cog/Playlist/DNDArrayController.m

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Matlab
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2005-06-02 18:16:43 +00:00
#import "DNDArrayController.h"
@implementation DNDArrayController
NSString *MovedRowsType = @"MOVED_ROWS_TYPE";
- (void)awakeFromNib
{
// register for drag and drop
// DBLog(@"AWOKE");
[tableView registerForDraggedTypes:[NSArray arrayWithObjects:MovedRowsType, NSFilenamesPboardType, nil]];
// [tableView setVerticalMotionCanBeginDrag:YES];
// [tableView setAllowsMultipleSelection:NO];
// [super awakeFromNib];
// DBLog(@"HERE: %@", [tableView registeredDraggedTypes]);
}
- (BOOL)tableView:(NSTableView *)tv
writeRows:(NSArray*)rows
toPasteboard:(NSPasteboard*)pboard
{
// DBLog(@"WRITE ROWS");
NSData *data;
data = [NSKeyedArchiver archivedDataWithRootObject:rows];
[pboard declareTypes: [NSArray arrayWithObjects:MovedRowsType, nil] owner:self];
[pboard setData: data forType: MovedRowsType];
return YES;
}
- (NSDragOperation)tableView:(NSTableView*)tv
validateDrop:(id <NSDraggingInfo>)info
proposedRow:(int)row
proposedDropOperation:(NSTableViewDropOperation)op
{
NSDragOperation dragOp = NSDragOperationCopy;
// DBLog(@"VALIDATING");
if ([info draggingSource] == tv)
dragOp = NSDragOperationMove;
// we want to put the object at, not over,
// the current row (contrast NSTableViewDropOn)
[tv setDropRow:row dropOperation:NSTableViewDropAbove];
return dragOp;
}
- (BOOL)tableView:(NSTableView*)tv
acceptDrop:(id <NSDraggingInfo>)info
row:(int)row
dropOperation:(NSTableViewDropOperation)op
{
if (row < 0)
{
row = 0;
}
// DBLog(@"ACCEPTATING");
// if drag source is self, it's a move
if ([info draggingSource] == tableView)
{
// DBLog(@"ACCEPTATED");
NSArray *rows = [NSKeyedUnarchiver unarchiveObjectWithData:[[info draggingPasteboard] dataForType: MovedRowsType]];
NSIndexSet *indexSet = [self indexSetFromRows:rows];
[self moveObjectsInArrangedObjectsFromIndexes:indexSet toIndex:row];
// set selected rows to those that were just moved
// Need to work out what moved where to determine proper selection...
int rowsAbove = [self rowsAboveRow:row inIndexSet:indexSet];
NSRange range = NSMakeRange(row - rowsAbove, [indexSet count]);
indexSet = [NSIndexSet indexSetWithIndexesInRange:range];
[self setSelectionIndexes:indexSet];
return YES;
}
return NO;
}
-(void) moveObjectsInArrangedObjectsFromIndexes:(NSIndexSet*)indexSet
toIndex:(unsigned int)insertIndex
{
NSArray *objects = [self arrangedObjects];
int index = [indexSet lastIndex];
int aboveInsertIndexCount = 0;
id object;
int removeIndex;
while (NSNotFound != index)
{
if (index >= insertIndex) {
removeIndex = index + aboveInsertIndexCount;
aboveInsertIndexCount += 1;
}
else
{
removeIndex = index;
insertIndex -= 1;
}
object = [objects objectAtIndex:removeIndex];
[self removeObjectAtArrangedObjectIndex:removeIndex];
[self insertObject:object atArrangedObjectIndex:insertIndex];
index = [indexSet indexLessThanIndex:index];
}
}
- (NSIndexSet *)indexSetFromRows:(NSArray *)rows
{
NSMutableIndexSet *indexSet = [NSMutableIndexSet indexSet];
NSEnumerator *rowEnumerator = [rows objectEnumerator];
NSNumber *idx;
while (idx = [rowEnumerator nextObject])
{
[indexSet addIndex:[idx unsignedIntValue]];
}
return indexSet;
}
- (int)rowsAboveRow:(int)row inIndexSet:(NSIndexSet *)indexSet
{
unsigned currentIndex = [indexSet firstIndex];
int i = 0;
while (currentIndex != NSNotFound)
{
if (currentIndex < row) { i++; }
currentIndex = [indexSet indexGreaterThanIndex:currentIndex];
}
return i;
}
@end