102 lines
3.9 KiB
Plaintext
102 lines
3.9 KiB
Plaintext
/* 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"
|
|
|
|
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);
|
|
};
|
|
|