這是高通BMP平臺上的MVC設計模式，這個框架的核心就是以數據來驅動界面，對於做UI的朋友們來說，很有借鑑意義。
Design Patterns
- BUIW is built using common software engineering design patterns.
- Model-View-Controller (MVC) pattern is important to understand.
- Other patterns used in BUIW are decorator and observer patterns.
Containers
- A container is a collection of widgets, decorators and further sub-containers.
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Containers keep track of relative order of widgets, their position and layout.
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A container will handle clipping as required.
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The top level container is called the root container.
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Lots of different types of containers – CardContainer, GridContainer, ConstraintContainer, PropContainer, XYContainer.
Models
- The data that drives a widget is stored within a model
- The following models are available
- IValueModel: A model for data that can be represented in an arbitrarily complex form
- IListModel: A base class for IArrayModel and IVectorModel
- IArrayModel: A model for a collection of objects of equal fixed size
- IVectorModel: A model for a collection of objects that might be of a variable size
- IFrameModel: Base class for IMediaFrameModel and ICameraFrameModel
- IMediaFrameModel: Provides image frames from a video
- ICameraFrameModel: Provides image frames from a camera
- IInterfaceModel: Provides a model interface for objects that model their data in an interface that does not have a query interface, for example, bitmap and image widgets
- ITextModel: Model for text strings such as in text entry
- IMenuModel: Derived from IListModel
Widget View
- Responsible for rendering the model‟s data to the display
- Listens for model notifications
- Sends invalidation request to parent container, so only redraws when directed
- By letting root container redraw multiple requests can be grouped together
- The size of the content area of the view is known as the extent
- Be sure to set the extent
- The full extent of widget doesn‟t have to be redrawn when the widget is invalidated