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fltk/src/fl_dnd_win32.cxx
Matthias Melcher 5251b64d57 Changed Copyright in 'src' directory 
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@6616 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
2009-01-01 21:28:26 +00:00

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//
// "$Id$"
//
// Drag & Drop code for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2009 by Bill Spitzak and others.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// 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
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA.
//
// Please report all bugs and problems to "fltk-bugs@fltk.org
// This file contains win32-specific code for fltk which is always linked
// in. Search other files for "WIN32" or filenames ending in _win32.cxx
// for other system-specific code.
#include <FL/Fl.H>
#include <FL/x.H>
#include <FL/Fl_Window.H>
#include <FL/fl_utf8.h>
#include "flstring.h"
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <objidl.h>
#include <time.h>
#if defined(__CYGWIN__)
#include <sys/time.h>
#include <unistd.h>
#else
#include <winsock2.h>
#endif
extern char *fl_selection_buffer[2];
extern int fl_selection_length[2];
extern int fl_selection_buffer_length[2];
extern char fl_i_own_selection[2];
extern char *fl_locale2utf8(const char *s, UINT codepage = 0);
extern unsigned int fl_codepage;
Fl_Window *fl_dnd_target_window = 0;
// All of the following code requires GCC 3.x or a non-GNU compiler...
#if !defined(__GNUC__) || __GNUC__ >= 3
#include <ole2.h>
#include <shellapi.h>
#include <shlobj.h>
/**
* subclass the IDropTarget to receive data from DnD operations
*/
class FLDropTarget : public IDropTarget
{
DWORD m_cRefCount;
DWORD lastEffect;
int px, py;
public:
FLDropTarget() : m_cRefCount(0) { } // initialize
HRESULT STDMETHODCALLTYPE QueryInterface( REFIID riid, LPVOID *ppvObject ) {
if (IID_IUnknown==riid || IID_IDropTarget==riid)
{
*ppvObject=this;
((LPUNKNOWN)*ppvObject)->AddRef();
return S_OK;
}
*ppvObject = NULL;
return E_NOINTERFACE;
}
ULONG STDMETHODCALLTYPE AddRef() { return ++m_cRefCount; }
ULONG STDMETHODCALLTYPE Release() {
long nTemp;
nTemp = --m_cRefCount;
if(nTemp==0)
delete this;
return nTemp;
}
HRESULT STDMETHODCALLTYPE DragEnter( IDataObject *pDataObj, DWORD /*grfKeyState*/, POINTL pt, DWORD *pdwEffect) {
if( !pDataObj ) return E_INVALIDARG;
// set e_modifiers here from grfKeyState, set e_x and e_root_x
// check if FLTK handles this drag and return if it can't (i.e. BMP drag without filename)
POINT ppt;
Fl::e_x_root = ppt.x = pt.x;
Fl::e_y_root = ppt.y = pt.y;
HWND hWnd = WindowFromPoint( ppt );
Fl_Window *target = fl_find( hWnd );
if (target) {
Fl::e_x = Fl::e_x_root-target->x();
Fl::e_y = Fl::e_y_root-target->y();
}
fl_dnd_target_window = target;
