wip

README.md

@@ -1 +1 @@
-# tp-element
+# tp-flow-nodes

connections.js

@@ -0,0 +1,183 @@
+import { html, css, svg } from 'lit';
+
+export const connectionStyles = css`
+  .connections {
+    pointer-events: none;
+  }
+
+  .connections path {
+    transition: stroke 0.3s ease, stroke-width 0.3s ease;
+  }
+
+  .connections path:hover {
+    stroke: #999;
+    stroke-width: 3;
+  }
+`;
+
+export const connections = function(superClass) {
+  return class extends superClass {
+    constructor() {
+      super();
+      this.connections = [];
+      this.draggingConnection = null;
+      this.mousePosition = { x: 0, y: 0 };
+    }
+
+    firstUpdated() {
+      this.addEventListener('port-click', this._handlePortClick);
+      document.addEventListener('mousemove', this._updatePreviewConnection.bind(this));
+      super.firstUpdated();
+    }
+
+    _updatePreviewConnection(e) {
+      if (this.draggingConnection) {
+        this.mousePosition = {
+          x: e.clientX,
+          y: e.clientY
+        };
+        this.requestUpdate();
+      }
+    }
+
+    _renderConnections() {
+      return html`
+        <svg class="connections" style="position: absolute; top: 0; left: 0; width: 100%; height: 100%; pointer-events: none;">
+          ${this.connections.map(conn => this._renderConnection(conn))}
+          ${this.draggingConnection ? this._renderPreviewConnection() : null}
+        </svg>
+      `;
+    }
+
+    _renderPreviewConnection() {
+      const sourceNode = this.nodes.find(node => node.id === this.draggingConnection.sourceNodeId);
+      if (!sourceNode) return '';
+
+      const sourcePort = sourceNode.shadowRoot.querySelector(
+        `.output-ports [data-port-id="${this.draggingConnection.sourcePortId}"]`
+      );
+      if (!sourcePort) return '';
+
+      const sourceRect = sourcePort.getBoundingClientRect();
+      const canvasRect = this.canvas.getBoundingClientRect();
+
+      const start = {
+        x: sourceRect.left + sourceRect.width/2 - canvasRect.left,
+        y: sourceRect.top + sourceRect.height/2 - canvasRect.top
+      };
+      
+      const end = {
+        x: this.mousePosition.x - canvasRect.left,
+        y: this.mousePosition.y - canvasRect.top
+      };
+
+      const controlPoint1 = {
+        x: start.x + Math.min(100, Math.abs(end.x - start.x) / 2),
+        y: start.y
+      };
+      
+      const controlPoint2 = {
+        x: end.x - Math.min(100, Math.abs(end.x - start.x) / 2),
+        y: end.y
+      };
+
+      const path = `M${start.x},${start.y} C${controlPoint1.x},${controlPoint1.y} ${controlPoint2.x},${controlPoint2.y} ${end.x},${end.y}`;
+
+      return svg`
+        <path 
+          d="${path}"
+          fill="none"
+          stroke="#666"
+          stroke-width="2"
+          stroke-dasharray="5,5"
+          id="preview-connection"
+        />
+      `;
+    }
+
+    _renderConnection(conn) {
+      const sourceNode = this.nodes.find(node => node.id === conn.sourceNodeId);
+      const targetNode = this.nodes.find(node => node.id === conn.targetNodeId);
+      
+      if (!sourceNode || !targetNode) return '';
+
+      const sourcePort = sourceNode.shadowRoot.querySelector(`.output-ports [data-port-id="${conn.sourcePortId}"]`);
+      const targetPort = targetNode.shadowRoot.querySelector(`.input-ports [data-port-id="${conn.targetPortId}"]`);
+      
+      if (!sourcePort || !targetPort) return '';
+
+      const sourceRect = sourcePort.getBoundingClientRect();
+      const targetRect = targetPort.getBoundingClientRect();
+      const canvasRect = this.canvas.getBoundingClientRect();
+
+      const start = {
+        x: sourceRect.left + sourceRect.width/2 - canvasRect.left,
+        y: sourceRect.top + sourceRect.height/2 - canvasRect.top
+      };
+      
+      const end = {
+        x: targetRect.left + targetRect.width/2 - canvasRect.left,
+        y: targetRect.top + targetRect.height/2 - canvasRect.top
+      };
+
+      const controlPoint1 = {
+        x: start.x + Math.min(100, Math.abs(end.x - start.x) / 2),
+        y: start.y
+      };
+      
+      const controlPoint2 = {
+        x: end.x - Math.min(100, Math.abs(end.x - start.x) / 2),
+        y: end.y
+      };
+
+      const path = `M${start.x},${start.y} C${controlPoint1.x},${controlPoint1.y} ${controlPoint2.x},${controlPoint2.y} ${end.x},${end.y}`;
+
+      return svg`
+        <path 
+          d="${path}"
+          fill="none"
+          stroke="#666"
+          stroke-width="2"
+          id="${conn.id}"
+        />
+      `;
+    }
+
+    _handlePortClick(e) {
+      const { nodeId, portType, portId, portName } = e.detail;
+      
+      if (!this.draggingConnection) {
+        if (portType === 'output') {
+          this.draggingConnection = {
+            sourceNodeId: nodeId,
+            sourcePortId: portId,
+            sourcePortType: portType
+          };
+        }
+      } else {
+        if (portType === 'input' && nodeId !== this.draggingConnection.sourceNodeId) {
+          const connectionExists = this.connections.some(conn => 
+            conn.sourceNodeId === this.draggingConnection.sourceNodeId && 
+            conn.sourcePortId === this.draggingConnection.sourcePortId &&
+            conn.targetNodeId === nodeId &&
+            conn.targetPortId === portId
+          );
+
+          if (!connectionExists) {
+            const connection = {
+              id: `conn_${Date.now()}`,
+              sourceNodeId: this.draggingConnection.sourceNodeId,
+              sourcePortId: this.draggingConnection.sourcePortId,
+              targetNodeId: nodeId,
+              targetPortId: portId
+            };
+            
+            this.connections = [...this.connections, connection];
+          }
+        }
+        this.draggingConnection = null;
+        this.requestUpdate();
+      }
+    }
+  };
+}

