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wxWidgets/src/gtk1/dnd.cpp
Chris Elliott c03690057b lost log.h fixed 
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@16865 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2002-08-30 13:49:49 +00:00

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///////////////////////////////////////////////////////////////////////////////
// Name: dnd.cpp
// Purpose: wxDropTarget class
// Author: Robert Roebling
// Id: $Id$
// Copyright: (c) 1998 Robert Roebling
// Licence: wxWindows licence
///////////////////////////////////////////////////////////////////////////////
#ifdef __GNUG__
#pragma implementation "dnd.h"
#endif
#include "wx/dnd.h"
#include "wx/log.h"
#if wxUSE_DRAG_AND_DROP
#include "wx/window.h"
#include "wx/app.h"
#include "wx/gdicmn.h"
#include "wx/intl.h"
#include "wx/utils.h"
#include "wx/gtk/private.h"
#include <gdk/gdkprivate.h>
#include <gtk/gtkdnd.h>
#include <gtk/gtkselection.h>
//-----------------------------------------------------------------------------
// idle system
//-----------------------------------------------------------------------------
extern void wxapp_install_idle_handler();
extern bool g_isIdle;
//-----------------------------------------------------------------------------
// thread system
//-----------------------------------------------------------------------------
#if wxUSE_THREADS
#endif
//----------------------------------------------------------------------------
// global data
//----------------------------------------------------------------------------
extern bool g_blockEventsOnDrag;
// the flags used for the last DoDragDrop()
static long gs_flagsForDrag = 0;
// the trace mask we use with wxLogTrace() - call
// wxLog::AddTraceMask(TRACE_DND) to enable the trace messages from here
// (there are quite a few of them, so don't enable this by default)
static const wxChar *TRACE_DND = _T("dnd");
//----------------------------------------------------------------------------
// standard icons
//----------------------------------------------------------------------------
/* XPM */
static const char * page_xpm[] = {
/* width height ncolors chars_per_pixel */
"32 32 5 1",
/* colors */
" s None c None",
". c black",
"X c wheat",
"o c tan",
"O c #6699FF",
/* pixels */
" ................... ",
" .XXXXXXXXXXXXXXXXX.. ",
" .XXXXXXXXXXXXXXXXX.o. ",
" .XXXXXXXXXXXXXXXXX.oo. ",
" .XXXXXXXXXXXXXXXXX.ooo. ",
" .XXXXXXXXXXXXXXXXX.oooo. ",
" .XXXXXXXXXXXXXXXXX....... ",
" .XXXXXOOOOOOOOOOXXXooooo. ",
" .XXXXXXXXXXXXXXXXXXooooo. ",
" .XXXXXOOOOOOOOOOXXXXXXXX. ",
" .XXXXXXXXXXXXXXXXXXXXXXX. ",
" .XXXXXXXOOOOOOOOOXXXXXXX. ",
" .XXXXXXXXXXXXXXXXXXXXXXX. ",
" .XXXXXXOOOOOOOOOOXXXXXXX. ",
" .XXXXXXXXXXXXXXXXXXXXXXX. ",
" .XXXXXOOOOOOOOOOXXXXXXXX. ",
" .XXXXXXXXXXXXXXXXXXXXXXX. ",
" .XXXXXXXOOOOOOOOOXXXXXXX. ",
" .XXXXXXXXXXXXXXXXXXXXXXX. ",
" .XXXXXXOOOOOOOOOOXXXXXXX. ",
" .XXXXXXXXXXXXXXXXXXXXXXX. ",
" .XXXXXOOOOOOOOOOXXXXXXXX. ",
" .XXXXXXXXXXXXXXXXXXXXXXX. ",
" .XXXXXXOOOOOOOOOOXXXXXXX. ",
" .XXXXXXXXXXXXXXXXXXXXXXX. ",
" .XXXXXOOOOOOOXXXXXXXXXXX. ",
" .XXXXXXXXXXXXXXXXXXXXXXX. ",
" .XXXXXXXXXXXXXXXXXXXXXXX. ",
" .XXXXXXXXXXXXXXXXXXXXXXX. ",
" .XXXXXXXXXXXXXXXXXXXXXXX. ",
" .XXXXXXXXXXXXXXXXXXXXXXX. ",
" ......................... "};
// ============================================================================
// private functions
// ============================================================================
// ----------------------------------------------------------------------------
// convert between GTK+ and wxWindows DND constants
// ----------------------------------------------------------------------------
static wxDragResult ConvertFromGTK(long action)
{
switch ( action )
{
case GDK_ACTION_COPY:
return wxDragCopy;
case GDK_ACTION_LINK:
return wxDragLink;
case GDK_ACTION_MOVE:
return wxDragMove;
}
return wxDragNone;
}
// ----------------------------------------------------------------------------
// "drag_leave"
// ----------------------------------------------------------------------------
static void target_drag_leave( GtkWidget *WXUNUSED(widget),
GdkDragContext *context,
guint WXUNUSED(time),
wxDropTarget *drop_target )
{
if (g_isIdle) wxapp_install_idle_handler();
/* inform the wxDropTarget about the current GdkDragContext.
