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diff --git a/embedding/components/commandhandler/nsIControllerCommand.idl b/embedding/components/commandhandler/nsIControllerCommand.idl
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+#include "nsICommandParams.idl"
+
+/**
+ * nsIControllerCommand
+ *
+ * A generic command interface. You can register an nsIControllerCommand
+ * with the nsIControllerCommandTable.
+ */
+
+[scriptable, uuid(0eae9a46-1dd2-11b2-aca0-9176f05fe9db)]
+interface nsIControllerCommand : nsISupports
+{
+
+ /**
+ * Returns true if the command is currently enabled. An nsIControllerCommand
+ * can implement more than one commands; say, a group of related commands
+ * (e.g. delete left/delete right). Because of this, the command name is
+ * passed to each method.
+ *
+ * @param aCommandName the name of the command for which we want the enabled
+ * state.
+ * @param aCommandContext a cookie held by the nsIControllerCommandTable,
+ * allowing the command to get some context information.
+ * The contents of this cookie are implementation-defined.
+ */
+ boolean isCommandEnabled(in string aCommandName, in nsISupports aCommandContext);
+
+ void getCommandStateParams(in string aCommandName, in nsICommandParams aParams, in nsISupports aCommandContext);
+
+ /**
+ * Execute the name command.
+ *
+ * @param aCommandName the name of the command to execute.
+ *
+ * @param aCommandContext a cookie held by the nsIControllerCommandTable,
+ * allowing the command to get some context information.
+ * The contents of this cookie are implementation-defined.
+ */
+ void doCommand(in string aCommandName, in nsISupports aCommandContext);
+
+ void doCommandParams(in string aCommandName, in nsICommandParams aParams, in nsISupports aCommandContext);
+
+};
+