WIP drag and drop

.devcontainer/Dockerfile

@@ -0,0 +1,16 @@
+# See here for image contents: https://github.com/microsoft/vscode-dev-containers/tree/v0.163.1/containers/javascript-node/.devcontainer/base.Dockerfile
+
+# [Choice] Node.js version: 14, 12, 10
+ARG VARIANT="14-buster"
+FROM mcr.microsoft.com/vscode/devcontainers/javascript-node:0-${VARIANT}
+
+# [Optional] Uncomment this section to install additional OS packages.
+# RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
+#     && apt-get -y install --no-install-recommends <your-package-list-here>
+
+# [Optional] Uncomment if you want to install an additional version of node using nvm
+# ARG EXTRA_NODE_VERSION=10
+# RUN su node -c "source /usr/local/share/nvm/nvm.sh && nvm install ${EXTRA_NODE_VERSION}"
+
+# [Optional] Uncomment if you want to install more global node modules
+# RUN su node -c "npm install -g <your-package-list-here>"

.devcontainer/devcontainer.json

@@ -0,0 +1,29 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the README at:
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.163.1/containers/javascript-node
+{
+	"name": "Node.js",
+	"build": {
+		"dockerfile": "Dockerfile",
+		// Update 'VARIANT' to pick a Node version: 10, 12, 14
+		"args": { "VARIANT": "14" }
+	},
+
+	// Set *default* container specific settings.json values on container create.
+	"settings": { 
+		"terminal.integrated.shell.linux": "/bin/bash"
+	},
+
+	// Add the IDs of extensions you want installed when the container is created.
+	"extensions": [
+		"dbaeumer.vscode-eslint"
+	],
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [],
+
+	// Use 'postCreateCommand' to run commands after the container is created.
+	// "postCreateCommand": "yarn install",
+
+	// Comment out connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
+	"remoteUser": "node"
+}

.vscode/launch.json

@@ -0,0 +1,16 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "pwa-chrome",
+            "request": "launch",
+            "name": "Launch Chrome against localhost",
+            "url": "http://localhost:8080/index.html",
+            "webRoot": "${workspaceFolder}",
+            "trace": true
+        }
+    ]
+}

.vscode/settings.json

@@ -0,0 +1,14 @@
+{
+    "files.eol": "\n",
+      "editor.tabSize": 2,
+      "editor.formatOnPaste": false,
+      "editor.formatOnSave": true,
+      "editor.formatOnType": true,
+      "[javascript]": {
+        "editor.defaultFormatter": "esbenp.prettier-vscode"
+      },
+      "[typescript]": {
+        "editor.defaultFormatter": "esbenp.prettier-vscode"
+      },
+      "files.trimTrailingWhitespace": true
+}

.vscode/tasks.json

@@ -0,0 +1,31 @@
+{
+  "version": "2.0.0",
+  "tasks": [
+    {
+      "label": "npm: build",
+      "type": "npm",
+      "script": "build",
+      "problemMatcher": []
+    },
+    {
+      "label": "npm: watch",
+      "type": "npm",
+      "script": "watch",
+      "problemMatcher": [],
+      "presentation": {
+        "panel": "shared",
+        "group": "test"
+      }
+    },
+    {
+      "label": "npm: serve",
+      "type": "npm",
+      "script": "serve",
+      "problemMatcher": [],
+      "presentation": {
+        "panel": "shared",
+        "group": "test"
+      }
+    }
+  ]
+}

