1/////////////////////////////////////////////////////////////////////////////// 2// Name: src/gtk/dnd.cpp 3// Purpose: wxDropTarget class 4// Author: Robert Roebling 5// Id: $Id: dnd.cpp 65480 2010-09-08 20:01:32Z RR $ 6// Copyright: (c) 1998 Robert Roebling 7// Licence: wxWindows licence 8/////////////////////////////////////////////////////////////////////////////// 9 10// For compilers that support precompilation, includes "wx.h". 11#include "wx/wxprec.h" 12 13#if wxUSE_DRAG_AND_DROP 14 15#include "wx/dnd.h" 16 17#ifndef WX_PRECOMP 18 #include "wx/intl.h" 19 #include "wx/log.h" 20 #include "wx/app.h" 21 #include "wx/utils.h" 22 #include "wx/window.h" 23 #include "wx/gdicmn.h" 24#endif 25 26#include "wx/gtk/private.h" 27 28#include <gdk/gdkprivate.h> 29 30#include <gtk/gtkdnd.h> 31#include <gtk/gtkselection.h> 32 33//---------------------------------------------------------------------------- 34// global data 35//---------------------------------------------------------------------------- 36 37extern bool g_blockEventsOnDrag; 38 39// the flags used for the last DoDragDrop() 40static long gs_flagsForDrag = 0; 41 42#ifdef __WXDEBUG__ 43// the trace mask we use with wxLogTrace() - call 44// wxLog::AddTraceMask(TRACE_DND) to enable the trace messages from here 45// (there are quite a few of them, so don't enable this by default) 46static const wxChar *TRACE_DND = _T("dnd"); 47#endif 48 49// global variables because GTK+ DnD want to have the 50// mouse event that caused it 51extern GdkEvent *g_lastMouseEvent; 52extern int g_lastButtonNumber; 53 54//---------------------------------------------------------------------------- 55// standard icons 56//---------------------------------------------------------------------------- 57 58/* Copyright (c) Julian Smart */ 59static const char * page_xpm[] = { 60/* columns rows colors chars-per-pixel */ 61"32 32 37 1", 62"5 c #7198D9", 63", c #769CDA", 64"2 c #DCE6F6", 65"i c #FFFFFF", 66"e c #779DDB", 67": c #9AB6E4", 68"9 c #EAF0FA", 69"- c #B1C7EB", 70"$ c #6992D7", 71"y c #F7F9FD", 72"= c #BED0EE", 73"q c #F0F5FC", 74"; c #A8C0E8", 75"@ c #366BC2", 76" c None", 77"u c #FDFEFF", 78"8 c #5987D3", 79"* c #C4D5F0", 80"7 c #7CA0DC", 81"O c #487BCE", 82"< c #6B94D7", 83"& c #CCDAF2", 84"> c #89A9DF", 85"3 c #5584D1", 86"w c #82A5DE", 87"1 c #3F74CB", 88"+ c #3A70CA", 89". c #3569BF", 90"% c #D2DFF4", 91"# c #3366BB", 92"r c #F5F8FD", 93"0 c #FAFCFE", 94"4 c #DFE8F7", 95"X c #5E8AD4", 96"o c #5282D0", 97"t c #B8CCEC", 98"6 c #E5EDF9", 99/* pixels */ 100" ", 101" ", 102" ", 103" ", 104" ", 105" .XXXooOO++@# ", 106" $%&*=-;::>,<1 ", 107" $2%&*=-;::><:3 ", 108" $42%&*=-;::<&:3 ", 109" 56477<<<<8<<9&:X ", 110" 59642%&*=-;<09&:5 ", 111" 5q9642%&*=-<<<<<# ", 112" 5qqw777<<<<<88:>+ ", 113" erqq9642%&*=t;::+ ", 114" eyrqq9642%&*=t;:O ", 115" eyywwww777<<<<t;O ", 116" e0yyrqq9642%&*=to ", 117" e00yyrqq9642%&*=o ", 118" eu0wwwwwww777<&*X ", 119" euu00yyrqq9642%&X ", 120" eiuu00yyrqq9642%X ", 121" eiiwwwwwwwwww742$ ", 122" eiiiuu00yyrqq964$ ", 123" eiiiiuu00yyrqq96$ ", 124" eiiiiiuu00yyrqq95 ", 125" eiiiiiiuu00yyrqq5 ", 126" eeeeeeeeeeeeee55e ", 127" ", 128" ", 129" ", 130" ", 131" " 132}; 133 134 135// ============================================================================ 136// private functions 137// ============================================================================ 138 139// ---------------------------------------------------------------------------- 140// convert between GTK+ and wxWidgets DND constants 141// ---------------------------------------------------------------------------- 142 143static wxDragResult ConvertFromGTK(long action) 144{ 145 switch ( action ) 146 { 147 case GDK_ACTION_COPY: 148 return wxDragCopy; 149 150 case GDK_ACTION_LINK: 151 return wxDragLink; 152 153 case GDK_ACTION_MOVE: 154 return wxDragMove; 155 } 156 157 return wxDragNone; 158} 159 160// ---------------------------------------------------------------------------- 161// "drag_leave" 162// ---------------------------------------------------------------------------- 163 164extern "C" { 165static void target_drag_leave( GtkWidget *WXUNUSED(widget), 166 GdkDragContext *context, 167 guint WXUNUSED(time), 168 wxDropTarget *drop_target ) 169{ 170 if (g_isIdle) wxapp_install_idle_handler(); 171 172 /* inform the wxDropTarget about the current GdkDragContext. 