Thanks so much for nudging me in the right direction. I rewrote that
paragraph on binding events [1] in a way I understand (see below). As I was
rewriting, I realized there is still one mystery.
When I use .bind, it appears I can only use events (changeValue) as targets:
textField.bind("changeValue", label, "value");
That works. I cannot use "value" in place of "changeValue". On the other
hand, with a controller, I use the indirect property (value), rather than an
event. "ChangeValue" won't work:
var controller = new qx.data.controller.Object(model);
controller.addTarget(textfield, "value", "controllerValue");
Is that generally the case (event for .bind/ value for controller)? Are
those the only places where there are different binding configurations?
Thanks!
========rewrite ===============
Binding an implicit property through methods and events
Some properties of objects used as models can only be accessed through a
method or an event. Those properties cannot be bound directly, but they can
be bound through a method or an event that references them. One common case
is the TextField widget, which does not have a direct "value" property,
unlike the Label of the previous example, which does have a "value"
property. The "value" of a TextField is only addressed through getter /
setter methods and change events. Indirectly therefore Textfield does indeed
have a property for binding, though it is not implemented as a direct
property. Using the changeValue event, "value" can be bound as is shown in
the example snippet. The API is essentially the same as the property binding
case.
var textField = new qx.ui.form.TextField();
var label = new qx.ui.basic.Label();
textField.bind("changeValue", label, "value");
As you can see, the same method has been used. The difference is that the
first argument is a data event name and not a property name.
In a similar fashion, a controller can bind to the implicit "value" property
of the Textfield:
var textField = new qx.ui.form.TextField();
// create the controller
var controller = new qx.data.controller.Object(model);
// connect the name
controller.addTarget(textfield, "value", "name", true);
In this case the binding code translates the "value" property into
getValue() and setValue() methods.[?? do not know when binding should be to
the implicit property and when it should be to the change event.]
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