Wiley-World.of.Warcraft.Programming.A.Guide.and.Reference.for.Creating.WoW.Addons

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254 Part II ■ Programming in World of WarcrafttoFinally, add an attribute definition between the tag and the tag for BagBuddyItemTemplate:Now when you open BagBuddy, you should be able to use items (such asfood, potions, bandages, and quest items) by right-clicking on them.Finding the Right Event Using /eventtraceOne of the most challenging aspects of writing an addon for World of Warcraftis finding the right events to ensure your addon functions properly. Someapplications are very simple, such as using UNIT_HEALTH to monitor the healthof an in-game unit. Others, such as those dealing with the player’s containersand inventory, can be a bit tricky to deal with at times.The Blizzard_DebugTools addon included with the default user interfaceprovides the slash command /eventtrace that makes tracking down eventinformation a bit easier. The command has a few different forms:/eventtrace start—Start capturing events, whether or not the windowis shown./eventtrace stop—Stop capturing events./eventtrace—Show the window if it is currently hidden, and startcapturing events if the window hasn’t been shown before. Otherwise,hide the window./eventtrace —If the addon is not currently capturing events,capture exactly events and then stop capturing events.The results are displayed for you in an easy-to-navigate window, shown inFigure 13-2.You can scroll through the resulting events to view their arguments andthe time at which they were called. In addition, the event trace will show youhow much time elapsed between two events (if any) and how many times thescreen was updated.When you need to find out what events fires under a certain situation (suchas when you cast a spell on an enemy), you can start an event trace andreplicate the situation. Then you can stop the event trace and explore theevents that fired to get the information you need.
Chapter 13 ■ Responding to Game Events 255Figure 13-2: /eventtrace window showing event informationSummaryThis chapter explored how the game client notifies addons of changes to thestate of the game. You added event handling to BagBuddy to track changes tothe player’s inventory. The last few chapters have introduced you to all of thevital parts of creating an addon. The next chapter pulls everything together tocreate another fully-functional addon called CombatTracker.The CodeBagBuddy.luafunction BagBuddy OnLoad(self)UIPanelWindows[“BagBuddy“] = {area = “left“,pushable = 1,whileDead = 1,}SetPortraitToTexture(self.portrait, i“Interface\\Icons\\INV Misc EngGizmos 30“)-- Create the item slots
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A Guide and Reference for Creating
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World of Warcraft® Programming: A
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CreditsAcquisitions EditorScott Mey
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xAcknowledgmentsI’d first like to
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xiiContents at a GlanceChapter 13 R
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xivContentsUsing History to Make Ch
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xviContentsExtending Tables with Me
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xviiiContents## Title: 127## Notes:
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xxContentsInvestigating UIPanelTemp
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xxiiContentsAdding an OnEvent Handl
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xxivContentsPreparing for the Token
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xxviContentsWriting an OnUpdate Fun
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xxviii ContentsSummary 496The Code
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xxxContentsChapter 28 API Categorie
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xxxii ContentsTrade Skill Functions
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xxxiv ContentsRequesting Data Befor
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IntroductionSince World of Warcraft
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Introduction xxxixPart II discusses
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CHAPTER1Programming for Worldof War
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Chapter 1 ■ Programming for World
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CHAPTER2Exploring Lua BasicsLua is
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Chapter 2 ■ Exploring Lua Basics
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CHAPTER4Working with TablesKeeping
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Chapter 7 ■ Learning XML 121Summa
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CHAPTER8Anatomy of an AddonAs discu
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Chapter 8 ■ Anatomy of an Addon 1
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CHAPTER9Working with Frames, Widget
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CHAPTER16Binding Keys and Clicksto
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338 Part III ■ Advanced Addon Tec
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CHAPTER21Responding to the Combat L
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CHAPTER22Creating Scroll FramesWhen
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CHAPTER24Scanning and ConstructingT
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PartIVReferenceIn This PartChapter
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542 Part IV ■ ReferenceAPI Meta-T
