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diff --git a/shell/Evolution-Activity.idl b/shell/Evolution-Activity.idl
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+/* -*- Mode: IDL; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
+/*
+ * Activity management for Evolution.
+ *
+ * Authors:
+ *   Ettore Perazzoli <ettore@ximian.com>
+ *
+ * Copyright (C) 2000, 2001 Ximian, Inc.
+ */
+
+module GNOME {
+module Evolution {
+
+interface Activity : Bonobo::Unknown {
+	typedef long ActivityID;
+
+	enum DialogType {
+		DIALOG_TYPE_NONE,
+		DIALOG_TYPE_MESSAGE,
+		DIALOG_TYPE_WARNING,
+		DIALOG_TYPE_INPUT,
+		DIALOG_TYPE_ERROR
+	};
+
+	enum DialogAction {
+		DIALOG_ACTION_DISPLAY,
+		DIALOG_ACTION_POSTPONE
+	};
+
+	exception InvalidIcon {};
+	exception IdNotFound {};
+
+	/* Events propagated through the listener:
+
+	   - "Clicked": The status widget has been clicked on.
+
+	   - "DisplayProgress": Display a nice progress dialog for this
+	     operation.
+
+	   - "DisplayDialog": The dialog that the component has requested
+	     through ::requestDialog() can now be safely displayed.
+
+	   - "Cancelled": The user wants the operation to be cancelled.
+	 */
+
+	/**
+	 * operationStarted:
+	 * @component_id: ID of the component starting the operation.
+	 * @information: Informative string about the operation being performed.
+	 * @cancellable: Whether this operation should be cancellable by
+	 * the user from the shell view.
+	 * @event_listener: Listener which the events for the activity
+	 * widget will be passed to.
+	 * @activity_id: A unique ID for the activity, to be used to update the
+	 * status of the operation.
+	 * @suggest_display: Whether displaying the dialog might be a nice idea.
+	 */
+	void operationStarted (in string component_id,
+			       in AnimatedIcon icon,
+			       in string information,
+			       in boolean cancellable,
+			       in Bonobo::Listener event_listener,
+			       out ActivityID activity_id,
+			       out boolean suggest_display)
+		raises (InvalidIcon);
+
+	/**
+	 * operationProgressing:
+	 * @activity: The unique ID for the activity whose status we want to update.
+	 * @information: New informative string.  If empty, the informative string
+	 * isn't changed.
+	 * @progress: A float from 0.0 to 1.0 indicating the status of completion.
+	 *
+	 * Update the status of the specified @activity.
+	 */
+	void operationProgressing (in ActivityID activity,
+				   in string information,
+				   in float progress)
+		raises (IdNotFound);
+
+	/**
+	 * operationFinished:
+	 * @activity: The unique ID for the activity that has been completed.
+	 *
+	 * Report that the specified @activity has been completed.  After this
+	 * method is invoked, @activity is not considered to be a valid ID
+	 * anymore.
+	 */
+	void operationFinished (in ActivityID activity);
+
+	/**
+	 * requestDialog:
+	 *
+	 * Inform the shell that the specified @activity requires user input
+	 * from a dialog.  The returned value specifies whether the shell wants
+	 * the dialog to be shown now (%DIALOG_ACTION_DISPLAY) or postponed
+	 * (%DIALOG_ACTION_POSTPONE).  If the return value is
+	 * %DIALOG_ACTION_POSTPONE, the component should wait for the
+	 * "DisplayDialog" event before proceeding further.  In that case, the
+	 * shell will flash the label related to this activity, and emit
+	 * "DisplayDialog" through the event source when the user clicks on it.
+	 */
+	DialogAction requestDialog (in ActivityID activity,
+				    in DialogType dialog_type);
+};
+		
+};
+};