kstddirs.h

monqueror一个很具有参考价值的源玛

/*
  This file is part of the KDE libraries
  Copyright (C) 1999 Sirtaj Singh Kang <[e-mail]>
                     Stephan Kulow <[e-mail]>
		     Waldo Bastian <[e-mail]>

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Library General Public
  License as published by the Free Software Foundation; either
  version 2 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Library General Public License for more details.

  You should have received a copy of the GNU Library General Public License
  along with this library; see the file COPYING.LIB.  If not, write to
  the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  Boston, MA 02111-1307, USA.
*/

#ifndef SSK_KSTDDIRS_H
#define SSK_KSTDDIRS_H

#include <qstring.h>
#include <qdict.h>
#include <qstringlist.h>
#include <kglobal.h>

class KConfig;
class KStandardDirsPrivate;

/**
* @short Site-independent access to standard KDE directories.
* @author Stephan Kulow <[e-mail]> and Sirtaj Singh Kang <[e-mail]>
* @version $Id: kstddirs.h,v 1.1.1.1 2002/01/16 10:39:56 ymwei Exp $
*
* This is one of the most central classes in kdelibs as
* it provides a basic service: It knows where the files
* reside on the user's hard disk. And it's meant to be the
* only one that knows -- to make the real location as
* transparent as possible to both the user and the applications.
*
* To this end it insulates the application from all information
* and applications always refer to a file with a resource type
* (e.g. icon) and a filename (e.g. khexdit.xpm). In an ideal world
* the application would make no assumption where this file is and
* leave it up to @ref KStandardDirs::findResource("apps", "Home.desktop")
* to apply this knowledge to return /opt/kde/share/applnk/Home.desktop
* or locate("data", "kgame/background.jpg") to return
* /opt/kde/share/apps/kgame/background.jpg
*
* The main idea behind @ref KStandardDirs is that there are several
* toplevel prefixes below which the files lie. One of these prefixes is
* the one where the user installed kdelibs, one is where the
* application was installed, and one is $HOME/.kde, but there
* may be even more. Under these prefixes there are several well
* defined suffixes where specific resource types are to be found.
* For example, for the resource type "html" the suffixes could be
* share/doc/HTML and share/doc/kde/HTML.
* So the search algorithm basicly appends to each prefix each registered
* suffix and tries to locate the file there.
* To make the thing even more complex, it's also possible to register
* absolute paths that @ref KStandardDirs looks up after not finding anything
* in the former steps. They can be useful if the user wants to provide
* specific directories that aren't in his $HOME/.kde directory for,
* for example, icons.
*
* @sect Standard resources that kdelibs allocates are:
*
* @li apps - Applications menu (.desktop files).
* @li cgi - CGIs to run from kdehelp.
* @li config - Configuration files.
* @li data - Where applications store data.
* @li exe - Executables in $prefix/bin. @ref #findExe for a function that takes $PATH into account.
* @li html - HTML documentation.
* @li icon - Icons, see @ref KIconLoader.
* @li lib - Libraries.
* @li locale - Translation files for @ref KLocale.
* @li mime - Mime types.
* @li services - Services.
* @li servicetypes - Service types.
* @li sound - Application sounds.
* @li templates - Templates
* @li wallpaper - Wallpapers.
* @li tmp - Temporary files (specfic for both current host and current user)
* @li socket - UNIX Sockets (specific for both current host and current user)
*
* A type that is added by the class KApplication if you use it, is
* appdata. This one makes the use of the type data a bit easier as it
* appends the name of the application.
* So while you had to @ref locate("data", "appname/filename") so you can
* also write @ref locate("appdata", "filename") if your KApplication instance
* is called "myapp". Please note though that you cannot use the "appdata"
* type if you intend to use it in an applet for Kicker because 'appname' would
* be "Kicker" instead of the applet's name. Therefore, for applets, you've got
* to work around this by using @ref locate("data", "appletname/filename").
*
* @sect KStandardDirs supports the following environment variables:
*
* @li KDEDIRS: This may set an additional number of directory prefixes to
*          search for resources. The directories should be seperated
*          by ':'. The directories are searched in the order they are
*          specified.
* @li KDEDIR:  Used for backwards compatibility. As KDEDIRS but only a single
*          directory may be specified. If KDEDIRS is set KDEDIR is
*          ignored.
* @li KDEHOME: The directory where changes are saved to. This directory is
*          used to search for resources first. If KDEHOME is not
*          specified it defaults to "$HOME/.kde"
*
**/
class KStandardDirs
{
public:
        /**
	 * @ref KStandardDirs constructor. It just initializes the caches.
	 **/
	KStandardDirs( );

	/**
	 * @ref KStandardDirs destructor.
	 */
	virtual ~KStandardDirs();

