Add simple implementation of a KeyBindingsManager + match tests
Clemens Zeidler
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7865f15ac2
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c7f9defd12
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import { isMac } from "./Keyboard";
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export enum KeyBindingContext {
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}
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export enum KeyAction {
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None = 'None',
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}
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/**
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* Represent a key combination.
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*
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* The combo is evaluated strictly, i.e. the KeyboardEvent must match the exactly what is specified in the KeyCombo.
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*/
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export type KeyCombo = {
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/** Currently only one `normal` key is supported */
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keys: string[];
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/** On PC: ctrl is pressed; on Mac: meta is pressed */
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ctrlOrCmd?: boolean;
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altKey?: boolean;
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ctrlKey?: boolean;
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metaKey?: boolean;
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shiftKey?: boolean;
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}
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export type KeyBinding = {
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keyCombo: KeyCombo;
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action: KeyAction;
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}
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/**
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* Helper method to check if a KeyboardEvent matches a KeyCombo
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*
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* Note, this method is only exported for testing.
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*/
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export function isKeyComboMatch(ev: KeyboardEvent, combo: KeyCombo, onMac: boolean): boolean {
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if (combo.keys.length > 0 && ev.key !== combo.keys[0]) {
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return false;
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}
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const comboCtrl = combo.ctrlKey ?? false;
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const comboAlt = combo.altKey ?? false;
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const comboShift = combo.shiftKey ?? false;
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const comboMeta = combo.metaKey ?? false;
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// When ctrlOrCmd is set, the keys need do evaluated differently on PC and Mac
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if (combo.ctrlOrCmd) {
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if (onMac) {
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if (!ev.metaKey
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|| ev.ctrlKey !== comboCtrl
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|| ev.altKey !== comboAlt
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|| ev.shiftKey !== comboShift) {
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return false;
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}
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} else {
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if (!ev.ctrlKey
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|| ev.metaKey !== comboMeta
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|| ev.altKey !== comboAlt
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|| ev.shiftKey !== comboShift) {
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return false;
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}
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}
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return true;
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}
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if (ev.metaKey !== comboMeta
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|| ev.ctrlKey !== comboCtrl
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|| ev.altKey !== comboAlt
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|| ev.shiftKey !== comboShift) {
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return false;
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}
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return true;
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}
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export class KeyBindingsManager {
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contextBindings: Record<KeyBindingContext, KeyBinding[]> = {};
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/**
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* Finds a matching KeyAction for a given KeyboardEvent
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*/
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getAction(context: KeyBindingContext, ev: KeyboardEvent): KeyAction {
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const bindings = this.contextBindings[context];
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if (!bindings) {
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return KeyAction.None;
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}
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const binding = bindings.find(it => isKeyComboMatch(ev, it.keyCombo, isMac));
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if (binding) {
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return binding.action;
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}
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return KeyAction.None;
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}
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}
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const manager = new KeyBindingsManager();
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export function getKeyBindingsManager(): KeyBindingsManager {
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return manager;
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}
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@ -0,0 +1,137 @@
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import { isKeyComboMatch, KeyCombo } from '../src/KeyBindingsManager';
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const assert = require('assert');
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function mockKeyEvent(key: string, modifiers?: {
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ctrlKey?: boolean,
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altKey?: boolean,
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shiftKey?: boolean,
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metaKey?: boolean
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}): KeyboardEvent {
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return {
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key,
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ctrlKey: modifiers?.ctrlKey ?? false,
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altKey: modifiers?.altKey ?? false,
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shiftKey: modifiers?.shiftKey ?? false,
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metaKey: modifiers?.metaKey ?? false
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} as KeyboardEvent;
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}
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describe('KeyBindingsManager', () => {
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it('should match basic key combo', () => {
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const combo1: KeyCombo = {
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keys: ['k'],
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};
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('k'), combo1, false), true);
