The book of qt 4 the art of building qt applications - phần 3 pptx
The book of qt 4 the art of building qt applications - phần 3 pptx
... usingthe Designer,which allowsthe basicgraphicalframeworkofmostapplications to be puttogether “bymouseclick” in Qt versions 4. 1and later .The basisofthisisthe QMainWindowQt class. 4. 1The Anatomy of ... key.Alternatively,while in thenormaldesignmode,you can setthe name of thede-siredBuddywidgetinthe PropertyEditor, usingthe Buddyproperty. 3 Using this ap-proach,wewould setthe value of th eBuddypropertyof theQLabelobject ... theirtoolswithinthe mainwindow.Ascan be seen in theexampleofthe Designer in Figure 4. 11, theusercandock them in thesamewayas toolbars to side areasofthe window,orpositionthem floatingover themainwindow.Iftheyaredocked,...
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Dojo Using the Dojo JavaScript Library to Build Ajax Applications phần 3 pptx
... give you a goodidea of the breadth of the Dojo widget set .The widgets are divided into general cate-gories that correspond to the way the widgets are packaged. Most of these widgets havenumerous ... on the calendar .The user can flipthrough the calendar by clicking the back and forward arrows in the upper left and right of the calendar.When the desired date is visible on the calendar, the ... containing the element’s name and its value at the time the form wassubmitted. If the form method is “POST,” then these name/value pairs are hidden in the body of the HTTP request, and if the form...
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molkentin-the book of qt 4-the art of building qt applications
... andProcessing XMLFiles 36 7 13. 2.2Searching for SpecificElements 37 0 13. 2.3Manipulatingthe DOMTree 37 1 13. 2. 4The DOMTreeasXML Output 37 211Daniel MolkentinTheBook of Qt 4 TheArt of BuildingQtApplications®Munich ... 33 211.5.1NameResolutionwithQHostInfo 33 311.5.2Using QTcpServer andQTcpSocket 33 312 Threading with QThread 337 12.1Using Threads 33 812.2SynchronizingThreads 34 1 12.2. 1The Consumer/ProducerPattern. 34 2 12.3Thread-dependentDataStructures ... building Qtapplications/byDaniel Molkentin 1st ed.p. cm.Includesindex.ISBN- 139 7 8-1 -5 932 7- 147 -3 ISBN-10 1-5 932 7- 147 -6 1 .Qt( Electronic resource)2.Graphicaluserinterfaces(Computersystems) 3. Application...
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The book of qt 4 the art of building qt applications - phần 1 ppt
... recycled paper Qt 4 Qt 4 THE ART OF BUILDING Qt APPLICATIONS DANIEL MOLKENTIN THE BOOK of THE BOOK of Qt 4 THE BOOK of THE BOOK of Qt 4 ®MOLKENTIN1 Basics,Tools, and First CodeSeveral Qt classeshaveQObject ... thechosencategory.Whenthe user changesthe categoryon the 34 Contents 4. 3. 3Integrating theMainWindowwithYourSourceCode 110 4. 4Making theMostofthe Status Bar 118 4. 4.1TemporaryMessages 120 4. 4.2NormalMessages. 120 4. 4.3Permanent ... 36 1.4BaseClassesinQt 39 1 .4. 1ClassesDerived from QObject 39 1 .4. 2QString andOther Classesnot Derived from QObject 40 1 .4. 3The Qt InheritanceHierarchy 41 1.5QtataGlance 42 1.5. 1The Qt Libraries 42 1.5.2Toolsand...
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The book of qt 4 the art of building qt applications - phần 2 docx
... nowByteConverterDialogdecEdittextChanged()setText()hexEdittextChanged()setText()binEdittextChanged()setText()decChanged()hexChanged()binChanged()We can connect thesignals andslots of theline-edit widgets from theByteCon-verterDialog to thesignals andslots of theByteConverter class, for example, the hexChanged()signalofthe decEdit object ... implements both thegraphical interfaceand theprocessing logicfor theap-plication: If theuserchanges thevalue in oneofthe line-edit widgets ,the Byte-ConverterDialog classcalls thecorresponding ... enter them in theIndextaboftheAssistant. From thestart page you can also accessalistofall classesand alistgroupedaccordingtotopics.20ForQt4.1,see http://doc.trolltech.com /4. 1/.592 TheToolsNeeded...
