added for plugins own dir

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@1850 b45a01b8-16f6-495d-af2f-9b41ad6348cc

plugins/PluginInterface.h

@@ -0,0 +1,51 @@
+#ifndef _PLUGIN_INTERFACE_H_
+#define _PLUGIN_INTERFACE_H_
+
+#include <QtPlugin>
+
+#include <QString>
+/***
+QT_BEGIN_NAMESPACE
+class QString;
+class QWidget;
+QT_END_NAMESPACE
+***/
+
+//! a base class for plugins
+
+//! All plugin classes must inherite this class and QObject. 
+class PluginInterface
+{
+public:
+    virtual ~PluginInterface() {}
+
+public slots:
+    //! A description of the plugin
+
+    //! A description of the plugin. Is not used in current version. 
+    virtual QString pluginDescription() const = 0;
+
+    //! The plugin's name
+
+    //! A name serves like an unique ID. The name is used in all operations
+    //! such as installing, removing, receiving a widget
+    virtual QString pluginName() const = 0;
+
+    //! plugin's widget.
+
+    //! Returns the widget, which is actually a plugin. Main application must
+    //! delete the widget; usually, a parent widget does it. If you want to use
+    //! the widget  as top-level (i.e. parent==0), please, set
+    //! Qt::WA_DeleteOnClose  flag .
+    virtual QWidget* pluginWidget(QWidget * parent = 0) = 0;
+};
+
+QT_BEGIN_NAMESPACE
+
+Q_DECLARE_INTERFACE(PluginInterface,
+                    "com.beardog.retroshare.PluginInterface/1.0")
+
+QT_END_NAMESPACE
+
+#endif
+