9 files changed, 135 insertions, 294 deletions

diff --git a/web/src/components/app/index.ts b/web/src/components/app/index.ts
index 195011f..c30249f 100644
--- a/web/src/components/app/index.ts
+++ b/web/src/components/app/index.ts
@@ -1,4 +1,5 @@
 import defaultDoc from "../../defaultDoc";
+import NotiveElement, { customElement } from "../../element";
 import { Selection } from "../../selection";
 import { Doc } from "../../types";
 import ntvGrid, { NotiveGridElement } from "../grid";
@@ -6,7 +7,8 @@ import renderGrid from "../grid/renderGrid";
 import ntvToolbar from "../toolbar";
 import "./index.css";
 
-export class NotiveAppElement extends HTMLElement {
+@customElement("ntv-app")
+export class NotiveAppElement extends NotiveElement {
   doc: Doc = defaultDoc();
   #selection?: Selection;
 
@@ -37,10 +39,11 @@ export class NotiveAppElement extends HTMLElement {
           ongridselectionchange: (event) => {
             this.selection = event.selection;
           },
+          oncellchange: (event) => {
+            console.log(event);
+          },
         }),
       ),
     );
   }
 }
-
-customElements.define("ntv-app", NotiveAppElement);
diff --git a/web/src/components/grid/index.css b/web/src/components/grid/index.css
index 64153ed..c29f55d 100644
--- a/web/src/components/grid/index.css
+++ b/web/src/components/grid/index.css
@@ -33,7 +33,7 @@
     display: none;
   }
 
-  ntv-grid input[data-edit-cell] {
+  ntv-grid input[data-edit] {
     position: absolute;
     vertical-align: baseline;
     background: var(--color-neutral-800);
@@ -43,7 +43,7 @@
     text-align: center;
   }
 
-  ntv-grid input[data-edit-cell]:focus-visible {
+  ntv-grid input[data-edit]:focus-visible {
     outline: none;
   }
 }
diff --git a/web/src/components/grid/index.ts b/web/src/components/grid/index.ts
index 2c00eb8..6c7f735 100644
--- a/web/src/components/grid/index.ts
+++ b/web/src/components/grid/index.ts
@@ -1,4 +1,5 @@
-import h, { type CreateElement } from "../../html";
+import NotiveElement, { customElement, eventHandler } from "../../element";
+import h from "../../html";
 import { ActiveCellSelection, Selection } from "../../selection";
 import { CellRef } from "../../types";
 import cellAtCoord from "./cellAtCoord";
@@ -7,7 +8,8 @@ import drawSelection, { SelectionStyles } from "./drawSelection";
 import "./index.css";
 import { getRenderedCell, RenderedGrid } from "./renderGrid";
 
-export class NotiveGridElement extends HTMLElement {
+@customElement("ntv-grid")
+export class NotiveGridElement extends NotiveElement {
   #internals: ElementInternals = this.attachInternals();
 
   grid?: RenderedGrid;
@@ -23,28 +25,11 @@ export class NotiveGridElement extends HTMLElement {
     this.drawSelection();
   }
 
-  #ongridselectionchange?: ((event: GridSelectionEvent) => any) | undefined;
+  @eventHandler("ntv:grid:selectionchange")
+  ongridselectionchange?: (event: GridSelectionEvent) => any;
 
-  get ongridselectionchange() {
-    return this.#ongridselectionchange;
-  }
-
-  set ongridselectionchange(
-    handler: ((event: GridSelectionEvent) => any) | undefined,
-  ) {
-    if (this.#ongridselectionchange) {
-      this.removeEventListener(
-        "ntv:grid:selectionchange",
-        this.#ongridselectionchange,
-      );
-    }
-
-    this.#ongridselectionchange = handler;
-
-    if (handler) {
-      this.addEventListener("ntv:grid:selectionchange", handler);
-    }
-  }
+  @eventHandler("ntv:grid:cellchange")
+  oncellchange?: (event: GridCellChangeEvent) => any;
 
   canvas: HTMLCanvasElement = h.canvas({
     onmousedown: (event) => {
@@ -53,6 +38,12 @@ export class NotiveGridElement extends HTMLElement {
       if (!cellRef) return;
       this.startSelecting(cellRef);
     },
+    ondblclick: (event) => {
+      if (!this.grid) return;
+      const cellRef = this.#mouseEventCellRef(event);
+      if (!cellRef) return;
+      this.startEditing(cellRef);
+    },
   });
 
   selectionCanvas: HTMLCanvasElement = h.canvas({
@@ -188,11 +179,9 @@ export class NotiveGridElement extends HTMLElement {
 
