No drop in NSView

Question

Alain_B OP

Created 4w

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Since dragImage: is deprecated I am trying to update drag and drop with beginDraggingSessionWithItems:.

Drag work fine but I cannot get drop to work correctly.

In the code below change #ifndef to #ifdef (using dragImage:) make drop work as expected.

draggingEntered, draggingUpdated, draggingExited, draggingEnded are all called but NOT performDragOperation (which do the drop).

Uncommenting the line

[pb_item pasteboard:paste_board provideDataForType:@"LN_PboardType"];

cause an exceptionPreprocess: -[NSPasteboardItem pasteboard:provideDataForType:]: unrecognized selector sent to instance 0x600001e64240.

I also try add NSDraggingDestination, NSItemProviderWriting, NSPasteboardTypeOwner to @interface line without success.

What I am doing wrong ?

Any other method to do Drag and Drop (other than dragImage: and beginDraggingSessionWithItems:) ?

Where can I found an Obj-C project using beginDraggingSessionWithItems: for drag an drop ?

``@interface Enclosure : NSView <NSDraggingSource, NSPasteboardItemDataProvider>

- (id)initWithFrame:(NSRect)frame
	{
    self = [super initWithFrame:frame];
    if (self)
		{
		[super setAutoresizesSubviews:YES];
		[self registerForDraggedTypes:[NSArray arrayWithObjects:@"LN_PboardType", NSPasteboardTypeString, nil]];
		}

    return self;
	}

- (BOOL)acceptsFirstMouse:(NSEvent *)event
	{
	return YES;
	}

- (void)mouseDown:(NSEvent *)drag_event
	{
	NSImage *drag_image;
	NSPoint drag_position;
	NSRect dragging_rect;
	NSPasteboard *paste_board;
	NSDraggingItem *drag_item;
	NSArray *items_array;
	NSPasteboardItem *pb_item;

	paste_board = [NSPasteboard pasteboardWithName:@"LN_PboardType"];
	[paste_board declareTypes:[NSArray arrayWithObjects:@"LN_PboardType", NSPasteboardTypeString, nil] owner:self];
	pb_item = [[NSPasteboardItem  alloc] init];
	[pb_item setDataProvider:self forTypes:[NSArray arrayWithObjects:@"LN_PboardType", NSPasteboardTypeString, nil]];
//	[pb_item pasteboard:paste_board provideDataForType:@"LN_PboardType"];

	drag_image = [ [NSImage imageNamed:@"drag.jpg"];

	
	drag_position = [self convertPoint:[drag_event locationInWindow] fromView:nil];
	drag_position.x -= drag_image.size.width/2;
	drag_position.y -= drag_image.size.height/2;

	#ifndef DEPRECATED
	[self dragImage:drag_image at:drag_position offset:NSZeroSize event:drag_event pasteboard:paste_board source:self slideBack:YES];
	#else
	drag_item = [[NSDraggingItem alloc] initWithPasteboardWriter:pb_item];
	dragging_rect = NSMakeRect(drag_position.x, drag_position.y, drag_image.size.width, drag_image.size.height);
	[drag_item setDraggingFrame:dragging_rect contents:drag_image];
	items_array = [NSArray arrayWithObject:drag_item];
	[self beginDraggingSessionWithItems:items_array event:drag_event source:(id)self];
	#endif
	}

- (NSDragOperation)draggingSession:(NSDraggingSession *)session sourceOperationMaskForDraggingContext:(NSDraggingContext)context
	{
	if (disable_drag_and_drop)
		return NSDragOperationNone;

    switch (context)
		{
		case NSDraggingContextWithinApplication:
			return NSDragOperationCopy;

		case NSDraggingContextOutsideApplication:
			return NSDragOperationMove;
		}

	return NSDragOperationNone;
	}

…``

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