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MDI performance problem with JInternalFrames

Posted on 2001-07-09
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Last Modified: 2012-06-21
I'm creating an applet which implements a MDI (Multiple Document Interface) using the jdk 1.2 (with respective swing components from the javax.swing.* package).  The MDI consists of a JFrame which contains a JDesktopPane.   JInternalFrames are created and then added to the JDesktopPane (via a separate Thread) using the method call:

jDesktopPaneObject.add(jInternalFrameObject).

The JInternalFrames appear on the JDesktopPane OK, however their GUI performance is terrible.  Repositioning (draging and droping) or resizing the window is excrusiatingly slow (about 20x slower than using simple JFrames).  

Does anyone know how I could improve the GUI performance of my MDI so that my
JInternalFrames respond about as well as if I used JFrames?

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Question by:CatDevlp00
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Expert Comment

by:Sasha_Mapa
ID: 6268106
A. DON'T use 1.2 - use either 1.1 (this is preferable, if you can) or 1.3
B. Try myDesktopPane.putClientProperty("JDesktopPane.dragMode", "outline") or myDesktopPane.putClientProperty("JDesktopPane.dragMode", "faster")


Sasha Maryanovsky.
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by:CatDevlp00
ID: 6270120
Thanks for the help Sasha

However I don't have a choice for the jdk version, I must use 1.2.

The call myDesktopPane.putClientProperty ("JDesktopPane.dragMode", "outline") improves the performance to an acceptable level.  However, if I can, I would like to drag and drop the entire JInternal frame and not just the outline.  The other method
myDesktopPane.putClientProperty("JDesktopPane.dragMode", "fastest") doesn't improve the performance.  Do have any other ideas on how to improve performance dragging and dropping JInternalFrames?

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Sasha_Mapa earned 300 total points
ID: 6272180
>The other method myDesktopPane.putClientProperty("JDesktopPane.dragMode", "fastest") doesn't improve the performance.

It's not "fastest", it's "faster" - it should improve performance of dragging significantly.

Sasha Maryanovsky.
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Author Comment

by:CatDevlp00
ID: 6273604
Thanks for the help Sasha, I must have been starring at my screen too long yesterday.
I tried "faster" which did improve the drop and drag performance of the JInternalFrames.
However, performance still suffers if the user opens more than 3 JInternal Frames at once.

I'm going to use "outline" instead, which will be acceptable.  Thanks for your help.  
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