gecko/modules/libpref/public/nsIPrefBranch.idl

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/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** 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 client code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Alec Flett <alecf@netscape.com>
* Brian Nesse <bnesse@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"
/**
* The nsIPrefBranch interface is used to manipulate the preferences data. This
* object may be obtained from the preferences service (nsIPrefService) and
* used to get and set default and/or user preferences across the application.
*
* This object is created with a "root" value which describes the base point in
* the preferences "tree" from which this "branch" stems. Preferences are
* accessed off of this root by using just the final portion of the preference.
* For example, if this object is created with the root "browser.startup.",
* the preferences "browser.startup.page", "browser.startup.homepage",
* and "browser.startup.homepage_override" can be accessed by simply passing
* "page", "homepage", or "homepage_override" to the various Get/Set methods.
*
* @see nsIPrefService
*
* @status FROZEN
*/
[scriptable, uuid(56c35506-f14b-11d3-99d3-ddbfac2ccf65)]
interface nsIPrefBranch : nsISupports
{
/**
* Values describing the basic preference types.
*
* @see getPrefType
*/
const long PREF_INVALID = 0;
const long PREF_STRING = 32;
const long PREF_INT = 64;
const long PREF_BOOL = 128;
/**
* Called to get the root on which this branch is based, such as
* "browser.startup."
*/
readonly attribute string root;
/**
* Called to determine the type of a specific preference.
*
* @param aPrefName The preference to get the type of.
*
* @return long A value representing the type of the preference. This
* value will be PREF_STRING, PREF_INT, or PREF_BOOL.
*/
long getPrefType(in string aPrefName);
/**
* Called to get the state of an individual boolean preference.
*
* @param aPrefName The boolean preference to get the state of.
*
* @return boolean The value of the requested boolean preference.
*
* @see setBoolPref
*/
boolean getBoolPref(in string aPrefName);
/**
* Called to set the state of an individual boolean preference.
*
* @param aPrefName The boolean preference to set the state of.
* @param aValue The boolean value to set the preference to.
*
* @return NS_OK The value was successfully set.
* @return Other The value was not set or is the wrong type.
*
* @see getBoolPref
*/
void setBoolPref(in string aPrefName, in long aValue);
/**
* Called to get the state of an individual string preference.
*
* @param aPrefName The string preference to retrieve.
*
* @return string The value of the requested string preference.
*
* @see setCharPref
*/
string getCharPref(in string aPrefName);
/**
* Called to set the state of an individual string preference.
*
* @param aPrefName The string preference to set.
* @param aValue The string value to set the preference to.
*
* @return NS_OK The value was successfully set.
* @return Other The value was not set or is the wrong type.
*
* @see getCharPref
*/
void setCharPref(in string aPrefName, in string aValue);
/**
* Called to get the state of an individual integer preference.
*
* @param aPrefName The integer preference to get the value of.
*
* @return long The value of the requested integer preference.
*
* @see setIntPref
*/
long getIntPref(in string aPrefName);
/**
* Called to set the state of an individual integer preference.
*
* @param aPrefName The integer preference to set the value of.
* @param aValue The integer value to set the preference to.
*
* @return NS_OK The value was successfully set.
* @return Other The value was not set or is the wrong type.
*
* @see getIntPref
*/
void setIntPref(in string aPrefName, in long aValue);
/**
* Called to get the state of an individual complex preference. A complex
* preference is a preference which represents an XPCOM object that can not
* be easily represented using a standard boolean, integer or string value.
*
* @param aPrefName The complex preference to get the value of.
* @param aType The XPCOM interface that this complex preference
* represents. Interfaces currently supported are:
* - nsILocalFile
* - nsISupportsString (UniChar)
* - nsIPrefLocalizedString (Localized UniChar)
* - nsIFileSpec (deprecated - to be removed eventually)
* @param aValue The XPCOM object into which to the complex preference
* value should be retrieved.
*
* @return NS_OK The value was successfully retrieved.
* @return Other The value does not exist or is the wrong type.
*
* @see setComplexValue
*/
void getComplexValue(in string aPrefName, in nsIIDRef aType,
[iid_is(aType), retval] out nsQIResult aValue);
/**
* Called to set the state of an individual complex preference. A complex
* preference is a preference which represents an XPCOM object that can not
* be easily represented using a standard boolean, integer or string value.
*
* @param aPrefName The complex preference to set the value of.
* @param aType The XPCOM interface that this complex preference
* represents. Interfaces currently supported are:
* - nsILocalFile
* - nsISupportsString (UniChar)
* - nsIPrefLocalizedString (Localized UniChar)
* - nsIFileSpec (deprecated - to be removed eventually)
* @param aValue The XPCOM object from which to set the complex preference
* value.
