I want make an app to solve some physics problems. Then my app have a panel
wiht many things (ball, cannon, wall, ....) to represent the problem. When a
user do click in some of this things, a NSViewImage is add into the chalckbord
(a NSView's subclass). I want let the user to move these things to any position
(with a drag operation). But, when I do click in one of this things
(NSImageView), the NSView don't get the NSEvent, then I can't move the
NSImageView with mouseDragged: method (in the NSView). Even if I add the
NSImageView with addSubview: positioned: relativeTo: with the argument
NSWindowBelow. I don't know some method to delegate this event from NSImageView
to NSView. I tryed with Drag & Drop, but I only can move an image from one
NSImageView to another. Then I think in a subclass of NSImageView to write the
mouseDragged: method. I add this subclass in something like this
- (void) addObject: (id)sender
{
/* insert your code here */
NSImage *icono = [[NSImage alloc] initByReferencingFile: @"Resources/112.tif"] ;
NSImageView *nuevoIcono = [[MIImagen alloc] initWithFrame:
NSMakeRect(20,20,90,90)] ;
[nuevoIcono setImage: icono] ;
[nuevoIcono setEditable: NO] ;
[self addSubview: nuevoIcono positioned: NSWindowBelow relativeTo: self] ;
[self setNeedsDisplay: YES] ;
RELEASE(icono) ;
RELEASE(nuevoIcono) ;
}
MIImagen is my subclass of NSImageVIew. I add the MIImagen.h file in the header
of the chalckboar (NSView's subclass). If I write NSImageView instead MIImagen,
the image is added.
--- El jue 25-sep-08, Markus Hitter <[EMAIL PROTECTED]> escribió:
De: Markus Hitter <[EMAIL PROTECTED]>
Asunto: Re: One question about subclass
A: "Germán Arias" <[EMAIL PROTECTED]>
Cc: [email protected]
Fecha: jueves, 25 septiembre, 2008, 12:12 am
Am 25.09.2008 um 00:44 schrieb Germán Arias:
> For example, I create a subclass of NSImageView, I set its methods
> and all OK.
> But when my app is running and I alloc and init my subclass I don't
> see the
> object's instance. I don't get any error. Can somebody tell me
what
> is the
> problem?
As always, code snippets are great ...
Interesting would be, why you create a subclass. Subclassing is in
Obj-C a lot less in fashion (= rarely used) than in C++, as Obj-C has
categories (extensions to a class) and GNUstep/Cocoa makes a lot of
use of this capability.
Back to your question: Where would you expect to "see" something? If
you mean like appearing on the screen, then you have to connect this
view to a window somehow. Typically as a subview of the window's
contentView. Gorm would do this connection automatically when
dragging an NSImageView from the palette into a window.
MarKus
- - - - - - - - - - - - - - - - - - -
Dipl. Ing. Markus Hitter
http://www.jump-ing.de/
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