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/toplevel.h"
  21     #include "wx/gdicmn.h"
  22     #include "wx/wx.h"
  23 #endif // WX_PRECOMP
  24
  25 #include "wx/evtloop.h"
  26
  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     wxUnusedVar( anImage );
  91     wxUnusedVar( aPoint );
  92
  93     bool optionDown = GetCurrentKeyModifiers() & optionKey;
  94     wxDragResult result = optionDown ? wxDragCopy : wxDragMove;
  95
  96     if (wxDropSource* source = impl)
  97     {
  98         if (!source->GiveFeedback(result))
  99         {
 100             wxStockCursor cursorID = wxCURSOR_NONE;
 101
 102             switch (result)
 103             {
 104                 case wxDragCopy:
 105                     cursorID = wxCURSOR_COPY_ARROW;
 106                     break;
 107
 108                 case wxDragMove:
 109                     cursorID = wxCURSOR_ARROW;
 110                     break;
 111
 112                 case wxDragNone:
 113                     cursorID = wxCURSOR_NO_ENTRY;
 114                     break;
 115
 116                 case wxDragError:
 117                 case wxDragLink:
 118                 case wxDragCancel:
 119                 default:
 120                     // put these here to make gcc happy
 121                     ;
 122             }
 123
 124             if (cursorID != wxCURSOR_NONE)
 125             {
 126                 // TODO under 10.6 the os itself deals with the cursor, remove if things
 127                 // work properly everywhere
 128 #if 0
 129                 wxCursor cursor( cursorID );
 130                 cursor.MacInstall();
 131 #endif
 132             }
 133         }
 134     }
 135 }
 136
 137 - (void)draggedImage:(NSImage *)anImage endedAt:(NSPoint)aPoint operation:(NSDragOperation)operation
 138 {
 139     wxUnusedVar( anImage );
 140     wxUnusedVar( aPoint );
 141
 142     resultCode = operation;
 143     dragFinished = YES;
 144 }
 145
 146 @end
 147
 148 wxDropTarget::wxDropTarget( wxDataObject *data )
 149             : wxDropTargetBase( data )
 150 {
 151
 152 }
 153
 154 //-------------------------------------------------------------------------
 155 // wxDropSource
 156 //-------------------------------------------------------------------------
 157
 158 wxDropSource::wxDropSource(wxWindow *win,
 159                            const wxCursor &cursorCopy,
 160                            const wxCursor &cursorMove,
 161                            const wxCursor &cursorStop)
 162             : wxDropSourceBase(cursorCopy, cursorMove, cursorStop)
 163 {
 164     m_window = win;
 165 }
 166
 167 wxDropSource::wxDropSource(wxDataObject& data,
 168                            wxWindow *win,
 169                            const wxCursor &cursorCopy,
 170                            const wxCursor &cursorMove,
 171                            const wxCursor &cursorStop)
 172             : wxDropSourceBase(cursorCopy, cursorMove, cursorStop)
 173 {
 174     SetData( data );
 175     m_window = win;
 176 }
 177
 178 wxDropSource* wxDropSource::GetCurrentDropSource()
 179 {
 180     return gCurrentSource;
 181 }
 182
 183 wxDragResult wxDropSource::DoDragDrop(int WXUNUSED(flags))
 184 {
 185     wxASSERT_MSG( m_data, wxT("Drop source: no data") );
 186
 187     wxDragResult result = wxDragNone;
 188     if ((m_data == NULL) || (m_data->GetFormatCount() == 0))
 189         return result;
 190
 191     NSView* view = m_window->GetPeer()->GetWXWidget();
 192     if (view)
 193     {
 194         NSPasteboard *pboard;
 195
 196         pboard = [NSPasteboard pasteboardWithName:NSDragPboard];
 197
 198         OSStatus err = noErr;
 199         PasteboardRef pboardRef;
 200         PasteboardCreate((CFStringRef)[pboard name], &pboardRef);
 201
 202         err = PasteboardClear( pboardRef );
 203         if ( err != noErr )
 204         {
 205             CFRelease( pboardRef );
 206             return wxDragNone;
 207         }
 208         PasteboardSynchronize( pboardRef );
 209
 210         m_data->AddToPasteboard( pboardRef, 1 );
 211
 212         NSEvent* theEvent = (NSEvent*)wxTheApp->MacGetCurrentEvent();
 213         wxASSERT_MSG(theEvent, "DoDragDrop must be called in response to a mouse down or drag event.");
 214
 215         NSPoint down = [theEvent locationInWindow];
 216         NSPoint p = [view convertPoint:down toView:nil];
 217
 218         gCurrentSource = this;
 219
 220         // add a dummy square as dragged image for the moment,
 221         // TODO: proper drag image for data
 222         NSSize sz = NSMakeSize(16,16);
 223         NSRect fillRect = NSMakeRect(0, 0, 16, 16);
 224         NSImage* image = [[NSImage alloc] initWithSize: sz];
 225
 226         [image lockFocus];
 227
 228         [[[NSColor whiteColor] colorWithAlphaComponent:0.8] set];
 229         NSRectFill(fillRect);
 230         [[NSColor blackColor] set];
 231         NSFrameRectWithWidthUsingOperation(fillRect,1.0f,NSCompositeDestinationOver);
 232
 233         [image unlockFocus];
 234
 235
 236         DropSourceDelegate* delegate = [[DropSourceDelegate alloc] init];
 237         [delegate setImplementation: this];
 238         [view dragImage:image at:p offset:NSMakeSize(0.0,0.0)
 239             event: theEvent pasteboard: pboard source:delegate slideBack: NO];
 240
 241         wxEventLoopBase * const loop = wxEventLoop::GetActive();
 242         while ( ![delegate finished] )
 243             loop->Dispatch();
 244
 245         result = NSDragOperationToWxDragResult([delegate code]);
 246         [delegate release];
 247         [image release];
 248         gCurrentSource = NULL;
 249     }
 250
 251
 252     return result;
 253 }
 254
 255 #endif // wxUSE_DRAG_AND_DROP
 256