debugLockDelegate method Null safety
- BuildContext context
override
This is called by PlatformMenuBar when it is initialized, to be sure that only one is active at a time.
The debugLockDelegate
function should be called before the first call to
setMenus.
If the lock is successfully acquired, debugLockDelegate
will return
true.
If your implementation of a PlatformMenuDelegate can have only limited active instances, enforce it when you override this function.
See also:
- debugUnlockDelegate, where the delegate is unlocked.
Implementation
@override
bool debugLockDelegate(BuildContext context) {
assert(() {
// It's OK to lock if the lock isn't set, but not OK if a different
// context is locking it.
if (_lockedContext != null && _lockedContext != context) {
return false;
}
_lockedContext = context;
return true;
}());
return true;
}