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The book of qt 4 the art of building qt applications - phần 4 pot
... ClickSplitterHandle::mouseDoubleClickEvent()wefirstdetermine thealignment of thesplitter.Weobtainthe positionofthe splitter,using theQSplitter::indexOf()method. This is also thepositionofthe widgetlyingtothe rightof(or directlybeneath) thesplitter.Forreasons ... as the rstargu-ment,thenthe dialog willnot be modal .The nexttwoargumentsare thedialogheading andthe startdirectory.TheQDirclass provides static methods for retrievingthe paths to themostim-portant ... addsama rgin for thelayoutand fixes thewindowsizetothetotal.Figure 5 .3: ThewidgetwithaverticallayoutFigure 5.3clearlyshowsthe weaknessesofthe vertical layout: Thebuttontakesover thefullwidth,which...
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The book of qt 4 the art of building qt applications - phần 5 pptx
... query.Thisisfollowed bythelistofstrings to be displayed.Thencomesthe indexof thelistele ment that thedrop-downwidgetdisplaysatthe be-ginning .The next-to-lastparameter specifies whether theusercan add ... HTML) Qt: :SizeHintRole Sizehintfor theelement;isforwardedtotheviews(QSizeHint) Qt: :FontRole Font type for renderingthe DisplayRole Qt: :TextAlignmentRole Alignment of thetextofthe DisplayRole Qt: :BackgroundColorRoleBackground ... enumeratorarevalid :Qt: :Unchecked, Qt: :PartiallyChecked,1or Qt: :Checked Qt: :AccessibleTextRole Screenreaderorother accessibilitytoolsout-putthistext; an examplefor theAccessible-Role is thetextdescription of...
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The book of qt 4 the art of building qt applications - phần 6 doc
... weconstruct thedescription of theaddressbook entryusingthe <table>tag. Each rowof thetable consists of twocells,one of which contains thenameofthe address book field (the key)andtheother ,the matching ... addi-tion to theissueofdistinguishabilityduring thedropprocedure.Theother side of th edrag-and-drop procedureishandled bythedropMimeData()method. Apartfromthe MIME data,italsocontainsthe type of drop: ... “Interview”Q_UNUSED(parent);returnaddressBook.count() -2 ;}To determine thenumber of columns,welook at thedataset from th efirstlineoftheCSV file. TheQStringList::cou nt() method is used to determine thenumber of stringsinthe string...
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The book of qt 4 the art of building qt applications - phần 7 pot
... nowconnect theclicked()signalofthe Screenshot!buttontothe slot thatprepares thescreenshot,and thesignalofthe Printbuttontothe slot that enablestheconfiguration of theprintingparameters. Then wecallgrabDesktop(), ... combinebothvalueswitheach other. If such an opera-torisset, this changesthe compositionmode in theQPainter.Forthistofunction ,the QImage mustuse theFormat_ARGB32_PremultipliedortheFormat_ARGB32.Ifthisisnot thecase, ... determine the diameter via pieRect(). So that the gradient later “creases” the edge of the pie chart circle, thus creating the impression of spatial depth, we place the focus to the edge of the upper...
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The book of qt 4 the art of building qt applications - phần 8 doc
... QStringobjects,making useofthe toLocal8Bit()method internally.11.4Startingand ControllingProcessesNowandagainyou maywanttomake useofthe services of command-linebasedprograms, particularlyon Unix-based operating ... {produceMessage();msleep((rand() %30 00)+1);} ;}} ;In thecritical sectionwecheck whether thereisstill room in thequeue.Ifthisisnotthe case, thewaitcondition comesintoforce .Since themutexmustnot beblockedduringthe waiting ... g_queueNotEmptywakesthe sleepingcon-sumerwhenthere areelementsavailable in thequeue:// producerconsumer/producerconsumer.cpp#include <QtCore> 34 2 11 .3 SerializingObjectsTo serializethe dataofaQByteArray,therefore,...
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