demo-node.js

@@ -0,0 +1,56 @@
+/**
+@license
+Copyright (c) 2024 trading_peter
+This program is available under Apache License Version 2.0
+*/
+
+import { html, css } from 'lit';
+import { TpFlowNode } from './tp-flow-node';
+
+class DemoNode extends TpFlowNode {
+  static get styles() {
+    return [
+      ...super.styles,
+      css`
+        :host {
+          display: block;
+        }
+      `
+    ];
+  }
+
+  renderNodeContent() {
+    return html`
+      <select @change="${this._handleOperationChange}">
+        <option value="add">Add</option>
+        <option value="subtract">Subtract</option>
+      </select>
+    `;
+  }
+
+  static get properties() {
+    return { };
+  }
+
+  constructor() {
+    super();
+
+    this.flowNodeType = 'MathNode';
+    this.inputs = [
+      { name: 'value1' },
+      { name: 'value2' }
+    ];
+    this.outputs = [
+      { name: 'result' }
+    ];
+    this.data = {
+      operation: 'add'
+    };
+  }
+
+  _handleOperationChange(e) {
+    this.data.operation = e.target.value;
+  }
+}
+
+window.customElements.define('demo-node', DemoNode);

package.json

@@ -1,14 +1,14 @@
 {
-  "name": "@tp/tp-element",
+  "name": "@tp/tp-flow-nodes",
-  "version": "0.0.1",
+  "version": "1.0.0",
   "description": "",
-  "main": "tp-element.js",
+  "main": "tp-flow-nodes.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "repository": {
     "type": "git",
-    "url": "https://gitea.codeblob.work/tp-elements/tp-element.git"
+    "url": "https://gitea.codeblob.work/tp-elements/tp-flow-nodes.git"
   },
   "author": "trading_peter",
   "license": "Apache-2.0",