this is only valid for the duration of this call */
drop_target->SetDragContext( context );
/* we don't need return values. this event is just for
information */
drop_target->OnLeave();
/* this has to be done because GDK has no "drag_enter" event */
drop_target->m_firstMotion = TRUE;
/* after this, invalidate the drop_target's GdkDragContext */
drop_target->SetDragContext( (GdkDragContext*) NULL );
}
// ----------------------------------------------------------------------------
// "drag_motion"
// ----------------------------------------------------------------------------
static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
GdkDragContext *context,
gint x,
gint y,
guint time,
wxDropTarget *drop_target )
{
if (g_isIdle) wxapp_install_idle_handler();
/* Owen Taylor: "if the coordinates not in a drop zone,
return FALSE, otherwise call gtk_drag_status() and
return TRUE" */
/* inform the wxDropTarget about the current GdkDragContext.
this is only valid for the duration of this call */
drop_target->SetDragContext( context );
// GTK+ always supposes that we want to copy the data by default while we
// might want to move it, so examine not only suggested_action - which is
// only good if we don't have our own preferences - but also the actions
// field
wxDragResult result;
if ( (gs_flagsForDrag & wxDrag_DefaultMove) == wxDrag_DefaultMove &&
(context->actions & GDK_ACTION_MOVE ) )
{
// move is requested by the program and allowed by GTK+ - do it, even
// though suggested_action may be currently wxDragCopy
result = wxDragMove;
}
else // use whatever GTK+ says we should
{
result = ConvertFromGTK(context->suggested_action);
if ( (result == wxDragMove) && !(gs_flagsForDrag & wxDrag_AllowMove) )
{
// we're requested to move but we can't
result = wxDragCopy;
}
}
if (drop_target->m_firstMotion)
{
/* the first "drag_motion" event substitutes a "drag_enter" event */
result = drop_target->OnEnter( x, y, result );
}
else
{
/* give program a chance to react (i.e. to say no by returning FALSE) */
result = drop_target->OnDragOver( x, y, result );
}
bool ret = wxIsDragResultOk( result );
if (ret)
{
GdkDragAction action;
if (result == wxDragCopy)
action = GDK_ACTION_COPY;
else if (result == wxDragLink)
action = GDK_ACTION_LINK;
else
action = GDK_ACTION_MOVE;
gdk_drag_status( context, action, time );
}
/* after this, invalidate the drop_target's GdkDragContext */
drop_target->SetDragContext( (GdkDragContext*) NULL );
/* this has to be done because GDK has no "drag_enter" event */
drop_target->m_firstMotion = FALSE;
return ret;
}
// ----------------------------------------------------------------------------
// "drag_drop"
// ----------------------------------------------------------------------------
static gboolean target_drag_drop( GtkWidget *widget,
GdkDragContext *context,
gint x,
gint y,
guint time,
wxDropTarget *drop_target )
{
if (g_isIdle) wxapp_install_idle_handler();
/* Owen Taylor: "if the drop is not in a drop zone,
return FALSE, otherwise, if you aren't accepting
the drop, call gtk_drag_finish() with success == FALSE
otherwise call gtk_drag_data_get()" */
// printf( "drop.\n" );
/* this seems to make a difference between not accepting
due to wrong target area and due to wrong format. let
us hope that this is not required.. */
/* inform the wxDropTarget about the current GdkDragContext.
