- make the ScrollBehavior instance long-lived, rather than recreating
it each time we update the list contents.
- have OverscrollBehavior track the total height of the contents and
the height of the scrollable region, so that it can determine when
to stop scrolling down.
- teach OverscrollBehavior about how to determine when to stop
scrolling down, and how to bounce when it's too far down.
- replace the 'energy' concept in Particles with a method that sets
the energy and direction at the same time, instead of assuming that
the direction is always positive when setting energy.
- make FixedHeightScrollable lists track the number of items in the
list and have them update their ScrollBehavior regarding this
information as it changes.
- track how many items are currently showing in the list stock list.
R=eseidel@chromium.org
Review URL: https://codereview.chromium.org/1097373002
Pipe the remaining time for an animation all the way out to the AnimatedValue.
Make splashes abortable, which causes them to continue to fade but no longer grow, by having them fade in 100ms or however long the animation was still going to go for, whichever is quickest.
Make Scrollables support objects registering with them to be told when scrolling happens.
Make UINode support subclasses being informed when _remove() was called.
Hook all that together to make splashes go away when scrolling by having them register with any ancestor Scrollables such that when those scroll, all the splashes get aborted. Unregister when removed.
R=eseidel@chromium.org
Review URL: https://codereview.chromium.org/1092423003
This patch adds a base AnimatedComponent from which most components that animated should derive. It takes care of listening & unlistening from the animations during did(Un)mount as well as binding the animated value to a private field and scheduling the component for build.
Note that this patch removes the did(Un)mount overridable methods from Component and replaces them with a callback mechanism which is less brittle.
BUG=
R=abarth@chromium.org
Review URL: https://codereview.chromium.org/1027633003
This patch removes the mutable API to event handling (Nodes no longer have a events object with which to add listeners).
Instead, a new (non-Render) Node is introduced: EventTarget. This node represents a location in the Effen tree which can handle events as they bubble.
Note that this also changes the implementation to use event delegation (one set of listeners at the sky.document level) rather than direct listeners on leaf nodes.
R=abarth@chromium.org
Review URL: https://codereview.chromium.org/1019633004
This CL cleans up the sky/framework/animation as follows:
1) I've moved code that's used only by the custom elements framework into
sky/framework/elements/animation. This code is based on AnimationDelegates
rather than Streams.
2) Rename ScrollCurve to ScrollBehavior because it encapsulates more behavior
than just a curve.
3) Make the Generator interface explicit and mark subclasses as actual
subclasses.
4) Move Simulation into generators.dart because it implements the Generator
interface.
5) Move Animation out of generators.dart because it does not implement the
Generator interface.
R=eseidel@chromium.org
Review URL: https://codereview.chromium.org/1001373002
This CL uses a simple physics simulation to drive overscroll animations.
We model settling the overscroll as a particle climbing a hill, which
gives us a pleasing parabolic trajectory.
This CL also includes machinery for spring-based simulations. We'll use
these to drive the drawer animation.
R=eseidel@chromium.org
Review URL: https://codereview.chromium.org/999423004
This CL teaches Scrollable how to settle back to a scroll offset of 0.0 after a
fling or a scroll. There's still some room for improvement:
1) Some of this logic should be factored out into the scroll curve object.
2) We don't produce the correct animation curves when we fling into the
overscroll region because we wait for the fling velocity to reach zero
before we start the settling animation.
R=ojan@chromium.org, eseidel@chromium.org
Review URL: https://codereview.chromium.org/1005753002
Intead of hard-coding the notion of bounded scrolling into Scrollable, this CL
factors out a ScrollCurve class that applies the bounds. In the future, we'll
refine this mechanism to implement overflow scrolling.
R=eseidel@chromium.org
Review URL: https://codereview.chromium.org/1005633002
