What Sherm suggests is exactly what I described as my solution,
and it does work, with one serious problem: Capturing the image
that gets drawn in the manner described *also* captures whatever
background lies beyond the transparent portions of the image, and
that is not what I want. That is why I have to hack the bitmap
after capturing it.
If I set a particular background color for the view where I am drawing
the image, then the newly-captured image shows that color where the
original image was transparent. If I tell that view not to draw its
background, or set its background color to transparent, then I get the
background color of the window at the base of the view hierarchy.
And if tell that window not to draw its background, or to use a
transparent background color, then the transparent portions of
the original image come out dead black in the copy. (I suspect that
dead black is the "color" of off-screen portions of the Mac console.)
-- Jay Reynolds Freeman
---------------------
jay_reynolds_free...@mac.com
http://web.mac.com/jay_reynolds_freeman (personal web site)
On Jul 25, 2009, at 11:25 AM, Sherm Pendley wrote:
On Sat, Jul 25, 2009 at 1:54 PM, Jay Reynolds
Freeman<jay_reynolds_free...@mac.com> wrote:
What I want to do is modify the dock icon while the application
running.
The only interface I can find to do this is
NSApp.setApplicationIconImage: , which requires an NSImage. I have
no way
to get at the actual view being used to draw the dock icon, in order
to
subclass it; I have to create a new NSImage somehow, and pass that to
setApplicationIconImage.
You don't need to subclass anything just to draw into an NSImage. You
can call an NSImage's -lockFocus method to direct all the usual
drawing functions and methods to draw into that image, instead of into
an onscreen view. Don't forget to call -unlockFocus when you're done!
So, what you want to do is, get the default image, -copy it and
-autorelease the copy, send the copy a -lockFocus, draw whatever
content you want to add to the icon, using all the usual functions &
methods you'd have used in a subclass' -drawRect: method, send the
copy a -unlockFocus, send the copy to -setApplicationIconImage:.
sherm--
--
Cocoa programming in Perl: http://camelbones.sourceforge.net
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