DragDropTouch.js

@@ -0,0 +1,447 @@
+var DragDropTouch;
+(function (DragDropTouch_1) {
+    'use strict';
+    /**
+     * Object used to hold the data that is being dragged during drag and drop operations.
+     *
+     * It may hold one or more data items of different types. For more information about
+     * drag and drop operations and data transfer objects, see
+     * <a href="https://developer.mozilla.org/en-US/docs/Web/API/DataTransfer">HTML Drag and Drop API</a>.
+     *
+     * This object is created automatically by the @see:DragDropTouch singleton and is
+     * accessible through the @see:dataTransfer property of all drag events.
+     */
+    var DataTransfer = (function () {
+        function DataTransfer() {
+            this._dropEffect = 'move';
+            this._effectAllowed = 'all';
+            this._data = {};
+        }
+        Object.defineProperty(DataTransfer.prototype, "dropEffect", {
+            /**
+             * Gets or sets the type of drag-and-drop operation currently selected.
+             * The value must be 'none',  'copy',  'link', or 'move'.
+             */
+            get: function () {
+                return this._dropEffect;
+            },
+            set: function (value) {
+                this._dropEffect = value;
+            },
+            enumerable: true,
+            configurable: true
+        });
+        Object.defineProperty(DataTransfer.prototype, "effectAllowed", {
+            /**
+             * Gets or sets the types of operations that are possible.
+             * Must be one of 'none', 'copy', 'copyLink', 'copyMove', 'link',
+             * 'linkMove', 'move', 'all' or 'uninitialized'.
+             */
+            get: function () {
+                return this._effectAllowed;
+            },
+            set: function (value) {
+                this._effectAllowed = value;
+            },
+            enumerable: true,
+            configurable: true
+        });
+        Object.defineProperty(DataTransfer.prototype, "types", {
+            /**
+             * Gets an array of strings giving the formats that were set in the @see:dragstart event.
+             */
+            get: function () {
+                return Object.keys(this._data);
+            },
+            enumerable: true,
+            configurable: true
+        });
+        /**
+         * Removes the data associated with a given type.
+         *
+         * The type argument is optional. If the type is empty or not specified, the data
+         * associated with all types is removed. If data for the specified type does not exist,
+         * or the data transfer contains no data, this method will have no effect.
+         *
+         * @param type Type of data to remove.
+         */
+        DataTransfer.prototype.clearData = function (type) {
+            if (type != null) {
+                delete this._data[type];
+            }
+            else {
+                this._data = null;
+            }
+        };
+        /**
+         * Retrieves the data for a given type, or an empty string if data for that type does
+         * not exist or the data transfer contains no data.
+         *
+         * @param type Type of data to retrieve.
+         */
+        DataTransfer.prototype.getData = function (type) {
+            return this._data[type] || '';
+        };
+        /**
+         * Set the data for a given type.
+         *
+         * For a list of recommended drag types, please see
+         * https://developer.mozilla.org/en-US/docs/Web/Guide/HTML/Recommended_Drag_Types.
+         *
+         * @param type Type of data to add.
+         * @param value Data to add.
+         */
+        DataTransfer.prototype.setData = function (type, value) {
+            this._data[type] = value;
+        };
+        /**
+         * Set the image to be used for dragging if a custom one is desired.
+         *
+         * @param img An image element to use as the drag feedback image.
+         * @param offsetX The horizontal offset within the image.
+         * @param offsetY The vertical offset within the image.
+         */
+        DataTransfer.prototype.setDragImage = function (img, offsetX, offsetY) {
+            var ddt = DragDropTouch._instance;
+            ddt._imgCustom = img;
+            ddt._imgOffset = { x: offsetX, y: offsetY };
+        };
+        return DataTransfer;
+    }());
+    DragDropTouch_1.DataTransfer = DataTransfer;
+    /**
+     * Defines a class that adds support for touch-based HTML5 drag/drop operations.
+     *
+     * The @see:DragDropTouch class listens to touch events and raises the
+     * appropriate HTML5 drag/drop events as if the events had been caused
+     * by mouse actions.
+     *
+     * The purpose of this class is to enable using existing, standard HTML5
+     * drag/drop code on mobile devices running IOS or Android.
+     *
+     * To use, include the DragDropTouch.js file on the page. The class will
+     * automatically start monitoring touch events and will raise the HTML5
+     * drag drop events (dragstart, dragenter, dragleave, drop, dragend) which
+     * should be handled by the application.
+     *
+     * For details and examples on HTML drag and drop, see
+     * https://developer.mozilla.org/en-US/docs/Web/Guide/HTML/Drag_operations.
+     */
+    var DragDropTouch = (function () {
+        /**
+         * Initializes the single instance of the @see:DragDropTouch class.
+         */
+        function DragDropTouch() {
+            this._lastClick = 0;
+            // enforce singleton pattern
+            if (DragDropTouch._instance) {
+                throw 'DragDropTouch instance already created.';
+            }
+            // detect passive event support
+            // https://github.com/Modernizr/Modernizr/issues/1894
+            var supportsPassive = false;
+            document.addEventListener('test', function () { }, {
+                get passive() {
+                    supportsPassive = true;
+                    return true;
+                }
+            });
+            // listen to touch events
+            if ('ontouchstart' in document) {
+                var d = document, ts = this._touchstart.bind(this), tm = this._touchmove.bind(this), te = this._touchend.bind(this), opt = supportsPassive ? { passive: false, capture: false } : false;
+                d.addEventListener('touchstart', ts, opt);
+                d.addEventListener('touchmove', tm, opt);
+                d.addEventListener('touchend', te);
+                d.addEventListener('touchcancel', te);
+            }
+        }
+        /**
+         * Gets a reference to the @see:DragDropTouch singleton.
+         */
+        DragDropTouch.getInstance = function () {
+            return DragDropTouch._instance;
+        };
+        // ** event handlers
+        DragDropTouch.prototype._touchstart = function (e) {
+            var _this = this;
+            if (this._shouldHandle(e)) {
+                // raise double-click and prevent zooming
+                if (Date.now() - this._lastClick < DragDropTouch._DBLCLICK) {
+                    if (this._dispatchEvent(e, 'dblclick', e.target)) {
+                        e.preventDefault();
+                        this._reset();
+                        return;
+                    }
+                }
+                // clear all variables
+                this._reset();
+                // get nearest draggable element
+                var src = this._closestDraggable(e.target);
+                if (src) {
+                    // give caller a chance to handle the hover/move events
+                    if (!this._dispatchEvent(e, 'mousemove', e.target) &&
+                        !this._dispatchEvent(e, 'mousedown', e.target)) {
+                        // get ready to start dragging
+                        this._dragSource = src;
+                        this._ptDown = this._getPoint(e);
+                        this._lastTouch = e;
+                        e.preventDefault();
+                        // show context menu if the user hasn't started dragging after a while
+                        setTimeout(function () {
+                            if (_this._dragSource == src && _this._img == null) {
+                                if (_this._dispatchEvent(e, 'contextmenu', src)) {
+                                    _this._reset();
+                                }
+                            }
+                        }, DragDropTouch._CTXMENU);
+                        if (DragDropTouch._ISPRESSHOLDMODE) {
+                            this._pressHoldInterval = setTimeout(function () {
+                                _this._isDragEnabled = true;
+                                _this._touchmove(e);
+                            }, DragDropTouch._PRESSHOLDAWAIT);
+                        }
+                    }
+                }
+            }
+        };
+        DragDropTouch.prototype._touchmove = function (e) {
+            if (this._shouldCancelPressHoldMove(e)) {
+              this._reset();
+              return;
+            }
+            if (this._shouldHandleMove(e) || this._shouldHandlePressHoldMove(e)) {
+                // see if target wants to handle move
+                var target = this._getTarget(e);
+                if (this._dispatchEvent(e, 'mousemove', target)) {
+                    this._lastTouch = e;
+                    e.preventDefault();
+                    return;
+                }
+                // start dragging
+                if (this._dragSource && !this._img && this._shouldStartDragging(e)) {
+                    this._dispatchEvent(e, 'dragstart', this._dragSource);
+                    this._createImage(e);
+                    this._dispatchEvent(e, 'dragenter', target);
+                }
+                // continue dragging
+                if (this._img) {
+                    this._lastTouch = e;
+                    e.preventDefault(); // prevent scrolling
+                    if (target != this._lastTarget) {
