All language subtitles for 014 Creating a Global Key_en

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Would you like to inspect the original subtitles? These are the user uploaded subtitles that are being translated: 1 00:00:00,840 --> 00:00:06,060 In the last section, we spoke about how we need to create a global key and somehow reference it or 2 00:00:06,060 --> 00:00:10,980 get it to reference our form state that is created and each time we create a form widget, again, I 3 00:00:10,980 --> 00:00:14,760 know this stuff is kind of heavy duty, kind of complicated, but as soon as we start writing some code, 4 00:00:14,760 --> 00:00:16,890 I think you'll start to get an idea of what's going on. 5 00:00:17,070 --> 00:00:18,200 So let's write some code. 6 00:00:18,960 --> 00:00:24,180 I'm going to begin by looking back over to my code editor and I'm going to find my login screen state 7 00:00:24,180 --> 00:00:24,770 class. 8 00:00:25,500 --> 00:00:31,380 So inside, if you're going to create a new instance variable that's going to store that global key. 9 00:00:32,070 --> 00:00:36,660 So I'm going to make a final variable which remembers just means I cannot reassign this variable. 10 00:00:38,170 --> 00:00:44,260 I'm going to call it form key because it's referencing the form into it, I'm going to assign global 11 00:00:44,260 --> 00:00:49,500 key and then this thing uses that same generic syntax that we use for state up here. 12 00:00:49,930 --> 00:00:57,280 Remember, these generic open closing little brackets are a way to kind of create a constructor or a 13 00:00:57,280 --> 00:01:00,170 class that accepts a type almost like a function. 14 00:01:00,670 --> 00:01:05,650 So we put a type inside of here and that customizes how all the functions inside of it behave, or at 15 00:01:05,650 --> 00:01:07,630 least what different types they expect. 16 00:01:08,540 --> 00:01:15,080 So to the global key, we do not want to reference the form class, we want to reference a class called 17 00:01:15,080 --> 00:01:16,260 Form State. 18 00:01:16,850 --> 00:01:22,010 So for the type here, I'm going to put in form state like so, and then I'm going to put myself in 19 00:01:22,010 --> 00:01:26,300 parentheses to indicate that I want to create an instance of this global key thing. 20 00:01:27,400 --> 00:01:33,940 OK, so this right here is just about the only place we're going to see this form state thing come into 21 00:01:33,940 --> 00:01:34,310 play. 22 00:01:34,420 --> 00:01:39,250 That's why I had to tell you about the existence of this form state, because at some point we had to, 23 00:01:39,250 --> 00:01:41,020 like, write out Farm State right here. 24 00:01:41,260 --> 00:01:45,640 If we just wrote form state, you probably would have been like, Stephen, why are we writing for state 25 00:01:45,640 --> 00:01:46,470 and not just farm? 26 00:01:47,440 --> 00:01:48,670 OK, so this creates the key. 27 00:01:48,970 --> 00:01:54,370 Now, step two is to take this key and associated with the form widget that we are creating. 28 00:01:55,060 --> 00:02:01,810 So on my form widget as an additional named property, I'm going to pass in key and key is going to 29 00:02:01,810 --> 00:02:05,060 be the form key instance variable that we just created. 30 00:02:05,080 --> 00:02:06,940 So I'm going to say form key like so. 31 00:02:07,810 --> 00:02:08,789 And that's pretty much it. 3219

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