   #editingCellRef?: CellRef;
 
-  #editInputEl: HTMLInputElement = h.input({
-    dataset: { editCell: "true" },
-    onblur: () => {
-      this.#finishEditing();
-    },
+  #editInput: HTMLInputElement = h.input({
+    dataset: { edit: "true" },
+    onblur: () => this.#finishEditing(),
     onkeydown: (event) => {
       switch (event.key) {
         case "Enter":
@@ -206,50 +195,45 @@ export class NotiveGridElement extends HTMLElement {
     },
   });
 
-  #canvasDoubleClickCallback(this: NotiveGridElement, event: MouseEvent) {
+  startEditing(cellRef: CellRef) {
     if (!this.grid) return;
 
-    const cellRef = this.#mouseEventCellRef(event);
-
-    if (!cellRef) return;
-
     const cell = getRenderedCell(this.grid, cellRef);
 
     if (!cell) return;
 
     this.#editingCellRef = cellRef;
 
-    this.append(this.#editInputEl);
+    this.append(this.#editInput);
 
-    this.#editInputEl.value = cell.value || "";
-    this.#editInputEl.style.left = cell.rect.topLeft.x + 2 + "px";
-    this.#editInputEl.style.top = cell.rect.topLeft.y + 2 + "px";
-    this.#editInputEl.style.width = cell.rect.width - 3 + "px";
-    this.#editInputEl.style.height = cell.rect.height - 3 + "px";
-    this.#editInputEl.focus();
+    this.#editInput.value = cell.value || "";
+
+    Object.assign(this.#editInput.style, {
+      left: cell.rect.topLeft.x + 2 + "px",
+      top: cell.rect.topLeft.y + 2 + "px",
+      width: cell.rect.width - 3 + "px",
+      height: cell.rect.height - 3 + "px",
+    });
+
+    this.#editInput.focus();
   }
 
   #cancelEditing() {
-    this.#editInputEl.remove();
+    this.#editInput.remove();
   }
 
   #finishEditing() {
-    this.#editInputEl.remove();
+    this.#editInput.remove();
 
-    if (!this.grid) return;
+    if (!this.grid || !this.#editingCellRef) return;
 
-    window.notive.setCellValue(
-      this.grid.id,
-      this.#editingCellRef!,
-      this.#editInputEl.value,
+    this.dispatchEvent(
+      new GridCellChangeEvent(this.#editingCellRef, this.#editInput.value),
     );
   }
 }
 
-customElements.define("ntv-grid", NotiveGridElement);
-
-export default ((...args: any[]): NotiveGridElement =>
-  (h as any)["ntv-grid"](...args)) as CreateElement<NotiveGridElement>;
+export default NotiveGridElement.makeFactory();
 
 export class GridSelectionEvent extends Event {
   selection: Selection;
@@ -260,8 +244,21 @@ export class GridSelectionEvent extends Event {
   }
 }
 
+export class GridCellChangeEvent extends Event {
+  cellRef: CellRef;
+  value?: string;
+
+  constructor(cellRef: CellRef, value: string | undefined) {
+    super("ntv:grid:cellchange");
+
+    this.cellRef = cellRef;
+    this.value = value;
+  }
+}
+
 declare global {
   interface HTMLElementEventMap {
     "ntv:grid:selectionchange": GridSelectionEvent;
+    "ntv:grid:cellchange": GridCellChangeEvent;
   }
 }
diff --git a/web/src/components/toolbar/index.ts b/web/src/components/toolbar/index.ts
index 1400174..84f6a65 100644
--- a/web/src/components/toolbar/index.ts
+++ b/web/src/components/toolbar/index.ts
@@ -1,6 +1,6 @@
+import NotiveElement, { customElement } from "../../element";
 import h, { CreateElement } from "../../html";
 import { ActiveCellSelection, RangeSelection } from "../../selection";
-import { RenderedGrid } from "../grid/renderGrid";
 import "./index.css";
 
