mojo/services/view_manager/public/interfaces/animations.mojom

// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

module mojo;

import "mojo/services/geometry/public/interfaces/geometry.mojom";

enum AnimationTweenType {
  LINEAR,
  EASE_IN,
  EASE_OUT,
  EASE_IN_OUT,
};

enum AnimationProperty {
  // Used for pausing.
  NONE,
  OPACITY,
  TRANSFORM,
};

struct AnimationValue {
  float float_value;
  Transform transform;
};

// Identifies how a particular property should be animated between a start and
// target value.
struct AnimationElement {
  AnimationProperty property;

  // Duration is in microseconds.
  int64 duration;

  AnimationTweenType tween_type;

  // If not specified the start value is taken from either the current value
  // (for the first element) or the target_value of the previous element.
  AnimationValue? start_value;

  // target_value may be null when property is NONE.
  AnimationValue? target_value;
};

// An AnimationSequence consists of a number of AnimationElements to animate.
// Each element is animated serially.
struct AnimationSequence {
  // Number of times to run the sequence. Value of 0 means run until
  // explicitly stopped.
  uint32 cycle_count;

  array<AnimationElement> elements;
};

// AnimationGroup identifies a view and a set of AnimationSequences to apply
// to the view. Each sequence is run in parallel.
struct AnimationGroup {
  uint32 view_id;
  array<AnimationSequence> sequences;
};