Merge pull request #917 from ueokande/operation-as-a-operator

refactor: Make each operation as an operator

1 files changed, 28 insertions, 0 deletions

diff --git a/src/background/operators/impls/ZoomOperatorFactoryChain.ts b/src/background/operators/impls/ZoomOperatorFactoryChain.ts
new file mode 100644
index 0000000..bf930a7
--- /dev/null
+++ b/src/background/operators/impls/ZoomOperatorFactoryChain.ts
@@ -0,0 +1,28 @@
+import { inject, injectable } from "tsyringe";
+import Operator from "../Operator";
+import OperatorFactoryChain from "../OperatorFactoryChain";
+import ZoomInOperator from "./ZoomInOperator";
+import ZoomOutOperator from "./ZoomOutOperator";
+import ResetZoomOperator from "./ResetZoomOperator";
+import ZoomPresenter from "../../presenters/ZoomPresenter";
+import * as operations from "../../../shared/operations";
+
+@injectable()
+export default class ZoomOperatorFactoryChain implements OperatorFactoryChain {
+  constructor(
+    @inject("ZoomPresenter")
+    private readonly zoomPresenter: ZoomPresenter
+  ) {}
+
+  create(op: operations.Operation): Operator | null {
+    switch (op.type) {
+      case operations.ZOOM_IN:
+        return new ZoomInOperator(this.zoomPresenter);
+      case operations.ZOOM_OUT:
+        return new ZoomOutOperator(this.zoomPresenter);
+      case operations.ZOOM_NEUTRAL:
+        return new ResetZoomOperator(this.zoomPresenter);
+    }
+    return null;
+  }
+}