 function getSelectedSubdivisionsCount(): number | undefined {
@@ -23,7 +23,8 @@ function getSelectedSubdivisionsCount(): number | undefined {
   return Math.min(...selectedCells.map((cells) => cells.length));
 }
 
-class NotiveToolbarElement extends HTMLElement {
+@customElement("ntv-toolbar")
+class NotiveToolbarElement extends NotiveElement {
   #subdivisionsInputEl: HTMLInputElement = h.input({
     title: "Subdivisions",
     placeholder: "-",
@@ -127,7 +128,4 @@ class NotiveToolbarElement extends HTMLElement {
   }
 }
 
-customElements.define("ntv-toolbar", NotiveToolbarElement);
-
-export default ((...args: any[]): NotiveToolbarElement =>
-  (h as any)["ntv-toolbar"](...args)) as CreateElement<NotiveToolbarElement>;
+export default NotiveToolbarElement.makeFactory();
diff --git a/web/src/element.ts b/web/src/element.ts
new file mode 100644
index 0000000..6299d2f
--- /dev/null
+++ b/web/src/element.ts
@@ -0,0 +1,45 @@
+import { createElement, type CreateElement } from "./html";
+
+export default class NotiveElement extends HTMLElement {
+  static makeFactory<T extends NotiveElement>(this: {
+    new (): T;
+  }): CreateElement<T>;
+
+  static makeFactory(): any {
+    throw new Error(
+      "Missing makeFactory implementation. Did you forget to use @customElement?",
+    );
+  }
+}
+
+export function customElement(tagName: string) {
+  return function (_value: unknown, context: ClassDecoratorContext) {
+    context.addInitializer(function () {
+      window.customElements.define(tagName, this as typeof NotiveElement);
+      (this as typeof NotiveElement).makeFactory = () =>
+        ((...args: any[]) => createElement(tagName, ...args)) as CreateElement<any>;
+    });
+  };
+}
+
+export function eventHandler(eventName: string) {
+  return function (_value: unknown, context: ClassFieldDecoratorContext) {
+    const privateKey = Symbol(context.name.toString());
+
+    context.addInitializer(function () {
+      Object.defineProperty(this, context.name, {
+        get() {
+          return this[privateKey];
+        },
+        set(handler) {
+          const oldHandler = this[privateKey];
+          if (oldHandler) this.removeEventListener(eventName, oldHandler);
+          this[privateKey] = handler;
+          if (handler) this.addEventListener(eventName, handler);
+        },
+        enumerable: true,
+        configurable: true,
+      });
+    });
+  };
+}
diff --git a/web/src/html.ts b/web/src/html.ts
index 8802e50..a118849 100644
--- a/web/src/html.ts
+++ b/web/src/html.ts
@@ -1,3 +1,29 @@
+export function createElement<T extends HTMLElement>(
+  tag: string,
+  ...children: (Node | string)[]
+): T;
+
+export function createElement<T extends HTMLElement>(
+  tag: string,
+  attrs: Partial<T>,
+  ...children: (Node | string)[]
+): T;
+
+export function createElement(tag: string, ...args: any[]) {
+  const el = document.createElement(tag);
+
+  if (args[0]?.constructor === Object) {
+    const { dataset, style, ...attrs } = args.shift();
+    Object.assign(el, attrs);
+    if (dataset) Object.assign(el.dataset, dataset);
+    if (style) Object.assign(el.style, style);
+  }
+
+  el.append(...args.flat());
+
+  return el;
+}
+
 export type CreateElement<T extends HTMLElement> = {
   (...children: (Node | string)[]): T;
   (attrs: Partial<T>, ...children: (Node | string)[]): T;
@@ -9,23 +35,9 @@ type ElementCreator = {
 
