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:      $Id$
   8 // Copyright:   (c) 1998 Stefan Csomor
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #include "wx/wxprec.h"
  13
  14 #ifndef WX_PRECOMP
  15 #include "wx/object.h"
  16 #endif
  17
  18 #if wxUSE_DRAG_AND_DROP
  19
  20 #include "wx/dnd.h"
  21
  22 #ifndef WX_PRECOMP
  23     #include "wx/app.h"
  24     #include "wx/toplevel.h"
  25     #include "wx/gdicmn.h"
  26     #include "wx/wx.h"
  27 #endif // WX_PRECOMP
  28
  29 #include "wx/evtloop.h"
  30
  31 #include "wx/osx/private.h"
  32
  33 wxDropSource* gCurrentSource = NULL;
  34
  35 wxDragResult NSDragOperationToWxDragResult(NSDragOperation code)
  36 {
  37     switch (code)
  38     {
  39         case NSDragOperationGeneric:
  40             return wxDragCopy;
  41         case NSDragOperationCopy:
  42             return wxDragCopy;
  43         case NSDragOperationMove:
  44             return wxDragMove;
  45         case NSDragOperationLink:
  46             return wxDragLink;
  47         case NSDragOperationNone:
  48             return wxDragNone;
  49         default:
  50             wxFAIL_MSG("Unexpected result code");
  51     }
  52     return wxDragNone;
  53 }
  54
  55 @interface DropSourceDelegate : NSObject
  56 {
  57     BOOL dragFinished;
  58     int resultCode;
  59     wxDropSource* impl;
  60 }
  61
  62 - (void)setImplementation: (wxDropSource *)dropSource;
  63 - (BOOL)finished;
  64 - (NSDragOperation)code;
  65 - (void)draggedImage:(NSImage *)anImage movedTo:(NSPoint)aPoint;
  66 - (void)draggedImage:(NSImage *)anImage endedAt:(NSPoint)aPoint operation:(NSDragOperation)operation;
  67 @end
  68
  69 @implementation DropSourceDelegate
  70
  71 - (id)init
  72 {
  73     self = [super init];
  74     dragFinished = NO;
  75     resultCode = NSDragOperationNone;
  76     impl = 0;
  77     return self;
  78 }
  79
  80 - (void)setImplementation: (wxDropSource *)dropSource
  81 {
  82     impl = dropSource;
  83 }
  84
  85 - (BOOL)finished
  86 {
  87     return dragFinished;
  88 }
  89
  90 - (NSDragOperation)code
  91 {
  92     return resultCode;
  93 }
  94
  95 - (void)draggedImage:(NSImage *)anImage movedTo:(NSPoint)aPoint
  96 {
  97     wxUnusedVar( anImage );
  98     wxUnusedVar( aPoint );
  99
 100     bool optionDown = GetCurrentKeyModifiers() & optionKey;
 101     wxDragResult result = optionDown ? wxDragCopy : wxDragMove;
 102
 103     if (wxDropSource* source = impl)
 104     {
 105         if (!source->GiveFeedback(result))
 106         {
 107             wxStockCursor cursorID = wxCURSOR_NONE;
 108
 109             switch (result)
 110             {
 111                 case wxDragCopy:
 112                     cursorID = wxCURSOR_COPY_ARROW;
 113                     break;
 114
 115                 case wxDragMove:
 116                     cursorID = wxCURSOR_ARROW;
 117                     break;
 118
 119                 case wxDragNone:
 120                     cursorID = wxCURSOR_NO_ENTRY;
 121                     break;
 122
 123                 case wxDragError:
 124                 case wxDragLink:
 125                 case wxDragCancel:
 126                 default:
 127                     // put these here to make gcc happy
 128                     ;
 129             }
 130
 131             if (cursorID != wxCURSOR_NONE)
 132             {
 133                 // TODO under 10.6 the os itself deals with the cursor, remove if things
 134                 // work properly everywhere
 135 #if 0
 136                 wxCursor cursor( cursorID );
 137                 cursor.MacInstall();
 138 #endif
 139             }
 140         }
 141     }
 142 }
 143
 144 - (void)draggedImage:(NSImage *)anImage endedAt:(NSPoint)aPoint operation:(NSDragOperation)operation
 145 {
 146     wxUnusedVar( anImage );
 147     wxUnusedVar( aPoint );
 148
 149     resultCode = operation;
 150     dragFinished = YES;
 151 }
 152
 153 @end
 154
 155 wxDropTarget::wxDropTarget( wxDataObject *data )
 156             : wxDropTargetBase( data )
 157 {
 158
 159 }
 160
 161 //-------------------------------------------------------------------------
