@nativescript/core
Version:
A JavaScript library providing an easy to use api for interacting with iOS and Android platform APIs.
75 lines • 2.53 kB
JavaScript
/**
* Android specific timer functions implementation.
*/
let timeoutHandler;
const timeoutCallbacks = {};
// this is needed to keep a strong reference to the callback
// currently fixes a race condition in V8 with the android runtime implementation of WeakRef
// there are fixes in the android runtime that will remove the need for this
const timeoutCallbacksCb = {};
let timerId = 0;
function createHandlerAndGetId() {
if (!timeoutHandler) {
timeoutHandler = new android.os.Handler(android.os.Looper.myLooper());
}
timerId++;
return timerId;
}
export function setTimeout(callback, milliseconds = 0, ...args) {
// Cast to Number
milliseconds += 0;
const id = createHandlerAndGetId();
const invoke = () => callback(...args);
const zoneBound = zonedCallback(invoke);
const runnable = new java.lang.Runnable({
run: () => {
zoneBound();
if (timeoutCallbacks[id]) {
delete timeoutCallbacks[id];
delete timeoutCallbacksCb[id];
}
},
});
if (!timeoutCallbacks[id]) {
timeoutCallbacks[id] = runnable;
timeoutCallbacksCb[id] = callback;
}
timeoutHandler.postDelayed(runnable, long(milliseconds));
return id;
}
export function clearTimeout(id) {
const index = id;
if (timeoutCallbacks[index]) {
timeoutHandler.removeCallbacks(timeoutCallbacks[index]);
delete timeoutCallbacks[index];
delete timeoutCallbacksCb[index];
}
}
export function setInterval(callback, milliseconds = 0, ...args) {
// Cast to Number
milliseconds += 0;
const id = createHandlerAndGetId();
const handler = timeoutHandler;
const invoke = () => callback(...args);
const zoneBound = zonedCallback(invoke);
const startOffset = milliseconds > 0 ? Date.now() % milliseconds : 0;
function nextCallMs() {
return milliseconds > 0 ? milliseconds - ((Date.now() - startOffset) % milliseconds) : milliseconds;
}
const runnable = new java.lang.Runnable({
run: () => {
zoneBound();
if (timeoutCallbacks[id]) {
handler.postDelayed(runnable, long(nextCallMs()));
}
},
});
if (!timeoutCallbacks[id]) {
timeoutCallbacks[id] = runnable;
timeoutCallbacksCb[id] = callback;
}
timeoutHandler.postDelayed(runnable, long(nextCallMs()));
return id;
}
export const clearInterval = clearTimeout;
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