173 this is only valid for the duration of this call */ 174 drop_target->SetDragContext( context ); 175 176 /* we don't need return values. this event is just for 177 information */ 178 drop_target->OnLeave(); 179 180 /* this has to be done because GDK has no "drag_enter" event */ 181 drop_target->m_firstMotion = true; 182 183 /* after this, invalidate the drop_target's GdkDragContext */ 184 drop_target->SetDragContext( (GdkDragContext*) NULL ); 185} 186} 187 188// ---------------------------------------------------------------------------- 189// "drag_motion" 190// ---------------------------------------------------------------------------- 191 192extern "C" { 193static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget), 194 GdkDragContext *context, 195 gint x, 196 gint y, 197 guint time, 198 wxDropTarget *drop_target ) 199{ 200 if (g_isIdle) wxapp_install_idle_handler(); 201 202 /* Owen Taylor: "if the coordinates not in a drop zone, 203 return FALSE, otherwise call gtk_drag_status() and 204 return TRUE" */ 205 206 /* inform the wxDropTarget about the current GdkDragContext. 207 this is only valid for the duration of this call */ 208 drop_target->SetDragContext( context ); 209 210 // GTK+ always supposes that we want to copy the data by default while we 211 // might want to move it, so examine not only suggested_action - which is 212 // only good if we don't have our own preferences - but also the actions 213 // field 214 wxDragResult result; 215 if (drop_target->GetDefaultAction() == wxDragNone) 216 { 217 // use default action set by wxDropSource::DoDragDrop() 218 if ( (gs_flagsForDrag & wxDrag_DefaultMove) == wxDrag_DefaultMove && 219 (context->actions & GDK_ACTION_MOVE ) ) 220 { 221 // move is requested by the program and allowed by GTK+ - do it, even 222 // though suggested_action may be currently wxDragCopy 223 result = wxDragMove; 224 } 225 else // use whatever GTK+ says we should 226 { 227 result = ConvertFromGTK(context->suggested_action); 228 229 if ( (result == wxDragMove) && !(gs_flagsForDrag & wxDrag_AllowMove) ) 230 { 231 // we're requested to move but we can't 232 result = wxDragCopy; 233 } 234 } 235 } 236 else if (drop_target->GetDefaultAction() == wxDragMove && 237 (context->actions & GDK_ACTION_MOVE)) 238 { 239 result = wxDragMove; 240 } 241 else 242 { 243 if (context->actions & GDK_ACTION_COPY) 244 result = wxDragCopy; 245 else if (context->actions & GDK_ACTION_MOVE) 246 result = wxDragMove; 247 else 248 result = wxDragNone; 249 } 250 251 if (drop_target->m_firstMotion) 252 { 253 /* the first "drag_motion" event substitutes a "drag_enter" event */ 254 result = drop_target->OnEnter( x, y, result ); 255 } 256 else 257 { 258 /* give program a chance to react (i.e. to say no by returning FALSE) */ 259 result = drop_target->OnDragOver( x, y, result ); 260 } 261 262 bool ret = wxIsDragResultOk( result ); 263 if (ret) 264 { 265 GdkDragAction action; 266 if (result == wxDragCopy) 267 action = GDK_ACTION_COPY; 268 else if (result == wxDragLink) 269 action = GDK_ACTION_LINK; 270 else 271 action = GDK_ACTION_MOVE; 272 273 gdk_drag_status( context, action, time ); 274 } 275 276 /* after this, invalidate the drop_target's GdkDragContext */ 277 