Get list element bounds or frame on scrolling

this question is related to Get scroll bar position of an NSScroller on the fly

开发者_如何学JAVA

But now i would like to know how to get current position of list element (green rect) on scrolling.

[self bounds] or [self frame] or [[self enclosingScrollView] ...] won't work for this kind of thing or i'm using it in wrong way.

EDIT

Inside frame of [[NSScrollView enclosingScrollView] contentView]] we see list of NSBox's. When i click on triangle of NSBox which is list element, instance of that NSBox is stored in -activeTicketRow, i've thought that i can then get NSBox coordinates inside NSScrollView frame when [[NSScrollView enclosingScrollView] contentView]] bounds changes, but after reading "View Programming Guide" i guess not.

I've added observer in NSScrollView

[[NSNotificationCenter defaultCenter] 
    addObserver:self
    selector:@selector(updateConvMenu:)
    name:NSViewBoundsDidChangeNotification
    object:[[self enclosingScrollView] contentView]
];

​

and in -updateConvMenu i get coordinates of [[self enclosingScrollView] contentView], so that's good.

QUESTION

No i would like to store NSBox (which triangle was clicked) from [[self enclosingScrollView] contentView] inside -activeTicketRow so i can then get it's frame coordinates in -updateConvMenu when [[self enclosingScrollView] contentView] bounds changes.

I think now this question is more readable.

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Views are in a hierarchy. Ask yourself "position relative to what view/window/screen?" Then use NSView's various -convertRect:... or NSWindow's -convert... methods.

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You can get the position of the content view by observing the NSClipViews (the scroll view's contentView) bounds by setting - (void)setPostsBoundsChangedNotifications:YES. Then just translate the coordinates to the view you want, when the notification occurs.

For the translation have a look at the docs Josh did already post View Programming Guide

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When scrolling through the list, i'm calculating whether the horizontal center of the selected item in the list does not go after a specific bounds, which overlaps on [NSScrollView frame].