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/**
* @file lldragdrop32.cpp
* @brief Handler for Windows specific drag and drop (OS to client) code
*
* $LicenseInfo:firstyear=2001&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#if LL_WINDOWS
#if LL_OS_DRAGDROP_ENABLED
#include "linden_common.h"
#include "llwindowwin32.h"
#include "llkeyboardwin32.h"
#include "llwindowcallbacks.h"
#include "lldragdropwin32.h"
class LLDragDropWin32Target:
public IDropTarget
{
public:
////////////////////////////////////////////////////////////////////////////////
//
LLDragDropWin32Target( HWND hWnd ) :
mRefCount( 1 ),
mAppWindowHandle( hWnd ),
mAllowDrop(false),
mIsSlurl(false)
{
};
virtual ~LLDragDropWin32Target()
{
};
////////////////////////////////////////////////////////////////////////////////
//
ULONG __stdcall AddRef( void )
{
return InterlockedIncrement( &mRefCount );
};
////////////////////////////////////////////////////////////////////////////////
//
ULONG __stdcall Release( void )
{
LONG count = InterlockedDecrement( &mRefCount );
if ( count == 0 )
{
delete this;
return 0;
}
else
{
return count;
};
};
////////////////////////////////////////////////////////////////////////////////
//
HRESULT __stdcall QueryInterface( REFIID iid, void** ppvObject )
{
if ( iid == IID_IUnknown || iid == IID_IDropTarget )
{
AddRef();
*ppvObject = this;
return S_OK;
}
else
{
*ppvObject = 0;
return E_NOINTERFACE;
};
};
////////////////////////////////////////////////////////////////////////////////
//
HRESULT __stdcall DragEnter( IDataObject* pDataObject, DWORD grfKeyState, POINTL pt, DWORD* pdwEffect )
{
FORMATETC fmtetc = { CF_TEXT, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL };
// support CF_TEXT using a HGLOBAL?
if ( S_OK == pDataObject->QueryGetData( &fmtetc ) )
{
mAllowDrop = true;
mDropUrl = std::string();
mIsSlurl = false;
STGMEDIUM stgmed;
if( S_OK == pDataObject->GetData( &fmtetc, &stgmed ) )
{
PVOID data = GlobalLock( stgmed.hGlobal );
mDropUrl = std::string( (char*)data );
// XXX MAJOR MAJOR HACK!
LLWindowWin32 *window_imp = (LLWindowWin32 *)GetWindowLong(mAppWindowHandle, GWL_USERDATA);
if (NULL != window_imp)
{
LLCoordGL gl_coord( 0, 0 );
POINT pt2;
pt2.x = pt.x;
pt2.y = pt.y;
ScreenToClient( mAppWindowHandle, &pt2 );
LLCoordWindow cursor_coord_window( pt2.x, pt2.y );
MASK mask = gKeyboard->currentMask(TRUE);
LLWindowCallbacks::DragNDropResult result = window_imp->completeDragNDropRequest( cursor_coord_window.convert(), mask,
LLWindowCallbacks::DNDA_START_TRACKING, mDropUrl );
switch (result)
{
case LLWindowCallbacks::DND_COPY:
*pdwEffect = DROPEFFECT_COPY;
break;
case LLWindowCallbacks::DND_LINK:
*pdwEffect = DROPEFFECT_LINK;
break;
case LLWindowCallbacks::DND_MOVE:
*pdwEffect = DROPEFFECT_MOVE;
break;
case LLWindowCallbacks::DND_NONE:
default:
*pdwEffect = DROPEFFECT_NONE;
break;
}
};
GlobalUnlock( stgmed.hGlobal );
ReleaseStgMedium( &stgmed );
};
SetFocus( mAppWindowHandle );
}
else
{
mAllowDrop = false;
*pdwEffect = DROPEFFECT_NONE;
};
return S_OK;
};
////////////////////////////////////////////////////////////////////////////////
//
HRESULT __stdcall DragOver( DWORD grfKeyState, POINTL pt, DWORD* pdwEffect )
{
if ( mAllowDrop )
{
// XXX MAJOR MAJOR HACK!
LLWindowWin32 *window_imp = (LLWindowWin32 *)GetWindowLong(mAppWindowHandle, GWL_USERDATA);
if (NULL != window_imp)
{
LLCoordGL gl_coord( 0, 0 );
POINT pt2;
pt2.x = pt.x;
pt2.y = pt.y;
ScreenToClient( mAppWindowHandle, &pt2 );
LLCoordWindow cursor_coord_window( pt2.x, pt2.y );
MASK mask = gKeyboard->currentMask(TRUE);
LLWindowCallbacks::DragNDropResult result = window_imp->completeDragNDropRequest( cursor_coord_window.convert(), mask,
LLWindowCallbacks::DNDA_TRACK, mDropUrl );
switch (result)
{
case LLWindowCallbacks::DND_COPY:
*pdwEffect = DROPEFFECT_COPY;
break;
case LLWindowCallbacks::DND_LINK:
*pdwEffect = DROPEFFECT_LINK;
break;
case LLWindowCallbacks::DND_MOVE:
*pdwEffect = DROPEFFECT_MOVE;
break;
case LLWindowCallbacks::DND_NONE:
default:
*pdwEffect = DROPEFFECT_NONE;
break;
}
};
}
else
{
*pdwEffect = DROPEFFECT_NONE;
};
return S_OK;
};
////////////////////////////////////////////////////////////////////////////////
//
HRESULT __stdcall DragLeave( void )
{
// XXX MAJOR MAJOR HACK!