px = pt.x; py = pt.y;
if (fillCurrentDragData(pDataObj)) {
// FLTK has no mechanism yet for the different drop effects, so we allow move and copy
if ( target && Fl::handle( FL_DND_ENTER, target ) )
*pdwEffect = DROPEFFECT_MOVE|DROPEFFECT_COPY; //|DROPEFFECT_LINK;
else
*pdwEffect = DROPEFFECT_NONE;
} else {
*pdwEffect = DROPEFFECT_NONE;
}
lastEffect = *pdwEffect;
return S_OK;
}
HRESULT STDMETHODCALLTYPE DragOver( DWORD /*grfKeyState*/, POINTL pt, DWORD *pdwEffect) {
if ( px==pt.x && py==pt.y )
{
*pdwEffect = lastEffect;
return S_OK;
}
if ( !fl_dnd_target_window )
{
*pdwEffect = lastEffect = DROPEFFECT_NONE;
return S_OK;
}
// set e_modifiers here from grfKeyState, set e_x and e_root_x
Fl::e_x_root = pt.x;
Fl::e_y_root = pt.y;
if (fl_dnd_target_window) {
Fl::e_x = Fl::e_x_root-fl_dnd_target_window->x();
Fl::e_y = Fl::e_y_root-fl_dnd_target_window->y();
}
if (fillCurrentDragData(0)) {
// Fl_Group will change DND_DRAG into DND_ENTER and DND_LEAVE if needed
if ( Fl::handle( FL_DND_DRAG, fl_dnd_target_window ) )
*pdwEffect = DROPEFFECT_MOVE|DROPEFFECT_COPY; //|DROPEFFECT_LINK;
else
*pdwEffect = DROPEFFECT_NONE;
} else {
*pdwEffect = DROPEFFECT_NONE;
}
px = pt.x; py = pt.y;
lastEffect = *pdwEffect;
return S_OK;
}
HRESULT STDMETHODCALLTYPE DragLeave() {
if ( fl_dnd_target_window && fillCurrentDragData(0))
{
Fl::handle( FL_DND_LEAVE, fl_dnd_target_window );
fl_dnd_target_window = 0;
clearCurrentDragData();
}
return S_OK;
}
HRESULT STDMETHODCALLTYPE Drop( IDataObject *data, DWORD /*grfKeyState*/, POINTL pt, DWORD* /*pdwEffect*/) {
if ( !fl_dnd_target_window )
return S_OK;
Fl_Window *target = fl_dnd_target_window;
fl_dnd_target_window = 0;
Fl::e_x_root = pt.x;
Fl::e_y_root = pt.y;
if (target) {
Fl::e_x = Fl::e_x_root-target->x();
Fl::e_y = Fl::e_y_root-target->y();
}
// tell FLTK that the user released an object on this widget
if ( !Fl::handle( FL_DND_RELEASE, target ) )
return S_OK;
Fl_Widget *w = target;
while (w->parent()) w = w->window();
HWND hwnd = fl_xid( (Fl_Window*)w );
if (fillCurrentDragData(data)) {
int old_event = Fl::e_number;
Fl::belowmouse()->handle(Fl::e_number = FL_PASTE); // e_text will be invalid after this call
Fl::e_number = old_event;
SetForegroundWindow( hwnd );
clearCurrentDragData();
return S_OK;
}
return S_OK;
}
private:
static IDataObject *currDragRef;
static char *currDragData;
static int currDragSize;
static char currDragResult;
static void clearCurrentDragData() {
currDragRef = 0;
if (currDragData) free(currDragData);
currDragData = 0;
currDragSize = 0;
currDragResult = 0;
}
static char fillCurrentDragData(IDataObject *data) {
// shortcut through this whole procedure if there is no fresh data
if (!data)
return currDragResult;
// shortcut through this whole procedure if this is still the same drag event
