Palm WebOS Overview

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This is a lightning presentation given by Gorkey Vemulapalli to our team introducing the basics of Palm's new WebOS platform being used on the Palm Pre device.

This is a lightning presentation given by Gorkey Vemulapalli to our team introducing the basics of Palm's new WebOS platform being used on the Palm Pre device.

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Transcript

  • 1. Palm WebOS An Introduction Gorkey Vemulapalli
  • 2. What is WebOS?
    • Palm's next generation operating system
    • Designed around an incredibly fast and beautiful user experience and optimized for the multi-tasking user
    • Integrates the power of a window-based operating system with the simplicity of a browser
  • 3. What is WebOS?
    • Embedded Linux operating system that hosts a custom User Interface (UI) System Manager built on standard browser technology
    • System Manager provides a full range of system user interface features
    • Navigation, application launching and lifecycle management, event management and notifications
    • System status, local and web searches, and rendering application HTML/CSS/JavaScript code
  • 4. Application Development
    • Applications are built using standard web technologies and languages
    • Have access to device-based services and data
    • Think of webOS applications as native applications, but built from the same standard HTML, CSS and JavaScript
  • 5. Application Development (contd..)
    • Standard web development environment extended through a JavaScript framework
    • Gives standardized UI widgets, and access to selected device hardware and services
    • The user experience is optimized for launching and managing multiple applications at once.
  • 6. Application Development (Contd..)
    • WebOS is designed around multi-tasking
    • Utterly simple to run background applications, to switch between applications in a single step, and to easily handle interruptions and events without losing context
    • Build with typical design and implementation practices for Ajax applications
  • 7. Application Model Native and Web Application Models
  • 8. Application Model (Contd..)
    • WebOS follows the mix of classic and Ajax Web Application models.
    • Applications can run in the background, managing data, events and services behind the scenes while engaging the user when needed
    • Create and manage your own persistent data using HTML5 storage functions
  • 9. User Interface (Overview)
    • Designed for mobile, battery-operated devices with limited though variable screen sizes, and a touch-driven user interface
    • Rich notification system to subtly inform or directly engage the user
  • 10. User Interface (Navigation)
    • Navigation is based upon a few simple gestures with optional extensions
    • tap (act on the indicated object). Like open function
    • back (the inverse of open) . reverses a view transition, as going from a child view to a parent view.
    • scroll - flick and quick drags are used to scroll through lists and other views
    • In addition you can use pan, zoom, drag & drop, switch applications, switch views, search, filter lists and launch applications
  • 11. User Interface (Card View)
  • 12. User Interface (Activity)
    • You work on one activity at a time within multiple applications
    • Eg. draft email has its own card separate from the email inbox card
    • You can have as many draft emails, each in their own card, as you need; each is considered a separate activity and independently accessible
  • 13. User Interface (Notifications and Dashboard) Banner Notification Notification Icons Dashboard
  • 14. Mojo Application Framework
    • A webOS application is similar to a web application based on standard HTML, CSS, and JavaScript, but the application lifecycle is different.
    • The webOS APIs are delivered as a JavaScript framework, called Mojo
    • To build full-featured webOS applications, many developers will also leverage HTML5 features such as video/audio tagging and database functions
    • Prototype JavaScript framework is bundled with Mojo to assist with registering for events and DOM handling
  • 15. Mojo Application Framework
    • Application structure , such as controllers, views, models, events, storage, notifications, logging and asserts
    • UI widgets , including simple single-function widgets, complex multi-function widgets and integrated media viewers
    • Services , including access to application data and cross-app launching, storage services, location services, cloud services, and accelerometer data
  • 16. Anatomy of a webOS Application
  • 17. Application Lifecycle
    • Single scene apps, such as a Calculator, which the user can launch, interact with and then set aside or close
    • Headless apps, such as traffic alert application that only prompts with notifications
    • Connected apps like a social-networking app, which provides a card for interactionor viewing and a dashboard giving status
    • Complex multi-stage apps like Email, which can have an Inbox card, one or more compose cards, along with a dashboard showing email status
  • 18. Events
    • Palm webOS supports the standard DOM Level 2 event model
    • UI Widgets have a number of custom events
    • webOS Service functions work a bit differently, with registered callbacks instead of DOM-style events
  • 19. Storage & Services
    • Supports the HTML5 database functions directly and provides high-level functions to support simple (CRUD) operations
    • Through Mojo Depot functions, you can create a local database and add, delete or retrieve records individually or as a set
    • A service is an on-device server for any resource, data, or configuration that is exposed through the framework for use within an application
    • Services are called through a single controller function, serviceRequest request passes a JSON object specific to the called service and specifying callbacks for success and failure of the service request.
  • 20. Palm webOS Architecture
    • Based on the Linux 2.6 kernel, with a combination of open source and Palm components providing user space services, referred to as the Core OS
    • You won't have any direct interaction with the Core OS, nor will the end users
    • Access is through Mojo and the various services
  • 21. Application Environment
  • 22. The End 5 minutes of question time starts now!
  • 23. Questions 4 minutes left!
  • 24. Questions 3 minutes left!
  • 25. Questions 2 minutes left!
  • 26. Questions 1 minute left!
  • 27. Questions 30 seconds left!
  • 28. Questions TIME IS UP! For more resources, visit http:// developer.palm.com /