0 1 00:00:04,930 --> 00:00:05,763 Hello again. 1 2 00:00:05,763 --> 00:00:07,791 In this lesson, what we are going to do, 2 3 00:00:07,791 --> 00:00:10,070 let me run our application first. 3 4 00:00:10,070 --> 00:00:14,830 Here, we are going to create a function for exit menu item. 4 5 00:00:14,830 --> 00:00:19,120 And this one will little bit more complicated, okay? 5 6 00:00:19,120 --> 00:00:20,360 And here what I need to do, 6 7 00:00:20,360 --> 00:00:25,360 firstly, let's go to create our comment property, okay? 7 8 00:00:25,360 --> 00:00:26,810 It is here, right? 8 9 00:00:26,810 --> 00:00:31,500 And I will say here, comma after enter, 9 10 00:00:31,500 --> 00:00:36,500 comment equals self dot parent dot exitfunc, okay? 10 11 00:00:40,100 --> 00:00:41,560 Something like that. 11 12 00:00:41,560 --> 00:00:42,800 And here what I need to do, 12 13 00:00:42,800 --> 00:00:45,170 I need to create this function, right? 13 14 00:00:45,170 --> 00:00:49,900 And I will go to do find my last function is here. 14 15 00:00:49,900 --> 00:00:51,760 Save as file, right? 15 16 00:00:51,760 --> 00:00:56,760 And here, I will say, def exitfunc, and like before, 16 17 00:00:58,610 --> 00:01:01,270 asterisk arg, arguments, right? 17 18 00:01:01,270 --> 00:01:04,460 And here, what I want to do, 18 19 00:01:04,460 --> 00:01:06,520 here before creating our function, 19 20 00:01:06,520 --> 00:01:09,370 I want to show you something, okay here. 20 21 00:01:09,370 --> 00:01:12,305 I will open again here, Notepad, okay? 21 22 00:01:12,305 --> 00:01:13,520 NotePad. 22 23 00:01:13,520 --> 00:01:14,420 And this here. 23 24 00:01:14,420 --> 00:01:18,050 So we have different options here, okay? 24 25 00:01:18,050 --> 00:01:19,850 Three different options, actually. 25 26 00:01:19,850 --> 00:01:21,460 The first on is, for example, here, 26 27 00:01:21,460 --> 00:01:23,110 this is a new file, right? 27 28 00:01:23,110 --> 00:01:24,870 New file, okay. 28 29 00:01:24,870 --> 00:01:29,870 So if I say file exit, you see I close my application. 29 30 00:01:30,610 --> 00:01:33,743 And for example, if I say notepad now, 30 31 00:01:35,700 --> 00:01:38,340 here because, in previous example, 31 32 00:01:38,340 --> 00:01:41,867 I didn't change content of my file, okay, this important. 32 33 00:01:41,867 --> 00:01:45,600 But if I change my content of file, but now what I need to do, 33 34 00:01:45,600 --> 00:01:47,620 say file exit. 34 35 00:01:47,620 --> 00:01:50,370 Now you see, this guy, this file, 35 36 00:01:50,370 --> 00:01:52,160 it doesn't have a URL, okay? 36 37 00:01:52,160 --> 00:01:56,310 And it says, "Do you want to save changes to Untitled?" 37 38 00:01:56,310 --> 00:01:57,280 For this guy. 38 39 00:01:57,280 --> 00:01:59,320 If I say yes, save, 39 40 00:01:59,320 --> 00:02:02,829 so I will open a new dialogue window here, 40 41 00:02:02,829 --> 00:02:05,010 and after, I will name my file. 41 42 00:02:05,010 --> 00:02:05,980 Okay? 42 43 00:02:05,980 --> 00:02:09,310 And after that, this is second option by the way. 43 44 00:02:09,310 --> 00:02:10,370 If I, for example, 44 45 00:02:10,370 --> 00:02:14,800 if I open an existing file from my computer, that one. 45 46 00:02:14,800 --> 00:02:17,290 Okay, and if I change content of this guy, 46 47 00:02:17,290 --> 00:02:18,853 and if I say exit, 47 48 00:02:19,730 --> 00:02:22,680 and do you want to save changes to this guy, 48 49 00:02:22,680 --> 00:02:26,590 right, this file, if I say yes, save, 49 50 00:02:26,590 --> 00:02:27,423 I will save it, 50 51 00:02:27,423 --> 00:02:30,470 but I will not see a dialogue button here, okay? 51 52 00:02:30,470 --> 00:02:33,560 For example, you see, I save it and quit my application. 