// (* this is safe, because 'currDragRef' is cleared on Leave and Drop events)
if (data==currDragRef)
return currDragResult;
// clear currDrag* for a new drag event
clearCurrentDragData();
// fill currDrag* with ASCII data, if available
FORMATETC fmt = { 0 };
STGMEDIUM medium = { 0 };
fmt.tymed = TYMED_HGLOBAL;
fmt.dwAspect = DVASPECT_CONTENT;
fmt.lindex = -1;
fmt.cfFormat = CF_TEXT;
// if it is ASCII text, return a copy of it
if ( data->GetData( &fmt, &medium )==S_OK )
{
void *stuff = GlobalLock( medium.hGlobal );
Fl::e_length = strlen((char*)stuff);
Fl::e_text = strdup((char*)stuff);
GlobalUnlock( medium.hGlobal );
ReleaseStgMedium( &medium );
currDragResult = 1;
return currDragResult;
}
// else fill currDrag* with filenames, if possible
memset(&fmt, 0, sizeof(fmt));
fmt.tymed = TYMED_HGLOBAL;
fmt.dwAspect = DVASPECT_CONTENT;
fmt.lindex = -1;
fmt.cfFormat = CF_HDROP;
// if it is a pathname list, send an FL_PASTE with a \n separated list of filepaths
if ( data->GetData( &fmt, &medium )==S_OK )
{
HDROP hdrop = (HDROP)medium.hGlobal;
int i, n, nn = 0, nf = DragQueryFileW( hdrop, (UINT)-1, 0, 0 );
for ( i=0; i<nf; i++ ) nn += DragQueryFileW( hdrop, i, 0, 0 );
nn += nf;
xchar *dst = (xchar *)malloc(nn * sizeof(xchar));
xchar *bu = dst;
for ( i=0; i<nf; i++ ) {
n = DragQueryFileW( hdrop, i, (WCHAR*)dst, nn );
dst += n;
if ( i<nf-1 ) {
*dst++ = L'\n';
}
}
*dst=0;
Fl::e_text = (char*) malloc(nn * 5 + 1);
// Fl::e_length = fl_unicode2utf(bu, nn, Fl::e_text);
Fl::e_length = fl_utf8fromwc(Fl::e_text, (nn*5+1), bu, nn);
Fl::e_text[Fl::e_length] = 0;
free(bu);
// Fl::belowmouse()->handle(FL_DROP);
// free( Fl::e_text );
ReleaseStgMedium( &medium );
currDragResult = 1;
return currDragResult;
}
currDragResult = 0;
return currDragResult;
}
} flDropTarget;
IDropTarget *flIDropTarget = &flDropTarget;
IDataObject *FLDropTarget::currDragRef = 0;
char *FLDropTarget::currDragData = 0;
int FLDropTarget::currDragSize = 0;
char FLDropTarget::currDragResult = 0;
/**
* this class is needed to allow FLTK apps to be a DnD source
*/
class FLDropSource : public IDropSource
{
DWORD m_cRefCount;
public:
FLDropSource() { m_cRefCount = 0; }
HRESULT STDMETHODCALLTYPE QueryInterface( REFIID riid, LPVOID *ppvObject ) {
if (IID_IUnknown==riid || IID_IDropSource==riid)
{
*ppvObject=this;
((LPUNKNOWN)*ppvObject)->AddRef();
return S_OK;
}
*ppvObject = NULL;
return E_NOINTERFACE;
}
ULONG STDMETHODCALLTYPE AddRef() { return ++m_cRefCount; }
ULONG STDMETHODCALLTYPE Release() {
long nTemp;
nTemp = --m_cRefCount;
if(nTemp==0)
delete this;
return nTemp;
}
STDMETHODIMP GiveFeedback( ulong ) { return DRAGDROP_S_USEDEFAULTCURSORS; }
STDMETHODIMP QueryContinueDrag( BOOL esc, DWORD keyState ) {
if ( esc )
return DRAGDROP_S_CANCEL;
if ( !(keyState & (MK_LBUTTON|MK_MBUTTON|MK_RBUTTON)) )
return DRAGDROP_S_DROP;
return S_OK;