drop_target->SetDragContext( (GdkDragContext*) NULL ); 278 279 /* this has to be done because GDK has no "drag_enter" event */ 280 drop_target->m_firstMotion = false; 281 282 return ret; 283} 284} 285 286// ---------------------------------------------------------------------------- 287// "drag_drop" 288// ---------------------------------------------------------------------------- 289 290extern "C" { 291static gboolean target_drag_drop( GtkWidget *widget, 292 GdkDragContext *context, 293 gint x, 294 gint y, 295 guint time, 296 wxDropTarget *drop_target ) 297{ 298 if (g_isIdle) wxapp_install_idle_handler(); 299 300 /* Owen Taylor: "if the drop is not in a drop zone, 301 return FALSE, otherwise, if you aren't accepting 302 the drop, call gtk_drag_finish() with success == FALSE 303 otherwise call gtk_drag_data_get()" */ 304 305// printf( "drop.\n" ); 306 307 /* this seems to make a difference between not accepting 308 due to wrong target area and due to wrong format. let 309 us hope that this is not required.. */ 310 311 /* inform the wxDropTarget about the current GdkDragContext. 312 this is only valid for the duration of this call */ 313 drop_target->SetDragContext( context ); 314 315 /* inform the wxDropTarget about the current drag widget. 316 this is only valid for the duration of this call */ 317 drop_target->SetDragWidget( widget ); 318 319 /* inform the wxDropTarget about the current drag time. 320 this is only valid for the duration of this call */ 321 drop_target->SetDragTime( time ); 322 323/* 324 wxDragResult result = wxDragMove; 325 if (context->suggested_action == GDK_ACTION_COPY) result = wxDragCopy; 326*/ 327 328 /* reset the block here as someone might very well 329 show a dialog as a reaction to a drop and this 330 wouldn't work without events */ 331 g_blockEventsOnDrag = false; 332 333 bool ret = drop_target->OnDrop( x, y ); 334 335 if (!ret) 336 { 337#ifdef __WXDEBUG__ 338 wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned FALSE") ); 339#endif 340 341 /* cancel the whole thing */ 342 gtk_drag_finish( context, 343 FALSE, /* no success */ 344 FALSE, /* don't delete data on dropping side */ 345 time ); 346 } 347 else 348 { 349#ifdef __WXDEBUG__ 350 wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned true") ); 351#endif 352 353#if wxUSE_THREADS 354 /* disable GUI threads */ 355#endif 356 357 GdkAtom format = drop_target->GetMatchingPair(); 358 359 // this does happen somehow, see bug 555111 360 wxCHECK_MSG( format, FALSE, _T("no matching GdkAtom for format?") ); 361 362/* 363 GdkDragAction action = GDK_ACTION_MOVE; 364 if (result == wxDragCopy) action == GDK_ACTION_COPY; 365 context->action = action; 366*/ 367 /* this should trigger an "drag_data_received" event */ 368 gtk_drag_get_data( widget, 369 context, 370 format, 371 time ); 372 373#if wxUSE_THREADS 374 /* re-enable GUI threads */ 375#endif 376 } 377 378 /* after this, invalidate the drop_target's GdkDragContext */ 379 drop_target->SetDragContext( (GdkDragContext*) NULL ); 380 381 /* after this, invalidate the drop_target's drag widget */ 382 drop_target->SetDragWidget( (GtkWidget*) NULL ); 383 384 /* this has to be done because GDK has no "drag_enter" event */ 385 drop_target->m_firstMotion = true; 386 387 return ret; 388} 389} 390 391// ---------------------------------------------------------------------------- 392// "drag_data_received" 393// ---------------------------------------------------------------------------- 394 395extern "C" { 396static void target_drag_data_received( GtkWidget *WXUNUSED(widget), 397 GdkDragContext *context, 398 gint x, 399 gint y, 400 GtkSelectionData *data, 401 guint WXUNUSED(info), 402 guint time, 403 wxDropTarget *drop_target ) 404{ 405 if (g_isIdle) wxapp_install_idle_handler(); 406 407 /* Owen Taylor: "call gtk_drag_finish() with 408 success == TRUE" */ 409 410 if ((data->length <= 0) || (data->format != 8)) 411 { 412 /* negative data length and non 8-bit data format 413 qualifies for junk */ 414 gtk_drag_finish (context, FALSE, FALSE, time); 415 416 return; 417 } 418 419#ifdef __WXDEBUG__ 420 wxLogTrace(TRACE_DND, wxT( "Drop target: data received event") ); 421#endif 422 423 /* inform the wxDropTarget about the current GtkSelectionData. 