Editors: Added lexical editor for testing

Started basic playground for testing lexical as a new WYSIWYG editor.
Moved out tinymce to be under wysiwyg-tinymce instead so lexical is the
default, but TinyMce code remains.

resources/js/wysiwyg-tinymce/plugins-tasklist.js

@@ -0,0 +1,173 @@
+/**
+ * @param {Element} element
+ * @return {boolean}
+ */
+function elementWithinTaskList(element) {
+    const listEl = element.closest('li');
+    return listEl && listEl.parentNode.nodeName === 'UL' && listEl.classList.contains('task-list-item');
+}
+
+/**
+ * @param {MouseEvent} event
+ * @param {Element} clickedEl
+ * @param {Editor} editor
+ */
+function handleTaskListItemClick(event, clickedEl, editor) {
+    const bounds = clickedEl.getBoundingClientRect();
+    const withinBounds = event.clientX <= bounds.right
+        && event.clientX >= bounds.left
+        && event.clientY >= bounds.top
+        && event.clientY <= bounds.bottom;
+
+    // Outside of the task list item bounds mean we're probably clicking the pseudo-element.
+    if (!withinBounds) {
+        editor.undoManager.transact(() => {
+            if (clickedEl.hasAttribute('checked')) {
+                clickedEl.removeAttribute('checked');
+            } else {
+                clickedEl.setAttribute('checked', 'checked');
+            }
+        });
+    }
+}
+
+/**
+ * @param {AstNode} node
+ */
+function parseTaskListNode(node) {
+    // Force task list item class
+    node.attr('class', 'task-list-item');
+
+    // Copy checkbox status and remove checkbox within editor
+    for (const child of node.children()) {
+        if (child.name === 'input') {
+            if (child.attr('checked') === 'checked') {
+                node.attr('checked', 'checked');
+            }
+            child.remove();
+        }
+    }
+}
+
+/**
+ * @param {AstNode} node
+ */
+function serializeTaskListNode(node) {
+    // Get checked status and clean it from list node
+    const isChecked = node.attr('checked') === 'checked';
+    node.attr('checked', null);
+
+    const inputAttrs = {type: 'checkbox', disabled: 'disabled'};
+    if (isChecked) {
+        inputAttrs.checked = 'checked';
+    }
+
+    // Create & insert checkbox input element
+    const checkbox = window.tinymce.html.Node.create('input', inputAttrs);
+    checkbox.shortEnded = true;
+
+    if (node.firstChild) {
+        node.insert(checkbox, node.firstChild, true);
+    } else {
+        node.append(checkbox);
+    }
+}
+
+/**
+ * @param {Editor} editor
+ */
+function register(editor) {
+    // Tasklist UI buttons
+    editor.ui.registry.addIcon('tasklist', '<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24"><path d="M22,8c0-0.55-0.45-1-1-1h-7c-0.55,0-1,0.45-1,1s0.45,1,1,1h7C21.55,9,22,8.55,22,8z M13,16c0,0.55,0.45,1,1,1h7 c0.55,0,1-0.45,1-1c0-0.55-0.45-1-1-1h-7C13.45,15,13,15.45,13,16z M10.47,4.63c0.39,0.39,0.39,1.02,0,1.41l-4.23,4.25 c-0.39,0.39-1.02,0.39-1.42,0L2.7,8.16c-0.39-0.39-0.39-1.02,0-1.41c0.39-0.39,1.02-0.39,1.41,0l1.42,1.42l3.54-3.54 C9.45,4.25,10.09,4.25,10.47,4.63z M10.48,12.64c0.39,0.39,0.39,1.02,0,1.41l-4.23,4.25c-0.39,0.39-1.02,0.39-1.42,0L2.7,16.16 c-0.39-0.39-0.39-1.02,0-1.41s1.02-0.39,1.41,0l1.42,1.42l3.54-3.54C9.45,12.25,10.09,12.25,10.48,12.64L10.48,12.64z"/></svg>');
+    editor.ui.registry.addToggleButton('tasklist', {
+        tooltip: 'Task list',
+        icon: 'tasklist',
+        active: false,
+        onAction(api) {
+            if (api.isActive()) {
+                editor.execCommand('RemoveList');
+            } else {
+                editor.execCommand('InsertUnorderedList', null, {
+                    'list-item-attributes': {
+                        class: 'task-list-item',
+                    },
+                    'list-style-type': 'tasklist',
+                });
+            }
+        },
+        onSetup(api) {
+            editor.on('NodeChange', event => {
+                const parentListEl = event.parents.find(el => el.nodeName === 'LI');
+                const inList = parentListEl && parentListEl.classList.contains('task-list-item');
+                api.setActive(Boolean(inList));
+            });
+        },
+    });
+
+    // Tweak existing bullet list button active state to not be active
+    // when we're in a task list.
+    const existingBullListButton = editor.ui.registry.getAll().buttons.bullist;
+    existingBullListButton.onSetup = function customBullListOnSetup(api) {
+        editor.on('NodeChange', event => {
+            const parentList = event.parents.find(el => el.nodeName === 'LI');
+            const inTaskList = parentList && parentList.classList.contains('task-list-item');
+            const inUlList = parentList && parentList.parentNode.nodeName === 'UL';
+            api.setActive(Boolean(inUlList && !inTaskList));
+        });
+    };
+    existingBullListButton.onAction = function customBullListOnAction() {
+        // Cheeky hack to prevent list toggle action treating tasklists as normal
+        // unordered lists which would unwrap the list on toggle from tasklist to bullet list.
+        // Instead we quickly jump through an ordered list first if we're within a tasklist.
+        if (elementWithinTaskList(editor.selection.getNode())) {
+            editor.execCommand('InsertOrderedList', null, {
+                'list-item-attributes': {class: null},
+            });
+        }
+
+        editor.execCommand('InsertUnorderedList', null, {
+            'list-item-attributes': {class: null},
+        });
+    };
+    // Tweak existing number list to not allow classes on child items
+    const existingNumListButton = editor.ui.registry.getAll().buttons.numlist;
+    existingNumListButton.onAction = function customNumListButtonOnAction() {
+        editor.execCommand('InsertOrderedList', null, {
+            'list-item-attributes': {class: null},
+        });
+    };
+
+    // Setup filters on pre-init
+    editor.on('PreInit', () => {
+        editor.parser.addNodeFilter('li', nodes => {
+            for (const node of nodes) {
+                if (node.attributes.map.class === 'task-list-item') {
+                    parseTaskListNode(node);
+                }
+            }
+        });
+        editor.serializer.addNodeFilter('li', nodes => {
+            for (const node of nodes) {
+                if (node.attributes.map.class === 'task-list-item') {
+                    serializeTaskListNode(node);
+                }
+            }
+        });
+    });
+
+    // Handle checkbox click in editor
+    editor.on('click', event => {
+        const clickedEl = event.target;
+        if (clickedEl.nodeName === 'LI' && clickedEl.classList.contains('task-list-item')) {
+            handleTaskListItemClick(event, clickedEl, editor);
+            event.preventDefault();
+        }
+    });
+}
+
+/**
+ * @return {register}
+ */
+export function getPlugin() {
+    return register;
+}