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IStatus
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- A status object represents the outcome of an opera-
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tion All CoreExceptions carry a status object to indicate what went wrong Status objects are also returned by methods needing to provide details of failures (eg, validation methods)
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IResourceStatus
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- Represents status related to resources in the
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Resources plug-in and defines the relevant status code
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TT 3 Eclipse Infrastructure
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constants Status objects created by the Resources plug-in bear its unique id, ResourcesPluginPI_RESOURCES, and one of these status codes
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MultiStatus
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- A concrete multi-status implementation, suitable
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either for instantiating or subclassing
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Status
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362 The Error Log view The Plug-in Development Environment (PDE) provides an Error Log view for inspecting the Eclipse log file To open the Error Log view, select Window > Show View > Other , and in the Show View dialog, expand the PDE Runtime category to find the Error Log view (see Figure 3-6) Double clicking on any entry in the Error Log opens a dialog showing details for the error log entry If Eclipse is installed in C:\Eclipse and the default workspace location is being used, you can find the Eclipse log file at
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C:\Eclipse\workspace\metadata\log
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Eclipse plug-ins
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Figure 3-6
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The Error Log view - This view is provided by the Eclipse platform and displays information and exceptions generated while Eclipse is running
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37 ECLIPSE PLUG-INS
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Commercial plug-ins are built upon one or more base plug-ins that ship as part of the Eclipse They are broken down into several groups, further separated into UI and Core, as listed below UI plug-ins contain aspects of a user interface or rely on other plug-ins that do, while you can use Core plug-ins in a headless environment (an environment without a user interface)
Core a general low level group of non-UI plug-ins comprising basic services such as extension processing, resource
TT 3 Eclipse Infrastructure
tracking, etc (see 9, 17, and 22) SWT a general library of UI widgets tightly integrated with the underlying OS, but with an OS independent API (see s 4 and 19) JFace a general library of additional UI functionality built on top of SWT (see s 5 and 11) Workbench Core plug-ins providing non-UI behavior specific to the Eclipse IDE itself such as projects, project natures, and builders Workbench UI plug-ins providing UI behavior specific to the Eclipse IDE itself such as editors, views, perspectives, actions, and preferences (see s 6, 7, 8, 10, and 12) Team a group of plug-ins providing services for integrating different types of source code control management systems (eg CVS) into the Eclipse IDE Help plug-ins that provide documentation for the Eclipse IDE as part of the Eclipse IDE (see 15) JDT Core non-UI based Java Development Tooling plug-
Eclipse plug-ins
ins for the Eclipse IDE JDT UI Java Development Tooling UI plug-ins for the Eclipse IDE (see 18)
REFERENCES
Eclipse-Overviewpdf Available on the eclipseorg website Notes on the Eclipse Plug-in Architecture http://wwwbolourcom/papers/eclipse/plugin_architecturehtml Beck, Kent, and Erich Gamma, Contributing to Eclipse (pre-publication draft) 2003 http://groupsyahoocom/group/contributingtoeclipse/files/030410pdf Rufer, Russ, Sample Code for Testing a Plug-in Into Existence, Yahoo Groups Message 1571, Silicon Valley Patterns Group http://groupsyahoocom/group/siliconvalleypatterns/message/1571 Gamma, Erich, Richard Helm, Ralph Johnson, John Vlissides, Design Patterns, Elements of Reusable Object-Oriented Software, Addition-Wesley, 1995 Buschmann, Frank, et al, Pattern-Oriented Software Architecture, John Wiley and Sons, 1996 Estberg, Don How the Minimum Set of Platform Plugins Are Related, Wiki Page 2587, Eclipse Wiki http://eclipsewikiswikinet/2587
C H A P T E R
The Simple Widget Toolkit
The Simple Widget Toolkit (SWT) is a thin compatibility layer on top
of the platform s native controls SWT provides the foundation for the entire Eclipse user interface We start this chapter with some history and philosophy of SWT, and then dive into using SWT to build applications We will cover most of the widgets commonly encountered and the layout managers used to arrange them within a window We finish with a discussion of various resource management issues to be considered when using SWT
TT 4 The Simple Widget Toolkit
41 SWT HISTORY AND GOALS
SWT has its roots going back more than a dozen years to work that Object Technology International (then an independent pioneering object-oriented software company and now a part of IBM) did in creating multi-platform, portable, native widget interfaces for Smalltalk (originally for OTI Smalltalk which became IBM Smalltalk in 1993) IBM Smalltalk s Common Widget (CW) layer provided fast, native access to multiple platform widget sets while still providing a common API without suffering the lowest common denominator (LCD) problem typical of other portable GUI toolkits For many years, IBM had been using Smalltalk as its secret weapon when building development tools (IBM s first Java IDE, VisualAge for Java was even written in Smalltalk), but Smalltalk had deployment and configuration problems that ultimately doomed its long-term use at IBM Java s promise of universal portability and ubiquitous virtual machines on every desktop was very appealing to the folks at IBM responsible for cre-