From ff7b625851cf4c23b8e02f1ed1186448fa645601 Mon Sep 17 00:00:00 2001
From: Oscar Hinton <Hinton@users.noreply.github.com>
Date: Fri, 5 Dec 2025 13:06:03 +0100
Subject: [PATCH] [CL-946] Migrate ToggleGroup to OnPush (#17718)

Migrates the ToggleGroup and Toggle components to use OnPush.
---
 .../toggle-group.component.spec.ts            |  19 +-
 .../toggle-group/toggle-group.component.ts    |  39 ++--
 .../src/toggle-group/toggle.component.html    |  12 +-
 .../src/toggle-group/toggle.component.spec.ts |  64 ++++++-
 .../src/toggle-group/toggle.component.ts      | 166 +++++++++---------
 5 files changed, 178 insertions(+), 122 deletions(-)

diff --git a/libs/components/src/toggle-group/toggle-group.component.spec.ts b/libs/components/src/toggle-group/toggle-group.component.spec.ts
index 3a9d35b862..5c1345df6f 100644
--- a/libs/components/src/toggle-group/toggle-group.component.spec.ts
+++ b/libs/components/src/toggle-group/toggle-group.component.spec.ts
@@ -1,4 +1,4 @@
-import { Component } from "@angular/core";
+import { ChangeDetectionStrategy, Component, signal, WritableSignal } from "@angular/core";
 import { ComponentFixture, TestBed } from "@angular/core/testing";
 import { By } from "@angular/platform-browser";
 
@@ -30,31 +30,29 @@ describe("Button", () => {
   });
 
   it("should select second element when setting selected to second", () => {
-    testAppComponent.selected = "second";
+    testAppComponent.selected.set("second");
     fixture.detectChanges();
 
-    expect(buttonElements[1].selected).toBe(true);
+    expect(buttonElements[1].selected()).toBe(true);
   });
 
   it("should not select second element when setting selected to third", () => {
-    testAppComponent.selected = "third";
+    testAppComponent.selected.set("third");
     fixture.detectChanges();
 
-    expect(buttonElements[1].selected).toBe(false);
+    expect(buttonElements[1].selected()).toBe(false);
   });
 
   it("should emit new value when changing selection by clicking on radio button", () => {
-    testAppComponent.selected = "first";
+    testAppComponent.selected.set("first");
     fixture.detectChanges();
 
     radioButtons[1].click();
 
-    expect(testAppComponent.selected).toBe("second");
+    expect(testAppComponent.selected()).toBe("second");
   });
 });
 
-// FIXME(https://bitwarden.atlassian.net/browse/CL-764): Migrate to OnPush
-// eslint-disable-next-line @angular-eslint/prefer-on-push-component-change-detection
 @Component({
   selector: "test-app",
   template: `
@@ -65,7 +63,8 @@ describe("Button", () => {
     </bit-toggle-group>
   `,
   imports: [ToggleGroupModule],
+  changeDetection: ChangeDetectionStrategy.OnPush,
 })
 class TestAppComponent {
-  selected?: string;
+  readonly selected: WritableSignal<string | undefined> = signal(undefined);
 }
diff --git a/libs/components/src/toggle-group/toggle-group.component.ts b/libs/components/src/toggle-group/toggle-group.component.ts
index bde8f0ea9b..ee619eb15d 100644
--- a/libs/components/src/toggle-group/toggle-group.component.ts
+++ b/libs/components/src/toggle-group/toggle-group.component.ts
@@ -1,39 +1,44 @@
 import {
   booleanAttribute,
+  ChangeDetectionStrategy,
   Component,
-  EventEmitter,
-  HostBinding,
-  Output,
+  computed,
   input,
   model,
 } from "@angular/core";
 
 let nextId = 0;
 
-// FIXME(https://bitwarden.atlassian.net/browse/CL-764): Migrate to OnPush
-// eslint-disable-next-line @angular-eslint/prefer-on-push-component-change-detection
 @Component({
   selector: "bit-toggle-group",
   templateUrl: "./toggle-group.component.html",
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  host: {
+    role: "radiogroup",
+    "[class]": "classlist()",
+  },
 })
 export class ToggleGroupComponent<TValue = unknown> {
-  private id = nextId++;
-  name = `bit-toggle-group-${this.id}`;
+  private readonly id = nextId++;
 
