基于Kotlin的框架-协程 扩展 AndroidX Api29.zip

package com.guadou.kt_demo.demo.demo8_recyclerview.scroll10; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Canvas; import android.os.Build; import android.util.AttributeSet; import android.view.MotionEvent; import android.view.VelocityTracker; import android.view.View; import android.view.ViewConfiguration; import android.view.ViewGroup; import android.view.animation.Interpolator; import android.widget.AbsListView; import android.widget.EdgeEffect; import android.widget.OverScroller; import androidx.annotation.NonNull; import androidx.annotation.Nullable; import androidx.core.view.NestedScrollingChild2; import androidx.core.view.NestedScrollingChildHelper; import androidx.core.view.NestedScrollingParent2; import androidx.core.view.NestedScrollingParentHelper; import androidx.core.view.ScrollingView; import androidx.core.view.ViewCompat; import androidx.core.widget.EdgeEffectCompat; import androidx.recyclerview.widget.RecyclerView; import com.guadou.kt_demo.R; import java.util.ArrayList; import java.util.HashMap; import java.util.List; public class ConsecutiveScrollerLayout extends ViewGroup implements ScrollingView, NestedScrollingParent2, NestedScrollingChild2 { /** * 记录布局垂直的偏移量，它是包括了自己的偏移量(mScrollY)和所有子View的偏移量的总和， * 这个值不是真实的布局滑动偏移量，只是用于在滑动是记录和计算每次的滑动距离。 */ private int mSecondScrollY; /** * 联动容器可滚动的范围 */ int mScrollRange; /** * 联动容器滚动定位子view */ private OverScroller mScroller; /** * VelocityTracker */ private VelocityTracker mVelocityTracker; private VelocityTracker mAdjustVelocityTracker; private int mAdjustYVelocity; /** * MaximumVelocity */ private int mMaximumVelocity; /** * MinimumVelocity */ private int mMinimumVelocity; private int mTouchSlop; /** * 手指触摸屏幕时的触摸点 */ private int mTouchY; private int mEventX; private int mEventY; private HashMap<Integer, Float> mFixedYMap = new HashMap<>(); /** * 记录手指按下时的位置 */ private final int[] mDownLocation = new int[2]; /** * 是否处于状态 */ private boolean mTouching = false; private static final int SCROLL_NONE = 0; private static final int SCROLL_VERTICAL = 1; private static final int SCROLL_HORIZONTAL = 2; private int SCROLL_ORIENTATION = SCROLL_NONE; /** * 滑动监听 */ protected OnScrollChangeListener mOnScrollChangeListener; private int mActivePointerId = -1; private NestedScrollingParentHelper mParentHelper; private NestedScrollingChildHelper mChildHelper; private final int[] mScrollOffset = new int[2]; private final int[] mScrollConsumed = new int[2]; private View mScrollToTopView; private int mAdjust; /** * 滑动到指定view，目标view的index */ private int mScrollToIndex = -1; /** * 滑动到指定view，平滑滑动时，每次滑动的距离 */ private int mSmoothScrollOffset = 0; private int mScrollToIndexWithOffset = 0; // 滑动到指定view时，为了防止滑动时间长或者死循环，限制最大循环次数 private int mCycleCount = 0; private static final int MAX_CYCLE_COUNT = 1000; /** * 上边界阴影 */ private EdgeEffect mEdgeGlowTop; /** * 下边界阴影 */ private EdgeEffect mEdgeGlowBottom; /** * fling时，保存最后的滑动位置，在下一帧时通过对比新的滑动位置，判断滑动的方向。 */ private int mLastScrollerY; /** * 吸顶view是否常驻，不被推出屏幕 */ private boolean isPermanent; /** * 禁用子view的水平滑动，如果ConsecutiveScrollerLayout下没有水平滑动的下级view，应该把它设置为true * 为true时，将不会分发滑动事件给子view，而是由ConsecutiveScrollerLayout处理，可以优化ConsecutiveScrollerLayout的滑动 */ private boolean disableChildHorizontalScroll; /** * 自动调整底部view的高度，使它不被吸顶布局覆盖。 * 为true时，底部view的最大高度不大于 (父布局高度 - (当前吸顶view高度总高度 + mAdjustHeightOffset)) */ private boolean mAutoAdjustHeightAtBottomView; /** * 自动调整底部view的高度时，额外的偏移量 * 底部view需要调整高度 = 当前吸顶view高度总高度 + mAdjustHeightOffset */ private int mAdjustHeightOffset = 0; /** * 吸顶view到顶部的偏移量 */ private int mStickyOffset = 0; /** * 保存当前吸顶的view(普通吸顶模式中，正在吸顶的view只有一个) */ private View mCurrentStickyView; /** * 保存当前吸顶的view(常驻吸顶模式中，正在吸顶的view可能有多个) */ private final List<View> mCurrentStickyViews = new ArrayList<>(); // 临时保存吸顶的view，用于判断吸顶view是否改变了 private final List<View> mTempStickyViews = new ArrayList<>(); private int mOldScrollY = 0; private final List<View> mViews = new ArrayList<>(); private int mNestedYOffset = 0; /** * 普通吸顶模式,监听吸顶变化 */ private OnStickyChangeListener mOnStickyChangeListener; /** * 常驻吸顶模式,监听吸顶变化 */ private OnPermanentStickyChangeListener mOnPermanentStickyChangeListener; /** * The RecyclerView is not currently scrolling. * * @see #getScrollState() */ public static final int SCROLL_STATE_IDLE = 0; /** * The RecyclerView is currently being dragged by outside input such as user touch input. * * @see #getScrollState() */ public static final int SCROLL_STATE_DRAGGING = 1; /** * The RecyclerView is currently animating to a final position while not under * outside control. * * @see #getScrollState() */ public static final int SCROLL_STATE_SETTLING = 2; private int mScrollState = SCROLL_STATE_IDLE; // 这是RecyclerView的代码，让ConsecutiveScrollerLayout的fling效果更接近于RecyclerView。 static final Interpolator sQuinticInterpolator = new Interpolator() { @Override public float getInterpolation(float t) { t -= 1.0f; return t * t * t * t * t + 1.0f; } }; /** * 是否触摸吸顶view并且不能触发布局滑动 * 注意：它不仅会判断自己的吸顶view，也会判断下级ConsecutiveScrollerLayout的吸顶view */ private boolean isTouchNotTriggerScrollStick = false; /** * 在快速滑动的过程中，触摸停止滑动 */ private boolean isBrake = false; public ConsecutiveScrollerLayout(Context context) { this(context, null); } public ConsecutiveScrollerLayout(Context context, AttributeSet attrs) { this(context, attrs, 0); } public ConsecutiveScrollerLayout(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); TypedArray a = null; try { a = context.obtainStyledAttributes(attrs, R.styleable.ConsecutiveScrollerLayout); isPermanent = a.getBoolean(R.styleable.ConsecutiveScrollerLayout_isPermanent, false); disableChildHorizontalScroll = a.getBoolean(R.styleable.ConsecutiveScrollerLayout_disableChildHorizontalScroll, false); mStickyOffset = a.getDimensionPixelOffset(R.styleable.ConsecutiveScrollerLayout_stickyOffset, 0); mAutoAdjustHeightAtBottomView = a.getBoolean(R.styleable.ConsecutiveScrollerLayout_autoAdjustHeightAtBottomView, false);