424 this is only valid for the duration of this call */ 425 drop_target->SetDragData( data ); 426 427 wxDragResult result = ConvertFromGTK(context->action); 428 429 if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) ) 430 { 431#ifdef __WXDEBUG__ 432 wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned true") ); 433#endif 434 435 /* tell GTK that data transfer was successful */ 436 gtk_drag_finish( context, TRUE, FALSE, time ); 437 } 438 else 439 { 440#ifdef __WXDEBUG__ 441 wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned FALSE") ); 442#endif 443 444 /* tell GTK that data transfer was not successful */ 445 gtk_drag_finish( context, FALSE, FALSE, time ); 446 } 447 448 /* after this, invalidate the drop_target's drag data */ 449 drop_target->SetDragData( (GtkSelectionData*) NULL ); 450} 451} 452 453//---------------------------------------------------------------------------- 454// wxDropTarget 455//---------------------------------------------------------------------------- 456 457wxDropTarget::wxDropTarget( wxDataObject *data ) 458 : wxDropTargetBase( data ) 459{ 460 m_firstMotion = true; 461 m_dragContext = (GdkDragContext*) NULL; 462 m_dragWidget = (GtkWidget*) NULL; 463 m_dragData = (GtkSelectionData*) NULL; 464 m_dragTime = 0; 465} 466 467wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x), 468 wxCoord WXUNUSED(y), 469 wxDragResult def ) 470{ 471 // GetMatchingPair() checks for m_dataObject too, no need to do it here 472 473 // disable the debug message from GetMatchingPair() - there are too many 474 // of them otherwise 475#ifdef __WXDEBUG__ 476 wxLogNull noLog; 477#endif // Debug 478 479 return (GetMatchingPair() != (GdkAtom) 0) ? def : wxDragNone; 480} 481 482bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) ) 483{ 484 if (!m_dataObject) 485 return false; 486 487 return (GetMatchingPair() != (GdkAtom) 0); 488} 489 490wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y), 491 wxDragResult def ) 492{ 493 if (!m_dataObject) 494 return wxDragNone; 495 496 if (GetMatchingPair() == (GdkAtom) 0) 497 return wxDragNone; 498 499 return GetData() ? def : wxDragNone; 500} 501 502GdkAtom wxDropTarget::GetMatchingPair() 503{ 504 if (!m_dataObject) 505 return (GdkAtom) 0; 506 507 if (!m_dragContext) 508 return (GdkAtom) 0; 509 510 GList *child = m_dragContext->targets; 511 while (child) 512 { 513 GdkAtom formatAtom = (GdkAtom)(child->data); 514 wxDataFormat format( formatAtom ); 515 516#ifdef __WXDEBUG__ 517 wxLogTrace(TRACE_DND, wxT("Drop target: drag has format: %s"), 518 format.GetId().c_str()); 519#endif // Debug 520 521 if (m_dataObject->IsSupportedFormat( format )) 522 return formatAtom; 523 524 child = child->next; 525 } 526 527 return (GdkAtom) 0; 528} 529 530bool wxDropTarget::GetData() 531{ 532 if (!m_dragData) 533 return false; 534 535 if (!m_dataObject) 536 return false; 537 538 wxDataFormat dragFormat( m_dragData->target ); 539 540 if (!m_dataObject->IsSupportedFormat( dragFormat )) 541 return false; 542 543 m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data ); 544 545 return true; 546} 547 548void wxDropTarget::UnregisterWidget( GtkWidget *widget ) 549{ 550 wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") ); 551 552 gtk_drag_dest_unset( widget ); 553 554 g_signal_handlers_disconnect_by_func (widget, 555 (gpointer) target_drag_leave, this); 556 