Merge branch 'master' of http://scm.trinitydesktop.org/scm/git/tdelibs

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+/*
+    This file is part of libtderesources
+
+    Copyright (c) 2001-2003 Cornelius Schumacher <schumacher@kde.org>
+    Copyright (c) 2002 Jan-Pascal van Best <janpascal@vanbest.org>
+
+    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., 51 Franklin Street, Fifth Floor,
+    Boston, MA 02110-1301, USA.
+*/
+#ifndef TDERESOURCES_RESOURCE_H
+#define TDERESOURCES_RESOURCE_H
+
+#include <tqmutex.h>
+#include <tqvaluelist.h>
+#include <tqwidget.h>
+
+#include <klibloader.h>
+
+class TDEConfig;
+
+namespace KRES {
+
+class ConfigWidget;
+
+/**
+  \mainpage The KDE Resource library
+ 
+  The KDE Resource framework can be used to manage resources of
+  different types, organized in families. The Resource framework
+  is for example used for addressbook resources in libkabc and for
+  calendar resources in libkcal.
+ 
+  When you want to use the framework for a new family, you need to
+  <ul><li>Define a name for your resource family</li>
+  <li>subclass Resource and add the fields and method that are needed
+  in your application</li>
+  <li>If needed, override the doOpen() and doClose() methods.
+  <li>In your application, you can use ResourceManager to keep track
+  of the resources in your family, and you can use ResourceSelectDialog
+  to let the user select a single resource.</li>
+  </ul>
+ 
+  When you want to add a new resource type to an existing resource family,
+  you need to
+  <ul><li>Further subclass the family-specific Resource to implement
+  resource type-specific operation</li>
+  <li>Subclass ResourceConfigWidget to provide a configuration widget
+  for your new resource type</li>
+  <li>Provide a .desktop file so that the new resource type can be found
+  automatically by the ResourceManager</li>
+  </ul>
+ 
+  Example:
+ 
+  <B>resourceexample.h</B>:
+\code
+#include <tdeconfig.h>
+#include <tderesources/resource.h>
+
+class ResourceExample : public KRES::Resource
+{
+  public:
+    ResourceExample( const TDEConfig * );
+    ~ResourceExample();
+    void writeConfig( TDEConfig *config );
+
+  private:
+    TQString mLocation;
+    TQString mPassword;
+}
+\endcode
+
+  <B>resourceexample.cpp</B>:
+\code
+#include <tdeconfig.h>
+
+#include "resourceexample.h"
+
+ResourceExample::ResourceExample( const TDEConfig *config )
+    : Resource( config )
+{
+  if ( config ) {
+    mLocation = config->readPathEntry( "Location" );
+    mPassword = KStringHandler::obscure( config->readEntry( "Password" ) );
+  } else {
+    mLocation = ""; // Or some sensible default
+    mPassword = "";
+  }
+}
+
+void ResourceExample::writeConfig( TDEConfig *config )
+{
+  KRES::Resource::writeConfig( config );
+  config->writePathEntry( "Location", mLocation );
+  config->writeEntry( "Password", KStringHandler::obscure( mPassword ) );
+}
+
+extern "C"
+{
+  KRES::ResourceExample *config_widget( TQWidget *parent ) {
+    return new ResourceExampleConfig( parent, "Configure Example Resource" );
+  }
+
+  KRES::Resource *resource( const TDEConfig *config ) {
+    return new ResourceExample( config );
+  }
+}
+\endcode
+
+  <B>resourceexampleconfig.h</B>:
+\code
+#include <klineedit.h>
+#include <tderesources/resourceconfigwidget.h>
+
+#include "resourceexample.h"
+
+class ResourceExampleConfig : public KRES::ResourceConfigWidget
+{
+    Q_OBJECT
+  public:
+    ResourceExampleConfig( TQWidget *parent = 0, const char *name = 0 );
+
+  public slots:
+    virtual void loadSettings( KRES::Resource *resource);
+    virtual void saveSettings( KRES::Resource *resource );
+
+  private:
+    KLineEdit *mLocationEdit;
+    KLineEdit *mPasswordEdit;
+};
+\endcode
+
+  <B>resourceexampleconfig.cpp</B>:
+\code
+#include <tqlayout.h>
+#include <tqlabel.h>
