feat(input): support artboard selection

input/selection.test.ts

@@ -0,0 +1,69 @@
+import { describe, expect, test } from "bun:test";
+import { commandIds } from "@commands/ids";
+import { createInitialAppState } from "@editor/initial-state";
+import { handleArtboardSelection } from "./selection";
+import type { PointerInputEvent } from "./pointer";
+
+const ignoredState = undefined as never;
+
+describe("selection input", () => {
+  test("selects artboard hit by left click", () => {
+    const state = {
+      ...createInitialAppState("Test"),
+      document: {
+        ...createInitialAppState("Test").document,
+        artboards: [{ id: "a1", name: "Artboard", bounds: { x: -50, y: -50, w: 100, h: 100 }, backgroundColor: "transparent", layers: [] }],
+      },
+      editor: {
+        ...createInitialAppState("Test").editor,
+        viewport: { center: { x: 0, y: 0 }, zoom: 1, rotation: 0, size: { w: 200, h: 200 } },
+      },
+    };
+    const dispatched: unknown[] = [];
+
+    const consumed = handleArtboardSelection({
+      event: pointerEvent({ position: { x: 100, y: 100 }, buttons: 1 }),
+      document: state.document,
+      viewport: state.editor.viewport,
+      dispatch: (commandId, payload) => {
+        dispatched.push({ commandId, payload });
+        return ignoredState;
+      },
+    });
+
+    expect(consumed).toBe(true);
+    expect(dispatched).toEqual([{ commandId: commandIds.selectionSet, payload: { artboardId: "a1", layerIds: [] } }]);
+  });
+
+  test("clears selection when clicking outside artboards", () => {
+    const state = createInitialAppState("Test");
+    const dispatched: unknown[] = [];
+
+    const consumed = handleArtboardSelection({
+      event: pointerEvent({ position: { x: 100, y: 100 }, buttons: 1 }),
+      document: state.document,
+      viewport: { center: { x: 0, y: 0 }, zoom: 1, rotation: 0, size: { w: 200, h: 200 } },
+      dispatch: (commandId, payload) => {
+        dispatched.push({ commandId, payload });
+        return ignoredState;
+      },
+    });
+
+    expect(consumed).toBe(true);
+    expect(dispatched).toEqual([{ commandId: commandIds.selectionClear, payload: undefined }]);
+  });
+});
+
+function pointerEvent(overrides: Partial<PointerInputEvent>): PointerInputEvent {
+  return {
+    pointerId: 1,
+    pointerType: "mouse",
+    position: { x: 0, y: 0 },
+    buttons: 0,
+    altKey: false,
+    ctrlKey: false,
+    metaKey: false,
+    shiftKey: false,
+    ...overrides,
+  };
+}