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Eclipse Plug-in Development Beginner's Guide

You're reading from   Eclipse Plug-in Development Beginner's Guide Extend and customize Eclipse

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Product type Paperback
Published in Aug 2016
Publisher
ISBN-13 9781783980697
Length 458 pages
Edition 2nd Edition
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Author (1):
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Alex Blewitt Alex Blewitt
Author Profile Icon Alex Blewitt
Alex Blewitt
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Table of Contents (17) Chapters Close

Preface 1. Creating Your First Plug-in 2. Creating Views with SWT FREE CHAPTER 3. Creating JFace Viewers 4. Interacting with the User 5. Working with Preferences 6. Working with Resources 7. Creating Eclipse 4 Applications 8. Migrating to Eclipse 4.x 9. Styling Eclipse 4 Applications 10. Creating Features, Update Sites, Applications, and Products 11. Automated Testing of Plug-ins 12. Automated Builds with Tycho 13. Contributing to Eclipse A. Using OSGi Services to Dynamically Wire Applications B. Pop Quiz Answers Index

Time for action: passing command parameters

Displaying a message to System.out shows that the command works, but what if the command needed to pick up local state? Fortunately, the @Named and @Inject annotations allow objects to be injected into the method when it is called.

  1. Modify the hello method so that instead of printing a message to System.out, it opens a dialog window, using the active shell:
    public void hello(@Named(IServiceConstants.ACTIVE_SHELL) Shell s){
      MessageDialog.openInformation(s, "Hello World",
        "Welcome to Eclipse 4 technology");
    }
  2. Other arguments can be passed in from the context, managed by the IEclipseContext interface. For example, using the math.random function from earlier, a value could be injected into the handler:
    public void hello(@Named(IServiceConstants.ACTIVE_SHELL) Shell s,
      @Named("math.random") double value) {
  3. If the same handler is being used for different functions (for example, Paste and Paste Special), they can be disambiguated...
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