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Lts/Common/LtsWidgets/lts_drop_handler.h

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+/**
+**
+** @RDE_HEADER@
+** Virtual base class of a simple drop handler.
+** $Id$
+** $HeadURL$
+** $Author$
+**
+** -----------------------------------------------------------------------------------------------
+**
+** Hardware-Environment: Intel-PC
+** Software-Environment: Windows 7, Linux, Qt 5.4. ArcGIS 10.2.5
+**
+** Language ........: C++ 11
+**
+** -----------------------------------------------------------------------------------------------
+**
+** Author ...........: Jörg Turla, SPD G, Tel. 3132
+**
+** -----------------------------------------------------------------------------------------------
+**
+** Notes .........:
+**
+**   18.12.2015, JT  : First edition for use with Qt5
+**
+** -----------------------------------------------------------------------------------------------
+*/
+
+#pragma once
+
+
+class QMimeData;
+
+
+namespace LtsWidgets
+{
+  /**
+    @class LtsDropHandler pdrophandler.h
+    @brief Interface class to handle drop events of special mime data type.
+    @see SituationMap::Map, SituationMap::DropEventManager
+
+    The LtsDropHandler class is an interface class to handle drop event for one type of mime data. It is used from DropEventManager to process drop events.
+    The DropEventManager will call the doDrop function to process events. The doDrop fuction has to be implemented in derived class.
+
+    Following example shows how to implement a drop handler.
+
+    @code
+   
+       #include <pwidgets/pdrophandler.h>
+   
+       class DropCreatePolyLine : public LtsWidgets::LtsDropHandler
+        {
+           PlanEditor               * m_planEditor;
+           PlanEditor::InternalData * m_planEditorInternal;
+           bool                       m_smooth;
+
+           public:
+
+             DropCreatePolyLine( PlanEditor               * planEditor
+                               , PlanEditor::InternalData * planEditorInternal
+                               , bool                       smooth = false ) 
+               : LtsWidgets::LtsDropHandler()
+               , m_planEditor(planEditor)
+               , m_planEditorInternal(planEditorInternal)
+               , m_smooth(smooth)                           {;}
+
+             virtual ~DropCreatePolyLine() = default;
+
+             void doDrop( int x, int y, const QMimeData * mimeData = nullptr) const override;
+
+        }; // DropCreatePolyLine
+  
+  
+        void PlanEditor::installLineDropHandler( LtsWidgets::LtsDragIcon * dragIcon )
+        {
+           qulonglong key = m_dropEventManager->add(new DropCreatePolyLine(this,m_internal));
+           dragIcon->setDropHandlerKey( key );
+        } // PlanEditor::installLineDropHandler( LtsWidgets::LtsDragIcon * dragIcon )
+  
+
+        void DropCreatePolyLine::doDrop( int x, int y, const QMimeData * mimeData ) const
+        {
+          SituationMap::Map                             * map;
+          SituationMap::RB::RubberbandMultiPointFeature * rubberband;
+          SituationMap::RB::RubberbandFactory           & rbFactory;
+    
+          map       = m_planEditorInternal->m_map;
+          rbFactory = map->rubberbandFactory();
+     
+          if (m_smooth) rubberband = rbFactory.create<SituationMap::RB::RubberbandSmoothLine>();
+          else          rubberband = rbFactory.create<SituationMap::RB::RubberbandMultiPointFeature>();
+
+          if (rubberband != nullptr)
+          {
+            rubberband -> setAutoDelete( true );
+            rubberband -> enableClosed( false );
+
+            uint dx = map->width()  * 0.25;
+            uint dy = map->height() * 0.25;
+
+            QVector<QPointF> lineCoordinates;
+
+            lineCoordinates += map->viewPortWindowPointToGeoCoordinate(QPoint(x-dx,y-dy));
+            lineCoordinates += map->viewPortWindowPointToGeoCoordinate(QPoint(x+dx,y+dy));
+
+            rubberband->setCoordinateVector( lineCoordinates );
+
+            QObject::connect( rubberband  , &SituationMap::RB::Rubberband::apply
+                            , m_planEditor, &PlanEditor::onPolylineCreate        );
+            QObject::connect( rubberband  , &SituationMap::RB::Rubberband::abort
+                            , m_planEditor, &PlanEditor::onRubberbandAbort       );
+
+          } // DropCreatePolyLine::doDrop( int x, int y )
+
+  } // DropCreatePolyLine::doDrop( int x, int y ) const
+ 
+    @endcode
+  */
+  class LtsDropHandler
+  {
+    public:
+
+      LtsDropHandler() = default;
+      virtual ~LtsDropHandler() = default;
+
+      LtsDropHandler( const LtsDropHandler & )               = delete;
+      LtsDropHandler & operator = ( const LtsDropHandler & ) = delete;
+
+      /**
+        Function to process drop events.
+
+        @param x        x coordinate of cursor position referred to widget pixel coordinates.
+        @param y        y coordinate of cursor position referred to widget pixel coordinates.
+        @param mimeData Pointer to data to be dropped.
+      */
+      virtual void doDrop( int x, int y,  const QMimeData * mimeData ) const = 0;
+
+  }; // class LtsDropHandler
+
+
+} // namespace LtsWidgets