AllowingUserInteraction—IntegratingtheMouseandKeyboardinYourApplicationContd..Today’sTopicsUnderstandingMouseEventsMOUSEEVENTMESSAGESContd..DrawingwiththeMouseContd..Contd..Contd..THEOnMouseMoveFUNCTION.CodeExplanationContd..ThedevicecontextContd..Drawingonthewindowwiththemouse.ImprovingtheDrawingProgramStepstobefollowed..Contd..THEREVISEDOnMouseMoveFUNCTION.Contd..Contd..Thedrawingprogramwithapeculiarbehavior.AddingtheFinishingTouchesTHEOnLButtonDownFUNCTIONApplicationCompliedandRunCapturingKeyboardEventsChangingtheDrawingCursorContd..THEOnKeyDownFUNCTIONContd..Contd..Contd..CodeexplanationContdContd..Contd..CompileandRunProblemtobesolved?SolutionFIGURE3.6.Definingaclassmembervariable.Contd..//MYCODESTARTSHERE//Initializethecursortothearrowm_bCursor=FALSE;//MYCODEENDSHEREreturnTRUE;//returnTRUEunlessyousetthefocustoacontrol}3.AltertheOnKeyDownfunctiontosetthem_bCursorflagtoTRUEwhenyouchangethecursor,asinListing3.6.THEOnKeyDownFUNCTION.Contd..Contd..//Isthecharacter“X”if(lsChar==‘X’){//LoadthearrowcursorlhCursor=AfxGetApp()->LoadStandardCursor(IDC_ARROW);//Setthecursorflagm_bCursor=TRUE;//SetthescreencursorSetCursor(lhCursor);//ExittheapplicationOnOK();}Contd..else{//Setthecursorflagm_bCursor=TRUE;//SetthescreencursorSetCursor(lhCursor);}CDialog::OnKeyDown(nChar,nRepCnt,nFlags);}4.UsingtheClassWizard,addafunctionfortheWM_SETCURSORmessageonthedialogobject.5.EdittheOnSetCursorfunctionthatyoujustcreated,addingthecodeinListing3.7.LISTING3.7.THEOnSetCursorFUNCTION.CodeExplanationTheOnSetCursorfunctionneedstoalwaysreturnTRUEorelsecalltheancestorfunction.Theancestorfunctionresetsthecursoranddoesneedtobecalledwhentheapplicationfirststarts.Becauseofthis,youneedtoinitializeyourvariabletoFALSEsothatuntiltheuserpressesakeytochangethecursor,thedefaultOnSetCursorprocessingisexecuted.Whentheuserchangesthecursor,youwanttobypassthedefaultprocessingandreturnTRUEinstead.Thisallowstheusertodrawwithwhichevercursorhasbeenselected,includingthehourg