+#include <tderesources/resourceconfigwidget.h>
+#include "resourceexample.h"
+#include "resourceexampleconfig.h"
+
+ResourceExampleConfig::ResourceExampleConfig( TQWidget *parent,  const char *name )
+  : KRES::ResourceConfigWidget( parent, name )
+{
+  TQGridLayout *mainLayout = new TQGridLayout( this, 2, 2 );
+
+  TQLabel *label = new TQLabel( i18n( "Location:" ), this );
+  mHostEdit = new KLineEdit( this );
+  mainLayout->addWidget( label, 1, 0 );
+  mainLayout->addWidget( mHostEdit, 1, 1 );
+
+  label = new TQLabel( i18n( "Password:" ), this );
+  mPasswordEdit = new KLineEdit( this );
+  mPasswordEdit->setEchoMode( TQLineEdit::Password );
+  mainLayout->addWidget( label, 2, 0 );
+  mainLayout->addWidget( mPasswordEdit, 2, 1 );
+}
+
+void ResourceExampleConfig::loadSettings( KRES::Resource *resource )
+{
+  ResourceExample *res = dynamic_cast<ResourceExample *>( resource );
+  if ( res ) {
+    mHostEdit->setText( res->host() );
+    mPasswordEdit->setText( res->password() );
+  } else
+    kdDebug() << "ERROR: ResourceExampleConfig::loadSettings(): no ResourceExample, cast failed" << endl;
+}
+
+void ResourceExampleConfig::saveSettings( KRES::Resource *resource )
+{
+  ResourceExample *res = dynamic_cast<ResourceExample *>( resource );
+  if ( res ) {
+    res->setHost( mHostEdit->text() );
+    res->setPassword( mPasswordEdit->text() );
+  } else
+    kdDebug() << "ERROR: ResourceExampleConfig::saveSettings(): no ResourceExample, cast failed" << endl;
+}
+\endcode
+
+  <B>resourceexample.desktop</B>:
+\code
+[Desktop Entry]
+Type=Service
+
+[Misc]
+Encoding=UTF-8
+Name=Example Resource
+
+[Plugin]
+Type=exchange
+X-TDE-Library=resourceexample
+\endcode
+
+  <B>Makefile.am</B>
+\code
+kde_module_LTLIBRARIES = resourceexample.la
+
+resourceexample_la_SOURCES = resourceexample.cpp resourceexampleconfig.cpp
+resourceexample_la_LDFLAGS = $(all_libraries) -module $(KDE_PLUGIN)
+resourceexample_la_LIBADD = -ltderesources
+
+servicedir = $(kde_datadir)/resources/example
+service_DATA = resourceexample.desktop
+\endcode
+
+*/
+
+/**
+  This class provides a resource which is managed in a general way.
+  
+  A Resource represents the concept of an object with the following attributes:
+
+  - Applications operate on sets of one or more Resource objects.
+  - Creation and deletetion of Resource objects is done in a general way,
+    independent of concrete functionality of the Resource.
+  - The end user has control over creation, deletion and configuration of
+    Resource object.
+  - Properties, behaviour and configuration of different Resource objects can
+    widely differ.
+  - Resources can be active or inactive.
+  - There is one special Resource which is the standard Resource. This can for
+    example be used as default destination for newly created object managed
+    by a certain Resource family.
+  - Activation of Resources can be covered by a two step process of being opened
+    and then loaded. Deactivation corresponds to saving and closing.
+  - Different application ususally share the same set of Resources.
+
+  The Resource base class provides the management functionality. Classes
+  inheriting from Resource automatically appear in the general tderesources
+  kcontrol module.
+
+  Concrete functionality of Resources is specified per family by a subclass of
+  Resource. This classes in turn have subclasses which implement the different
+  flavours of the functionality represented by the family.
+ 
+  A subclass should reimplement at least the constructor and the
+  writeConfig method.
+
+  An example for a Resource subclass hierarchy would be the "calendar" family.
+  The ResourceCalendar subclass would specify an API for accessing calendar
+  data. Subclasses of ResourceCalendar would implement this API for local files,
+  remote files, specific calendar servers etc.
