java - How to switch between lines in JTextArea in swing -


am trying set goto line number switching between lines in swing application. got number of lines in jtextarea instance using getlinecount() don't know how switch between lines?

could 1 suggest me?

you can set caret position textarea.setcaretposition. work

textarea.setcaretposition(textarea.getdocument().getdefaultrootelement()                          .getelement(index).getstartoffset());

in example below, use jcombobox populate indexes using line numbers of jtextarea. when select on number in combo box, caret move line of jtextarea.

the program not great program though. want populate comboboxmodel dynamically addition , removal of lines. should give answer you're looking for.

disclaimer

i haven't added functionality bring scrollpane focus the current line. may want @ @balder comment below that.

enter image description here

import java.awt.*; import java.awt.event.*; import javax.swing.*;   public class testcaret {      public testcaret() {         jtextarea textarea = createtextarea();         jcombobox cbox = createcombobox(textarea);          jframe frame = new jframe();         frame.add(new jscrollpane(textarea));         frame.add(cbox, borderlayout.south);         frame.setdefaultcloseoperation(jframe.exit_on_close);         frame.pack();         frame.setlocationrelativeto(null);         frame.setvisible(true);     }      private jcombobox createcombobox(final jtextarea textarea) {         defaultcomboboxmodel<integer> model  = new defaultcomboboxmodel<>();         int lines = textarea.getlinecount();         (int = 0; < lines; i++) {             model.addelement(i);         }         final jcombobox cbox = new jcombobox(model);         cbox.addactionlistener(new actionlistener(){             public void actionperformed(actionevent e) {                 int index = (integer)cbox.getselecteditem();                 textarea.setcaretposition(                         textarea.getdocument().getdefaultrootelement().getelement(index).getstartoffset());                 textarea.requestfocusinwindow();             }         });         return cbox;     }      private jtextarea createtextarea() {         jtextarea textarea = new jtextarea(10, 50);         textarea.setmargin(new insets(15, 15, 15, 15));         textarea.setlinewrap(true);         textarea.setwrapstyleword(true);         string text                  = "0 hello world\n" +                  "1 hello world\n" +                  "2 hello world\n" +                  "3 hello world\n" +                  "4 hello world\n" +                  "5 hello world\n" +                  "6 hello world\n" +                 "7 hello world\n" +                  "8 hello world\n" +                  "9 hello world\n";          textarea.settext(text);         return textarea;     }      public static void main(string[] args) {         swingutilities.invokelater(new runnable(){             public void run() {                 new testcaret();             }         });     } }

Comments

Post a Comment

Popular posts from this blog

user interface - How to replace the Python logo in a Tkinter-based Python GUI app? -

is there way change default logo, python logo , appears in window's task bar? notice have replaced default tk logo used appear in application window. i using windows 7 , python 2.6 , developing gui of tkinter. you can using winico tk extension package. winico package can used add system tray icons tk programs. the following sample shows 1 way change runtime application icon. note need provide .ico file suitable sizes of icons in on command line , need use pythonw. not change taskbar icon console when running python script. test extracted winico0.6 package python\tcl\winico0.6 folder package require winico work , ran code below using pythonw winico_test.py path\to\some\ico\file.ico . import sys tkinter import * def main(argv): root = tk() root.update() root.tk.call('package','require','winico') id = root.tk.call('winico','createfrom',argv[1]) root.tk.call('winico','setwindow',root,id...
Read more

objective c - Greedy NSProgressIndicator Allocation -

i'm using bunch of nsprogressindicators @ once (32 exact) , looks when they're animating start allocating memory no one's business greedy_run http://i62.tinypic.com/15rgmso.png i've got reports app slowdown , crash after days of uptime, , looks culprit, it's hard pinpoint bugs take days appear. i comment out call start animating, memory behaves expected. result of multiple nsprogressindicators alloc'ed on same thread? or maybe sandboxing? of constant allocations coming core animation threads, don't know else going on. custom nsview progress indicator lives in @interface myview () @property (nonatomic, strong) nsimageview *imageview; @property (nonatomic, strong) nstextview *numbertxt; @property (nonatomic, strong) nsprogressindicator *progress; @end @implementation myview - (id)initwithframe:(nsrect)framerect { self = [super initwithframe:framerect]; if (self) { // image nsimage *image = [nsimage imagenamed:@"bg.png"]; c...
Read more

how to set an OCR language in Google Drive -

i need upload image google drive including ocr feature. the problem setocrlanguage method. need specify hebrew language , based on iso 639-1 codes should "heb". i'm getting response "code" : 400, "errors" : [ { "domain" : "global", "location" : "ocrlanguage", "locationtype" : "parameter", "message" : "invalid value", "reason" : "invalid" } ], any idea should code or can list of avaliable codes?
Read more