Added support for dragging/dropping resources; you can use drag/drop to rearrange resources/folders in the resource browser now, and you can drag/drop resources onto resource selector widgets

src/Editor/Undo/CMoveResourceCommand.h

@@ -0,0 +1,45 @@
+#ifndef CMOVERESOURCECOMMAND_H
+#define CMOVERESOURCECOMMAND_H
+
+#include "IUndoCommand.h"
+#include "Editor/CEditorApplication.h"
+#include <Core/GameProject/CResourceEntry.h>
+
+class CMoveResourceCommand : public IUndoCommand
+{
+    CResourceEntry *mpEntry;
+    TString mOldDirPath;
+    TString mNewDirPath;
+    bool mOldDirAutoGenerated;
+
+public:
+    CMoveResourceCommand(CResourceEntry *pEntry, CVirtualDirectory *pNewDir)
+        : IUndoCommand("Move Resource")
+        , mpEntry(pEntry)
+        , mOldDirPath(pEntry->DirectoryPath())
+        , mNewDirPath(pNewDir->FullPath())
+        , mOldDirAutoGenerated(pEntry->HasFlag(eREF_AutoResDir))
+    {}
+
+    void undo()
+    {
+        bool Success = mpEntry->Move(mOldDirPath, mOldDirAutoGenerated);
+        ASSERT(Success); // todo better error handling
+        gpEdApp->ResourceRenamed(mpEntry);
+    }
+
+    void redo()
+    {
+        // note: it doesn't matter if the new directory was auto-generated, since the
+        // purpose of tracking that flag is to detect which resources have been auto-categorized.
+        // if this is being called, even if the new directory is auto-generated, it means the
+        // user is intentionally placing it here, so it should be treated as a custom directory
+        bool Success = mpEntry->Move(mNewDirPath);
+        ASSERT(Success); // todo better error handling
+        gpEdApp->ResourceRenamed(mpEntry);
+    }
+
+    bool AffectsCleanState() const { return false; }
+};
+
+#endif // CMOVERESOURCECOMMAND_H