Make press hold and enabled togglable

[Folcon]

Hey @tonsky

I've been using HumbleUI to build a game and I just finished wiring up camera panning and realised that kPressAndHoldEnabled is on by default

JWM/macos/cc/JWMMainView.mm

Line 197 in dc1b898

kPressAndHoldEnabled = nullptr == [userDefaults objectForKey:@"ApplePressAndHoldEnabled"] ? YES : [userDefaults boolForKey:@"ApplePressAndHoldEnabled"];

This is useful so I'd like to propose adding a toggle so when keyboard input is required I can turn it on and when it's not like when I'm just wanting more raw keyboard input, I can turn it off

Feel free to correct me, I'm not familiar with calling native code from java and I've tried to fit your calling conventions

From what I can see this would involve modifying WindowMac.java and adding a method like:

public static void setPressAndHoldEnabled(boolean enabled) {
    assert _onUIThread() : "Should be run on UI thread";
    _nSetPressAndHoldEnabled(enabled);
}

As well as modifying WindowMac.mm to add:

extern "C" JNIEXPORT void JNICALL Java_io_github_humbleui_jwm_WindowMac__1nSetPressAndHoldEnabled
  (JNIEnv *env, jclass cls, jboolean enabled) {
    jwm::kPressAndHoldEnabled = enabled;
}

Let me know if you'd prefer me to do it some other way of if you don't think this is a good way to do it =)

Otherwise happy to whip up a PR

From what I can tell I'll also need to do some work with HumbleUI to update it to get it in line with the work you've been doing to update JMW so I can use this, I don't mind putting some time in for that as well

Really want to get back into doing some gamedev on HumbleUI again, your sand example was a good reminder that there's some fun stuff that can be done here!

[tonsky]

Yes, all sounds good, please make a PR. It’s quite handy that we already have the flag :)