TT 20 Advanced Topics in Java

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private void addWebButtonToToolBar() { OpenBrowserAction helpAction = new OpenBrowserAction(); helpActionsetURL("http://wwwqualityeclipsecom"); helpActionsetToolTipText("Open a web page"); helpActionsetImageDescriptor( ImageDescriptorcreateFromFile( FavoritesViewclass, "webgif")); getViewSite()getActionBars() getToolBarManager()add(helpAction); }
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We can also add a toolbar button that creates an email message in the user s default email client Use "%0A" when specifying the email s content to create separate lines:
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private void addEmailButtonToToolBar() { OpenBrowserAction emailAction = new OpenBrowserAction(); emailActionsetURL( "mailto:info@qualityeclipsecom" + " Subject=Question" + "&Body=My Question is " + "%0ASecond line" + "%0AThird line"); emailActionsetToolTipText("Send an email"); emailActionsetImageDescriptor( ImageDescriptorcreateFromFile( FavoritesViewclass, "mailgif")); getViewSite()getActionBars() getToolBarManager()add(emailAction); }
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This does not send the message, but signals the email client to create the message with the specific information so that the user can review and
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Opening a browser or creating an email
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send it The code above creates an email message that looks something like this:
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To: info@qualityeclipsecom Subject: Question My Question is Second line Third line
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Tip: Not all systems or browsers support all mailto options For a complete listing of what can be encoded in a mailto request, google mailto syntax , or see http://wwwqualityeclipsecom/util/mailtoSyntaxhtm
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LaunchURL
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The orgeclipsehelpuibrowserLaunchURL class provides another mechanism for opening a browser This action delegate, part of the
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orgeclipsehelpui
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Section 623) that opens a browser on a predefined web page (reading the code, this action appears to have cross platform support, but we ve only tried this on Windows) For example, in our Favorites product, we could add a new action to our top level Favorites menu by adding the following declaration to our plug-in manifest:
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TT 20 Advanced Topics
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<extension point="orgeclipseuiactionSets"> <actionSet label="Favorites ActionSet" visible="true" id="comqualityeclipsefavoritesworkbenchActionSet"> existing declarations here <action label="Open browser on QualityEclipse website" class="orgeclipsehelpuibrowserLaunchURL" menubarPath="comqualityeclipsefavorites workbenchMenu/content" id="comqualityeclipsefavoritesbrowseWebsite" url="http://wwwqualityeclipsecom"> </action> </actionSet> </extension>
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The url attribute in the declaration above specifies the webpage displayed by the LaunchURL action delegate Unfortunately, the plug-in manifest editor does not support the url attribute, so you must switch to the Source page to hand code the attribute
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205 TYPES SPECIFIED IN AN EXTENSION-POINT
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All plug-ins declaring an extension-point use the IConfigurationElementcreateExecutable( )
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plug-ins (see Section 1733) For example, given the following declaration
Types specified in an extension-point
orgeclipseui
plug-in will instantiate the myPackageMyActionDelegate
class when necessary using the createExecutable( ) method:
<extension point="orgeclipseuiactionSets"> <action label="Open Favorites View" icon="icons/samplegif" tooltip="Open the favorites view" menubarPath="myMenu/content" toolbarPath="Normal/additions" id="myProductopenFavoritesView"> class="myPackageMyActionDelegate" </action> </extension>
In the declaration above, only the fully qualified class name is specified, but there are a few hidden surprises that we explore in the following sections
Parameterized types
Types specified in a plug-in manifest are instantiated using their default no argument constructor, so how can they be parameterized For example, let s suppose that you have two very similar functions in your menu How should those functions be implemented One approach is to have two different action delegates, one for each function, with a shared superclass containing all of the common behavior Another approach is to have a single action delegate, but somehow initialize each instance differently to perform a slightly
TT 20 Advanced Topics
different operation but how It is this second option we are going to explore Parameterizing a type, passing additional information to that type during its initialization phase, is accomplished by implementing the
orgeclipsecoreruntimeIExecutableExtension
interface If additional in-
formation is provided in the plug-in manifest, then Eclipse passes the additional information to the type using the setInitializationData method The information arrives via the setInitializationData method in different formats depending upon how it is structured in the plug-in manifest
Types specified in an extension-point
Unstructured Parameters
Figure 20-1 IExecutableExtension with unstructured parameters
One way to parameterize a type is to place a colon at the end of the type s class name followed by a string of information This string is unstructured and has as much or as little information as desired Eclipse parses the class attribute, using the information before the colon to determine the class to be instantiated, while the information after the colon is passed as a String to the type via the setInitializationData method For example, in the declaration above (see Figure 20-1), the action delegate myPackageMyActionDelegate
would be instantiated using its no argument construc-