C++ GUI programming with Qt 4 PDF
Preview C++ GUI programming with Qt 4
C++ GUI Programming with Qt 4 Second Edition This page intentionally left blank C++ GUI Programming with Qt 4 Second Edition JasminBlanchette MarkSummerfield InassociationwithTrolltechPress UpperSaddleRiver,NJ·Boston·Indianapolis·SanFrancisco NewYork·Toronto·Montreal·London·Munich·Paris·Madrid Capetown·Sydney·Tokyo·Singapore·MexicoCity Manyof thedesignationsusedbymanufacturersandsellerstodistinguishtheirproductsareclaimedas trademarks. Wherethosedesignationsappearinthisbook,andthepublisherwasawareof atrademark claim,thedesignationshavebeenprintedwithinitialcapitallettersorinallcapitals. Theauthorsandpublisherhavetakencareinthepreparationofthisbook,butmakenoexpressedorimplied warrantyof anykindandassumenoresponsibilityforerrorsoromissions. Noliabilityisassumedfor incidentalorconsequentialdamagesinconnectionwithorarisingout of theuseof theinformationor programscontainedherein. Thepublisheroffersexcellentdiscountsonthisbookwhenorderedinquantityforbulkpurchasesorspecial sales,whichmayincludeelectronicversionsand/orcustomcoversandcontentparticulartoyourbusiness, traininggoals,marketingfocus,andbrandinginterests. Formoreinformation,pleasecontact: U.S.CorporateandGovernmentSales (800)382-3419 [email protected] ForsalesoutsidetheUnitedStates,pleasecontact: InternationalSales [email protected] VisitusontheWeb:www.prenhallprofessional.com ThisBookIsSafariEnabled TheSafari®Enabledicononthecoverofyourfavoritetechnologybookmeansthebook isavailablethroughSafariBookshelf. Whenyoubuythisbook,yougetfreeaccesstothe onlineeditionfor45days. SafariBookshelfisanelectronicreferencelibrarythatletsyoueasilysearchthousandsoftechnicalbooks, find code samples, download chapters, and access technical information whenever and wherever you needit. Togain45-daySafariEnabledaccesstothisbook: • Gotohttp://www.prenhallprofessional.com/safarienabled • Completethebriefregistrationform • EnterthecouponcodeS1F3-5NDG-9Z64-LNGX-K8F2 IfyouhavedifficultyregisteringonSafariBookshelforaccessingtheonlineedition,pleasee-mail [email protected]. Libraryof CongressCataloging-in-PublicationData Blanchette,Jasmin. C++GUIprogrammingwithQt4/JasminBlanchette,MarkSummerfield.–2nded. p. cm. Includesindex. ISBN-13:978-0-13-235416-5 (hardcover:alk. paper) 1.Qt(Electronicresource) 2.Graphicaluserinterfaces(Computersystems) 3.C++(Computerprogram language) I.Summerfield,Mark. II.Title. QA76.9.U83B5322008 005.13’3—dc22 2008000243 Copyright©2008TrolltechASA Allrightsreserved. PrintedintheUnitedStatesof America. Thispublicationmayonlybedistributed subjecttothetermsandconditionssetforthintheOpenPublicationLicense,v1.0orlater(thelatestversion isavailableathttp://www.opencontent.org/openpub/). Trolltech®,Qt®,Qtopia®,andtheTrolltechandQtopialogosareregisteredtrademarksofTrolltechASA. ISBN-13:978-0-13-235416-5 ISBN-10: 0-13-235416-0 TextprintedintheUnitedStatesonrecycledpaperatCourierinWestford,Massachusetts. Firstprinting,February2008 Contents SeriesEditor’sNote ............................................... xi Foreword .......................................................... xiii Preface ............................................................ xv Acknowledgments ................................................. xvii ABrief Historyof Qt .............................................. xix PartI: Basic Qt 1. GettingStarted ................................................. 3 HelloQt ...................................................... 3 MakingConnections........................................... 5 LayingOutWidgets ........................................... 6 UsingtheReferenceDocumentation ........................... 10 2. CreatingDialogs ................................................ 13 SubclassingQDialog .......................................... 13 SignalsandSlotsinDepth ..................................... 20 RapidDialogDesign........................................... 23 Shape-ChangingDialogs ...................................... 31 DynamicDialogs .............................................. 38 Built-inWidgetandDialogClasses............................. 39 3. CreatingMainWindows ........................................ 45 SubclassingQMainWindow .................................... 46 CreatingMenusandToolbars .................................. 50 SettingUptheStatusBar ..................................... 55 ImplementingtheFileMenu................................... 57 UsingDialogs ................................................. 63 StoringSettings............................................... 69 MultipleDocuments ........................................... 71 SplashScreens ................................................ 74 v 4. ImplementingApplicationFunctionality ...................... 77 TheCentralWidget ........................................... 77 SubclassingQTableWidget .................................... 78 LoadingandSaving ........................................... 84 ImplementingtheEditMenu .................................. 87 ImplementingtheOtherMenus................................ 91 SubclassingQTableWidgetItem ................................ 95 5. CreatingCustomWidgets ...................................... 105 CustomizingQtWidgets ....................................... 105 SubclassingQWidget .......................................... 107 IntegratingCustomWidgetswithQtDesigner .................. 117 DoubleBuffering .............................................. 121 PartII: Intermediate Qt 6. LayoutManagement............................................ 141 LayingOutWidgetsonaForm ................................. 141 StackedLayouts .............................................. 147 Splitters ...................................................... 149 ScrollingAreas................................................ 152 DockWindowsandToolbars ................................... 154 MultipleDocumentInterface .................................. 