1 /*
2  * Copyright (c) 2021 Huawei Device Co., Ltd.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at
6  *
7  *     http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 
16 #ifndef FOUNDATION_ACE_FRAMEWORKS_CORE_ANIMATION_ANIMATION_H
17 #define FOUNDATION_ACE_FRAMEWORKS_CORE_ANIMATION_ANIMATION_H
18 
19 #include "base/utils/listener.h"
20 #include "core/animation/curve.h"
21 #include "core/animation/interpolator.h"
22 
23 namespace OHOS::Ace {
24 
25 template<typename T>
26 class ACE_FORCE_EXPORT Animation : public Interpolator, public ValueListenable<T> {
27     DECLARE_ACE_TYPE(Animation, Interpolator);
28 
29 public:
30     virtual const T& GetValue() const = 0;
31 
OnInitNotify(float normalizedTime,bool reverse)32     void OnInitNotify(float normalizedTime, bool reverse) override
33     {
34         // If the user sets the initial value, the animation stay at the initial value.
35         if (inited_) {
36             ValueListenable<T>::NotifyListener(initValue_);
37         } else {
38             OnNormalizedTimestampChanged(normalizedTime, reverse);
39         }
40     }
41 
SetInitValue(const T & initValue)42     void SetInitValue(const T& initValue)
43     {
44         initValue_ = initValue;
45         inited_ = true;
46     }
47 
HasInitValue()48     bool HasInitValue() const
49     {
50         return inited_;
51     }
52 
SetCurve(const RefPtr<Curve> & curve)53     virtual void SetCurve(const RefPtr<Curve>& curve) {}
54 
55 private:
56     T initValue_ {};
57     bool inited_ = false;
58 };
59 
60 } // namespace OHOS::Ace
61 
62 #endif // FOUNDATION_ACE_FRAMEWORKS_CORE_ANIMATION_ANIMATION_H
63