1 /* 2 * Copyright (c) 2025 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 #ifndef FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_NG_PATTERNS_SCROLL_ZOOM_CONTROLLER_H 16 #define FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_NG_PATTERNS_SCROLL_ZOOM_CONTROLLER_H 17 18 #include "core/components_ng/base/modifier.h" 19 #include "core/components_ng/gestures/recognizers/pinch_recognizer.h" 20 21 namespace OHOS::Ace::NG { 22 class ScrollPattern; 23 24 /** 25 * @brief Controller for free scrolling behavior. It manages related gestures and animations. 26 * 27 */ 28 class ZoomController final : public AceType { 29 DECLARE_ACE_TYPE(ZoomController, AceType); 30 ACE_DISALLOW_COPY_AND_MOVE(ZoomController); 31 32 public: 33 explicit ZoomController(ScrollPattern& pattern); 34 ~ZoomController() final; 35 GetPinchGesture()36 RefPtr<PinchRecognizer> GetPinchGesture() const 37 { 38 return pinchGesture_; 39 } 40 41 private: 42 void InitializePinchGesture(); 43 void DeinitializePinchGesture(); 44 void HandleZoomStart(GestureEvent& info); 45 void HandleZoomUpdate(GestureEvent& info); 46 void HandleZoomEnd(GestureEvent& info); 47 OffsetF GetCenterPoint(GestureEvent& info); 48 void UpdateOffset(float scale, float prevScale, OffsetF centerOffset); 49 50 ScrollPattern& pattern_; 51 RefPtr<PinchRecognizer> pinchGesture_; 52 float zoomScaleStart_ = 1.0f; 53 }; 54 55 } // namespace OHOS::Ace::NG 56 #endif // FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_NG_PATTERNS_SCROLL_ZOOM_CONTROLLER_H 57