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diff --git a/kontact/interfaces/plugin.h b/kontact/interfaces/plugin.h
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+/*
+   This file is part of KDE Kontact.
+
+   Copyright (c) 2001 Matthias Hoelzer-Kluepfel <mhk@kde.org>
+   Copyright (c) 2002-2003 Daniel Molkentin <molkentin@kde.org>
+   Copyright (c) 2003 Cornelius Schumacher <schumacher@kde.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 KONTACT_PLUGIN_H
+#define KONTACT_PLUGIN_H
+
+#include <qobject.h>
+#include <kxmlguiclient.h>
+#include <kdepimmacros.h>
+#include <qptrlist.h>
+
+class QStringList;
+class DCOPClient;
+class DCOPObject;
+class KAboutData;
+class KAction;
+class KConfig;
+class QWidget;
+namespace KParts { class ReadOnlyPart; }
+
+/**
+  Increase this version number whenever you make a change
+  in the API.
+ */
+#define KONTACT_PLUGIN_VERSION 6
+
+namespace Kontact
+{
+
+class Core;
+class Summary;
+
+/**
+  Base class for all Plugins in Kontact. Inherit from it
+  to get a plugin. It can insert an icon into the sidepane,
+  add widgets to the widgetstack and add menu items via XMLGUI.
+ */
+class KDE_EXPORT Plugin : public QObject, virtual public KXMLGUIClient
+{
+  Q_OBJECT
+
+  public:
+    /**
+      Creates a new Plugin, note that name parameter name is required if
+      you want your plugin to do dcop via it's own instance of
+      DCOPClient by calling dcopClient.
+      @note name MUST be the name of the application that
+      provides the part! This is the name used for DCOP registration.
+      It's ok to have several plugins using the same application name.
+    */
+    Plugin( Core *core, QObject *parent, const char *name );
+
+    ~Plugin();
+
+    /**
+      Sets the identifier.
+    */
+    void setIdentifier( const QString &identifier );
+
+    /**
+      Returns the identifier. It is used as argument for several
+      methods of Kontacts core.
+    */
+    QString identifier() const;
+
+    /**
+      Sets the localized title.
+     */
+    void setTitle( const QString &title );
+
+    /**
+      Returns the localized title.
+    */
+    QString title() const;
+
+    /**
+      Sets the icon name.
+    */
+    void setIcon( const QString &icon );
+
+    /**
+      Returns the icon name.
+    */
+    QString icon() const;
+
+    /**
+      Sets the name of executable (if existant).
+    */
+    void setExecutableName( const QString &bin );
+
+    /**
+      Returns the name of the binary (if existant).
+    */
+    QString executableName() const;
+
+    /**
+      Set name of library which contains the KPart used by this plugin.
+    */
+    void setPartLibraryName( const QCString & );
+
+    /**
+      Create the DCOP interface for the given @p serviceType, if this
+      plugin provides it. Return false otherwise.
+    */
+    virtual bool createDCOPInterface( const QString& /*serviceType*/ ) { return false; }
+
+    /**
+      Reimplement this method and return wether a standalone application is still running
+      This is only required if your part is also available as standalone application.
+    */
+    virtual bool isRunningStandalone() { return false; }
+
+    /**
+      Reimplement this method if your application needs a different approach to be brought
+      in the foreground. The default behaviour is calling the binary.
+      This is only required if your part is also available as standalone application.
+    */
+    virtual void bringToForeground();
+
+    /**
+      Reimplement this method if you want to add your credits to the Kontact
+      about dialog.
+    */
+    virtual const KAboutData *aboutData();
+
+    /**
+      You can use this method if you need to access the current part. You can be
+      sure that you always get the same pointer as long as the part has not been
+      deleted.
+    */
+    KParts::ReadOnlyPart *part();
+
+     /**
+       Reimplement this method and return the a path relative to "data" to the tips file.
+     */
+    virtual QString tipFile() const;
+
+    /**
+      This function is called when the plugin is selected by the user before the
+      widget of the KPart belonging to the plugin is raised.
+    */
+    virtual void select();
+
+    /**
+      This function is called whenever the config dialog has been closed
+      successfully.
+     */
+    virtual void configUpdated();
+
+    /**
+      Reimplement this method if you want to add a widget for your application
+      to Kontact's summary page.
+    */
+    virtual Summary *createSummaryWidget( QWidget * /*parent*/ ) { return 0; }
+
+    /**
+      Returns wether the plugin provides a part that should be shown in the sidebar.
+    */
+    virtual bool showInSideBar() const;
+
+    /**
+      Set if the plugin provides a part that should be shown in the sidebar.
+    */
+    void setShowInSideBar( bool hasPart );
+
+    /**
+      Reimplement this method if you want to add checks before closing down the main kontact
+      window.  Return true if it's OK to close the window.  If any loaded plugin returns false
+      from this method, then the main kontact window will not close.
+    */
+    virtual bool queryClose() const { return true; }
+
+    /**
+      Retrieve the current DCOP Client for the plugin.
+
+      The clients name is taken from the name argument in the constructor.
+      @note: The DCOPClient object will only be created when this method is
+      called for the first time. Make sure that the part has been loaded
+      before calling this method, if it's the one that contains the DCOP
+      interface that other parts might use.
+    */
+    DCOPClient *dcopClient() const;
+
+    /**
+      Return the weight of the plugin. The higher the weight the lower it will
+      be displayed in the sidebar. The default implementation returns 0.
+    */
+    virtual int weight() const { return 0; }
+
+    /**
+      Insert "New" action.
+    */
+    void insertNewAction( KAction *action );
+
+    /**
+      Insert "Sync" action.
+    */
+    void insertSyncAction( KAction *action );
+
+    /**
+      FIXME: write API doc for Kontact::Plugin::newActions().
+    */
+    QPtrList<KAction>* newActions() const;
+
+    /**
+      FIXME: write API doc for Kontact::Plugin::syncActions().
+    */
+    QPtrList<KAction>* syncActions() const;
+
+    /**
+      Returns a list of action name which shall be hidden in the main toolbar.
+     */
+    virtual QStringList invisibleToolbarActions() const { return QStringList(); }
+
+    /**
+      Return, if the plugin can handle the drag object of the given mime type.
+    */
+    virtual bool canDecodeDrag( QMimeSource * ) { return false; }
+
+    /**
+      Process drop event.
+    */
+    virtual void processDropEvent( QDropEvent * ) {}
+
+    virtual void loadProfile( const QString& directoryPath );
+
+    virtual void saveToProfile( const QString& directoryPath ) const;
+
+    /**
+     * Session management: read properties
+     */
+    virtual void readProperties( KConfig * ) {}
+
+    /**
+     * Session management: save properties
+     */
+    virtual void saveProperties( KConfig * ) {}
+
+    Core *core() const;
+
+    bool disabled() const;
+    void setDisabled( bool v );
+
+  public slots:
+    /**
+      internal usage
+     */
+    void slotConfigUpdated();
+
+  protected:
+    /**
+      Reimplement and return the part here. Reimplementing createPart() is
+      mandatory!
+    */
+    virtual KParts::ReadOnlyPart *createPart() = 0;
+
+    KParts::ReadOnlyPart *loadPart();
+
+    virtual void virtual_hook(  int id, void* data );
+
+  private slots:
+    void partDestroyed();
+
+  private:
+    class Private;
+    Private *d;
+};
+
+}
+
+#endif