this is only valid for the duration of this call */
drop_target->SetDragContext( context );
/* inform the wxDropTarget about the current drag widget.
this is only valid for the duration of this call */
drop_target->SetDragWidget( widget );
/* inform the wxDropTarget about the current drag time.
this is only valid for the duration of this call */
drop_target->SetDragTime( time );
/*
wxDragResult result = wxDragMove;
if (context->suggested_action == GDK_ACTION_COPY) result = wxDragCopy;
*/
/* reset the block here as someone might very well
show a dialog as a reaction to a drop and this
wouldn't work without events */
g_blockEventsOnDrag = FALSE;
bool ret = drop_target->OnDrop( x, y );
if (!ret)
{
wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned FALSE") );
/* cancel the whole thing */
gtk_drag_finish( context,
FALSE, /* no success */
FALSE, /* don't delete data on dropping side */
time );
}
else
{
wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned TRUE") );
#if wxUSE_THREADS
/* disable GUI threads */
#endif
GdkAtom format = drop_target->GetMatchingPair();
// this does happen somehow, see bug 555111
wxCHECK_MSG( format, FALSE, _T("no matching GdkAtom for format?") )
/*
GdkDragAction action = GDK_ACTION_MOVE;
if (result == wxDragCopy) action == GDK_ACTION_COPY;
context->action = action;
*/
/* this should trigger an "drag_data_received" event */
gtk_drag_get_data( widget,
context,
format,
time );
#if wxUSE_THREADS
/* re-enable GUI threads */
#endif
}
/* after this, invalidate the drop_target's GdkDragContext */
drop_target->SetDragContext( (GdkDragContext*) NULL );
/* after this, invalidate the drop_target's drag widget */
drop_target->SetDragWidget( (GtkWidget*) NULL );
/* this has to be done because GDK has no "drag_enter" event */
drop_target->m_firstMotion = TRUE;
return ret;
}
// ----------------------------------------------------------------------------
// "drag_data_received"
// ----------------------------------------------------------------------------
static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
GdkDragContext *context,
gint x,
gint y,
GtkSelectionData *data,
guint WXUNUSED(info),
guint time,
wxDropTarget *drop_target )
{
if (g_isIdle) wxapp_install_idle_handler();
/* Owen Taylor: "call gtk_drag_finish() with
success == TRUE" */
if ((data->length <= 0) || (data->format != 8))
{
/* negative data length and non 8-bit data format
qualifies for junk */
gtk_drag_finish (context, FALSE, FALSE, time);
return;
}
wxLogTrace(TRACE_DND, wxT( "Drop target: data received event") );
/* inform the wxDropTarget about the current GtkSelectionData.
this is only valid for the duration of this call */
drop_target->SetDragData( data );
wxDragResult result = ConvertFromGTK(context->suggested_action);
if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
{
wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned TRUE") );
/* tell GTK that data transfer was successfull */
gtk_drag_finish( context, TRUE, FALSE, time );
}
else
{
wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned FALSE") );
/* tell GTK that data transfer was not successfull */
gtk_drag_finish( context, FALSE, FALSE, time );
}
/* after this, invalidate the drop_target's drag data */
drop_target->SetDragData( (GtkSelectionData*) NULL );
}
//----------------------------------------------------------------------------
// wxDropTarget
//----------------------------------------------------------------------------
wxDropTarget::wxDropTarget( wxDataObject *data )
: wxDropTargetBase( data )
{
m_firstMotion = TRUE;
m_dragContext = (GdkDragContext*) NULL;
m_dragWidget = (GtkWidget*) NULL;
m_dragData = (GtkSelectionData*) NULL;
m_dragTime = 0;
}
wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
wxCoord WXUNUSED(y),
wxDragResult def )
{
// GetMatchingPair() checks for m_dataObject too, no need to do it here
