AnimationSchedulerImpl abstract class / dart_web_toolkit_animation Library / API Reference / Dart Web Toolkit

AnimationSchedulerImpl abstract class

Base class for animation implementations.

abstract class AnimationSchedulerImpl extends AnimationScheduler {

 static AnimationSchedulerImpl impl;

 factory AnimationSchedulerImpl.Instance() {

   impl = new AnimationSchedulerImpl.browserDependent();

   /*
    * If the implementation isn't natively supported, revert back to the timer
    * based implementation.
    *
    * If impl==null (such as with GWTMockUitlities.disarm()), use null. We
    * don't want to create a new AnimationSchedulerImplTimer in this case.
    */
   if (impl is AnimationSchedulerImpl) {
     if (!impl.isNativelySupported()) {
       impl = new AnimationSchedulerImplTimer();
     }
   }

   return impl;
 }

 AnimationSchedulerImpl();

 factory AnimationSchedulerImpl.browserDependent() {
   return new AnimationSchedulerImplWebkit();
 }

 /**
  * Check if the implementation is natively supported.
  *
  * @return true if natively supported, false if not
  */
 bool isNativelySupported();
}

Extends

AnimationScheduler > AnimationSchedulerImpl

Subclasses

AnimationSchedulerImplTimer, AnimationSchedulerImplWebkit

Static Properties

AnimationSchedulerImpl impl #

static AnimationSchedulerImpl impl

Constructors

new AnimationSchedulerImpl() #

Creates a new Object instance.

Object instances have no meaningful state, and are only useful through their identity. An Object instance is equal to itself only.

docs inherited from Object

AnimationSchedulerImpl();

factory AnimationSchedulerImpl.browserDependent() #

factory AnimationSchedulerImpl.browserDependent() {
 return new AnimationSchedulerImplWebkit();
}

factory AnimationSchedulerImpl.Instance() #

Returns the default implementation of the AnimationScheduler API.

docs inherited from AnimationScheduler

factory AnimationSchedulerImpl.Instance() {

 impl = new AnimationSchedulerImpl.browserDependent();

 /*
  * If the implementation isn't natively supported, revert back to the timer
  * based implementation.
  *
  * If impl==null (such as with GWTMockUitlities.disarm()), use null. We
  * don't want to create a new AnimationSchedulerImplTimer in this case.
  */
 if (impl is AnimationSchedulerImpl) {
   if (!impl.isNativelySupported()) {
     impl = new AnimationSchedulerImplTimer();
   }
 }

 return impl;
}

Methods

abstract bool isNativelySupported() #

Check if the implementation is natively supported.

@return true if natively supported, false if not

abstract AnimationHandle requestAnimationFrame(AnimationCallback callback, [Element element = null]) #

inherited from AnimationScheduler

Schedule an animation, letting the browser decide when to trigger the next step in the animation.

Using this method instead of a timeout is preferred because the browser is in the best position to decide how frequently to trigger the callback for an animation of the specified element. The browser can balance multiple animations and trigger callbacks at the optimal rate for smooth performance.

@param callback the callback to fire @return a handle to the requested animation frame @param element the element being animated