WEBVTT 00:00.110 --> 00:01.130 Welcome. 00:01.130 --> 00:02.780 Now, this lecture is all. 00:02.780 --> 00:09.170 Quest You're going to make callbacks for the mana changes, just like we did for health changes. 00:09.170 --> 00:12.350 So create the callbacks just like we did for health. 00:12.350 --> 00:19.160 And after you do that, you're going to bind the callbacks, just like we did for health. 00:19.160 --> 00:22.370 So do that and change the effect. 00:22.370 --> 00:28.910 Actor so that when we get the potion, it'll subtract from mana as well as health and then play test. 00:28.940 --> 00:37.160 So go ahead, pause the video, tackle this quest and set up your system to respond to manage changes. 00:37.160 --> 00:42.550 And don't forget, you may have to go into Blueprint and do some things there as well. 00:42.560 --> 00:43.730 And guess what? 00:43.730 --> 00:50.660 There are a number of other steps involved in this challenge that I'm not going to tell you outright. 00:50.660 --> 00:57.110 This is going to be a little bit more of a challenge to see if you can remember all the different things 00:57.110 --> 01:03.210 involved and create those things, add those things, implement those things. 01:03.210 --> 01:07.650 So this one is going to be stretching your brain just a little bit. 01:07.800 --> 01:08.370 All right. 01:08.370 --> 01:09.360 Best of luck. 01:09.390 --> 01:11.790 Pause the video and conquer this. 01:14.880 --> 01:15.510 All right. 01:15.510 --> 01:17.100 So first we need some callbacks. 01:17.100 --> 01:21.700 Let's go into overlay widget controller and make those callbacks. 01:21.720 --> 01:28.650 Now, these are going to be for when mana changes, so I'm going to make void Mana changed and it'll 01:28.650 --> 01:31.080 have the same exact function signature. 01:31.200 --> 01:35.550 So I'll go ahead and paste that there and I'll also have a void. 01:35.550 --> 01:46.050 Max Mana changed and again with the same exact function signature as the others and I'm going to go 01:46.050 --> 01:55.260 ahead and generate the definitions for these like so and we're going to need some delegates to broadcast. 01:55.260 --> 02:02.610 So let's go up to where we declared these delegates and we're going to do the exact same thing only 02:02.610 --> 02:10.140 instead of on health changed signature, I'm going to make an on mana changed signature and this will 02:10.140 --> 02:20.440 be float new mana and the next one will be on max mana change signature and the float will be called 02:20.440 --> 02:21.730 New Max Mana. 02:23.020 --> 02:28.120 And we'll make these delegates right here just like we did for health. 02:28.120 --> 02:37.090 So I'm going to go ahead and paste them and change this to on Mana changed signature and I'll call this 02:37.090 --> 02:46.420 on Mana changed and this one will be on max Mana changed signature called on max Mana changed. 02:46.900 --> 02:48.880 So now we have the delegates. 02:49.030 --> 02:56.350 Okay so now in the CPP file for mana change and max mana change, we want to broadcast these. 02:56.350 --> 03:03.490 So we're going to say on mana changed dot broadcast and we're going to get data dot new value. 03:03.580 --> 03:05.170 Simple as that. 03:05.290 --> 03:15.040 And for max mana change it'll be on max mana changed dot broadcast data dot new value and now we'll 03:15.040 --> 03:21.880 be broadcasting those values whenever our mana changed and max mana changed functions are called. 03:21.880 --> 03:23.530 Well, when are those called? 03:23.560 --> 03:27.130 Well, they're called in response to the mana changing. 03:27.130 --> 03:32.320 As long as we bind them to the delegates on the ability system component here. 03:32.320 --> 03:34.180 So we need to do that as well. 03:34.180 --> 03:36.190 So I'm going to copy these lines. 03:36.460 --> 03:42.460 Paste And the attribute is going to be get mana attribute. 03:42.490 --> 03:48.250 That's the accessor we're calling and the callback will be mana changed. 03:48.280 --> 03:50.140 So that's for when mana changes. 