From 3108b90252e17435ba35154a12b1fda1630aed17 Mon Sep 17 00:00:00 2001
From: Eduard Marcinco <edomarcinco@gmail.com>
Date: Fri, 22 Nov 2024 17:15:03 +0100
Subject: [PATCH] feat: fluid state for dropdown (#3008)

Signed-off-by: Akshat Patel <38994122+Akshat55@users.noreply.github.com>
Co-authored-by: Akshat Patel <38994122+Akshat55@users.noreply.github.com>
---
 src/dropdown/dropdown.component.ts | 83 ++++++++++++++++++++----------
 src/dropdown/dropdown.stories.ts   | 10 +++-
 2 files changed, 66 insertions(+), 27 deletions(-)

diff --git a/src/dropdown/dropdown.component.ts b/src/dropdown/dropdown.component.ts
index 8f72f5366d..1fa5a48235 100644
--- a/src/dropdown/dropdown.component.ts
+++ b/src/dropdown/dropdown.component.ts
@@ -69,7 +69,7 @@ import { hasScrollableParents } from "carbon-components-angular/utils";
 	<div
 		class="cds--list-box"
 		[ngClass]="{
-			'cds--dropdown': type !== 'multi',
+			'cds--dropdown': type !== 'multi' && !(skeleton && fluid),
 			'cds--multiselect': type === 'multi',
 			'cds--multi-select--selected': type === 'multi' && getSelectedCount() > 0,
 			'cds--dropdown--light': theme === 'light',
@@ -83,8 +83,11 @@ import { hasScrollableParents } from "carbon-components-angular/utils";
 			'cds--dropdown--sm cds--list-box--sm': size === 'sm',
 			'cds--dropdown--md cds--list-box--md': size === 'md',
 			'cds--dropdown--lg cds--list-box--lg': size === 'lg',
-			'cds--list-box--expanded': !menuIsClosed
-		}">
+			'cds--list-box--expanded': !menuIsClosed,
+			'cds--list-box--invalid': invalid
+		}"
+		[attr.data-invalid]="invalid ? true : null">
+		<div *ngIf="skeleton && fluid" class="cds--list-box__label"></div>
 		<button
 			#dropdownButton
 			[id]="id"
@@ -96,7 +99,8 @@ import { hasScrollableParents } from "carbon-components-angular/utils";
 			[attr.aria-readonly]="readonly"
 			aria-haspopup="listbox"
 			(click)="disabled || readonly ? $event.stopPropagation() : toggleMenu()"
-			(blur)="onBlur()"
+			(focus)="fluid ? handleFocus($event) : null"
+			(blur)="fluid ? handleFocus($event) : onBlur()"
 			[attr.disabled]="disabled ? true : null">
 			<div
 				(click)="clearSelected()"
@@ -125,18 +129,6 @@ import { hasScrollableParents } from "carbon-components-angular/utils";
 				[ngTemplateOutletContext]="getRenderTemplateContext()"
 				[ngTemplateOutlet]="displayValue">
 			</ng-template>
-			<svg
-				*ngIf="invalid"
-				class="cds--dropdown__invalid-icon"
-				cdsIcon="warning--filled"
-				size="16">
-			</svg>
-			<svg
-				*ngIf="!invalid && warn"
-				cdsIcon="warning--alt--filled"
-				size="16"
-				class="cds--list-box__invalid-icon cds--list-box__invalid-icon--warning">
-			</svg>
 			<span class="cds--list-box__menu-icon">
 				<svg
 					*ngIf="!skeleton"
@@ -147,6 +139,18 @@ import { hasScrollableParents } from "carbon-components-angular/utils";
 				</svg>
 			</span>
 		</button>
+		<svg
+			*ngIf="invalid"
+			class="cds--list-box__invalid-icon"
+			cdsIcon="warning--filled"
+			size="16">
+		</svg>
+		<svg
+			*ngIf="!invalid && warn"
+			cdsIcon="warning--alt--filled"
+			size="16"
+			class="cds--list-box__invalid-icon cds--list-box__invalid-icon--warning">
+		</svg>
 		<div
 			#dropdownMenu
 			[ngClass]="{
@@ -155,8 +159,9 @@ import { hasScrollableParents } from "carbon-components-angular/utils";
 			<ng-content *ngIf="!menuIsClosed"></ng-content>
 		</div>
 	</div>
+	<hr *ngIf="fluid" class="cds--list-box__divider" />
 	<div
-		*ngIf="helperText && !invalid && !warn && !skeleton"
+		*ngIf="helperText && !invalid && !warn && !skeleton && !fluid"
 		class="cds--form__helper-text"
 		[ngClass]="{
 			'cds--form__helper-text--disabled': disabled
@@ -183,6 +188,25 @@ import { hasScrollableParents } from "carbon-components-angular/utils";
 })
 export class Dropdown implements OnInit, AfterContentInit, AfterViewInit, OnDestroy, ControlValueAccessor {
 	static dropdownCount = 0;
+	@HostBinding("class.cds--list-box__wrapper--fluid--invalid") get fluidInvalidClass() {
+		return this.invalid && this.fluid;
+	}
+
+	@HostBinding("class.cds--list-box__wrapper--fluid--focus") get fluidFocusClass() {
+		return this.fluid && this._isFocused && this.menuIsClosed;
+	}
+
+	protected get writtenValue() {
+		return this._writtenValue;
+	}
+
+	protected set writtenValue(val: any[]) {
+		if (val && val.length === 0) {
+			this.clearSelected();
+		}
+		this._writtenValue = val;
+	}
+
 	@Input() id = `dropdown-${Dropdown.dropdownCount++}`;
 	/**
 	 * Label for the dropdown.
@@ -319,6 +343,13 @@ export class Dropdown implements OnInit, AfterContentInit, AfterViewInit, OnDest
 	@ViewChild("dropdownMenu", { static: true }) dropdownMenu;
 
