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wxWidgets/src/gtk1/dnd.cpp

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///////////////////////////////////////////////////////////////////////////////
// Name: src/gtk1/dnd.cpp
// Purpose: wxDropTarget class
// Author: Robert Roebling
// Id: $Id$
// Copyright: (c) 1998 Robert Roebling
// Licence: wxWindows licence
///////////////////////////////////////////////////////////////////////////////
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#if wxUSE_DRAG_AND_DROP
#include "wx/dnd.h"
#ifndef WX_PRECOMP
#include "wx/intl.h"
#include "wx/log.h"
#include "wx/app.h"
#include "wx/utils.h"
#include "wx/window.h"
#include "wx/gdicmn.h"
#endif
#include "wx/gtk1/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;
#ifdef __WXDEBUG__
// 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");
#endif
// global variables because GTK+ DnD want to have the
// mouse event that caused it
extern GdkEvent *g_lastMouseEvent;
extern int g_lastButtonNumber;
//----------------------------------------------------------------------------
// standard icons
//----------------------------------------------------------------------------
/* Copyright (c) Julian Smart */
static const char * page_xpm[] = {
/* columns rows colors chars-per-pixel */
"32 32 37 1",
"5 c #7198D9",
", c #769CDA",
"2 c #DCE6F6",
"i c #FFFFFF",
"e c #779DDB",
": c #9AB6E4",
"9 c #EAF0FA",
"- c #B1C7EB",
"$ c #6992D7",
"y c #F7F9FD",
"= c #BED0EE",
"q c #F0F5FC",
"; c #A8C0E8",
"@ c #366BC2",
" c None",
"u c #FDFEFF",
"8 c #5987D3",
"* c #C4D5F0",
"7 c #7CA0DC",
"O c #487BCE",
"< c #6B94D7",
"& c #CCDAF2",
"> c #89A9DF",
"3 c #5584D1",
"w c #82A5DE",
"1 c #3F74CB",
"+ c #3A70CA",
". c #3569BF",
"% c #D2DFF4",
"# c #3366BB",
"r c #F5F8FD",
"0 c #FAFCFE",
"4 c #DFE8F7",
"X c #5E8AD4",
"o c #5282D0",
"t c #B8CCEC",
"6 c #E5EDF9",
/* pixels */
" ",
" ",
" ",
" ",
" ",
" .XXXooOO++@# ",
" $%&*=-;::>,<1 ",
" $2%&*=-;::><:3 ",
" $42%&*=-;::<&:3 ",
" 56477<<<<8<<9&:X ",
" 59642%&*=-;<09&:5 ",
" 5q9642%&*=-<<<<<# ",
" 5qqw777<<<<<88:>+ ",
" erqq9642%&*=t;::+ ",
" eyrqq9642%&*=t;:O ",
" eyywwww777<<<<t;O ",
" e0yyrqq9642%&*=to ",
" e00yyrqq9642%&*=o ",
" eu0wwwwwww777<&*X ",
" euu00yyrqq9642%&X ",
" eiuu00yyrqq9642%X ",
" eiiwwwwwwwwww742$ ",
" eiiiuu00yyrqq964$ ",
" eiiiiuu00yyrqq96$ ",
" eiiiiiuu00yyrqq95 ",
" eiiiiiiuu00yyrqq5 ",
" eeeeeeeeeeeeee55e ",
" ",
" ",
" ",
" ",
" "
};
// ============================================================================
// private functions
// ============================================================================
// ----------------------------------------------------------------------------
// convert between GTK+ and wxWidgets 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"
// ----------------------------------------------------------------------------
extern "C" {
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"
// ----------------------------------------------------------------------------
extern "C" {
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 (drop_target->GetDefaultAction() == wxDragNone)
{
// use default action set by wxDropSource::DoDragDrop()
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;
}
}
}
else if (drop_target->GetDefaultAction() == wxDragMove &&
(context->actions & GDK_ACTION_MOVE))
{
result = wxDragMove;
}
else
{
if (context->actions & GDK_ACTION_COPY)
result = wxDragCopy;
else if (context->actions & GDK_ACTION_MOVE)
result = wxDragMove;
else
result = wxDragNone;
}
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"
// ----------------------------------------------------------------------------
extern "C" {
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"
// ----------------------------------------------------------------------------
extern "C" {
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->action);
if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
{
wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned TRUE") );
/* tell GTK that data transfer was successful */
gtk_drag_finish( context, TRUE, FALSE, time );
}
else
{
wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned FALSE") );
/* tell GTK that data transfer was not successful */
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 = 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"
//----------------------------------------------------------------------------
extern "C" {
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"
//----------------------------------------------------------------------------
extern "C" {
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"
//----------------------------------------------------------------------------
extern "C" {
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"
//----------------------------------------------------------------------------
extern "C" {
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
//-----------------------------------------------------------------------------
extern "C" {
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 );
gtk_widget_push_visual (gdk_colormap_get_visual (colormap));
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);
gtk_widget_pop_visual ();
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;
// don't start dragging if no button is down
if (g_lastButtonNumber == 0)
return wxDragNone;
// we can only start a drag after a mouse event
if (g_lastMouseEvent == NULL)
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;
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,
g_lastButtonNumber, // number of mouse button which started drag
(GdkEvent*) g_lastMouseEvent );
m_dragContext = context;
PrepareIcon( action, context );
while (m_waiting)
gtk_main_iteration();
m_retValue = ConvertFromGTK(context->action);
if ( m_retValue == wxDragNone )
m_retValue = wxDragCancel;
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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