1 / 9

13. JavaFX

13. JavaFX. JavaFX Intro. Sun's answer to the popularity of scripting languages problems with Java GUI AWT is very basic Swing is too complex, too cumbersome, too voluminous and gained therefore little popularity problems with RIA and multimedia in Java JavaSound is too low-level

justus
Download Presentation

13. JavaFX

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 13. JavaFX

  2. JavaFX Intro • Sun's answer to • the popularity of scripting languages • problems with Java GUI • AWT is very basic • Swing is too complex, too cumbersome, too voluminous and gained therefore little popularity • problems with RIA and multimedia in Java • JavaSound is too low-level • JMF (Java Media Framework) is virtually unsupported • Java 2D is good, but follows different design than other media packages • Image IO is good, also follows different design • Java 3D is completely separate, self-contained software monolith • Java never really made it to the desktop • But, the building blocks are there

  3. Building Blocks • Java language itself • very popular • over 6Mio. developers • major industry support (IBM, Google, Oracle; almost everyone, except Microsoft) • many universities adopted Java as prime teaching language • most programming books now use Java • widely used • server-side web programming • cell phones • TV set-top boxes • Rich set of libraries, e.g., • Remote Method Invocation (RMI) • XML Web Services (JAX-WS). • Applets • supported by most browsers • either directly with <applet> tag • or at least as using the Java plug-in • some PC's have Java pre-installed • but not as widely available as Flash • WebStart • applets and applications can be downloaded to desktop

  4. Features • Separate scripting language "JavaFX Script" • Multiplatform • browsers • desktop • cell phones • TV settop boxes • Multimedia • text • GUI widgets • graphics in 2D and 3D • animations • audio and video • Integration for graphic designers • Adobe Photoshop and Illustrator plugins for JavaFX • direct manipulation of assets, animation paths, etc. • Drag to install

  5. Concepts • Based on Java and Java tools • JDK • Swing GUI • applets • Java plugin • WebStart • Scripting-like, but compiled • efficient • no eval() support • Supported by NetBeans IDE • preview • building into jar files with ant and jnlp files • Scripts can • directly use Java classes (e.g. all of JDK)

  6. JavaFX Script • Syntax more like JavaScript then Java • less cryptic • function instead of method • var(resp. varfor constants) instead of declaration via type • Object-oriented • classes • e.g., var home = Address {street: "1 Main Street"; city: "Honolulu"; zip: "HI 96813";} • inheritance • e.g., var student = student {name: "John Wu"; address: home;} • override function • properties • encapsulation • public, (private is default) , protected , package, public-read, public-init • anonymous functions • e.g., action: function () {nextTick ()}

  7. JavaFX Script Highlights • Variables • can, but don't need to be typed • entire expressions can be "interpolated into a string using {expression} • e.g., "4+5={4+5}" • strings can be enclosed in " as well as in ' • Types • String, Number, Integer, Boolean, Duration, Void, Null • e.g.,var delay: Duration = 50ms // s, m, h also valid suffixes • Boolean operators: not, and, or • Arrays and called Sequences • varnums = [1..5]; // same as: varnums = [1,2,3,4,5]; • various operations, such as appending, inserting, deleting elements, as well as subsequences • Statements • for (variable in sequence) • e.g., for (i in [1..10]) {…}

  8. Binding • Keyword bind associates a variable with the value of a bound expression • bound expressions • variable • expression • function call • bound function • when the variable 's value changes, the code of the bound expression is re-evaluated • Binding is used for • animation • handling interactions with GUI widgets • e.g., transforms: Rotate {angle: bind seconds * 6} • see: java.sun.com/javafx/1/tutorials/core/dataBinding/index.html

  9. Potential Problems • On many PCs, applets are not installed • compare with Flash which has 90%+ penetration • Downloading Java takes a lot of time • Swing packages are huge • Java upgrades are relatively frequent • upgrades (= downloads) are necessary • Competition: • Adobe Flex • not free

More Related