+                        this._dispatchEvent(this._lastTouch, 'dragleave', this._lastTarget);
+                        this._dispatchEvent(e, 'dragenter', target);
+                        this._lastTarget = target;
+                    }
+                    this._moveImage(e);
+                    this._isDropZone = this._dispatchEvent(e, 'dragover', target);
+                }
+            }
+        };
+        DragDropTouch.prototype._touchend = function (e) {
+            if (this._shouldHandle(e)) {
+                // see if target wants to handle up
+                if (this._dispatchEvent(this._lastTouch, 'mouseup', e.target)) {
+                    e.preventDefault();
+                    return;
+                }
+                // user clicked the element but didn't drag, so clear the source and simulate a click
+                if (!this._img) {
+                    this._dragSource = null;
+                    this._dispatchEvent(this._lastTouch, 'click', e.target);
+                    this._lastClick = Date.now();
+                }
+                // finish dragging
+                this._destroyImage();
+                if (this._dragSource) {
+                    if (e.type.indexOf('cancel') < 0 && this._isDropZone) {
+                        this._dispatchEvent(this._lastTouch, 'drop', this._lastTarget);
+                    }
+                    this._dispatchEvent(this._lastTouch, 'dragend', this._dragSource);
+                    this._reset();
+                }
+            }
+        };
+        // ** utilities
+        // ignore events that have been handled or that involve more than one touch
+        DragDropTouch.prototype._shouldHandle = function (e) {
+            return e &&
+                !e.defaultPrevented &&
+                e.touches && e.touches.length < 2;
+        };
+
+        // use regular condition outside of press & hold mode
+        DragDropTouch.prototype._shouldHandleMove = function (e) {
+          return !DragDropTouch._ISPRESSHOLDMODE && this._shouldHandle(e);
+        };
+
+        // allow to handle moves that involve many touches for press & hold
+        DragDropTouch.prototype._shouldHandlePressHoldMove = function (e) {
+          return DragDropTouch._ISPRESSHOLDMODE &&
+              this._isDragEnabled && e && e.touches && e.touches.length;
+        };
+
+        // reset data if user drags without pressing & holding
+        DragDropTouch.prototype._shouldCancelPressHoldMove = function (e) {
+          return DragDropTouch._ISPRESSHOLDMODE && !this._isDragEnabled &&
+              this._getDelta(e) > DragDropTouch._PRESSHOLDMARGIN;
+        };
+
+        // start dragging when specified delta is detected
+        DragDropTouch.prototype._shouldStartDragging = function (e) {
+            var delta = this._getDelta(e);
+            return delta > DragDropTouch._THRESHOLD ||
+                (DragDropTouch._ISPRESSHOLDMODE && delta >= DragDropTouch._PRESSHOLDTHRESHOLD);
+        }
+
+        // clear all members
+        DragDropTouch.prototype._reset = function () {
+            this._destroyImage();
+            this._dragSource = null;
+            this._lastTouch = null;
+            this._lastTarget = null;
+            this._ptDown = null;
+            this._isDragEnabled = false;
+            this._isDropZone = false;
+            this._dataTransfer = new DataTransfer();
+            clearInterval(this._pressHoldInterval);
+        };
+        // get point for a touch event
+        DragDropTouch.prototype._getPoint = function (e, page) {
+            if (e && e.touches) {
+                e = e.touches[0];
+            }
+            return { x: page ? e.pageX : e.clientX, y: page ? e.pageY : e.clientY };
+        };
+        // get distance between the current touch event and the first one
+        DragDropTouch.prototype._getDelta = function (e) {
+            if (DragDropTouch._ISPRESSHOLDMODE && !this._ptDown) { return 0; }
+            var p = this._getPoint(e);
+            return Math.abs(p.x - this._ptDown.x) + Math.abs(p.y - this._ptDown.y);
+        };
+        // get the element at a given touch event
+        DragDropTouch.prototype._getTarget = function (e) {
+            var pt = this._getPoint(e), el = document.elementFromPoint(pt.x, pt.y);
+            while (el && getComputedStyle(el).pointerEvents == 'none') {
+                el = el.parentElement;
+            }
+            return el;
+        };
+        // create drag image from source element
+        DragDropTouch.prototype._createImage = function (e) {
+            // just in case...
+            if (this._img) {
+                this._destroyImage();
+            }
+            // create drag image from custom element or drag source
+            var src = this._imgCustom || this._dragSource;
+            this._img = src.cloneNode(true);
+            this._copyStyle(src, this._img);
+            this._img.style.top = this._img.style.left = '-9999px';
+            // if creating from drag source, apply offset and opacity
+            if (!this._imgCustom) {
+                var rc = src.getBoundingClientRect(), pt = this._getPoint(e);
+                this._imgOffset = { x: pt.x - rc.left, y: pt.y - rc.top };
+                this._img.style.opacity = DragDropTouch._OPACITY.toString();
+            }
+            // add image to document
+            this._moveImage(e);
+            document.body.appendChild(this._img);
+        };
+        // dispose of drag image element
+        DragDropTouch.prototype._destroyImage = function () {
+            if (this._img && this._img.parentElement) {
+                this._img.parentElement.removeChild(this._img);
+            }
+            this._img = null;
+            this._imgCustom = null;
+        };
+        // move the drag image element
+        DragDropTouch.prototype._moveImage = function (e) {
+            var _this = this;
+            requestAnimationFrame(function () {
+                if (_this._img) {
+                    var pt = _this._getPoint(e, true), s = _this._img.style;
+                    s.position = 'absolute';
+                    s.pointerEvents = 'none';
+                    s.zIndex = '999999';
+                    s.left = Math.round(pt.x - _this._imgOffset.x) + 'px';
+                    s.top = Math.round(pt.y - _this._imgOffset.y) + 'px';
+                }
+            });
+        };
+        // copy properties from an object to another
+        DragDropTouch.prototype._copyProps = function (dst, src, props) {
+            for (var i = 0; i < props.length; i++) {
+                var p = props[i];
+                dst[p] = src[p];
+            }
+        };
+        DragDropTouch.prototype._copyStyle = function (src, dst) {
+            // remove potentially troublesome attributes
+            DragDropTouch._rmvAtts.forEach(function (att) {
+                dst.removeAttribute(att);
+            });
+            // copy canvas content
+            if (src instanceof HTMLCanvasElement) {
+                var cSrc = src, cDst = dst;
+                cDst.width = cSrc.width;
+                cDst.height = cSrc.height;
+                cDst.getContext('2d').drawImage(cSrc, 0, 0);
+            }
+            // copy style (without transitions)
+            var cs = getComputedStyle(src);
+            for (var i = 0; i < cs.length; i++) {
+                var key = cs[i];
+                if (key.indexOf('transition') < 0) {
+                    dst.style[key] = cs[key];
+                }
+            }
+            dst.style.pointerEvents = 'none';
+            // and repeat for all children
+            for (var i = 0; i < src.children.length; i++) {
+                this._copyStyle(src.children[i], dst.children[i]);
+            }
+        };
+        DragDropTouch.prototype._dispatchEvent = function (e, type, target) {
+            if (e && target) {
+                var evt = document.createEvent('Event'), t = e.touches ? e.touches[0] : e;
+                evt.initEvent(type, true, true);
+                evt.button = 0;
+                evt.which = evt.buttons = 1;
+                this._copyProps(evt, e, DragDropTouch._kbdProps);
+                this._copyProps(evt, t, DragDropTouch._ptProps);
+                evt.dataTransfer = this._dataTransfer;
+                target.dispatchEvent(evt);
+                return evt.defaultPrevented;
+            }
+            return false;
+        };
+        // gets an element's closest draggable ancestor
+        DragDropTouch.prototype._closestDraggable = function (e) {
+            for (; e; e = e.parentElement) {
+                if (e.hasAttribute('draggable') && e.draggable) {
+                    return e;
+                }
+            }
+            return null;
+        };
+        return DragDropTouch;
+    }());
+    /*private*/ DragDropTouch._instance = new DragDropTouch(); // singleton
+    // constants
+    DragDropTouch._THRESHOLD = 5; // pixels to move before drag starts
+    DragDropTouch._OPACITY = 0.5; // drag image opacity
+    DragDropTouch._DBLCLICK = 500; // max ms between clicks in a double click
+    DragDropTouch._CTXMENU = 900; // ms to hold before raising 'contextmenu' event
+    DragDropTouch._ISPRESSHOLDMODE = false; // decides of press & hold mode presence
+    DragDropTouch._PRESSHOLDAWAIT = 400; // ms to wait before press & hold is detected
+    DragDropTouch._PRESSHOLDMARGIN = 25; // pixels that finger might shiver while pressing
+    DragDropTouch._PRESSHOLDTHRESHOLD = 0; // pixels to move before drag starts
+    // copy styles/attributes from drag source to drag image element
+    DragDropTouch._rmvAtts = 'id,class,style,draggable'.split(',');
+    // synthesize and dispatch an event
+    // returns true if the event has been handled (e.preventDefault == true)
+    DragDropTouch._kbdProps = 'altKey,ctrlKey,metaKey,shiftKey'.split(',');
+    DragDropTouch._ptProps = 'pageX,pageY,clientX,clientY,screenX,screenY,offsetX,offsetY'.split(',');
+    DragDropTouch_1.DragDropTouch = DragDropTouch;
+})(DragDropTouch || (DragDropTouch = {}));

