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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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 "MailNewsTypes2.idl"
interface nsIDBChangeAnnouncer;
interface nsIMsgDBHdr;
interface nsIMsgDatabase;
/**
* These callbacks are provided to allow listeners to the message database
* to update their status when changes occur.
*/
[scriptable, uuid(21c56d34-71b9-42bb-9606-331a6a5f8210)]
interface nsIDBChangeListener : nsISupports {
/**
* Callback when message flags are changed.
*
* @param aHdrChanged The changed header.
* @param aOldFlags Message flags prior to change.
* @param aNewFlags Message flags after change.
* @param aInstigator Object that initiated the change.
*/
void onHdrFlagsChanged(in nsIMsgDBHdr aHdrChanged, in unsigned long aOldFlags,
in unsigned long aNewFlags, in nsIDBChangeListener aInstigator);
/**
* Callback when message is marked as deleted.
*
* @param aHdrChanged The message header that is going to be deleted.
* @param aParentKey Key of parent.
* @param aFlags Flags that message has before delete.
* @param aInstigator Object that initiated the change. Can be null.
*/
void onHdrDeleted(in nsIMsgDBHdr aHdrChanged, in nsMsgKey aParentKey, in long aFlags,
in nsIDBChangeListener aInstigator);
/**
* Callback when message is added.
*
* @param aHdrChanged The message header that is added.
* @param aParentKey Parent key of message.
* @param aFlags Flags that new message will have.
* @param aInstigator Object that initiated the change. Can be null.
*/
void onHdrAdded(in nsIMsgDBHdr aHdrChanged, in nsMsgKey aParentKey, in long aFlags,
in nsIDBChangeListener aInstigator);
/**
* Callback when message parent is changed. Parent is changed when message is deleted or moved.
*
* @param aKeyChanged The message key that parent key was changed.
* @param oldParent Old parent key.
* @param newParent New parent key.
* @param aInstigator Object that initiated the change. Can be null.
*/
void onParentChanged(in nsMsgKey aKeyChanged, in nsMsgKey oldParent, in nsMsgKey newParent,
in nsIDBChangeListener aInstigator);
/**
* Callback when announcer is going away. This is good place to release strong pointers to announcer.
*
* @param instigator Object that initiated the change. Can be null.
*/
void onAnnouncerGoingAway(in nsIDBChangeAnnouncer instigator);
/**
* Callback when read flag is changed.
*
* @param aInstigator Object that initiated the change. Can be null.
*/
void onReadChanged(in nsIDBChangeListener aInstigator);
/**
* Callback used in case when "junkscore" property is changed.
*
* @param aInstigator Object that initiated the change. Can be null.
*/
void onJunkScoreChanged(in nsIDBChangeListener aInstigator);
/**
* Callback used in the general case where any field may have changed.
* OnHdrPropertyChanged is called twice per change. On the first call, aPreChange
* is true, and aStatus is undefined. OnHdrPropertyChanged saves any required status in aStatus
* (such as a filter match). The calling function stores the value of aStatus, changes the
* header aHdrToChange, then calls OnHdrPropertyChanged again with aPreChange false. On this
* second call, the stored value of aStatus is provided, so that any changes may be noted.
*
* @param aHdrToChange the message header that is changing.
* @param aPreChange true on first call before change, false on second call after change
* @param aStatus storage location provided by calling routine for status
* @param aInstigator object that initiated the change
*/
void onHdrPropertyChanged(in nsIMsgDBHdr aHdrToChange,
in AUTF8String property,
in boolean aPreChange,
inout uint32_t aStatus,
in nsIDBChangeListener aInstigator);
/**
* Generic notification for extensibility. Common events should be documented
* here so we have a hope of keeping the documentation up to date.
* Current events are:
* "DBOpened" - When a pending listener becomes real. This can happen when
* the existing db is force closed and a new one opened. Only
* registered pending listeners are notified.
*
* @param aDB the db for this event.
* @param aEvent type of event.
*
*/
void onEvent(in nsIMsgDatabase aDB, in string aEvent);
};
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