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- /* ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- * http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- *
- * The Original Code is Mozilla Communicator.
- *
- * The Initial Developer of the Original Code is
- * Netscape Communications.
- * Portions created by the Initial Developer are Copyright (C) 2002
- * the Initial Developer. All Rights Reserved.
- *
- * Contributor(s):
- * Mike Pinkerton <pinkerton@netscape.com>
- * Kathleen Brade <brade@netscape.com>
- *
- * Alternatively, the contents of this file may be used under the terms of
- * either the GNU General Public License Version 2 or later (the "GPL"), or
- * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
- * in which case the provisions of the GPL or the LGPL are applicable instead
- * of those above. If you wish to allow use of your version of this file only
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the MPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * the provisions above, a recipient may use your version of this file under
- * the terms of any one of the MPL, the GPL or the LGPL.
- *
- * ***** END LICENSE BLOCK ***** */
-
- #include "nsISupports.idl"
-
- interface nsITransferable;
- interface nsIDragSession;
- interface nsIDOMEvent;
-
-
- /**
- * Interfaces for overriding the built-in drag, drop, copy, and paste
- * implementations in the content area and editors. Use this to do things
- * such as prevent a drag from starting, adding or removing
- * data and flavors, or preventing the drop.
- *
- * Embedders who want to have these hooks made available should implement
- * nsIClipboardDragDropHooks and use the command manager to send the
- * appropriate commands with these parameters/settings:
- * command: cmd_clipboardDragDropHook
- *
- * params value type possible values
- * "addhook" isupports nsIClipboardDragDropHooks as nsISupports
- * "removehook" isupports nsIClipboardDragDropHooks as nsISupports
- *
- * Notes:
- * * Overrides/hooks need to be added to each window (as appropriate).
- * Adding them to the first window does not enable them for every window.
- * * If more than one implementation is set for a window, the hooks will be
- * called in the order they are added.
- * * Adding the same hook to the same window will not add a second call.
- * Each hook can only be called once per user action/api.
- * * Not all hooks are guaranteed to be called. If there are multiple hooks
- * set for a window, any of them has an opportunity to cancel the action
- * so no further processing will occur.
- * * If any errors occur (without setting the boolean result) the default
- * action will occur.
- * * AllowDrop will be called MANY times during drag so ensure that it is
- * efficient.
- */
-
-
- [scriptable,uuid(e03e6c5e-0d84-4c0b-8739-e6b8d51922de)]
- interface nsIClipboardDragDropHooks : nsISupports
- {
- /**
- * Prevents the drag from starting
- *
- * @param event DOM event (drag gesture)
- *
- * @return TRUE drag can proceed
- * @return FALSE drag is cancelled, does not go to OS
- */
- boolean allowStartDrag(in nsIDOMEvent event);
-
- /**
- * Tells gecko whether a drop is allowed on this content area
- *
- * @param event DOM event (drag over)
- * @param session the drag session from which client can get
- * the flavors present or the actual data
- *
- * @return TRUE indicates to OS that if a drop does happen on this
- * browser, it will be accepted.
- * @return FALSE indicates to OS drop is not allowed. On win32, this
- * will change the cursor to "reject".
- */
- boolean allowDrop(in nsIDOMEvent event, in nsIDragSession session);
-
- /**
- * Alter the flavors or data presented to the OS
- * Used for drag and copy actions
- * Because this can be called many times, it is highly recommended
- * that the implementation be very efficient so user feedback is
- * not negatively impacted.
- *
- * @param event DOM event (drag drop); null if triggered by copy.
- * @param trans the transferable holding the list of flavors
- * and the data for each flavor
- *
- * @return TRUE copy/drag can proceed
- * @return FALSE copy/drag is cancelled, does not go to OS
- */
- boolean onCopyOrDrag(in nsIDOMEvent aEvent, in nsITransferable trans);
-
- /**
- * Provide an alternative action to the built-in behavior when
- * something is dropped on the browser or in an editor
- *
- * @param event DOM event (drag drop); null if triggered by paste.
- * @param trans the transferable holding the list of flavors
- * and the data for each flavor
- *
- * @return TRUE action was handled, do not perform built-in
- * behavior
- * @return FALSE action was not overridden, do built-in behavior
- */
- boolean onPasteOrDrop(in nsIDOMEvent event, in nsITransferable trans);
- };
-
-