Build A XML TextEditorWord格式文档下载.docx

Build A XML TextEditorWord格式文档下载.docx

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Youcandothisasfollows:

1.File->

New->

Project...

2.SelectPlug-inProject

Thenfollowthewizardscreenuntilyougettothe 

Templates 

selectionasshownbelow:

Hereyouchecktheboxtocreatetheplug-inusingoneofthetemplates,andselectthetemplatePlug-inwithaneditor.EclipseverykindlygeneratesforyouaworkingXMLeditor,albeitonewhichdoesverylittle.

TheXMLeditorwhichEclipsegenerateslookslikethis:

Ofcourse,yougetallthesourcecode,andthegeneratedapplicationisquitenicelywritten,soitmakesanexcellentstartingpointforlearningthenewtechnology.TheXMLeditorisclearlymorethanjustatexteditor–ithassyntaxhighlighting.What'

smissingthough,aresomereallyusefulfeatures:

∙errormarking.Ifwemodifyourdocumentreplacingsomeofthemarkupwithrandomtext,wewantvisualcluesthatthedocumentisnotwell-formed.NormallyEclipsedoesthisbysquigglyredlinesundertheoffendingtext,anerroricononthelefthandruler,andanentryinthe'

Problems'

view

∙contentassist.We'

vegotaDTD,sowhycan'

tthetoolusethistofigurewhatbitsoftextyoucouldaddtoaparticularpartofthedocument?

∙acontentoutline.Eclipsetypicallyusesthe'

Outline'

viewtoprovideavisual（usuallytree-based）representationofourdocument,whichwecanusetonavigateeasilybetweendifferentpartsofthedocument.We'

dliketobeabletousethismechanism

∙formattingsupport.Wewantbeabletoformatsomeoneelse'

s（orourown）messyXMLintoanicelylaidoutdocument.Ideally,weevenwanttobeabletoformatpartofourdocumentinisolation

∙moresyntaxhighlightingoptions.Thebasictexteditoronlyprovidescolourdifferentiationforelementsandattributes.Whatifwewanttorepresentotherpartsofourdocumentinthisway?

Soyouwantallofthesefeaturesandmore,andwhatyouhaveisthebasictexteditorsource,wheredoyougofromhere?

That'

swhatthisarticleisallabout.Iamnoexpert.Hopefully,however,Ihavelearntenoughtoknowwhatiseasytoachieve,andgivesomehelpfulindicationsonhowtoaccomplishthemoredifficultbits.

Youcanuse 

thislinktodownloadthefullsourcecodeonwhichthisarticleisbased.

Part2:

GettingtoKnowJFaceText

TextEditors

TheJFaceTextframeworkisordinarilyusedwithanEclipsetexteditor,forwhichtheabstractbaseclassisa 

AbstractTextEditor 

（packageandpluginname）.Normally,itwouldbemostconvenienttosubclassTextEditor,whichiswhattheprovidedXMLeditordoesinaclassnamed 

XMLEditor.

TheEclipseprovided 

XMLEditor 

classitselfdoesdoesnotdomuch–itsimplyusesthebaseclassfunctionality,anddelegatesthejobofaddingadditionalfeatures.

publicclassXMLEditorextendsTextEditor

{

privateColorManagercolorManager;

publicXMLEditor（）

{

super（）;

colorManager=newColorManager（）;

setSourceViewerConfiguration（newXMLConfiguration（colorManager））;

setDocumentProvider（newXMLDocumentProvider（））;

}

publicvoiddispose（）

colorManager.dispose（）;

super.dispose（）;

}

Itsfirstdelegateisa 

SourceViewerConfiguration 

classinstance,whichisusedtoaddadditionalfeaturestotheeditor'

suserinterface.Thesecondisaninstanceofthe 

IDocumentProvider 

interface,whichencapsulatesthemechanismforcreatingaJFaceTextrepresentationofthedocumentbeingeditedfromitssource（suchasafileinthefilesystem）.Understandinghowtousethe 

andtheDocumentProvider 

isnecessary,sowewillcoverbothlaterinthearticle.

WewillalsoseethatwhenaddingadditionalfeaturestotheXMLeditor,suchaserrormarkingandcontentoutlining,wewillalsoneedtoaddsomeenhancementstotheXMLeditorclass.

