feat(input): route temporary pan through tool state

input/viewport-pan.ts

@@ -0,0 +1,48 @@
+import type { Dispatch } from "@commands/dispatcher";
+import type { GlobalKeybindConsumer, KeybindEvent } from "./keyboard";
+import type { GlobalPointerConsumer, PointerInputEvent } from "./pointer";
+import { createViewportPointerPanHandler } from "./viewport";
+
+export type ViewportPanInputController = {
+  keyDown(event: KeybindEvent): boolean;
+  keyUp(event: KeybindEvent): boolean;
+  pointerDown(event: PointerInputEvent): boolean;
+  pointerMove(event: PointerInputEvent): boolean;
+  pointerUp(event: PointerInputEvent): boolean;
+  isPanMode(): boolean;
+};
+
+export function createViewportPanInputController(options: {
+  globalKeyConsumer: GlobalKeybindConsumer;
+  globalPointerConsumer: GlobalPointerConsumer;
+  dispatch: Dispatch;
+  getCurrentZoom: () => number;
+  isPanMode: () => boolean;
+}): ViewportPanInputController {
+  const pointerPan = createViewportPointerPanHandler({
+    globalConsumer: options.globalPointerConsumer,
+    dispatch: options.dispatch,
+    getCurrentZoom: options.getCurrentZoom,
+    canPan: (event) => event.pointerType !== "mouse" || (event.buttons & 4) === 4 || (options.isPanMode() && (event.buttons & 1) === 1),
+  });
+
+  return {
+    keyDown(event) {
+      if (options.globalKeyConsumer(event)) return true;
+      if (event.code !== "Space") return false;
+
+      options.dispatch("tool.enterTemporaryPan", undefined);
+      return true;
+    },
+    keyUp(event) {
+      if (event.code !== "Space") return false;
+
+      options.dispatch("tool.exitTemporaryPan", undefined);
+      return true;
+    },
+    pointerDown: pointerPan.pointerDown,
+    pointerMove: pointerPan.pointerMove,
+    pointerUp: pointerPan.pointerUp,
+    isPanMode: options.isPanMode,
+  };
+}