g_signal_handlers_disconnect_by_func (widget, 557 (gpointer) target_drag_motion, this); 558 g_signal_handlers_disconnect_by_func (widget, 559 (gpointer) target_drag_drop, this); 560 g_signal_handlers_disconnect_by_func (widget, 561 (gpointer) target_drag_data_received, this); 562} 563 564void wxDropTarget::RegisterWidget( GtkWidget *widget ) 565{ 566 wxCHECK_RET( widget != NULL, wxT("register widget is NULL") ); 567 568 /* gtk_drag_dest_set() determines what default behaviour we'd like 569 GTK to supply. we don't want to specify out targets (=formats) 570 or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and 571 not GTK_DEST_DEFAULT_DROP). instead we react individually to 572 "drag_motion" and "drag_drop" events. this makes it possible 573 to allow dropping on only a small area. we should set 574 GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice 575 highlighting if dragging over standard controls, but this 576 seems to be broken without the other two. */ 577 578 gtk_drag_dest_set( widget, 579 (GtkDestDefaults) 0, /* no default behaviour */ 580 (GtkTargetEntry*) NULL, /* we don't supply any formats here */ 581 0, /* number of targets = 0 */ 582 (GdkDragAction) 0 ); /* we don't supply any actions here */ 583 584 g_signal_connect (widget, "drag_leave", 585 G_CALLBACK (target_drag_leave), this); 586 587 g_signal_connect (widget, "drag_motion", 588 G_CALLBACK (target_drag_motion), this); 589 590 g_signal_connect (widget, "drag_drop", 591 G_CALLBACK (target_drag_drop), this); 592 593 g_signal_connect (widget, "drag_data_received", 594 G_CALLBACK (target_drag_data_received), this); 595} 596 597//---------------------------------------------------------------------------- 598// "drag_data_get" 599//---------------------------------------------------------------------------- 600 601extern "C" { 602static void 603source_drag_data_get (GtkWidget *WXUNUSED(widget), 604 GdkDragContext *WXUNUSED(context), 605 GtkSelectionData *selection_data, 606 guint WXUNUSED(info), 607 guint WXUNUSED(time), 608 wxDropSource *drop_source ) 609{ 610 if (g_isIdle) wxapp_install_idle_handler(); 611 612 wxDataFormat format( selection_data->target ); 613 614#ifdef __WXDEBUG__ 615 wxLogTrace(TRACE_DND, wxT("Drop source: format requested: %s"), 616 format.GetId().c_str()); 617#endif 618 619 drop_source->m_retValue = wxDragCancel; 620 621 wxDataObject *data = drop_source->GetDataObject(); 622 623 if (!data) 624 { 625#ifdef __WXDEBUG__ 626 wxLogTrace(TRACE_DND, wxT("Drop source: no data object") ); 627#endif 628 return; 629 } 630 631 if (!data->IsSupportedFormat(format)) 632 { 633#ifdef __WXDEBUG__ 634 wxLogTrace(TRACE_DND, wxT("Drop source: unsupported format") ); 635#endif 636 return; 637 } 638 639 if (data->GetDataSize(format) == 0) 640 { 641#ifdef __WXDEBUG__ 642 wxLogTrace(TRACE_DND, wxT("Drop source: empty data") ); 643#endif 644 return; 645 } 646 647 size_t size = data->GetDataSize(format); 648 649// printf( "data size: %d.\n", (int)data_size ); 650 651 guchar *d = new guchar[size]; 652 653 if (!data->GetDataHere( format, (void*)d )) 654 { 655 delete[] d; 656 return; 657 } 658 659#if wxUSE_THREADS 660 /* disable GUI threads */ 661#endif 662 663 gtk_selection_data_set( selection_data, 664 selection_data->target, 665 8, // 8-bit 666 d, 667 size ); 668 669#if wxUSE_THREADS 670 /* enable GUI threads */ 671#endif 672 673 delete[] d; 674} 675} 676 677//---------------------------------------------------------------------------- 678// "drag_data_delete" 679//---------------------------------------------------------------------------- 680 681extern "C" { 682static void source_drag_data_delete( GtkWidget *WXUNUSED(widget), 683 GdkDragContext *WXUNUSED(context), 684 wxDropSource *WXUNUSED(drop_source) ) 685{ 686 if (g_isIdle) 687 wxapp_install_idle_handler(); 688 689 // printf( "Drag source: drag_data_delete\n" ); 690} 691} 692 693//---------------------------------------------------------------------------- 694// "drag_begin" 695//---------------------------------------------------------------------------- 696 697extern "C" { 698static void source_drag_begin( GtkWidget *WXUNUSED(widget), 699 GdkDragContext *WXUNUSED(context), 700 wxDropSource *WXUNUSED(drop_source) ) 701{ 702 if (g_isIdle) 703 wxapp_install_idle_handler(); 704 705 // printf( "Drag source: drag_begin.