mirror of https://github.com/fltk/fltk
289 lines
8.7 KiB
C++
289 lines
8.7 KiB
C++
//
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// "$Id$"
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//
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// Preferences .
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//
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// Copyright 2002-2009 by Matthias Melcher.
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU Library General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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// USA.
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//
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// Please report all bugs and problems on the following page:
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//
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// http://www.fltk.org/str.php
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//
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/* \file
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Fl_Preferences class . */
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#ifndef Fl_Preferences_H
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# define Fl_Preferences_H
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# include <stdio.h>
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# include "Fl_Export.H"
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/**
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\brief Fl_Preferences provides methods to store user
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settings between application starts.
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It is similar to the
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Registry on WIN32 and Preferences on MacOS, and provides a
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simple configuration mechanism for UNIX.
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Fl_Preferences uses a hierarchy to store data. It
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bundles similar data into groups and manages entries into those
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groups as name/value pairs.
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Preferences are stored in text files that can be edited
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manually. The file format is easy to read and relatively
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forgiving. Preferences files are the same on all platforms. User
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comments in preference files are preserved. Filenames are unique
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for each application by using a vendor/application naming
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scheme. The user must provide default values for all entries to
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ensure proper operation should preferences be corrupted or not
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yet exist.
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Entries can be of any length. However, the size of each
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preferences file should be kept small for performance
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reasons. One application can have multiple preferences files.
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Extensive binary data however should be stored in separate
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files: see getUserdataPath().
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\note Starting with FLTK 1.3, preference databases are expected to
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be in utf8 encoding. Previous databases were stored in the
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current chracter set or code page which renders them incompatible
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for text entries using international characters.
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*/
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class FL_EXPORT Fl_Preferences
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{
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public:
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/**
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Define the scope of the preferences.
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*/
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enum Root {
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SYSTEM=0, ///< Preferences are used system-wide
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USER ///< Preferences apply only to the current user
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};
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/**
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Every Fl_Preferences-Group has a uniqe ID.
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ID's can be retrieved from an Fl_Preferences-Group and can then be used
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to create more Fl_Preference references to the same data set, as long as the
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database remains open.
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*/
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typedef void *ID;
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static const char *newUUID();
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Fl_Preferences( Root root, const char *vendor, const char *application );
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Fl_Preferences( const char *path, const char *vendor, const char *application );
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Fl_Preferences( Fl_Preferences &parent, const char *group );
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Fl_Preferences( Fl_Preferences *parent, const char *group );
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Fl_Preferences( Fl_Preferences &parent, int groupIndex );
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Fl_Preferences( Fl_Preferences *parent, int groupIndex );
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Fl_Preferences(const Fl_Preferences&);
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Fl_Preferences( ID id );
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~Fl_Preferences();
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/** Return an ID that can later be reused to open more references to this dataset.
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*/
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ID id() { return (ID)node; }
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/** Remove the group with this ID from a database.
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*/
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static char remove(ID id_) { return ((Node*)id_)->remove(); }
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/** Return the name of this entry.
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*/
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const char *name() { return node->name(); }
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/** Return the the full path to this entry.
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*/
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const char *path() { return node->path(); }
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int groups();
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const char *group( int num_group );
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char groupExists( const char *key );
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char deleteGroup( const char *group );
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char deleteAllGroups();
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int entries();
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const char *entry( int index );
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char entryExists( const char *key );
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char deleteEntry( const char *entry );
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char deleteAllEntries();
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char clear();
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char set( const char *entry, int value );
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char set( const char *entry, float value );
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char set( const char *entry, float value, int precision );
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char set( const char *entry, double value );
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char set( const char *entry, double value, int precision );
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char set( const char *entry, const char *value );
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char set( const char *entry, const void *value, int size );
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char get( const char *entry, int &value, int defaultValue );
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char get( const char *entry, float &value, float defaultValue );
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char get( const char *entry, double &value, double defaultValue );
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char get( const char *entry, char *&value, const char *defaultValue );
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char get( const char *entry, char *value, const char *defaultValue, int maxSize );
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char get( const char *entry, void *&value, const void *defaultValue, int defaultSize );
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char get( const char *entry, void *value, const void *defaultValue, int defaultSize, int maxSize );
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int size( const char *entry );
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char getUserdataPath( char *path, int pathlen );
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void flush();
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// char export( const char *filename, Type fileFormat );
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// char import( const char *filename );
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char copyTo(class Fl_Tree*);
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/**
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'Name' provides a simple method to create numerical or more complex
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procedural names for entries and groups on the fly.
