cc/animation/animation.h

   1 // Copyright 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CC_ANIMATION_ANIMATION_H_
   6 #define CC_ANIMATION_ANIMATION_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "base/time/time.h"
  11 #include "cc/base/cc_export.h"
  12
  13 namespace cc {
  14
  15 class AnimationCurve;
  16
  17 // An Animation contains all the state required to play an AnimationCurve.
  18 // Specifically, the affected property, the run state (paused, finished, etc.),
  19 // loop count, last pause time, and the total time spent paused.
  20 class CC_EXPORT Animation {
  21  public:
  22   // Animations begin in the 'WAITING_FOR_TARGET_AVAILABILITY' state. An
  23   // Animation waiting for target availibility will run as soon as its target
  24   // property is free (and all the animations animating with it are also able to
  25   // run). When this time arrives, the controller will move the animation into
  26   // the STARTING state, and then into the RUNNING state. RUNNING animations may
  27   // toggle between RUNNING and PAUSED, and may be stopped by moving into either
  28   // the ABORTED or FINISHED states. A FINISHED animation was allowed to run to
  29   // completion, but an ABORTED animation was not.
  30   enum RunState {
  31     WAITING_FOR_TARGET_AVAILABILITY = 0,
  32     WAITING_FOR_DELETION,
  33     STARTING,
  34     RUNNING,
  35     PAUSED,
  36     FINISHED,
  37     ABORTED,
  38     // This sentinel must be last.
  39     LAST_RUN_STATE = ABORTED
  40   };
  41
  42   enum TargetProperty {
  43     TRANSFORM = 0,
  44     OPACITY,
  45     FILTER,
  46     SCROLL_OFFSET,
  47     BACKGROUND_COLOR,
  48     // This sentinel must be last.
  49     LAST_TARGET_PROPERTY = BACKGROUND_COLOR
  50   };
  51
  52   enum Direction {
  53     DIRECTION_NORMAL,
  54     DIRECTION_REVERSE,
  55     DIRECTION_ALTERNATE,
  56     DIRECTION_ALTERNATE_REVERSE
  57   };
  58
  59   enum FillMode {
  60     FILL_MODE_NONE,
  61     FILL_MODE_FORWARDS,
  62     FILL_MODE_BACKWARDS,
  63     FILL_MODE_BOTH
  64   };
  65
  66   static scoped_ptr<Animation> Create(scoped_ptr<AnimationCurve> curve,
  67                                       int animation_id,
  68                                       int group_id,
  69                                       TargetProperty target_property);
  70
  71   virtual ~Animation();
  72
  73   int id() const { return id_; }
  74   int group() const { return group_; }
  75   TargetProperty target_property() const { return target_property_; }
  76
  77   RunState run_state() const { return run_state_; }
  78   void SetRunState(RunState run_state, base::TimeTicks monotonic_time);
  79
  80   // This is the number of times that the animation will play. If this
  81   // value is zero the animation will not play. If it is negative, then
  82   // the animation will loop indefinitely.
  83   double iterations() const { return iterations_; }
  84   void set_iterations(double n) { iterations_ = n; }
  85
  86   double iteration_start() const { return iteration_start_; }
  87   void set_iteration_start(double iteration_start) {
  88     iteration_start_ = iteration_start;
  89   }
  90
  91   base::TimeTicks start_time() const { return start_time_; }
  92
  93   void set_start_time(base::TimeTicks monotonic_time) {
  94     start_time_ = monotonic_time;
  95   }
  96   bool has_set_start_time() const { return !start_time_.is_null(); }
  97
  98   base::TimeDelta time_offset() const { return time_offset_; }
  99   void set_time_offset(base::TimeDelta monotonic_time) {
 100     time_offset_ = monotonic_time;
 101   }
 102
 103   void Suspend(base::TimeTicks monotonic_time);
 104   void Resume(base::TimeTicks monotonic_time);
 105
 106   Direction direction() { return direction_; }
 107   void set_direction(Direction direction) { direction_ = direction; }
 108
 109   FillMode fill_mode() { return fill_mode_; }
 110   void set_fill_mode(FillMode fill_mode) { fill_mode_ = fill_mode; }
 111
 112   double playback_rate() { return playback_rate_; }
 113   void set_playback_rate(double playback_rate) {
 114     playback_rate_ = playback_rate;
 115   }
 116
 117   bool IsFinishedAt(base::TimeTicks monotonic_time) const;
 118   bool is_finished() const {
 119     return run_state_ == FINISHED || run_state_ == ABORTED ||
 120            run_state_ == WAITING_FOR_DELETION;
 121   }
 122
 123   bool InEffect(base::TimeTicks monotonic_time) const;
 124
 125   AnimationCurve* curve() { return curve_.get(); }
 126   const AnimationCurve* curve() const { return curve_.get(); }
 127
 128   // If this is true, even if the animation is running, it will not be tickable
 129   // until it is given a start time. This is true for animations running on the
 130   // main thread.