LLWindowWin32 *window_imp = (LLWindowWin32 *)GetWindowLong(mAppWindowHandle, GWL_USERDATA);
if (NULL != window_imp)
{
LLCoordGL gl_coord( 0, 0 );
MASK mask = gKeyboard->currentMask(TRUE);
window_imp->completeDragNDropRequest( gl_coord, mask, LLWindowCallbacks::DNDA_STOP_TRACKING, mDropUrl );
};
return S_OK;
};
////////////////////////////////////////////////////////////////////////////////
//
HRESULT __stdcall Drop( IDataObject* pDataObject, DWORD grfKeyState, POINTL pt, DWORD* pdwEffect )
{
if ( mAllowDrop )
{
// window impl stored in Window data (neat!)
LLWindowWin32 *window_imp = (LLWindowWin32 *)GetWindowLong( mAppWindowHandle, GWL_USERDATA );
if ( NULL != window_imp )
{
POINT pt_client;
pt_client.x = pt.x;
pt_client.y = pt.y;
ScreenToClient( mAppWindowHandle, &pt_client );
LLCoordWindow cursor_coord_window( pt_client.x, pt_client.y );
LLCoordGL gl_coord(cursor_coord_window.convert());
llinfos << "### (Drop) URL is: " << mDropUrl << llendl;
llinfos << "### raw coords are: " << pt.x << " x " << pt.y << llendl;
llinfos << "### client coords are: " << pt_client.x << " x " << pt_client.y << llendl;
llinfos << "### GL coords are: " << gl_coord.mX << " x " << gl_coord.mY << llendl;
llinfos << llendl;
// no keyboard modifier option yet but we could one day
MASK mask = gKeyboard->currentMask( TRUE );
// actually do the drop
LLWindowCallbacks::DragNDropResult result = window_imp->completeDragNDropRequest( gl_coord, mask,
LLWindowCallbacks::DNDA_DROPPED, mDropUrl );
switch (result)
{
case LLWindowCallbacks::DND_COPY:
*pdwEffect = DROPEFFECT_COPY;
break;
case LLWindowCallbacks::DND_LINK:
*pdwEffect = DROPEFFECT_LINK;
break;
case LLWindowCallbacks::DND_MOVE:
*pdwEffect = DROPEFFECT_MOVE;
break;
case LLWindowCallbacks::DND_NONE:
default:
*pdwEffect = DROPEFFECT_NONE;
break;
}
};
}
else
{
*pdwEffect = DROPEFFECT_NONE;
};
return S_OK;
};
////////////////////////////////////////////////////////////////////////////////
//
private:
LONG mRefCount;
HWND mAppWindowHandle;
bool mAllowDrop;
std::string mDropUrl;
bool mIsSlurl;
friend class LLWindowWin32;
};
////////////////////////////////////////////////////////////////////////////////
//
LLDragDropWin32::LLDragDropWin32() :
mDropTarget( NULL ),
mDropWindowHandle( NULL )
{
}
////////////////////////////////////////////////////////////////////////////////
//
LLDragDropWin32::~LLDragDropWin32()
{
}
////////////////////////////////////////////////////////////////////////////////
//
bool LLDragDropWin32::init( HWND hWnd )
{
if ( NOERROR != OleInitialize( NULL ) )
return FALSE;
mDropTarget = new LLDragDropWin32Target( hWnd );
if ( mDropTarget )
{
HRESULT result = CoLockObjectExternal( mDropTarget, TRUE, FALSE );
if ( S_OK == result )
{
result = RegisterDragDrop( hWnd, mDropTarget );
if ( S_OK != result )
{
// RegisterDragDrop failed
return false;
};
// all ok
mDropWindowHandle = hWnd;
}
else
{
// Unable to lock OLE object
return false;
};
};
// success
return true;
}
////////////////////////////////////////////////////////////////////////////////
//
void LLDragDropWin32::reset()
{
if ( mDropTarget )
{
RevokeDragDrop( mDropWindowHandle );
CoLockObjectExternal( mDropTarget, FALSE, TRUE );
mDropTarget->Release();
};
OleUninitialize();
}
#endif // LL_OS_DRAGDROP_ENABLED
#endif // LL_WINDOWS
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