Key binds for #26

src/modals/SelectModal.ts

@@ -1,5 +1,6 @@
 import {App, Modal, Setting} from 'obsidian';
 import {SelectModalElement} from './SelectModalElement';
+import {mod} from '../utils/Utils';
 
 export abstract class SelectModal<T> extends Modal {
 	allowMultiSelect: boolean;
@@ -22,6 +23,17 @@ export abstract class SelectModal<T> extends Modal {
 
 		this.elements = elements;
 		this.selectModalElements = [];
+
+		this.scope.register([], 'ArrowUp', () => {
+			this.highlightUp();
+		});
+		this.scope.register([], 'ArrowDown', () => {
+			this.highlightDown();
+		});
+		this.scope.register([], 'ArrowRight', () => {
+			this.activateHighlighted();
+		});
+		this.scope.register([], 'Enter', () => this.submit());
 	}
 
 	abstract renderElement(value: T, el: HTMLElement): any;
@@ -38,6 +50,14 @@ export abstract class SelectModal<T> extends Modal {
 		}
 	}
 
+	deHighlightAllOtherElements(elementId: number) {
+		for (const selectModalElement of this.selectModalElements) {
+			if (selectModalElement.id !== elementId) {
+				selectModalElement.setHighlighted(false);
+			}
+		}
+	}
+
 	async onOpen() {
 		const {contentEl} = this;
 
@@ -72,4 +92,54 @@ export abstract class SelectModal<T> extends Modal {
 		}
 		bottomSetting.addButton(btn => btn.setButtonText('Ok').setCta().onClick(() => this.submit()));
 	}
+
+	activateHighlighted() {
+		for (const selectModalElement of this.selectModalElements) {
+			if (selectModalElement.isHighlighted()) {
+				selectModalElement.setActive(!selectModalElement.isActive());
+				if (!this.allowMultiSelect) {
+					this.disableAllOtherElements(selectModalElement.id);
+				}
+			}
+		}
+	}
+
+	highlightUp() {
+		for (const selectModalElement of this.selectModalElements) {
+			if (selectModalElement.isHighlighted()) {
+				this.getPreviousSelectModalElement(selectModalElement).setHighlighted(true);
+				return;
+			}
+		}
+
+		// nothing is highlighted
+		this.selectModalElements.last().setHighlighted(true);
+	}
+
+	highlightDown() {
+		for (const selectModalElement of this.selectModalElements) {
+			if (selectModalElement.isHighlighted()) {
+				this.getNextSelectModalElement(selectModalElement).setHighlighted(true);
+				return;
+			}
+		}
+
+		// nothing is highlighted
+		this.selectModalElements.first().setHighlighted(true);
+	}
+
+	private getNextSelectModalElement(selectModalElement: SelectModalElement<T>): SelectModalElement<T> {
+		let nextId = selectModalElement.id + 1;
+		nextId = mod(nextId, this.selectModalElements.length);
+
+		return this.selectModalElements.filter(x => x.id === nextId).first();
+	}
+
+	private getPreviousSelectModalElement(selectModalElement: SelectModalElement<T>): SelectModalElement<T> {
+		let nextId = selectModalElement.id - 1;
+		nextId = mod(nextId, this.selectModalElements.length);
+
+		return this.selectModalElements.filter(x => x.id === nextId).first();
+	}
+
 }

src/modals/SelectModalElement.ts

@@ -9,6 +9,7 @@ export class SelectModalElement<T> {
 	activeClass: string;
 	hoverClass: string;
 	private active: boolean;
+	private highlighted: boolean;
 
 	constructor(value: T, parentElement: HTMLElement, id: number, selectModal: SelectModal<T>, active: boolean = false) {
 		this.value = value;
@@ -29,21 +30,35 @@ export class SelectModalElement<T> {
 			}
 		});
 		this.element.on('mouseenter', '#' + this.getHTMLId(), () => {
-			this.addClass(this.hoverClass);
+			this.setHighlighted(true);
 		});
 		this.element.on('mouseleave', '#' + this.getHTMLId(), () => {
-			this.removeClass(this.hoverClass);
+			this.setHighlighted(false);
 		});
 	}
 
-	isActive(): boolean {
-		return this.active;
-	}
-
 	getHTMLId(): string {
 		return `media-db-plugin-select-element-${this.id}`;
 	}
 
+	isHighlighted(): boolean {
+		return this.highlighted;
+	}
+
+	setHighlighted(value: boolean) {
+		this.highlighted = value;
+		if (this.highlighted) {
+			this.addClass(this.hoverClass);
+			this.selectModal.deHighlightAllOtherElements(this.id);
+		} else {
+			this.removeClass(this.hoverClass);
+		}
+	}
+
+	isActive(): boolean {
+		return this.active;
+	}
+
 	setActive(active: boolean): void {
 		this.active = active;
 		this.update();

src/utils/Utils.ts

@@ -164,3 +164,8 @@ export class UserSkipError extends Error {
 	}
 }
 
+// js can't even implement modulo correctly...
+export function mod(n: number, m: number): number {
+	return ((n % m) + m) % m;
+}
+

src/utils/YAMLConverter.ts

@@ -10,6 +10,10 @@ export class YAMLConverter {
 	}
 
 	private static toYamlString(value: any, indentation: number): string {
+		if (value == null) {
+			return 'null';
+		}
+
 		if (typeof value === 'boolean') {
 			return value ? 'true' : 'false';
 		} else if (typeof value === 'number') {