 162 // wxDropSource
 163 //-------------------------------------------------------------------------
 164
 165 wxDropSource::wxDropSource(wxWindow *win,
 166                            const wxCursor &cursorCopy,
 167                            const wxCursor &cursorMove,
 168                            const wxCursor &cursorStop)
 169             : wxDropSourceBase(cursorCopy, cursorMove, cursorStop)
 170 {
 171     m_window = win;
 172 }
 173
 174 wxDropSource::wxDropSource(wxDataObject& data,
 175                            wxWindow *win,
 176                            const wxCursor &cursorCopy,
 177                            const wxCursor &cursorMove,
 178                            const wxCursor &cursorStop)
 179             : wxDropSourceBase(cursorCopy, cursorMove, cursorStop)
 180 {
 181     SetData( data );
 182     m_window = win;
 183 }
 184
 185 wxDropSource* wxDropSource::GetCurrentDropSource()
 186 {
 187     return gCurrentSource;
 188 }
 189
 190 wxDragResult wxDropSource::DoDragDrop(int WXUNUSED(flags))
 191 {
 192     wxASSERT_MSG( m_data, wxT("Drop source: no data") );
 193
 194     wxDragResult result = wxDragNone;
 195     if ((m_data == NULL) || (m_data->GetFormatCount() == 0))
 196         return result;
 197
 198     NSView* view = m_window->GetPeer()->GetWXWidget();
 199     if (view)
 200     {
 201         NSPasteboard *pboard;
 202
 203         pboard = [NSPasteboard pasteboardWithName:NSDragPboard];
 204
 205         OSStatus err = noErr;
 206         PasteboardRef pboardRef;
 207         PasteboardCreate((CFStringRef)[pboard name], &pboardRef);
 208
 209         err = PasteboardClear( pboardRef );
 210         if ( err != noErr )
 211         {
 212             CFRelease( pboardRef );
 213             return wxDragNone;
 214         }
 215         PasteboardSynchronize( pboardRef );
 216
 217         m_data->AddToPasteboard( pboardRef, 1 );
 218
 219         NSEvent* theEvent = (NSEvent*)wxTheApp->MacGetCurrentEvent();
 220         wxASSERT_MSG(theEvent, "DoDragDrop must be called in response to a mouse down or drag event.");
 221
 222         NSPoint down = [theEvent locationInWindow];
 223         NSPoint p = [view convertPoint:down fromView:nil];
 224
 225         gCurrentSource = this;
 226
 227         // add a dummy square as dragged image for the moment,
 228         // TODO: proper drag image for data
 229         NSSize sz = NSMakeSize(16,16);
 230         NSRect fillRect = NSMakeRect(0, 0, 16, 16);
 231         NSImage* image = [[NSImage alloc] initWithSize: sz];
 232
 233         [image lockFocus];
 234
 235         [[[NSColor whiteColor] colorWithAlphaComponent:0.8] set];
 236         NSRectFill(fillRect);
 237         [[NSColor blackColor] set];
 238         NSFrameRectWithWidthUsingOperation(fillRect,1.0f,NSCompositeDestinationOver);
 239
 240         [image unlockFocus];
 241
 242
 243         DropSourceDelegate* delegate = [[DropSourceDelegate alloc] init];
 244         [delegate setImplementation: this];
 245         [view dragImage:image at:p offset:NSMakeSize(0.0,0.0)
 246             event: theEvent pasteboard: pboard source:delegate slideBack: NO];
 247
 248         wxEventLoopBase * const loop = wxEventLoop::GetActive();
 249         while ( ![delegate finished] )
 250             loop->Dispatch();
 251
 252         result = NSDragOperationToWxDragResult([delegate code]);
 253         [delegate release];
 254         [image release];
 255
 256         wxWindow* mouseUpTarget = wxWindow::GetCapture();
 257
 258         if ( mouseUpTarget == NULL )
 259         {
 260             mouseUpTarget = m_window;
 261         }
 262
 263         if ( mouseUpTarget != NULL )
 264         {
 265             wxMouseEvent wxevent(wxEVT_LEFT_DOWN);
 266             ((wxWidgetCocoaImpl*)mouseUpTarget->GetPeer())->SetupMouseEvent(wxevent , theEvent) ;
 267             wxevent.SetEventType(wxEVT_LEFT_UP);
 268
 269             mouseUpTarget->HandleWindowEvent(wxevent);
 270         }
 271
 272         gCurrentSource = NULL;
 273     }
 274
 275
 276     return result;
 277 }
 278
 279 #endif // wxUSE_DRAG_AND_DROP
 280