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https://issues.apache.org/jira/browse/ISIS-1740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16326211#comment-16326211
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ASF subversion and git services commented on ISIS-1740:
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Commit eea0384d9be75a037a2e0d189fccc7f9af4b702b in isis's branch
refs/heads/ISIS-1740-where-am-i from [~hobrom]
[ https://gitbox.apache.org/repos/asf?p=isis.git;h=eea0384 ]
ISIS-1740 Refactoring and consolidating invocation exception handling
+ introducing MethodHandles to speed up reflective invocation
> New Feature: Where am I
> -----------------------
>
> Key: ISIS-1740
> URL: https://issues.apache.org/jira/browse/ISIS-1740
> Project: Isis
> Issue Type: New Feature
> Components: Core
> Reporter: Andi Huber
> Assignee: Andi Huber
> Priority: Major
> Fix For: 2.0.0-M1
>
> Attachments: Clipboard01.png, Clipboard02.png, Clipboard03.png,
> Clipboard04.png
>
>
> Its common practice to display a navigation hint somewhere at top of an
> application's page or below the main menu, indicating where the user
> currently has navigated to. (Typically within a navigable tree-structure.)
> Let's call this the *WhereAmI hint*. We could integrate such a feature into
> ISIS.
> +Examples+
> [^Clipboard01.png]
> [^Clipboard02.png]
> [^Clipboard03.png]
> Note: we could optionally include the DomainObject's icons
> +Proposal+
> For any DomainObject/View currently displayed ISIS would need to know its
> corresponding
> navigable tree-structure. Let's call this the DomainObject's *WhereAmI tree*.
> All the framework needs to known to build the relevant sub-tree, is to know
> the parent node of any DomainObject/View that 'takes part' in the tree.
> We could provide this 'who is your parent' meta information similar to the
> existing 'what is your title' mechanism:
> {code:java}
> // Who is your parent? if null there is none
> public AnyDomainObjectOrView parent()
> {
> return foo;
> }
> {code}
> or
> {code:java}
> // Who is your parent? if null there is none
> @Parent
> public AnyDomainObjectOrView anyMethodName()
> {
> return foo;
> }
> {code}
> The typical layout.xml could look like this:
> {code:xml}
> <bs3:grid >
> <bs3:row>
> <bs3:col span="12" unreferencedActions="true">
> <cpt:whereAmI />
> <cpt:domainObject />
> ...
> </bs3:col>
> </bs3:row>
> ...
> </bs3:grid >
> {code}
> +Implementation Notes+
> # The framework needs to ensure that the chain of parent references starting
> at the current DomainObject/View is finite. (No circular or self references.)
> If it detects a circle, be nice and just stop the 'tree-up' traversal there.
> # For standalone Collection Views we could display a WhereAmI hint that
> allows back navigation to the DomainObject/View that had produced the
> collection.
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