Examples of org.eclipse.ui.operations.OperationHistoryActionHandler

org.eclipse.ui.operations.OperationHistoryActionHandler

OperationHistoryActionHandler implements common behavior for the undo and redo actions. It supports filtering of undo or redo on a particular undo context. If an undo context is not specified, or there has been no history available for the specified undo context, then the workbench undo context will be used.

OperationHistoryActionHandler provides an adapter in the info parameter of the IOperationHistory undo and redo methods that is used to get UI info for prompting the user during operations or operation approval. Adapters are provided for org.eclipse.ui.IWorkbenchWindow, org.eclipse.swt.widgets.Shell, org.eclipse.ui.IWorkbenchPart, org.eclipse.core.commands.IUndoContext, and org.eclipse.runtime.IProgressMonitor.

OperationHistoryActionHandler assumes a linear undo/redo model. When the handler is run, the operation history is asked to perform the most recent undo/redo for the handler's undo context. The handler can be configured (using #setPruneHistory(true)) to flush the operation undo or redo history for the handler's undo context when there is no valid operation on top of the history. This avoids keeping a stale history of invalid operations. By default, pruning does not occur and it is assumed that clients of the particular undo context are pruning the history when necessary.
@since 3.1

    IUndoContext undoContext= getUndoContext();
    if (undoContext != null) {
      // Use actions provided by global undo/redo
      
      // Create the undo action
      OperationHistoryActionHandler undoAction= new UndoActionHandler(getEditorSite(), undoContext);
      PlatformUI.getWorkbench().getHelpSystem().setHelp(undoAction, IAbstractTextEditorHelpContextIds.UNDO_ACTION);
      undoAction.setActionDefinitionId(IWorkbenchActionDefinitionIds.UNDO);
      registerUndoRedoAction(ITextEditorActionConstants.UNDO, undoAction);


      // Create the redo action.
      OperationHistoryActionHandler redoAction= new RedoActionHandler(getEditorSite(), undoContext);
      PlatformUI.getWorkbench().getHelpSystem().setHelp(redoAction, IAbstractTextEditorHelpContextIds.REDO_ACTION);
      redoAction.setActionDefinitionId(IWorkbenchActionDefinitionIds.REDO);
      registerUndoRedoAction(ITextEditorActionConstants.REDO, redoAction);


      // Install operation approvers
      IOperationHistory history= OperationHistoryFactory.getOperationHistory();

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    IUndoContext undoContext= getUndoContext();
    if (undoContext != null) {
      // Use actions provided by global undo/redo


      // Create the undo action
      OperationHistoryActionHandler undoAction= new UndoActionHandler(getEditorSite(), undoContext);
      PlatformUI.getWorkbench().getHelpSystem().setHelp(undoAction, IAbstractTextEditorHelpContextIds.UNDO_ACTION);
      undoAction.setActionDefinitionId(IWorkbenchCommandConstants.EDIT_UNDO);
      registerUndoRedoAction(ITextEditorActionConstants.UNDO, undoAction);


      // Create the redo action.
      OperationHistoryActionHandler redoAction= new RedoActionHandler(getEditorSite(), undoContext);
      PlatformUI.getWorkbench().getHelpSystem().setHelp(redoAction, IAbstractTextEditorHelpContextIds.REDO_ACTION);
      redoAction.setActionDefinitionId(IWorkbenchCommandConstants.EDIT_REDO);
      registerUndoRedoAction(ITextEditorActionConstants.REDO, redoAction);


      // Install operation approvers
      IOperationHistory history= OperationHistoryFactory.getOperationHistory();

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