Refresh content of an expanded ListGrid record

[edgraaff]

In a situation where I have a ListGrid with getExpansionComponent overridden, I would like to refresh the content of the expanded component. I figured that I can refresh a row of a ListGrid using refreshRow, but the grid probably know if it's necessary to update the expanded component as there isn't directly a field related to that. Collapsing the record and expanding it again redraws it ofcourse.

Take this example:

addChild(grid = new ListGrid() {
	@Override
	protected Canvas getExpansionComponent(ListGridRecord record) {
		/*
		 * This is just an example of what the expanded content could be
		 */
		Canvas c = new Canvas();
		c.setContents(record.getAttribute("expandedContent"));
		c.setHeight(20);
		c.setWidth100();
		return c;
	}

	{
		setWidth100();
		setHeight100();
		setCanExpandRecords(true);

		setFields(
			new ListGridField("id"),
			new ListGridField("name")
		);

		/*
		 * Add some random data
		 */
		setData(new ListGridRecord[]{
			new ListGridRecord() {{
				setAttribute("id", "1");
				setAttribute("name", "Row one");
				setAttribute("expandedContent", "This content is for the expanded component of row one");
			}},
			new ListGridRecord() {{
				setAttribute("id", "2");
				setAttribute("name", "Row two");
				setAttribute("expandedContent", "This content is for the expanded component of row two");
			}}
		});
	}
});

/*
 * After 2 seconds, we'll update some data
 */
(new Timer() {
	@Override
	public void run() {
		Record r = grid.getRecord(0);
		r.setAttribute("name", "New name for row one");
		r.setAttribute("expandedContent", "New content is for the expanded component of row one");
		grid.refreshRow(0);
	}
}).schedule(2000);

This renders a grid which is expandable, don't mind the content of the expansion component for now :). But as you can see, in a Timer the content is updated which is used in the expanded component - and should also be refreshed.

Is there a way to redraw the expanded component of a record? I'm using SmartGWT 2.4, which contains SmartClient 8.0 2010-12-31.

Thanks in advance for your help!!

[davidj6]

Currently you have to call collapseRecord and then expandRecord to force a new call to getExpansionComponent.

[edgraaff]

Thanks, that works. I also figured that you can use getExpansionComponent to set the ID of the expansion component on the record:

record.setAttribute("_expansionComponentID", expansionComponent.getID());

and later use:

String expansionComponentID = record.getAttribute("_expansionComponentID");
if (expansionComponentID != null) {
	Canvas expansionComponent = Canvas.getById(expansionComponentID);
	if (expansionComponent instanceof (whatever you're expecting)) {
		// ... do stuff to refresh it
	}
}