Implement the Attribute sheet for editing

module/apps/AttributeItemSheet.mjs

@@ -0,0 +1,75 @@
+import { __ID__, filePath } from "../consts.mjs";
+import { TAFDocumentSheetMixin } from "./mixins/TAFDocumentSheetMixin.mjs";
+
+const { HandlebarsApplicationMixin } = foundry.applications.api;
+const { ItemSheetV2 } = foundry.applications.sheets;
+const { setProperty } = foundry.utils;
+
+export class AttributeItemSheet extends
+	TAFDocumentSheetMixin(
+	HandlebarsApplicationMixin(
+	ItemSheetV2,
+)) {
+	// #region Options
+	static DEFAULT_OPTIONS = {
+		classes: [
+			__ID__,
+			`AttributeItemSheet`,
+		],
+		position: {
+			width: 350,
+			height: `auto`,
+		},
+		window: {
+			resizable: true,
+		},
+		form: {
+			submitOnChange: true,
+			closeOnSubmit: false,
+		},
+		actions: {},
+	};
+
+	static PARTS = {
+		header: { template: filePath(`templates/AttributeItemSheet/header.hbs`) },
+		value: { template: filePath(`templates/AttributeItemSheet/value.hbs`) },
+		settings: { template: filePath(`templates/AttributeItemSheet/settings.hbs`) },
+	};
+
+	/**
+	 * This tells the Application's TAFDocumentSheetMixin how to rerender
+	 * this app when specific properties get changed on the actor, so that
+	 * it doesn't need to full-app rendering if we can do a partial
+	 * rerender instead.
+	 */
+	static PROPERTY_TO_PARTIAL = {
+		"name": [`header`],
+		"system.value": [`value`],
+		"system.min": [`value`],
+		"system.max": [`value`],
+		"system.aboveTheFold": [`settings`],
+		"system.group": [`settings`],
+		"system.key": [`settings`],
+	};
+	// #endregion Options
+
+	// #region Instance Data
+	// #endregion Instance Data
+
+	// #region Lifecycle
+	async _prepareContext() {
+		return {
+			meta: {
+				idp: this.id,
+				editable: this.isEditable,
+				limited: this.isLimited,
+			},
+			item: this.item,
+			system: this.item.system,
+		};
+	};
+	// #endregion Lifecycle
+
+	// #region Actions
+	// #endregion Actions
+};