Re: Core Animation and NSImageView

FROM : Bill Dudney
DATE : Thu Jan 24 15:47:08 2008

Hi Mário,

I'm not sure I understand your question. Let me try to rephrase as I 
understand it and answer what I think you are asking, if I'm way off 
base ping back.

You have an image view that you are trying to animate growing and 
shrinking as well as switching the image?

Animating the resize is a snap;

[[myimageview animator] setFrame:newFrame];

Animating the image change however is not so straight forward with 
NSImageView.

If you wanted to move to a layer hosting view (as opposed to a layer 
backed view) you would get animation (default fade transition) from 
calling myLayer.contents = newImage but that requires a bunch of other 
stuff (CGImageRef instead of NSIMage etc).

I think an easier solution would be to have 2 image views one small 
with the small image, one large with the large image.

When the button is clicked replace one image view with the other;

[[myContainerView animator] replaceSubview:view1 with:view2];

as long as myContainerView is layer backed (the check box in IB) this 
will perform the default fade transition animation.

This will not animate the size transition though. I think to get both 
you are going to have to go to layer hosting views and create some 
layers of your own.

HTH,

-bd-
http://bill.dudney.net/roller/objc

On Jan 23, 2008, at 7:29 PM, Mário Freitas wrote:

> Hi there,I have a problem with an application when I enable Core 
> Animation.
> Basically, I have a HUD window, a tab view, a button and a 
> NSImageView. When
> I click the button, I raise an action on the application controller 
> which
> basically does the following:
>
> [imageview setImage:toggle_image];
>
> [imageview setFrame:toggle_rect];
>
> [imageview setToolTip:toggle_tooltip];
>
>
> When I click the button I want to toggle the
> frame, image, and tooltip depending on 2 states. In the 1st state
> (initial) the image is smaller and in the 2nd state it's bigger. The
> origin of the image view is also repositioned.
>
> An illustration of the 2 frame configurations would be:
>
>    |x| (width = 10, height = 10, x origin = 30, y origin = 0) 1st 
> state
> |xxxx| (width = 40, height = 10, x origin = 0, y origin = 0) 2nd state
>
> Actually, this works great when core animation is disabled. However,
> When I'm using core animation on a tab view which embeds the picture,
> this doesn't work as expected: the first transition (1->2) works
> nicely, but not the next (2->1). If I reverse the order, the first
> transition (2->1) doesn't work. By "doesn't work as expected" I mean
> the image and tooltips are correctly toggled but not the image frame.
> When the frame becomes bigger (2->1), the frame
> is
> constantly kept _visually_ at this size in the following clicks and
> never reduces
> to the small size. One "interesting" thing
> I've noticed is that, although the image is kept constant (in big
> size), the tool tip only appears If I position the cursor in the area
> where it would be considered correct (
> e.g., after a 2->1 transition, the image frame is incorrectly kept big
> but the the tooltip
> only appears as if the frame would be correctly changed to small). 
> At first
> I thought this would be related to "dirty" screen buffers but that 
> wouldn't
> be possible since the image is updated all over the (incorrect) 
> frame size.
> Even so, I tried forcing the drawing on the NSImageView and tab view 
> but
> didn't produce any effect.
>
> Although I haven't tried,
> I believe that instead of using the same NSImageView I could use 2 for
> the 2 different states, but still it doesn't make sense for me why
> this isn't working.
> Any hints?
>
> Thanks in advance,
>
> Mário Freitas
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