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authortoasted-nutbread <toasted-nutbread@users.noreply.github.com>2020-08-23 12:43:53 -0400
committerGitHub <noreply@github.com>2020-08-23 12:43:53 -0400
commit934355dd09aa8b7e8993759b678af063b56b9fc6 (patch)
treecf08d4559a455686dd86c52a543ab6868b6c5df9 /ext
parent1ab853a4d5bb0fdfe329282be2ae213ec1563252 (diff)
Add promiseAnimationFrame function (#752)
Diffstat (limited to 'ext')
-rw-r--r--ext/mixed/js/core.js28
1 files changed, 28 insertions, 0 deletions
diff --git a/ext/mixed/js/core.js b/ext/mixed/js/core.js
index 5bee4670..c5c6fef2 100644
--- a/ext/mixed/js/core.js
+++ b/ext/mixed/js/core.js
@@ -258,6 +258,34 @@ function promiseTimeout(delay, resolveValue) {
return promise;
}
+function promiseAnimationFrame(timeout=null) {
+ return new Promise((resolve) => {
+ let timer = null;
+ let frameRequest = null;
+ const onFrame = (time) => {
+ frameRequest = null;
+ if (timer !== null) {
+ clearTimeout(timer);
+ timer = null;
+ }
+ resolve({time, timeout: false});
+ };
+ const onTimeout = () => {
+ timer = null;
+ if (frameRequest !== null) {
+ cancelAnimationFrame(frameRequest);
+ frameRequest = null;
+ }
+ resolve({time: timeout, timeout: true});
+ };
+
+ frameRequest = requestAnimationFrame(onFrame);
+ if (typeof timeout === 'number') {
+ timer = setTimeout(onTimeout, timeout);
+ }
+ });
+}
+
/*
* Common classes