[Qt-qml] Simple and reversible ?

[Jason H]

The problem is if you do it in one animation, the from and two are the same so 
the middle of your 2000ms (total) animation would not be recognized.

I would probably look into making a C++ class which would accept your reverse 
property, and have it achieve 'to' in 1/2 the duration. You might be able to do 
that in JS as well too, but it won't kill performance, since you're just 
doctoring the values. 







________________________________
From: Attila Csipa <qt at csipa.in.rs>
To: qt-qml at qt.nokia.com
Sent: Sun, February 6, 2011 9:23:22 AM
Subject: [Qt-qml] Simple and reversible ?

 
Just to hear a few thoughts (in addition to the irc ones)... What's the simple 
way of doing back-and-forth animations *without* including additional states, 
grouping them in sequences or killing performance by doing it in JS ? Example:
Image{
id:glow
source:"glow.png"
SequentialAnimation{
running:true
loops:Animation.Infinite
PropertyAnimation{target:glow;property:"opacity";from:0.0;to:1.0;duration:1000;}
PropertyAnimation{target:glow;property:"opacity";from:1.0;to:0.0;duration:1000;}
}
}
Ideally, I would expect to see a single statement for this kind of things, i.e.
Image{
id:glow
source:"glow.png"
PropertyAnimation{property:"opacity";from:0.0;to:1.0;duration:1000; reversing: 
true}
}
Of course, I'm not emotionally attached to a particular syntax (loops: 
Animation.InfiniteReversing ? Some magical easing.type = Easing.Yoyo ?), but 
still, it would certainly cut down a lot of unnecessary syntax verbosity and we 
apparently already seem to have an unexposed direction attribute on the C++ 
side...
Attila


      
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