03:50.140 --> 03:55.510 But we also want to do this for max Mana, so we'll paste it and instead of mana attribute we're going 03:55.510 --> 04:01.350 to get max mana attribute and we're going to bind to max Mana changed, right? 04:01.360 --> 04:07.060 So there's a few moving parts to this whole thing, but it's actually quite simple when the attribute 04:07.060 --> 04:13.930 itself changes the ability system component broadcast a delegate which are widget controller subscribes 04:13.930 --> 04:14.580 to. 04:14.580 --> 04:20.640 So in response, our widget controllers callbacks will be called, and in those callbacks we broadcast 04:20.640 --> 04:25.260 a delegate of our own to which our widget can subscribe. 04:25.260 --> 04:29.490 So we're going to go ahead and subscribe to that in the widget blueprint. 04:30.180 --> 04:39.030 Now, before we set all that up, let's just go into our aura effect actor wkRP, and we want to set 04:39.030 --> 04:40.110 our mana. 04:40.110 --> 04:45.630 So I'm going to copy this line where we're setting the health equal to its self plus 25. 04:45.630 --> 04:48.240 I'm going to call set mana as well. 04:48.240 --> 04:55.170 So set mana equal to get mana and we'll subtract 25. 04:55.260 --> 05:03.030 So now our aura effect actor should subtract from the mana and we're just about ready to set up our 05:03.030 --> 05:04.470 stuff in blueprint. 05:04.470 --> 05:11.010 But we do also want to make sure that our widget controller will broadcast the initial values for the 05:11.010 --> 05:11.760 mana. 05:11.760 --> 05:18.880 So in addition to on health change and on max health change, we should also broadcast for our mana 05:18.880 --> 05:19.390 as well. 05:19.390 --> 05:24.610 So we're going to say on mana changed dot broadcast. 05:25.370 --> 05:28.310 Or an attribute set and we'll call git mana. 05:29.570 --> 05:33.980 And we can say on Max Mana changed broadcast. 05:36.270 --> 05:38.010 Or attribute set. 05:39.560 --> 05:40.520 Get Max Mana. 05:44.230 --> 05:49.240 So now that way it should start at the appropriate value. 05:49.540 --> 05:55.600 And just quickly checking the attribute set, it starts at 50 and its max is 50, so it should start 05:55.600 --> 06:02.860 off full so I can go ahead and hit debug and we can tie this all together in blueprint and we should 06:02.860 --> 06:05.830 be able to see a full mana globe. 06:05.830 --> 06:11.260 And when we hit that health potion we should see the mana go down by 25. 06:11.260 --> 06:17.020 But we do need to subscribe to the delegates in the Mana Globe widget blueprint. 06:17.020 --> 06:28.300 So we're going to do that now so we can go into Blueprints UI Progress Bar WP manage Globe widget Blueprint. 06:28.420 --> 06:35.290 And here what we have to do is use event widget controller set. 06:35.290 --> 06:38.200 At this point we know our widget controller has been set. 06:38.230 --> 06:40.030 We can get that widget controller. 06:41.660 --> 06:47.150 We can cast it to BP Overlay widget controller. 06:47.150 --> 06:52.490 That's the kind we need to cast to in order to get those delegates we want to bind to. 06:52.490 --> 06:56.120 And I'm going to go ahead and promote that to a variable. 06:56.760 --> 07:01.140 Called BP Overlay Widget Controller. 07:02.620 --> 07:05.170 Just like we did over in the health globe. 07:05.170 --> 07:11.680 And I'll comment this and say set widget controller and we'll put that up here. 07:12.350 --> 07:13.910 I'm going to move these things over. 07:14.560 --> 07:18.700 And I think I'd like to make a sequence just like I did in the Health globe. 07:18.700 --> 07:26.290 So I'm going to use a sequence and I'm going to take my BP overlay widget controller drag off of that 07:26.290 --> 07:28.150 and search for manage changed. 07:28.150 --> 07:31.660 And I'm going to assign on manage changed here. 07:31.780 --> 07:33.910 So I'll drag that out. 07:33.940 --> 07:42.190 And while I'm at it, I'm going to duplicate this and add a then to and from my duplicate of the widget 07:42.190 --> 07:42.700 controller. 