ADF: Creating a custom train button bar, reflecting the disabled state

Requirement

In some cases there is a need to obtain more control over the ADF train button bar. The generated default does not allow to add an additional actionListener.

	<af:trainButtonBar id="pt_tbb1"
	value="#{controllerContext.currentViewPort.taskFlowContext.trainModel}"/>

view raw train-template.jspx hosted with ❤ by GitHub

Environment

JDeveloper/ADF 11.1.1.7

Solution

There is a simple solution I found on http://www.adftips.com/2010/10/adf-ui-how-to-specify-actionlistener.html to create custom buttons for the previous / next functionality.

	<af:commandButton id="back" text="Back"
	action="#{controllerContext.currentViewPort.taskFlowContext.trainModel.getPrevious}"
	actionListener="#{yourActionListener}"
	/>
	<af:commandButton id="next" text="Next"
	action="#{controllerContext.currentViewPort.taskFlowContext.trainModel.getNext}"
	actionListener="#{yourActionListener}"
	/>

view raw train-template.jpx hosted with ❤ by GitHub

But there is still one thing missing. The buttons are always enabled. Unfortunataly there is no easy way to set the disabled property right from the given trainModel that is accessible by EL.

To solve this we create a managed bean as follows:

	package enpit.sample.adf.controller;
	import oracle.adf.controller.ControllerContext;
	import oracle.adf.controller.TaskFlowContext;
	import oracle.adf.controller.TaskFlowTrainModel;
	import oracle.adf.controller.TaskFlowTrainStopModel;
	import oracle.adf.controller.ViewPortContext;
	import oracle.adfinternal.controller.train.TrainStopModel;
	public class TrainController {
	public TrainController() {
	super();
	}
	/**
	*
	* @return
	*/
	public boolean getPreviousDisabled() {
	TaskFlowTrainModel trainModel = getTrainModel();
	TaskFlowTrainStopModel currentStop = trainModel.getCurrentStop();
	TrainStopModel previoudStopModel =
	(TrainStopModel)trainModel.getPreviousStop(currentStop);
	if (previoudStopModel == null) {
	return true;
	}
	return previoudStopModel.isDisabled();
	}
	/**
	*
	* @return
	*/
	public boolean getNextDisabled() {
	TaskFlowTrainModel trainModel = getTrainModel();
	TaskFlowTrainStopModel currentStop = trainModel.getCurrentStop();
	TrainStopModel nextStopModel =
	(TrainStopModel)trainModel.getNextStop(currentStop);
	if (nextStopModel == null) {
	return true;
	}
	return nextStopModel.isDisabled();
	}
	private TaskFlowTrainModel getTrainModel() {
	ControllerContext controllerContext = ControllerContext.getInstance();
	ViewPortContext currentViewPortCtx =
	controllerContext.getCurrentViewPort();
	TaskFlowContext taskFlowCtx = currentViewPortCtx.getTaskFlowContext();
	TaskFlowTrainModel trainModel = taskFlowCtx.getTaskFlowTrainModel();
	return trainModel;
	}
	}

view raw TrainController.java hosted with ❤ by GitHub

Now it is possible to bind the properties for disabled status

	<af:commandButton id="back" text="Back"
	action="#{controllerContext.currentViewPort.taskFlowContext.trainModel.getPrevious}"
	actionListener="#{yourActionListener}"
	disabled="#{pageFlowScope.trainController.previousDisabled}"
	/>
	<af:commandButton id="next" text="Next"
	action="#{controllerContext.currentViewPort.taskFlowContext.trainModel.getNext}"
	actionListener="#{yourActionListener}"
	disabled="#{pageFlowScope.trainController.nextDisabled}"
	/>

view raw train-template.jspx hosted with ❤ by GitHub

Similiar posts

http://www.adftips.com/2010/10/adf-ui-how-to-specify-actionlistener.html