Editing the Target of a Hyper-Reference

Dynamic View Services > Specifying Dynamic View Types > Hyper-References > Editing the Target of a Hyper-Reference

The semantics used for editing the target of hyper-references is very similar to that used for editing references (see Editing a Reference). In particular, a hyper-reference attribute is not editable unless it is mapped to a runtime server relation path in which the last relation declares a modifier.

In the previous examples, the linkName hyper-references are not editable because they are mapped to the relation this, which has no modifier.

On the contrary, the title hyper-reference is editable because it is mapped to the inverted relation company, whose direct relation Company::departments is editable.

Let us consider now a ProjectTable view type which lists the properties of the contributions to a project in a TableR:

view ProjectTable:

subscribe origin Project:

represent TableR table:

....

propagate contributions

subscribe Contribution:

represent RowR row:

...

HyperRef column[1]={employee->EmployeeDataSheet,employee.name};

The hyper-reference attribute column[1] is mapped to the direct relation employee which has a modifier. Therefore, it can be edited.

Just as for references, editing the target of a hyper-reference means modifying the target of the corresponding relation path (see Editing a Reference).

To nullify the target, use the following callback function:

IlsRpObject::onNullifyRef(IlsRpAttributelId);

To replace the target, use the following function:

virtual IlsBoolean onUpdate(IlsRpAttributeId editedHyperRef,

const IlsRpObject& targetOwner,

IlsRpAttributeId targetHyperRef);

An employee contributing to a project can be replaced through reference editing or through hyper-reference editing with the same result.

Let us assume that the table gadget allows to drag and drop the row hyper-references, both within a table and between two different tables. Let us also assume that this operation executes the RowR callback function onHrefDragDrop on the destination row, taking as parameters:

the column index of the destination row;

the origin row;

the column index of the origin row.

Here is the body of this callback:

RowR::onHRefDragDrop(int destColumn,

RowR& originRow,

int origColumn)

{

onUpdate(getAttributeId("row",destColumn),

originRow,

getAttributeId("row",origColumn));

}

On the server side, the relation to be edited is determined first. In other words, the employee contributing to the project is represented by the destination row. This relation is assigned a new target object. This means that the employee contributing to the project is represented by the origin row.

The function IlsRpObject::isMatchingHRef checks whether a hyper-reference can be used to update another hyper-reference.

Note: The onUpdate function used above can also be used to edit references when the new target is identified by a hyper-reference. Conversely, the onUpdate function that takes a representation object as a parameter (used in this code sample) can also be used to edit hyper-references.

Version 6.3