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     return wxDragNone;
  47 }
  48
  49 @interface DropSourceDelegate : NSObject
  50 {
  51     BOOL dragFinished;
  52     int resultCode;
  53     wxDropSource* impl;
  54 }
  55
  56 - (void)setImplementation: (wxDropSource *)dropSource;
  57 - (BOOL)finished;
  58 - (NSDragOperation)code;
  59 - (void)draggedImage:(NSImage *)anImage movedTo:(NSPoint)aPoint;
  60 - (void)draggedImage:(NSImage *)anImage endedAt:(NSPoint)aPoint operation:(NSDragOperation)operation;
  61 @end
  62
  63 @implementation DropSourceDelegate
  64
  65 - (id)init
  66 {
  67     [super init];
  68     dragFinished = NO;
  69     resultCode = NSDragOperationNone;
  70     impl = 0;
  71     return self;
  72 }
  73
  74 - (void)setImplementation: (wxDropSource *)dropSource
  75 {
  76     impl = dropSource;
  77 }
  78
  79 - (BOOL)finished
  80 {
  81     return dragFinished;
  82 }
  83
  84 - (NSDragOperation)code
  85 {
  86     return resultCode;
  87 }
  88
  89 - (void)draggedImage:(NSImage *)anImage movedTo:(NSPoint)aPoint
  90 {
  91     wxUnusedVar( anImage );
  92     wxUnusedVar( aPoint );
  93
  94     bool optionDown = GetCurrentKeyModifiers() & optionKey;
  95     wxDragResult result = optionDown ? wxDragCopy : wxDragMove;
  96
  97     if (wxDropSource* source = impl)
  98     {
  99         if (!source->GiveFeedback(result))
 100         {
 101             wxStockCursor cursorID = wxCURSOR_NONE;
 102
 103             switch (result)
 104             {
 105                 case wxDragCopy:
 106                     cursorID = wxCURSOR_COPY_ARROW;
 107                     break;
 108
 109                 case wxDragMove:
 110                     cursorID = wxCURSOR_ARROW;
 111                     break;
 112
 113                 case wxDragNone:
 114                     cursorID = wxCURSOR_NO_ENTRY;
 115                     break;
 116
 117                 case wxDragError:
 118                 case wxDragLink:
 119                 case wxDragCancel:
 120                 default:
 121                     // put these here to make gcc happy
 122                     ;
 123             }
 124
 125             if (cursorID != wxCURSOR_NONE)
 126             {
 127                 // TODO under 10.6 the os itself deals with the cursor, remove if things
 128                 // work properly everywhere
 129 #if 0
 130                 wxCursor cursor( cursorID );
 131                 cursor.MacInstall();
 132 #endif
 133             }
 134         }
 135     }
 136 }
 137
 138 - (void)draggedImage:(NSImage *)anImage endedAt:(NSPoint)aPoint operation:(NSDragOperation)operation
 139 {
 140     wxUnusedVar( anImage );
 141     wxUnusedVar( aPoint );
 142
 143     resultCode = operation;
 144     dragFinished = YES;
 145 }
 146
 147 @end
 148
 149 wxDropTarget::wxDropTarget( wxDataObject *data )
 150             : wxDropTargetBase( data )
 151 {
 152
 153 }
 154
 155 //-------------------------------------------------------------------------
 156 // wxDropSource
 157 //-------------------------------------------------------------------------
 158
 159 wxDropSource::wxDropSource(wxWindow *win,
 160                            const wxCursor &cursorCopy,
 161                            const wxCursor &cursorMove,
 162                            const wxCursor &cursorStop)
 163             : wxDropSourceBase(cursorCopy, cursorMove, cursorStop)
 164 {
 165     m_window = win;
 166 }
 167
 168 wxDropSource::wxDropSource(wxDataObject& data,
 169                            wxWindow *win,
 170                            const wxCursor &cursorCopy,
 171                            const wxCursor &cursorMove,
 172                            const wxCursor &cursorStop)
 173             : wxDropSourceBase(cursorCopy, cursorMove, cursorStop)
 174 {
 175     SetData( data );
 176     m_window = win;
 177 }
 178
 179 wxDropSource* wxDropSource::GetCurrentDropSource()
 180 {
 181     return gCurrentSource;
 182 }
 183
 184 wxDragResult wxDropSource::DoDragDrop(int WXUNUSED(flags))
 185 {
 186     wxASSERT_MSG( m_data, wxT("Drop source: no data") );
 187
 188     wxDragResult result = wxDragNone;
 189     if ((m_data == NULL) || (m_data->GetFormatCount() == 0))
 190         return result;
 191
 192     NSView* view = m_window->GetPeer()->GetWXWidget();
 193     if (view)
 194     {
 195         NSPasteboard *pboard;
 196
 197         pboard = [NSPasteboard pasteboardWithName:NSDragPboard];
 198
 199         OSStatus err = noErr;
 200         PasteboardRef pboardRef;
 201         PasteboardCreate((CFStringRef)[pboard name], &pboardRef);
 202
 203         err = PasteboardClear( pboardRef );
 204         if ( err != noErr )
 205         {
 206             CFRelease( pboardRef );
 207             return wxDragNone;
 208         }
 209         PasteboardSynchronize( pboardRef );
 210
 211         m_data->AddToPasteboard( pboardRef, 1 );
 212
 213         NSEvent* theEvent = (NSEvent*)wxTheApp->MacGetCurrentEvent();
 214         wxASSERT_MSG(theEvent, "DoDragDrop must be called in response to a mouse down or drag event.");
 215
 216         NSPoint down = [theEvent locationInWindow];
 217         NSPoint p = [view convertPoint:down toView:nil];
 218
 219         gCurrentSource = this;
 220
 221         // add a dummy square as dragged image for the moment,
 222         // TODO: proper drag image for data
 223         NSSize sz = NSMakeSize(16,16);
 224         NSRect fillRect = NSMakeRect(0, 0, 16, 16);
 225         NSImage* image = [[NSImage alloc] initWithSize: sz];
 226
 227         [image lockFocus];
 228
 229         [[[NSColor whiteColor] colorWithAlphaComponent:0.8] set];
 230         NSRectFill(fillRect);
 231         [[NSColor blackColor] set];
 232         NSFrameRectWithWidthUsingOperation(fillRect,1.0f,NSCompositeDestinationOver);
 233
 234         [image unlockFocus];
 235
 236
 237         DropSourceDelegate* delegate = [[DropSourceDelegate alloc] init];
 238         [delegate setImplementation: this];
 239         [view dragImage:image at:p offset:NSMakeSize(0.0,0.0)
 240             event: theEvent pasteboard: pboard source:delegate slideBack: NO];
 241
 242         wxEventLoopBase * const loop = wxEventLoop::GetActive();
 243         while ( ![delegate finished] )
 244             loop->Dispatch();
 245
 246         result = NSDragOperationToWxDragResult([delegate code]);
 247         [delegate release];
 248         [image release];
 249         gCurrentSource = NULL;
 250     }
 251
 252
 253     return result;
 254 }
 255
 256 #endif // wxUSE_DRAG_AND_DROP
 257