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#include "animation.h"
#include <utility>
namespace cru::ui::animations
{
namespace details
{
class AnimationDelegateImpl;
constexpr double frame_rate = 60;
constexpr AnimationTimeUnit frame_step_time = AnimationTimeUnit(1) / frame_rate;
class AnimationDelegateImpl : public virtual IAnimationDelegate
{
public:
explicit AnimationDelegateImpl(String tag)
: tag_(std::move(tag))
{
}
AnimationDelegateImpl(const AnimationDelegateImpl& other) = delete;
AnimationDelegateImpl(AnimationDelegateImpl&& other) = delete;
AnimationDelegateImpl& operator=(const AnimationDelegateImpl& other) = delete;
AnimationDelegateImpl& operator=(AnimationDelegateImpl&& other) = delete;
~AnimationDelegateImpl() override = default;
void Cancel() override
{
AnimationManager::GetInstance()->RemoveAnimation(tag_);
}
private:
String tag_;
};
class Animation : public Object
{
public:
Animation(AnimationInfo info, AnimationDelegatePtr delegate)
: info_(std::move(info)), delegate_(std::move(delegate))
{
}
Animation(const Animation& other) = delete;
Animation(Animation&& other) = delete;
Animation& operator=(const Animation& other) = delete;
Animation& operator=(Animation&& other) = delete;
~Animation() override;
// If finish or invalid, return false.
bool Step(AnimationTimeUnit time);
String GetTag() const
{
return info_.tag;
}
private:
const AnimationInfo info_;
const AnimationDelegatePtr delegate_;
AnimationTimeUnit current_time_ = AnimationTimeUnit::zero();
};
AnimationManager::AnimationManager()
{
}
AnimationManager::~AnimationManager()
{
KillTimer();
}
AnimationDelegatePtr AnimationManager::CreateAnimation(AnimationInfo info)
{
if (animations_.empty())
SetTimer();
const auto tag = info.tag;
auto delegate = std::make_shared<AnimationDelegateImpl>(tag);
animations_[tag] = std::make_unique<Animation>(std::move(info), delegate);
return delegate;
}
void AnimationManager::RemoveAnimation(const String& tag)
{
const auto find_result = animations_.find(tag);
if (find_result != animations_.cend())
animations_.erase(find_result);
if (animations_.empty())
KillTimer();
}
void AnimationManager::SetTimer()
{
if (!timer_.has_value())
timer_ = SetInterval(std::chrono::duration_cast<std::chrono::milliseconds>(frame_step_time), [this]()
{
auto i = animations_.cbegin();
while (i != animations_.cend())
{
auto current_i = i++;
if (current_i->second->Step(frame_step_time))
animations_.erase(current_i);
}
if (animations_.empty())
KillTimer();
});
}
void AnimationManager::KillTimer()
{
if (timer_.has_value())
{
timer_.value().Cancel();
timer_ = std::nullopt;
}
}
Animation::~Animation()
{
if (current_time_ < info_.duration)
for (const auto& handler : info_.cancel_handlers)
handler();
}
bool Animation::Step(const AnimationTimeUnit time)
{
current_time_ += time;
if (current_time_ > info_.duration)
{
for (const auto& handler : info_.step_handlers)
handler(delegate_, 1);
for (const auto& handler : info_.finish_handlers)
handler();
return true;
}
else
{
for (const auto& handler : info_.step_handlers)
handler(delegate_, current_time_ / info_.duration);
return false;
}
}
}
AnimationDelegatePtr AnimationBuilder::Start()
{
CheckValid();
valid_ = false;
return details::AnimationManager::GetInstance()->CreateAnimation(std::move(info_));
}
}
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