8 files changed, 100 insertions, 25 deletions
diff --git a/src/background/usecases/CommandUseCase.ts b/src/background/usecases/CommandUseCase.ts
index 811ec77..69ef3ea 100644
--- a/src/background/usecases/CommandUseCase.ts
+++ b/src/background/usecases/CommandUseCase.ts
@@ -14,15 +14,17 @@ import RepeatUseCase from "../usecases/RepeatUseCase";
 @injectable()
 export default class CommandIndicator {
   constructor(
-    @inject("TabPresenter") private tabPresenter: TabPresenter,
-    private windowPresenter: WindowPresenter,
-    private helpPresenter: HelpPresenter,
+    @inject("TabPresenter")
+    private readonly tabPresenter: TabPresenter,
+    private readonly windowPresenter: WindowPresenter,
+    private readonly helpPresenter: HelpPresenter,
     @inject("CachedSettingRepository")
-    private cachedSettingRepository: CachedSettingRepository,
-    private bookmarkRepository: BookmarkRepository,
-    private consoleClient: ConsoleClient,
-    private contentMessageClient: ContentMessageClient,
-    private repeatUseCase: RepeatUseCase
+    private readonly cachedSettingRepository: CachedSettingRepository,
+    private readonly bookmarkRepository: BookmarkRepository,
+    @inject("ConsoleClient")
+    private readonly consoleClient: ConsoleClient,
+    private readonly contentMessageClient: ContentMessageClient,
+    private readonly repeatUseCase: RepeatUseCase
   ) {}
 
   async open(keywords: string): Promise<browser.tabs.Tab> {
diff --git a/src/background/usecases/ConsoleUseCase.ts b/src/background/usecases/ConsoleUseCase.ts
index 195c70f..4adba65 100644
--- a/src/background/usecases/ConsoleUseCase.ts
+++ b/src/background/usecases/ConsoleUseCase.ts
@@ -5,8 +5,10 @@ import ConsoleClient from "../infrastructures/ConsoleClient";
 @injectable()
 export default class ConsoleUseCase {
   constructor(
-    @inject("TabPresenter") private tabPresenter: TabPresenter,
-    private consoleClient: ConsoleClient
+    @inject("TabPresenter")
+    private readonly tabPresenter: TabPresenter,
+    @inject("ConsoleClient")
+    private readonly consoleClient: ConsoleClient
   ) {}
 
   async showCommand(): Promise<any> {
diff --git a/src/background/usecases/FindUseCase.ts b/src/background/usecases/FindUseCase.ts
index facc461..404fb48 100644
--- a/src/background/usecases/FindUseCase.ts
+++ b/src/background/usecases/FindUseCase.ts
@@ -6,9 +6,11 @@ import ConsoleClient from "../infrastructures/ConsoleClient";
 @injectable()
 export default class FindUseCase {
   constructor(
-    @inject("TabPresenter") private tabPresenter: TabPresenter,
-    private findRepository: FindRepository,
-    private consoleClient: ConsoleClient
+    @inject("TabPresenter")
+    private readonly tabPresenter: TabPresenter,
+    private readonly findRepository: FindRepository,
+    @inject("ConsoleClient")
+    private readonly consoleClient: ConsoleClient
   ) {}
 
   getKeyword(): Promise<string> {
diff --git a/src/background/usecases/MarkUseCase.ts b/src/background/usecases/MarkUseCase.ts
index 9da9a21..57e04b4 100644
--- a/src/background/usecases/MarkUseCase.ts
+++ b/src/background/usecases/MarkUseCase.ts
@@ -1,16 +1,18 @@
 import { inject, injectable } from "tsyringe";
 import TabPresenter from "../presenters/TabPresenter";
 import MarkRepository from "../repositories/MarkRepository";
-import ConsoleClient from "../infrastructures/ConsoleClient";
 import ContentMessageClient from "../infrastructures/ContentMessageClient";
+import ConsoleClient from "../infrastructures/ConsoleClient";
 
