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Collapse All Rows in TreeLayer [message #1133107]

Fri, 11 October 2013 16:08

$Evan O\'Connell is currently offline$ Evan O\'Connell

Messages: 14
Registered: August 2013

Junior Member

I need to add Expand All and Collapse All functionality to the TreeLayer.

I have tried the following code to Collapse All rows in the TreeLayer. It only works when all nodes are expanded, otherwise it throws a NullPointerException.

int parentIndex = 0;
ITreeRowModel treeModel = treeLayer.getModel();
List<Integer> childIndexes = treeModel.getChildIndexes(parentIndex);
Collections.reverse(childIndexes);
childIndexes.add(parentIndex);

System.out.println(childIndexes);

for (Integer index : childIndexes) {
	if (treeModel.isCollapsed(index) == false) {
		treeLayer.collapseTreeRow(index);
	}
}

If I have the following tree structure:

-[-] A
  |
  +--[-] B
  |   |
  |   +-- z
  |
  +--[-] C
  |   |
  |   +-- y
  |

Running my collapse all code will successfully collapse A,B,C. But if I were to expand all of them and manually collapse C, then running the code will throw a NullPointerException on the following method:

treeModel.getChildIndexes(parentIndex);

ie:

-[-] A
  |
  +--[-] B
  |   |
  |   +-- z
  |
  +--[+] C
  |

Stack Trace:

java.lang.NullPointerException
	at ca.odell.glazedlists.impl.adt.barcode2.FourColorTree.get(FourColorTree.java:169)
	at ca.odell.glazedlists.TreeList.getTreeNode(TreeList.java:302)
	at org.eclipse.nebula.widgets.nattable.extension.glazedlists.tree.GlazedListTreeData.getChildren(GlazedListTreeData.java:76)
	at org.eclipse.nebula.widgets.nattable.extension.glazedlists.tree.GlazedListTreeRowModel.getChildIndexes(GlazedListTreeRowModel.java:89)
	at org.eclipse.nebula.widgets.nattable.extension.glazedlists.tree.GlazedListTreeRowModel.getChildIndexes(GlazedListTreeRowModel.java:93)
	at org.eclipse.nebula.widgets.nattable.extension.glazedlists.tree.GlazedListTreeRowModel.getChildIndexes(GlazedListTreeRowModel.java:93)

Any ideas?

[Updated on: Mon, 14 October 2013 11:32]

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Re: Collapse All Rows in TreeLayer [message #1133302 is a reply to message #1133107]

Fri, 11 October 2013 19:27

Dirk Fauth

Messages: 2902
Registered: July 2012

Senior Member

I'm not really sure, but maybe it is a race condition. Maybe it is necessary to lock the list prior collapsing.

At least in GlazedListTreeData there needs to be a null check.

Could you please file a ticket in bugzilla? This needs to be investigated in more detail. It would be great if you could provide a small running example with the ticket so it is easier for us to start the investigation.

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Re: Collapse All Rows in TreeLayer [message #1137450 is a reply to message #1133302]

Mon, 14 October 2013 13:59

$Evan O\'Connell is currently offline$ Evan O\'Connell

Messages: 14
Registered: August 2013

Junior Member

Done. Bug 419366

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Re: Collapse All Rows in TreeLayer [message #1220150 is a reply to message #1133302]

Tue, 10 December 2013 06:45

P P

Messages: 6
Registered: December 2013

Junior Member

Hi Dirk,
I checked on the Bug 419366 in Bugzilla and that it is fixed. I wanted to check when this would be available i.e. the next targeted release for NatTable?

Thanks,
Prerna

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