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The three clipboard-related actions are cut, copy, and paste For the Favorites view, you need to provide the ability to cut selected items out of the view, copy selected items, and paste new items into the view using three separate actions
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The copy action translates selected Favorites items into various formats such as resources, and places that information into the clipboard Start by creating a new CopyFavoritesHandler class with a method to safely create and dispose of a clipboard object The clipboard object exists only for the duration of the call to a second execute() method, after which it is disposed
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public class CopyFavoritesHandler extends AbstractHandler { public Object execute(ExecutionEvent event) throws ExecutionException { Clipboard clipboard = new Clipboard(HandlerUtilgetActiveShell(event) getDisplay());
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try { return execute(event, clipboard); } finally { clipboarddispose(); } } }
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Transfer objects convert various formats, such as resources, into platform-specific byte streams and back so that information can be exchanged between different applications (see Section 7383, Custom transfer types, on page 330 for more on transfer types) The following CopyFavoritesHandler methods translate favorite items into resources and text
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public static IResource[] asResources(Object[] objects) { Collection<IResource> resources = new HashSet<IResource>(objectslength); for (int i = 0; i < objectslength; i++) { Object each = objects[i]; if (each instanceof IAdaptable) { IResource res = (IResource) ((IAdaptable) each)getAdapter(IResourceclass); if (res != null) resourcesadd(res); } } return resourcestoArray(new IResource[resourcessize()]); } public static String asText(Object[] objects) { StringBuffer buf = new StringBuffer(); for (int i = 0; i < objectslength; i++) { Object each = objects[i]; if (each instanceof IFavoriteItem) { bufappend("Favorite: "); bufappend(((IFavoriteItem) each)getName()); } else if (each != null) bufappend(eachtoString()); bufappend(SystemgetProperty("lineseparator")); } return buftoString(); }
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And finally, the CopyFavoritesHandler execute() method performs the actual operation
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protected Object execute(ExecutionEvent event, Clipboard clipboard) throws ExecutionException { ISelection selection = HandlerUtilgetCurrentSelection(event);
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if (selection instanceof IStructuredSelection) { Object[] objects = ((IStructuredSelection) selection)toArray(); if (objectslength > 0) { try { clipboardsetContents( new Object[] { asResources(objects), asText(objects), }, new Transfer[] { ResourceTransfergetInstance(), TextTransfergetInstance(), }); } catch (SWTError error) { // Copy to clipboard failed } } } return null; }
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This copy handler will be attached at the global level to the Edit > Copy command and at the local level to a new Copy command in the Favorites view context menu Declare the copy handler in the plug-in manifest (see Section 63, Handlers, on page 236) to associate it with the global Edit > Copy command Command identifiers for the Edit menu are found in orgeclipseuitexteditorIWorkbenchActionDefinitionIds Similar to the expressions described in Section 6210, visibleWhen expression, on page 231, the activeWhen expression specifies that the handler should only be active when the Favorites view is active and the enabledWhen expression specifies that the handler should only be enabled when there are one or more objects selected
<handler commandId="orgeclipseuieditcopy" class= "comqualityeclipsefavoriteshandlersCopyFavoritesHandler"> <activeWhen> <with variable="activePartId"> <equals value= "comqualityeclipsefavoritesviewsFavoritesView" /> </with> </activeWhen> <enabledWhen> <with variable="selection"> <count value="+" /> </with> </enabledWhen> </handler>
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We also want the Copy command to appear in the Favorites view context menu We want the Cut, Copy, and Paste commands to appear next to one another in the context, so start by adding a new named separator to the fillContextMenu() method (see Section 7323, Dynamically building the context menu, on page 317)
menuMgradd(new Separator("edit"));
Then we declare a new command (see Section 611, Defining a command, on page 216), a new menuContribution (see Section 626, Defining a view-specific menu or toolbar item, on page 228) and a new handler (see Section 63, Handlers, on page 236) in the plug-in manifest Use the following locatorURI so that the Copy command shows up only in the Favorites view context menu in the correct position
popup:comqualityeclipsefavoritesviewsFavoritesView before=edit
In the Favorites view context menu, the Copy command is enabled even when there is nothing selected To clean this up, add this enabledWhen expression to the handler so that the menu item is only enabled if there are one or more items selected in the Favorites view
<handler class= "comqualityeclipsefavoriteshandlersCopyFavoritesHandler" commandId="comqualityeclipsefavoritescommandscopy"> <enabledWhen> <with variable="selection"> <count value="+"/> </with> </enabledWhen> </handler>
The cut handler is based on the copy and remove handlers, first using the copy handler to copy the selected Favorites items to the clipboard and then the remove handler to remove the selected items from the Favorites view It is initialized and used much like the copy handler described in the previous section
public class CutFavoritesHandler extends AbstractHandler { IHandler copy = new CopyFavoritesHandler(); IHandler remove = new RemoveFavoritesHandler();