Package icyllis.modernui.transition

# Interface Transition.EpicenterCallback

Enclosing class:
  `Transition`

Functional Interface:
  This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface public static interface Transition.EpicenterCallback
Interface to get the epicenter of Transition. Use `Transition.setEpicenterCallback(EpicenterCallback)` to set the callback used to calculate the epicenter of the Transition. Override `Transition.getEpicenter()` to return the rectangular region in screen coordinates of the epicenter of the transition.

See Also:
  - `Transition.setEpicenterCallback(EpicenterCallback)`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `Rect`
  `onGetEpicenter(Transition transition)`
  Implementers must override to return the epicenter of the Transition in screen coordinates.

- ## Method Details

  - ### onGetEpicenter

    @Nullable Rect onGetEpicenter(@Nonnull Transition transition)
    Implementers must override to return the epicenter of the Transition in screen coordinates. Transitions like `Explode` depend upon an epicenter for the Transition. In Explode, Views move toward or away from the center of the epicenter Rect along the vector between the epicenter and the center of the View appearing and disappearing. Some Transitions, such as `Fade` pay no attention to the epicenter.
    Parameters:
      `transition` - The transition for which the epicenter applies.
    Returns:
      The Rect region of the epicenter of `transition` or null if there is no epicenter.