Source/DraggableImageView.m

   1 /*
   2  * PrintDrop
   3  * Copyright (c) 2008, Blue Static <http://www.bluestatic.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it under the terms of the GNU
   6  * General Public License as published by the Free Software Foundation; either version 2 of the
   7  * License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
  10  * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with this program; if not,
  14  * write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
  15  */
  16
  17 #import "DraggableImageView.h"
  18
  19
  20 @implementation DraggableImageView
  21
  22 /**
  23  * Register drag types
  24  */
  25 - (void)awakeFromNib
  26 {
  27         [self registerForDraggedTypes:[NSArray arrayWithObject:NSFilenamesPboardType]];
  28 }
  29
  30 /**
  31  * Dealloc
  32  */
  33 - (void)dealloc
  34 {
  35         if (filePath != nil)
  36         {
  37                 [filePath release];
  38         }
  39         [super dealloc];
  40 }
  41
  42 /**
  43  * We're starting to drag; check and see if it's a valid type
  44  */
  45 - (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender
  46 {
  47         NSPasteboard *pboard = [sender draggingPasteboard];
  48         NSDragOperation opMask = [sender draggingSourceOperationMask];
  49
  50         if ([[pboard types] containsObject:NSFilenamesPboardType] && (opMask & NSDragOperationCopy))
  51         {
  52                 NSString *file = [[pboard propertyListForType:NSFilenamesPboardType] objectAtIndex:0];
  53                 if ([[[file substringFromIndex:[file length] - 4] lowercaseString] isEqualToString: @".pdf"])
  54                 {
  55                         return NSDragOperationCopy;
  56                 }
  57         }
  58
  59         return NSDragOperationNone;
  60 }
  61
  62 /**
  63  * Dragging performed, set the image and filename
  64  */
  65 - (BOOL)performDragOperation:(id <NSDraggingInfo>)sender
  66 {
  67         if ([self draggingEntered:sender] == NSDragOperationCopy)
  68         {
  69                 NSString *path = [[[sender draggingPasteboard] propertyListForType:NSFilenamesPboardType] objectAtIndex:0];
  70
  71                 if (filePath != nil)
  72                 {
  73                         [filePath release];
  74                 }
  75                 filePath = [path retain];
  76
  77                 NSFileWrapper *fw = [[NSFileWrapper alloc] initWithPath:filePath];
  78                 [self setImage:[fw icon]];
  79                 [fw release];
  80
  81                 return YES;
  82         }
  83         return NO;
  84 }
  85
  86 @end