panning.js

@@ -0,0 +1,98 @@
+import { TpFlowNode } from './tp-flow-node.js';
+
+export const panning = function(superClass) {
+  return class extends superClass {
+    static get properties() {
+      return {
+        isDragging: { type: Boolean },
+        currentX: { type: Number },
+        currentY: { type: Number },
+        initialX: { type: Number },
+        initialY: { type: Number },
+        xOffset: { type: Number },
+        yOffset: { type: Number },
+        highestZIndex: { type: Number }
+      };
+    }
+
+    constructor() {
+      super();
+      this.isDragging = false;
+      this.currentX = 0;
+      this.currentY = 0;
+      this.initialX = 0;
+      this.initialY = 0;
+      this.xOffset = 0;
+      this.yOffset = 0;
+      this.targetElement = null;
+      this.highestZIndex = 1;
+    }
+
+    firstUpdated() {
+      super.firstUpdated();
+      this.canvas = this.shadowRoot.querySelector('.canvas');
+      this.addEventListener('mousedown', this._startDrag.bind(this));
+      document.addEventListener('mousemove', this._drag.bind(this));
+      document.addEventListener('mouseup', this._endDrag.bind(this));
+    }
+
+    _getTopNodeAtPoint(x, y) {
+      const nodes = this.shadowRoot.elementsFromPoint(x, y)
+        .filter(el => el instanceof TpFlowNode)
+        .sort((a, b) => {
+          const aZ = parseInt(getComputedStyle(a).zIndex) || 0;
+          const bZ = parseInt(getComputedStyle(b).zIndex) || 0;
+          return bZ - aZ;
+        });
+      
+      return nodes[0] || null;
+    }
+
+    _bringToFront(element) {
+      if (!(element instanceof TpFlowNode)) return;
+      
+      this.highestZIndex++;
+      element.style.zIndex = this.highestZIndex;
+    }
+
+    _startDrag(e) {
+      const topNode = this._getTopNodeAtPoint(e.clientX, e.clientY);
+      
+      if (topNode) {
+        this.targetElement = topNode;
+        this._bringToFront(topNode);
+      } else {
+        this.targetElement = this.canvas;
+      }
+    
+      if (this.targetElement) {
+        this.isDragging = true;
+        
+        const transform = window.getComputedStyle(this.targetElement).transform;
+        const matrix = new DOMMatrix(transform);
+        this.xOffset = matrix.m41;
+        this.yOffset = matrix.m42;
+        
+        this.initialX = e.clientX - this.xOffset;
+        this.initialY = e.clientY - this.yOffset;
+      }
+    }
+
+    _drag(e) {
+      if (this.isDragging && this.targetElement) {
+        e.preventDefault();
+        
+        this.currentX = e.clientX - this.initialX;
+        this.currentY = e.clientY - this.initialY;
+
+        this.targetElement.style.transform = 
+          `translate(${this.currentX}px, ${this.currentY}px)`;
+      }
+    }
+
+    _endDrag() {
+      this.isDragging = false;
+      this.targetElement = null;
+    }
+  };
+};

tp-element.js

@@ -1,35 +0,0 @@
-/**
-@license
-Copyright (c) 2024 trading_peter
-This program is available under Apache License Version 2.0
-*/
-
-import { LitElement, html, css } from 'lit';
-
-class TpElement extends LitElement {
-  static get styles() {
-    return [
-      css`
-        :host {
-          display: block;
-        }
-      `
-    ];
-  }
-
-  render() {
-    const { } = this;
-
-    return html`
-
-    `;
-  }
-
-  static get properties() {
-    return { };
-  }
-
-
-}
-
-window.customElements.define('tp-element', TpElement);

