On Aug 20, 2010, at 12:13, Brian Postow wrote:
> So, just to clarify, the whole hierarchy is Window> ContentView > ScrollView
> > ClipView > ImageView > Image? I take the "ContentView" to mean the content
> view of the window, or is there some other view between the scrollview and
> the clipview?
I had to laugh when I read this -- you found yet another meaning of "content"
for the discussion, so now we have 3. Here's the hierarchy, disambiguated:
window (NSWindow) > window content view (NSView) > scroll view
(NSScrollView) > scroll content view (NSClipView) > document view (whatever
view sub-hierarchy you want, but a solitary NSImageView in this case) >
document view contents (whatever you want, but NSImage in this case, not a
view, just graphical stuff)
The terminology actually makes sense -- the window consists of a content view,
surrounded by window frame widgetry; the scroll view consists of a content
view, surrounded by scroll widgetry -- but it would be less confusion-prone if
the scroll content view was just called the clip view instead.
> If I don't make the imageview smaller than the others (which are (almost) all
> the same size), then how do I make the image smaller than the content view?
[NSImage drawInRect...] with a suitably sized destination rect -- see below. As
I said before, you can't do this with a standard NSImageView -- you do it
within 'drawRect:' of a custom NSView.
> But then I have to manually draw my image into the view and keep track of
> that myself.... I *DO* have an image (NSImage, CGImageRef, bitmap, SOMETHING)
It's as simple as:
[myImage drawInRect: dstRect fromRect: NSZeroRect operation:
NSCompositeSourceOver fraction: 1.0];
You do have to calculate dstRect first. Its size comes from [myImage size]
combined with the current display scale factor. Its origin should be chosen to
position the image so as to occupy the entire view, OR as desired within the
view *when it's smaller than the view*. Note that the image is never larger
than the view -- you always size the view to be at least as large as the image,
so that the scroll bars, in traversing the entire view, also traverse the
entire image.
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