// disable the debug message from GetMatchingPair() - there are too many
// of them otherwise
#ifdef __WXDEBUG__
wxLogNull noLog;
#endif // Debug
return (GetMatchingPair() != (GdkAtom) 0) ? def : wxDragNone;
}
bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
{
if (!m_dataObject)
return FALSE;
return (GetMatchingPair() != (GdkAtom) 0);
}
wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
wxDragResult def )
{
if (!m_dataObject)
return wxDragNone;
if (GetMatchingPair() == (GdkAtom) 0)
return wxDragNone;
return GetData() ? def : wxDragNone;
}
GdkAtom wxDropTarget::GetMatchingPair()
{
if (!m_dataObject)
return (GdkAtom) 0;
if (!m_dragContext)
return (GdkAtom) 0;
GList *child = m_dragContext->targets;
while (child)
{
GdkAtom formatAtom = (GdkAtom) GPOINTER_TO_INT(child->data);
wxDataFormat format( formatAtom );
#ifdef __WXDEBUG__
wxLogTrace(TRACE_DND, wxT("Drop target: drag has format: %s"),
format.GetId().c_str());
#endif // Debug
if (m_dataObject->IsSupportedFormat( format ))
return formatAtom;
child = child->next;
}
return (GdkAtom) 0;
}
bool wxDropTarget::GetData()
{
if (!m_dragData)
return FALSE;
if (!m_dataObject)
return FALSE;
wxDataFormat dragFormat( m_dragData->target );
if (!m_dataObject->IsSupportedFormat( dragFormat ))
return FALSE;
m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
return TRUE;
}
void wxDropTarget::UnregisterWidget( GtkWidget *widget )
{
wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
gtk_drag_dest_unset( widget );
gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
}
void wxDropTarget::RegisterWidget( GtkWidget *widget )
{
wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
/* gtk_drag_dest_set() determines what default behaviour we'd like
GTK to supply. we don't want to specify out targets (=formats)
or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
not GTK_DEST_DEFAULT_DROP). instead we react individually to
"drag_motion" and "drag_drop" events. this makes it possible
to allow dropping on only a small area. we should set
GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
highlighting if dragging over standard controls, but this
seems to be broken without the other two. */
gtk_drag_dest_set( widget,
(GtkDestDefaults) 0, /* no default behaviour */
(GtkTargetEntry*) NULL, /* we don't supply any formats here */
0, /* number of targets = 0 */
(GdkDragAction) 0 ); /* we don't supply any actions here */
gtk_signal_connect( GTK_OBJECT(widget), "drag_leave",
GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
gtk_signal_connect( GTK_OBJECT(widget), "drag_motion",
GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
gtk_signal_connect( GTK_OBJECT(widget), "drag_drop",
GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
gtk_signal_connect( GTK_OBJECT(widget), "drag_data_received",
GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
}
//----------------------------------------------------------------------------
// "drag_data_get"
//----------------------------------------------------------------------------
static void
source_drag_data_get (GtkWidget *WXUNUSED(widget),
GdkDragContext *WXUNUSED(context),
GtkSelectionData *selection_data,
guint WXUNUSED(info),
guint WXUNUSED(time),
wxDropSource *drop_source )
{
if (g_isIdle) wxapp_install_idle_handler();
wxDataFormat format( selection_data->target );
wxLogTrace(TRACE_DND, wxT("Drop source: format requested: %s"),
format.GetId().c_str());
drop_source->m_retValue = wxDragCancel;
wxDataObject *data = drop_source->GetDataObject();
if (!data)
{
wxLogTrace(TRACE_DND, wxT("Drop source: no data object") );
return;
}
if (!data->IsSupportedFormat(format))
{
wxLogTrace(TRACE_DND, wxT("Drop source: unsupported format") );
return;
}
if (data->GetDataSize(format) == 0)
{
wxLogTrace(TRACE_DND, wxT("Drop source: empty data") );
return;
}
