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.
CroppingImageView.m
// |
// CroppingImageView.m |
// Cropped Image |
// |
// Created by jcr on Tue Jul 16 2002. |
// Copyright (c) 2002 Apple Computer, Inc. All rights reserved. |
// |
#import "CroppingImageView.h" |
#import "CropMarker.h" |
#import "FinderStyleCropMarker.h" |
#import "IPhotoStyleCropMarker.h" |
#import "LassoStyleCropMarker.h" |
enum |
{ |
plainMarkerStyle, // Simple rectangle |
finderMarkerStyle, // Rectangle bordered with a solid color, and its interior is tinted. |
iPhotoMarkerStyle, // Area outside the rectangle is tinted. |
lassoMarkerStyle // Path is stroked, and filled with a tint. |
}; |
NSString *selectionChangedNotification = @"ImageSelectionChanged"; |
@implementation NSImageCell (CroppingImageView) |
- (NSRect) rectCoveredByImageInBounds:(NSRect) bounds |
// This is a work-around to deal with the fact that NSImageCell won't tell me the rectangle *actually* covered by its image, but NSCell will. |
{ |
return [super imageRectForBounds:bounds]; |
} |
@end |
@implementation CroppingImageView |
- (IBAction) takeSelectionMarkerStyleFrom:sender |
// I should probably check to see if this call is a No-Op. As it is, whenever this is called, I discard the existing CropMarker, and create a new one. |
{ |
NSRect stash = [selectionMarker selectedRect]; // If we change styles, it's nice to keep the same area selected. |
switch ([[sender selectedCell] tag]) |
{ |
case plainMarkerStyle: |
[self setSelectionMarker:[CropMarker cropMarkerForView:self]]; |
[selectionMarker setSelectedRect:stash]; |
break; |
case finderMarkerStyle: |
[self setSelectionMarker:[FinderStyleCropMarker cropMarkerForView:self]]; |
[selectionMarker setSelectedRect:stash]; |
break; |
case iPhotoMarkerStyle: |
[self setSelectionMarker:[IPhotoStyleCropMarker cropMarkerForView:self]]; |
[selectionMarker setSelectedRect:stash]; |
break; |
case lassoMarkerStyle: |
[self setSelectionMarker:[LassoStyleCropMarker cropMarkerForView:self]]; |
break; |
} |
[self setNeedsDisplay:YES]; |
} |
- (void)drawRect:(NSRect)rect |
{ |
[super drawRect:rect]; |
[selectionMarker drawCropMarker]; |
} |
// NSResponder methods. For the most part, the events are just punted to the CropMarker. |
- (void) mouseDown:(NSEvent *) theEvent { [selectionMarker mouseDown:theEvent]; } |
- (void) mouseUp:(NSEvent *) theEvent |
{ |
[selectionMarker mouseUp:theEvent]; |
[self selectionChanged]; |
[self postSelectionChangedNotification]; // This is how the controller knows to redraw the second NSImageView. |
} |
- (void) mouseDragged:(NSEvent *) theEvent |
{ |
[selectionMarker mouseDragged:theEvent]; |
if ([self isContinuous]) |
[self postSelectionChangedNotification]; |
[self selectionChanged]; |
} |
- (void) selectionChanged { [self setNeedsDisplay:YES]; } |
- (void) postSelectionChangedNotification |
{ |
[[NSNotificationCenter defaultCenter] postNotificationName:selectionChangedNotification object:self]; |
} |
- (NSImage *) croppedImage |
// Returns an autoreleased NSImage, consisting of the selected portion of the reciever's image. |
// If there's no selection, this method will return the original image. |
{ |
NSRect |
sourceImageRect = [[self cell] rectCoveredByImageInBounds:[self bounds]], |
newImageBounds = NSIntersectionRect([selectionMarker selectedRect], sourceImageRect); |
if (!NSIsEmptyRect(newImageBounds)) |
{ |
NSImage |
*newImage = [[NSImage alloc] initWithSize:sourceImageRect.size]; |
NSAffineTransform |
*pathAdjustment = [NSAffineTransform transform]; |
NSBezierPath |
*croppingPath = [selectionMarker selectedPath]; |
[pathAdjustment translateXBy: -NSMinX(sourceImageRect) yBy: -NSMinY(sourceImageRect)]; |
croppingPath = [pathAdjustment transformBezierPath:[selectionMarker selectedPath]]; |
[newImage lockFocus]; |
if (!shouldAntiAlias) |
[[NSGraphicsContext currentContext] setShouldAntialias:NO]; |
[[NSColor blackColor] set]; |
[croppingPath fill]; |
[[self image] compositeToPoint:NSZeroPoint operation:NSCompositeSourceIn]; |
[newImage unlockFocus]; |
return [newImage autorelease]; |
} |
return [self image]; |
} |
// Accessors.. |
- (void) setSelectionMarker: marker // Should be a CropMarker or a subclass thereof, but I'm not in the mood for strong typing.. |
{ |
[marker retain]; |
[selectionMarker release]; |
selectionMarker = marker; |
} |
- (IBAction) takeSelectionColorFrom:sender |
{ |
[selectionMarker setColor:[sender color]]; |
[self setNeedsDisplay:YES]; |
} |
- (IBAction) takeAntiAliasModeFrom:sender |
{ |
shouldAntiAlias = [sender intValue]; |
[self postSelectionChangedNotification]; |
} |
- (IBAction) takeContinuousModeFrom:sender { [self setContinuous:[sender intValue]]; } |
@end |
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