\n" ); 706} 707} 708 709//---------------------------------------------------------------------------- 710// "drag_end" 711//---------------------------------------------------------------------------- 712 713extern "C" { 714static void source_drag_end( GtkWidget *WXUNUSED(widget), 715 GdkDragContext *WXUNUSED(context), 716 wxDropSource *drop_source ) 717{ 718 if (g_isIdle) wxapp_install_idle_handler(); 719 720 // printf( "Drag source: drag_end.\n" ); 721 722 drop_source->m_waiting = false; 723} 724} 725 726//----------------------------------------------------------------------------- 727// "configure_event" from m_iconWindow 728//----------------------------------------------------------------------------- 729 730extern "C" { 731static gint 732gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source ) 733{ 734 // don't need to install idle handler, its done from "event" signal 735 736 source->GiveFeedback( ConvertFromGTK(source->m_dragContext->action) ); 737 738 return 0; 739} 740} 741 742//--------------------------------------------------------------------------- 743// wxDropSource 744//--------------------------------------------------------------------------- 745 746wxDropSource::wxDropSource(wxWindow *win, 747 const wxIcon &iconCopy, 748 const wxIcon &iconMove, 749 const wxIcon &iconNone) 750{ 751 m_waiting = true; 752 753 m_iconWindow = (GtkWidget*) NULL; 754 755 m_window = win; 756 m_widget = win->m_widget; 757 if (win->m_wxwindow) m_widget = win->m_wxwindow; 758 759 m_retValue = wxDragCancel; 760 761 SetIcons(iconCopy, iconMove, iconNone); 762} 763 764wxDropSource::wxDropSource(wxDataObject& data, 765 wxWindow *win, 766 const wxIcon &iconCopy, 767 const wxIcon &iconMove, 768 const wxIcon &iconNone) 769{ 770 m_waiting = true; 771 772 SetData( data ); 773 774 m_iconWindow = (GtkWidget*) NULL; 775 776 m_window = win; 777 m_widget = win->m_widget; 778 if (win->m_wxwindow) m_widget = win->m_wxwindow; 779 780 m_retValue = wxDragCancel; 781 782 SetIcons(iconCopy, iconMove, iconNone); 783} 784 785void wxDropSource::SetIcons(const wxIcon &iconCopy, 786 const wxIcon &iconMove, 787 const wxIcon &iconNone) 788{ 789 m_iconCopy = iconCopy; 790 m_iconMove = iconMove; 791 m_iconNone = iconNone; 792 793 if ( !m_iconCopy.Ok() ) 794 m_iconCopy = wxIcon(page_xpm); 795 if ( !m_iconMove.Ok() ) 796 m_iconMove = m_iconCopy; 797 if ( !m_iconNone.Ok() ) 798 m_iconNone = m_iconCopy; 799} 800 801wxDropSource::~wxDropSource() 802{ 803} 804 805void wxDropSource::PrepareIcon( int action, GdkDragContext *context ) 806{ 807 // get the right icon to display 808 wxIcon *icon = NULL; 809 if ( action & GDK_ACTION_MOVE ) 810 icon = &m_iconMove; 811 else if ( action & GDK_ACTION_COPY ) 812 icon = &m_iconCopy; 813 else 814 icon = &m_iconNone; 815 816 GdkBitmap *mask; 817 if ( icon->GetMask() ) 818 mask = icon->GetMask()->GetBitmap(); 819 else 820 mask = (GdkBitmap *)NULL; 821 822 GdkPixmap *pixmap = icon->GetPixmap(); 823 824 gint width,height; 825 gdk_drawable_get_size (pixmap, &width, &height); 826 827 GdkColormap *colormap = gtk_widget_get_colormap( m_widget ); 828 gtk_widget_push_colormap (colormap); 829 830 m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP); 831 gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK); 832 