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A plug-in fragment provides additional contents to an existing plug-in The plug-in is already installed and should not be modified A fragment is usually stored in the plugins directory together with the other plug-ins When Eclipse detects a fragment its contents are merged with the existing plug-in In Eclipse fragments are used for two different purposes One is to make additional translations available ("language packs") The other use is to define platform-specific contents for an existing plug-in For example, the fragment orgeclipseswtwin32 contains the win32-specific code of SWT Fragments come with a fragmentxml manifest This is an example of a fragment for a language pack for the JDT UI plug-in (orgeclipsejdtui) contributing translations in a nl1jar:
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<fragment name="Java Development Tools UI NL Support" id="orgeclipsejdtuinl1" version="200" plugin-id="orgeclipsejdtui" plugin-version="200"> <runtime> <library name="nl1jar" /> </runtime> </fragment> For fragments that do not contribute any code in the JAR files but resources only, there is another optimization you can make If you change the library element to <library name="nl1jar" library=resource/>, then the class loader only looks for resources in this library and not for classes
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283 Accessibility
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While you externalize strings, it's a good time to give attention to accessibility issues The primary accessibility issues you need to address in your plug-in are: Keyboard access Every action in the plug-in's UI needs to be accessible via the keyboard Object information Enable screen readers Associate labels with controls Information contained in images should also be available as text Display/sound Use color as an enhancement only Support high contrast settings Provide accessible alternatives for significant audio and video content
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In this chapter we will only touch on keyboard access and screen readers The forward pointers contain guidelines for using color and sound An important requirement for an accessible application is that everything in an application can be reached with the keyboard To make menu items and widgets in dialogs more easily accessible, we assign them mnemonics This is done in both the pluginxml and the code by prefixing the mnemonic letter with a "&" A mnemonic is shown with a letter underlined in menus and dialogs When pressing the mnemonic letter, the selection or focus will jump to this item Currently, none of our menu items and dialog items has a mnemonic We should try hard to come up with unique mnemonic letter choices Since Eclipse menus are extensible, collisions can happen The only consequence of a collision is that the user will have to press the mnemonic letter more than once The object contribution to run a test and the auto test label in the property page both need a mnemonic, as shown in Figure 283
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orgeclipsecontributionjunit/pluginproperties
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pluginName=Contributed Junit Plug-in testListeners=Test Listeners propertyPageName=Auto-test
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If you want to test whether your plug-in is accessible from the keyboard, use it while your mouse is unplugged Accessibility goes further than just defining mnemonics For example, another requirement is that you have to accommodate screen readers A screen reader can read the contents of widgets aloud For example, our existing ResultView doesn't address this requirement It only shows a red/green/grey color indication of a test's status To make the view accessible, the color indication has to include some textual label like OK, Failed, Unknown In this chapter we have made our plug-in internationalized and accessible
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Externalized strings Added mnemonics The final bit of work on our plug-in in the next chapter is to explicitly publish its API
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284 Forward Pointers
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Testing your internationalized plug-ins Once you have externalized the strings, you also need to test how your dialogs look with longer strings on all the different platforms For an in-depth article on testing an internationalized plug-in, refer to wwweclipseorg/articles/Article-TVT/how2TestI18nhtml See wwwsection508gov/ for more information on accessibility requirements IBM provides a detailed checklist for developers that is available at www-3ibmcom/able/guidelines/indexhtml For information on how to fulfill accessibility requirements in Eclipse, refer to wwweclipseorg/articles/Article-Accessibility/accessibilityhtml SWT provides additional APIs for accessibility in the packageorgeclipseswtaccessibility For PDE support for creating projects representing a fragment, seeNew > Plug-in Development > Fragment Projects
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