Quote from Forum Archives on May 17, 2013, 9:25 pm

Posted by: svanvoorst <svanvoorst@...>

For those interested, the following demo is an 'all objc' version of Bernie's hybrid code (part FB, part objc), recently published on the FBList.  Thanks for showing us, Bernie.  It differs in that a special view is not used to mark a 'drop' on the window; instead the background color of the window is changed so that there is visual confirmation.  A window delegate handles the drag and drop event.

'------------ start ---------

include "FBLog.incl"

BeginCDeclaration

@interface WndDelegate:NSObject <NSWindowDelegate>

{

  NSWindow *window;

  NSColor *wndBkgrndColor;

  BOOL dragInside;

}

@property (retain) NSWindow *window;

@property (retain) NSColor *wndBkgrndColor;

@end

EndC

BeginCFunction

@implementation WndDelegate

@synthesize window;

@synthesize wndBkgrndColor;

- (NSDragOperation)draggingEntered:(id < NSDraggingInfo >)sender

{

   NSPasteboard *pboard = [sender draggingPasteboard];

   if ( [[pboard types] containsObject:NSFilenamesPboardType] ) 

    {

      dragInside = YES;

      [window setBackgroundColor:[NSColor whiteColor]];

       return NSDragOperationLink;

    }

    return NSDragOperationNone; 

}

- (void)draggingExited:(id < NSDraggingInfo >)sender

{

  dragInside = NO;

  [window setBackgroundColor:wndBkgrndColor];

}

- (BOOL)performDragOperation:(id < NSDraggingInfo >)sender

{

   NSPasteboard *pboard = [sender draggingPasteboard];

   if ([[pboard types] containsObject:NSFilenamesPboardType])

   {

     NSArray *files = [pboard propertyListForType:NSFilenamesPboardType];

     NSLog(@"file: %@", files);

     [self draggingExited:sender];

     return YES;

   }

  return NO;

}

- (BOOL)prepareForDragOperation:(id < NSDraggingInfo >)sender

{

  return YES;

}

- (BOOL)windowShouldClose:(id)sender

{

  return YES;

}

@end

EndC

BeginCDeclaration

@interface AppDelegate : NSObject

{

  NSWindow *window;

  WndDelegate *wndDelegate;

}

- (void) createMenu;

- (void) createWindow;

@end

EndC

BeginCFunction

@implementation AppDelegate

- (void) dealloc

{

  [wndDelegate release];

  [window release];

  [super dealloc];

}

- (void) createMenu

{

// ******** Menu and menubar ********//

  id menubar = [[NSMenu new] autorelease];

  id appMenuItem = [[NSMenuItem new] autorelease];

  [menubar addItem:appMenuItem];

  [NSApp setMainMenu:menubar];

  id appMenu = [[NSMenu new] autorelease];

  id quitMenuItem = [[[NSMenuItem alloc] initWithTitle:@"Quit"

        action:@selector(terminate:) keyEquivalent:@"q"] autorelease];

  [appMenu addItem:quitMenuItem];

  [appMenuItem setSubmenu:appMenu];

}

- (void) createWindow

{

  // ***** Window ***** //

  #define _wndW  300

  #define _wndH  150

  window = [[NSWindow alloc] initWithContentRect: NSMakeRect( 0, 0, _wndW, _wndH )

                       styleMask: NSTitledWindowMask | NSMiniaturizableWindowMask | NSClosableWindowMask

                       backing: NSBackingStoreBuffered

                       defer: NO];

  [window center];

  [window setTitle: @"DragNDrop Window"];

  NSColor *wndBkgrndColor = [window backgroundColor];  

  wndDelegate = [[WndDelegate alloc] init];

  [wndDelegate setWindow:window];

  [wndDelegate setWndBkgrndColor:wndBkgrndColor];

  [window registerForDraggedTypes:[NSArray arrayWithObjects:NSFilenamesPboardType, nil]];

  [window setDelegate:wndDelegate];

}

- (void) applicationWillFinishLaunching: (NSNotification *)notification

{

  [self createMenu];

  [self createWindow];

}

- (void) applicationDidFinishLaunching: (NSNotification *)notification

{

  [window makeKeyAndOrderFront: nil];

}

@end

EndC

BeginCCode

  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc]init];

  [NSApplication sharedApplication];

  AppDelegate *myDelegate = [[[AppDelegate alloc] init]autorelease];

  [NSApp setDelegate: myDelegate];

  [NSApp run];

  [pool drain];

EndC

'-------- end ----------

Steve Van Voorst

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