Timeline and Dynamic Lanes

[viniciushmol]

Hi, fellas!

Is it possible to use a timeline with dynamic lanes(i.e. bringing them from a datasource)?

I really did a deep research about that and can't figure out a working solution.

I'm using SmartGWT 3.1 and trying something like below, but the lanes don't show up on the page:

public class Module implements EntryPoint {
	
	public static Lane[] lanes;
	
	/**
	 * This is the entry point method.
	 */
	public void onModuleLoad() {
		
		
		AnyDS.getInstance().fetchData(null, new DSCallback() {
			
			@Override
			public void execute(DSResponse response, Object rawData, DSRequest request) {
				
				Record[] rs = response.getData()
				lanes = new Lane[rs.length]
						
				for(int i = 0 ; i < rs.length ; i++){
					Record r  = rs[i];
					lanes[i] = new Lane(r.getAttribute("x"), r.getAttribute("y"));
				}					
			}
		});

		Timeline timeline = new Timeline();  
		timeline.setLanes(lanes);
                timeline.setDataSource(OtherDS.getInstance());
		timeline.draw();
	}
}

Thanks in advance

[viniciushmol]

No tips so far, guys?

Didn't anyone understand my question? Is it a little bit strange?

Or just a few people is really using the Timeline widget and nobody worked on something similar up to now?


Thanks again

[Isomorphic]

The Timeline is being created before the fetch returns, so there are no lanes to set - just move all of the Timeline creation code into the callback from the fetchData, right after the for loop. Note that setLanes() won't presently work *after* initial draw(). This is queued to be addressed.

[viniciushmol]

Thanks for answers, Isomorphic guys!

After some more research e brain activity :), I was getting closer to what you said.

But thinking even more about all that, I came up with the solution below:

Is this a good approach?

public class PlanilhaTimeline extends Timeline {

	private static DataSource anyDS;
	private static DataSource otherDS;
	
	public PlanilhaTimeline() {
		anyDS = AnyDS.getInstance();
		otherDS = OtherDS.getInstance();

		...
		setDataSource(anyDS);
				
		AdvancedCriteria criteria = new AdvancedCriteria(...);
		setInitialCriteria(criteria);
		
		setAutoFetchData(true);
		
	}
	
	@Override
	public void draw() {
		
		otherDS.fetchData(null, new DSCallback() {
			
			@Override
			public void execute(DSResponse response, Object rawData, DSRequest request) {

				Record[] rs = response.getData();
						
				for(int i = 0 ; i < rs.length ; i++){
					Record r  = rs[i];
					addLane(new Lane(r.getAttribute("x"),r.getAttribute("y")));
				}					
			}
		});
		
		super.draw();
	}

}

[Isomorphic]

No, not really. Adding lanes after the Timeline draws is vastly more expensive than providing all the lanes up front, before the Timeline draws.

[Isomorphic]

Just a quick note that we've fixed setLanes() being called after draw() and the fixes will hit nightly builds of 3.1p and 4.0d from February 10 (see smartclient.com/builds).

Note that it is still most efficient to setLanes() before setData() or fetchData() and draw(), but it will now work in any case.