size_t size = data->GetDataSize(format);
// printf( "data size: %d.\n", (int)data_size );
guchar *d = new guchar[size];
if (!data->GetDataHere( format, (void*)d ))
{
delete[] d;
return;
}
#if wxUSE_THREADS
/* disable GUI threads */
#endif
gtk_selection_data_set( selection_data,
selection_data->target,
8, // 8-bit
d,
size );
#if wxUSE_THREADS
/* enable GUI threads */
#endif
delete[] d;
}
//----------------------------------------------------------------------------
// "drag_data_delete"
//----------------------------------------------------------------------------
static void source_drag_data_delete( GtkWidget *WXUNUSED(widget),
GdkDragContext *context,
wxDropSource *WXUNUSED(drop_source) )
{
if (g_isIdle)
wxapp_install_idle_handler();
// printf( "Drag source: drag_data_delete\n" );
}
//----------------------------------------------------------------------------
// "drag_begin"
//----------------------------------------------------------------------------
static void source_drag_begin( GtkWidget *WXUNUSED(widget),
GdkDragContext *WXUNUSED(context),
wxDropSource *WXUNUSED(drop_source) )
{
if (g_isIdle)
wxapp_install_idle_handler();
// printf( "Drag source: drag_begin.\n" );
}
//----------------------------------------------------------------------------
// "drag_end"
//----------------------------------------------------------------------------
static void source_drag_end( GtkWidget *WXUNUSED(widget),
GdkDragContext *WXUNUSED(context),
wxDropSource *drop_source )
{
if (g_isIdle) wxapp_install_idle_handler();
// printf( "Drag source: drag_end.\n" );
drop_source->m_waiting = FALSE;
}
//-----------------------------------------------------------------------------
// "configure_event" from m_iconWindow
//-----------------------------------------------------------------------------
static gint
gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
{
if (g_isIdle)
wxapp_install_idle_handler();
source->GiveFeedback( ConvertFromGTK(source->m_dragContext->action) );
return 0;
}
//---------------------------------------------------------------------------
// wxDropSource
//---------------------------------------------------------------------------
wxDropSource::wxDropSource(wxWindow *win,
const wxIcon &iconCopy,
const wxIcon &iconMove,
const wxIcon &iconNone)
{
m_waiting = TRUE;
m_iconWindow = (GtkWidget*) NULL;
m_window = win;
m_widget = win->m_widget;
if (win->m_wxwindow) m_widget = win->m_wxwindow;
m_retValue = wxDragCancel;
SetIcons(iconCopy, iconMove, iconNone);
}
wxDropSource::wxDropSource(wxDataObject& data,
wxWindow *win,
const wxIcon &iconCopy,
const wxIcon &iconMove,
const wxIcon &iconNone)
{
m_waiting = TRUE;
SetData( data );
m_iconWindow = (GtkWidget*) NULL;
m_window = win;
m_widget = win->m_widget;
if (win->m_wxwindow) m_widget = win->m_wxwindow;
m_retValue = wxDragCancel;
SetIcons(iconCopy, iconMove, iconNone);
}
void wxDropSource::SetIcons(const wxIcon &iconCopy,
const wxIcon &iconMove,
const wxIcon &iconNone)
{
m_iconCopy = iconCopy;
m_iconMove = iconMove;
m_iconNone = iconNone;
if ( !m_iconCopy.Ok() )
m_iconCopy = wxIcon(page_xpm);
if ( !m_iconMove.Ok() )
m_iconMove = m_iconCopy;
if ( !m_iconNone.Ok() )
m_iconNone = m_iconCopy;
}
wxDropSource::~wxDropSource()
{
}
void wxDropSource::PrepareIcon( int action, GdkDragContext *context )
{
// get the right icon to display
wxIcon *icon = NULL;
if ( action & GDK_ACTION_MOVE )
icon = &m_iconMove;
else if ( action & GDK_ACTION_COPY )
icon = &m_iconCopy;
else
icon = &m_iconNone;
GdkBitmap *mask;
if ( icon->GetMask() )
mask = icon->GetMask()->GetBitmap();
else
mask = (GdkBitmap *)NULL;
GdkPixmap *pixmap = icon->GetPixmap();
gint width,height;
gdk_window_get_size (pixmap, &width, &height);
GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
#ifndef __WXGTK20__
gtk_widget_push_visual (gdk_colormap_get_visual (colormap));