index.html

@@ -2,8 +2,9 @@
 <html>
   <head>
     <title>Script graph demo</title>
+    <script src="DragDropTouch.js"></script>
     <script src="https://cdnjs.cloudflare.com/ajax/libs/js-yaml/3.14.0/js-yaml.min.js"></script>
-    <script src="index.js" type="module"></script>
+    <script src="index.js" type="module" defer></script>
   </head>
   <body style="margin: 24px">
   <style>
@@ -22,7 +23,7 @@
       white-space: pre-wrap;
     }
     #graph {
-      max-width: 400px;
+      max-width: 600px;
       overflow: auto;
     }
     .code {
@@ -35,11 +36,6 @@
     <div>
       <div class="card" id="graph">
       </div>
-      <div class="card" id="graph2">
-        <script-graph3>
-          <script-graph-node></script-graph-node>
-        </script-graph3>
-      </div>
       <div class="card code">
         <h1> Selected node code </h1>
         <wc-codemirror mode="json" id="snippet">

package-lock.json

@@ -70,24 +70,94 @@
       "resolved": "https://registry.npmjs.org/@vanillawc/wc-codemirror/-/wc-codemirror-1.8.10.tgz",
       "integrity": "sha512-UKMD/UOpF1uRl29nlwvwQqSMBqsl+uDWYlGx82wIYbIBJkeqPrSo1Ez1rGi9jc1CL7/XwUr7u+l/kTwZAEkrEg=="
     },
+    "async": {
+      "version": "2.6.3",
+      "resolved": "https://registry.npmjs.org/async/-/async-2.6.3.tgz",
+      "integrity": "sha512-zflvls11DCy+dQWzTW2dzuilv8Z5X/pjfmZOWba6TNIVDm+2UDaJmXSOXlasHKfNBs8oo3M0aT50fDEWfKZjXg==",
+      "dev": true,
+      "requires": {
+        "lodash": "^4.17.14"
+      }
+    },
+    "basic-auth": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/basic-auth/-/basic-auth-1.1.0.tgz",
+      "integrity": "sha1-RSIe5Cn37h5QNb4/UVM/HN/SmIQ=",
+      "dev": true
+    },
     "builtin-modules": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/builtin-modules/-/builtin-modules-3.1.0.tgz",
       "integrity": "sha512-k0KL0aWZuBt2lrxrcASWDfwOLMnodeQjodT/1SxEQAXsHANgo6ZC/VEaSEHCXt7aSTZ4/4H5LKa+tBXmW7Vtvw==",
       "dev": true
     },
+    "call-bind": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/call-bind/-/call-bind-1.0.2.tgz",
+      "integrity": "sha512-7O+FbCihrB5WGbFYesctwmTKae6rOiIzmz1icreWJ+0aA7LJfuqhEso2T9ncpcFtzMQtzXf2QGGueWJGTYsqrA==",
+      "dev": true,
+      "requires": {
+        "function-bind": "^1.1.1",
+        "get-intrinsic": "^1.0.2"
+      }
+    },
+    "colors": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/colors/-/colors-1.4.0.tgz",
+      "integrity": "sha512-a+UqTh4kgZg/SlGvfbzDHpgRu7AAQOmmqRHJnxhRZICKFUT91brVhNNt58CMWU9PsBbv3PDCZUHbVxuDiH2mtA==",
+      "dev": true
+    },
+    "corser": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/corser/-/corser-2.0.1.tgz",
+      "integrity": "sha1-jtolLsqrWEDc2XXOuQ2TcMgZ/4c=",
+      "dev": true
+    },
+    "debug": {
+      "version": "3.2.7",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-3.2.7.tgz",
+      "integrity": "sha512-CFjzYYAi4ThfiQvizrFQevTTXHtnCqWfe7x1AhgEscTz6ZbLbfoLRLPugTQyBth6f8ZERVUSyWHFD/7Wu4t1XQ==",
+      "dev": true,
+      "requires": {
+        "ms": "^2.1.1"
+      }
+    },
     "deepmerge": {
       "version": "4.2.2",
       "resolved": "https://registry.npmjs.org/deepmerge/-/deepmerge-4.2.2.tgz",
       "integrity": "sha512-FJ3UgI4gIl+PHZm53knsuSFpE+nESMr7M4v9QcgB7S63Kj/6WqMiFQJpBBYz1Pt+66bZpP3Q7Lye0Oo9MPKEdg==",
       "dev": true
     },
+    "ecstatic": {
+      "version": "3.3.2",
+      "resolved": "https://registry.npmjs.org/ecstatic/-/ecstatic-3.3.2.tgz",
+      "integrity": "sha512-fLf9l1hnwrHI2xn9mEDT7KIi22UDqA2jaCwyCbSUJh9a1V+LEUSL/JO/6TIz/QyuBURWUHrFL5Kg2TtO1bkkog==",
+      "dev": true,
+      "requires": {
+        "he": "^1.1.1",
+        "mime": "^1.6.0",
+        "minimist": "^1.1.0",
+        "url-join": "^2.0.5"
+      }
+    },
     "estree-walker": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/estree-walker/-/estree-walker-1.0.1.tgz",
       "integrity": "sha512-1fMXF3YP4pZZVozF8j/ZLfvnR8NSIljt56UhbZ5PeeDmmGHpgpdwQt7ITlGvYaQukCvuBRMLEiKiYC+oeIg4cg==",
       "dev": true
     },
+    "eventemitter3": {
+      "version": "4.0.7",
+      "resolved": "https://registry.npmjs.org/eventemitter3/-/eventemitter3-4.0.7.tgz",
+      "integrity": "sha512-8guHBZCwKnFhYdHr2ysuRWErTwhoN2X8XELRlrRwpmfeY2jjuUN4taQMsULKUVo1K4DvZl+0pgfyoysHxvmvEw==",
+      "dev": true
+    },
+    "follow-redirects": {
+      "version": "1.13.3",
+      "resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.13.3.tgz",
+      "integrity": "sha512-DUgl6+HDzB0iEptNQEXLx/KhTmDb8tZUHSeLqpnjpknR70H0nC2t9N73BK6fN4hOvJ84pKlIQVQ4k5FFlBedKA==",
+      "dev": true
+    },
     "fsevents": {
       "version": "2.1.3",
       "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.1.3.tgz",
@@ -95,6 +165,73 @@
       "dev": true,
       "optional": true
     },
+    "function-bind": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/function-bind/-/function-bind-1.1.1.tgz",
+      "integrity": "sha512-yIovAzMX49sF8Yl58fSCWJ5svSLuaibPxXQJFLmBObTuCr0Mf1KiPopGM9NiFjiYBCbfaa2Fh6breQ6ANVTI0A==",
+      "dev": true
+    },
+    "get-intrinsic": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/get-intrinsic/-/get-intrinsic-1.1.1.tgz",
+      "integrity": "sha512-kWZrnVM42QCiEA2Ig1bG8zjoIMOgxWwYCEeNdwY6Tv/cOSeGpcoX4pXHfKUxNKVoArnrEr2e9srnAxxGIraS9Q==",
+      "dev": true,
+      "requires": {
+        "function-bind": "^1.1.1",
+        "has": "^1.0.3",
+        "has-symbols": "^1.0.1"
+      }
+    },
+    "has": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/has/-/has-1.0.3.tgz",
+      "integrity": "sha512-f2dvO0VU6Oej7RkWJGrehjbzMAjFp5/VKPp5tTpWIV4JHHZK1/BxbFRtf/siA2SWTe09caDmVtYYzWEIbBS4zw==",
+      "dev": true,
+      "requires": {
+        "function-bind": "^1.1.1"
+      }
+    },
+    "has-symbols": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/has-symbols/-/has-symbols-1.0.2.tgz",
+      "integrity": "sha512-chXa79rL/UC2KlX17jo3vRGz0azaWEx5tGqZg5pO3NUyEJVB17dMruQlzCCOfUvElghKcm5194+BCRvi2Rv/Gw==",
+      "dev": true
+    },
+    "he": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/he/-/he-1.2.0.tgz",
+      "integrity": "sha512-F/1DnUGPopORZi0ni+CvrCgHQ5FyEAHRLSApuYWMmrbSwoN2Mn/7k+Gl38gJnR7yyDZk6WLXwiGod1JOWNDKGw==",
+      "dev": true
+    },
+    "http-proxy": {
+      "version": "1.18.1",
+      "resolved": "https://registry.npmjs.org/http-proxy/-/http-proxy-1.18.1.tgz",
+      "integrity": "sha512-7mz/721AbnJwIVbnaSv1Cz3Am0ZLT/UBwkC92VlxhXv/k/BBQfM2fXElQNC27BVGr0uwUpplYPQM9LnaBMR5NQ==",
+      "dev": true,
+      "requires": {
+        "eventemitter3": "^4.0.0",
+        "follow-redirects": "^1.0.0",
+        "requires-port": "^1.0.0"
+      }
+    },
+    "http-server": {
+      "version": "0.12.3",
+      "resolved": "https://registry.npmjs.org/http-server/-/http-server-0.12.3.tgz",
+      "integrity": "sha512-be0dKG6pni92bRjq0kvExtj/NrrAd28/8fCXkaI/4piTwQMSDSLMhWyW0NI1V+DBI3aa1HMlQu46/HjVLfmugA==",
+      "dev": true,
+      "requires": {
+        "basic-auth": "^1.0.3",
+        "colors": "^1.4.0",
+        "corser": "^2.0.1",
+        "ecstatic": "^3.3.2",
+        "http-proxy": "^1.18.0",
+        "minimist": "^1.2.5",
+        "opener": "^1.5.1",
+        "portfinder": "^1.0.25",
+        "secure-compare": "3.0.1",
+        "union": "~0.5.0"
+      }
+    },
     "is-module": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/is-module/-/is-module-1.0.0.tgz",
@@ -114,6 +251,51 @@
       "resolved": "https://registry.npmjs.org/lit-html/-/lit-html-1.2.1.tgz",
       "integrity": "sha512-GSJHHXMGLZDzTRq59IUfL9FCdAlGfqNp/dEa7k7aBaaWD+JKaCjsAk9KYm2V12ItonVaYx2dprN66Zdm1AuBTQ=="
     },
+    "lodash": {
+      "version": "4.17.21",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz",
+      "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==",
+      "dev": true
+    },
+    "mime": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/mime/-/mime-1.6.0.tgz",
+      "integrity": "sha512-x0Vn8spI+wuJ1O6S7gnbaQg8Pxh4NNHb7KSINmEWKiPE4RKOplvijn+NkmYmmRgP68mc70j2EbeTFRsrswaQeg==",
+      "dev": true
+    },
+    "minimist": {
+      "version": "1.2.5",
+      "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.5.tgz",
+      "integrity": "sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw==",
+      "dev": true
+    },
+    "mkdirp": {
+      "version": "0.5.5",
+      "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.5.tgz",
+      "integrity": "sha512-NKmAlESf6jMGym1++R0Ra7wvhV+wFW63FaSOFPwRahvea0gMUcGUhVeAg/0BC0wiv9ih5NYPB1Wn1UEI1/L+xQ==",
+      "dev": true,
+      "requires": {
+        "minimist": "^1.2.5"
+      }
+    },
+    "ms": {
+      "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
+      "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
+      "dev": true
+    },
+    "object-inspect": {
+      "version": "1.9.0",
+      "resolved": "https://registry.npmjs.org/object-inspect/-/object-inspect-1.9.0.tgz",
+      "integrity": "sha512-i3Bp9iTqwhaLZBxGkRfo5ZbE07BQRT7MGu8+nNgwW9ItGp1TzCTw2DLEoWwjClxBjOFI/hWljTAmYGCEwmtnOw==",
+      "dev": true
+    },
+    "opener": {
+      "version": "1.5.2",
+      "resolved": "https://registry.npmjs.org/opener/-/opener-1.5.2.tgz",
+      "integrity": "sha512-ur5UIdyw5Y7yEj9wLzhqXiy6GZ3Mwx0yGI+5sMn2r0N0v3cKJvUmFH5yPP+WXh9e0xfyzyJX95D8l088DNFj7A==",
+      "dev": true
+    },
     "path-parse": {
       "version": "1.0.6",
       "resolved": "https://registry.npmjs.org/path-parse/-/path-parse-1.0.6.tgz",
@@ -126,6 +308,32 @@
       "integrity": "sha512-q0M/9eZHzmr0AulXyPwNfZjtwZ/RBZlbN3K3CErVrk50T2ASYI7Bye0EvekFY3IP1Nt2DHu0re+V2ZHIpMkuWg==",
       "dev": true
     },
+    "portfinder": {
+      "version": "1.0.28",
+      "resolved": "https://registry.npmjs.org/portfinder/-/portfinder-1.0.28.tgz",
+      "integrity": "sha512-Se+2isanIcEqf2XMHjyUKskczxbPH7dQnlMjXX6+dybayyHvAf/TCgyMRlzf/B6QDhAEFOGes0pzRo3by4AbMA==",
+      "dev": true,
+      "requires": {
+        "async": "^2.6.2",
+        "debug": "^3.1.1",
+        "mkdirp": "^0.5.5"
+      }
+    },
+    "qs": {
+      "version": "6.10.1",
+      "resolved": "https://registry.npmjs.org/qs/-/qs-6.10.1.tgz",
+      "integrity": "sha512-M528Hph6wsSVOBiYUnGf+K/7w0hNshs/duGsNXPUCLH5XAqjEtiPGwNONLV0tBH8NoGb0mvD5JubnUTrujKDTg==",
+      "dev": true,
+      "requires": {
+        "side-channel": "^1.0.4"
+      }
+    },
+    "requires-port": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/requires-port/-/requires-port-1.0.0.tgz",
+      "integrity": "sha1-kl0mAdOaxIXgkc8NpcbmlNw9yv8=",
+      "dev": true
+    },
     "resolve": {
       "version": "1.17.0",
       "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.17.0.tgz",
@@ -144,6 +352,23 @@
         "fsevents": "~2.1.2"
       }
     },
+    "secure-compare": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/secure-compare/-/secure-compare-3.0.1.tgz",
+      "integrity": "sha1-8aAymzCLIh+uN7mXTz1XjQypmeM=",
+      "dev": true
+    },
+    "side-channel": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/side-channel/-/side-channel-1.0.4.tgz",
+      "integrity": "sha512-q5XPytqFEIKHkGdiMIrY10mvLRvnQh42/+GoBlFW3b2LXLE2xxJpZFdm94we0BaoV3RwJyGqg5wS7epxTv0Zvw==",
+      "dev": true,
+      "requires": {
+        "call-bind": "^1.0.0",
+        "get-intrinsic": "^1.0.2",
+        "object-inspect": "^1.9.0"
+      }
+    },
     "tslib": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.0.1.tgz",
@@ -155,6 +380,21 @@
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.0.2.tgz",
       "integrity": "sha512-e4ERvRV2wb+rRZ/IQeb3jm2VxBsirQLpQhdxplZ2MEzGvDkkMmPglecnNDfSUBivMjP93vRbngYYDQqQ/78bcQ==",
       "dev": true
+    },
+    "union": {
+      "version": "0.5.0",
+      "resolved": "https://registry.npmjs.org/union/-/union-0.5.0.tgz",
+      "integrity": "sha512-N6uOhuW6zO95P3Mel2I2zMsbsanvvtgn6jVqJv4vbVcz/JN0OkL9suomjQGmWtxJQXOCqUJvquc1sMeNz/IwlA==",
+      "dev": true,
+      "requires": {
+        "qs": "^6.4.0"
+      }
+    },
+    "url-join": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/url-join/-/url-join-2.0.5.tgz",
+      "integrity": "sha1-WvIvGMBSoACkjXuCxenC4v7tpyg=",
+      "dev": true
     }
   }
 }

