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import { Accessor } from '../accessor';
import { InvalidAccessorDefinitionError } from '../error/invalid-accessor-definition';
import { MethodNotFoundError } from '../error/method-not-found';
import { IEvent } from '../event/interfaces';
import { Loader } from '../loader/loader';
import { IKeyMap, IKeyMapItem } from './interfaces';
/**
* Key Mapping
*/
export class KeyMap {
public static factory<T>(keyMapping: IKeyMap<T>): IKeyMap<T> {
const factoredKeyMap: IKeyMap<T> = {};
Object.keys(keyMapping).forEach((key) => {
const keyMap = { ...keyMapping[key] };
const { event } = keyMap;
factoredKeyMap[key] = keyMap as IKeyMapItem<T>;
if (event && Accessor.isAccessorDefinition(event)) {
const [controllerName, method] = Accessor.getAccessor(event as string);
factoredKeyMap[key].event = KeyMap.getEventMethod<T>(controllerName, method);
} else if (event && typeof event !== 'function') {
factoredKeyMap[key].event = () => {
throw new InvalidAccessorDefinitionError(event);
};
}
});
return factoredKeyMap;
}
private static getEventMethod<T>(controllerName: string, method: string): IEvent<T> {
const instance = Loader.getInstance(controllerName);
if (instance?.[method]) {
return instance[method].bind(instance);
}
return () => {
throw new MethodNotFoundError(method, controllerName);
};
}
private static documentInit = false;
private static listeners: any = {};
private static allModifiers = ['ctrl', 'shift', 'alt', 'meta'];
private static isMobile() {
const toMatch = [/Android/i, /webOS/i, /iPhone/i, /iPad/i, /iPod/i, /BlackBerry/i, /Windows Phone/i];
return toMatch.some((toMatchItem) => navigator.userAgent.match(toMatchItem));
}
private static isHotkeyValid(hotkey: string[]) {
return hotkey.filter((k) => KeyMap.allModifiers.indexOf(k) === -1).length === 1;
}
private static isMacPlatform() {
return /Mac|iPod|iPhone|iPad/.test(navigator.platform);
}
private static normalizeHotkey(key: string, validate = true) {
const hotkey = key.split(/ +/g).map((part) => {
const arr = part.split('+').filter(Boolean);
const result = [...new Set(arr)].map((item: string) => {
const aliases: any = {
option: 'alt',
command: 'meta',
escape: 'esc',
mod: KeyMap.isMacPlatform() ? 'meta' : 'ctrl',
};
return aliases[item] || item;
});
if (validate && result.length < arr.length) {
throw new Error(`Hotkey combination has duplicates "${key}"`);
}
if (validate && !KeyMap.isHotkeyValid(result)) {
throw new Error(`Invalid hotkey combination: "${key}"`);
}
return result;
});
return hotkey.map((keySeq) => keySeq.sort().join('+')).join(' ');
}
public static bind(keyMapping: IKeyMap, component: any = null, element: any = document) {
if (KeyMap.isMobile()) return;
if (!KeyMap.documentInit) {
KeyMap.initDocumentEvents();
}
Object.keys(keyMapping).forEach((item) => {
const hotkeyStr = KeyMap.normalizeHotkey(item);
const listener = KeyMap.listeners[hotkeyStr] || [];
listener.unshift({ ...keyMapping[item], component, element });
KeyMap.listeners[hotkeyStr] = listener;
});
}
public static unbind(keyMapping: IKeyMap, component: any = null) {
if (KeyMap.isMobile()) return;
Object.keys(keyMapping).forEach((item) => {
const hotkeyStr = KeyMap.normalizeHotkey(item);
if (KeyMap.listeners[hotkeyStr]?.length) {
const filterFn = (listener: any) =>
listener.event === keyMapping[item].event && listener.component === component;
const index = KeyMap.listeners[hotkeyStr].findIndex(filterFn);
if (index > -1) {
KeyMap.listeners[hotkeyStr].splice(index, 1);
}
if (!KeyMap.listeners[hotkeyStr].length) {
KeyMap.listeners[hotkeyStr] = undefined;
}
}
});
}
private static initDocumentEvents() {
KeyMap.documentInit = true;
const keyDownListener = KeyMap.createKeyDownListener();
document.addEventListener('keydown', keyDownListener.bind(KeyMap));
if (window.self === window.top) {
// if top window add listener to receive message from iframe
window.addEventListener('message', (event) => {
const { data } = event;
if (data.type === 'keymap_iframe_keydown') {
document.dispatchEvent(
new KeyboardEvent('keydown', {
key: data.message.key,
code: data.message.code,
repeat: data.message.repeat,
altKey: data.message.altKey,
metaKey: data.message.metaKey,
ctrlKey: data.message.ctrlKey,
shiftKey: data.message.shiftKey,
}),
);
}
});
}
}
private static isInputElementActive() {
const inputElements = ['INPUT', 'SELECT', 'TEXTAREA'];
const { activeElement } = document;
const isInput = activeElement && inputElements.indexOf(activeElement.nodeName) !== -1;
const isContentEditable = activeElement && (activeElement as any).isContentEditable;
return isInput || isContentEditable;
