{"id":21,"date":"2005-07-29T05:44:00","date_gmt":"2005-07-29T09:44:00","guid":{"rendered":""},"modified":"2018-10-31T10:16:18","modified_gmt":"2018-10-31T17:16:18","slug":"drag-and-drop-in-an-nstableview","status":"publish","type":"post","link":"https:\/\/www.corbinstreehouse.com\/blog\/2005\/07\/drag-and-drop-in-an-nstableview\/","title":{"rendered":"Drag and Drop in an NSTableView"},"content":{"rendered":"

\n

Drag and Drop in an NSTableView is easy to do. However, I think the documentation (Table Views: Using Drag and Drop in Tables<\/a>) for it isn’t particularly great. It misses a few points, so I’m going to go over the basic steps on how to add drag and drop to your TableView. Here, I’ll assume you have a TableView with your source code controller class set as the delegate.<\/p>\n

Declare your custom pasteboard format:<\/p>\n

#define BasicTableViewDragAndDropDataType @\u00e2\u20ac\u0153BasicTableViewDragAndDropDataType\u00e2\u20ac\u009d<\/font><\/p>\n

In awakeFromNib you must register for the drag types you want to receive (you could have others here):<\/p>\n

– (<\/font>void<\/font>)awakeFromNib {<\/font><\/p>\n

\u00c2\u00a0 \u00c2\u00a0 <\/span>[myTableView registerForDraggedTypes:[NSArray arrayWithObjects:BasicTableViewDragAndDropDataType, <\/font>nil<\/font>]];<\/font><\/p>\n

}<\/font><\/p>\n

Then, you must implement writeRowsWithIndexes to add your data to the pasteboard:<\/p>\n

– (<\/font>BOOL<\/font>)tableView:(NSTableView *)tv writeRowsWithIndexes:(NSIndexSet *)rowIndexes toPasteboard:(NSPasteboard*)pboard {<\/font><\/p>\n

\u00c2\u00a0 \u00c2\u00a0 <\/span><\/font>\/\/ Drag and drop support<\/font><\/p>\n

\u00c2\u00a0 \u00c2\u00a0 <\/span>NSData *data = [NSKeyedArchiver archivedDataWithRootObject:rowIndexes];<\/font><\/p>\n

\u00c2\u00a0 \u00c2\u00a0 <\/span>[pboard declareTypes:[NSArray arrayWithObject:BasicTableViewDragAndDropDataType] owner:<\/font>self<\/font>];<\/font><\/p>\n

\u00c2\u00a0 \u00c2\u00a0 <\/span>[pboard setData:data forType:BasicTableViewDragAndDropDataType];<\/font><\/p>\n

\u00c2\u00a0 \u00c2\u00a0 <\/span><\/font>return<\/font> <\/font>YES<\/font>;<\/font><\/p>\n

}<\/font><\/p>\n

Next you will validate the drop:<\/p>\n

– (NSDragOperation)tableView:(NSTableView*)tv validateDrop:(<\/font>id<\/font> )info proposedRow:(<\/nsdragginginfo><\/font>int<\/font>)row proposedDropOperation:(NSTableViewDropOperation)op {<\/font><\/p>\n

\u00c2\u00a0 \u00c2\u00a0 <\/span><\/font>\/\/ Add code here to validate the drop<\/font><\/p>\n

\u00c2\u00a0 \u00c2\u00a0 <\/span>NSLog(<\/font>@\u00e2\u20ac\u0153validate Drop\u00e2\u20ac\u009d<\/font>);<\/font><\/p>\n

\u00c2\u00a0 \u00c2\u00a0 <\/span><\/font>return<\/font> NSDragOperationEvery; \u00c2\u00a0 \u00c2\u00a0<\/span><\/font><\/p>\n

}<\/font><\/p>\n

Finally, you must have a method that accepts the drop. Here you could access the BasicTableViewDragAndDropDataType and look at the rows that were dragged.<\/p>\n

– (<\/font>BOOL<\/font>)tableView:(NSTableView*)tv acceptDrop:(<\/font>id<\/font> )info row:(<\/nsdragginginfo><\/font>int<\/font>)row dropOperation:(NSTableViewDropOperation)op {<\/font><\/p>\n

\u00c2\u00a0 \u00c2\u00a0 <\/span>NSLog(<\/font>@\u00e2\u20ac\u0153acceptDrop\u00e2\u20ac\u009d<\/font>);<\/font><\/p>\n

\u00c2\u00a0 \u00c2\u00a0 <\/span><\/font>\/\/ Add code here to accept the drop<\/font><\/p>\n

\u00c2\u00a0 \u00c2\u00a0 <\/span><\/font>return<\/font> <\/font>YES<\/font>; \u00c2\u00a0 \u00c2\u00a0<\/span><\/font><\/p>\n

}<\/font><\/p>\n

And that is it! It is pretty easy…<\/p>\n

<\/p>\n

Technorati Tags: Cocoa<\/a><\/p>\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

Drag and Drop in an NSTableView is easy to do. However, I think the documentation (Table Views: Using Drag and Drop in Tables) for it isn’t particularly great. It misses a few points, so I’m… [read more]<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[6,1],"tags":[63,130,72],"class_list":["post-21","post","type-post","status-publish","format-standard","hentry","category-cocoa","category-general","tag-cocoa","tag-objc","tag-programming"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.corbinstreehouse.com\/blog\/wp-json\/wp\/v2\/posts\/21","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.corbinstreehouse.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.corbinstreehouse.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.corbinstreehouse.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.corbinstreehouse.com\/blog\/wp-json\/wp\/v2\/comments?post=21"}],"version-history":[{"count":1,"href":"https:\/\/www.corbinstreehouse.com\/blog\/wp-json\/wp\/v2\/posts\/21\/revisions"}],"predecessor-version":[{"id":5337,"href":"https:\/\/www.corbinstreehouse.com\/blog\/wp-json\/wp\/v2\/posts\/21\/revisions\/5337"}],"wp:attachment":[{"href":"https:\/\/www.corbinstreehouse.com\/blog\/wp-json\/wp\/v2\/media?parent=21"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.corbinstreehouse.com\/blog\/wp-json\/wp\/v2\/categories?post=21"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.corbinstreehouse.com\/blog\/wp-json\/wp\/v2\/tags?post=21"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}