52 53 00:02:33,560 --> 00:02:35,170 If I say don't save, 53 54 00:02:35,170 --> 00:02:37,540 I will quit my application and without saving. 54 55 00:02:37,540 --> 00:02:41,390 If I say cancel, that means I will not do anything, okay? 55 56 00:02:41,390 --> 00:02:44,419 So, here, what I need to do, 56 57 00:02:44,419 --> 00:02:49,419 also I need to know that my content of file, 57 58 00:02:49,450 --> 00:02:54,450 change or, I change my content or I didn't change, okay? 58 59 00:02:55,710 --> 00:02:57,220 This is very important. 59 60 00:02:57,220 --> 00:02:58,800 And here, what I need to do, 60 61 00:02:58,800 --> 00:03:02,540 I need to create here global variable first, URL. 61 62 00:03:03,520 --> 00:03:05,280 And also, remember, 62 63 00:03:05,280 --> 00:03:08,720 we already created text changed global variable. 63 64 00:03:08,720 --> 00:03:09,960 It's here, right? 64 65 00:03:09,960 --> 00:03:12,080 Text changed false. 65 66 00:03:12,080 --> 00:03:14,510 For default, by default, it is false. 66 67 00:03:14,510 --> 00:03:19,510 So here, and I need to use here also text changed. 67 68 00:03:20,600 --> 00:03:21,790 Okay, this is important. 68 69 00:03:21,790 --> 00:03:24,020 If changed, we are doing something else. 69 70 00:03:24,020 --> 00:03:27,192 If we are not changed, we'll do something else. 70 71 00:03:27,192 --> 00:03:28,400 Okay, this is important. 71 72 00:03:28,400 --> 00:03:33,400 So, here, between try and except, I would say except. 72 73 00:03:33,630 --> 00:03:36,930 For except we can say return, okay, simply. 73 74 00:03:36,930 --> 00:03:39,830 But for try, we need to do something more. 74 75 00:03:39,830 --> 00:03:41,330 And here, first I will say, 75 76 00:03:41,330 --> 00:03:46,330 if text changed equals equals true, okay, 76 77 00:03:46,590 --> 00:03:49,130 that means I changed my content. 77 78 00:03:49,130 --> 00:03:52,550 So here, I need to use message box, okay? 78 79 00:03:52,550 --> 00:03:56,333 And I will say mbox equals message box. 79 80 00:03:59,230 --> 00:04:02,240 So what I need to do, I need to import message box, okay, 80 81 00:04:02,240 --> 00:04:05,560 from tkinter import here. 81 82 00:04:05,560 --> 00:04:10,560 Message box, and now I can use message box here. 82 83 00:04:11,240 --> 00:04:13,260 Let's find it, it's here. 83 84 00:04:13,260 --> 00:04:14,750 So I will say, 84 85 00:04:14,750 --> 00:04:19,750 message box dot yes no cancel, okay, that one. 85 86 00:04:20,760 --> 00:04:23,330 And after here, the first parameter 86 87 00:04:23,330 --> 00:04:26,670 will be my title, Warning, okay. 87 88 00:04:26,670 --> 00:04:31,504 Second ones is my message, and I will say, 88 89 00:04:31,504 --> 00:04:36,504 do you want to save the file, okay? 89 90 00:04:38,410 --> 00:04:39,980 And this is enough. 