I'm not sure the use case is common or consistent enough.
Too often I have two panels with two separate model objects that are both
backed by the same actual underlying object, so the code I wrote below will
fail anyway.
I actually think using a marker interface on Components might be more
reliable and effective, though less generic.
(Or the more drawn out listener pattern. Or using equals and overriding it
to report whether to models are backed by the same object. Or a marker
interface on your models that can report that.... etc.)
-Jason
Matej Knopp-2 wrote:
>
> TBH I don't see this as a very common usecase. And it's not difficult
> to implement on your own (although the code isn't entirely trivial).
>
> -Matej
>
> On 6/5/07, Eelco Hillenius <[EMAIL PROTECTED]> wrote:
>> That looks like a lot of work actually. Johan, others, you think we
>> should build in better support for this in Wicket?
>>
>> Eelco
>>
>> On 6/5/07, dukejansen <[EMAIL PROTECTED]> wrote:
>> > I've gone ahead and implemented this, but instead of using the
>> > Component.saveInnermostModel method, I coded up my own. The
>> implementation
>> > in Component only traverses IWrapModel implementations, not
>> IChainedModel
>> > implementations. My implementation handles both. Note that this will
>> only
>> > find components backed by the exact same IModel instance. Two distinct
>> model
>> > objects wrapping the exact same object will not match. /**
>> > * Searches the component tree and finds any components backed by the
>> same
>> > model as the model passed in, then
>> > * adds those components to the given AjaxRequestTarget to be rendered
>> > (after first verifying that they have
>> > * outputMarkupId set to true).
>> > *
>> > * @param root the root MarkupContainer whose descendents will be
>> examined
>> > for matching backing models
>> > * @param target the AjaxRequestTarget to add all the matching
>> components to
>> > * @param model the model to match
>> > */
>> > public static void
>> > addComponentsBackedBySameModel(MarkupContainer root, final
>> > AjaxRequestTarget target, final IModel model) {
>> >
>> > // Visit all children, looking for components backed by the same
>> model.
>> > root.visitChildren(new IVisitor() {
>> > public Object component(Component component) {
>> > if (WicketUtils.isSameInnermostModel(component.getModel(),
>> > model)) {
>> > if (component.getOutputMarkupId()) {
>> > // Refresh the component.
>> > target.addComponent(component);
>> > // No need to go deeper if we're already refreshing the entire
>> component!
>> > return IVisitor.CONTINUE_TRAVERSAL_BUT_DONT_GO_DEEPER;
>> > }
>> > }
>> > return IVisitor.CONTINUE_TRAVERSAL;
>> > }
>> > });
>> >
>> > // TODO: Return the list of components that were re-rendered?
>> > // See also:
>> > //
>> >
>> http://www.nabble.com/Best-Practices-for-accessing-repainting-sibling-cousin-components--tf3841514.html
>> >
>> > }
>> >
>> > /**
>> > * Returns true if the given models ultimately share the same innermost
>> > model;
>> > * otherwise returns false.
>> > *
>> > * @param model1 the first model
>> > * @param model2 the second model
>> > * @return true if they share the same innermost model; otherwise
>> > * false
>> > */
>> > public static boolean isSameInnermostModel(IModel model1, IModel
>> model2) {
>> > // There is a version of this on Component, but it is only aware of
>> > IWrapModel.
>> > // Our version knows how to traverse chained models as well as warpped
>> > models.
>> > if (model1 != null && model2 != null) {
>> > return getInnermostModel(model1) == getInnermostModel(model2);
>> > } else {
>> > return false;
>> > }
>> > }
>> >
>> > /**
>> > * Returns the innermost model within the given model; similar to
>> > Component.getInnermostModel,
>> > * except that it follows both IWrapModel and IChainingModel, not just
>> the
>> > former.
>> > *
>> > * @param model the model
>> > * @return the innermost model within that model
>> > */
>> > public static IModel getInnermostModel(IModel model) {
>> >
>> > // Pass through nulls.
>> > if (model == null) {
>> > return null;
>> > }
>> >
>> > // Try to figure out an inner model.
>> > IModel innerModel = null;
>> > if (model instanceof IWrapModel) {
>> > innerModel =
>> > getInnermostModel(((IWrapModel)model).getWrappedModel());
>> > } else if (model instanceof IChainingModel) {
>> > innerModel =
>> > getInnermostModel(((IChainingModel)model).getChainedModel());
>> > }
>> >
>> > if (innerModel != null) {
>> > // If we got an inner model, return it.
>> > return innerModel;
>> > } else {
>> > // Otherwise the given model was the innermost, so return it.
>> > return model;
>> > }
>> >
>> > }
>> >
>> > /**
>> > * Returns the root ancestor of this component by walking up the parent
>> tree
>> > until a component is found with no parent;
>> > * note that this could return the same component passed in.
>> > *
>> > * @param component the component whose root ancestor should be
>> returned;
>> > must be non-null
>> > * @return the root ancestor
>> > */
>> > public static Component getRootAncestor(Component component) {
>> > ExceptionUtils.throwIfNull(component, "component");
>> > Component cur = component;
>> > while (cur.getParent() != null) {
>> > cur = cur.getParent();
>> > }
>> > return cur;
>> > }
>>
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