Add box brush command helpers and implementations

src/commands/create-box-brush-command.ts

@@ -0,0 +1,67 @@
+import type { ToolMode } from "../core/tool-mode";
+import { createBoxBrush, DEFAULT_BOX_BRUSH_CENTER, DEFAULT_BOX_BRUSH_SIZE } from "../document/brushes";
+import { DEFAULT_GRID_SIZE, snapPositiveSizeToGrid, snapVec3ToGrid } from "../geometry/grid-snapping";
+
+import { createOpaqueId } from "../core/ids";
+import type { EditorSelection } from "../core/selection";
+import type { Vec3 } from "../core/vector";
+
+import { cloneSelectionForCommand, removeBrush, setSingleBrushSelection } from "./brush-command-helpers";
+import type { EditorCommand } from "./command";
+
+interface CreateBoxBrushCommandOptions {
+  center?: Vec3;
+  size?: Vec3;
+  gridSize?: number;
+}
+
+export function createCreateBoxBrushCommand(options: CreateBoxBrushCommandOptions = {}): EditorCommand {
+  const brush = createBoxBrush({
+    center: snapVec3ToGrid(options.center ?? DEFAULT_BOX_BRUSH_CENTER, options.gridSize ?? DEFAULT_GRID_SIZE),
+    size: snapPositiveSizeToGrid(options.size ?? DEFAULT_BOX_BRUSH_SIZE, options.gridSize ?? DEFAULT_GRID_SIZE)
+  });
+
+  let previousSelection: EditorSelection | null = null;
+  let previousToolMode: ToolMode | null = null;
+
+  return {
+    id: createOpaqueId("command"),
+    label: "Create box brush",
+    execute(context) {
+      const currentDocument = context.getDocument();
+
+      if (currentDocument.brushes[brush.id] !== undefined) {
+        throw new Error(`Box brush ${brush.id} already exists.`);
+      }
+
+      if (previousSelection === null) {
+        previousSelection = cloneSelectionForCommand(context.getSelection());
+      }
+
+      if (previousToolMode === null) {
+        previousToolMode = context.getToolMode();
+      }
+
+      context.setDocument({
+        ...currentDocument,
+        brushes: {
+          ...currentDocument.brushes,
+          [brush.id]: brush
+        }
+      });
+      context.setSelection(setSingleBrushSelection(brush.id));
+      context.setToolMode("select");
+    },
+    undo(context) {
+      context.setDocument(removeBrush(context.getDocument(), brush.id));
+
+      if (previousSelection !== null) {
+        context.setSelection(previousSelection);
+      }
+
+      if (previousToolMode !== null) {
+        context.setToolMode(previousToolMode);
+      }
+    }
+  };
+}