feat(input): route temporary pan through tool state

input/index.ts

@@ -5,6 +5,8 @@ export {
 } from "./dom";
 export type { CommandKeybind, GlobalKeybindConsumer, Keybind, KeybindEvent, KeybindMap } from "./keyboard";
 export { handleKeybind, keybindFromEvent } from "./keyboard";
+export type { ViewportPanInputController } from "./viewport-pan";
+export { createViewportPanInputController } from "./viewport-pan";
 export type { GlobalPointerConsumer, GlobalWheelConsumer, PointerInputEvent, WheelInputEvent } from "./pointer";
 export type { ViewportPointerPanHandler } from "./viewport";
 export { createViewportPointerPanHandler, handleViewportWheel } from "./viewport";

input/viewport-pan.test.ts

@@ -0,0 +1,48 @@
+import { describe, expect, test } from "bun:test";
+import { createViewportPanInputController } from "./viewport-pan";
+
+const ignoredState = undefined as never;
+
+describe("viewport pan input controller", () => {
+  test("space enters and exits temporary pan through commands", () => {
+    const dispatched: unknown[] = [];
+    const controller = createViewportPanInputController({
+      globalKeyConsumer: () => false,
+      globalPointerConsumer: () => false,
+      getCurrentZoom: () => 1,
+      isPanMode: () => false,
+      dispatch: (commandId, payload) => {
+        dispatched.push({ commandId, payload });
+        return ignoredState;
+      },
+    });
+
+    expect(controller.keyDown(keyEvent("Space"))).toBe(true);
+    expect(controller.keyUp(keyEvent("Space"))).toBe(true);
+    expect(dispatched).toEqual([
+      { commandId: "tool.enterTemporaryPan", payload: undefined },
+      { commandId: "tool.exitTemporaryPan", payload: undefined },
+    ]);
+  });
+
+  test("global key consumer prevents temporary pan command", () => {
+    let dispatched = false;
+    const controller = createViewportPanInputController({
+      globalKeyConsumer: () => true,
+      globalPointerConsumer: () => false,
+      getCurrentZoom: () => 1,
+      isPanMode: () => false,
+      dispatch: () => {
+        dispatched = true;
+        return ignoredState;
+      },
+    });
+
+    expect(controller.keyDown(keyEvent("Space"))).toBe(true);
+    expect(dispatched).toBe(false);
+  });
+});
+
+function keyEvent(code: string) {
+  return { key: code === "Space" ? " " : code, code, altKey: false, ctrlKey: false, metaKey: false, shiftKey: false };
+}

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,
+  };
+}

input/viewport.ts

@@ -11,11 +11,12 @@ export function createViewportPointerPanHandler(options: {
   globalConsumer: GlobalPointerConsumer;
   dispatch: Dispatch;
   getCurrentZoom: () => number;
+  canPan?: (event: PointerInputEvent) => boolean;
 }): ViewportPointerPanHandler {
   let activePointerId: number | undefined;
   let lastPosition: PointerInputEvent["position"] | undefined;
 
-  const canPan = (event: PointerInputEvent) => event.pointerType !== "mouse" || (event.buttons & 4) === 4;
+  const canPan = options.canPan ?? defaultCanPan;
 
   return {
     pointerDown(event) {
@@ -55,6 +56,10 @@ export function createViewportPointerPanHandler(options: {
   };
 }
 
+function defaultCanPan(event: PointerInputEvent) {
+  return event.pointerType !== "mouse" || (event.buttons & 4) === 4;
+}
+
 export function handleViewportWheel(options: {
   event: WheelInputEvent;
   globalConsumer: GlobalWheelConsumer;