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156
static/Vvvebjs/libs/builder/undo.js
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156
static/Vvvebjs/libs/builder/undo.js
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/*
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Copyright 2017 Ziadin Givan
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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https://github.com/givanz/VvvebJs
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*/
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/*
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https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver
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childList Set to true if additions and removals of the target node's child elements (including text nodes) are to be observed.
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attributes Set to true if mutations to target's attributes are to be observed.
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characterData Set to true if mutations to target's data are to be observed.
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subtree Set to true if mutations to target and target's descendants are to be observed.
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attributeOldValue Set to true if attributes is set to true and target's attribute value before the mutation needs to be recorded.
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characterDataOldValue Set to true if characterData is set to true and target's data before the mutation needs to be recorded.
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attributeFilter Set to an array of attribute local names (without namespace) if not all attribute mutations need to be observed.
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*/
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/*
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MutationRecord.type String Returns "attributes" if the mutation was an attribute mutation,
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"characterData" if it was a mutation to a CharacterData node,
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and "childList" if it was a mutation to the tree of nodes.
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MutationRecord.target Node Returns the node the mutation affected, depending on the MutationRecord.type.
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For attributes, it is the element whose attribute changed.
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For characterData, it is the CharacterData node.
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For childList, it is the node whose children changed.
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MutationRecord.addedNodes NodeList Return the nodes added. Will be an empty NodeList if no nodes were added.
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MutationRecord.removedNodes NodeList Return the nodes removed. Will be an empty NodeList if no nodes were removed.
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MutationRecord.previousSibling Node Return the previous sibling of the added or removed nodes, or null.
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MutationRecord.nextSibling Node Return the next sibling of the added or removed nodes, or null.
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MutationRecord.attributeName String Returns the local name of the changed attribute, or null.
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MutationRecord.attributeNamespace String Returns the namespace of the changed attribute, or null.
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MutationRecord.oldValue String The return value depends on the MutationRecord.type.
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For attributes, it is the value of the changed attribute before the change.
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For characterData, it is the data of the changed node before the change.
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For childList, it is null.
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*/
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Vvveb.Undo = {
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mutations: [],
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undoIndex: -1,
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enabled:true,
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/*
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init: function() {
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},
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*/
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addMutation : function(mutation) {
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/*
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this.mutations.push(mutation);
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this.undoIndex++;
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*/
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this.mutations.splice(++this.undoIndex, this.mutations.length - this.undoIndex, mutation);
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const event = new CustomEvent("vvveb.undo.add", {detail: mutation});
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Vvveb.Builder.frameBody.dispatchEvent(event);
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},
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restore : function(mutation, undo) {
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switch (mutation.type) {
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case 'childList':
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if (undo == true) {
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addedNodes = mutation.removedNodes;
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removedNodes = mutation.addedNodes;
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} else { //redo
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addedNodes = mutation.addedNodes;
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removedNodes = mutation.removedNodes;
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}
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if (addedNodes) for(i in addedNodes) {
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node = addedNodes[i];
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if (mutation.nextSibling) {
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mutation.nextSibling.parentNode.insertBefore(node, mutation.nextSibling);
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} else {
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mutation.target.append(node);
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}
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}
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if (removedNodes) for(i in removedNodes) {
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node = removedNodes[i];
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node.parentNode.removeChild(node);
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}
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break;
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case 'move':
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if (undo == true) {
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parent = mutation.oldParent;
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sibling = mutation.oldNextSibling;
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} else { //redo
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parent = mutation.newParent;
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sibling = mutation.newNextSibling;
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}
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if (sibling) {
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sibling.parentNode.insertBefore(mutation.target, sibling);
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} else {
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parent.append(node);
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}
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break;
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case 'characterData':
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mutation.target.innerHTML = undo ? mutation.oldValue : mutation.newValue;
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break;
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case 'style':
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window.FrameDocument.getElementById("vvvebjs-styles").textContent = ( undo ? mutation.oldValue : mutation.newValue );
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break;
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case 'attributes':
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value = undo ? mutation.oldValue : mutation.newValue;
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if (value || value === false || value === 0)
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mutation.target.setAttribute(mutation.attributeName, value);
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else
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mutation.target.removeAttribute(mutation.attributeName);
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break;
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}
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const event = new CustomEvent("vvveb.undo.restore", {detail: mutation});
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Vvveb.Builder.frameBody.dispatchEvent(event);
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},
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undo : function() {
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if (this.undoIndex >= 0) {
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this.restore(this.mutations[this.undoIndex--], true);
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}
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},
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redo : function() {
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if (this.undoIndex < this.mutations.length - 1) {
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this.restore(this.mutations[++this.undoIndex], false);
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}
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},
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hasChanges : function() {
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return this.mutations.length;
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},
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reset : function() {
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this.mutations = [];
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this.undoIndex = -1;
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}
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};
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