Retired Document
Important: This sample code may not represent best practices for current development. The project may use deprecated symbols and illustrate technologies and techniques that are no longer recommended.
DMKArrayController.m
/* |
File: DMKArrayController.m |
Abstract: An array controller subclass to manage a collection of text snippets, including support for drag and drop. |
Version: 1.1 |
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*/ |
#import "DMKArrayController.h" |
#import "EditController.h" |
#import "MyDocument.h" |
#import "Step.h" |
NSString *MovedRowsUTI = @"com.yourcompany.demomonkey.movedrows"; |
@implementation DMKArrayController |
@synthesize tableView, windowController; |
#pragma mark - |
#pragma mark Pasteboard / drag and drop support |
- (void)awakeFromNib { |
// Register the table view for drag and drop. |
[tableView registerForDraggedTypes:[NSArray arrayWithObjects:StepUTI, MovedRowsUTI, NSStringPboardType, nil]]; |
[tableView setAllowsMultipleSelection:YES]; |
[tableView setDraggingSourceOperationMask:NSDragOperationCopy forLocal:NO]; |
} |
- (BOOL)tableView:(NSTableView *)tv writeRowsWithIndexes:(NSIndexSet *)rowIndexes toPasteboard:(NSPasteboard*)pboard { |
/* |
Take ownership of the pasteboard, then: |
* Write the currently-selected steps directly; |
* Archive the selection index set and write the archive to the pasteboard as the data for the moved rows type. The index set is used in tableView:acceptDrop:row:dropOperation: if there is a reorder operation within a table view. |
*/ |
[pboard clearContents]; |
// Write the current steps. |
[pboard writeObjects:[[self arrangedObjects] objectsAtIndexes:rowIndexes]]; |
// Add rows array for a local move. |
[pboard addTypes:[NSArray arrayWithObject:MovedRowsUTI] owner:self]; |
NSData *rowIndexesData = [NSArchiver archivedDataWithRootObject:rowIndexes]; |
[pboard setData:rowIndexesData forType:MovedRowsUTI]; |
return YES; |
} |
- (NSDragOperation)tableView:(NSTableView *)aTableView validateDrop:(id < NSDraggingInfo >)info proposedRow:(NSInteger)row proposedDropOperation:(NSTableViewDropOperation)operation { |
NSDragOperation dragOp = NSDragOperationCopy; |
// If drag source is self, it's a move. |
if ([info draggingSource] == tableView) { |
dragOp = NSDragOperationMove; |
} |
// Put the object at, not over, the current row (contrast NSTableViewDropOn). |
if ([[self arrangedObjects] count] > 0) { |
[aTableView setDropRow:row dropOperation:NSTableViewDropAbove]; |
} |
return dragOp; |
} |
- (BOOL)tableView:(NSTableView *)aTableView acceptDrop:(id < NSDraggingInfo >)info row:(NSInteger)row dropOperation:(NSTableViewDropOperation)operation { |
if (row < 0) { |
row = 0; |
} |
/* |
If the dragging source is our table view, look for the moved rows type for a reorder operation. |
*/ |
if ([info draggingSource] == tableView) { |
NSData *rowsData = [[info draggingPasteboard] dataForType:MovedRowsUTI]; |
NSIndexSet *indexSet = [NSUnarchiver unarchiveObjectWithData:rowsData]; |
[self moveObjectsInArrangedObjectsFromIndexes:indexSet toIndex:row]; |
/* |
Set the selected rows to those that were just moved. Work out what moved where to determine proper selection. |
*/ |
NSInteger rowsAbove = [self rowsAboveRow:row inIndexSet:indexSet]; |
NSRange range = NSMakeRange(row - rowsAbove, [indexSet count]); |
indexSet = [NSIndexSet indexSetWithIndexesInRange:range]; |
[self setSelectionIndexes:indexSet]; |
return YES; |
} |
/* |
If the dragging source is something other than our table view, create new steps from whatever's on the pasteboard and add them. |
*/ |
NSDictionary *options = [NSDictionary dictionary]; |
NSArray *newSteps = [[info draggingPasteboard] readObjectsForClasses:[NSArray arrayWithObject:[Step class]] options:options]; |
if (newSteps == nil) { |
return NO; |
} |
NSRange insertionRange = NSMakeRange(row, [newSteps count]); |
NSIndexSet *insertionIndexes = [NSIndexSet indexSetWithIndexesInRange:insertionRange]; |
[self insertObjects:newSteps atArrangedObjectIndexes:insertionIndexes]; |
return YES; |
} |
#pragma mark - |
#pragma mark New objects |
- (id)newObject { |
// Configure a new object. |
Step *newObject = [super newObject]; |
NSUInteger row = [[self arrangedObjects] count]; |
newObject.tableSummary = [NSString stringWithFormat:@"Step %d", (row +1)]; |
newObject.undoManager = [[windowController document] undoManager]; |
return newObject; |
} |
- (void)add:sender { |
// Add a new object, then select its row. |
Step *newObject = [super newObject]; |
NSUInteger row = [[self arrangedObjects] count]; |
[self insertObject:newObject atArrangedObjectIndex:row]; |
[tableView selectRowIndexes:[NSIndexSet indexSetWithIndex:row] byExtendingSelection:NO]; |
[tableView editColumn:0 row:row withEvent:nil select:YES]; |
[newObject release]; |
} |
#pragma mark - |
#pragma mark Reorder operation |
-(void) moveObjectsInArrangedObjectsFromIndexes:(NSIndexSet*)indexSet toIndex:(NSUInteger)insertIndex { |
NSArray *objects = [self arrangedObjects]; |
NSInteger idx = [indexSet lastIndex]; |
NSInteger aboveInsertIndexCount = 0; |
id object = nil; |
NSInteger removeIndex; |
while (NSNotFound != idx) { |
if (idx >= insertIndex) { |
removeIndex = idx + aboveInsertIndexCount; |
aboveInsertIndexCount += 1; |
} |
else { |
removeIndex = idx; |
insertIndex -= 1; |
} |
object = [[objects objectAtIndex:removeIndex] retain]; |
[self removeObjectAtArrangedObjectIndex:removeIndex]; |
[self insertObject:object atArrangedObjectIndex:insertIndex]; |
[object release]; |
idx = [indexSet indexLessThanIndex:idx]; |
} |
} |
- (NSInteger)rowsAboveRow:(NSInteger)row inIndexSet:(NSIndexSet *)indexSet { |
NSUInteger currentIndex = [indexSet firstIndex]; |
NSInteger i = 0; |
while (currentIndex != NSNotFound) { |
if (currentIndex < row) { i++; } |
currentIndex = [indexSet indexGreaterThanIndex:currentIndex]; |
} |
return i; |
} |
@end |
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