gtk_widget_set_app_paintable (GTK_WIDGET (m_iconWindow), TRUE); 833 834 gtk_widget_pop_colormap (); 835 836 gtk_widget_set_size_request (m_iconWindow, width, height); 837 gtk_widget_realize (m_iconWindow); 838 839 g_signal_connect (m_iconWindow, "configure_event", 840 G_CALLBACK (gtk_dnd_window_configure_callback), this); 841 842 gdk_window_set_back_pixmap (m_iconWindow->window, pixmap, FALSE); 843 844 if (mask) 845 gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0); 846 847 gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 ); 848} 849 850wxDragResult wxDropSource::DoDragDrop(int flags) 851{ 852 wxCHECK_MSG( m_data && m_data->GetFormatCount(), wxDragNone, 853 wxT("Drop source: no data") ); 854 855 // still in drag 856 if (g_blockEventsOnDrag) 857 return wxDragNone; 858 859 // don't start dragging if no button is down 860 if (g_lastButtonNumber == 0) 861 return wxDragNone; 862 863 // we can only start a drag after a mouse event 864 if (g_lastMouseEvent == NULL) 865 return wxDragNone; 866 867 // disabled for now 868 g_blockEventsOnDrag = true; 869 870 RegisterWindow(); 871 872 m_waiting = true; 873 874 GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 ); 875 876 wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ]; 877 m_data->GetAllFormats( array ); 878 size_t count = m_data->GetFormatCount(); 879 for (size_t i = 0; i < count; i++) 880 { 881 GdkAtom atom = array[i]; 882#ifdef __WXDEBUG__ 883 wxLogTrace(TRACE_DND, wxT("Drop source: Supported atom %s"), gdk_atom_name( atom )); 884#endif 885 gtk_target_list_add( target_list, atom, 0, 0 ); 886 } 887 delete[] array; 888 889 int action = GDK_ACTION_COPY; 890 if ( flags & wxDrag_AllowMove ) 891 action |= GDK_ACTION_MOVE; 892 893 // VZ: as we already use g_blockEventsOnDrag it shouldn't be that bad 894 // to use a global to pass the flags to the drop target but I'd 895 // surely prefer a better way to do it 896 gs_flagsForDrag = flags; 897 898 GdkDragContext *context = gtk_drag_begin( m_widget, 899 target_list, 900 (GdkDragAction)action, 901 g_lastButtonNumber, // number of mouse button which started drag 902 (GdkEvent*) g_lastMouseEvent ); 903 904 if ( !context ) 905 { 906 // this can happen e.g. if gdk_pointer_grab() failed 907 g_blockEventsOnDrag = false; 908 909 UnregisterWindow(); 910 911 return wxDragError; 912 } 913 914 m_dragContext = context; 915 916 PrepareIcon( action, context ); 917 918 while (m_waiting) 919 gtk_main_iteration(); 920 921 m_retValue = ConvertFromGTK(context->action); 922 if ( m_retValue == wxDragNone ) 923 m_retValue = wxDragCancel; 924 925 g_blockEventsOnDrag = false; 926 927 UnregisterWindow(); 928 929 return m_retValue; 930} 931 932void wxDropSource::RegisterWindow() 933{ 934 if (!m_widget) return; 935 936 g_signal_connect (m_widget, "drag_data_get", 937 G_CALLBACK (source_drag_data_get), this); 938 g_signal_connect (m_widget, "drag_data_delete", 939 G_CALLBACK (source_drag_data_delete), this); 940 g_signal_connect (m_widget, "drag_begin", 941 G_CALLBACK (source_drag_begin), this); 942 g_signal_connect (m_widget, "drag_end", 943 G_CALLBACK (source_drag_end), this); 944 945} 946 947void wxDropSource::UnregisterWindow() 948{ 949 if (m_widget) 950 { 951 g_signal_handlers_disconnect_by_func (m_widget, 952 (gpointer) source_drag_data_get, 953 this); 954 g_signal_handlers_disconnect_by_func (m_widget, 955 (gpointer) source_drag_data_delete, 956 this); 957 g_signal_handlers_disconnect_by_func (m_widget, 958 (gpointer) source_drag_begin, 959 this); 960 g_signal_handlers_disconnect_by_func (m_widget, 961 (gpointer) source_drag_end, 962 this); 963 } 964 965 if (m_iconWindow) 966 { 967 g_signal_handlers_disconnect_by_func (m_iconWindow, 968 (gpointer) gtk_dnd_window_configure_callback, this); 969 } 970} 971 972#endif 973 // wxUSE_DRAG_AND_DROP 974