 const h = new Proxy({} as ElementCreator, {
   get:
-    (_, tag: string) =>
+    (_, tagName: string) =>
     (...args: any[]) => {
-      const el = document.createElement(tag);
-
-      if (args[0]?.constructor === Object) {
-        const { dataset, ...attrs } = args.shift();
-
-        Object.assign(el, attrs);
-
-        if (dataset) {
-          Object.assign(el.dataset, dataset);
-        }
-      }
-
-      el.append(...args.flat());
-
-      return el;
+      return createElement(tagName, ...args);
     },
 });
 
diff --git a/web/src/index.html b/web/src/index.html
index b296f52..a9cd398 100644
--- a/web/src/index.html
+++ b/web/src/index.html
@@ -6,7 +6,6 @@
     <link rel="stylesheet" href="index.css" />
     <link rel="icon" href="favicon.ico" />
     <script type="module" src="index.ts"></script>
-    <script type="module" src="components/index.ts"></script>
   </head>
   <body>
     <ntv-app></ntv-app>
diff --git a/web/src/index.ts b/web/src/index.ts
index 97cfdf8..4c30907 100644
--- a/web/src/index.ts
+++ b/web/src/index.ts
@@ -1,214 +1 @@
-import Ratio from "./math/Ratio";
-import { Cell, CellRef, Doc, Grid, mapRowsInRange } from "./types";
-import { ActiveCellSelection, Selection } from "./selection";
-import renderGrid, {
-  getRenderedCell,
-  RenderedGrid,
-} from "./components/grid/renderGrid";
-
-function defaultDoc(): Doc {
-  const defaultCells: Cell[] = Array.from({ length: 16 }, () => ({
-    widthRatio: new Ratio(1, 16),
-  }));
-
-  return {
-    grids: [
-      {
-        id: window.crypto.randomUUID(),
-        baseCellSize: 42,
-        baseCellWidthRatio: new Ratio(1, 16),
-        parts: [
-          {
-            rows: Array.from({ length: 4 }, () => ({
-              cells: [...defaultCells],
-            })),
-          },
-        ],
-      },
-      {
-        id: window.crypto.randomUUID(),
-        baseCellSize: 42,
-        baseCellWidthRatio: new Ratio(1, 16),
-        parts: [
-          {
-            rows: Array.from({ length: 2 }, () => ({
-              cells: [...defaultCells],
-            })),
-          },
-          {
-            rows: Array.from({ length: 2 }, () => ({
-              cells: [...defaultCells],
-            })),
-          },
-        ],
-      },
-    ],
-  };
-}
-
-export default class Notive {
-  #doc: Doc = defaultDoc();
-
-  get doc() {
-    return this.#doc;
-  }
-
-  #gridsById = Object.fromEntries(
-    this.#doc.grids.map((grid) => [grid.id, renderGrid(grid)]),
-  );
-
-  getGrid(id: string): RenderedGrid | undefined {
-    return this.#gridsById[id];
-  }
-
-  #selection?: Selection;
-
-  get selection() {
-    return this.#selection;
-  }
-
-  #pendingSelection?: Selection;
-
-  get pendingSelection() {
-    return this.#pendingSelection;
-  }
-
-  selectCell(gridId: string, cellRef: CellRef) {
-    this.#selection = new ActiveCellSelection(gridId, cellRef);
-    this.#dispatchSelectionChanged();
-  }
-
-  startSelecting(gridId: string, cellRef: CellRef) {
-    this.#pendingSelection = new ActiveCellSelection(gridId, cellRef);
-    this.#dispatchSelectionChanged();
-  }
-
-  extendSelection(cellRef: CellRef) {
-    const newSelection = this.pendingSelection?.extend(cellRef);
-
-    if (newSelection !== this.pendingSelection) {
-      this.#pendingSelection = newSelection;
-      this.#dispatchSelectionChanged();
-    }
-  }
-
-  finishSelecting() {
-    this.#selection = this.pendingSelection;
-    this.#pendingSelection = undefined;
-    this.#dispatchSelectionChanged();
-  }
-