package.json

@@ -6,13 +6,15 @@
   "main": "index.js",
   "scripts": {
     "build": "rollup -c",
-    "watch": "rollup -c -w"
+    "watch": "rollup -c --watch",
+    "serve": "http-server ."
   },
   "author": "",
   "license": "ISC",
   "devDependencies": {
     "@rollup/plugin-node-resolve": "^9.0.0",
     "@rollup/plugin-typescript": "^5.0.2",
+    "http-server": "^0.12.3",
     "rollup": "^2.26.4",
     "tslib": "^2.0.1",
     "typescript": "^4.0.2"

rollup.config.js

@@ -1,13 +1,11 @@
-import resolve from "@rollup/plugin-node-resolve";
+import nodeResolve from "@rollup/plugin-node-resolve";
 import typescript from "@rollup/plugin-typescript";
 
 export default {
-  input: "./src/main.js",
+  input: "src/main.js",
-  output: [
+  output: {
-    {
     file: "index.js",
-      format: "cjs"
+    format: "es",
-    }
+  },
-  ],
+  plugins: [nodeResolve(), typescript()],
-  plugins: [resolve(), typescript()]
 };

src/hat-graph/hat-graph-node.ts

@@ -0,0 +1,104 @@
+import { css, LitElement, property, svg } from "lit-element";
+
+const NODE_SIZE = 24;
+
+export class HatGraphNode extends LitElement {
+  @property() iconPath?;
+  dragtarget = undefined;
+  config = undefined;
+
+  connectedCallback() {
+    super.connectedCallback();
+    if (!this.hasAttribute("tabindex")) this.setAttribute("tabindex", "0");
+
+    this.addEventListener("dragstart", () => {
+      this.classList.add("dragging");
+      (window as any)._dragElement = this.dragtarget ?? this;
+      this.updateNode("");
+    });
+    this.addEventListener("dragend", () => {
+      this.classList.remove("dragging");
+      (window as any)._dragElement = undefined;
+    });
+  }
+
+  updateNode(config) {
+    this.dispatchEvent(
+      new CustomEvent("update-node", {
+        detail: { config },
+        bubbles: true,
+        composed: true,
+      })
+    );
+  }
+
+  deleteNode() {
+    this.dispatchEvent(new CustomEvent("delete-node", { bubbles: true }));
+  }
+
+  placeNode(config) {
+    this.dispatchEvent(
+      new CustomEvent("place-node", { detail: { config }, bubbles: true })
+    );
+  }
+
+  get width() {
+    return NODE_SIZE + 5;
+  }
+  get height() {
+    return NODE_SIZE + 5;
+  }
+  render() {
+    return svg`
+    <svg
+      width="${this.width}"
+      height="${this.height}"
+      viewBox="${-this.width / 2} 0 ${this.width} ${this.height}"
+    >
+      <circle
+        cx="0"
+        cy="${this.width / 2}"
+        r="${NODE_SIZE / 2}"
+      />
+      <g
+        style="pointer-events: none"
+        transform="translate(${-12} ${this.width / 2 - 12})"
+      >
+        ${this.iconPath ? svg`<path d="${this.iconPath}"/>` : ""}
+      </g>
+      </svg>
+    `;
+  }
+
+  static get styles() {
+    return css`
+      :host {
+        display: flex;
+        --stroke-clr: var(--stroke-color, rgb(3, 169, 244));
+        --hover-clr: var(--hover-color, rgb(255, 152, 0));
+      }
+      :host(:hover) {
+        --stroke-clr: var(--hover-clr);
+      }
+      :host(:focus) {
+        --stroke-clr: green;
+        outline: none;
+      }
+      :host(.dragging) {
+        --stroke-clr: gray;
+        color: gray;
+      }
+      :host(.dragging) path {
+        stroke: gray;
+        fill: gray;
+      }
+      circle {
+        stroke: var(--stroke-clr);
+        stroke-width: 2;
+        fill: white;
+      }
+    `;
+  }
+}
+
+customElements.define("hat-graph-node", HatGraphNode);