90 91 00:04:39,980 --> 00:04:43,460 After that what I need to do, here I need to check, 91 92 00:04:43,460 --> 00:04:48,380 because here for yes no cancel and message box, 92 93 00:04:48,380 --> 00:04:50,220 we have three options, okay? 93 94 00:04:50,220 --> 00:04:55,143 So I need to tell you something for if user says yes, 94 95 00:04:56,690 --> 00:05:00,370 that means this guy will return me true. 95 96 00:05:00,370 --> 00:05:03,780 If no, for the the no button, it will return me false, 96 97 00:05:03,780 --> 00:05:06,110 or cancel it will return me none. 97 98 00:05:06,110 --> 00:05:06,943 Okay? 98 99 00:05:06,943 --> 00:05:08,470 So here, what I need to do, 99 100 00:05:08,470 --> 00:05:13,450 I will say if mbox is true, 100 101 00:05:14,830 --> 00:05:19,140 okay that means you user clicked yes button, okay? 101 102 00:05:19,140 --> 00:05:20,305 Do you want to save file? 102 103 00:05:20,305 --> 00:05:21,319 Yes. 103 104 00:05:21,319 --> 00:05:23,220 So, now what I need to do, 104 105 00:05:23,220 --> 00:05:25,890 I need to check something else again, okay? 105 106 00:05:25,890 --> 00:05:29,010 Now, I need to, know if this guy 106 107 00:05:29,010 --> 00:05:31,850 is an existing file or a new file. 107 108 00:05:31,850 --> 00:05:36,850 So, like we did for save, right, over here, save. 108 109 00:05:38,510 --> 00:05:39,343 Save file. 109 110 00:05:39,343 --> 00:05:40,760 So we will do same thing, okay? 110 111 00:05:40,760 --> 00:05:45,760 Here, I will say, if URL not equals empty, okay. 111 112 00:05:50,470 --> 00:05:51,350 And here I will say 112 113 00:05:51,350 --> 00:05:56,350 content equals self dot text editor dot get 113 114 00:05:59,450 --> 00:06:04,450 from first until end, right? 114 115 00:06:04,590 --> 00:06:06,660 And here, what I need to do, like before, 115 116 00:06:06,660 --> 00:06:11,650 I say with open and I will use here URL 116 117 00:06:13,320 --> 00:06:17,516 and second one will be write mode , right? 117 118 00:06:17,516 --> 00:06:22,516 And encoding equals "utf-8", okay? 118 119 00:06:25,720 --> 00:06:28,713 And here I will say as file. 119 120 00:06:29,970 --> 00:06:34,970 And here I will say file dot write and my content, okay? 120 121 00:06:39,000 --> 00:06:40,520 And after that, what I need to do, 121 122 00:06:40,520 --> 00:06:42,320 now I need to destroy my window, 122 123 00:06:42,320 --> 00:06:45,290 because I already saved my file, okay? 123 124 00:06:45,290 --> 00:06:49,480 And I will destroy my file, sorry I will destroy my window. 124 125 00:06:49,480 --> 00:06:54,480 Self dot parent dot destroy, okay? 125 126 00:06:59,010 --> 00:07:03,113 Now, even we can't see that here, for example, notepad, here. 126 127 00:07:05,540 --> 00:07:10,270 Let's open an existing file, because it has a URL, right? 127 128 00:07:10,270 --> 00:07:14,730 And now open, that one, right? 128 129 00:07:14,730 --> 00:07:16,663 Now, I will change something. 129 130 00:07:17,610 --> 00:07:19,020 File exit. 130 131 00:07:19,020 --> 00:07:20,713 Do you want to save your file? 131 132 00:07:20,713 --> 00:07:22,660 This said here what we said. 132 133 00:07:22,660 --> 00:07:24,580 We said yes, right? 