07:42.700 --> 07:47.400 I'm going to search for Max, manage changed and assign an event to that. 07:47.410 --> 07:49.870 So we'll go ahead and hook that up as well. 07:50.540 --> 07:55.730 And this will be similar to what we did in the health globe. 07:55.730 --> 08:01.560 Namely, we want to promote these mana values to variables, right? 08:01.580 --> 08:06.230 So when mana changes, my unmanaged changed event will be called. 08:06.230 --> 08:12.170 I'm going to promote the value broadcast from the widget controller and call this mana. 08:12.170 --> 08:18.290 And when Max mana changes, I'm going to promote the value passed in and call it max mana. 08:18.710 --> 08:28.430 So now we have mana and max mana and now we can simply call that inherited function set progress bar 08:28.430 --> 08:29.420 percent. 08:30.140 --> 08:31.700 Which takes a percent. 08:32.360 --> 08:34.340 We're going to divide mana by Max Mana. 08:34.340 --> 08:35.510 So here's Mana. 08:35.540 --> 08:37.070 Here's Max Mana. 08:37.100 --> 08:39.620 I'm going to do a safe divide. 08:41.520 --> 08:42.720 And hook that in. 08:43.050 --> 08:44.880 I'm going to copy these. 08:45.570 --> 08:46.990 Paste them down here. 08:47.010 --> 08:50.450 Actually, I can copy the function call as well. 08:50.460 --> 08:54.550 Ctrl D there and pass that in like so. 08:54.570 --> 08:56.730 And now we're setting our mana. 08:56.730 --> 09:00.030 Whenever it changes, we can compile that. 09:00.330 --> 09:00.870 Excellent. 09:00.870 --> 09:09.090 Let's go ahead and save all and press play and I see a full mana globe just as I expected. 09:09.090 --> 09:17.490 And as I pick up the health potion, we should see health go up to 75% and mana is at 50. 09:17.520 --> 09:17.910 Right. 09:17.910 --> 09:19.050 It has a max of 50. 09:19.080 --> 09:20.160 It's at 50. 09:20.190 --> 09:21.630 We're subtracting 25. 09:21.630 --> 09:23.150 It should go down to halfway. 09:23.160 --> 09:26.850 So let's pick it up and it goes down to halfway. 09:27.120 --> 09:29.790 Health still goes up to 75%. 09:29.820 --> 09:37.050 We can show debug ability system and see that man is 25, max, man is 50. 09:37.140 --> 09:39.900 Things are working so excellent. 09:39.900 --> 09:43.380 And if you got through this whole challenge on your own, congratulations. 09:43.380 --> 09:45.940 And if you didn't, don't be hard on yourself. 09:45.940 --> 09:47.440 This was a bigger challenge. 09:47.440 --> 09:52.960 And these challenges, some of them are easier and some of them are harder. 09:52.990 --> 09:56.710 Do not get discouraged when you hit one of the harder ones. 09:56.710 --> 09:58.900 If you can't figure it out on your own. 09:58.900 --> 10:05.470 That's the whole reason why I'm going through the solution with you after you try it yourself. 10:05.470 --> 10:09.700 So do try them yourself, but don't get discouraged if you can't figure them out. 10:09.700 --> 10:11.650 It's okay if you can't. 10:11.920 --> 10:12.730 All right. 10:12.730 --> 10:14.220 So great job. 10:14.230 --> 10:17.590 We now know how to respond to attribute changes. 10:17.590 --> 10:20.050 We know how to show those changes in the HUD. 10:20.080 --> 10:27.580 We're now ready to move on to the more interesting stuff in the gameplay ability system, such as gameplay 10:27.580 --> 10:31.510 effects, and we'll learn how those work as well. 10:31.600 --> 10:36.670 And by the way, if you were curious, you could change the number of players to two and change the 10:36.670 --> 10:42.970 net mode to say, listen, server and press play just to make sure that things work in multiplayer. 10:42.970 --> 10:50.230 So you can have two characters here running around and each of them, they have their own attributes 10:50.230 --> 10:53.350 changing in response to things happening in the game. 10:53.350 --> 10:58.930 So we'll test more in multiplayer as we continue developing the course. 10:58.930 --> 11:02.530 So great job and I'll see you in the next video.