+  readonly name = `bit-toggle-group-${this.id}`;
+
+  /**
+   * Whether the toggle group should take up the full width of its container.
+   * When true, each toggle button will be equally sized to fill the available space.
+   */
   readonly fullWidth = input<boolean, unknown>(undefined, { transform: booleanAttribute });
-  readonly selected = model<TValue>();
-  // FIXME(https://bitwarden.atlassian.net/browse/CL-903): Migrate to Signals
-  // eslint-disable-next-line @angular-eslint/prefer-output-emitter-ref
-  @Output() selectedChange = new EventEmitter<TValue>();
 
-  @HostBinding("attr.role") role = "radiogroup";
-  @HostBinding("class")
-  get classList() {
-    return ["tw-flex"].concat(this.fullWidth() ? ["tw-w-full", "[&>*]:tw-flex-1"] : []);
-  }
+  /**
+   * The selected value in the toggle group.
+   */
+  readonly selected = model<TValue>();
+
+  protected readonly classlist = computed(() =>
+    ["tw-flex"].concat(this.fullWidth() ? ["tw-w-full", "[&>*]:tw-flex-1"] : []),
+  );
 
   onInputInteraction(value: TValue) {
     this.selected.set(value);
-    this.selectedChange.emit(value);
   }
 }
diff --git a/libs/components/src/toggle-group/toggle.component.html b/libs/components/src/toggle-group/toggle.component.html
index d036b1751b..5104fbb864 100644
--- a/libs/components/src/toggle-group/toggle.component.html
+++ b/libs/components/src/toggle-group/toggle.component.html
@@ -1,16 +1,16 @@
 <input
   type="radio"
-  id="bit-toggle-{{ id }}"
+  [id]="id"
   [name]="name"
-  [ngClass]="inputClasses"
-  [checked]="selected"
-  (change)="onInputInteraction()"
+  [class]="inputClasses"
+  [checked]="selected()"
+  (change)="handleInputChange()"
 />
-<label for="bit-toggle-{{ id }}" [ngClass]="labelClasses" [title]="labelTitle()">
+<label [for]="id" [class]="labelClasses" [title]="labelTitle()">
   <span class="tw-line-clamp-2 tw-break-words" #labelContent>
     <ng-content></ng-content>
   </span>
-  <span class="tw-shrink-0" #bitBadgeContainer [hidden]="!bitBadgeContainerHasChidlren()">
+  <span class="tw-shrink-0" [hidden]="!hasBadge()">
     <ng-content select="[bitBadge]"></ng-content>
   </span>
 </label>
diff --git a/libs/components/src/toggle-group/toggle.component.spec.ts b/libs/components/src/toggle-group/toggle.component.spec.ts
index d3bc2e0eee..6f3c10c0ff 100644
--- a/libs/components/src/toggle-group/toggle.component.spec.ts
+++ b/libs/components/src/toggle-group/toggle.component.spec.ts
@@ -1,7 +1,9 @@
-import { Component, DebugElement } from "@angular/core";
+import { ChangeDetectionStrategy, Component, DebugElement, signal } from "@angular/core";
 import { ComponentFixture, TestBed } from "@angular/core/testing";
 import { By } from "@angular/platform-browser";
 
+import { BadgeModule } from "../badge";
+
 import { ToggleGroupComponent } from "./toggle-group.component";
 import { ToggleGroupModule } from "./toggle-group.module";
 
@@ -45,8 +47,45 @@ describe("Toggle", () => {
   });
 });
 