 	@HostBinding("class.cds--dropdown__wrapper") hostClass = true;
+
+	@HostBinding("class.cds--list-box__wrapper") hostWrapperClass = true;
+	/**
+	 * Experimental: enable fluid state
+	 */
+	@HostBinding("class.cds--list-box__wrapper--fluid") @Input() fluid = false;
+
 	/**
 	 * Set to `true` if the dropdown is closed (not expanded).
 	 */
@@ -340,17 +371,10 @@ export class Dropdown implements OnInit, AfterContentInit, AfterViewInit, OnDest
 
 	protected onTouchedCallback: () => void = this._noop;
 
+	protected _isFocused = false;
+
 	// primarily used to capture and propagate input to `writeValue` before the content is available
 	private _writtenValue: any = [];
-	protected get writtenValue() {
-		return this._writtenValue;
-	}
-	protected set writtenValue(val: any[]) {
-		if (val && val.length === 0) {
-			this.clearSelected();
-		}
-		this._writtenValue = val;
-	}
 
 	/**
 	 * Creates an instance of Dropdown.
@@ -801,6 +825,13 @@ export class Dropdown implements OnInit, AfterContentInit, AfterViewInit, OnDest
 		return value instanceof TemplateRef;
 	}
 
+	handleFocus(event: FocusEvent) {
+		this._isFocused = event.type === "focus";
+		if (event.type === "blur") {
+			this.onBlur();
+		}
+	}
+
 	/**
 	 * Controls when it's needed to apply the selection feedback
 	 */
diff --git a/src/dropdown/dropdown.stories.ts b/src/dropdown/dropdown.stories.ts
index 4d89220cdb..b7fbc62e65 100644
--- a/src/dropdown/dropdown.stories.ts
+++ b/src/dropdown/dropdown.stories.ts
@@ -65,7 +65,8 @@ export default {
 		appendInline: false,
 		dropUp: false,
 		size: "md",
-		theme: "dark"
+		theme: "dark",
+		fluid: false
 	},
 	argTypes: {
 		type: {
@@ -103,6 +104,7 @@ const Template = (args) => ({
 			placeholder="Select"
 			[disabled]="disabled"
 			[readonly]="readonly"
+			[fluid]="fluid"
 			(selected)="selected($event)"
 			(onClose)="onClose($event)">
 			<cds-dropdown-list [items]="items"></cds-dropdown-list>
@@ -111,6 +113,11 @@ const Template = (args) => ({
 });
 export const Basic = Template.bind({});
 
+export const Fluid = Template.bind({});
+Fluid.args = {
+	fluid: true
+};
+
 const MultiTemplate = (args) => ({
 	props: args,
 	template: `
@@ -131,6 +138,7 @@ const MultiTemplate = (args) => ({
 			placeholder="Select"
 			[disabled]="disabled"
 			[readonly]="readonly"
+			[fluid]="fluid"
 			(selected)="selected($event)"
 			(onClose)="onClose($event)">
 			<cds-dropdown-list [items]="items"></cds-dropdown-list>