TransactionsController_Dragging.m
/* |
File: TransactionsController_Dragging.m |
Abstract: This category implements tableView data source methods to support dragging. |
Version: 1.2 |
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple |
Inc. ("Apple") in consideration of your agreement to the following |
terms, and your use, installation, modification or redistribution of |
this Apple software constitutes acceptance of these terms. If you do |
not agree with these terms, please do not use, install, modify or |
redistribute this Apple software. |
In consideration of your agreement to abide by the following terms, and |
subject to these terms, Apple grants you a personal, non-exclusive |
license, under Apple's copyrights in this original Apple software (the |
"Apple Software"), to use, reproduce, modify and redistribute the Apple |
Software, with or without modifications, in source and/or binary forms; |
provided that if you redistribute the Apple Software in its entirety and |
without modifications, you must retain this notice and the following |
text and disclaimers in all such redistributions of the Apple Software. |
Neither the name, trademarks, service marks or logos of Apple Inc. may |
be used to endorse or promote products derived from the Apple Software |
without specific prior written permission from Apple. Except as |
expressly stated in this notice, no other rights or licenses, express or |
implied, are granted by Apple herein, including but not limited to any |
patent rights that may be infringed by your derivative works or by other |
works in which the Apple Software may be incorporated. |
The Apple Software is provided by Apple on an "AS IS" basis. APPLE |
MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION |
THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS |
FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND |
OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS. |
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL |
OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, |
MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED |
AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE), |
STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE |
POSSIBILITY OF SUCH DAMAGE. |
Copyright (C) 2012 Apple Inc. All Rights Reserved. |
*/ |
#import "TransactionsController.h" |
#import "MyDocument_Pasteboard.h" |
@implementation TransactionsController(Dragging) |
/* Preliminary registration */ |
- (void)awakeFromNib { |
[_transactionTable registerForDraggedTypes:[_document readablePasteboardTypes]]; |
[_transactionTable setDraggingSourceOperationMask:(NSDragOperationCopy|NSDragOperationGeneric) forLocal:YES]; |
[_transactionTable setDraggingSourceOperationMask:(NSDragOperationCopy|NSDragOperationGeneric) forLocal:NO]; |
} |
/* Data source methods for dragging out */ |
- (BOOL)tableView:(NSTableView *)tv writeRowsWithIndexes:(NSIndexSet *)rowIndexes toPasteboard:(NSPasteboard *)pboard { |
// This method will be called before the start of a drag out |
BOOL result = NO; |
if (NSNotFound != [rowIndexes firstIndex]) { |
// We ask the document to write out the selected transactions plus a file promise to the pasteboard |
[self setSelectionIndexes:rowIndexes]; |
result = [_document writeSelectionToPasteboard:pboard types:[_document writablePasteboardTypes]]; |
} |
return result; |
} |
- (NSArray *)tableView:(NSTableView *)tv namesOfPromisedFilesDroppedAtDestination:(NSURL *)dropDestination forDraggedRowsWithIndexes:(NSIndexSet *)rowIndexes { |
// This method will be called if we need to redeem our file promise |
NSURL *fileURL = nil; |
if (dropDestination && NSNotFound != [rowIndexes firstIndex]) { |
// We ask the document to write out the selected transactions to a file in the specified directory |
[self setSelectionIndexes:rowIndexes]; |
fileURL = [_document writeSelectionToDestination:dropDestination]; |
} |
return (fileURL ? [NSArray arrayWithObject:[[fileURL path] lastPathComponent]] : nil); |
} |
/* Data source methods for dragging in */ |
- (NSDragOperation)tableView:(NSTableView *)tv validateDrop:(id <NSDraggingInfo>)info proposedRow:(NSInteger)row proposedDropOperation:(NSTableViewDropOperation)op { |
// This method will be called repeatedly during a drag in, to validate it and to determine the operation type and drop location |
NSDragOperation result = NSDragOperationNone, mask = [info draggingSourceOperationMask]; |
NSArray *availableTypes = [[info draggingPasteboard] types], *readableTypes = [_document readablePasteboardTypes]; |
NSEnumerator *enumerator = [readableTypes objectEnumerator]; |
NSString *type; |
// We always copy, but if source and destination are the same, then we do not accept the drag unless the user explicitly chooses copy |
if (tv != [info draggingSource] || 0 == (mask & NSDragOperationGeneric)) { |
while (result == NSDragOperationNone && (type = [enumerator nextObject])) { |
// In any case, we accept the drag only if the pasteboard contains one of our desired types |
if ([availableTypes containsObject:type]) { |
// We always place the drop after the last existing row |
[tv setDropRow:[tv numberOfRows] dropOperation:NSTableViewDropAbove]; |
result = NSDragOperationCopy; |
} |
} |
} |
return result; |
} |
- (BOOL)tableView:(NSTableView *)tv acceptDrop:(id <NSDraggingInfo>)info row:(NSInteger)row dropOperation:(NSTableViewDropOperation)op { |
// This method will be called when a drag in is finally dropped on our table view |
return [_document readSelectionFromPasteboard:[info draggingPasteboard]]; |
} |
@end |
Copyright © 2012 Apple Inc. All Rights Reserved. Terms of Use | Privacy Policy | Updated: 2012-06-07