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首页 exampleshelpsystemhelpsystem

exampleshelpsystemhelpsystem.doc

exampleshelpsystemhelpsystem

小安
2018-09-05 0人阅读 举报 0 0 暂无简介

简介:本文档为《exampleshelpsystemhelpsystemdoc》,可适用于IT/计算机领域

*!pagehelpsystemexamplehtmlingroupexamplestitleHelpsystemThisexampledemonstratesthedifferentQtclassesthatcanbeusedtoprovidecontextsensitivehelpinanapplicationItusesQToolTipandQWhatsThistoprovidebothstaticanddynamicballoonhelpforthewidgetsintheapplication,andQToolTipGrouptodisplayextendedinformationforeachtooltipinthestatusbarQAssistantClientisusedtodisplayhelppagesusingQtAssistantTheapplicationhasauserinterfacebasedonaQMainWindowwithamenubar,statusbarandatoolbar,andusesaQTableasthecentralwidgetquotefilehelpsystemtooltiphskipto:publicQToolTipprintuntil}TwoQToolTipsubclassesimplementdynamictooltipsforQHeaderandQTablebyreimplementingmaybeTip()TheconstructorsdifferfromtheQToolTipconstructorinhavingaQHeaderandaQTablerespectivelyasthefirstparameterfortheconstructorinsteadofaQWidgetThisisbecausewewanttoensurethatonlyheadersandtablescanbepassedasargumentsAQToolTipGroupcanbeprovidedasthesecondargumenttoshowtooltipsin,forexampleastatusbarprintuntil}TheTableToolTipclasskeepsareferencetotheQTableasamemberforeasieraccessoftheQTableobjectlateronquotefilehelpsystemtooltipcppskiptoHeaderToolTip::HeaderToolTipprintuntil}TheHeaderToolTipconstructorpropagatestheparameterstotheQToolTipconstructorprintuntil}TheimplementationofmaybeTip()usestheQHeaderAPItogetthesectionattherequestedpositionandusesQToolTip::tip()todisplaythesection'slabelinatooltipThesecondstringisusedbyQToolTipGroupandwillshowupinthestatusbarprintuntil}SinceQTableisaQScrollViewalluserinteractionhappensonQTable'sviewport()TheTableToolTipconstructorpassestheviewport()andthetooltipgrouptotheQToolTipconstructor,andinitializesthetablememberwiththeQTablepointeritselfprinttomoveTopLeftTheimplementationofmaybeTip()usestheQTableAPItogetinformationaboutthecellattherequestedpositionTheQTableAPIexpectscontentscoordinates,andsincetherequestedpointisrelativetotheviewportweneedtotranslatethecoordinatesbeforewecanuseQTable'sfunctionsprintuntil}quotefilehelpsystemwhatsthishskiptoclassWhatsThisWetranslatethecell'sgeometrybacktoviewportcoordinatessothatthetooltipdisappearswhenthemousecursorleavesthecell,anduseQToolTip::tip()todisplaythecell'slabelinatooltipandtoprovidetextfortheQToolTipGroupasbeforeprintuntil}quotefilehelpsystemwhatsthiscppskiptoWhatsThis::WhatsThisTheWhatsThisclassisasubclassofbothQObjectandQWhatsThisandservesasabaseclassfortheHeaderWhatsThisandTableWhatsThisclassesfootnoteNotethatmocrequiresthatQObjectisthefirstbaseclassendfootnoteWhatsThisreimplementsclicked()whichwillbecalledwhentheuserclicksinsidethe"What'sthis"windowItalsodeclaresasignallinkClicked()whichwillbeemittedwhenahyperlinkisclickedprintuntil}TheWhatsThisconstructortakestwoparameters,thefirstisthewidgetwewanttoprovideWhatsThisfor,andthesecondistheonewhichreceivestheeventsNormallythisisthesamewidget,butsomewidgets,likeQTable,aremorecomplexandhaveaviewport()widgetwhichreceivestheeventsIfsuchawidgetispassedtotheconstructoritwillpropagatetheparametertotheQWhatsThisconstructorandstoretheQWidgetpointeritselfinit'smembervariabletoalloweasieruseoftheQWidgetAPIlateronskiptoboolWhatsThis::clickedprintuntil}quotefilehelpsystemwhatsthishskiptoclassHeaderWhatsThisTheimplementationofclicked()emitsthelinkClicked()signalifahyperlinkhasbeenclickedprintuntil}printuntil}quotefilehelpsystemwhatsthiscppskiptoHeaderWhatsThis::HeaderWhatsThisTheHeaderWhatsThisandTableWhatsThisclassesreimplementtext()tomakeitpossibletoreturntextsdependingonthemouseclick'spositionAlltheotherfunctionalityisalreadyprovidedbythegenericWhatsThisbaseclassWeensuretypesafetyhereinthesamemannerasinthetooltipclassesprintuntil}TheHeaderWhatsThisconstructorpropagatestheparametertotheWhatsThisconstructorprinttoTableWhatsThis::TableWhatsThisTheimplementationoftext()usestheQHeaderAPItodeterminewhetherwehaveahorizontaloraverticalheaderandreturnsastringwhichstatestheheader'sorientationandsectionfootnoteNotethatwehavetoexplicitlyscopetheorientation(QObjectorQWhatsThis)sinceHeaderWhatsThisusesmultipleinheritanceendfootnoteprintuntil}SinceQTableisascrollviewandhasaviewport()whichreceivestheevents,wepropagatethetableitselfandthetable'sviewport()totheWhatsThisconstructorprintuntil}printuntil}printuntil}printuntil}Theimplementationoftext()usestheQTableAPItogetinformationaboutthecellattherequestedpositionTheQTableAPIexpectscontentscoordinates,soweneedtotranslatethepointasshownearlierforthetooltipclassesWeusethertti()functiontofigureouttheitem'stypeandreturnastringaccordinglyquotefilehelpsystemmainwindowhskiptoclassMainWindowprintuntil}AQMainWindowisusedtocreateauserinterfacethatusestheaboveclassesinadditiontoQtAssistanttoprovidecontextsensitivehelpintheapplicationTheMainWindowclassdeclaresaslotcalledassistantSlot()whichcreatesaninstanceofQtAssistantwhenitiscalledTheclasskeepsreferencestothetooltipclassesasmembersbecausetheyarenotQObjectsandneedtobedeletedexplicitlyTheclasshasareferencetoQAssistantClientasamemberaswell,toalloweasieraccesstoQtAssistantlateronquotefilehelpsystemmainwindowcppskiptoMainWindow::MainWindowprintuntilassistantTheMainWindowconstructorcreatesaninstanceofQAssistantClientusingQString::asthefirstargumentsothatthesystempathisusedprinttoQWhatsThis::whatsThisButtonAQTableisusedasthecentralwidgetandthetable,themenusandthetoolbararepopulatedprinttocreateThestaticfunctionwhatsThisButton()createsaQToolButtonwhichwillenter"What'sthis"modewhenclickedprinttosetupAQToolTipGroupiscreatedandwillshowandremovetooltipsinthestatusbarasthetooltipsaredisplayedonthewidgetsprinttosetupwhatsthisThetooltipsaresetupThestaticfunctionadd()setsupatooltipontheAssistanttoolbuttonTooltipobjectsarecreatedusingtheQToolTipsubclasses,theconstructor'sfirstparameterspecifiesthewidgetwewanttoadddynamictooltipsforandthesecondargumentspecifiestheQToolTipGrouptheyshouldbelongtoprinttoconnectionsTheWhatsThishelpissetupThestaticfunctionadd()addsWhat'sThishelpforthetoolbuttonwhichopensAssistantInstancesofthetwoWhatsThissubclassesarecreatedfortheheadersandthetableWhat'sThishelpisalsoaddedforthemenuitemsprinttoMainWindow::~MainWindowSignalsandslotsareconnected,sothattherelevantpageswillbedisplayedinQtAssistantwhenclickingonahyperlinkorontheassistantbuttonprintuntil}ThedestructordeletesthetooltipsWeneedtodeletethetooltipsexplicitlysinceQToolTipis,asmentionedabove,notasubclassofQObjectandtheinstancesofQToolTipnotwillbedeletedwhenthewidgetisdeletedprintuntil}TheassistantSlot()usesapplicationDirPath()tofindthelocationofthedocumentationfilesandshowsthespecifiedpageinQtAssistantquotefilehelpsystemmaincppskipto#includeprintuntil}ThemainfunctionisastandardimplementationopeningtheapplicationmainwindowTobuildtheexamplegotothehelpsystemdirectory(QTDIRexampleshelpsystem)runqmaketogeneratethemakefile,andusethemaketooltobuildthelibrary*

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