src/hat-graph/hat-graph.ts

@@ -0,0 +1,183 @@
+import { css, html, LitElement, property, svg } from "lit-element";
+
+import "./hat-graph-node";
+
+const BRANCH_HEIGHT = 30;
+const BRANCH_CURVATURE = 25;
+const VERTICAL_SPACING = 10;
+const NODE_SIZE = 24;
+
+export class HatGraph extends LitElement {
+  @property() _num_items = 0;
+
+  @property({ reflect: true }) branching?;
+  config?;
+
+  updateNode(config) {
+    this.dispatchEvent(
+      new CustomEvent("update-node", {
+        detail: { config },
+        bubbles: true,
+        composed: true,
+      })
+    );
+  }
+
+  deleteNode() {
+    this.dispatchEvent(new CustomEvent("delete-node", { bubbles: true }));
+  }
+
+  placeNode(config) {
+    this.dispatchEvent(
+      new CustomEvent("place-node", { detail: { config }, bubbles: true })
+    );
+  }
+
+  get width() {
+    let w = 0;
+    if (this.branching !== undefined) {
+      for (const c of this.children) {
+        if (c.slot === "head") continue;
+        w += (c as any).width;
+      }
+    } else {
+      for (const c of this.children) {
+        w = Math.max(w, (c as any).width);
+      }
+    }
+    return w;
+  }
+  get height() {
+    let h = 0;
+    if (this.branching !== undefined) {
+      for (const c of this.children) {
+        if (c.slot === "head") continue;
+        h = Math.max(h, (c as any).height);
+      }
+      h += 2 * BRANCH_HEIGHT;
+    } else {
+      for (const c of this.children) {
+        h += (c as any).height + VERTICAL_SPACING;
+      }
+      h;
+    }
+    return h;
+  }
+
+  async updateChildren() {
+    this._num_items = this.children.length;
+  }
+
+  render() {
+    let branch_x = [];
+    let total = 0;
+    if (this.branching !== undefined) {
+      for (const c of Array.from(this.children)) {
+        if (c.slot === "head") continue;
+        const rect = c.getBoundingClientRect();
+        branch_x.push(rect.width / 2 + total);
+        total += rect.width;
+      }
+    }
+
+    const line_end = this.height - BRANCH_HEIGHT;
+
+    return html`
+      <svg width="${this.width}" height="${this.height}">
+        <rect
+          x="0"
+          y="0"
+          width="${this.width}"
+          height="${this.height}"
+          fill="white"
+        />
+        ${this.branching !== undefined
+          ? branch_x.map((x) => {
+              return svg`
+                <path
+                  class="line"
+                  d="
+                    M ${this.width / 2} 0
+                    C ${this.width / 2} ${BRANCH_CURVATURE}
+                      ${x} ${BRANCH_HEIGHT - BRANCH_CURVATURE}
+                      ${x} ${BRANCH_HEIGHT}
+                    L ${x} ${line_end}
+                    C ${x} ${line_end + BRANCH_CURVATURE}
+                      ${this.width / 2} ${this.height - BRANCH_CURVATURE}
+                      ${this.width / 2} ${this.height}
+                  "
+                />
+              `;
+            })
+          : svg`
+              <path
+              class="line"
+              d="
+                M ${this.width / 2} 0
+                L ${this.width / 2} ${this.height}
+              "
+              />
+            `}
+      </svg>
+      <slot name="head"> </slot>
+      <div
+        id="branches"
+        class="${this.querySelector(":scope > [slot='head']") ? "" : "no-head"}"
+      >
+        <slot @slotchange=${this.updateChildren}></slot>
+      </div>
+    `;
+  }
+
+  static get styles() {
+    return css`
+      :host {
+        position: relative;
+        display: flex;
+        --stroke-clr: var(--stroke-color, rgb(3, 169, 244));
+        --hover-clr: var(--hover-color, rgb(255, 152, 0));
+      }
+      #branches {
+        position: absolute;
+        left: 0;
+        display: flex;
+        flex-direction: row;
+        align-items: center;
+      }
+      :host([branching]) #branches {
+        top: ${BRANCH_HEIGHT}px;
+        flex-direction: row;
+        align-items: start;
+      }
+      :host(:not([branching])) #branches {
+        top: ${VERTICAL_SPACING + NODE_SIZE}px; /* SHould be something else*/
+        flex-direction: column;
+      }
+      :host(:not([branching])) #branches.no-head {
+        top: 0;
+      }
+      path.line {
+        stroke: var(--stroke-clr);
+        stroke-width: 2;
+        fill: none;
+      }
+      :host(:not([branching])) ::slotted(*) {
+        margin-bottom: 10px;
+      }
+      ::slotted(:last-child) {
+        margin-bottom: 0;
+      }
+      ::slotted([slot="head"]) {
+        position: absolute;
+        top: ${BRANCH_HEIGHT / 2}px;
+        left: 50%;
+        transform: translate(-50%, -50%);
+      }
+      :host(:focus-within) ::slotted([slot="head"]) {
+        --stroke-color: green;
+      }
+    `;
+  }
+}
+
+customElements.define("hat-graph", HatGraph);

src/hat-graph/make-graph.ts

@@ -0,0 +1,259 @@
+import { HatGraphNode } from "./hat-graph-node";
+
+import {
+  mdiCallSplit,
+  mdiAbTesting,
+  mdiCheck,
+  mdiClose,
+  mdiChevronRight,
+  mdiExclamation,
+  mdiTimerOutline,
+  mdiTrafficLight,
+  mdiRefresh,
+  mdiArrowUp,
+  mdiCodeJson,
+  mdiCheckBoxOutline,
+  mdiCheckboxBlankOutline,
+  mdiAsterisk,
+} from "@mdi/js";
+import { HatGraph } from "./hat-graph";
+import { html } from "lit-element";
+import { render } from "lit-html";
+
+const OPTIONS = [
+  "condition",
+  "delay",
+  "device_id",
+  "event",
+  "scene",
+  "service",
+  "wait_template",
+  "repeat",
+  "choose",
+];
+
+const ICONS = {
+  new: mdiAsterisk,
+  service: mdiChevronRight,
+  condition: mdiAbTesting,
+  TRUE: mdiCheck,
+  FALSE: mdiClose,
+  delay: mdiTimerOutline,
+  wait_template: mdiTrafficLight,
+  event: mdiExclamation,
+  repeat: mdiRefresh,
+  repeatReturn: mdiArrowUp,
+  choose: mdiCallSplit,
+  chooseChoice: mdiCheckBoxOutline,
+  chooseDefault: mdiCheckboxBlankOutline,
+  YAML: mdiCodeJson,
+};
+
+const SPECIAL_NODES = {
+  condition: makeConditionNode,
+  choose: makeChooseNode,
+  repeat: makeRepeatNode,
+};
+
+function makeConditionNode(config) {
+  const graph = document.createElement("hat-graph") as HatGraph;
+  graph.branching = true;
+  const focused = () =>
+    graph.dispatchEvent(
+      new CustomEvent("node-selected", { detail: { config }, bubbles: true })
+    );
+
+  render(
+    html`
+      <hat-graph-node slot="head" .iconPath=${mdiAbTesting} @focus=${focused}>
+      </hat-graph-node>
+      <hat-graph-node .iconPath=${mdiCheck} @focus=${focused}></hat-graph-node>
+      <hat-graph-node .iconPath=${mdiClose} @focus=${focused}></hat-graph-node>
+    `,
+    graph
+  );
+  return graph;
+}
+
+function makeChooseNode(config) {
+  const graph = document.createElement("hat-graph") as HatGraph;
+  graph.config = config;
+  graph.branching = true;
+
+  const focused = () =>
+    graph.dispatchEvent(
+      new CustomEvent("node-selected", { detail: { config }, bubbles: true })
+    );
+
+  render(
+    html`
+      <hat-graph-node
+        slot="head"
+        .iconPath="${mdiCallSplit}"
+        @focus=${focused}
+        draggable="true"
+        .dragtarget=${graph}
+      >
+      </hat-graph-node>
+      ${config.choose?.map((branch) => {
+        const head = document.createElement("hat-graph-node") as HatGraphNode;
+        head.iconPath = mdiCheckBoxOutline;
+        head.addEventListener("focus", focused);
+
+        return makeGraph(branch.sequence, head);
+      })}
+      ${(() => {
+        const head = document.createElement("hat-graph-node") as HatGraphNode;
+        head.iconPath = mdiCheckboxBlankOutline;
+        head.addEventListener("focus", focused);
+        return makeGraph(config.default, head);
+      })()}
+    `,
+    graph
+  );
+  return graph;
+}
+
+function makeRepeatNode(config) {
+  const graph = document.createElement("hat-graph") as HatGraph;
+  graph.branching = true;
+
+  const focused = () =>
+    graph.dispatchEvent(
+      new CustomEvent("node-selected", { detail: { config }, bubbles: true })
+    );
+
+  render(
+    html`
+      <hat-graph-node
+        .iconPath=${mdiArrowUp}
+        @focus=${focused}
+      ></hat-graph-node>
+      ${makeGraph(config.repeat.sequence)}
+    `,
+    graph
+  );
+  return graph;
+}
+
+function makeNode(config) {
+  if (typeof config === "string") return undefined;
+  const type = OPTIONS.find((key) => key in config) || "yaml";
+
+  if (type in SPECIAL_NODES) {
+    return SPECIAL_NODES[type](config);
+  }
+
+  const node = document.createElement("hat-graph-node") as HatGraphNode;
+
+  node.iconPath = ICONS[type];
+  node.draggable = true;
+
+  node.config = config;
+
+  node.addEventListener("focus", (ev) => {
+    node.dispatchEvent(
+      new CustomEvent("node-selected", { detail: { config }, bubbles: true })
+    );
+  });
+
+  return node;
+}
+
+export function makeGraph(nodes, head = undefined) {
+  const graph = document.createElement("hat-graph") as HatGraph;
+  graph.addEventListener("dragenter", (ev) => {
+    ev.stopPropagation();
+    ev.preventDefault();
+    try {
+      graph.appendChild((window as any)._dragElement);
+    } catch (e) {
+      if (!(e instanceof DOMException)) throw e;
+    }
+  });
+  (graph as any).test = "Hello!";
+
+  if (head) {
+    head.slot = "head";
+    graph.appendChild(head);
+  }
+
+  for (const [i, nodeConfig] of nodes.entries()) {
+    const node = makeNode(nodeConfig);
+    if (!node) {
+      window.setTimeout(() => {
+        const config = [...nodes];
+        config.splice(i, 1);
+
+        graph.dispatchEvent(
+          new CustomEvent("update-node", { detail: { config }, bubbles: true })
+        );
+      }, 100);
+      continue;
+    }
+
+    node.addEventListener("dragover", (ev) => {
+      ev.stopPropagation();
+      ev.preventDefault();
+    });
+    node.addEventListener("dragenter", (ev) => {
+      ev.stopPropagation();
+      ev.preventDefault();
+      if (node === (window as any)._dragElement) return;
+      try {
+        graph.insertBefore((window as any)._dragElement, node);
+        (window as any)._dragTarget = node;
+      } catch (e) {
+        if (!(e instanceof DOMException)) throw e;
+      }
+    });
+
+    node.addEventListener("drop", (ev) => {
+      ev.stopPropagation();
+      ev.preventDefault();
+      if ((window as any)._dragTarget) {
+        console.log("Drop onto ", (window as any)._dragTarget);
+        const config = { ...(window as any)._dragElement.config };
+        (window as any)._dragTarget.placeNode(config);
+      }
+    });
+
+    node.addEventListener("update-node", (ev) => {
+      ev.stopPropagation();
+
+      const config = [...nodes];
+      config[i] = ev.detail.config;
+
+      graph.dispatchEvent(
+        new CustomEvent("update-node", { detail: { config }, bubbles: true })
+      );
+    });
+
+    node.addEventListener("delete-node", (ev) => {
+      ev.stopPropagation();
+
+      const config = [...nodes];
+      config.splice(i, 1);
+
+      graph.dispatchEvent(
+        new CustomEvent("update-node", { detail: { config }, bubbles: true })
+      );
+    });
+
+    node.addEventListener("place-node", (ev) => {
+      ev.stopPropagation();
+
+      const config = [...nodes];
+      config.splice(i, 0, ev.detail.config);
+      console.log(config);
+
+      graph.dispatchEvent(
+        new CustomEvent("update-node", { detail: { config }, bubbles: true })
+      );
+    });
+
+    graph.appendChild(node);
+  }
+
+  return graph;
+}

