externalDropCallback/externalDropCallback.cpp

//-
// Copyright (C) 2010 Autodesk, Inc.
//
// These coded instructions, statements and computer programs contain
// unpublished information proprietary to Autodesk, Inc. and
// are protected by the Canadian and US federal copyright law. They
// may not be disclosed to third parties or copied or duplicated, in
// whole or in part, without prior written consent of
// Autodesk Inc.
//
// Unpublished-rights reserved under the Copyright Laws of
// the United States.
//+

#include <maya/MIOStream.h>

#include <maya/MExternalDropCallback.h> 
#include <maya/MExternalDropData.h> 
#include <maya/MFnPlugin.h> 
#include <maya/MGlobal.h> 
#include <maya/MStringArray.h> 

class ExampleExternalDropCallback : public MExternalDropCallback
{
    public:
        MExternalDropStatus externalDropCallback( bool doDrop, const MString& controlName, const MExternalDropData& data ) override
        {
            // dump some data to the output window
            //
            std::cout << "externalDropCallback: " << doDrop << ", \"" << controlName << "\"" << std::endl;
            std::cout << "  hasText(): " << data.hasText() << ", \"" << data.text() << "\"" << std::endl;
            MStringArray urls = data.urls();
            std::cout << "  hasUrls(): " << data.hasUrls();
            for ( unsigned int i=0; i<urls.length(); ++i )
                std::cout << ", \"" << urls[i] << "\"";
            std::cout << std::endl;
            MStringArray formats = data.formats();
            std::cout << "  formats(): ";
            for ( unsigned int i=0; i<formats.length(); ++i )
                std::cout << ", \"" << formats[i] << "\"";
            std::cout << std::endl;

            // if the drop has a URL defining a file, and we're dropping onto a shelf,
            // create a new shelf item to open that file
            //
            if ( data.hasUrls() )
            {
                MString cmd;
                int result;
                cmd = "shelfLayout -exists \"" + controlName + "\"";
                MGlobal::executeCommand( cmd, result );
                if ( result )
                {
                    MString url = data.urls()[0];
                    if ( url.substring( 0, 7 ) == "file:///" )
                    {
                        if ( doDrop )
                        {
                            url = url.substring( 8, url.length()-1 );
                            MStringArray bits;
                            url.split( '/', bits );
                            MString name = bits[ bits.length()-1 ];
                            cmd = "scriptToShelf( \"" + name + "\", ";
                            cmd += "\"file -open \\\"" + url + "\\\"\"";
                            cmd += ", true )";
                            MGlobal::executeCommand( cmd );
                        }
                        return kNoMayaDefaultAndAccept;
                    }
                }
            }

            return kMayaDefault;
        }
};

static ExampleExternalDropCallback* theCallback = NULL;

MStatus initializePlugin(MObject obj)
{
    MStatus   status;
    MFnPlugin plugin(obj, PLUGIN_COMPANY, "1.0", "Any");

    // create an instance of our callback object
    //
    theCallback = new ExampleExternalDropCallback;

    // add the callback to the system
    //
    MExternalDropCallback::addCallback( theCallback );

    return status;
}

MStatus uninitializePlugin(MObject obj)
{
    MStatus   status;
    MFnPlugin plugin(obj);

    // remove the callback from the system
    //
    MExternalDropCallback::removeCallback( theCallback );

    // delete the callback object
    //
    delete theCallback;
    theCallback = NULL;

    return status;
}