-  #dispatchSelectionChanged() {
-    window.dispatchEvent(new CustomEvent("ntv:selectionchange"));
-  }
-
-  subdivideSelection(subdivisions: number) {
-    const selection = this.selection;
-    if (!selection) return;
-
-    const grid = this.getGrid(selection.gridId);
-    if (!grid) return;
-
-    const startCellRef = selection.startCellRef();
-    const endCellRef = selection.endCellRef();
-
-    const startCell = getRenderedCell(grid, startCellRef);
-    const endCell = getRenderedCell(grid, endCellRef);
-    if (!startCell || !endCell) return;
-
-    const startRatio =
-      startCell.startRatio.compare(endCell.startRatio) <= 0
-        ? startCell.startRatio
-        : endCell.startRatio;
-
-    const endRatio =
-      startCell.endRatio.compare(endCell.endRatio) >= 0
-        ? startCell.endRatio
-        : endCell.endRatio;
-
-    const totalWidth = endRatio.subtract(startRatio);
-    const subdivisionWidth = totalWidth.divideRatio(
-      Ratio.fromInteger(subdivisions),
-    );
-
-    const newDoc = mapRowsInRange(
-      this.doc,
-      selection.gridId,
-      startCellRef,
-      endCellRef,
-      (row, rowRef) => {
-        const newCells: Cell[] = [];
-        let currentRatio = Ratio.fromInteger(0);
-
-        for (const cell of row.cells) {
-          const cellStart = currentRatio;
-          const cellEnd = currentRatio.add(cell.widthRatio);
-
-          // Cell is entirely before selection
-          if (cellEnd.compare(startRatio) <= 0) {
-            newCells.push(cell);
-            currentRatio = cellEnd;
-            continue;
-          }
-
-          // Cell is entirely after selection
-          if (cellStart.compare(endRatio) >= 0) {
-            newCells.push(cell);
-            currentRatio = cellEnd;
-            continue;
-          }
-
-          // First cell that overlaps - insert subdivisions
-          if (newCells.length === 0 || currentRatio.compare(startRatio) < 0) {
-            for (let i = 0; i < subdivisions; i++) {
-              newCells.push({ widthRatio: subdivisionWidth });
-            }
-          }
-
-          currentRatio = cellEnd;
-        }
-
-        return { ...row, cells: newCells };
-      },
-    );
-
-    this.#doc = newDoc;
-
-    this.#gridsById = Object.fromEntries(
-      this.#doc.grids.map((grid) => [grid.id, renderGrid(grid)]),
-    );
-
-    window.dispatchEvent(
-      new CustomEvent("ntv:grid:change", {
-        detail: { gridId: selection.gridId },
-      }),
-    );
-  }
-
-  setCellValue(gridId: string, cellRef: CellRef, value: string | undefined) {
-    const grid = this.doc.grids.find((grid) => grid.id === gridId);
-
-    if (!grid) return;
-
-    const cell =
-      grid.parts[cellRef.partIndex].rows[cellRef.rowIndex].cells[
-        cellRef.cellIndex
-      ];
-
-    grid.parts[cellRef.partIndex].rows[cellRef.rowIndex].cells[
-      cellRef.cellIndex
-    ] = { ...cell, value };
-
-    this.#gridsById = Object.fromEntries(
-      this.#doc.grids.map((grid) => [grid.id, renderGrid(grid)]),
-    );
-
-    window.dispatchEvent(
-      new CustomEvent("ntv:grid:change", {
-        detail: { gridId },
-      }),
-    );
-  }
-}
-
-window.notive = new Notive();
+import "./components";
diff --git a/web/tsconfig.json b/web/tsconfig.json
index 91be5ef..b650d24 100644
--- a/web/tsconfig.json
+++ b/web/tsconfig.json
@@ -1,6 +1,6 @@
 {
   "compilerOptions": {
-    "target": "ESNext",
+    "target": "ES2020",
     "module": "ESNext",
     "lib": ["ESNext", "DOM", "DOM.Iterable"],
     "moduleResolution": "bundler",