JFaceTextDocuments

WhenworkingwithJFaceText,thedocumentyouareeditingworkswithan 

IDocument 

instance.The 

containsthetextofyourdocument,andcanbeusedtoqueryitsstructure.The 

canalsobeusedtomarkforpositionsinthedocument,whichtheframeworkcanusetostoredocumentpartitioninformationandothermetadata,suchashighlightingranges.We'

lllearnmoreaboutdocumentpartitioninglaterinthearticle.Positionsarestoredindocumentsasinstancesofthe 

Position 

classorsubclasses.

Yourapplicationprobablywon'

toftenneedtouseanythingotherthanthedefaultprovided 

implementations.Alltheprovided 

implementationsarealsopartition-aware,thatis,canbedividedintonon-overlappingregionsoftext.PartitionsplayanimportantroleinJFacetext,sowewillbecoveringtheminsomedetaillaterinthearticle.

The 

interfaceisdesignedtoworkwithoutanyknowledgeofhowitisstored.Thatis,an 

instancehasnoknowledgeofwhetherithasbeenloadedfromthefilesystem,fromadatabaseorfromanyothersource.Thejobofcreatingthedocumentinstanceandinitiatingtheprocessthatsetsthedocumentsinitialstateisthejobofthe 

IDocumentProvider.Eclipseprovidesexcellentoutoftheboxsupportformloadingdocumentsfromthefilesystem,throughthe 

FileDocumentProvider 

class.

Wesawwhenintroductingthe 

classhowthe 

instanceismadeavailabletotheeditor.Wecannotsimplyusethe 

asis,becausethe 

FileDocumentProviderhasnoknowledgeofourplugin'

spartitioningscheme.

TheXMLeditor'

sdocumentproviderremediesthisbyoverridingonlyonemethod– 

createDocument（） 

-withthefollowingcode:

protectedIDocumentcreateDocument（Objectelement）throwsCoreException

IDocumentdocument=super.createDocument（element）;

...

returndocument;

UnlessyoualreadyknowJFaceText,therewouldbenopointatthisstagedescribingthecodethatgoesinthismethod,excepttosaythatinadditiontotheinheritedbehaviour,itconfiguresthedocument'

spartitioningmechanism.Atthisstage,youmaynotbeveryclearonwhatpartitioningis,orhowitworks.SincepartitioningissocentraltothewayJFaceTextworks,wewillnowtalkaboutitinabitmoredetail.

Partitioning

WhenyouopenadocumentwhichusesJFaceText,theframeworkdividesthedocumentintopartitions,thatis,aregionoftextwithinthedocument.Thesepartitionsarenon-overlapping.Thepartitionsarecategorised,sothateachpartitionisassociatedwithaparticular"

contenttype"

.

Theeasiestwaytounderstandpartitioningisbyviewinganexample.Ihaveaddedasimplemechanismtoeasilyprintthedocumentpartitioningtotheconsole,whichIwilldescribelater.Fornow,weareconcernedabouthowthedocumentispartitioned.

Below,wehaveanabridgedversionofthepartitioningforthedocumentshownabove.

Partitiontype:

__xml_pi,offset:

0,length:

21

Text:

<

?

xmlversion="

1.0"

>

---------------------------

__dftl_partition_content_type,offset:

21,length:

2

__xml_doctype,offset:

23,length:

36

!

DOCTYPEworldSYSTEM"

cities.dtd"

59,length:

__xml_start_tag,offset:

61,length:

7

world>

68,length:

5

73,length:

27

continentname="

Africa"

100,length:

4

--------------------------

104,length:

13

description>

...restofdocumentuntilend...

__xml_end_tag,offset:

1301,length:

8

/world>

Noticeafewthingsaboutthedocument'

spartitioning:

∙fromthedocumentoffsetsforeachpartition,wecanseethattheyarenon-overlapping

∙eachpartitionhasapartitiontype.Bydefault,thepartitiontypeis 

__dftl_partition_content_type.Here,thecontenttypehasnotbeenspecified

∙Ifwescanthroughthelisting,weseethatthereareonlytwootherpartitiontypes:

__xml_tag 

an