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('n'), combo1, false), false);
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});
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it('should match key + modifier key combo', () => {
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const combo: KeyCombo = {
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keys: ['k'],
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ctrlKey: true,
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};
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('k', { ctrlKey: true }), combo, false), true);
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('n', { ctrlKey: true }), combo, false), false);
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('k'), combo, false), false);
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('k', { shiftKey: true }), combo, false), false);
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('k', { shiftKey: true, metaKey: true }), combo, false), false);
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const combo2: KeyCombo = {
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keys: ['k'],
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metaKey: true,
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};
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('k', { metaKey: true }), combo2, false), true);
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('n', { metaKey: true }), combo2, false), false);
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('k'), combo2, false), false);
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('k', { altKey: true, metaKey: true }), combo2, false), false);
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const combo3: KeyCombo = {
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keys: ['k'],
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altKey: true,
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};
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('k', { altKey: true }), combo3, false), true);
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('n', { altKey: true }), combo3, false), false);
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('k'), combo3, false), false);
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('k', { ctrlKey: true, metaKey: true }), combo3, false), false);
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const combo4: KeyCombo = {
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keys: ['k'],
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shiftKey: true,
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};
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('k', { shiftKey: true }), combo4, false), true);
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('n', { shiftKey: true }), combo4, false), false);
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('k'), combo4, false), false);
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('k', { shiftKey: true, ctrlKey: true }), combo4, false), false);
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});
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it('should match key + multiple modifiers key combo', () => {
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const combo: KeyCombo = {
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keys: ['k'],
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ctrlKey: true,
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altKey: true,
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};
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('k', { ctrlKey: true, altKey: true }), combo, false), true);
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('n', { ctrlKey: true, altKey: true }), combo, false), false);
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('k', { ctrlKey: true, metaKey: true }), combo, false), false);
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('k', { ctrlKey: true, metaKey: true, shiftKey: true }), combo,
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false), false);
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const combo2: KeyCombo = {
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keys: ['k'],
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ctrlKey: true,
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shiftKey: true,
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altKey: true,
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};
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('k', { ctrlKey: true, shiftKey: true, altKey: true }), combo2,
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false), true);
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('n', { ctrlKey: true, shiftKey: true, altKey: true }), combo2,
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false), false);
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('k', { ctrlKey: true, metaKey: true }), combo2, false), false);
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('k',
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{ ctrlKey: true, shiftKey: true, altKey: true, metaKey: true }), combo2, false), false);
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const combo3: KeyCombo = {
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keys: ['k'],
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ctrlKey: true,
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shiftKey: true,
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altKey: true,
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metaKey: true,
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};
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('k',
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{ ctrlKey: true, shiftKey: true, altKey: true, metaKey: true }), combo3, false), true);
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('n',
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{ ctrlKey: true, shiftKey: true, altKey: true, metaKey: true }), combo3, false), false);
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('k',
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{ ctrlKey: true, shiftKey: true, altKey: true }), combo3, false), false);
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});
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it('should match ctrlOrMeta key combo', () => {
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const combo: KeyCombo = {
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keys: ['k'],
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ctrlOrCmd: true,
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};
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// PC:
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('k', { ctrlKey: true }), combo, false), true);
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('k', { metaKey: true }), combo, false), false);
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('n', { ctrlKey: true }), combo, false), false);
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// MAC:
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('k', { metaKey: true }), combo, true), true);
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('k', { ctrlKey: true }), combo, true), false);
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('n', { ctrlKey: true }), combo, true), false);
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});
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it('should match advanced ctrlOrMeta key combo', () => {
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const combo: KeyCombo = {
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keys: ['k'],
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ctrlOrCmd: true,
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altKey: true,
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};
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// PC:
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('k', { ctrlKey: true, altKey: true }), combo, false), true);
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('k', { metaKey: true, altKey: true }), combo, false), false);
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// MAC:
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('k', { metaKey: true, altKey: true }), combo, true), true);
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assert.strictEqual(isKeyComboMatch(mockKeyEvent('k', { ctrlKey: true, altKey: true }), combo, true), false);
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});
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});
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