From 256545205226c44320eb813397bd23021f0e8a31 Mon Sep 17 00:00:00 2001
From: Stanislav Bas <stanislav.m.bas@gmail.com>
Date: Sun, 21 Jun 2015 17:08:10 +0300
Subject: [PATCH] Add some drag'n'drop utils to work with TableMimeData

---
 apps/opencs/CMakeLists.txt               |  2 +-
 apps/opencs/view/world/dragdroputils.cpp | 26 ++++++++++++++++++++
 apps/opencs/view/world/dragdroputils.hpp | 30 ++++++++++++++++++++++++
 3 files changed, 57 insertions(+), 1 deletion(-)
 create mode 100644 apps/opencs/view/world/dragdroputils.cpp
 create mode 100644 apps/opencs/view/world/dragdroputils.hpp

diff --git a/apps/opencs/CMakeLists.txt b/apps/opencs/CMakeLists.txt
index fa703e4972..5386da707f 100644
--- a/apps/opencs/CMakeLists.txt
+++ b/apps/opencs/CMakeLists.txt
@@ -70,7 +70,7 @@ opencs_units (view/world
 opencs_units_noqt (view/world
     subviews enumdelegate vartypedelegate recordstatusdelegate idtypedelegate datadisplaydelegate
     scripthighlighter idvalidator dialoguecreator physicssystem idcompletiondelegate
-    colordelegate
+    colordelegate dragdroputils
     )
 
 opencs_units (view/widget
diff --git a/apps/opencs/view/world/dragdroputils.cpp b/apps/opencs/view/world/dragdroputils.cpp
new file mode 100644
index 0000000000..7f3974e539
--- /dev/null
+++ b/apps/opencs/view/world/dragdroputils.cpp
@@ -0,0 +1,26 @@
+#include "dragdroputils.hpp"
+
+#include <QDropEvent>
+
+#include "../../model/world/tablemimedata.hpp"
+
+const CSMWorld::TableMimeData *CSVWorld::DragDropUtils::getTableMimeData(const QDropEvent &event)
+{
+    return dynamic_cast<const CSMWorld::TableMimeData *>(event.mimeData());
+}
+
+bool CSVWorld::DragDropUtils::canAcceptData(const QDropEvent &event, CSMWorld::ColumnBase::Display type)
+{
+    const CSMWorld::TableMimeData *data = getTableMimeData(event);
+    return data != NULL && data->holdsType(type);
+}
+
+CSMWorld::UniversalId CSVWorld::DragDropUtils::getAcceptedData(const QDropEvent &event, 
+                                                               CSMWorld::ColumnBase::Display type)
+{
+    if (canAcceptData(event, type))
+    {
+        return getTableMimeData(event)->returnMatching(type);
+    }
+    return CSMWorld::UniversalId::Type_None;
+}
diff --git a/apps/opencs/view/world/dragdroputils.hpp b/apps/opencs/view/world/dragdroputils.hpp
new file mode 100644
index 0000000000..88e2958a53
--- /dev/null
+++ b/apps/opencs/view/world/dragdroputils.hpp
@@ -0,0 +1,30 @@
+#ifndef CSV_WORLD_DRAGDROPUTILS_HPP
+#define CSV_WORLD_DRAGDROPUTILS_HPP
+
+#include "../../model/world/columnbase.hpp"
+
+class QDropEvent;
+
+namespace CSMWorld
+{
+    class TableMimeData;
+    class UniversalId;
+}
+
+namespace CSVWorld
+{
+    class DragDropUtils
+    {
+        public:
+            static const CSMWorld::TableMimeData *getTableMimeData(const QDropEvent &event);
+
+            static bool canAcceptData(const QDropEvent &event, CSMWorld::ColumnBase::Display type);
+            ///< Checks whether the \a event contains a valid CSMWorld::TableMimeData that holds the \a type
+
+            static CSMWorld::UniversalId getAcceptedData(const QDropEvent &event, CSMWorld::ColumnBase::Display type);
+            ///< Gets the accepted data from the \a event using the \a type
+            ///< \return Type_None if the \a event data doesn't holds the \a type
+    };
+}
+
+#endif