getCallbackHandle static method
- Function callback
Get a handle to a named top-level or static callback function which can be easily passed between isolates.
The callback
argument must not be null.
Returns a CallbackHandle that can be provided to
PluginUtilities.getCallbackFromHandle to retrieve a tear-off of the
original callback. If callback
is not a top-level or static function,
null is returned.
Implementation
static CallbackHandle? getCallbackHandle(Function callback) {
return _forwardCache.putIfAbsent(callback, () {
final int? handle = _getCallbackHandle(callback);
return handle != null ? CallbackHandle.fromRawHandle(handle) : null;
});
}