src/main.js

@@ -1,8 +1,11 @@
-import {demoConfig} from "./demo-config";
+import { demoConfig2 } from "./demo-config";
 import "@vanillawc/wc-codemirror";
 
 import "./script-graph";
-import "./script-graph3";
+// import "./script-graph3";
+import "./hat-graph/hat-graph-node";
+import "./hat-graph/hat-graph";
+import { makeGraph } from "./hat-graph/make-graph";
 
 import { ActionHandler } from "./script-to-graph";
 
@@ -12,18 +15,18 @@ let index_counter = 0;
 let nodes = [];
 
 window.onload = () => {
-
+  return;
-  const graph2 = document.createElement("script-graph3");
+  //const graph2 = document.createElement("script-graph3");
-  document.querySelector("#graph2").appendChild(graph2);
+  //document.querySelector("#graph2").appendChild(graph2);
 
   let src = demoConfig;
 
   const fullcode = document.querySelector("#fullcode");
   fullcode.mode = "yaml";
-  window.setTimeout(()=> fullcode.value = jsyaml.safeDump(src), 100);
+  window.setTimeout(() => (fullcode.value = jsyaml.safeDump(src)), 100);
 
   const updateButton = document.querySelector("#updateButton");
-  updateButton.addEventListener('click', () => {
+  updateButton.addEventListener("click", () => {
     src = jsyaml.safeLoad(fullcode.value);
     index_counter = 0;
     nodes = [];
@@ -43,11 +46,68 @@ window.onload = () => {
     graph.tree = tr.graph;
     const code = document.querySelector("#snippet");
     code.value = jsyaml.safeDump(action);
-    document.querySelector("#saveSnippet").onclick = () => update(jsyaml.safeLoad(code.value));
+    document.querySelector("#saveSnippet").onclick = () =>
-    document.querySelector("#deleteSnippet").onclick = () => update(jsyaml.safeLoad(null));
+      update(jsyaml.safeLoad(code.value));
-  }
+    document.querySelector("#deleteSnippet").onclick = () =>
+      update(jsyaml.safeLoad(null));
+  };
 
   graph.tree = tr.graph;
   document.querySelector("#graph").appendChild(graph);
+};
 
+function nodeSelected(ev) {
+  const code = document.querySelector("#snippet");
+  code.value = jsyaml.safeDump(ev.detail.config);
+  code.currentNode = ev.target;
 }
+
+function rebuildGraph(config) {
+  const graphCard = document.querySelector("#graph");
+
+  while (graphCard.firstChild) graphCard.removeChild(graphCard.firstChild);
+
+  const graph = makeGraph(config);
+  graph.addEventListener("node-selected", nodeSelected);
+  graph.addEventListener("update-node", (ev) => {
+    const code = document.querySelector("#fullcode");
+    code.value = jsyaml.safeDump(ev.detail.config);
+    window.setTimeout(() => rebuildGraph(ev.detail.config), 100);
+  });
+
+  graphCard.appendChild(graph);
+}
+
+function setup_snippet_editor() {
+  document.querySelector("#saveSnippet").onclick = () => {
+    const code = document.querySelector("#snippet");
+    if (code.currentNode) {
+      code.currentNode.updateNode(jsyaml.safeLoad(code.value));
+    }
+  };
+  document.querySelector("#deleteSnippet").onclick = () => {
+    const code = document.querySelector("#snippet");
+    if (code.currentNode) {
+      code.currentNode.deleteNode();
+    }
+  };
+}
+
+function setup() {
+  setup_snippet_editor();
+
+  let src = demoConfig2;
+  const fullcode = document.querySelector("#fullcode");
+  fullcode.mode = "yaml";
+  window.setTimeout(() => (fullcode.value = jsyaml.safeDump(src)), 100);
+
+  rebuildGraph(src);
+
+  const updateButton = document.querySelector("#updateButton");
+  updateButton.addEventListener("click", () => {
+    src = jsyaml.safeLoad(fullcode.value);
+    rebuildGraph(src);
+  });
+}
+
+setup();

src/script-graph3.ts

@@ -4,13 +4,38 @@ import {
   css,
   svg,
   property,
-  TemplateResult
+  TemplateResult,
 } from "lit-element";
 
-import { mdiAsterisk } from "@mdi/js";
+import {
+  mdiCallSplit,
+  mdiAbTesting,
+  mdiCheck,
+  mdiClose,
+  mdiChevronRight,
+  mdiExclamation,
+  mdiTimerOutline,
+  mdiTrafficLight,
+  mdiRefresh,
+  mdiArrowUp,
+  mdiCodeJson,
+  mdiCheckBoxOutline,
+  mdiCheckboxBlankOutline,
+  mdiAsterisk,
+  mdiCircleOutline,
+} from "@mdi/js";
 
-const SIZE = 35;
+const ICONS = {
-const DIST = 20;
+  "call-split": mdiCallSplit,
+  "ab-testing": mdiAbTesting,
+  check: mdiCheck,
+  close: mdiClose,
+  "chevron-right": mdiChevronRight,
+  exclamation: mdiExclamation,
+  asterisk: mdiAsterisk,
+};
+
+const SIZE = 24;
 
 interface GraphNode extends LitElement {
   render_svg(): TemplateResult;
@@ -19,92 +44,255 @@ interface GraphNode extends LitElement{
 }
 
 class ScriptGraphNode extends LitElement {
+  @property() icon = "chevron-right";
 
