refactor: rename state.svelte.ts to graph-state.svelte.ts

app/src/lib/graph-interface/graph-state.svelte.ts

@@ -0,0 +1,312 @@
+import type { NodeInstance, Socket } from "@nodarium/types";
+import { getContext, setContext } from "svelte";
+import { SvelteSet } from "svelte/reactivity";
+import type { GraphManager } from "./graph-manager.svelte";
+import type { OrthographicCamera } from "three";
+
+
+const graphStateKey = Symbol("graph-state");
+export function getGraphState() {
+  return getContext<GraphState>(graphStateKey);
+}
+export function setGraphState(graphState: GraphState) {
+  return setContext(graphStateKey, graphState)
+}
+
+const graphManagerKey = Symbol("graph-manager");
+export function getGraphManager() {
+  return getContext<GraphManager>(graphManagerKey)
+}
+
+export function setGraphManager(manager: GraphManager) {
+  return setContext(graphManagerKey, manager);
+}
+
+export class GraphState {
+
+  constructor(private graph: GraphManager) {
+    $effect.root(() => {
+      $effect(() => {
+        localStorage.setItem("cameraPosition", `[${this.cameraPosition[0]},${this.cameraPosition[1]},${this.cameraPosition[2]}]`)
+      })
+    })
+    const storedPosition = localStorage.getItem("cameraPosition")
+    if (storedPosition) {
+      try {
+        const d = JSON.parse(storedPosition);
+        this.cameraPosition[0] = d[0];
+        this.cameraPosition[1] = d[1];
+        this.cameraPosition[2] = d[2];
+      } catch (e) {
+        console.log("Failed to parsed stored camera position", e);
+      }
+    }
+  }
+
+  width = $state(100);
+  height = $state(100);
+
+  wrapper = $state<HTMLDivElement>(null!);
+  rect: DOMRect = $derived(
+    (this.wrapper && this.width && this.height) ? this.wrapper.getBoundingClientRect() : new DOMRect(0, 0, 0, 0),
+  );
+
+  camera = $state<OrthographicCamera>(null!);
+  cameraPosition: [number, number, number] = $state([0, 0, 4]);
+
+  clipboard: null | {
+    nodes: NodeInstance[];
+    edges: [number, number, number, string][];
+  } = null;
+
+  cameraBounds = $derived([
+    this.cameraPosition[0] - this.width / this.cameraPosition[2] / 2,
+    this.cameraPosition[0] + this.width / this.cameraPosition[2] / 2,
+    this.cameraPosition[1] - this.height / this.cameraPosition[2] / 2,
+    this.cameraPosition[1] + this.height / this.cameraPosition[2] / 2,
+  ]);
+
+  boxSelection = $state(false);
+  edgeEndPosition = $state<[number, number] | null>();
+  addMenuPosition = $state<[number, number] | null>(null);
+
+  snapToGrid = $state(false);
+  showGrid = $state(true)
+  showHelp = $state(false)
+
+  cameraDown = [0, 0];
+  mouseDownNodeId = -1;
+
+  isPanning = $state(false);
+  isDragging = $state(false);
+  hoveredNodeId = $state(-1);
+  mousePosition = $state([0, 0]);
+  mouseDown = $state<[number, number] | null>(null);
+  activeNodeId = $state(-1);
+  selectedNodes = new SvelteSet<number>();
+  activeSocket = $state<Socket | null>(null);
+  hoveredSocket = $state<Socket | null>(null);
+  possibleSockets = $state<Socket[]>([]);
+  possibleSocketIds = $derived(
+    new Set(this.possibleSockets.map((s) => `${s.node.id}-${s.index}`)),
+  );
+
+  clearSelection() {
+    this.selectedNodes.clear();
+  }
+
+  isBodyFocused = () => document?.activeElement?.nodeName !== "INPUT";
+
+  updateNodePosition(node: NodeInstance) {
+    if (
+      node.state.x === node.position[0] &&
+      node.state.y === node.position[1]
+    ) {
+      delete node.state.x;
+      delete node.state.y;
+    }
+
+    if (node.state["x"] !== undefined && node.state["y"] !== undefined) {
+      if (node.state.ref) {
+        node.state.ref.style.setProperty("--nx", `${node.state.x * 10}px`);
+        node.state.ref.style.setProperty("--ny", `${node.state.y * 10}px`);
+      }
+    } else {
+      if (node.state.ref) {
+        node.state.ref.style.setProperty("--nx", `${node.position[0] * 10}px`);
+        node.state.ref.style.setProperty("--ny", `${node.position[1] * 10}px`);
+      }
+    }
+  }
+
+  getSnapLevel() {
+    const z = this.cameraPosition[2];
+    if (z > 66) {
+      return 8;
+    } else if (z > 55) {
+      return 4;
+    } else if (z > 11) {
+      return 2;
+    } else {
+    }
+    return 1;
+  }
+
+  getSocketPosition(
+    node: NodeInstance,
+    index: string | number,
+  ): [number, number] {
+    if (typeof index === "number") {
+      return [
+        (node?.state?.x ?? node.position[0]) + 20,
+        (node?.state?.y ?? node.position[1]) + 2.5 + 10 * index,
+      ];
+    } else {
+      const _index = Object.keys(node.state?.type?.inputs || {}).indexOf(index);
