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FDImageView.m
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FDImageView.m
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/*
File: FDImageView.m
Contains: Drag and Drop with ImageView
Author: eK
Copyright (C) 2004-2008 Eddie Kelley <eddie@kelleycomputing.net>
This file is part of FreeDMG
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Change History (most recent first):
02/2005 1.2 Changed drag operation to copy.
04/2004 1.1 Modified by Eddie Kelley for use with FreeDMG program
01/2002 initial version - Concepts from Apple sample source code
*/
#import "FDImageView.h"
#import "FDController.h"
@implementation FDImageView
-(void) awakeFromNib{
}
- (id)initWithCoder:(NSCoder *)coder
{
/*------------------------------------------------------
Init method called for Interface Builder objects
--------------------------------------------------------*/
if(self=[super initWithCoder:coder]){
[super setEditable:FALSE];
//register for all the image types we can display
[self registerForDraggedTypes:[NSArray arrayWithObjects: NSFilenamesPboardType, nil]];
}
return self;
}
#pragma mark Destination Operations
//Destination Operations
- (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender
{
/*------------------------------------------------------
method called whenever a drag enters our drop zone
--------------------------------------------------------*/
// Check if the pasteboard contains image data and source/user wants it copied
if (NSDragOperationCopy) {
highlight=YES;//highlight our drop zone
[self setImage:[NSImage imageNamed:@"FreeDMG_largeMask.png"]];
[self setNeedsDisplay: YES];
return NSDragOperationCopy; //accept data as a copy operation
}
return NSDragOperationNone;
}
- (void)draggingExited:(id <NSDraggingInfo>)sender
{
/*------------------------------------------------------
method called whenever a drag exits our drop zone
--------------------------------------------------------*/
highlight=NO;//remove highlight of the drop zone
[self setImage:[NSImage imageNamed:@"FreeDMG_large.png"]];
[self setNeedsDisplay: YES];
}
-(void)drawRect:(NSRect)rect
{
/*------------------------------------------------------
draw method is overridden to do drop highlighing
--------------------------------------------------------*/
[super drawRect:rect];//do the usual draw operation to display the default image
if(highlight){
//highlight by overlaying a gray border
[[NSColor grayColor] set];
[NSBezierPath setDefaultLineWidth: 5];
[NSBezierPath strokeRect: rect];
}
}
- (BOOL)prepareForDragOperation:(id <NSDraggingInfo>)sender
{
/*------------------------------------------------------
method to determine if we can accept the drop
--------------------------------------------------------*/
highlight=NO;//finished with the drag so remove any highlighting
[self setImage:[NSImage imageNamed:@"FreeDMG_large.png"]];
[self setNeedsDisplay: YES];
//just accept the data
return NSDragOperationCopy;
}
- (BOOL)performDragOperation:(id <NSDraggingInfo>)sender
{
/*------------------------------------------------------
method that should handle the drop data
--------------------------------------------------------*/
if([sender draggingSource] != self){
// Get the drag-n-drop pasteboard
NSPasteboard *myPasteboard=[sender draggingPasteboard];
// set the view's drop array to equal the pasteboard's
dropArray = [myPasteboard propertyListForType:NSFilenamesPboardType];
}
return YES;
}
-(void)concludeDragOperation:(id <NSDraggingInfo>)sender
{
[self setImage:[NSImage imageNamed:@"FreeDMG_large.png"]];
[self sendAction:[self action] to:[self target]];
}
- (BOOL)acceptsFirstMouse:(NSEvent *)event {
/*------------------------------------------------------
accept activation click as click in window
--------------------------------------------------------*/
[self setNeedsDisplay:YES];
return YES;//so source doesn't have to be the active window
}
#pragma mark Data Accessors
- (NSArray*) dropArray{
/*------------------------------------------------------
return the dropArray object
--------------------------------------------------------*/
NSArray * passArray = [NSArray arrayWithArray:dropArray];
return passArray;
}
@end