-// FIXME(https://bitwarden.atlassian.net/browse/CL-764): Migrate to OnPush
-// eslint-disable-next-line @angular-eslint/prefer-on-push-component-change-detection
+describe("Toggle with badge content", () => {
+  let fixtureWithBadge: ComponentFixture<TestComponentWithBadgeComponent>;
+  let badgeContainers: DebugElement[];
+
+  beforeEach(async () => {
+    TestBed.configureTestingModule({
+      imports: [TestComponentWithBadgeComponent],
+    });
+
+    await TestBed.compileComponents();
+    fixtureWithBadge = TestBed.createComponent(TestComponentWithBadgeComponent);
+    fixtureWithBadge.detectChanges();
+    badgeContainers = fixtureWithBadge.debugElement.queryAll(By.css(".tw-shrink-0"));
+  });
+
+  it("should hide badge container when no badge content is projected", () => {
+    // First toggle has no badge
+    expect(badgeContainers[0].nativeElement.hidden).toBe(true);
+
+    // Second toggle has a badge
+    expect(badgeContainers[1].nativeElement.hidden).toBe(false);
+
+    // Third toggle has no badge
+    expect(badgeContainers[2].nativeElement.hidden).toBe(true);
+  });
+
+  it("should show badge container when badge content is projected", () => {
+    const badgeElement = fixtureWithBadge.debugElement.query(By.css("[bitBadge]"));
+    expect(badgeElement).toBeTruthy();
+    expect(badgeElement.nativeElement.textContent.trim()).toBe("2");
+  });
+
+  it("should render badge content correctly", () => {
+    const badges = fixtureWithBadge.debugElement.queryAll(By.css("[bitBadge]"));
+    expect(badges.length).toBe(1);
+    expect(badges[0].nativeElement.textContent.trim()).toBe("2");
+  });
+});
+
 @Component({
   selector: "test-component",
   template: `
@@ -56,7 +95,24 @@ describe("Toggle", () => {
     </bit-toggle-group>
   `,
   imports: [ToggleGroupModule],
+  changeDetection: ChangeDetectionStrategy.OnPush,
 })
 class TestComponent {
-  selected = 0;
+  readonly selected = signal(0);
+}
+
+@Component({
+  selector: "test-component-with-badge",
+  template: `
+    <bit-toggle-group [(selected)]="selected">
+      <bit-toggle [value]="0">Zero</bit-toggle>
+      <bit-toggle [value]="1">One <span bitBadge variant="info">2</span></bit-toggle>
+      <bit-toggle [value]="2">Two</bit-toggle>
+    </bit-toggle-group>
+  `,
+  imports: [ToggleGroupModule, BadgeModule],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+})
+class TestComponentWithBadgeComponent {
+  readonly selected = signal(0);
 }
diff --git a/libs/components/src/toggle-group/toggle.component.ts b/libs/components/src/toggle-group/toggle.component.ts
index 538b31f6a3..d3efbb84a8 100644
--- a/libs/components/src/toggle-group/toggle.component.ts
+++ b/libs/components/src/toggle-group/toggle.component.ts
@@ -1,113 +1,109 @@
-import { NgClass } from "@angular/common";
 import {
-  AfterContentChecked,
-  AfterViewInit,
+  afterNextRender,
+  ChangeDetectionStrategy,
   Component,
+  computed,
+  contentChild,
   ElementRef,
-  HostBinding,
-  signal,
+  inject,
   input,
+  signal,
   viewChild,
 } from "@angular/core";
 
+import { BadgeComponent } from "../badge";
+
 import { ToggleGroupComponent } from "./toggle-group.component";
 
 let nextId = 0;
 
-// FIXME(https://bitwarden.atlassian.net/browse/CL-764): Migrate to OnPush
-// eslint-disable-next-line @angular-eslint/prefer-on-push-component-change-detection
 @Component({
   selector: "bit-toggle",
   templateUrl: "./toggle.component.html",
-  imports: [NgClass],
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  host: {
+    tabindex: "-1",
+    "[class]": "hostClasses",
+  },
 })
-export class ToggleComponent<TValue> implements AfterContentChecked, AfterViewInit {
-  id = nextId++;
+export class ToggleComponent<TValue> {
+  protected readonly id = "bit-toggle-" + nextId++;
+
+  private readonly groupComponent = inject(ToggleGroupComponent<TValue>);
 
   readonly value = input.required<TValue>();
-  readonly labelContent = viewChild<ElementRef<HTMLSpanElement>>("labelContent");
-  readonly bitBadgeContainer = viewChild<ElementRef<HTMLSpanElement>>("bitBadgeContainer");
+  protected readonly labelContent = viewChild<ElementRef<HTMLSpanElement>>("labelContent");
+  protected readonly badgeElement = contentChild(BadgeComponent);
+  protected readonly hasBadge = computed(() => !!this.badgeElement());
 
-  constructor(private groupComponent: ToggleGroupComponent<TValue>) {}
-
-  @HostBinding("tabIndex") tabIndex = "-1";
-  @HostBinding("class") classList = ["tw-group/toggle", "tw-flex", "tw-min-w-16"];
-
-  protected readonly bitBadgeContainerHasChidlren = signal(false);
   protected readonly labelTitle = signal<string | null>(null);
 
-  get name() {
-    return this.groupComponent.name;
+  constructor() {
+    // Set label title after view is initialized
+    afterNextRender(() => {
+      const labelText = this.labelContent()?.nativeElement.innerText;
+      if (labelText) {
+        this.labelTitle.set(labelText);
+      }
+    });
   }
 
-  get selected() {
-    return this.groupComponent.selected() === this.value();
-  }
+  protected readonly name = this.groupComponent.name;
+  readonly selected = computed(() => this.groupComponent.selected() === this.value());
 
