src/gtk/dnd.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        dnd.cpp
   3 // Purpose:     wxDropTarget class
   4 // Author:      Robert Roebling
   5 // Copyright:   Robert Roebling
   6 // Licence:     wxWindows license
   7 ///////////////////////////////////////////////////////////////////////////////
   8
   9 #ifdef __GNUG__
  10 #pragma implementation "dnd.h"
  11 #endif
  12
  13 #include "wx/dnd.h"
  14 #include "wx/window.h"
  15 #include "wx/app.h"
  16 #include "wx/gdicmn.h"
  17
  18 #include "gdk/gdkprivate.h"
  19
  20 #include <X11/Xlib.h>
  21
  22 // ----------------------------------------------------------------------------
  23 // global
  24 // ----------------------------------------------------------------------------
  25
  26 extern bool g_blockEventsOnDrag;
  27
  28 // ----------------------------------------------------------------------------
  29 // wxDropTarget
  30 // ----------------------------------------------------------------------------
  31
  32 wxDropTarget::wxDropTarget()
  33 {
  34 };
  35
  36 wxDropTarget::~wxDropTarget()
  37 {
  38 };
  39
  40 void wxDropTarget::Drop( GdkEvent *event, int x, int y )
  41 {
  42   printf( "Drop data is of type %s.\n", event->dropdataavailable.data_type );
  43
  44   OnDrop( x, y, (char *)event->dropdataavailable.data);
  45 };
  46
  47 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
  48 {
  49   gtk_widget_dnd_drop_set( widget, FALSE, NULL, 0, FALSE );
  50 };
  51
  52 // ----------------------------------------------------------------------------
  53 // wxTextDropTarget
  54 // ----------------------------------------------------------------------------
  55
  56 bool wxTextDropTarget::OnDrop( long x, long y, const void *pData )
  57 {
  58   OnDropText( x, y, (const char*)pData );
  59   return TRUE;
  60 };
  61
  62 bool wxTextDropTarget::OnDropText( long x, long y, const char *psz )
  63 {
  64   printf( "Got dropped text: %s.\n", psz );
  65   printf( "At x: %d, y: %d.\n", (int)x, (int)y );
  66   return TRUE;
  67 };
  68
  69 void wxTextDropTarget::RegisterWidget( GtkWidget *widget )
  70 {
  71   char *accepted_drop_types[] = { "text/plain" };
  72   gtk_widget_dnd_drop_set( widget, TRUE, accepted_drop_types, 1, FALSE );
  73 };
  74
  75 //-------------------------------------------------------------------------
  76 // wxDragSource
  77 //-------------------------------------------------------------------------
  78
  79 //-----------------------------------------------------------------------------
  80 // drag request
  81
  82 void gtk_drag_callback( GtkWidget *widget, GdkEvent *event, wxDragSource *drag )
  83 {
  84   printf( "OnDragRequest.\n" );
  85
  86   gtk_widget_dnd_data_set( widget, event, drag->m_data, drag->m_size );
  87 };
  88
  89 wxDragSource::wxDragSource( wxWindow *win )
  90 {
  91   g_blockEventsOnDrag = TRUE;
  92
  93   m_window = win;
  94   m_widget = win->m_widget;
  95   if (win->m_wxwindow) m_widget = win->m_wxwindow;
  96
  97   m_data = NULL;
  98   m_size = 0;
  99
 100   m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
 101   m_goaheadCursor = wxCursor( wxCURSOR_HAND );
 102 };
 103
 104 wxDragSource::~wxDragSource(void)
 105 {
 106   g_blockEventsOnDrag = FALSE;
 107 };
 108
 109 void wxDragSource::SetData( char *data, const long size )
 110 {
 111   m_size = size;
 112   m_data = data;
 113 };
 114
 115 void wxDragSource::Start( int x, int y )
 116 {
 117   if (gdk_dnd.dnd_grabbed) return;
 118   if (gdk_dnd.drag_really) return;
 119   if (m_size == 0) return;
 120   if (!m_data) return;
 121
 122   GdkWindowPrivate *wp = (GdkWindowPrivate*) m_widget->window;
 123
 124   RegisterWindow();
 125   ConnectWindow();
 126
 127   gdk_dnd.drag_perhaps = TRUE;
 128
 129   gdk_dnd.dnd_drag_start.x = 5;
 130   gdk_dnd.dnd_drag_start.y = 5;
 131   gdk_dnd.real_sw = wp;
 132
 133   if (gdk_dnd.drag_startwindows)
 134   {
 135     g_free( gdk_dnd.drag_startwindows );
 136     gdk_dnd.drag_startwindows = NULL;
 137   };
 138   gdk_dnd.drag_numwindows = gdk_dnd.drag_really = 0;
 139
 140   XWindowAttributes dnd_winattr;
 141   XGetWindowAttributes( gdk_display, wp->xwindow, &dnd_winattr );
 142   wp->dnd_drag_savedeventmask = dnd_winattr.your_event_mask;
 143
 144   gdk_dnd_drag_addwindow( m_widget->window );
 145
 146   GdkEventDragBegin ev;
 147   ev.type = GDK_DRAG_BEGIN;
 148   ev.window = m_widget->window;
 149   ev.u.allflags = 0;
 150   ev.u.flags.protocol_version = DND_PROTOCOL_VERSION;
 151
 152   gdk_event_put( (GdkEvent*)&ev );
 153
 154   XGrabPointer( gdk_display, wp->xwindow, False,
 155                 ButtonMotionMask | ButtonPressMask | ButtonReleaseMask | PointerMotionMask,
 156                 GrabModeAsync, GrabModeAsync, gdk_root_window, None, CurrentTime );
 157
 158   gdk_dnd_set_drag_cursors( m_defaultCursor.GetCursor(), m_goaheadCursor.GetCursor() );
 159
 160   gdk_dnd.dnd_grabbed = TRUE;
 161   gdk_dnd.drag_really = 1;
 162   gdk_dnd_display_drag_cursor( x, y, FALSE, TRUE );
 163
 164   while (gdk_dnd.drag_really || gdk_dnd.drag_perhaps) wxYield();
 165
 166   UnconnectWindow();
 167   UnregisterWindow();
 168 };
 169
 170 void wxDragSource::ConnectWindow(void)
 171 {
 172   gtk_signal_connect( GTK_OBJECT(m_widget), "drag_request_event",
 173     GTK_SIGNAL_FUNC(gtk_drag_callback), (gpointer)this );
 174 };
 175
 176 void wxDragSource::UnconnectWindow(void)
 177 {
 178   if (!m_widget) return;
 179
 180   gtk_signal_disconnect_by_data( GTK_OBJECT(m_widget), (gpointer)this );
 181 };
 182
 183 void wxDragSource::UnregisterWindow(void)
 184 {
 185   if (!m_widget) return;
 186
 187   gtk_widget_dnd_drag_set( m_widget, FALSE, NULL, 0 );
 188 };
 189
 190 //-------------------------------------------------------------------------
 191 // wxTextDragSource
 192 //-------------------------------------------------------------------------
 193
 194 void wxTextDragSource::SetTextData( const wxString &text )
 195 {
 196   m_tmp = text;
 197   SetData( WXSTRINGCAST(m_tmp), m_tmp.Length()+1 );
 198 };
 199
 200 void wxTextDragSource::RegisterWindow(void)
 201 {
 202   if (!m_widget) return;
 203
 204   char *accepted_drop_types[] = { "text/plain" };
 205   gtk_widget_dnd_drag_set( m_widget, TRUE, accepted_drop_types, 1 );
 206 };
 207