On Jun 23, 2010, at 1:28 PM, Kyle Sluder wrote: > On Wed, Jun 23, 2010 at 10:33 AM, Alexander Cohen <[email protected]> > wrote: >> I have a view in an NSScrollView's document view that has a small child >> window attached to it, meaning the window follows that view wherever it >> goes. But when i scroll the scrollview, not much changes for that view. So >> i'm wondering if there is anyway to get changes to a views "global" frame. >> If i'm missing something obvious, please do tell. > > Scroll views (actually, clip views) work by moving their bounds > coordinate system. When AppKit draws the view hierarchy, it applies a > transform to the current graphics context that is based on the bounds > coordinate system of the view being drawn; this is how you can draw at > (0,0) in your -drawRect: and have it appear at the right point in the > superview. Likewise, as AppKit finishes drawing a view, it pops these > transforms off the stack. > > By the time your overlay window draws, it's in another window > entirely, so it has an entirely different transform stack—notably one > lacking the transform the clip view has applied prior to your document > view being drawn. > > Your child window or the content view thereof is going to need to > listen for bounds-change notifications from the clip view and set its > own bounds coordinate system to match. > _______________________________________________
Depending on your needs, you may also want to consider subclassing NSViewController or NSWindowController to handle things. _______________________________________________ Cocoa-dev mailing list ([email protected]) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [email protected]