 131   bool needs_synchronized_start_time() const {
 132     return needs_synchronized_start_time_;
 133   }
 134   void set_needs_synchronized_start_time(bool needs_synchronized_start_time) {
 135     needs_synchronized_start_time_ = needs_synchronized_start_time;
 136   }
 137
 138   // This is true for animations running on the main thread when the FINISHED
 139   // event sent by the corresponding impl animation has been received.
 140   bool received_finished_event() const {
 141     return received_finished_event_;
 142   }
 143   void set_received_finished_event(bool received_finished_event) {
 144     received_finished_event_ = received_finished_event;
 145   }
 146
 147   // Takes the given absolute time, and using the start time and the number
 148   // of iterations, returns the relative time in the current iteration.
 149   base::TimeDelta TrimTimeToCurrentIteration(
 150       base::TimeTicks monotonic_time) const;
 151
 152   scoped_ptr<Animation> CloneAndInitialize(RunState initial_run_state) const;
 153
 154   bool is_controlling_instance() const { return is_controlling_instance_; }
 155
 156   void PushPropertiesTo(Animation* other) const;
 157
 158   void set_is_impl_only(bool is_impl_only) { is_impl_only_ = is_impl_only; }
 159   bool is_impl_only() const { return is_impl_only_; }
 160
 161   void set_affects_active_observers(bool affects_active_observers) {
 162     affects_active_observers_ = affects_active_observers;
 163   }
 164   bool affects_active_observers() const { return affects_active_observers_; }
 165
 166   void set_affects_pending_observers(bool affects_pending_observers) {
 167     affects_pending_observers_ = affects_pending_observers;
 168   }
 169   bool affects_pending_observers() const { return affects_pending_observers_; }
 170
 171  private:
 172   Animation(scoped_ptr<AnimationCurve> curve,
 173             int animation_id,
 174             int group_id,
 175             TargetProperty target_property);
 176
 177   base::TimeDelta ConvertToActiveTime(base::TimeTicks monotonic_time) const;
 178
 179   scoped_ptr<AnimationCurve> curve_;
 180
 181   // IDs must be unique.
 182   int id_;
 183
 184   // Animations that must be run together are called 'grouped' and have the same
 185   // group id. Grouped animations are guaranteed to start at the same time and
 186   // no other animations may animate any of the group's target properties until
 187   // all animations in the group have finished animating.
 188   int group_;
 189
 190   TargetProperty target_property_;
 191   RunState run_state_;
 192   double iterations_;
 193   double iteration_start_;
 194   base::TimeTicks start_time_;
 195   Direction direction_;
 196   double playback_rate_;
 197   FillMode fill_mode_;
 198
 199   // The time offset effectively pushes the start of the animation back in time.
 200   // This is used for resuming paused animations -- an animation is added with a
 201   // non-zero time offset, causing the animation to skip ahead to the desired
 202   // point in time.
 203   base::TimeDelta time_offset_;
 204
 205   bool needs_synchronized_start_time_;
 206   bool received_finished_event_;
 207
 208   // When an animation is suspended, it behaves as if it is paused and it also
 209   // ignores all run state changes until it is resumed. This is used for testing
 210   // purposes.
 211   bool suspended_;
 212
 213   // These are used in TrimTimeToCurrentIteration to account for time
 214   // spent while paused. This is not included in AnimationState since it
 215   // there is absolutely no need for clients of this controller to know
 216   // about these values.
 217   base::TimeTicks pause_time_;
 218   base::TimeDelta total_paused_time_;
 219
 220   // Animations lead dual lives. An active animation will be conceptually owned
 221   // by two controllers, one on the impl thread and one on the main. In reality,
 222   // there will be two separate Animation instances for the same animation. They
 223   // will have the same group id and the same target property (these two values
 224   // uniquely identify an animation). The instance on the impl thread is the
 225   // instance that ultimately controls the values of the animating layer and so
 226   // we will refer to it as the 'controlling instance'.
 227   bool is_controlling_instance_;
 228
 229   bool is_impl_only_;
 230
 231   // When pushed from a main-thread controller to a compositor-thread
 232   // controller, an animation will initially only affect pending observers
 233   // (corresponding to layers in the pending tree). Animations that only
 234   // affect pending observers are able to reach the STARTING state and tick
 235   // pending observers, but cannot proceed any further and do not tick active
 236   // observers. After activation, such animations affect both kinds of observers
 237   // and are able to proceed past the STARTING state. When the removal of
 238   // an animation is pushed from a main-thread controller to a
 239   // compositor-thread controller, this initially only makes the animation
 240   // stop affecting pending observers. After activation, such animations no
 241   // longer affect any observers, and are deleted.
 242   bool affects_active_observers_;
 243   bool affects_pending_observers_;
 244
 245   DISALLOW_COPY_AND_ASSIGN(Animation);
 246 };
 247
 248 }  // namespace cc
 249
 250 #endif  // CC_ANIMATION_ANIMATION_H_