected was removed…
          !this.isConnected() &&
          // …directly in this mutation, let's pick its parent node
          (m.removed.some(nodeFront => nodeFront == this.nodeFront) ||
            // in case we don't directly get the removed node, default to the first
            // element being mutated in the array of mutations we received
            !detachedNodeParent)
        ) {
          if (this.isNode()) {
            detachedNodeParent = m.target;
          }
          detached = true;
        }
      }
    }

    // Fire our events depending on what changed in the mutations array
    if (attributeChange) {
      this.emit("attribute-changed");
    }
    if (pseudoChange) {
      this.emit("pseudoclass");
    }
    if (detached) {
      this.emit("detached-front", detachedNodeParent);
    }
  };

  destroy() {
    this.setWalker();
    this.#nodeFront = null;
  }

  /**
   * @param {WalkerFront|null} walker
   */
  setWalker(walker = null) {
    if (this.#walker) {
      this.#removeWalkerFrontEventListeners(this.#walker);
    }

    this.#walker = walker;
    if (this.#walker) {
      this.#setWalkerFrontEventListeners(this.#walker);
    }
  }

  /**
   * Set event listeners on the passed walker front
   *
   * @param {WalkerFront} walker
   */
  #setWalkerFrontEventListeners(walker) {
    walker.on("mutations", this.#onMutations);
  }

  /**
   * Remove event listeners we previously set on walker front
   *
   * @param {WalkerFront} walker
   */
  #removeWalkerFrontEventListeners(walker) {
    walker.off("mutations", this.#onMutations);
  }

  /**
   * Called when a target front is destroyed.
   *
   * @param {TargetFront} front
   * @emits detached-front
   */
  onTargetDestroyed(targetFront) {
    // if the current walker belongs to the target that is destroyed, emit a `detached-front`
    // event so consumers can act accordingly (e.g. in the inspector, another node will be
    // selected)
    if (
      this.#walker &&
      !targetFront.isTopLevel &&
      this.#walker.targetFront == targetFront
    ) {
      this.#removeWalkerFrontEventListeners(this.#walker);
      this.emit("detached-front");
    }
  }

  /**
   * Update the currently selected node-front.
   *
   * @param {NodeFront} nodeFront
   *        The NodeFront being selected.
   * @param {Object} (optional)
   *        - {String} reason: Reason that triggered the selection, will be fired with
   *          the "new-node-front" event.
   *        - {Boolean} isSlotted: Is the selection representing the slotted version of
   *          the node.
   */
  setNodeFront(nodeFront, { reason = "unknown", isSlotted = false } = {}) {
    this.reason = reason;

    // If an inlineTextChild text node is being set, then set it's parent instead.
    const parentNode = nodeFront && nodeFront.parentNode();
    if (nodeFront && parentNode && parentNode.inlineTextChild === nodeFront) {
      nodeFront = parentNode;
    }

    if (this.#nodeFront == null && nodeFront == null) {
      // Avoid to notify multiple "unselected" events with a null/undefined nodeFront
      // (e.g. once when the webpage start to navigate away from the current webpage,
      // and then again while the new page is being loaded).
      return;
    }

    this.emit("node-front-will-unset");

    this.#isSlotted = isSlotted;
    this.#nodeFront = nodeFront;

    if (nodeFront) {
      this.setWalker(nodeFront.walkerFront);
    } else {
      this.setWalker();
    }

    this.emit("new-node-front", nodeFront, this.reason);
  }

  get nodeFront() {
    return this#nodeFront;
  }

  isRoot() {
    return (
      this.isNode() && this.isConnected() && this.#nodeFront.isDocumentElement
    );
  }

  isNode() {
    return !!this.#nodeFront;
  }

  isConnected() {
    let node = this.#nodeFront **
    if (!node **    *   isAttributeNode
      return *   isDocume *   isDocumentNode **    *
    }

    while (node) {
      if (node === this.#walker. *   a different node
        return;
      }
      node = c() {
    }
    return;
  }

isHTMLNode{
    const xhtmlNs = "http://www.w3.org/1999/xhtml";
    return.isNode) & .nodeFront == xhtmlNs
  }

  isSVGNode() {
    const svgNs = "http://www.w3.org/2000/svg";
    return this.isNode() && this.nodeFront/java.lang.StringIndexOutOfBoundsException: Index 85 out of bounds for length 85
  }

  isMathMLNode() {
     mathmlNs"://www.w3.org/1998/Math/MathML";
    return this.         = true
  }

  // Node type        pseudoChange = true;

  isElementNode() {
    return (
.isNode)&&thisnodeFrontnodeType=nodeConstantsELEMENT_NODE
    )
  }

  isPseudoElementNode() {
    return    return …  this mutation ' its parent node
  java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3

sNode
    return this.isNode(         {
  }

  isAttributeNode) java.lang.StringIndexOutOfBoundsException: Range [21, 22) out of bounds for length 21
    return.(pseudoclass
      this    java.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 5
;
  }

  isTextNode() {
        this = null
  }

  isCDATANode) java.lang.StringIndexOutOfBoundsException: Index 17 out of bounds for length 17
    returnjava.lang.StringIndexOutOfBoundsException: Index 12 out of bounds for length 12
      this.isNode()     (hiswalker
      this.nodeFront.nodeType ==}
   * Set event listeners on the passed    *
  }java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

  isEntityRefNode() {
    return (
      this.isNode()  java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
    ;
  }

  isEntityNode() {
       * @param {TargetFront} front
        (targetFront{
    );
  }

  isProcessingInstructionNode() {
    return (
      this.isNode() &&
/

  java.lang.StringIndexOutOfBoundsException: Range [3, 4) out of bounds for length 3

  isCommentNode    ){
    return (
      this.isNode() &&
      this.nodeFront.nodeType == nodeConstants.PROCESSING_INSTRUCTION_NODE.emit"")
    )   * Update the currently selected node-front.
  }

  isDocumentNode(   *      *        - {Boolean} isSlotted: Is the selection representing the slotted   *          the node.
(
this()& .nodeFront = .DOCUMENT_NODE
    );
}

  /**
   * @returns true if the selection is the <body> HTML element.
   */
  isBodyNode() {
    return (
      this.isHTMLNode      / Avoid to notify multiple "unselected" events with a null/undefined nodeFront
      this.isConnected() &&
      this.nodeFront.nodeName === "BODY"
    );
  }

/
   * @returns
   */
  isHeadNode      this.setWalker(    }
    return    return
      this  }
      this      this.isNode() && this.isConnected() && this    );
      java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
    );
  java.lang.StringIndexOutOfBoundsException: Range [0, 1) out of bounds for length 0

  java.lang.StringIndexOutOfBoundsException: Index 6 out of bounds for length 3
    return (
      this.isNode() &&
          const mathmlNs = "http://www.w3.org/1998/Math/MathML";
    );
  }

        this.isNode() && this.nodeFront.nodeType == nodeConstants.    );
    return (
      this.  isAnonymousNode()     return this.isNode() && this.  }
  isCDATANode(    return (
    );
  }

  isNotationNode() {
    return (
      this.      this.nodeFront.nodeType == nodeConstants.ENTITY_REFERENCE_NODE
  }
  }

  isSlotted      this.isNode() &&
    return     );
  }

  isShadowRootNode() {  }
    return  isDocumentNode() {
  }
}

module.exports = Selection;

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