-  @property() icon = mdiAsterisk;
+  connectedCallback() {
+    super.connectedCallback();
+    if (!this.hasAttribute("tabindex")) this.setAttribute("tabindex", "0");
+  }
 
   get width() {
-    return SIZE;
+    return SIZE + 5;
   }
   get height() {
-    return SIZE + DIST;
+    return SIZE + 5;
   }
-
+  render() {
-  render_svg() {
     return svg`
+    <svg
+      width="${this.width}"
+      height="${this.height}"
+      viewBox="${-this.width / 2} 0 ${this.width} ${this.height}"
+    >
       <circle
         cx="0"
         cy="${this.width / 2}"
         r="${SIZE / 2}"
       />
-      <g style="pointer-events: none" transform="translate(-12, ${this.width/2-12})">
+      <g
-      </g>
+        style="pointer-events: none"
+        transform="translate(${-12} ${this.width / 2 - 12})"
+      >
+        ${
+          ICONS[this.icon]
+            ? svg`
+          <path d="${ICONS[this.icon]}"/>
           `
+            : ""
+        }
+      </g>
+      </svg>
+    `;
   }
 
+  static get styles() {
+    return css`
+      :host {
+        display: flex;
+        --stroke-clr: var(--stroke-color, rgb(3, 169, 244));
+        --hover-clr: var(--hover-color, rgb(255, 152, 0));
+      }
+      circle {
+        stroke: var(--stroke-clr);
+        stroke-width: 2;
+        fill: white;
+      }
+      :host(:hover) {
+        --stroke-clr: var(--hover-clr);
+      }
+      :host(:focus) {
+        --stroke-clr: green;
+        outline: none;
+      }
+    `;
+  }
 }
 
-class ScriptGraph3 extends LitElement {
+class ScriptGraphBranch extends LitElement {
-
+  @property() _num_items = 0;
-  @property() content = [];
+  @property() _branch_height = 30;
-  @property() _width = 0;
+  @property() _branch_curve = 25;
-  @property() _height = 0;
-
-  connectedCallback() {
-    super.connectedCallback();
-    console.log(this.querySelectorAll('*'))
 
+  get width() {
+    let w = 0;
+    for (const c of this.children) {
+      w += (c as any).width ?? 0;
+    }
+    return w;
+  }
+  get height() {
+    let h = 0;
+    for (const c of this.children) {
+      h = Math.max(h, (c as any).height ?? 0);
+    }
+    return h + 2 * this._branch_height;
   }
 
   async updateChildren() {
-    this.content = [];
+    this._num_items = this.children.length;
-    let y = 0;
-    let w = 0;
-    for (const e of this.querySelectorAll('*') as NodeListOf<GraphNode>) {
-      this.content.push({
-        svg: e.render_svg(),
-        offset_y: y,
-      });
-      y += e.height;
-      w = Math.max(w, e.width);
   }
-    this._width = w;
+
-    this._height = y;
+  render() {
-    this.requestUpdate();
+    let branch_x = [];
+    let total = 0;
+    for (const c of Array.from(this.children)) {
+      const rect = c.getBoundingClientRect();
+      branch_x.push(rect.width / 2 + total);
+      total += rect.width;
+    }
+
+    const line_end = this.height - this._branch_height;
+
+    return html`
+      <svg width="${this.width}" height="${this.height}">
+        <rect
+          x="0"
+          y="0"
+          width="${this.width}"
+          height="${this.height}"
+          fill="white"
+        />
+        ${branch_x.map((x) => {
+          return svg`
+              <path
+                class="line"
+                d="
+                  M ${this.width / 2} 0
+                  C ${this.width / 2} ${this._branch_curve}
+                    ${x} ${this._branch_height - this._branch_curve}
+                    ${x} ${this._branch_height}
+                  L ${x} ${line_end}
+                  C ${x} ${line_end + this._branch_curve}
+                    ${this.width / 2} ${this.height - this._branch_curve}
+                    ${this.width / 2} ${this.height}
+                "
+              />
+            `;
+        })}
+      </svg>
+      <script-graph-node id="head" .icon=${"call-split"}> </script-graph-node>
+      <div id="branches" style="top: ${this._branch_height}px;">
+        <slot @slotchange=${this.updateChildren}></slot>
+      </div>
+    `;
+  }
+
+  static get styles() {
+    return css`
+      :host {
+        position: relative;
+        display: flex;
+        --stroke-clr: var(--stroke-color, rgb(3, 169, 244));
+        --hover-clr: var(--hover-color, rgb(255, 152, 0));
+      }
+      #branches {
+        position: absolute;
+        top: 20px;
+        left: 0;
+        display: flex;
+        flex-direction: row;
+        align-items: center;
+      }
+      path.line {
+        stroke: var(--stroke-clr);
+        stroke-width: 2;
+        fill: white;
+      }
+      #head {
+        position: Absolute;
+        top: 5px;
+        left: 50%;
+        transform: translate(-50%, -50%);
+      }
+      :host(:focus-within) #head {
+        --stroke-color: green;
+      }
+    `;
+  }
+}
+
+class ScriptGraph3 extends LitElement {
+  @property() content = [];
+  @property() _width = 0;
+  @property() _height = 0;
+  @property() _distance = 20;
+
+  async updateChildren() {
+    return;
   }
 
   childrenChangedCallback() {
     console.log("Children changed");
   }
 
+  get height() {
+    let h = 0;
+    for (const c of this.children) {
+      h += (c as any).height ?? 0;
+      h += this._distance;
+    }
+    return h + this._distance;
+  }
+
+  get width() {
+    let w = 0;
+    for (const c of this.children) {
+      w = Math.max(w, (c as any).width ?? 0);
+    }
+    return w;
+  }
+
   render() {
-
-
-    let y = 0;
-    let nodes = [];
-    for (const e of this.content) {
-
-    }
-
     return html`
-    <svg width=500 height=500>
+      <svg width="${this.width}" height="${this.height}">
-      ${this.content.map(e =>
+        <rect
-        svg`
+          x="0"
-          <g transform="translate(${this._width/2} ${e.offset_y})">
+          y="0"
-          ${e.svg}
+          width="${this.width}"
-          </g>
+          height="${this.height}"
-        `)}
+          fill="white"
+        />
+        <path
+          class="line"
+          d="
+            M ${this.width / 2} 0
+            L ${this.width / 2} ${this.height}
+          "
+        />
       </svg>
-    <slot
+      <div id="nodes" style="--distance: ${this._distance}px;">
-    @slotchange=${this.updateChildren}
+        <slot @slotchange=${this.updateChildren}></slot>
-    ></slot>
+      </div>
-    <style>
+    `;
-      slot {
-        display: none;
-      }
-      </style>
-    `
   }
 
+  static get styles() {
+    return css`
+      :host {
+        position: relative;
+        display: flex;
+        --stroke-clr: var(--stroke-color, rgb(3, 169, 244));
+        --hover-clr: var(--hover-color, rgb(255, 152, 0));
+      }
+      #nodes {
+        position: absolute;
+        top: var(--distance, 10px);
+        left: 0;
+        display: flex;
+        flex-direction: column;
+        align-items: center;
+      }
+      ::slotted(*) {
+        padding-bottom: var(--distance, 10px);
+      }
+      path.line {
+        stroke: var(--stroke-clr);
+        stroke-width: 2;
+        fill: white;
+      }
+    `;
+  }
 }
 customElements.define("script-graph3", ScriptGraph3);
 customElements.define("script-graph-node", ScriptGraphNode);
+customElements.define("script-graph-branch", ScriptGraphBranch);

tsconfig.json

@@ -1,18 +1,9 @@
 {
   "compilerOptions": {
-    "target": "es6",
+    "target": "es2017",
-    "module": "ESNext",
     "moduleResolution": "node",
-    "sourceMap": true,
+    "resolveJsonModule": true,
-    "emitDecoratorMetadata": true,
+    "allowSyntheticDefaultImports": true,
-    "experimentalDecorators": true,
+    "experimentalDecorators": true
-    "removeComments": false,
+  }
-    "noImplicitAny": false
-  },
-  "include": [
-    "src/**/*.ts"
-  ],
-  "exclude": [
-    "node_modules"
-  ]
 }