Figure 6 8 Keys preference page showing Favorites key binding in Java

Making QR Code in Java Figure 6 8 Keys preference page showing Favorites key binding
Figure 6 8 Keys preference page showing Favorites key binding
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IAction versus IActionDelegate
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An Eclipse action is composed of several parts, including the XML declaration of the action in the plug-in s manifest, the IAction object instantiated by the Eclipse UI to represent the action, and the IActionDelegate defined in the plug-in library containing the code to perform the action (see Figure 6 9)
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65 IAction versus IActionDelegate
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Figure 6 9 Action versus IActionDelegate
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This separation of the IAction object, defined and instantiated by the Eclipse user interface based on the plug-in s manifest and the IActionDelegate defined in the plug-in s library, allows Eclipse to represent the action in a menu or toolbar without loading the plug-in that contains the operation until the user selects a specific menu item or clicks on the toolbar Again, this approach represents one of the overarching themes of Eclipse: lazy plug-in initialization
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CHAPTER 6 Commands and Actions
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There are several interesting subtypes of IActionDelegate
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IActionDelegate2 Provides lifecycle events to action delegates; if you are implementing IActionDelegate and need additional information,
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such as when to clean up before the action delegate is disposed, then implement IActionDelegate2 instead In addition, an action delegate implementing IActionDelegate2 will have runWithEvent(IAction, Event) called instead of run(IAction)
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IEditorActionDelegate Provides lifecycle events to action delegates associated with an editor (see Section 693, IEditorActionDelegate, on page 279) IObjectActionDelegate Provides lifecycle events to action delegates associated with a context menu (see Section 673, IObjectActionDelegate, on page 266) IViewActionDelegate Provides lifecycle events to action delegates associated with a view (see Section 683, IViewActionDelegate, on page 273) IWorkbenchWindowActionDelegate Provides lifecycle events to action delegates associated with the workbench window menu bar or toolbar
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Workbench Window Actions
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Where and when an action appears is dependent on the extension point and filter used to define the action This section discusses adding a new menu to the workbench menu bar and a new button to the workbench toolbar using the orgeclipseuiactionSets extension point (see Figure 6 9) These actions are very similar to menu contributions with a locationURI id (see Section 629, locationURI, on page 230) equal to orgeclipseuimainmenu Both the menu item and toolbar button open the Favorites view when selected by a user The user can already open the Favorites view (as outlined in Section 25, Installing and Running the Product, on page 92) but a top-level menu will really show off the new product by providing an easy way to find it
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Tip: A top-level menu is a great way to show off a new product to a user, but be sure to read Section 669, Discussion, on page 255 concerning the pitfalls of this approach
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66 Workbench Window Actions
661 Defining a workbench window menu
To create a new menu to appear in the workbench menu bar, you have to create an actionSet extension in the Favorites plug-in manifest describing the new actions That declaration must describe the location and content of the new menu and reference the action delegate class that performs the operation Open the Favorites plug-in manifest editor, select the Extensions tab, and click the Add button (see Figure 6 3) You can also open the New Extension wizard by right-clicking to display the context menu, then select the New > Extension command Select orgeclipseuiactionSets from the list of all available extension points (see Figure 6 10) If you can t locate orgeclipseuiactionSets in the list, then uncheck the Show only extension points from the required plug-ins checkbox Click the Finish button to add this extension to the plug-in manifest
Figure 6 10
The New Extension wizard showing extension points
Now, back in the Extensions page of the plug-in manifest editor, rightclick on the orgeclipseuiactionSets extension and select New > actionSet This immediately adds a new action set named comqualityeclipsefavoritesactionSet1 in the plug-in manifest Selecting this new action set displays the properties on the right side of the editor Modify them as follows:
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CHAPTER 6 Commands and Actions
id comqualityeclipsefavoritesworkbenchActionSet The unique identifier used to reference the action set label Favorites ActionSet The text that appears in the Customize Perspective dialog visible true Determines whether the action set is initially visible The user can show or hide an action set by selecting Window > Customize Perspective, expanding the Other category in the Customize Perspective dialog, and checking or unchecking the various action sets that are listed Next, add a menu that will appear in the workbench menu bar by rightclicking on the action set you just added and selecting New > menu Note that the name of the new action set changes to Favorites ActionSet when the tree selection changes Select the new menu and set its attributes as follows (see Figure 6 11): id comqualityeclipsefavoritesworkbenchMenu The unique identifier used to reference this menu label Fa&vorites The name of the menu appearing in the workbench menu bar The & is for keyboard accessibility (see Section 6102, Keyboard accessibility, on page 285) path additions The insertion point indicating where the menu will be positioned in the menu bar For more information about additions and insertion points, see Section 665, Insertion points, on page 248