Re: Generating Scrolling Text
Re: Generating Scrolling Text
- Subject: Re: Generating Scrolling Text
- From: Gideon King <email@hidden>
- Date: Mon, 26 Dec 2005 01:02:53 +1000
This may be a bit of a low tech way of doing this, but what I did was
make a 1 pixel wide and appropriate height image that goes from
opaque (in my case white) to transparent, and stretched it across the
width of the bottom of the scrolling area and ditto in reverse at the
top, and voila it shades in and out. You can see this in operation in
the NovaMind about panel www.nova-mind.com
Gideon King
email@hidden
On 21/12/2005, at 8:04 AM, Philip Dow wrote:
I was aware of the cocoa dev article, but as far as I understand
it, when the text scrolling restarts, the entire scroll area of
text would reappear and continue scrolling, whereas with the iTunes
about box, only one line appears at the bottom at restart. I
suppose you could get around this by padding the text with newlines
at the beginning. I had been planning to pad my offscreen image
with whitespace at the top and bottom so I wouldn't need to worry
about resizing the source rect, only moving it. But then, with the
text view, I would not be able to gently fade the attributed string
in and out if I were to implement something like that in the future.
-Phil
On Dec 20, 2005, at 10:57 PM, Eamon Ford wrote:
http://cocoadevcentral.com/articles/000044.php
Does that help at all?
On Dec 20, 2005, at 1:52 PM, Philip Dow wrote:
I'm looking to generate some scrolling text in a view. No scroll
bars are involved. Rather, I'd like to begin the text at the
bottom of the view and scroll it upwards, eventually fading it
out at the top and restarting when finished. Basically what you
see in the iTunes about box.
What's the best way to do this? I'm thinking of using a custom
nsview. I would render my attributed string into an instance
variable nsimage either at init or some other point prior to
drawing. A timer would fire calling a method to change the
dimensions of a rect which I would then use as the source rect
for compositing the image in the view's drawInRect method. The
sounds pretty good to me, but I don't know if it's the best or
most efficient way. Is there a better?
Plus, just to be sure, I should be able to draw my attributed
string into the image as long as I lock focus on it, right?
-Phil
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