import ohos.aafwk.ability.Ability;
import ohos.aafwk.content.Intent;
import ohos.agp.components.Component;
import ohos.agp.components.ComponentContainer;
import ohos.agp.components.DirectionalLayout;
import ohos.agp.utils.Point;
import ohos.agp.utils.Rect;
import ohos.agp.window.service.Display;
import ohos.agp.window.service.DisplayManager;
import ohos.event.handler.EventHandler;
import ohos.event.handler.EventRunner;
import ohos.eventhandler.TouchEventHandle;
import ohos.eventhandler.TouchEventHandleAdapter;
import ohos.eventhandler.TouchEventHandleContext;
import ohos.eventhandler.TouchEventHandleInfo;
import ohos.eventhandler.TouchEventHandlePhase;
import ohos.eventhandler.TouchEventHandleType;
import ohos.eventhandler.TouchEventHandleWindow;

public class MyAbility extends Ability {
    private static final int INVALID_POINTER_ID = -1;

    private static final int TOUCH_EVENT_TYPE = TouchEventHandleType.ALL;

    private DirectionalLayout directionalLayout;

    private VelocityDetector velocityDetector;

    private int activePointerId = INVALID_POINTER_ID;

    private Point startPoint = new Point();

    @Override
    public void onStart(Intent intent) {
        super.onStart(intent);
        super.setUIContent(ResourceTable.Layout_ability_main);

        directionalLayout = (DirectionalLayout) findComponentById(ResourceTable.Id_directionalLayout);

        // 获取屏幕的宽度和高度
        Display display = DisplayManager.getInstance().getDefaultDisplay(getContext());
        Rect displayRect = new Rect();
        display.getDisplayRect(displayRect);

        // 初始化VelocityDetector
        velocityDetector = new VelocityDetector(EventRunner.create(true));

        // 设置Touch事件监听器
        directionalLayout.setTouchEventHandle(
            new TouchEventHandle(TOUCH_EVENT_TYPE, new MyTouchEventHandle(), new EventHandler(EventRunner.create(true))));
    }

    private class MyTouchEventHandle extends TouchEventHandleAdapter {
        @Override
        public boolean onTouchEventHandle(TouchEventHandleInfo touchEventHandleInfo) {
            Point currentPoint = touchEventHandleInfo.getPoint();
            int action = touchEventHandleInfo.getAction();
            int index = touchEventHandleInfo.getIndex();

            switch (action) {
                case TouchEventHandlePhase.START:
                    // 记录起始点
                    activePointerId = index;
                    startPoint.set(currentPoint);
                    velocityDetector.clear();
                    velocityDetector.addMovement(touchEventHandleInfo.getEvent());
                    break;
                case TouchEventHandlePhase.MOVE:
                    if (index == activePointerId) {
                        // 计算手指移动的距离
                        float deltaX = currentPoint.x - startPoint.x;
                        float deltaY = currentPoint.y - startPoint.y;

                        // 更新起始点
                        startPoint.set(currentPoint);

                        // 计算手指移动的速度
                        velocityDetector.addMovement(touchEventHandleInfo.getEvent());
                        velocityDetector.computeCurrentVelocity(1000); // 单位是像素/秒

                        // 处理手指移动事件，例如更新界面位置
                        handleMoveEvent(deltaX, deltaY);
                    }
                    break;
                case TouchEventHandlePhase.END:
                case TouchEventHandlePhase.CANCEL:
                    if (index == activePointerId) {
                        // 手指离开屏幕，清除活动指针
                        activePointerId = INVALID_POINTER_ID;
                        velocityDetector.addMovement(touchEventHandleInfo.getEvent());
                        velocityDetector.computeCurrentVelocity(1000);

                        // 处理手指离开事件，例如根据速度进行操作
                        handleUpEvent();
                    }
                    break;
            }
            return true;
        }
    }

    private void handleMoveEvent(float deltaX, float deltaY) {
        // 在这里处理手指移动事件，例如更新界面位置
        // 可以使用deltaX、deltaY来计算移动的距离
    }

    private void handleUpEvent() {
        // 在这里处理手指离开事件，例如根据速度进行操作
        // 可以使用velocityDetector.getXVelocity()、velocityDetector.getYVelocity()获取速度
    }
}