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546 Part IV ■ Referencezero inten
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558 Part IV ■ ReferenceConfirmati
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616 Part IV ■ ReferenceFires the
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620 Part IV ■ ReferenceCOMBATLOG_
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622 Part IV ■ ReferenceUsable bet
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624 Part IV ■ ReferenceCreateMacr
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676 Part IV ■ ReferenceReturns:ch
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680 Part IV ■ ReferenceCR_CRIT_TA
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682 Part IV ■ Referenceenable—1
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750 Part IV ■ ReferenceGetNumComp
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808 Part IV ■ ReferenceTotem func
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1086 Part IV ■ ReferenceConfirmBi
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1090 Part IV ■ ReferenceGetGossip
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1092 Part IV ■ ReferenceGetQuestL
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1094 Part IV ■ ReferenceRaid Func
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1096 Part IV ■ Referenceissecure
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1100 Part IV ■ ReferenceIsAttackS
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CHAPTER29Widget ReferenceTo respond
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1278 Part IV ■ ReferenceADDON_ACT
Page 1322 and 1323:
1280 Part IV ■ ReferenceCALENDAR_
Page 1324 and 1325:
1282 Part IV ■ ReferenceCHAT_MSG_
Page 1326 and 1327:
1284 Part IV ■ ReferenceCORPSE_OU
Page 1328 and 1329:
1286 Part IV ■ ReferenceGUILDBANK
Page 1330 and 1331:
1288 Part IV ■ ReferenceKNOWLEDGE
Page 1332 and 1333:
1290 Part IV ■ ReferenceOPEN_TABA
Page 1334 and 1335:
1292 Part IV ■ ReferencePLAYER_EN
Page 1336 and 1337:
1294 Part IV ■ ReferenceQUEST_LOG
Page 1338 and 1339:
1296 Part IV ■ ReferenceTRADE_POT
Page 1340 and 1341:
1298 Part IV ■ ReferenceUNIT_PET_
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1300 Part IV ■ ReferenceUPDATE_MA
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PartVAppendixesIn This PartAppendix
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1306 Part V ■ AppendixesUse Meani
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1308 Part V ■ Appendixeshard codi
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1310 Part V ■ AppendixesOrganizat
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1312 Part V ■ Appendixesespeciall
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1314 Part V ■ Appendixesitself to
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1316 Part V ■ AppendixesTAIL CALL
Page 1360 and 1361:
1318 Part V ■ AppendixesEach time
Page 1362 and 1363:
1320 Part V ■ AppendixesEven if y
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1322 Part V ■ AppendixesEach even
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1324 Part V ■ Appendixesthe basic
Page 1368 and 1369:
1326 Part V ■ AppendixesEntering
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APPENDIXBUtilizing Addon LibrariesW
Page 1373 and 1374:
Appendix B ■ Utilizing Addon Libr
Page 1375 and 1376:
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Page 1379:
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1340 Part V ■ AppendixesOne major
Page 1384 and 1385:
1342 Part V ■ Appendixessvn updat
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1344 Part V ■ AppendixesGit and M
Page 1388 and 1389:
1346 Part V ■ AppendixesOnce that
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1348 Part V ■ Appendixesremote: a
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1350 Part V ■ Appendixeshave alre
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1352 Part V ■ Appendixesthe other
Page 1396 and 1397:
1354 Part V ■ Appendixesand open
Page 1399 and 1400:
IndexAAbandonQuest, 556AbandonSkill
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Index ■ A-B 1359hyperlink, 549-55
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Index ■ B-C 1361BuyPetition, 564B
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Index ■ C-C 1363Lua library funct
Page 1407 and 1408:
Index ■ C-C 1365storing damage an
Page 1409 and 1410:
Index ■ D-E 1367dropdown frames,
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Index ■ F-F 1369TabButtonTemplate
Page 1413 and 1414:
Index ■ G-G 1371GetAchievementNum
Page 1415 and 1416:
Index ■ G-G 1373GetGameTime, 699G
Page 1417 and 1418:
Index ■ G-G 1375GetNumLetters(),
Page 1419 and 1420:
Index ■ G-G 1377GetStatusBarColor
Page 1421 and 1422:
Index ■ G-I 1379GuildInvite, 832G
Page 1423 and 1424:
Index ■ I-K 1381IsPlaying(), Anim
Page 1425 and 1426:
Index ■ L-M 1383Lua interpreterdo
Page 1427 and 1428:
Index ■ O-O 1385OnClick widget sc
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Index ■ P-R 1387PlaySoundFile, 89
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Index ■ S-S 1389how addon code ca
Page 1433 and 1434:
Index ■ S-S 1391SetInventoryItem(
Page 1435 and 1436:
Index ■ S-S 1393overview of, 337S
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Index ■ T-T 1395table.insert, 58-
Page 1439 and 1440:
Index ■ U-U 1397UnitArmor, 962Uni
Page 1441 and 1442:
Index ■ W-W 1399WWebLua, 15well-f
Page 1443:
Your secret weapon againstthe Lich
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Wiley-World.of.Warcraft.Programming.A.Guide.and.Reference.for.Creating.WoW.Addons

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