}
};
class FLEnum : public IEnumFORMATETC
{
public:
int n;
LONG m_lRefCount;
ULONG __stdcall AddRef(void) {
return InterlockedIncrement(&m_lRefCount);
}
ULONG __stdcall Release(void) {
LONG count = InterlockedDecrement(&m_lRefCount);
if(count == 0) {
delete this;
return 0;
} else {
return count;
}
}
HRESULT __stdcall QueryInterface(REFIID iid, void **ppvObject) {
if(iid == IID_IEnumFORMATETC || iid == IID_IUnknown) {
AddRef();
*ppvObject = this;
return S_OK;
} else {
*ppvObject = 0;
return E_NOINTERFACE;
}
}
HRESULT __stdcall Next(ULONG celt, FORMATETC * rgelt, ULONG *pceltFetched) {
if (n > 0) return S_FALSE;
for (ULONG i = 0; i < celt; i++) {
n++;
rgelt->cfFormat = CF_HDROP;
rgelt->dwAspect = DVASPECT_CONTENT;
rgelt->lindex = -1;
rgelt->ptd = NULL;
rgelt->tymed = TYMED_HGLOBAL;
}
if (pceltFetched) *pceltFetched = celt;
return S_OK;
}
HRESULT __stdcall Skip(ULONG celt) {
n += celt;
return (n == 0) ? S_OK : S_FALSE;
}
HRESULT __stdcall Reset(void) {
n = 0;
return S_OK;
}
HRESULT __stdcall Clone(IEnumFORMATETC **ppenum){
*ppenum = new FLEnum();
return S_OK;
}
FLEnum(void) {
m_lRefCount = 1;
n = 0;
}
~FLEnum(void) {
n = 0;
}
};
/**
This is the actual object that FLTK can drop somewhere.
The implementation is minimal, but it should work with all decent Win32 drop targets
*/
class FLDataObject : public IDataObject
{
DWORD m_cRefCount;
FLEnum *m_EnumF;
public:
FLDataObject() { m_cRefCount = 1; }// m_EnumF = new FLEnum();}
HRESULT STDMETHODCALLTYPE QueryInterface( REFIID riid, LPVOID *ppvObject ) {
if (IID_IUnknown==riid || IID_IDataObject==riid)
{
*ppvObject=this;
((LPUNKNOWN)*ppvObject)->AddRef();
return S_OK;
}
*ppvObject = NULL;
return E_NOINTERFACE;
}
ULONG STDMETHODCALLTYPE AddRef() { return ++m_cRefCount; }
ULONG STDMETHODCALLTYPE Release() {
long nTemp;
nTemp = --m_cRefCount;
if(nTemp==0)
delete this;
return nTemp;
}
// GetData currently allows ASCII text through Global Memory only
HRESULT STDMETHODCALLTYPE GetData( FORMATETC *pformatetcIn, STGMEDIUM *pmedium ) {
if ((pformatetcIn->dwAspect & DVASPECT_CONTENT) &&
(pformatetcIn->tymed & TYMED_HGLOBAL) &&
(pformatetcIn->cfFormat == CF_TEXT))
{
HGLOBAL gh = GlobalAlloc( GHND, fl_selection_length[0]+1 );
char *pMem = (char*)GlobalLock( gh );
memmove( pMem, fl_selection_buffer[0], fl_selection_length[0] );
pMem[ fl_selection_length[0] ] = 0;
// HGLOBAL gh = GlobalAlloc( GHND| GMEM_SHARE,
// (fl_selection_length[0]+4) * sizeof(short)
// + sizeof(DROPFILES));
// unsigned char *pMem = (unsigned char*)GlobalLock( gh );
// if (!pMem) {
// GlobalFree(gh);
// return DV_E_FORMATETC;
// }
// DROPFILES *df =(DROPFILES*) pMem;
// int l;
// df->pFiles = sizeof(DROPFILES);
// df->pt.x = 0;
// df->pt.y = 0;
// df->fNC = FALSE;
// for (int i = 0; i < fl_selection_length[0]; i++) {
// if (fl_selection_buffer[0][i] == '\n') {
