Update the sidebar tab rearranger to use Drag and Drop (again)

langs/en-ca.json

@@ -90,6 +90,7 @@
 			}
 		},
 		"apps": {
+			"discard-changes": "Discard Changes",
 			"no-settings-to-display": "No settings to display",
 			"make-global-reference": "Make Global Reference",
 			"StatusEffectIconConfig": {
@@ -99,7 +100,9 @@
 				"select-using-image-tagger": "Select using Image Tagger"
 			},
 			"SidebarTabRearranger": {
-				"title": "Rearrange Sidebar Tabs"
+				"title": "Rearrange Sidebar Tabs",
+				"top": "Top",
+				"bottom": "Bottom"
 			}
 		},
 		"notifs": {

module/apps/SidebarTabRearranger.mjs

@@ -1,6 +1,8 @@
 import { __ID__, filePath } from "../consts.mjs";
+import { performArraySort } from "../utils/performArraySort.mjs";
 
 const { HandlebarsApplicationMixin, ApplicationV2 } = foundry.applications.api;
+const { DragDrop } = foundry.applications.ux;
 const { getDocumentClass } = foundry.utils;
 
 export class SidebarTabRearranger extends HandlebarsApplicationMixin(ApplicationV2) {
@@ -20,7 +22,8 @@ export class SidebarTabRearranger extends HandlebarsApplicationMixin(Application
 			closeOnSubmit: true,
 			submitOnChange: false,
 		},
-		actions: {},
+		actions: {
+		},
 	};
 
 	static PARTS = {
@@ -30,9 +33,33 @@ export class SidebarTabRearranger extends HandlebarsApplicationMixin(Application
 	// #endregion Options
 
 	// #region Instance Data
+	#order = [];
+
+	constructor(...args) {
+		super(...args);
+
+		// TODO: define this using the game settings
+		this.#order = Object.keys(ui.sidebar.constructor.TABS);
+	};
 	// #endregion Instance Data
 
 	// #region Lifecycle
+	async _onRender(...args) {
+		await super._onRender(...args);
+
+		new DragDrop.implementation({
+			dragSelector: `.tab`,
+			dropSelector: `.drop-zone`,
+			callbacks: {
+				dragstart: this.#onDragStart.bind(this),
+				dragenter: this.#onDragEnter.bind(this),
+				dragleave: this.#onDragLeave.bind(this),
+				dragend: this.#onDragEnd.bind(this),
+				drop: this.#onDrop.bind(this),
+			},
+		}).bind(this.element);
+	};
+
 	/** @this {SidebarTabRearranger} */
 	static async #onSubmit() {};
 	// #endregion Lifecycle
@@ -47,7 +74,11 @@ export class SidebarTabRearranger extends HandlebarsApplicationMixin(Application
 
 		const tabs = ui.sidebar.constructor.TABS;
 		ctx.tabs = [];
-		for (const [id, tab] of Object.entries(tabs)) {
+		for (let i = 0; i < this.#order.length; i++) {
+			const id = this.#order[i];
+			const tab = tabs[id];
+			if (!tab) { continue };
+
 			let { documentName, gmOnly, tooltip, icon } = tab;
 			if (gmOnly && !game.user.isGM) { continue };
 
@@ -60,6 +91,7 @@ export class SidebarTabRearranger extends HandlebarsApplicationMixin(Application
 				id,
 				name: game.i18n.localize(tooltip),
 				icon,
+				nextIndex: i + 1,
 			});
 		};
 
@@ -69,4 +101,64 @@ export class SidebarTabRearranger extends HandlebarsApplicationMixin(Application
 
 	// #region Actions
 	// #endregion Actions
+
+	// #region Drag & Drop
+	#onDragStart(event) {
+		/** @type {HTMLLIElement|undefined} */
+		const target = event.target.closest(`[data-tab-id]`);
+		if (!target) { return };
+
+		const tabID = target.dataset.tabId;
+
+		target.classList.add(`no-hover-styles`);
+		event.dataTransfer.setDragImage(target, 0, 0);
+		event.dataTransfer.setData(`oft/tab`, tabID);
+		target.closest(`.tab-list`)?.classList.add(`dragging`);
+
+		/*
+		This timeout is required to get the difference between the drag
+		image and the element in-DOM, because this puts the class removal
+		in a subsequent event cycle instead of being handled in the current
+		cycle.
+		*/
+		setTimeout(() => target.classList.remove(`no-hover-styles`), 0);
+	};
+
+	#onDragEnter(event) {
+		event.currentTarget.style.setProperty(`--colour`, `#00aa00`);
+	};
+
+	#onDragLeave(event) {
+		event.currentTarget.style.removeProperty(`--colour`);
+	};
+
+	#onDragEnd() {
+		this.element.querySelector(`.tab-list`)?.classList.remove(`dragging`);
+		this.element
+			.querySelectorAll(`[style="--colour: #00aa00"]`)
+			.forEach(el => el.style.removeProperty(`--colour`));
+	};
+
+	#onDrop(event) {
+		const droppedID = event.dataTransfer.getData(`oft/tab`);
+		this.element.querySelector(`.tab-list`)?.classList.remove(`dragging`);
+		event.currentTarget?.style?.removeProperty(`--colour`);
+		if (!droppedID) { return };
+
+		const droppedIndex = this.#order.findIndex(t => t === droppedID);
+		const dropTarget = event.currentTarget;
+		const targetIndex = parseInt(dropTarget?.dataset.moveToIndex);
+		if (
+			!dropTarget
+			|| droppedIndex < 0
+			|| targetIndex === droppedIndex
+		) { return };
+
+		this.#order = performArraySort(
+			droppedID,
+			{ targetIndex, list: this.#order },
+		);
+		this.render({ parts: [`list`] });
+	};
+	// #endregion Drag & Drop
 };

