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41 SWT History and Goals
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of completely optimized Java classes that went straight to native as soon as possible The public API was the same, but it was not directed through an intermediate layer OTI used SWT to build VisualAge Micro Edition (VAME), their first IDE written in Java When IBM decided to build a common tools platform (Eclipse) on which they could re-base their successful existing products, they initially built it using Swing It was an early release of Swing in Java 12, and IBM was greatly disappointed with its performance and look-and-feel There were memory leaks in Swing in addition to other defects, which led to its eventual abandonment One of the reasons SWT was chosen was because IBM s tooling effort was intended to compete head-to-head with Microsoft, and it was felt that SWT would give a rich enough UI experience It was a huge risk at the time; SWT had not been ported to many platforms, and also by adopting SWT there was the potential that customers might say: If Swing wasn t good enough for your toolkit, why should we use it Additionally, anyone writing plug-ins would have to use SWT instead of Swing the fear was that there would be a natural antagonism toward learning this new application programming interface (API) There was also the possibility that SWT versus Swing would fragment the Java community All these fears came true However, SWT has found a lot of favor with people who are now using it to program applications with the Eclipse Rich Client Platform (RCP) because they like its higher speed and platform integration Arguably, Sun did take its eye off the ball with the 12 and 13 Swing releases With JDK 14 through 16, Sun s Swing performance and its look-and-feel classes are much improved, so that developers who use it now have a greatly improved toolkit Without SWT threatening to become the new standard, it s difficult to know whether Sun would have done this work to try and catch up, so having the two toolkits is actually good for users of both In the past, interoperability between the two toolkits was poor, although this has improved dramatically since Eclipse 30 SWT is the foundation on which the entire Eclipse UI is based It is fast, native, and multiplatform, but it does not suffer the LCD problem present in AWT or the look-and-feel problem present in Swing SWT does this by taking a best-of-both-worlds approach: It uses native widgets whenever possible on a platform and supplements them with emulated widgets on platforms where they don t exist; a good example of this is the tree widget that exists in native form under Windows, but is emulated under Linux The result is a rich, portable API for building GUI applications that adhere very closely to the lookand-feel of each platform they support
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The Standard Widget Toolkit
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Note: While providing a consistent, high-level, public API, under the covers SWT is very different from one platform to the next SWT has a unique implementation for each platform and low-level SWT APIs map one to one with their platform counterparts For a detailed discussion about how SWT interfaces to the native platform, see wwweclipseorg/ articles/Article-SWT-Design-1/SWT-Design-1html
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SWT Widgets
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SWT provides a rich set of widgets that can be used to create either standalone Java applications or Eclipse plug-ins Before going into detail about each of the widgets you are likely to use, it is instructive to explore a simple standalone SWT example
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Let s start by revisiting the simple Java project and HelloWorld application created in 1, Using Eclipse Tools
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4211 Adding SWT to your project s classpath
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Before you can start using SWT, the SWT libraries need to be added to your project s classpath To add SWT support, do the following: 1 Right-click on the project and select the Properties command to open the Properties dialog 2 Select the Java Build Path > Libraries tab and click the Add External JARs button 3 Drill down to your Eclipse /plugins directory 4 Select orgeclipseswtwin32win32x86_3nnvnnnnjar (or corresponding Linux or OS X JAR) and click OK to finish adding the SWT library to your project s classpath (see Figure 4 1)
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