+      return [
+        node?.state?.x ?? node.position[0],
+        (node?.state?.y ?? node.position[1]) + 10 + 10 * _index,
+      ];
+    }
+  }
+
+  private nodeHeightCache: Record<string, number> = {};
+  getNodeHeight(nodeTypeId: string) {
+    if (nodeTypeId in this.nodeHeightCache) {
+      return this.nodeHeightCache[nodeTypeId];
+    }
+    const node = this.graph.getNodeType(nodeTypeId);
+    if (!node?.inputs) {
+      return 5;
+    }
+    const height =
+      5 +
+      10 *
+      Object.keys(node.inputs).filter(
+        (p) =>
+          p !== "seed" &&
+          node?.inputs &&
+          !("setting" in node?.inputs?.[p]) &&
+          node.inputs[p].hidden !== true,
+      ).length;
+    this.nodeHeightCache[nodeTypeId] = height;
+    return height;
+  }
+
+  copyNodes() {
+    if (this.activeNodeId === -1 && !this.selectedNodes?.size)
+      return;
+    let nodes = [
+      this.activeNodeId,
+      ...(this.selectedNodes?.values() || []),
+    ]
+      .map((id) => this.graph.getNode(id))
+      .filter(b => !!b);
+
+    const edges = this.graph.getEdgesBetweenNodes(nodes);
+    nodes = nodes.map((node) => ({
+      ...node,
+      position: [
+        this.mousePosition[0] - node.position[0],
+        this.mousePosition[1] - node.position[1],
+      ],
+      tmp: undefined,
+    }));
+
+    this.clipboard = {
+      nodes: nodes,
+      edges: edges,
+    };
+  }
+
+  pasteNodes() {
+    if (!this.clipboard) return;
+
+    const nodes = this.clipboard.nodes
+      .map((node) => {
+        node.position[0] = this.mousePosition[0] - node.position[0];
+        node.position[1] = this.mousePosition[1] - node.position[1];
+        return node;
+      })
+      .filter(Boolean) as NodeInstance[];
+
+    const newNodes = this.graph.createGraph(nodes, this.clipboard.edges);
+    this.selectedNodes.clear();
+    for (const node of newNodes) {
+      this.selectedNodes.add(node.id);
+    }
+  }
+
+
+  setDownSocket(socket: Socket) {
+    this.activeSocket = socket;
+
+    let { node, index, position } = socket;
+
+    // remove existing edge
+    if (typeof index === "string") {
+      const edges = this.graph.getEdgesToNode(node);
+      for (const edge of edges) {
+        if (edge[3] === index) {
+          node = edge[0];
+          index = edge[1];
+          position = this.getSocketPosition(node, index);
+          this.graph.removeEdge(edge);
+          break;
+        }
+      }
+    }
+
+    this.mouseDown = position;
+    this.activeSocket = {
+      node,
+      index,
+      position,
+    };
+
+    this.possibleSockets = this.graph
+      .getPossibleSockets(this.activeSocket)
+      .map(([node, index]) => {
+        return {
+          node,
+          index,
+          position: this.getSocketPosition(node, index),
+        };
+      });
+  };
+
+
+  projectScreenToWorld(x: number, y: number): [number, number] {
+    return [
+      this.cameraPosition[0] +
+      (x - this.width / 2) / this.cameraPosition[2],
+      this.cameraPosition[1] +
+      (y - this.height / 2) / this.cameraPosition[2],
+    ];
+  }
+
+  getNodeIdFromEvent(event: MouseEvent) {
+    let clickedNodeId = -1;
+
+    let mx = event.clientX - this.rect.x;
+    let my = event.clientY - this.rect.y;
+
+    if (event.button === 0) {
+      // check if the clicked element is a node
+      if (event.target instanceof HTMLElement) {
+        const nodeElement = event.target.closest(".node");
+        const nodeId = nodeElement?.getAttribute?.("data-node-id");
+        if (nodeId) {
+          clickedNodeId = parseInt(nodeId, 10);
+        }
+      }
+
+      // if we do not have an active node,
+      // we are going to check if we clicked on a node by coordinates
+      if (clickedNodeId === -1) {
+        const [downX, downY] = this.projectScreenToWorld(mx, my);
+        for (const node of this.graph.nodes.values()) {
+          const x = node.position[0];
+          const y = node.position[1];
+          const height = this.getNodeHeight(node.type);
+          if (downX > x && downX < x + 20 && downY > y && downY < y + height) {
+            clickedNodeId = node.id;
+            break;
+          }
+        }
+      }
+    }
+    return clickedNodeId;
+  }
+
+  isNodeInView(node: NodeInstance) {
+    const height = this.getNodeHeight(node.type);
+    const width = 20;
+    return (
+      node.position[0] > this.cameraBounds[0] - width &&
+      node.position[0] < this.cameraBounds[1] &&
+      node.position[1] > this.cameraBounds[2] - height &&
+      node.position[1] < this.cameraBounds[3]
+    );
+  };
+}