	/**
	 * Add another search dir to front of the @p fsstnd list.
	 *
	 * @li When compiling kdelibs, the prefix is added to this.
	 * @li KDEDIRS or KDEDIR is taking into account
	 * @li Additional dirs may be loaded from kdeglobals.
	 *
	 * @param dir The directory to append relative paths to.
	 */
	void addPrefix( const QString& dir );

	/**
	 * Add suffixes for types.
	 *
	 * You may add as many as you need, but it is advised that there
	 * is exactly one to make writing definite.
	 * All basic types (@ref kde_default) are added by @ref addKDEDefaults(),
	 * but for those you can add more relative paths as well.
	 *
	 * The later a suffix is added, the higher its priority. Note, that the
	 * suffix should end with / but doesn't have to start with one (as prefixes
	 * should end with one). So adding a suffix for app_pics would look
	 * like KGlobal::dirs()->addResourceType("app_pics", "share/app/pics");
	 *
	 * @param type Specifies a short descriptive string to access
	 * files of this type.
	 * @param relativename Specifies a directory relative to the root
	 * of the KFSSTND.
	 */
	bool addResourceType( const char *type,
			      const QString& relativename );


	/**
	 * Add absolute path at the end of the search path for
	 * particular types (for example in case of icons where
	 * the user specifies extra paths).
	 *
	 * You shouldn't need this
	 * function in 99% of all cases besides adding user-given
	 * paths.
	 *
	 * @param type Specifies a short descriptive string to access files
	 * of this type.
	 * @param absdir Points to directory where to look for this specific
	 * type. Non-existant directories may be saved but pruned.
	 *
	 */
	bool addResourceDir( const char *type,
			     const QString& absdir);

	/**
	 * Try to find resource in the following order:
	 * @li All PREFIX/<relativename> paths (most recent first).
	 * @li All absolute paths (most recent first).
	 *
	 * The filename should be a filename relative to the base dir
	 * for resources. So is a way to get the path to libkdecore.la
	 * to findResource("lib", "libkdecore.la"). KStandardDirs will
	 * then look into the subdir lib of all elements of all prefixes
	 * ($KDEDIRS) for a file libkdecore.la and return the path to
	 * the first one it finds (e.g. /opt/kde/lib/libkdecore.la)
	 *
	 * @param type The type of the wanted resource
	 * @param filename A relative filename of the resource.
	 *
	 * @return A full path to the filename specified in the second
	 *         argument, or QString::null if not found.
	 */
	QString findResource( const char *type,
			      const QString& filename ) const;

	/**
	 * Try to find all directories whose names consist of the
	 * specified type and a relative path. So would
	 * findDirs("apps", "Settings") return
	 * @li /opt/kde/share/applnk/Settings/
	 * @li /home/joe/.kde/share/applnk/Settings/
	 *
	 * Note that it appends / to the end of the directories,
	 * so you can use this right away as directory names.
	 *
	 * @param type The type of the base directory.
	 * @param reldir Relative directory.
	 *
	 * @return A list of matching directories, or an empty
	 *         list if the resource specified is not found.
	 */
	QStringList findDirs( const char *type,
                              const QString& reldir ) const;

	/**
	 * Try to find the directory the file is in.
	 * It works the same as @ref findResource(), but it doesn't
	 * return the filename but the name of the directory.
	 *
	 * This way the application can access a couple of files
	 * that have been installed into the same directory without
	 * having to look for each file.
	 *
	 * findResourceDir("lib", "libkdecore.la") would return the
	 * path of the subdir libkdecore.la is found first in
	 * (e.g. /opt/kde/lib/)
	 *
	 * @return The directory where the file specified in the second
	 *         argument is located, or QString::null if the type
	 *         of resource specified is unknown or the resource
	 *         cannot be found.
	 */
	QString findResourceDir( const char *type,
				 const QString& filename) const;


	/**
	 * Try to find all resources with the specified type.
	 *
	 * The function will look into all specified directories
	 * and return all filenames in these directories.
	 *
	 * @param type The type of resource to locate directories for.
	 * @param filter Only accept filenames that fit to filter. The filter
	 *        may consist of an optional directory and a @ref QRexExp
	 *        wildcard expression. E.g. "images\*.jpg"
	 * @param recursive Specifies if the function should decend
	 *        into subdirectories.
	 * @param uniq If specified,  only return items which have
	 *        unique suffixes - supressing duplicated filenames.
	 *
	 * @return A list of directories matching the resource specified,
	 *         or an empty list if the resource type is unknown.
	 */
	QStringList findAllResources( const char *type,
				       const QString& filter = QString::null,
				       bool recursive = false,
				       bool uniq = false) const;

	/**
	 * Try to find all resources with the specified type.
	 *
	 * The function will look into all specified directories