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JTextPane and handling insertions of a large string.

steve labar
Ranch Hand

Joined: Sep 10, 2008
Posts: 55
I'm having a difficult time trying to optimize the adding of a large file to a JTextPane. I have searched everywhere on the internet and cannot seem to find anything that looks feasible. One site mentions removing the JTextPane's document while insertions are being done to avoid any unnecessary updates. I tried this but it did not seem to help much.

What I'm thinking of doing is creating the zone model where i load a chunk of the data and listen for the user to reach the end of the scrollbar. At that point I add another chunk to the pane.

I have that functionality working fine. However, I would like to make the insertion of text much more efficient. Anyone have any tips how to speed things up?

- I grab text from file and put into a string > mb - this is fine

- I then call pane.settext(string) -> this is where things really hang.
Rob Spoor

Joined: Oct 27, 2005
Posts: 20275

Perhaps you can import the file in smaller chunks, using a SwingWorker:
This example reads the file line by line. Perhaps you can read pieces of X characters, having X some kind of constant that's large but not too large.

By using a SwingWorker like this you will not have one large update to the document but several smaller ones. The effect should be a somewhat more responsive user interface.

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