DDI HAVi Declarative UI Model

1
DDI - HAVi Declarative UI Model

• UI for an application or a DCM on any HAVi
  controller with a display
• user can interact with a HAVi system from any
  device in the network
• Declarative Data Driven Interaction (DDI)
• simple interpreter
• Widget-Based
• buttons, sliders, selections,
• optional sound and image attributes
• mandatory text attribute to support text-only
  displays

2
DDI Controller-Target Split

• DDI Target (e.g., DCM) is in charge of the device
• much UI information supplied to Controller is
  advisory
• DDI Controller is in charge of the screen
• has no semantic knowledge of the particular
  device

3
DDI Example Simple VCR UI
Ill be getting an example bitmap from Pierre
without the Evaluation Copy
4
DDI Example More Elaborate VCR Help System UI
Ill be getting another example bitmap from Pierre
5
DDI Controller-Target Split

• DDI Target (DCM) is in charge of the device
• DDI Controller does not know the specific device
  functionality behind the UI elements
• limited but mandatory set of HAVi device control
  (DCM) APIs
• DDI allows control by a user of non-standardized
  device specific features

6
DDI Controller-Target Split

• DDI Controller is in charge of the screen
• Controller is generic with respect to devices
• geometric layout, navigation, and look-and-feel
• target makes suggestions via element attributes
• target does not need to deal with display
  capabilities of DDI controller

7
DDI Operation

DCM Host Device
DDI Target (a DCM)
Controlled Device
Controlling Device
F/IAV
F/IAV
BAV
Local Display and other I/O
SDD
DDI Controller (Application)
SDD DCM FCM DDI? DCA?
DCM
HAVi Msg System
HAVi Msg System
DDI protocol (HAVI Messages)
DCM sends proprietary commands
DCM reads DDI data
8
DDI - HAVi Declarative UI Model

• More detail coming in Section 2