Java Land F
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Java Land F






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    Java Land F Java Land F Presentation Transcript

    • Java Look-and-Feel Design Guidelines Eileen Kraemer University of Georgia CSCI 4800/600
    • An online book …
      • The Java Look-and-Feel Design Guidelines, Second Edition are available online
      • Target audience:
        • the designer who chooses the interface elements, lays them out in a set of components, and designs the user interaction model for an application
    • Focus of the book ….
      • design guidelines for software that uses the Swing classes together with the Java look and feel.
      • on creating cross-platform GUI (graphical user interface) applications and applets in the JavaTM programming language.
      • on design issues and human-computer interaction in the context of the Java look and feel.
      • guidelines are appropriate for GUI applications and applets on PCs and network computers; doesn’t address the problem of S/W that runs on consumer electronic devices.
    • What is the “Java Look and Feel”?
      • First of all, what is a “look-and-feel”?
        • The appearance and behavior of a complete set of GUI components.
      • Why do we need a Java look-and-feel?
        • Want to have Java applications that have a consistent look and behavior across multiple platforms
        • The goal of the Java look-and-feel is to provide a distinctive platform-independent appearance and standard behavior.
    • Java look-and-feel
      • Flush 3D style
        • surfaces appear to be in the same plane as the surrounding canvas
        • border has a bevel
      • Drag texture
      • Color model
    • Elements of the Java L&F
      • Style of use/appearance of:
        • Windows
        • Menus
        • Toolbars
        • editor panes
        • dialog boxes
        • alert boxes
    • Java L&F Windows
      • Platform-specific borders, title bar, and window controls
      • “Metal” look and feel window contents – menu bar, toolbar, editor pane, etc.
      • Here’s the code
    • Menus, the Menu Bar
      • Provide access to and info about application’s primary functions
      • Later: guidelines for creation of such menus
    • Drop-down menus
      • Menu separators divide choices into logical groupings
      • Titles highlighted in blue (default Java look and feel theme)
      • Can use keyboard shortcuts instead of the mouse.
      • Mnemonics – another way to access menu items..
    • Keyboard shortcuts
      • keystroke combinations that activate a menu item from the keyboard even if the menu for that command is not currently displayed.
      • usually consist of a modifier key and a character key, like Control-Z, plus a few special keys such as F1 and Delete.
      • Don’t post menus; rather, perform the indicated actions directly.
    • Mnemonic
      • an underlined alphanumeric character in a menu title, menu item, or other interface component.
      • reminds the user how to activate the equivalent command by simultaneously pressing the Alt key and the character key that corresponds to the underlined letter or numeral.
      • See example code for both shortcuts and mnemonics
    • Guidelines for shortcuts …
      • Specify keyboard shortcuts for frequently used menu items; don’t need a shortcut for every command
      •   Display shortcuts using the standard abbreviations for key names (such as Ctrl for the Control key), separated by hyphens.
      • Know the common shortcuts across platforms; use them.
      •   Don’t use the Meta key (the Command key on the Macintosh platform) for a shortcut, except as an alternate for Control. It isn’t available on some target platforms.
    • Java L&F Toolbar
      • displays command and toggle buttons that offer immediate access to the functions of many menu items.
      • divided into functional areas
      • Flush 3D style
    • Java L&F Editor Pane
      • Editor pane inside a scroll pane
    • Java L&F Dialog Boxes
      • use the borders and title bars of the platform they are running on
      • dialog box contents have the Java look and feel
      • Windows, Mac, CDE
    • Java L&F Alert boxes
      • Windows, Mac, CDE
    • Java Foundation Classes
      • An extension to the original Abstract Window Toolkit ( AWT ),
      • Includes:
        • the Swing classes , which define a complete set of GUI components for JFC applications
        • pluggable look and feel designs
        • the Java Accessibility API,
      • all implemented without native code (code that refers to the functions of a specific operating system or is compiled for a specific processor).
      • components include:
        • windows and frames, panels and panes, dialog boxes, menus and toolbars, buttons, sliders, combo boxes, text components, tables, list components, and trees.
    • The Java 2 SDK
      • contains the AWT,
        • the class library that provides the standard application programming interfaces for building GUIs for Java programs.
      • Contains a JFC that also includes
        • the Java 2D API
        • drag and drop
        • other enhancements
    • Support for Accessibility
      • features of the Java 2 SDK that support people with special needs:
        • the Java Accessibility API
          • provides “hooks” for an assistive technology to interact and communicate with JFC components ( screen readers and screen magnifiers.)
        • the Java Accessibility Utilities
          • provides support in locating the objects that implement the Java Accessibility API. (These utilities are necessary for developers who develop only assistive technologies, not mainstream applications.)
        • keyboard navigation, mnemonics, keyboard shortcuts (also called "accelerators"), customizable colors and fonts, and dynamic GUI layout.
        • A “pluggable” look and feel architecture that can be used to build both visual and nonvisual designs, such as audio and tactile UIs
    • Accessibility, continued
      • Keyboard navigation
        • enables users to use the keyboard to move between components, open menus, highlight text, and so on.
        • makes an application accessible to people who find it difficult or impossible to use a mouse.
    • Support for Internationalization
      • J2SDK provides internationalized text handling and resource bundles.
        • support for the bidirectional display of text lines
      • J2SDK provides
        • resource bundles
        • locale-sensitive sorting
        • support for localized numbers, dates, times, and messages.
    • User Interface Components of the JFC
      • Swing, a complete set of user interface components, including windows, dialog boxes, alert boxes, panels and panes, and basic controls.
      • Each JFC component contains
        • a model (the data structure)
        • a user interface (the presentation and behavior of the component)
    • Major JFC UI Components
      • See table of components
    • Java L&F - Recommendations
      • Don’t specify look and feel explicity.
        • cross-platform l&f allows app to appear and perform the same everywhere
        • simplifies the app's development and doc
        • Java look and feel is used by default.
        • If error occurs while specifying name of any l&f, the Java l&f is used by default.
      • Available Look and Feel Designs:
        • Metal
        • Windows
        • CDE/Motif