lldragdropwin32.cpp
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上传日期:2021-03-01
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- /**
- * @file lldragdrop32.cpp
- * @brief Handler for Windows specific drag and drop (OS to client) code
- *
- * $LicenseInfo:firstyear=2001&license=viewergpl$
- *
- * Copyright (c) 2001-2010, Linden Research, Inc.
- *
- * Second Life Viewer Source Code
- * The source code in this file ("Source Code") is provided by Linden Lab
- * to you under the terms of the GNU General Public License, version 2.0
- * ("GPL"), unless you have obtained a separate licensing agreement
- * ("Other License"), formally executed by you and Linden Lab. Terms of
- * the GPL can be found in doc/GPL-license.txt in this distribution, or
- * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
- *
- * There are special exceptions to the terms and conditions of the GPL as
- * it is applied to this Source Code. View the full text of the exception
- * in the file doc/FLOSS-exception.txt in this software distribution, or
- * online at
- * http://secondlifegrid.net/programs/open_source/licensing/flossexception
- *
- * By copying, modifying or distributing this software, you acknowledge
- * that you have read and understood your obligations described above,
- * and agree to abide by those obligations.
- *
- * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
- * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
- * COMPLETENESS OR PERFORMANCE.
- * $/LicenseInfo$
- */
- #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 );
- window_imp->convertCoords(cursor_coord_window, &gl_coord);
- MASK mask = gKeyboard->currentMask(TRUE);
- LLWindowCallbacks::DragNDropResult result = window_imp->completeDragNDropRequest( gl_coord, 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 );
- window_imp->convertCoords(cursor_coord_window, &gl_coord);
- MASK mask = gKeyboard->currentMask(TRUE);
- LLWindowCallbacks::DragNDropResult result = window_imp->completeDragNDropRequest( gl_coord, 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 )
- {
- LLCoordGL gl_coord( 0, 0 );
- 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 );
- window_imp->convertCoords(cursor_coord_window, &gl_coord);
- 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