src/osx/cocoa/dnd.mm

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/osx/cocoa/dnd.mm
   3 // Purpose:     wxDropTarget, wxDropSource implementations
   4 // Author:      Stefan Csomor
   5 // Modified by:
   6 // Created:     1998-01-01
   7 // RCS-ID:      $Id: dnd.cpp 61724 2009-08-21 10:41:26Z VZ $
   8 // Copyright:   (c) 1998 Stefan Csomor
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #include "wx/wxprec.h"
  13
  14 #if wxUSE_DRAG_AND_DROP
  15
  16 #include "wx/dnd.h"
  17
  18 #ifndef WX_PRECOMP
  19     #include "wx/app.h"
  20     #include "wx/evtloop.h"
  21     #include "wx/toplevel.h"
  22     #include "wx/gdicmn.h"
  23     #include "wx/wx.h"
  24 #endif // WX_PRECOMP
  25
  26 #include <AppKit/AppKit.h>
  27 #include "wx/osx/private.h"
  28
  29 wxDropSource* gCurrentSource = NULL;
  30
  31 wxDragResult NSDragOperationToWxDragResult(NSDragOperation code)
  32 {
  33     switch (code)
  34     {
  35         case NSDragOperationCopy:
  36             return wxDragCopy;
  37         case NSDragOperationMove:
  38             return wxDragMove;
  39         case NSDragOperationLink:
  40             return wxDragLink;
  41         case NSDragOperationNone:
  42             return wxDragNone;
  43         default:
  44             wxFAIL_MSG("Unexpected result code");
  45     }
  46 }
  47
  48 @interface DropSourceDelegate : NSObject
  49 {
  50     BOOL dragFinished;
  51     int resultCode;
  52     wxDropSource* impl;
  53 }
  54
  55 - (void)setImplementation: (wxDropSource *)dropSource;
  56 - (BOOL)finished;
  57 - (NSDragOperation)code;
  58 - (void)draggedImage:(NSImage *)anImage movedTo:(NSPoint)aPoint;
  59 - (void)draggedImage:(NSImage *)anImage endedAt:(NSPoint)aPoint operation:(NSDragOperation)operation;
  60 @end
  61
  62 @implementation DropSourceDelegate
  63
  64 - (id)init
  65 {
  66     [super init];
  67     dragFinished = NO;
  68     resultCode = NSDragOperationNone;
  69     impl = 0;
  70     return self;
  71 }
  72
  73 - (void)setImplementation: (wxDropSource *)dropSource
  74 {
  75     impl = dropSource;
  76 }
  77
  78 - (BOOL)finished
  79 {
  80     return dragFinished;
  81 }
  82
  83 - (NSDragOperation)code
  84 {
  85     return resultCode;
  86 }
  87
  88 - (void)draggedImage:(NSImage *)anImage movedTo:(NSPoint)aPoint
  89 {
  90     bool optionDown = GetCurrentKeyModifiers() & optionKey;
  91     wxDragResult result = optionDown ? wxDragCopy : wxDragMove;
  92
  93     if (wxDropSource* source = impl)
  94     {
  95         if (!source->GiveFeedback(result))
  96         {
  97             wxStockCursor cursorID = wxCURSOR_NONE;
  98
  99             switch (result)
 100             {
 101                 case wxDragCopy:
 102                     cursorID = wxCURSOR_COPY_ARROW;
 103                     break;
 104
 105                 case wxDragMove:
 106                     cursorID = wxCURSOR_ARROW;
 107                     break;
 108
 109                 case wxDragNone:
 110                     cursorID = wxCURSOR_NO_ENTRY;
 111                     break;
 112
 113                 case wxDragError:
 114                 case wxDragLink:
 115                 case wxDragCancel:
 116                 default:
 117                     // put these here to make gcc happy
 118                     ;
 119             }
 120
 121             if (cursorID != wxCURSOR_NONE)
 122             {
 123                 wxCursor cursor( cursorID );
 124                 cursor.MacInstall();
 125             }
 126         }
 127     }
 128 }
 129
 130 - (void)draggedImage:(NSImage *)anImage endedAt:(NSPoint)aPoint operation:(NSDragOperation)operation
 131 {
 132     resultCode = operation;
 133     dragFinished = YES;
 134 }
 135
 136 @end
 137
 138 wxDropTarget::wxDropTarget( wxDataObject *data )
 139             : wxDropTargetBase( data )
 140 {
 141
 142 }
 143
 144 //-------------------------------------------------------------------------
 145 // wxDropSource
 146 //-------------------------------------------------------------------------
 147
 148 wxDropSource::wxDropSource(wxWindow *win,
 149                            const wxCursor &cursorCopy,
 150                            const wxCursor &cursorMove,
 151                            const wxCursor &cursorStop)
 152             : wxDropSourceBase(cursorCopy, cursorMove, cursorStop)
 153 {
 154     m_window = win;
 155 }
 156
 157 wxDropSource::wxDropSource(wxDataObject& data,
 158                            wxWindow *win,
 159                            const wxCursor &cursorCopy,
 160                            const wxCursor &cursorMove,
 161                            const wxCursor &cursorStop)
 162             : wxDropSourceBase(cursorCopy, cursorMove, cursorStop)
 163 {
 164     SetData( data );
 165     m_window = win;
 166 }
 167
 168 wxDropSource* wxDropSource::GetCurrentDropSource()
 169 {
 170     return gCurrentSource;
 171 }
 172
 173 wxDragResult wxDropSource::DoDragDrop(int flags)
 174 {
 175     wxASSERT_MSG( m_data, wxT("Drop source: no data") );
 176
 177     wxDragResult result = wxDragNone;
 178     if ((m_data == NULL) || (m_data->GetFormatCount() == 0))
 179         return result;
 180
 181     NSView* view = m_window->GetPeer()->GetWXWidget();
 182     if (view)
 183     {
 184         NSPasteboard *pboard;
 185
 186         pboard = [NSPasteboard pasteboardWithName:NSDragPboard];
 187
 188         OSStatus err = noErr;
 189         PasteboardRef pboardRef;
 190         PasteboardCreate((CFStringRef)[pboard name], &pboardRef);
 191
 192         err = PasteboardClear( pboardRef );
 193         if ( err != noErr )
 194         {
 195             CFRelease( pboardRef );
 196             return wxDragNone;
 197         }
 198         PasteboardSynchronize( pboardRef );
 199
 200         m_data->AddToPasteboard( pboardRef, 1 );
 201
 202         NSEvent* theEvent = (NSEvent*)wxTheApp->MacGetCurrentEvent();
 203         wxASSERT_MSG(theEvent, "DoDragDrop must be called in response to a mouse down or drag event.");
 204
 205         gCurrentSource = this;
 206         NSImage* image = [[NSImage alloc] initWithSize: NSMakeSize(16,16)];
 207         DropSourceDelegate* delegate = [[DropSourceDelegate alloc] init];
 208         [delegate setImplementation: this];
 209         [view dragImage:image at:NSMakePoint(0.0, 16.0) offset:NSMakeSize(0.0,0.0)
 210             event: theEvent pasteboard: pboard source:delegate slideBack: NO];
 211
 212         wxEventLoopBase * const loop = wxEventLoop::GetActive();
 213         while ( ![delegate finished] )
 214             loop->Dispatch();
 215
 216         result = NSDragOperationToWxDragResult([delegate code]);
 217         [delegate release];
 218         [image release];
 219         gCurrentSource = NULL;
 220     }
 221
 222
 223     return result;
 224 }
 225
 226 #endif // wxUSE_DRAG_AND_DROP
 227