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

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CHAPTER19Altering Existing Behaviorwith Function HookingMost addons are designed as self-contained additions to the default userinterface. These addons make use of the provided API and the frames andfunctionality in the default user interface. Sometimes, however, it makes senseto alter the existing behavior of the UI. One way that can be accomplishedis known as function hooking. This chapter introduces the concept of functionhooking, including specific rules to follow and pitfalls to avoid.What Is Function Hooking?‘‘Hooking a function’’ is mostly just a fancy way of saying ‘‘changing thebehavior of a function.’’ Like any other Lua variable, you can overwrite afunction value with a new one of your creation. Then, any time code tries tocall the function, it will use yours instead. More specifically, though, functionhooking means that the original function still runs, at least when a functionhook behaves properly.Function hooks are used to alter the behavior of an existing function in oneof the following ways:Altering the arguments to or the return values from the original function.Preventing the original function from running.Taking extra action each time the function is called.359
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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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APPENDIXABest PracticesThroughout t
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Appendix A ■ Best Practices 1307O
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Appendix A ■ Best Practices 1309}
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Appendix A ■ Best Practices 1311a
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Appendix A ■ Best Practices 1313I
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Appendix A ■ Best Practices 1315O
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Appendix A ■ Best Practices 1319f
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Appendix A ■ Best Practices 1321U
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Appendix A ■ Best Practices 1323T
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Appendix A ■ Best Practices 1325f
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1330 Part V ■ AppendixesI use a f
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1332 Part V ■ AppendixesThe first
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1334 Part V ■ AppendixesVersionin
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1336 Part V ■ AppendixesPortfolio
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APPENDIXCTracking History Using Ver
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Appendix C ■ Tracking History Usi
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APPENDIXDAddon Author ResourcesThro
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Appendix D ■ Addon Author Resourc
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1358 Index ■ A-AAddMute, 559addon
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1360 Index ■ B-BBagBuddy_Update()
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1362 Index ■ C-CCancelBarberShop,
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1364 Index ■ C-CClearSendMail, 61
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1366 Index ■ C-DCreateFrame, 172,
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1368 Index ■ E-Fevents reference,
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1370 Index ■ F-Gframes, creatinga
Page 1414 and 1415:
1372 Index ■ G-GGetColorWheelThum
Page 1416 and 1417:
1374 Index ■ G-GGetLookingForGrou
Page 1418 and 1419:
1376 Index ■ G-GGetQuestLogLeader
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1378 Index ■ G-GGetVoiceSessionIn
Page 1422 and 1423:
1380 Index ■ I-IINSTAKILL, combat
Page 1424 and 1425:
1382 Index ■ K-LKBSetup_GetSubCat
Page 1426 and 1427:
1384 Index ■ M-OMoveViewOutStart,
Page 1428 and 1429:
1386 Index ■ P-PPPageDown(), Scro
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1388 Index ■ R-SrepositoryGit and
Page 1432 and 1433:
1390 Index ■ S-SSetChatWindowName
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1392 Index ■ S-SSetSelectedAuctio
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1394 Index ■ S-TStartMovie(), Mov
Page 1438 and 1439:
1396 Index ■ T-Utimer frames, 368
Page 1440 and 1441:
1398 Index ■ U-Vupdate function (
Page 1442 and 1443:
1400 Index ■ W-Zwipe, Lua API, 10
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Wiley-World.of.Warcraft.Programming.A.Guide.and.Reference.for.Creating.WoW.Addons

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