133 134 00:07:24,580 --> 00:07:28,403 Mbox is true, save, you see? 134 135 00:07:29,310 --> 00:07:31,670 We destroyed our window, okay? 135 136 00:07:31,670 --> 00:07:32,663 And for else, 136 137 00:07:34,260 --> 00:07:39,260 now else means here, my URL is not, 137 138 00:07:40,630 --> 00:07:44,070 sorry my, not exist, okay? 138 139 00:07:44,070 --> 00:07:46,270 So let me set this to new file. 139 140 00:07:46,270 --> 00:07:48,680 And here I will create another content variable. 140 141 00:07:48,680 --> 00:07:51,713 Content2 equals str, okay? 141 142 00:07:52,680 --> 00:07:55,590 And I will say self dot text editor get 142 143 00:07:59,700 --> 00:08:02,430 from first until end, right? 143 144 00:08:02,430 --> 00:08:05,860 And now what I need to do, I need to use here, 144 145 00:08:05,860 --> 00:08:07,230 dialog window, okay? 145 146 00:08:07,230 --> 00:08:09,710 So, I'll say URL equals, 146 147 00:08:09,710 --> 00:08:12,393 because this guy doesn't have a URL, okay? 147 148 00:08:13,289 --> 00:08:17,120 URL is not empty, that one, that means URL is empty. 148 149 00:08:17,120 --> 00:08:18,733 So file dialogue. 149 150 00:08:19,910 --> 00:08:23,563 Even for this guy, let's copy this one, okay? 150 151 00:08:24,840 --> 00:08:26,453 And paste it here. 151 152 00:08:30,410 --> 00:08:34,416 And after that, what I need to do, like before, I will say 152 153 00:08:34,416 --> 00:08:39,416 URL dot write, and I will say here content two. 153 154 00:08:40,920 --> 00:08:42,430 Now I can close my URL. 154 155 00:08:42,430 --> 00:08:45,780 URL dot close, okay? 155 156 00:08:45,780 --> 00:08:49,093 And now this is second option. 156 157 00:08:50,940 --> 00:08:52,830 Sorry, this is first option, right? 157 158 00:08:52,830 --> 00:08:57,830 This is for if, if mbox, I will come here 158 159 00:08:57,890 --> 00:09:00,490 if mbox is false, is false 159 160 00:09:06,717 --> 00:09:10,980 that means user said "no," okay? 160 161 00:09:10,980 --> 00:09:13,620 What I will do here, I will say, 161 162 00:09:13,620 --> 00:09:18,620 self dot parent dot destroy, okay? 162 163 00:09:18,630 --> 00:09:23,140 Because this asks the user, do you want to save file? 163 164 00:09:23,140 --> 00:09:25,400 He said or she said, "No." 164 165 00:09:25,400 --> 00:09:27,360 So we will destroy our window, okay? 165 166 00:09:27,360 --> 00:09:31,183 And for the last one, last one means here, 166 167 00:09:35,480 --> 00:09:39,310 sorry, here, mbox is true, yes is that one. 167 168 00:09:39,310 --> 00:09:44,310 And for mbox is false, we say no, and for last option, 168 169 00:09:45,270 --> 00:09:48,140 here what we we know here, if text changed, right? 169 170 00:09:48,140 --> 00:09:50,830 This is is for true, for if text, 170 171 00:09:50,830 --> 00:09:53,810 if we didn't change our text content, 171 172 00:09:53,810 --> 00:09:55,640 that means here I will say 172 173 00:09:55,640 --> 00:10:00,553 else self dot parent dot destroy again, okay? 173 174 00:10:02,160 --> 00:10:03,440 By the way, for cancel, 174 175 00:10:03,440 --> 00:10:06,320 you might wonder why we don't use for cancel, 175 176 00:10:06,320 --> 00:10:11,320 because, let me, here for example, notepad, okay? 176 177 00:10:11,370 --> 00:10:13,440 And I will change content. 