 @injectable()
 export default class MarkUseCase {
   constructor(
-    @inject("TabPresenter") private tabPresenter: TabPresenter,
-    private markRepository: MarkRepository,
-    private consoleClient: ConsoleClient,
-    private contentMessageClient: ContentMessageClient
+    @inject("TabPresenter")
+    private readonly tabPresenter: TabPresenter,
+    private readonly markRepository: MarkRepository,
+    @inject("ConsoleClient")
+    private readonly consoleClient: ConsoleClient,
+    private readonly contentMessageClient: ContentMessageClient
   ) {}
 
   async setGlobal(key: string, x: number, y: number): Promise<any> {
diff --git a/src/background/usecases/NavigateUseCase.ts b/src/background/usecases/NavigateUseCase.ts
index 974606c..29e629a 100644
--- a/src/background/usecases/NavigateUseCase.ts
+++ b/src/background/usecases/NavigateUseCase.ts
@@ -5,8 +5,10 @@ import TabPresenter from "../presenters/TabPresenter";
 @injectable()
 export default class NavigateUseCase {
   constructor(
-    @inject("TabPresenter") private tabPresenter: TabPresenter,
-    private navigateClient: NavigateClient
+    @inject("TabPresenter")
+    private readonly tabPresenter: TabPresenter,
+    @inject("NavigateClient")
+    private readonly navigateClient: NavigateClient
   ) {}
 
   async openHistoryNext(): Promise<void> {
diff --git a/src/background/usecases/RepeatUseCase.ts b/src/background/usecases/RepeatUseCase.ts
index d7235ee..992e76b 100644
--- a/src/background/usecases/RepeatUseCase.ts
+++ b/src/background/usecases/RepeatUseCase.ts
@@ -1,4 +1,4 @@
-import { injectable } from "tsyringe";
+import { inject, injectable } from "tsyringe";
 import * as operations from "../../shared/operations";
 import RepeatRepository from "../repositories/RepeatRepository";
 
@@ -6,7 +6,10 @@ type Operation = operations.Operation;
 
 @injectable()
 export default class RepeatUseCase {
-  constructor(private repeatRepository: RepeatRepository) {}
+  constructor(
+    @inject("RepeatRepository")
+    private readonly repeatRepository: RepeatRepository
+  ) {}
 
   storeLastOperation(op: Operation): void {
     this.repeatRepository.setLastOperation(op);
diff --git a/src/background/usecases/TabUseCase.ts b/src/background/usecases/TabUseCase.ts
index 1439107..900c305 100644
--- a/src/background/usecases/TabUseCase.ts
+++ b/src/background/usecases/TabUseCase.ts
@@ -6,9 +6,11 @@ import BrowserSettingRepository from "../repositories/BrowserSettingRepository";
 @injectable()
 export default class TabUseCase {
   constructor(
-    @inject("TabPresenter") private tabPresenter: TabPresenter,
-    private windowPresenter: WindowPresenter,
-    private browserSettingRepository: BrowserSettingRepository
+    @inject("TabPresenter")
+    private readonly tabPresenter: TabPresenter,
+    private readonly windowPresenter: WindowPresenter,
+    @inject("BrowserSettingRepository")
+    private readonly browserSettingRepository: BrowserSettingRepository
   ) {}
 
   async close(force: boolean, selectLeft = false): Promise<any> {
diff --git a/src/background/usecases/ZoomPresenter.ts b/src/background/usecases/ZoomPresenter.ts
new file mode 100644
index 0000000..5a3c64d
--- /dev/null
+++ b/src/background/usecases/ZoomPresenter.ts
@@ -0,0 +1,60 @@
+const ZOOM_SETTINGS = [
+  0.33,
+  0.5,
+  0.66,
+  0.75,
+  0.8,
+  0.9,
+  1.0,
+  1.1,
+  1.25,
+  1.5,
+  1.75,
+  2.0,
+  2.5,
+  3.0,
+] as const;
+
+export default interface ZoomPresenter {
+  zoomIn(): Promise<void>;
+  zoomOut(): Promise<void>;
+  resetZoom(): Promise<void>;
+}
+
+export class ZoomPresenterImpl implements ZoomPresenter {
+  async zoomIn(): Promise<void> {
+    const tab = await browser.tabs.query({
+      active: true,
+      currentWindow: true,
+    });
+    const tabId = tab[0].id as number;
+    const current = await browser.tabs.getZoom(tabId);
+    const factor = ZOOM_SETTINGS.find((f) => f > current);
+    if (factor) {
+      return browser.tabs.setZoom(tabId, factor);
+    }
+  }
+
+  async zoomOut(): Promise<void> {
+    const tab = await browser.tabs.query({
+      active: true,
+      currentWindow: true,
+    });
+    const tabId = tab[0].id as number;
+    const current = await browser.tabs.getZoom(tabId);
+    const factor = ZOOM_SETTINGS.slice(0)
+      .reverse()
+      .find((f) => f < current);
+    if (factor) {
+      return browser.tabs.setZoom(tabId, factor);
+    }
+  }
+
+  async resetZoom(): Promise<void> {
+    const tab = await browser.tabs.query({
+      active: true,
+      currentWindow: true,
+    });
+    return browser.tabs.setZoom(tab[0].id, 1);
+  }
+}