// fl_selection_buffer[0][i] = '\0';
// }
// }
//
// df->fWide = TRUE;
// l = fl_utf2unicode((unsigned char*)fl_selection_buffer[0],
// fl_selection_length[0], (xchar*)(((char*)pMem)
// + sizeof(DROPFILES)));
//
// pMem[l * sizeof(WCHAR) + sizeof(DROPFILES)] = 0;
// pMem[l * sizeof(WCHAR) + 1 + sizeof(DROPFILES)] = 0;
// pMem[l * sizeof(WCHAR) + 2 + sizeof(DROPFILES)] = 0;
// pMem[l * sizeof(WCHAR) + 3 + sizeof(DROPFILES)] = 0;
pmedium->tymed = TYMED_HGLOBAL;
pmedium->hGlobal = gh;
pmedium->pUnkForRelease = NULL;
GlobalUnlock( gh );
return S_OK;
}
return DV_E_FORMATETC;
}
HRESULT STDMETHODCALLTYPE QueryGetData( FORMATETC *pformatetc )
{
if ((pformatetc->dwAspect & DVASPECT_CONTENT) &&
(pformatetc->tymed & TYMED_HGLOBAL) &&
(pformatetc->cfFormat == CF_TEXT))
return S_OK;
return DV_E_FORMATETC;
}
// HRESULT STDMETHODCALLTYPE EnumFormatEtc( DWORD dir, IEnumFORMATETC** ppenumFormatEtc) {
// *ppenumFormatEtc = m_EnumF;
// return S_OK;
// }
// all the following methods are not really needed for a DnD object
HRESULT STDMETHODCALLTYPE GetDataHere( FORMATETC* /*pformatetcIn*/, STGMEDIUM* /*pmedium*/) { return E_NOTIMPL; }
HRESULT STDMETHODCALLTYPE GetCanonicalFormatEtc( FORMATETC* /*in*/, FORMATETC* /*out*/) { return E_NOTIMPL; }
HRESULT STDMETHODCALLTYPE SetData( FORMATETC* /*pformatetc*/, STGMEDIUM* /*pmedium*/, BOOL /*fRelease*/) { return E_NOTIMPL; }
HRESULT STDMETHODCALLTYPE EnumFormatEtc( DWORD /*dir*/, IEnumFORMATETC** /*ppenumFormatEtc*/) { return E_NOTIMPL; }
// HRESULT STDMETHODCALLTYPE EnumFormatEtc( DWORD dir, IEnumFORMATETC** ppenumFormatEtc) {*ppenumFormatEtc = m_EnumF; return S_OK;}
HRESULT STDMETHODCALLTYPE DAdvise( FORMATETC* /*pformatetc*/, DWORD /*advf*/,
IAdviseSink* /*pAdvSink*/, DWORD* /*pdwConnection*/) { return E_NOTIMPL; }
HRESULT STDMETHODCALLTYPE DUnadvise( DWORD /*dwConnection*/) { return E_NOTIMPL; }
HRESULT STDMETHODCALLTYPE EnumDAdvise( IEnumSTATDATA** /*ppenumAdvise*/) { return E_NOTIMPL; }
};
/**
Drag and drop whatever is in the cut-copy-paste buffer.
Create a selection first using:
Fl::copy(const char *stuff, int len, 0)
*/
int Fl::dnd()
{
DWORD dropEffect;
ReleaseCapture();
FLDataObject *fdo = new FLDataObject;
fdo->AddRef();
FLDropSource *fds = new FLDropSource;
fds->AddRef();
HRESULT ret = DoDragDrop( fdo, fds, DROPEFFECT_MOVE|DROPEFFECT_LINK|DROPEFFECT_COPY, &dropEffect );
fdo->Release();
fds->Release();
Fl_Widget *w = Fl::pushed();
if ( w )
{
int old_event = Fl::e_number;
w->handle(Fl::e_number = FL_RELEASE);
Fl::e_number = old_event;
Fl::pushed( 0 );
}
if ( ret==DRAGDROP_S_DROP ) return 1; // or DD_S_CANCEL
return 0;
}
#else
int Fl::dnd()
{
// Always indicate DnD failed when using GCC < 3...
return 1;
}
#endif // !__GNUC__ || __GNUC__ >= 3
//
// End of "$Id$".
//
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