Friends
I'm writing to ask for ideas concerning the new plasma::Animator based on Qt
4.6 animation api.
The current design works like this:
- create the animation object
- set the animated widget
- add the animation to an animation group (multiple animation objects are
allowed as also the group can be linear or parallel)
- connect a signal to its start slot
The only problem is that internally it will create all the animation objects
and later destroy them *every* single time that the animation runs. This design
saves memory (or not, read more about it below) but probably is expensive in
processing time.
Another issue is that once the animation is destroyed, the previous state of
the animated object is lost. To give one example:
- Say that in plasma-netbook we want to have a grow/shrink animation of
selected icons. The current design requires to create 2 animations (grow,
shrink) and create/destroy it every time that the mouse hover happens. It also
requires to know what was the size factor used in the first animation (or the
shrink animation will not return the animated object to its initial state).
If we were able to maintain the animation object 'alive', it could be done
using only 1 animation object (i.e. grow) and rewinding the animation back when
the mouse is moved out of the selected icon.
I think that there are 2 issues to address in the design:
- make possible to reuse the animation objects
- make possible to store/restore the animated object states
I'm planning to work on it this week but I would appreciate comments, ideas and
user cases about it before writing the code.
Best regards
Adenilson Cavalcanti
a.k.a. Savago
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