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export class Trigger {
constructor(public open: string, public close?: string) {
if (!close) {
this.close = open;
}
}
public isManual() { return this.open === 'manual' || this.close === 'manual'; }
}
const DEFAULT_ALIASES = {
hover: ['mouseenter', 'mouseleave']
};
export function parseTriggers(triggers: string, aliases = DEFAULT_ALIASES): Trigger[] {
const trimmedTriggers = (triggers || '').trim();
if (trimmedTriggers.length === 0) {
return [];
}
const parsedTriggers = trimmedTriggers.split(/\s+/).map(trigger => trigger.split(':')).map((triggerPair) => {
let alias = aliases[triggerPair[0]] || triggerPair;
return new Trigger(alias[0], alias[1]);
});
const manualTriggers = parsedTriggers.filter(triggerPair => triggerPair.isManual());
if (manualTriggers.length > 1) {
throw 'Triggers parse error: only one manual trigger is allowed';
}
if (manualTriggers.length === 1 && parsedTriggers.length > 1) {
throw 'Triggers parse error: manual trigger can\'t be mixed with other triggers';
}
return parsedTriggers;
}
const noopFn = () => {
// TO DO
};
export function listenToTriggers(renderer: any, nativeElement: any, triggers: string, openFn, closeFn, toggleFn) {
const parsedTriggers = parseTriggers(triggers);
const listeners = [];
if (parsedTriggers.length === 1 && parsedTriggers[0].isManual()) {
return noopFn;
}
parsedTriggers.forEach((trigger: Trigger) => {
if (trigger.open === trigger.close) {
listeners.push(renderer.listen(nativeElement, trigger.open, toggleFn));
} else {
listeners.push(
renderer.listen(nativeElement, trigger.open, openFn), renderer.listen(nativeElement, trigger.close, closeFn));
}
});
return () => { listeners.forEach(unsubscribeFn => unsubscribeFn()); };
}
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