-  get inputClasses() {
-    return ["tw-peer/toggle-input", "tw-appearance-none", "tw-outline-none"];
-  }
-
-  get labelClasses() {
-    return [
-      "tw-h-full",
-      "tw-w-full",
-      "tw-flex",
-      "tw-items-center",
-      "tw-justify-center",
-      "tw-gap-1.5",
-      "!tw-font-medium",
-      "tw-leading-5",
-      "tw-transition",
-      "tw-text-center",
-      "tw-text-sm",
-      "tw-border-primary-600",
-      "!tw-text-primary-600",
-      "tw-border-solid",
-      "tw-border-y",
-      "tw-border-r",
-      "tw-border-l-0",
-      "tw-cursor-pointer",
-      "hover:tw-bg-hover-default",
-
-      "group-first-of-type/toggle:tw-border-l",
-      "group-first-of-type/toggle:tw-rounded-s-full",
-      "group-last-of-type/toggle:tw-rounded-e-full",
-
-      "peer-focus-visible/toggle-input:tw-outline-none",
-      "peer-focus-visible/toggle-input:tw-ring",
-      "peer-focus-visible/toggle-input:tw-ring-offset-2",
-      "peer-focus-visible/toggle-input:tw-ring-primary-600",
-      "peer-focus-visible/toggle-input:tw-z-10",
-      "peer-focus-visible/toggle-input:tw-bg-primary-600",
-      "peer-focus-visible/toggle-input:tw-border-primary-600",
-      "peer-focus-visible/toggle-input:!tw-text-contrast",
-
-      "peer-checked/toggle-input:tw-bg-primary-600",
-      "peer-checked/toggle-input:tw-border-primary-600",
-      "peer-checked/toggle-input:!tw-text-contrast",
-      "tw-py-1.5",
-      "tw-px-3",
-
-      // Fix for bootstrap styles that add bottom margin
-      "!tw-mb-0",
-    ];
-  }
-
-  onInputInteraction() {
+  protected handleInputChange() {
     this.groupComponent.onInputInteraction(this.value());
   }
 
-  ngAfterContentChecked() {
-    this.bitBadgeContainerHasChidlren.set(
-      (this.bitBadgeContainer()?.nativeElement.childElementCount ?? 0) > 0,
-    );
-  }
+  protected readonly hostClasses = ["tw-group/toggle", "tw-flex", "tw-min-w-16"];
 
-  ngAfterViewInit() {
-    const labelText = this.labelContent()?.nativeElement.innerText;
-    if (labelText) {
-      this.labelTitle.set(labelText);
-    }
-  }
+  protected readonly inputClasses = [
+    "tw-peer/toggle-input",
+    "tw-appearance-none",
+    "tw-outline-none",
+  ];
+
+  protected readonly labelClasses = [
+    "tw-h-full",
+    "tw-w-full",
+    "tw-flex",
+    "tw-items-center",
+    "tw-justify-center",
+    "tw-gap-1.5",
+    "!tw-font-medium",
+    "tw-leading-5",
+    "tw-transition",
+    "tw-text-center",
+    "tw-text-sm",
+    "tw-border-primary-600",
+    "!tw-text-primary-600",
+    "tw-border-solid",
+    "tw-border-y",
+    "tw-border-r",
+    "tw-border-l-0",
+    "tw-cursor-pointer",
+    "hover:tw-bg-hover-default",
+
+    "group-first-of-type/toggle:tw-border-l",
+    "group-first-of-type/toggle:tw-rounded-s-full",
+    "group-last-of-type/toggle:tw-rounded-e-full",
+
+    "peer-focus-visible/toggle-input:tw-outline-none",
+    "peer-focus-visible/toggle-input:tw-ring",
+    "peer-focus-visible/toggle-input:tw-ring-offset-2",
+    "peer-focus-visible/toggle-input:tw-ring-primary-600",
+    "peer-focus-visible/toggle-input:tw-z-10",
+    "peer-focus-visible/toggle-input:tw-bg-primary-600",
+    "peer-focus-visible/toggle-input:tw-border-primary-600",
+    "peer-focus-visible/toggle-input:!tw-text-contrast",
+
+    "peer-checked/toggle-input:tw-bg-primary-600",
+    "peer-checked/toggle-input:tw-border-primary-600",
+    "peer-checked/toggle-input:!tw-text-contrast",
+    "tw-py-1.5",
+    "tw-px-3",
+
+    // Fix for bootstrap styles that add bottom margin
+    "!tw-mb-0",
+  ];
 }