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// Copyright 2015 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef COBALT_CSSOM_ANIMATION_SET_H_
#define COBALT_CSSOM_ANIMATION_SET_H_
#include <map>
#include <string>
#include "cobalt/cssom/animation.h"
#include "cobalt/cssom/css_computed_style_data.h"
namespace cobalt {
namespace cssom {
// Manages a set of CSS Animation instantiations applied to a specific
// element (either an HTML Element or a Pseudo Element). The
// AnimationSet::Update() method should be called to update the AnimationSet's
// internal animations based on the new computed style. As AnimationSet
// internally creates and destroys a set of animations, it generates
// EventHandler::OnAnimationStarted() and EventHandler::OnAnimationRemoved()
// events.
class AnimationSet {
public:
class EventHandler {
public:
virtual void OnAnimationStarted(const Animation& animation) = 0;
virtual void OnAnimationRemoved(const Animation& animation) = 0;
};
// Create an Animation with the specified EventHandler, whose methods will
// be called when Animation::Update() is called.
explicit AnimationSet(EventHandler* event_handler);
// Update the internal state of animations based on our previous state and the
// passed in computed style. Animations may be started or ended when this
// method is called.
// Returns whether or not the update modified the animations.
bool Update(const base::TimeDelta& current_time,
const CSSComputedStyleData& style,
const CSSKeyframesRule::NameMap& keyframes_map);
// Returns true if there are no animations in this set.
bool empty() const { return animations_.empty(); }
// Clears all animations out of this animation set.
void Clear();
private:
// Our internal collection of animations, mapping 'animation-name' to
// a Animation object.
typedef std::map<std::string, Animation> InternalAnimationMap;
EventHandler* event_handler_;
InternalAnimationMap animations_;
DISALLOW_COPY_AND_ASSIGN(AnimationSet);
};
} // namespace cssom
} // namespace cobalt
#endif // COBALT_CSSOM_ANIMATION_SET_H_