IProgressMonitor in Java

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941 IProgressMonitor
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The orgeclipsecoreruntimeIProgressMonitor interface provides methods for indicating when an operation has started, how much has been done, and when it is complete
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beginTask(String, int) Called once by the operation to indicate that the operation has started and approximately how much work must be done before it is complete This method must be called exactly once per instance of a progress monitor done() Called by the operation to indicate that it is complete isCanceled() The operation should periodically poll this method to
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setCanceled(boolean) This method is typically called by UI code setting the canceled state to true when the user clicks on the Cancel but-
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CHAPTER 9 Resource Change Tracking setTaskName(String) Sets the task name displayed to the user Usu-
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ally, there is no need to call this method because the task name is set by beginTask(String, int)
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worked(int) Called by the operation to indicate that the specified number of units of work has been completed
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The IProgressMonitorWithBlocking interface extends IProgressMonitor for monitors that want to support feedback when an activity is blocked due to concurrent activity in another thread If a running operation ever calls the setBlocked method listed below, it must eventually call clearBlocked before the operation completes
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clearBlocked() Called by an operation to indicate that the operation is no longer blocked setBlocked(IStatus) Called by an operation to indicate that this operation is blocked by some background activity
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942 Classes for displaying progress
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Eclipse provides several classes that either implement the IProgressMonitor interface or provide a progress monitor via the IRunnableWithProgress interface These classes are used under different circumstances to notify the user of the progress of long-running operations
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SubProgressMonitor A progress monitor passed by a parent operation to a suboperation so that the suboperation can notify the user of progress as a portion of the parent operation (see Section 93, Batching Change Events, on page 414) NullProgressMonitor A progress monitor that supports cancellation but does not provide any user feedback Suitable for subclassing ProgressMonitorWrapper A progress monitor that wraps another progress monitor and forwards IProgressMonitor and IProgressMonitorWithBlocking methods to the wrapped progress monitor Suitable for subclassing WorkspaceModifyOperation An operation that batches resource change events and provides a progress monitor as part of its execution (see Section 93, Batching Change Events, on page 414) ProgressMonitorPart An SWT composite consisting of a label displaying the task and subtask name, and a progress indicator to show progress
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94 Progress Monitor
ProgressMonitorDialog Opens a dialog that displays progress to the user and provides a progress monitor used by the operation to relate that information TimeTriggeredProgressMonitorDialog Waits for a specified amount of time during operation execution then opens a dialog that displays progress to the user and provides a progress monitor used by the operation to relate that information If the operation completes before the specified amount of time, then no dialog is opened This is an internal workbench class but is listed here because the concept and its functionality is interesting For more, see Section 944, IProgressService, on page 419 and Bugzilla entry 123797 at bugseclipseorg/bugs/show_bugcgi id=123797 WizardDialog When opened, optionally provides progress information as part of the wizard The wizard implements the IRunnableContext, and thus the operation can call run(boolean, boolean, IRunnableWithProgress) and display progress in the wizard via the provided
progress monitor (see Section 1123, IWizardContainer, on page 468 and Section 1126, Wizard example, on page 473) As an example, we implement a new DeleteResourcesHandler to open a ProgressMonitorDialog and then execute DeleteResourcesOperation to perform the actual operation The new DeleteResourcesHandler class extends AbstractHandler and contains an execute method like this:
public Object execute(ExecutionEvent event) throws ExecutionException {
ISelection selection = HandlerUtilgetCurrentSelection(event); if (!(selection instanceof IStructuredSelection)) return null; IStructuredSelection structSel = (IStructuredSelection) selection; // Build a collection of selected resources final Collection<IResource> resources = new HashSet<IResource>(); for (Iterator< > iter = structSeliterator(); iterhasNext();) { Object element = iternext(); if (element instanceof IAdaptable) element = ((IAdaptable) element)getAdapter(IResourceclass); if ((element instanceof IResource)) resourcesadd((IResource) element); } // Execute the operation try { // Display progress either using the ProgressMonitorDialog // Shell shell = HandlerUtilgetActiveShell(event); // IRunnableContext context = new ProgressMonitorDialog(shell);