My App in Java 1.5 has a DefaultStyledDocument in a JScrollPane.
I keep adding more text to the Document and removing them when the
Document.length() > 20000.
(And by the way, if you ever do this, the Document saves all the deleted
stuff unless you override methods in GapContent, which I do-- otherwise
you eventually run out of memory.)
But I would like always to set the scroll bar to the bottom of the
Document after entering text. I do this using:
private void updateLength() {
try {
int docLength = doc.getLength();
if (docLength > 20000) {
doc.remove(0, docLength - 20000);
}
// Set the cursor and text to the bottom
docLength = doc.getLength();
ep.setCaretPosition(docLength);
int docPosition = doc.getEndPosition().getOffset();
if(docPosition != docLength + 1) {
System.err.println("Length=" + docLength
+ " Caret Position=" + ep.getCaretPosition()
+ " Document Position=" +
doc.getEndPosition().getOffset());
}
// For some reason this kills the Document.
// Check that the user is not scrolling
if(!(jsb.getModel().getValueIsAdjusting())) {
int visibleAmount = jsb.getVisibleAmount();
int maxSB = jsb.getMaximum();
jsb.setValue(maxSB - visibleAmount);
}
}
catch (BadLocationException ex) {
Logger.getLogger(MyTrapReceiver.class.getName()).log(Level.SEVERE, null,
ex);
}
}
This always eventually screws up my document and I get out of bounds
errors and also things like
Exception in thread "AWT-EventQueue-0"
java.lang.ArrayIndexOutOfBoundsException
at java.lang.System.arraycopy(Native Method)
at javax.swing.text.BoxView.updateLayoutArray(BoxView.java:197)
at javax.swing.text.BoxView.replace(BoxView.java:173)
at javax.swing.text.View.append(View.java:432)
at javax.swing.text.FlowView$FlowStrategy.layout(FlowView.java:412)
at javax.swing.text.FlowView.layout(FlowView.java:184)
at javax.swing.text.BoxView.setSize(BoxView.java:379)
at javax.swing.text.BoxView.updateChildSizes(BoxView.java:348)
at javax.swing.text.BoxView.setSpanOnAxis(BoxView.java:330)
at javax.swing.text.BoxView.layout(BoxView.java:682)
at javax.swing.text.BoxView.setSize(BoxView.java:379)
at
javax.swing.plaf.basic.BasicTextUI$RootView.setSize(BasicTextUI.java:1619)
at
javax.swing.plaf.basic.BasicTextUI.getPreferredSize(BasicTextUI.java:813)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1624)
at javax.swing.JEditorPane.getPreferredSize(JEditorPane.java:1227)
at
javax.swing.ScrollPaneLayout.layoutContainer(ScrollPaneLayout.java:769)
at java.awt.Container.layout(Container.java:1401)
at java.awt.Container.doLayout(Container.java:1390)
It works if I leave out the jsb.setValue chunk of code. What am I doing
wrong?
Jim Rome
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