module/utils/performArraySort.mjs

@@ -0,0 +1,31 @@
+export function performArraySort(
+	element,
+	{ list, targetIndex },
+) {
+
+	// Case: same position
+	if (list.indexOf(el => el === element) === targetIndex) {
+		return Array.from(list);
+	};
+
+	// Case: start of array
+	if (targetIndex === 0) {
+		list = list.filter(el => el !== element);
+		return [element, ...list];
+	};
+
+	// Case: end of array
+	if (targetIndex === list.length - 1) {
+		list = list.filter(el => el !== element);
+		return [...list, element];
+	};
+
+	// Case: middle of array
+	const front = list
+		.slice(0, targetIndex)
+		.filter(el => el !== element);
+	const back = list
+		.slice(targetIndex)
+		.filter(el => el !== element);
+	return [...front, element, ...back];
+};

styles/apps/SidebarTabRearranger.css

@@ -1,19 +1,55 @@
 .oft.SidebarTabRearranger {
-	ol {
-		display: flex;
-		flex-direction: column;
+	> .window-content {
+		gap: 16px;
+	}
+
+	footer {
+		display: grid;
+		grid-template-columns: repeat(2, 1fr);
 		gap: 8px;
+	}
+
+	.drop-zone {
+		--colour: transparent;
+		background: color-mix(in srgb, var(--colour) 30%, transparent 70%);
+		border: 1px solid var(--colour);
+		border-radius: 4px;
+		transition: all 150ms ease-in-out;
+		width: 12px;
+	}
+
+	.tab-list {
+		display: flex;
+		flex-direction: row;
+		row-gap: 8px;
+		column-gap: 2px;
 		list-style-type: none;
 		margin: 0;
 		padding: 0;
+
+		&.dragging > .drop-zone {
+			--colour: #c9593f;
+		}
 	}
 
-	li {
+	.tab {
+		margin: 0;
 		display: flex;
-		flex-direction: row;
+		flex-direction: column;
 		align-items: center;
-		gap: 12px;
 		cursor: var(--cursor-grab);
+
+		> .drag-handle-icon {
+			display: none;
+		}
+		&:hover:not(.no-hover-styles) {
+			> .sidebar-icon {
+				display: none;
+			}
+			> .drag-handle-icon {
+				display: initial;
+			}
+		}
 	}
 
 	.emulate-button {
@@ -26,4 +62,8 @@
 		border: 1px solid var(--color-light-5);
 		border-radius: 4px;
 	}
+
+	.bottom-label {
+		text-align: right;
+	}
 }

templates/SidebarTabRearranger/footer.hbs

@@ -1,3 +1,14 @@
 <footer>
-	<button>Submit</button>
+	<button type="close">
+		{{ localize "OFT.apps.discard-changes" }}
+	</button>
+	<button>
+		<oft-icon
+			name="icons/save"
+			aria-hidden="true"
+			var:fill="currentColor"
+			var:size="1rem"
+		></oft-icon>
+		{{ localize "Save Changes" }}
+	</button>
 </footer>

templates/SidebarTabRearranger/list.hbs

@@ -1,15 +1,33 @@
 <main>
-	<ol>
+	<div class="top-label">
+		{{ localize "OFT.apps.SidebarTabRearranger.top" }}
+	</div>
+	<div class="tab-list" data-tooltip-direction="UP">
+		<div
+			class="drop-zone"
+			data-move-to-index="0"
+		></div>
 		{{#each tabs as | tab |}}
-			<li>
-				<span class="emulate-button {{tab.icon}}"></span>
-				<span>{{tab.name}}</span>
-				<div style="flex-grow: 1"></div>
+			<div
+				class="emulate-button tab"
+				data-tab-id="{{tab.id}}"
+				data-tooltip="{{tab.name}}"
+			>
+				<span class="sidebar-icon {{tab.icon}}"></span>
 				<oft-icon
+					class="drag-handle-icon"
 					name="icons/drag-handle"
-					var:fill="currentColor"
+					var:fill="color-mix(in srgb, currentColor 75%, black 25%)"
+					var:size="1rem"
 				></oft-icon>
-			</li>
+			</div>
+			<div
+				class="drop-zone"
+				data-move-to-index="{{tab.nextIndex}}"
+			></div>
 		{{/each}}
-	</ol>
+	</div>
+	<div class="bottom-label">
+		{{ localize "OFT.apps.SidebarTabRearranger.bottom" }}
+	</div>
 </main>