+*/
+class TDERESOURCES_EXPORT Resource : public TQObject
+{
+    friend class Factory;
+    friend class ManagerImpl;
+
+    Q_OBJECT
+  public:
+    typedef TQValueList<Resource *> List;
+
+    /**
+     * Constructor. Construct resource from config.
+     * @param config Configuration to read persistence information from.
+     *               If config is 0, create object using default settings.
+     */
+    Resource( const TDEConfig *config );
+
+    /**
+     * Destructor.
+     */
+    virtual ~Resource();
+
+    /**
+     * Write configuration information for this resource to a configuration
+     * file. If you override this method, remember to call Resource::writeConfig
+     * or Terrible Things(TM) will happen.
+     * @param config Configuration to write persistence information to.
+     */
+    virtual void writeConfig( TDEConfig *config );
+
+    /**
+     * Open this resource, if it not already open. Increase the open
+     * count of this object, and open the resource by calling doOpen().
+     * This method may block while another thread is concurrently opening
+     * or closing the resource.
+     *
+     * Returns true if the resource was already opened or if it was opened
+     * successfully; returns false if the resource was not opened successfully.
+     */
+    bool open();
+
+    /**
+     * Decrease the open count of this object, and if the count reaches
+     * zero, close this resource by calling doClose().
+     * This method may block while another thread is concurrently closing
+     * or opening the resource.
+     */
+    void close();
+
+    /**
+     * Returns whether the resource is open or not.
+     */
+    bool isOpen() const;
+
+    /**
+     * Returns a unique identifier. The identifier is unique for this resource.
+     * It is created when the resource is first created, and it is retained
+     * in the resource family configuration file for this resource.
+     * @return This resource's identifier
+     */
+    TQString identifier() const;
+
+    /**
+     * Returns the type of this resource.
+     */
+    TQString type() const;
+
+    /**
+     * Mark the resource as read-only. You can override this method,
+     * but also remember to call Resource::setReadOnly().
+     */
+    virtual void setReadOnly( bool value );
+
+    /**
+     * Returns, if the resource is read-only.
+     */
+    virtual bool readOnly() const;
+
+    /**
+     * Set the name of resource. You can override this method,
+     * but also remember to call Resource::setResourceName().
+     */
+    virtual void setResourceName( const TQString &name );
+
+    /**
+     * Returns the name of resource.
+     */
+    virtual TQString resourceName() const;
+
+    /**
+      Sets, if the resource is active.
+    */
+    void setActive( bool active );
+
+    /**
+      Return true, if the resource is active.
+    */
+    bool isActive() const;
+
+    /**
+      Print resource information as debug output.
+    */
+    virtual void dump() const;
+
+  protected:
+    /**
+     * Open this resource. When called, the resource must be in
+     * a closed state.
+     *
+     * Returns true if the resource was opened successfully;
+     * returns false if the resource was not opened successfully.
+     *
+     * The result of this call can be accessed later by isOpen()
+     */
+    virtual bool doOpen() { return true; }
+
+    /**
+     * Close this resource. Pre-condition: resource is open.
+     * Post-condition: resource is closed.
+     */
+    virtual void doClose() {}
+
+    void setIdentifier( const TQString &identifier );
+    void setType( const TQString &type );
+
+  private:
+    class ResourcePrivate;
+    ResourcePrivate *d;
+};
+
+class TDERESOURCES_EXPORT PluginFactoryBase : public KLibFactory
+{
+  public:
+    virtual Resource *resource( const TDEConfig *config ) = 0;
+
+    virtual ConfigWidget *configWidget( TQWidget *parent ) = 0;
+
+  protected:
+    virtual TQObject* createObject( TQObject *parent, const char *name, const char *className,
+                                   const TQStringList & args)
+    {
+      Q_UNUSED(parent);
+      Q_UNUSED(name);
+      Q_UNUSED(className);
+      Q_UNUSED(args);
+      return 0;
+    }
+};
+
+template<class TR,class TC>
+class PluginFactory : public PluginFactoryBase
+{
+  public:
+    Resource *resource( const TDEConfig *config )
+    {
+      return new TR( config );
+    }
+
+    ConfigWidget *configWidget( TQWidget *parent )
+    {
+      return new TC( parent );
+    }
+};
+
+}
+
+#endif