#endif
gtk_widget_push_colormap (colormap);
m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP);
gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
gtk_widget_set_app_paintable (GTK_WIDGET (m_iconWindow), TRUE);
#ifndef __WXGTK20__
gtk_widget_pop_visual ();
#endif
gtk_widget_pop_colormap ();
gtk_widget_set_usize (m_iconWindow, width, height);
gtk_widget_realize (m_iconWindow);
gtk_signal_connect( GTK_OBJECT(m_iconWindow), "configure_event",
GTK_SIGNAL_FUNC(gtk_dnd_window_configure_callback), (gpointer)this );
gdk_window_set_back_pixmap (m_iconWindow->window, pixmap, FALSE);
if (mask)
gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
}
wxDragResult wxDropSource::DoDragDrop(int flags)
{
wxCHECK_MSG( m_data && m_data->GetFormatCount(), wxDragNone,
wxT("Drop source: no data") );
// still in drag
if (g_blockEventsOnDrag)
return wxDragNone;
// disabled for now
g_blockEventsOnDrag = TRUE;
RegisterWindow();
m_waiting = TRUE;
GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
m_data->GetAllFormats( array );
size_t count = m_data->GetFormatCount();
for (size_t i = 0; i < count; i++)
{
GdkAtom atom = array[i];
wxLogTrace(TRACE_DND, wxT("Drop source: Supported atom %s"), gdk_atom_name( atom ));
gtk_target_list_add( target_list, atom, 0, 0 );
}
delete[] array;
GdkEventMotion event;
event.window = m_widget->window;
int x = 0;
int y = 0;
GdkModifierType state;
gdk_window_get_pointer( event.window, &x, &y, &state );
event.x = x;
event.y = y;
event.state = state;
event.time = (guint32)GDK_CURRENT_TIME;
/* GTK wants to know which button was pressed which caused the dragging */
int button_number = 0;
if (event.state & GDK_BUTTON1_MASK) button_number = 1;
else if (event.state & GDK_BUTTON2_MASK) button_number = 2;
else if (event.state & GDK_BUTTON3_MASK) button_number = 3;
#if wxUSE_THREADS
/* disable GUI threads */
#endif
/* don't start dragging if no button is down */
if (button_number)
{
int action = GDK_ACTION_COPY;
if ( flags & wxDrag_AllowMove )
action |= GDK_ACTION_MOVE;
// VZ: as we already use g_blockEventsOnDrag it shouldn't be that bad
// to use a global to pass the flags to the drop target but I'd
// surely prefer a better way to do it
gs_flagsForDrag = flags;
GdkDragContext *context = gtk_drag_begin( m_widget,
target_list,
(GdkDragAction)action,
button_number, /* number of mouse button which started drag */
(GdkEvent*) &event );
m_dragContext = context;
PrepareIcon( action, context );
while (m_waiting)
gtk_main_iteration();
m_retValue = ConvertFromGTK(context->action);
if ( m_retValue == wxDragNone )
m_retValue = wxDragCancel;
}
#if wxUSE_THREADS
/* re-enable GUI threads */
#endif
g_blockEventsOnDrag = FALSE;
UnregisterWindow();
return m_retValue;
}
void wxDropSource::RegisterWindow()
{
if (!m_widget) return;
gtk_signal_connect( GTK_OBJECT(m_widget), "drag_data_get",
GTK_SIGNAL_FUNC (source_drag_data_get), (gpointer) this);
gtk_signal_connect (GTK_OBJECT(m_widget), "drag_data_delete",
GTK_SIGNAL_FUNC (source_drag_data_delete), (gpointer) this );
gtk_signal_connect (GTK_OBJECT(m_widget), "drag_begin",
GTK_SIGNAL_FUNC (source_drag_begin), (gpointer) this );
gtk_signal_connect (GTK_OBJECT(m_widget), "drag_end",
GTK_SIGNAL_FUNC (source_drag_end), (gpointer) this );
}
void wxDropSource::UnregisterWindow()
{
if (!m_widget) return;
gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
GTK_SIGNAL_FUNC(source_drag_data_get), (gpointer) this );
gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
GTK_SIGNAL_FUNC(source_drag_data_delete), (gpointer) this );
gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
GTK_SIGNAL_FUNC(source_drag_begin), (gpointer) this );
gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
GTK_SIGNAL_FUNC(source_drag_end), (gpointer) this );
}
#endif
// wxUSE_DRAG_AND_DROP
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