}
private static isSelectorActive(selector?: string): boolean {
if (!selector) {
return false;
}
const { activeElement } = document;
/* couldn't test for null activeElement */
/* istanbul ignore next */
return !!activeElement?.matches(selector);
}
/* there is no way to mock document.activeElement) */
/* istanbul ignore next */
private static isElementActive(element: any) {
return element.contains(document.activeElement);
}
private static isElementVisible(element: HTMLElement) {
return !!(element.offsetWidth || element.offsetHeight || element.getClientRects().length);
}
private static createKeyDownListener() {
let buffer: string[] = [];
const clearBufferDebounced = debounce(() => {
buffer = [];
}, 1000);
const callListeners = (event: KeyboardEvent, hotkey: string) =>
KeyMap.listeners[hotkey]
.sort((a: any, b: any) => {
if (a.index === undefined || a.index > b.index) return 1;
if (a.index === b.index) return 0;
return -1;
})
.some((listener: any) => {
const selectorCondition =
(!listener.input && KeyMap.isInputElementActive()) || KeyMap.isSelectorActive(listener.disabler);
if (selectorCondition) {
return false;
}
if (listener.active && listener.element && !KeyMap.isElementActive(listener.element)) {
return false;
}
if (listener.visible && !KeyMap.isElementVisible(listener.element)) {
return false;
}
if (listener.focus && listener.element) {
const focusableElements = 'button, [href], input, select, textarea, [tabindex]:not([tabindex="-1"])';
if (listener.element.matches(focusableElements)) {
listener.element.focus();
} else {
const focusableChildren = listener.element.querySelectorAll(focusableElements);
focusableChildren[0]?.focus();
}
}
if (listener.event) {
listener.event({ event, component: listener.component, element: listener.element });
}
if (listener.prevent !== false) {
event.preventDefault();
}
if (listener.stop) {
event.stopImmediatePropagation();
return true;
}
return false;
});
return (event: KeyboardEvent) => {
if (!(event instanceof KeyboardEvent)) return;
if (event.repeat || event.getModifierState(event.key)) return;
clearBufferDebounced();
const key = KeyMap.decodeKey(event);
const hotkey = KeyMap.normalizeHotkey(key, false);
buffer.push(hotkey);
let stopped = false;
if (KeyMap.listeners[hotkey]) {
stopped = callListeners(event, hotkey);
}
const bufferStr = buffer.join(' ');
if (!stopped && buffer.length > 1) {
Object.keys(KeyMap.listeners).forEach((item: string) => {
if (item.indexOf(' ') !== -1 && bufferStr.endsWith(item)) {
callListeners(event, item);
}
});
}
if (!stopped && window.self !== window.top && window.parent) {
// if inside a iframe send message to top window
window.parent.postMessage(
{
type: 'keymap_iframe_keydown',
message: {
key: event.key,
altKey: event.altKey,
metaKey: event.metaKey,
ctrlKey: event.ctrlKey,
shiftKey: event.shiftKey,
code: event.code,
repeat: event.repeat,
},
},
'*',
);
}
};
}
private static decodeKey(event: KeyboardEvent) {
const k: string[] = [];
if (event.key === 'Shift' || event.shiftKey) k.push('shift');
if (event.key === 'Control' || event.ctrlKey) k.push('ctrl');
if (event.key === 'Meta' || event.metaKey) k.push('meta');
if (event.key === 'Alt' || event.altKey) k.push('alt');
const keyMapping: any = {
backspace: 'backspace',
tab: 'tab',
enter: 'enter',
shift: 'shift',
shiftleft: 'shift',
shiftright: 'shift',
control: 'ctrl',
controlleft: 'ctrl',
controlright: 'ctrl',
alt: 'alt',
altleft: 'alt',
altright: 'alt',
meta: 'meta',
metaleft: 'meta',
metaright: 'meta',
capslock: 'capslock',
escape: 'esc',
space: 'space',
pageup: 'pageup',
pagedown: 'pagedown',
end: 'end',
home: 'home',
arrowleft: 'left',
arrowup: 'up',
arrowright: 'right',
arrowdown: 'down',
insert: 'insert',
delete: 'del',
pause: 'pause',
printscreen: 'printscreen',
contextmenu: 'contextmenu',
numlock: 'numlock',
scrolllock: 'scrolllock',
'+': 'plus',
semicolon: ';',
equal: '=',
comma: ',',
minus: '-',
period: '.',
slash: '/',
backquote: '`',
bracketleft: '[',
backslash: '\\',
bracketright: ']',
quote: "'",
};
if (keyMapping[event.code.toLowerCase()]) {
k.push(keyMapping[event.code.toLowerCase()]);
} else if (/F\d{1,2}|\//g.test(event.code)) {
k.push(event.code.toLowerCase());
} else if (event.code.substring(0, 3) === 'Key') {
k.push(event.code.substring(3).toLowerCase());
} else if (event.code.substring(0, 5) === 'Digit') {
k.push(event.code.substring(5).toLowerCase());
} else if (event.code.substring(0, 6) === 'Numpad') {
k.push(event.key.toLowerCase());
} else {
k.push(event.key.toLowerCase());
}
return [...new Set(k)].join('+');
}
}
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