Presenty is a platform-independent user interface application framework. It uses a modified Model-View-Presenter pattern with continuation-based tasks to represent user interactions. Tasks are composed of primitive and compound user requests to interface components. An extendable domain-specific language in Smalltalk allows for implementing reusable tasks. The framework supports contact management tasks like selecting contacts from groups or search, implemented using this task-based approach.

1. Presenty
User Interface Framework
http://www.squeaksource.com/Presenty MIT license

2. Presenty
Platform-independent user interface
application

3. Desktop contact manager

4. Filter contacts by typed name

5. Select contact from groups

6. Select contact from last calls

7. Contact selection show details data

8. Presenty approach
● Multiple separated tasks a user can perform
● Each task is a sequence of user requests
● Contact groups selection task:
1) select group from groups list
2) select contact from selected group contents
3) look at selected contact details

9. Implementation
● Continuation-based tasks as elements of user
interaction at application level
● User requests as building blocks for tasks:
● Primitive user requests to invoke base interface
components
● Compound requests for calling other tasks
● Extendable DSL (pure Smalltalk) facilitating
task implementation
● Modified Model-View-Presenter pattern

10. SelectContactFromGroupsTask
body
| selected group |
group := user select: ContactsGroup from: ContactManager groups.
selected := user select: Contact from: group contents.
user goTo: (DetailedContactPresenter on: selected )

11. Select contact from groups

12. SelectContactBySearchTask
body
| selected |
selected := user execute: (
PtySearchItemTask forItems: ContactManager contacts ofClass: Contact).
guide restoreActiveArea.
user goTo: (DetailedContactPresenter on: selected )

13. SelectContactFromLastCallsTask
body
| selected |
selected := user select: 'LastContact' from: ContactManager lastCalls.
user goTo: (DetailedContactPresenter on: selected )

14. ShowContactsForDesktopTask
body
guide viewport createNewViewArea.
guide forkTask: SelectContactFromLastCallsTask new.
guide forkTask: SelectContactFromGroupsTask new.
guide forkTask: SelectContactBySearchTask new.
user goTo: [guide showViewArea]

15. Select contact from last calls

16. Select contact from last calls

17. Select contact from groups

18. Select contact from groups

19. Filter contacts by typed name

20. guide translator

21. Filter contacts by typed name

22. Filter contacts by typed name

23. ShowContactsForPhoneTask
body
| taskClass |
guide viewport createNewViewArea.
taskClass := user select: 'ContactManagerTask' from:
{SelectContactFromLastCallsTask. SelectContactFromGroupsTask.
SelectContactBySearchTask}.
guide addBackButton.
user execute: taskClass new

24. Task Configuration
● Presenter can have different views in different
contexts
● For different parent presenters
● For different tasks
● For different styles of presenter
● For different styles of parent presenter

25. Task Configuration
● Guide can store default settings for tasks
– guide create: PtyShowListTask
● Task settings can vary in different contexts

26. How tasks configured
● PtyItemsListTask has itemPresenterFactory
which can be saved in settings
● PtyExplicitPresenterFactory specifyed concrete
presenter class to present list items
● PtyPresenterPreviewFactory use
#preferredPreviewPresenter message for getting
presenter from list item

27. What should be done
● Configurable task activation
● Simple object editor task
– user edit: object
● Better designer
● Serializing prototypes and settings to style
classes
● Searching for prototypes and settings in
multiple task contexts
● Documentation

28. Questions?

29. The end

30. Modal warning example

31. Tasks from blocks
DetailedContactPresenter>>runCall
guide executeTask: [
guide doInModal: [
guide user warn: 'You dial to ', model printString].
guide user stopCurrentTask.
] asTask

32. Presenty UI framework
● Modified Model-View-Presenter pattern
● Continuation-based tasks as elements of user
interaction at application level
● User requests as building blocks for tasks:
● Primitive user requests to invoke base interface
components
● Compound requests for calling other tasks
● Extendable DSL (pure Smalltalk) facilitating
task implementation
● Prototyping for visual components and tasks

33. Modified Model-View-Presenter
pattern