Bug 172193 [DataBinding] Binding customization story
From IM... 10:12:10 PM brad: this is sort of a short in the dark but do you get confused by the method names in BindSpec? when i look at BindSpec i always think of either target -> model or model -> target. i'm not sure if i could come up with a way that wouldn't be as confusing to me but was curious if it confuses you at all. 10:13:04 PM boris: Two BindSpec, one for each direction? 10:15:21 PM brad: not exactly. what i get confused about are methods like setTargetToModelConverter and setTargetUpdatePolicy. (this is probably silly) but when i think of any set for target i always think of going from target to model. but instead setTargetToModel goes from target to model but setTargetUpdatePolicy is for model to target. 10:15:46 PM brad: i normally think of the pipeline when setting these values, for some reason it's easier for me. 10:16:01 PM brad: if it doesn't confuse you don't worry about it, i'm not always typical 10:16:24 PM boris: Would it be easier with two constants, TARGET_TO_MODEL and MODEL_TO_TARGET, and each method taking an int? 10:16:39 PM boris: It would cut down on the number of methods... brad10:17:03 PM brad: either that or having a naming convention that's a little more consistent (setTargetToModelUpdatePolicy(...), etc.) 10:17:31 PM brad: it might get a little verbose having to specify the direction for each method... 10:17:36 PM boris: T2M and M2T? 10:17:46 PM brad: yeah
examples/org.eclipse.jface.examples.databinding/src/org/eclipse/jface/examples/databinding/snippets/Snippet011ValidateMultipleBindingsSnippet.java
* Status to return for both bindings.
			 */
			IStatus validationStatus;
			public IStatus handleBindingEvent(BindingEvent e) {
				if (!(e.copyType == BindingEvent.EVENT_COPY_TO_MODEL && e.pipelinePosition == BindingEvent.PIPELINE_AFTER_CONVERT)) {
					return Status.OK_STATUS;
				}
				Binding other = (e.binding == binding1) ? binding2 : binding1;
				if (changingValue == null) {
					changingValue = e.convertedValue;
					validationStatus = Status.OK_STATUS;
					
					
					other.updateModelFromTarget();
					
					changingValue = null;
				} else if (!changingValue.equals(e.convertedValue)) {
					validationStatus = Status.CANCEL_STATUS;
				}
				return validationStatus;
			}
		};
		binding1.addBindingEventListener(listener);
		binding2.addBindingEventListener(listener);
		
		model.value1.addValueChangeListener(new IValueChangeListener() {
			public void handleValueChange(ValueChangeEvent event) {
				System.out.println("Value 1: " + model.value1.getValue());
			}
		});