Refs #11040 Added drag and drop feature for peaks workspace in vsi

Code/Mantid/Vates/VatesSimpleGui/ViewWidgets/inc/MantidVatesSimpleGuiViewWidgets/MdViewerWidget.h

@@ -15,6 +15,8 @@ class pqPipelineSource;
 class pqViewSettingsReaction;
 class vtkSMDoubleVectorProperty;
 
+class QDragEnterEvent;
+class QDropEvent;
 class QAction;
 class QEvent;
 class QHBoxLayout;
@@ -109,7 +111,10 @@ protected slots:
   /// Handle workspace replacement tasks.
   void afterReplaceHandle(const std::string &wsName,
                           const boost::shared_ptr<Mantid::API::Workspace> ws);
-
+  /// Detects if something is dragged onto the VSI
+  void dragEnterEvent(QDragEnterEvent *e);
+ /// Reacts to something being dropped onto the VSI
+ void dropEvent(QDropEvent *e);
 private:
   Q_DISABLE_COPY(MdViewerWidget)
 
@@ -177,6 +182,8 @@ protected slots:
   void resetCurrentView(int workspaceType, const std::string& instrumentName);
   /// Set visibility listener
   void setVisibilityListener();
+  /// Handle drag and drop of peaks workspcaes
+  void handleDragAndDropPeaksWorkspaces(QEvent* e, QString text, QStringList& wsNames);
 };
 
 } // SimpleGui

Code/Mantid/Vates/VatesSimpleGui/ViewWidgets/src/MdViewerWidget.cpp

@@ -11,6 +11,7 @@
 #include "MantidVatesSimpleGuiViewWidgets/TimeControlWidget.h"
 
 #include "MantidQtAPI/InterfaceManager.h"
+#include "MantidAPI/IPeaksWorkspace.h"
 #include "MantidKernel/DynamicFactory.h"
 #include "MantidKernel/Logger.h"
 #include "MantidKernel/ConfigService.h"
@@ -84,6 +85,8 @@
 
 #include <QAction>
 #include <QDesktopServices>
+#include <QDragEnterEvent>
+#include <QDropEvent>
 #include <QHBoxLayout>
 #include <QMainWindow>
 #include <QMenuBar>
@@ -96,6 +99,7 @@
 #include <set>
 #include <string>
 #include <boost/regex.hpp>
+#include <boost/shared_ptr.hpp>
 
 namespace Mantid
 {
@@ -127,8 +131,7 @@ MdViewerWidget::MdViewerWidget() : VatesViewerInterface(), currentView(NULL),
 
   this->internalSetup(true);
 
-  // Create the mapping from the measurement technique to the view
-
+  setAcceptDrops(true);
 }
 
 /**
@@ -1144,6 +1147,71 @@ void MdViewerWidget::setVisibilityListener()
   }
 }
 
+/**
+ * Dectect when a PeaksWorkspace is dragged into the VSI.
+ * @param A drag event.
+ */
+void MdViewerWidget::dragEnterEvent(QDragEnterEvent *e) {
+  QString name = e->mimeData()->objectName();
+  if (name == "MantidWorkspace") {
+  QString text = e->mimeData()->text();
+  QStringList wsNames;
+  handleDragAndDropPeaksWorkspaces(e,text, wsNames);
+  }
+  else {
+  e->ignore();
+  }
+}
+
+/**
+ * React to dropping a PeaksWorkspace ontot the VSI.
+ * @param e A drop event.
+ */
+void MdViewerWidget::dropEvent(QDropEvent *e) {
+  QString name = e->mimeData()->objectName();
+  if (name == "MantidWorkspace") {
+    QString text = e->mimeData()->text();
+    QStringList wsNames;
+    handleDragAndDropPeaksWorkspaces(e,text, wsNames);
+    if(!wsNames.empty()){
+    // We render the first workspace name, it is a peak workspace and the instrument is not relevant
+    renderWorkspace(wsNames[0], 1, "");
+    }
+  }
+}
+
+/**
+  * Handle the drag and drop events of peaks workspaces.
+  * @param e The event.
+  * @param text String containing information regarding the workspace name.
+  * @param wsNames A reference to a list of workspaces names, which are being extracted.
+  */
+ void MdViewerWidget::handleDragAndDropPeaksWorkspaces(QEvent* e, QString text, QStringList& wsNames)
+ {
+  int endIndex = 0;
+  while (text.indexOf("[\"", endIndex) > -1) {
+    int startIndex = text.indexOf("[\"", endIndex) + 2;
+    endIndex = text.indexOf("\"]", startIndex);
+    QString candidate = text.mid(startIndex, endIndex - startIndex);
+    if(dynamic_cast<SplatterPlotView *>(this->currentView))
+    {
+      if(boost::dynamic_pointer_cast<IPeaksWorkspace>(AnalysisDataService::Instance().retrieve(candidate.toStdString())))
+      {
+      wsNames.append(candidate);
+      e->accept();
+      }
+      else
+      {
+      e->ignore();
+      }
+    }
+    else
+    {
+      e->ignore();
+    }
+  }
+}
+
 
 } // namespace SimpleGui
 } // namespace Vates