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Groups > comp.lang.java.programmer > #38274

Re: how do you block the GUI repaints?

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On 2018-05-22 22:58, Eric Douglas wrote:
> On Tuesday, May 22, 2018 at 4:48:33 PM UTC-4, Daniele Futtorovic wrote:
>> On 2018-05-22 22:20, Eric Douglas wrote:
>>> JTextArea is my next big control.  Normally we just do one insert, as we just use it to display about a dozen lines of text at a time.  Now I'm trying to make a file viewer.  I tried loading a text file into any number of text file editors but they just crash because it's too big (email dump).  I wanted to see if I can load the whole thing at once into a JTextArea.  If not I want to get as much as possible, then I can remove text if necessary to add more, with first/previous/next/last buttons to scroll through the file.  I have no problem reading multiple chunks from any point in the file, but I can't call the JTextArea insert multiple times in a row without locking up the EDT because it wants to repaint every time.
>>>
>>
>> You'll obviously need to page through the file. Check out
>> java.io.RandomAccessFile.
> 
> I'm not specifically referencing RandomAccessFile, would that help anything?  I just read it like

Yes, seriously, it would. Have a look at the Javadoc
(<https://docs.oracle.com/javase/9/docs/api/java/io/RandomAccessFile.html>),
at the class definition, and search for usage examples if that's not enough.

Of course, that class will only come in handy if and when you give up on
the absurd notion of loading multi-gig files into RAM just in order to
show a couple lines of it. But then it most likely /will/ come in
handy... unless you have variable-length character encodings in it, in
which case you'd probably have to index the file before. But still.

-- 
DF.

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how do you block the GUI repaints? Eric Douglas <e.d.programmer@gmail.com> - 2018-05-22 10:59 -0700
  Re: how do you block the GUI repaints? Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2018-05-22 13:22 -0500
    Re: how do you block the GUI repaints? Eric Douglas <e.d.programmer@gmail.com> - 2018-05-22 13:00 -0700
      Re: how do you block the GUI repaints? Eric Sosman <esosman@comcast-dot-net.invalid> - 2018-05-22 16:29 -0400
        Re: how do you block the GUI repaints? Eric Douglas <e.d.programmer@gmail.com> - 2018-05-22 13:51 -0700
          Re: how do you block the GUI repaints? Martin Gregorie <martin@mydomain.invalid> - 2018-05-22 21:41 +0000
          Re: how do you block the GUI repaints? Eric Sosman <esosman@comcast-dot-net.invalid> - 2018-05-22 18:03 -0400
            Re: how do you block the GUI repaints? Andreas Leitgeb <avl@logic.at> - 2018-05-22 22:22 +0000
              Re: how do you block the GUI repaints? Eric Douglas <e.d.programmer@gmail.com> - 2018-05-23 07:55 -0700
                Re: how do you block the GUI repaints? Eric Sosman <esosman@comcast-dot-net.invalid> - 2018-05-23 11:06 -0400
                Re: how do you block the GUI repaints? Eric Douglas <e.d.programmer@gmail.com> - 2018-05-23 08:19 -0700
  Re: how do you block the GUI repaints? Eric Sosman <esosman@comcast-dot-net.invalid> - 2018-05-22 14:43 -0400
    Re: how do you block the GUI repaints? Eric Douglas <e.d.programmer@gmail.com> - 2018-05-22 13:20 -0700
      Re: how do you block the GUI repaints? Daniele Futtorovic <da.futt.news@laposte.net> - 2018-05-22 22:47 +0200
        Re: how do you block the GUI repaints? Eric Douglas <e.d.programmer@gmail.com> - 2018-05-22 13:58 -0700
          Re: how do you block the GUI repaints? Daniele Futtorovic <da.futt.news@laposte.net> - 2018-05-23 04:30 +0200
            Re: how do you block the GUI repaints? Eric Douglas <e.d.programmer@gmail.com> - 2018-05-23 05:54 -0700
              Re: how do you block the GUI repaints? Daniele Futtorovic <da.futt.news@laposte.net> - 2018-05-23 15:58 +0200
                Re: how do you block the GUI repaints? Eric Douglas <e.d.programmer@gmail.com> - 2018-05-23 07:26 -0700
                Re: how do you block the GUI repaints? Daniele Futtorovic <da.futt.news@laposte.net> - 2018-05-23 16:30 +0200
                Re: how do you block the GUI repaints? Eric Douglas <e.d.programmer@gmail.com> - 2018-05-23 07:48 -0700
                Re: how do you block the GUI repaints? Daniele Futtorovic <da.futt.news@laposte.net> - 2018-05-23 18:46 +0200
                Re: how do you block the GUI repaints? Eric Douglas <e.d.programmer@gmail.com> - 2018-05-23 10:51 -0700
                Re: how do you block the GUI repaints? Daniele Futtorovic <da.futt.news@laposte.net> - 2018-05-23 22:35 +0200

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