tp-flow-node.js

@@ -0,0 +1,168 @@
+/**
+@license
+Copyright (c) 2024 trading_peter
+This program is available under Apache License Version 2.0
+*/
+
+import { LitElement, html, css } from 'lit';
+
+// tp-flow-node.js
+export class TpFlowNode extends LitElement {
+  static get styles() {
+    return [
+      css`
+        :host {
+          display: block;
+          position: absolute;
+          background: #2b2b2b;
+          border-radius: 4px;
+          color: #fff;
+          min-width: 150px;
+        }
+
+        .node-header {
+          padding: 8px;
+          background: #3b3b3b;
+          border-bottom: 1px solid #4b4b4b;
+          border-radius: 4px 4px 0 0;
+        }
+
+        .node-body {
+          display: grid;
+          grid-template-columns: 20px 1fr 20px;
+        }
+
+        .node-content {
+          padding: 20px;
+        }
+
+        .node-ports {
+          justify-content: space-between;
+          padding: 8px;
+        }
+
+        .input-ports, .output-ports {
+          display: flex;
+          flex-direction: column;
+          gap: 8px;
+          align-items: flex-start;
+          justify-content: space-evenly;
+        }
+
+        .output-ports {
+          align-items: flex-end;
+        }
+
+        .port {
+          width: 12px;
+          height: 12px;
+          background: #666;
+          border-radius: 50%;
+          cursor: pointer;
+        }
+
+        .port:hover {
+          background: #888;
+        }
+      `
+    ];
+  }
+
+  render() {
+    return html`
+      <div class="node-header">
+        <slot name="title">${this.flowNodeType}</slot>
+      </div>
+      <div class="node-body">
+        <div class="input-ports">
+          ${this.inputs.map((input, idx) => html`
+            <div class="port" 
+                 data-port-type="input"
+                 data-port-id="${idx}"
+                 data-port-name="${input.name}"
+                 @mousedown="${this._handlePortClick}">
+            </div>
+          `)}
+        </div>
+
+        <div class="node-content">
+          ${this.renderNodeContent()}
+        </div>
+
+        <div class="output-ports">
+          ${this.outputs.map((output, idx) => html`
+            <div class="port"
+                 data-port-type="output"
+                 data-port-id="${idx}"
+                 data-port-name="${output.name}"
+                 @mousedown="${this._handlePortClick}">
+            </div>
+          `)}
+        </div>
+      </div>
+    `;
+  }
+
+  renderNodeContent() {
+    console.warn('Your node should override the renderNodeContent method.');
+    return null;
+  }
+
+  static get properties() {
+    return {
+      flowNodeType: { type: String },
+      inputs: { type: Array },
+      outputs: { type: Array },
+      x: { type: Number },
+      y: { type: Number },
+      data: { type: Object }
+    };
+  }
+
+  constructor() {
+    super();
+    this.flowNodeType = 'BaseNode';
+    this.inputs = [];
+    this.outputs = [];
+    this.x = 0;
+    this.y = 0;
+    this.data = {};
+  }
+
+  _handlePortClick(e) {
+    e.stopPropagation();  // Prevents the event from getting caught by the panning action.
+
+    const portEl = e.target;
+    const detail = {
+      nodeId: this.id,
+      portType: portEl.dataset.portType,
+      portId: portEl.dataset.portId,
+      portName: portEl.dataset.portName
+    };
+    
+    this.dispatchEvent(new CustomEvent('port-click', {
+      detail,
+      bubbles: true,
+      composed: true
+    }));
+  }
+
+  // Method to export node data
+  exportData() {
+    return {
+      id: this.id,
+      type: this.flowNodeType,
+      x: this.x,
+      y: this.y,
+      data: this.data
+    };
+  }
+
+  // Method to import node data
+  importData(data) {
+    this.id = data.id;
+    this.x = data.x;
+    this.y = data.y;
+    this.data = data.data;
+  }
+}

tp-flow-nodes.js

@@ -0,0 +1,82 @@
+/**
+@license
+Copyright (c) 2024 trading_peter
+This program is available under Apache License Version 2.0
+*/
+
+import { LitElement, html, css } from 'lit';
+import { connections, connectionStyles } from './connections.js';
+import { panning } from './panning.js';
+
+class TpFlowNodes extends panning(connections(LitElement)) {
+  static get styles() {
+    return [
+      connectionStyles,
+      css`
+        :host {
+          display: block;
+          overflow: hidden;
+          position: relative;
+        }
+
+        .canvas {
+          width: 100%;
+          height: 100%;
+          user-select: none;
+          position: relative;
+          overflow: hidden;
+          transform: translate(0px, 0px);
+        }
+      `
+    ];
+  }
+
+  render() {
+    return html`
+      <div class="canvas">
+        ${this.nodes.map(node => html`${node}`)}
+        ${this._renderConnections()}
+      </div>
+    `;
+  }
+
+  static get properties() {
+    return {
+      nodes: { type: Array },
+      connections: { type: Array }
+    };
+  }
+
+  constructor() {
+    super();
+    this.nodes = [];
+    this.previewConnection = null;
+  }
+
+  // Export flow chart data
+  exportFlow() {
+    return {
+      nodes: this.nodes.map(node => node.exportData()),
+      connections: this.connections
+    };
+  }
+
+  // Import flow chart data
+  importFlow(flowData) {
+    // Clear existing
+    this.nodes = [];
+    this.connections = [];
+    
+    // Create nodes
+    flowData.nodes.forEach(nodeData => {
+      const node = this._createNode(nodeData.type);
+      node.importData(nodeData);
+      this.nodes.push(node);
+    });
+
+    // Restore connections
+    this.connections = flowData.connections;
+  }
+}
+
+window.customElements.define('tp-flow-nodes', TpFlowNodes);