3.2.3 Type Browser
also Section 3.2.1 for features common
to all browsers|
The Type Browser
allows you to view and open editors on the elements of metamodels, including
graph, object, relationship and role types. You can view design elements of
these types by project, and open editors on the design elements. In addition,
you can open, close and create projects. Thus, the Type Browser is used both for
working with graph types, and for working with graphs and their elements, in the
case that the user knows the type of the element.
You can access a Type Browser either by activating the
‘Type Browser’ notebook page in the Main Launcher, or alternatively
open a new instance of it in its own window by selecting Browsers | Type
. Figure 3–27
Type Browser window.
Figure 3–27. Type Browser.
The list in the middle
shows all the available graph types of that kind. You may determine which kinds
of types (graph, object, relationship, role or property types) are visible in
the middle list from the pull-down list labeled Show
. By default all the
graph types are shown, as in Figure
that the type list is not restricted by the project selections in the left-hand
list: all loaded types are
Selecting a type in the middle
list fills the right-hand list with all the currently loaded instances of that
type that are in the selected projects. The contents of the instances list on
the right thus change according to the selections made in the other two lists.
For example, in Figure 3–27
user is browsing all ‘WatchApplication’ graphs in the ‘Digital
there are no projects selected, no instances will be visible in the instance
list when you choose a
Load More Repository
In general, browsing design data by type will only show data
that has already been read from the repository (all graphs in a project and
their immediately contained objects, roles and relationships are read
automatically when the project is opened). Because MetaEdit+ intelligently loads
information from the repository only as it is accessed, and flushes little-used
objects when memory is low to improve performance, some objects may not be found
when accessed by their type. Especially at the start of a session, searches by
type on data other than graphs are likely to miss many objects, as they have not
yet been loaded.
Load More Repository
you to load more of the repository contents, and can be used if you think there
should be an instance available but MetaEdit+ does not list it. Another way is
to access the object by following links from objects already loaded, e.g.
opening graphs or property dialogs.
The kind of types shown in the middle list can be selected
through the Show pull-down list: selecting Graphs shows all graph types
in the list, Objects all object types, Relationships all relationship types,
Roles all role types and Properties all property types respectively. The types
in the list are organized in a tree view according to their inheritance
The pop-up menu for the types list, as in Figure 3–28
, allows you to create a
graph, view or edit a type, get information about it, reversibly remove types,
and salvage removed types.
Figure 3–28. Menu for managing types.
all graph types have a pop-up menu item for creating a new graph of that type.
To create a graph in the Type Browser:
sure you have the desired Default project
‘Graphs’ from the Show pull-down list (if not already
a graph type (e.g. WatchApplication) with the left mouse
the pop-up menu with the right mouse
Create Graph... from the
A property dialog appears asking
information about the graph to be created. After entering information and
pressing OK a new graph with the given properties appears in the list on
graph will not be shown if the default project is not selected in the projects
list, or if the instances list has a filter that does not match the
new graph to edit it in an editor.
Managing graphs and other instances
The list of the instances on the right also has a pop-up menu.
For the graph instances, i.e. when Graphs is selected from the Show
pull-down list, the menu is similar to that in the Graph list in Graph Browser
(see Figure 3–25
description of the menu there). For objects, roles and relationships the menu is
similar to that of elements list in Graph Browser (see Figure 3–26
and the description of
the menu there), with the exception of the Replace Tool that is not available in
the Type Browser.