control player object with mouse scroll wheel

[Martin Koob]

I was wondering if there was a way to make a player object receive the scroll messages from a mouse with a scroll wheel or from a two finger scroll gesture on a Mac Book Pro track pad.

The Quicktime Player application and a quicktime player in a web page does receive these so you can scrub back and forth in the video with the scroll button or on the track pad. I have tried this with a player in revolution and it does not work.

Martin

[BvG]

the scrollweel emits rawkeydown messages, so you can catch that, and do anything you want, like increasing or decreasing playloudness, the currentime, or the playrate.

[Martin Koob]

Thanks for the tip.

I managed to trap the rawkeydown messages and have them change the player's current time by putting the handlers I have listed below in the player's script, but, now when I scroll the mouse wheel up and down the slider in the movie controller moves accordingly but the movie does not redraw. If I click on a step button or push play then the movie will refresh and show the next frame. Is there another command that I need to make it redraw?

I don't have this problem in other situations where I set the currenttime of the player. It jumps to a new location and the movie display is updated. Is it because it is such a small increment?



on rawKeyDown theKeyNumber
if theKeyNumber is 65308 then stepforward -- mouse wheel down
else if theKeyNumber is 65309 then stepbackward -- mouse wheel up
else pass rawKeyDown
end rawKeyDown


on stepforward
set the currenttime of me to (the currenttime of me) + ((the timescale of me / 4))
end stepforward

on stepbackward
set the currenttime of me to (the currenttime of me) - ((the timescale of me / 4))
end stepbackward

Martin Koob

[trevordevore]

Hi Martin,

Try changing your code to this:

Code: Select all

on stepforward
    lock screen
    set the currenttime of me to (the currenttime of me) + round(the timescale of me / 4) 
    unlock screen
end stepforward 

on stepbackward
    lock screen
    set the currenttime of me to (the currenttime of me) - round(the timescale of me / 4) 
    unlock screen
end stepbackward 

locking/unlocking the screen worked on my end. Also adding round() to the calculation is necessary for movies that don't have a timescale of 600 (mp4 and mpg for example).