*
* @return NS_OK The value was successfully set.
* @return Other The value was not set or is the wrong type.
*
* @see getComplexValue
*/
void setComplexValue(in string aPrefName, in nsIIDRef aType, in nsISupports aValue);
/**
* Called to clear a user set value from a specific preference. This will, in
* effect, reset the value to the default value. If no default value exists
* the preference will cease to exist.
*
* @param aPrefName The preference to be cleared.
*
* @note
* This method does nothing if this object is a default branch.
*
* @return NS_OK The user preference was successfully cleared.
* @return Other The preference does not exist or have a user set value.
*/
void clearUserPref(in string aPrefName);
/**
* Called to lock a specific preference. Locking a preference will cause the
* preference service to always return the default value regardless of
* whether there is a user set value or not.
*
* @param aPrefName The preference to be locked.
*
* @note
* This method can be called on either a default or user branch but, in
* effect, always operates on the default branch.
*
* @return NS_OK The preference was successfully locked.
* @return Other The preference does not exist or an error occurred.
*
* @see unlockPref
*/
void lockPref(in string aPrefName);
/**
* Called to check if a specific preference has a user value associated to
* it.
*
* @param aPrefName The preference to be tested.
*
* @note
* This method can be called on either a default or user branch but, in
* effect, always operates on the user branch.
*
* @note
* If a preference was manually set to a value that equals the default value,
* then the preference no longer has a user set value, i.e. it is
* considered reset to its default value.
* In particular, this method will return false for such a preference and
* the preference will not be saved to a file by nsIPrefService.savePrefFile.
*
* @return boolean true The preference has a user set value.
* false The preference only has a default value.
*/
boolean prefHasUserValue(in string aPrefName);
/**
* Called to check if a specific preference is locked. If a preference is
* locked calling its Get method will always return the default value.
*
* @param aPrefName The preference to be tested.
*
* @note
* This method can be called on either a default or user branch but, in
* effect, always operates on the default branch.
*
* @return boolean true The preference is locked.
* false The preference is not locked.
*
* @see lockPref
* @see unlockPref
*/
boolean prefIsLocked(in string aPrefName);
/**
* Called to unlock a specific preference. Unlocking a previously locked
* preference allows the preference service to once again return the user set
* value of the preference.
*
* @param aPrefName The preference to be unlocked.
*
* @note
* This method can be called on either a default or user branch but, in
* effect, always operates on the default branch.
*
* @return NS_OK The preference was successfully unlocked.
* @return Other The preference does not exist or an error occurred.
*
* @see lockPref
*/
void unlockPref(in string aPrefName);
/**
* Called to remove all of the preferences referenced by this branch.
*
* @param aStartingAt The point on the branch at which to start the deleting
* preferences. Pass in "" to remove all preferences
* referenced by this branch.
*
* @note
* This method can be called on either a default or user branch but, in
* effect, always operates on both.
*
* @return NS_OK The preference(s) were successfully removed.
* @return Other The preference(s) do not exist or an error occurred.
*/
void deleteBranch(in string aStartingAt);
/**
* Returns an array of strings representing the child preferences of the
* root of this branch.
*
* @param aStartingAt The point on the branch at which to start enumerating
* the child preferences. Pass in "" to enumerate all
* preferences referenced by this branch.
* @param aCount Receives the number of elements in the array.
* @param aChildArray Receives the array of child preferences.
*
* @note
* This method can be called on either a default or user branch but, in
* effect, always operates on both.
*
* @return NS_OK The preference list was successfully retrieved.
* @return Other The preference(s) do not exist or an error occurred.
*/
void getChildList(in string aStartingAt,
[optional] out unsigned long aCount,
[array, size_is(aCount), retval] out string aChildArray);
/**
* Called to reset all of the preferences referenced by this branch to their
* default values.
*
* @param aStartingAt The point on the branch at which to start the resetting
* preferences to their default values. Pass in "" to
* reset all preferences referenced by this branch.
*
* @note
* This method can be called on either a default or user branch but, in
* effect, always operates on the user branch.
*
* @return NS_OK The preference(s) were successfully reset.
* @return Other The preference(s) do not exist or an error occurred.
*/
void resetBranch(in string aStartingAt);
};
%{C++
#define NS_PREFBRANCH_CONTRACTID "@mozilla.org/preferencesbranch;1"
#define NS_PREFBRANCH_CLASSNAME "Preferences Branch"
%}