NSTableView + Cocoa Bindings + Core Data + Drag & Drop. HMDT Makoto Kinoshita

Transcription

1 NSTableView + Cocoa Bindings + Core Data + Drag & Drop HMDT Makoto Kinoshita

2 NSTableView + Cocoa Bindings binding content NSArrayController NSMutableArray

3 NSTableView + Cocoa Bindings + Core Data binding managedobjectcontext NSMutableSet mutablesetforkey NSArrayController delegate Core Data

4 Array or Set NSArray has order NSSet has NO ORDER Table view uses order!

5 Not Ordered Data

6 Ordered Data

7 Drag And Drop writerows:topasteboard: date source paste board acceptdrop:row:dropoperation

8 What We Need Core Data model with ordering Copy managed objects to a pasteboard

9 Example Model Entity Name: Mail Attributes: to (String) title (String) from (String)

10 Type 1. Add An Attribute For Ordering New Attributes: order (Int32)

11 NSSortDescriptor key: order ascending: YES selector: compare: Sort By Order

12 Dragging Core Data 1. Write to pboard request NSArrayController date source 2. Get selected managed objects paste board 3. Copy data for managed objects

13 and Dropping 7. Refresh view 6. Update order values date source Core Data 5. Get data from the persistent coordinator NSArrayController 4. Read data paste board

14 Get NSArrayController - (BOOL)tableView:(NSTableView*)tableView writerows:(nsarray*)rows topasteboard:(nspasteboard*)pboard { // Get array controller NSDictionary* bindinginfo; NSArrayController* arraycontroller; bindinginfo = [tableview infoforbinding:nscontentbinding]; arraycontroller = [bindinginfo valueforkey:nsobservedobjectkey];

15 Get Managed Objects Data // Get arranged objects, they are managed object NSArray* arrangedobjects; arrangedobjects = [arraycontroller arrangedobjects]; // Collect URI representation of managed objects NSMutableArray* objecturis; NSEnumerator* enumerator; NSNumber* rownumber; objecturis = [NSMutableArray array]; enumerator = [rows objectenumerator]; while (rownumber = [enumerator nextobject]) { int row = [rownumber intvalue]; if (row >= [arrangedobjects count]) { continue; } // Get URI representation of managed object NSManagedObject* object; NSManagedObjectID* objectid; NSURL* objecturi; object = [arrangedobjects objectatindex:row]; objectid = [object objectid]; objecturi = [objectid URIRepresentation]; } [objecturis addobject:objecturi];

16 URI Representation x-coredata://2d1e267f A7E A35/Mail/p109

17 Get With URI Representation // Get managed object context and persistent store coordinator NSManagedObjectContext* context; NSPersistentStoreCoordinator* coordinator; context = [self managedobjectcontext]; coordinator = [context persistentstorecoordinator]; // Collect manged objects with URIs NSMutableArray* managedobjects; NSEnumerator* enumerator; NSURL* objecturi; managedobjects = [NSMutableArray array]; enumerator = [objecturis objectenumerator]; while (objecturi = [enumerator nextobject]) { // Get managed object NSManagedObjectID* objectid; NSManagedObject* object; objectid = [coordinator managedobjectidforurirepresentation:objecturi]; object = [context objectwithid:objectid]; if (!object) { continue; } } [managedobjects addobject:object];

18 Re-order // Get managed objects NSMutableArray* objects; objects = [NSMutableArray arraywitharray:[arraycontroller arrangedobjects]]; if (!objects [objects count] == 0) { return NO; } // Replace dragged objects with null objects as placeholder enumerator = [draggedobjects objectenumerator]; while (object = [enumerator nextobject]) { int index; index = [objects indexofobject:object]; if (index == NSNotFound) { // Error NSLog(@"Not found dragged link in links"); continue; } [objects replaceobjectatindex:index withobject:[nsnull null]]; } // Insert dragged objects at row if (row < [objects count]) { [objects insertobjects:draggedobjects atindexes:[nsindexset indexsetwithindexesinrange:nsmakerange(row, [draggedobjects count])]]; } else { [objects addobjectsfromarray:draggedobjects]; } // Remove null objeccts [objects removeobject:[nsnull null]]; // Re-order objects int i; for (i = 0; i < [objects count]; i++) { object = [objects objectatindex:i]; [object setvalue:[nsnumber numberwithint:i] forkey:@"order"]; } // Reload data [arraycontroller rearrangeobjects];

19 Problem

20 Type 2. Add An Entity For Ordering

21 Solution

22 Mail Addition - (void)add:(id)sender { // Create and insert Mail NSManagedObject* mail; mail = [NSEntityDescription insertnewobjectforentityforname:@"mail" inmanagedobjectcontext:[self managedobjectcontext]]; // Create and insert Order NSManagedObject* order; order = [NSEntityDescription insertnewobjectforentityforname:@"order" inmanagedobjectcontext:[self managedobjectcontext]]; // Set order to mail [mail setvalue:order forkey:@"order"]; }

23 Demo