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Example: prefs.set(Fl_Preferences::Name("File%d",i),file[i]);.
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See test/preferences.cxx as a sample for writing arrays into preferences.<p>
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'Name' is actually implemented as a class inside Fl_Preferences. It casts
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into const char* and gets automatically destroyed after the enclosing call
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ends.
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*/
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class FL_EXPORT Name {
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char *data_;
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public:
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Name( unsigned int n );
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Name( const char *format, ... );
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/**
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Return the Name as a "C" string.
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\internal
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*/
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operator const char *() { return data_; }
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~Name();
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};
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/** \internal An entry associates a preference name to its corresponding value */
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struct Entry
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{
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char *name, *value;
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};
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private:
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Fl_Preferences() : node(0), rootNode(0) { }
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Fl_Preferences &operator=(const Fl_Preferences&);
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static char nameBuffer[128];
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static char uuidBuffer[40];
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static Fl_Preferences *runtimePrefs;
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class RootNode;
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class FL_EXPORT Node // a node contains a list to all its entries
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{ // and all means to manage the tree structure
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Node *child_, *next_;
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union { // these two are mutually exclusive
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Node *parent_; // top_ bit clear
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RootNode *root_; // top_ bit set
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};
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char *path_;
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Entry *entry_;
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int nEntry_, NEntry_;
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unsigned char dirty_:1;
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unsigned char top_:1;
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unsigned char indexed_:1;
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// indexing routines
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Node **index_;
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int nIndex_, NIndex_;
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void createIndex();
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void updateIndex();
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void deleteIndex();
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public:
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static int lastEntrySet;
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public:
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Node( const char *path );
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~Node();
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char copyTo(class Fl_Tree*, class Fl_Tree_Item*);
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// node methods
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int write( FILE *f );
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const char *name();
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const char *path() { return path_; }
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Node *find( const char *path );
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Node *search( const char *path, int offset=0 );
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Node *childNode( int ix );
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Node *addChild( const char *path );
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void setParent( Node *parent );
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Node *parent() { return top_?0L:parent_; }
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void setRoot(RootNode *r) { root_ = r; top_ = 1; }
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RootNode *findRoot();
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char remove();
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char dirty();
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void deleteAllChildren();
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// entry methods
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int nChildren();
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const char *child( int ix );
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void set( const char *name, const char *value );
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void set( const char *line );
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void add( const char *line );
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const char *get( const char *name );
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int getEntry( const char *name );
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char deleteEntry( const char *name );
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void deleteAllEntries();
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int nEntry() { return nEntry_; }
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Entry &entry(int i) { return entry_[i]; }
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};
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friend class Node;
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class FL_EXPORT RootNode // the root node manages file paths and basic reading and writing
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{
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Fl_Preferences *prefs_;
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char *filename_;
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char *vendor_, *application_;
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public:
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RootNode( Fl_Preferences *, Root root, const char *vendor, const char *application );
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RootNode( Fl_Preferences *, const char *path, const char *vendor, const char *application );
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RootNode( Fl_Preferences * );
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~RootNode();
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int read();
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int write();
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char getPath( char *path, int pathlen );
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};
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friend class RootNode;
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protected:
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Node *node;
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RootNode *rootNode;
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};
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#endif // !Fl_Preferences_H
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//
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// End of "$Id$".
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//
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