java - efficient way to color text in JTextPane -


i have problem regarding coloring keywords in jtextpane. in other words, want make mini ide write code , want give color (say blue) keywords "public" "private" ... etc. problem is slow !! each time hit "space" or "backspace" key function scans whole text give color keywords, when write lot of code in textpane gets slow. here function of matching keywords:

public void matchword() throws badlocationexception {         string tokens[] = arabicparser.tokennames;         int index = 0;         string textstr[] = textpane.gettext().split("\\r?\\n");         for(int i=0 ; i<textstr.length ; i++) {             string t = textstr[i];             stringtokenizer ts2 = new stringtokenizer(t, " ");             while(ts2.hasmoretokens()) {                 string token = ts2.nexttoken();                  // iterations reduced removing 16 symbols search space                 for(int j = 3 ; j<tokens.length-5 ; j++) {                     if(!(token.equals("؛")) && (tokens[j].equals("'"+token+"'"))) {                         changecolor(textpane,token,color.blue,index,token.length());                         break;                     } else {                         changecolor(textpane,token,color.black,index,token.length());                     }                 }                 index += token.length() + 1;             }             //index -= 1;         }     }

and here function of coloring matched words:

private void changecolor(jtextpane tp, string msg, color c, int beginindex, int length) throws badlocationexception {         simpleattributeset sas = new simpleattributeset();          styleconstants.setforeground(sas, c);         styleddocument doc = (styleddocument)tp.getdocument();         doc.setcharacterattributes(beginindex, length, sas, false);         sas = new simpleattributeset();          styleconstants.setforeground(sas, color.black);         tp.setcharacterattributes(sas, false);     }

and in advance =)

consider replacing stringtokenizer since it's modern use discoraged https://stackoverflow.com/a/6983908/1493294

consider refactoring string tokens[] hashset<string> tokens. hash lookup faster looping, tokens[] gets large.

if you'd use more 2 colors try hashmap<string, color> tokens.

also, having 2 different things called token , tokens running around in here confusing. consider renaming tokens[] colorednames[] it's different token textpane tokens.

consider using profiler see bulk of time being spent. might find repetitive work being done in changecolor() worth caching.

if write class called colorchanger. colorchanger have 1 constructor , 1 method changecolor(). constructor take (and cache) parameters don't change loop. colorchanger.changecolor() take parameters change loop.


Comments

Post a Comment

Popular posts from this blog

powershell Start-Process exit code -1073741502 when used with Credential from a windows service environment -

i'm running strange behavior powershell start-process call. here call: $process = start-process ` "c:\somepath\mybinary.exe" ` -passthru ` -credential $defaultcredential ` -wait ` -workingdirectory "c:\somepath" ` -loaduserprofile if ($process.exitcode -ne 0) { #do } this call return exit code - 1073741502 . after quick search, exit code seems related generic error when program not load required dll (aka. status_dll_init_failed ). when run without -credential $credential program runs correctly. in order isolate problem, manually launched some.exe in prompt target credential , runs smoothly. so problem seems come way start-process cmdlet launch process. i found potential solutions problem tried apply no luck : link , link . would have idea of what's going on here ? edit 1: run proc mon monitoring program activities when launched directly or via powershell script. problem seems occur when loading kernelbase
Read more

twig - Using Twigbridge in a Laravel 5.1 Package -

i'm trying create laravel 5.1 package uses twigbridge instead of .php views. can normal .php views display fine, when try make use of .twig templates i'm met error. possible use twigbridge templates when creating views laravel package or pretty stuck blade , php ? edit 1: loading twig template without extending works. it's when start using {% extends 'file' %} error comes out. i error error loading /virtual/laravel/packages/username/mypackage/src/views/sample.twig: template "templates.master" not defined () in "/virtual/laravel/packages/username/mypackage/src/views/sample.twig" @ line 1. my folders username |_ mypackage |_ src |_ controllers - samplecontroller.php |_ views |_ templates - master.twig - sample.twig twig template sample.twig {% extends 'templates.master' %} {% block content %} {{ parent()
Read more

c# - LINQ join Entities from HashSet's, Join vs Dictionary vs HashSet performance -

i have hashset's each stores t, have written test application compares different relation algorithms can think of, i'm not pleased results getting. does there exist more efficient ways of achieving object relations, once testing? using system; using system.collections.generic; using system.linq; using system.text; using system.threading.tasks; using system.diagnostics; namespace linqtests { class program { static void main(string[] args) { hashset<user> usertable = new hashset<user>(); hashset<userproperty> userpropertytable = new hashset<userproperty>(); #region lets create dummy data. console.writeline("please wait while creating dummy data, can take while..."); console.writeline(""); int rows = 1000000; for(int x = 0; x < rows; x++) { random rnd = new random(); // ad
Read more