Thread: JSplitPane divider location always resets to its initial value

Hi.

I have a JSplitPane in my GUI. Both the left and the right components of this split pane are JScrollPane's.
The left scroll pane contains a JTree with several items.

The problem I am having is, that when the user moves the divider location of the split pane, and then selects an item from the JTree on the left, the divider location jumps back into its initial value.
Annoyed by this behavior I tried to hack it for now with the following code:

		splitPane.addPropertyChangeListener(JSplitPane.DIVIDER_LOCATION_PROPERTY, new PropertyChangeListener() {
			public void propertyChange(PropertyChangeEvent e) {
				scrollPane.setPreferredSize(new Dimension(splitPane.getDividerLocation() - 1, MIN_HEIGHT));
			}
		});

But this hack does not work either. Sometimes it works, but other times when I select an Item the divider location jumps back to the initial value again.
I am probably overlooking some obvious setting here, but for the love of god I can not find the problem at the moment.

Thank you all very much.

Something in your design is ignoring the user's input by resetting the split pane's divider to its original position. Modify your code to preserve the user's input. Review the JSplitPane tutorial and/or post code that demonstrates the problem.

I think I know now what was the cause of this.
When certain items within the JTree are selected the rightComponent of the SplitPane is changed. And with changed I mean setRightComponent is being called on the SplitPane.
So my guess is that this would reset the divider location.

The solution was simple, before changing the right component I get the old divider location and then set the divider location to its previous value after changing the right component.

Congrats! There may be a field to be set that would change the divider's default location.