157 7. EventProcessing ............................................... 167 ReimplementingEventHandlers .............................. 167 InstallingEventFilters........................................ 172 StayingResponsiveduringIntensiveProcessing ................ 175 8. 2DGraphics..................................................... 179 PaintingwithQPainter ........................................ 180 CoordinateSystemTransformations ........................... 185 High-QualityRenderingwithQImage .......................... 193 Item-BasedRenderingwithGraphicsView ..................... 195 Printing ...................................................... 217 9. DragandDrop .................................................. 227 EnablingDragandDrop....................................... 227 SupportingCustomDragTypes ................................ 232 ClipboardHandling ........................................... 237 vi 10. ItemViewClasses ............................................. 239 UsingtheItemViewConvenienceClasses ...................... 240 UsingPredefinedModels ...................................... 247 ImplementingCustomModels ................................. 252 ImplementingCustomDelegates............................... 266 11. ContainerClasses ............................................. 273 SequentialContainers ......................................... 274 AssociativeContainers ........................................ 282 GenericAlgorithms............................................ 285 Strings,ByteArrays,andVariants ............................. 287 12. Input/Output .................................................. 295 ReadingandWritingBinaryData ............................. 296 ReadingandWritingText ..................................... 301 TraversingDirectories......................................... 307 EmbeddingResources ......................................... 308 Inter-ProcessCommunication .................................. 309 13. Databases ...................................................... 315 ConnectingandQuerying ..................................... 316 ViewingTables................................................ 322 EditingRecordsUsingForms .................................. 324 PresentingDatainTabularForms ............................. 330 14. Multithreading ................................................ 339 CreatingThreads ............................................. 340 SynchronizingThreads ........................................ 343 CommunicatingwiththeMainThread ......................... 349 UsingQt’sClassesinSecondaryThreads ....................... 356 15. Networking .................................................... 359 WritingFTPClients........................................... 359 WritingHTTPClients ......................................... 368 WritingTCPClient–ServerApplications ....................... 371 SendingandReceivingUDPDatagrams........................ 381 16. XML ............................................................ 387 ReadingXMLwithQXmlStreamReader ........................ 388 ReadingXMLwithDOM ...................................... 395 vii ReadingXMLwithSAX ....................................... 400 WritingXML ................................................. 404 17. ProvidingOnlineHelp ........................................ 407 Tooltips,StatusTips,and“What’sThis?”Help .................. 407 UsingaWebBrowsertoProvideOnlineHelp ................... 409 UsingQTextBrowserasaSimpleHelpEngine .................. 411 UsingQtAssistantforPowerfulOnlineHelp ................... 414 PartIII: Advanced Qt 18. Internationalization........................................... 419 WorkingwithUnicode ......................................... 420 MakingApplicationsTranslation-Aware ....................... 423 DynamicLanguageSwitching ................................. 429 TranslatingApplications ...................................... 435 19. LookandFeelCustomization ................................. 439 UsingQtStyleSheets ......................................... 439 SubclassingQStyle ............................................ 454 20. 3DGraphics ................................................... 471 DrawingUsingOpenGL ....................................... 471 CombiningOpenGLandQPainter ............................. 477 DoingOverlaysUsingFramebufferObjects ..................... 484 21. CreatingPlugins .............................................. 491 ExtendingQtwithPlugins .................................... 492 MakingApplicationsPlugin-Aware ............................ 502 WritingApplicationPlugins ................................... 505 22. ApplicationScripting ......................................... 509 Overviewof theECMAScriptLanguage ........................ 510 ExtendingQtApplicationswithScripts ........................ 519 ImplementingGUIExtensionsUsingScripts ................... 523 AutomatingTasksthroughScripting ........................... 530 23. Platform-SpecificFeatures .................................... 543 InterfacingwithNativeAPIs .................................. 543 UsingActiveXonWindows .................................... 547 HandlingX11SessionManagement ............................ 559 viii 24. EmbeddedProgramming ..................................... 567 GettingStartedwithQt/EmbeddedLinux ...................... 568 CustomizingQt/EmbeddedLinux .............................. 570 IntegratingQtApplicationswithQtopia ........................ 571 UsingQtopiaAPIs ............................................ 576 Appendixes A. Obtaining and Installing Qt ................................... 589 B. BuildingQtApplications ...................................... 593 C. IntroductiontoQtJambi ...................................... 605 D. IntroductiontoC++forJavaandC#Programmers ........... 623 Index .............................................................. 665 ix
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