Question

I’ve been searching for answers to this question and while I have done the steps I still cannot seem to get the mouseDown method to be called.
What I want is when the user clicks and holds down on the image, it should print out “Mouse down!”.
(Eventually what I want to do is the user to click and hold on the image to cause a sound to play, and when they let go the sound will stop).

Here’s what I have. My header:

@interface MyNSImageView : NSImageView <NSImageDelegate> {
}
@end

And my class:

@implementation MyNSImageView

- (void)mouseDown:(NSEvent *)event {

     if ([[self target] respondsToSelector:[self action]]) {
     [NSApp sendAction:[self action] to:[self target] from:self];
     }
    NSLog(@"Mouse Down!");
}

@end

Does this look right? If so, then are there other problems which might be interfering with it? Of not, what should I do?

Thanks heaps!

Answer 1

First thought: Try implementing acceptsFirstResponder and return yes. Then have your delegate set the first responder to the image view….

UPDATE:

So, I just created a new project, and added a class MyClass to it, which inherits from NSImageView. mouseDown is implemented:

-(void)mouseDown:(NSEvent *)theEvent
{
NSLog(@"Mouse Down");
}

and initWithFrame is implemented:

- (id)initWithFrame:(NSRect)frameRect
{
    self = [super initWithFrame:frameRect];
    if (self) {
        NSURL *newURL = [[NSBundle mainBundle] URLForImageResource:@"ARandomImageIAddedtoProject"];
        NSImage *newImage = [[NSImage alloc] initWithContentsOfURL:newURL];
        [self setImage:newImage];
    }

return self;
}

To make the view visible.

I then edited the nib file by adding a custom class to the window, and changing the class of the custom class to MyClass. It worked fine, so I dunno whats wrong.