177 178 00:10:13,440 --> 00:10:15,450 I will say file exit. 178 179 00:10:15,450 --> 00:10:18,360 If I say cancel, you see nothing happens, 179 180 00:10:18,360 --> 00:10:21,083 so we don't need to do something for cancel. 180 181 00:10:21,083 --> 00:10:22,810 Even we can open a new file. 181 182 00:10:22,810 --> 00:10:25,410 Let's delete this one. 182 183 00:10:25,410 --> 00:10:26,423 And open. 183 184 00:10:27,640 --> 00:10:31,330 And here, I will change the content, okay? 184 185 00:10:31,330 --> 00:10:34,170 And say exit, cancel. 185 186 00:10:34,170 --> 00:10:35,320 You see nothing happens, 186 187 00:10:35,320 --> 00:10:39,390 so we don't need to do something for cancel button, okay? 187 188 00:10:39,390 --> 00:10:40,940 And don't save. 188 189 00:10:40,940 --> 00:10:45,200 So, and for if text changed true, we are going to do that. 189 190 00:10:45,200 --> 00:10:48,000 If we didn't change text, that means here, 190 191 00:10:48,000 --> 00:10:52,283 by the way, let me show you, to, here notepad again. 191 192 00:10:54,210 --> 00:10:58,266 And here, this guy doesn't have URL. 192 193 00:10:58,266 --> 00:11:01,120 If I say exit, you see nothing happens. 193 194 00:11:01,120 --> 00:11:02,437 I destroy my window. 194 195 00:11:02,437 --> 00:11:06,520 Even if I open an existing file from my computer, 195 196 00:11:08,264 --> 00:11:10,847 file open, let's open that one. 196 197 00:11:12,089 --> 00:11:16,706 Now, I don't change my content and say file exit. 197 198 00:11:16,706 --> 00:11:18,295 You see, I destroy my window. 198 199 00:11:18,295 --> 00:11:22,091 And this else will be executed, okay? 199 200 00:11:22,091 --> 00:11:25,279 And now if I run our application, 200 201 00:11:25,279 --> 00:11:27,179 we will see what happens. 201 202 00:11:27,179 --> 00:11:30,539 Now here, for example, that one, 202 203 00:11:30,539 --> 00:11:32,364 already the text changed, right? 203 204 00:11:32,364 --> 00:11:35,511 And if I say exit, do you want to save the file? 204 205 00:11:35,511 --> 00:11:36,572 I will say cancel. 205 206 00:11:36,572 --> 00:11:38,273 Nothing happens. 206 207 00:11:38,273 --> 00:11:42,076 If I say exit again, no, we destroy our window. 207 208 00:11:42,076 --> 00:11:43,659 Let's run it again. 208 209 00:11:44,572 --> 00:11:48,274 And here I will say, this a new file, by the way. 209 210 00:11:48,274 --> 00:11:49,278 Exit. 210 211 00:11:49,278 --> 00:11:50,656 Do you want to save the file? 211 212 00:11:50,656 --> 00:11:51,492 Yes. 212 213 00:11:51,492 --> 00:11:56,082 So you see, this is this dialog window we opened, 213 214 00:11:56,082 --> 00:11:57,760 because this guy doesn't have URL. 214 215 00:11:57,760 --> 00:12:00,090 So cancel, okay? 215 216 00:12:00,090 --> 00:12:03,263 And now, here I will delete this one, 216 217 00:12:04,360 --> 00:12:06,810 and say open an existing one. 217 218 00:12:06,810 --> 00:12:07,833 This one, okay. 218 219 00:12:09,030 --> 00:12:13,430 And here, if I click exit, do you want to save the file? 219 220 00:12:13,430 --> 00:12:14,263 Yes. 220 221 00:12:14,263 --> 00:12:16,050 And after that, I destroy my window. 221 222 00:12:16,050 --> 00:12:19,530 This is how we can create exit function for our application. 222 223 00:12:19,530 --> 00:12:20,620 For now, that's all. 223 224 00:12:20,620 --> 00:12:21,620 See you in the next.