Multiple controllers accessing the same model object?!

Question

Hi all,
I have a rather simple but really fundamental question. I am implementing an application which
communicates with a camera. My application main window is controlled by "MyController" class,
which has a "Camera" object "myCam" and a "capture" button. I would like to add "continuous
capture" functionality. I have subclassed NSButton(CameraCaptureButton class) and set in IB
the identity of the button. In the new class I have also the methods mouseUp/mouseDown which
are properly working. The problem now is how to send messages to "myCam" from CameraCaptureButton class. There is some sample code(mine is much more complex but I will extract only the part that I am interested in):
//CameraCaptureButton.h
#import "CameraCaptureButton.h"
#import "MyController.h"
@implementation CameraCaptureButton
- (id)initWithFrame:(NSRect)frame
self = [super initWithFrame:frame];
if (self)
// Initialization code here.
return self;
- (void) mouseDown:(NSEvent *)theEvent
//some pictures which are also set correctly
NSImage* buttonDown = [NSImage imageNamed:@"ReleaseFpsButtonDown.png"];
[self setImage:buttonDown];
NSLog(@"capture button down");
- (void) mouseUp:(NSEvent *)theEvent
//some pictures which are also set correctly
NSImage* button = [NSImage imageNamed:@"ReleaseFpsButtonOn.png"];
[self setImage:button];
NSLog(@"capture button up");
@end
//MyController.h
#import <Cocoa/Cocoa.h>
#import "Camera.h"
@interface MyController : NSWindowController
Camera* myCam;
Thank you in advance for any post!

Answer 1

The functionality is implemented and working. Ray if you read this: Thank you! Below I post the most important parts of my code, I will appreciate any comments or suggestions for better implementation( for example should I 'retain' the camera object in the setter method or is it already retain by the call in the header file?!)!
// MyController.h
#import "Camera.h"
@interface MyController : NSWindowController
/*some mode definitions*/
Camera* leCamera;
/*some more definitions*/
@property (nonatomic, retain) Camera *leCamera;
/*some more methods and properties*/
@end
// MyController.m
#import "MyController.h"
@implementation MyController
- (id)init
if (self = [super init])
Camera* cam = [[Camera alloc] init];
[self setLeCamera: cam];
...some more code...
return self;
-(void) setLeCamera: (Camera*) cam
leCamera = cam;
- (Camera*) leCamera
return leCamera;
@end
// CameraCaptureButton.m
#import "CameraCaptureButton.h"
#import "MyController.h"
#import "Camera.h"
@implementation CameraCaptureButton
- (id)initWithFrame:(NSRect)frame
self = [super initWithFrame:frame];
if (self)
return self;
- (void) mouseDown:(NSEvent *)theEvent
NSImage* buttonDown = [NSImage imageNamed:@"ReleaseFpsButtonDown.png"];
[self setImage:buttonDown];
MyController *delegate = [[NSApplication sharedApplication] delegate];
Camera* cam = delegate.leCamera;
int driveMode = [[cam camProp] driveMode];
if(driveMode == 1)
[cam releaseCam: 12];
else
[cam releaseCam: 0];
- (void) mouseUp:(NSEvent *)theEvent
NSImage* button = [NSImage imageNamed:@"ReleaseFpsButtonOn.png"];
[self setImage:button];
MyController *delegate = [[NSApplication sharedApplication] delegate];
Camera* cam = delegate.leCamera;
int driveMode = [[cam camProp] driveMode];
if(driveMode == 1)
[cam releaseCam: 13];
@end
Have fun!
Regards
- artOf...
P.S. the mouseUp/down events seem to track by default the mouse, so when I am over the
button and push it, it does as expected. Same for mouseUp, even if I hold the button pushed,
drag the mouse outside my application and then release it I get the mouseUp event which is
great I had so many problems in the .NET version with that