boolean canScroll = view.canScrollHorizontally(1); 我的需求 使用一个 RecyclerView 实现了一个类似 Tab 效果,当这个 Tab 可以滑动时...首先想到的是 SDK 中自带的 View.canScrollHorizontally(intdirection) 接口,API 文档的解析为 Check if this view can be scrolled...API 的使用 一开始是直接调用 mCategoryReclycerView.setAdapter(mCategoryAdapter); if (mCategoryReclycerView.canScrollHorizontally...mCategoryReclycerView.postDelayed(()->{ if (mCategoryReclycerView.canScrollHorizontally...return; } if (mCategoryReclycerView.canScrollHorizontally
} if (mLayout == null) { return false; } final boolean canScrollHorizontally...= mLayout.canScrollHorizontally(); final boolean canScrollVertically = mLayout.canScrollVertically...mNestedOffsets[1] = 0; int nestedScrollAxis = ViewCompat.SCROLL_AXIS_NONE; if (canScrollHorizontally...int dy = y - mInitialTouchY; boolean startScroll = false; if (canScrollHorizontally...canScrollVertically() && Math.abs(dy) > mTouchSlop) && (getLayoutManager().canScrollHorizontally
final boolean canScrollHorizontally = mLayout.canScrollHorizontally(); final boolean canScrollVertically...mNestedOffsets[1] = 0; int nestedScrollAxis = ViewCompat.SCROLL_AXIS_NONE; if (canScrollHorizontally...final boolean canScrollHorizontally = mLayout.canScrollHorizontally(); final boolean canScrollVertically...() + 0.5f); int nestedScrollAxis = ViewCompat.SCROLL_AXIS_NONE; if (canScrollHorizontally...= SCROLL_STATE_DRAGGING) { boolean startScroll = false; if (canScrollHorizontally
if (linearLayoutManager.orientation == HORIZONTAL) { if ((xOffset <= 0 && canScrollHorizontally...(1)) || (xOffset >= 0 && canScrollHorizontally(-1))) { this.parent...return super.dispatchTouchEvent(event) } fun handleDefaultScroll() { val canScrollHorizontally...= canScrollHorizontally(-1) || canScrollHorizontally(1) val canScrollVertically = canScrollVertically...(-1) || canScrollVertically(1) if (canScrollHorizontally || canScrollVertically) {
. // 是水平还是垂直滚动 final boolean canScrollHorizontally = mLayout.canScrollHorizontally();...= SCROLL_STATE_DRAGGING) { boolean startScroll = false; if (canScrollHorizontally...NestScrollParent 的 onNestedPreScroll if (scrollByInternal( canScrollHorizontally...mVelocityTracker.computeCurrentVelocity(1000, mMaxFlingVelocity); final float xvel = canScrollHorizontally...TYPE_TOUCH); ->NestScrollParent的onStartNestedScroll ACTION_MOVE 开始分发嵌套滑动距离: dispatchNestedPreScroll(canScrollHorizontally
= (int) (e.getY() + 0.5f); int nestedScrollAxis = ViewCompat.SCROLL_AXIS_NONE; if (canScrollHorizontally...= SCROLL_STATE_DRAGGING) { boolean startScroll = false; if (canScrollHorizontally...mLastTouchY = y - mScrollOffset[1]; if (scrollByInternal( canScrollHorizontally
右滑(手指从右至左移动);负数:左滑(手指由左向右移动) * 您可参考ScaollView或HorizontalScrollView理解滑动方向 */ @Override public boolean canScrollHorizontally...MotionEvent.ACTION_MOVE: { int deltaX = (int) (event.getX() - lastX); lastX = event.getX(); // 滑动处理 if (deltaX 0 && canScrollHorizontally...(-1)) { scrollBy(-Math.min(getMaxCanScrollX(-1), deltaX), 0); } else if (deltaX < 0 && canScrollHorizontally
int[] out = new int[2]; //水平方向滚动,则计算水平方向需要滚动的距离,否则水平方向的滚动距离为0 if (layoutManager.canScrollHorizontally...RecyclerView.NO_POSITION; } int vDeltaJump, hDeltaJump; if (layoutManager.canScrollHorizontally...()) { //layoutManager是横向布局,并且内容超出一屏,canScrollHorizontally()才返回true //估算fling结束时相对于当前...layoutManager, @NonNull View targetView) { int[] out = new int[2]; if (layoutManager.canScrollHorizontally...layoutManager).getDecoratedMeasurement(currentView); int deltaJump; if (layoutManager.canScrollHorizontally
canScrollVertical) { this.canScrollVertical = canScrollVertical; } @Override public boolean canScrollHorizontally...() { return canScrollHorizon && super.canScrollHorizontally(); } @Override public boolean
(), getWidthMode(), getPaddingLeft() + getPaddingRight() + widthUsed, lp.width, canScrollHorizontally
, View targetView) { int[] out = new int[2]; //判断支持水平滚动,修改水平方向的位置,是修改的out[0]的值 if (layoutManager.canScrollHorizontally
ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT); } } 2.打开滚动开关 接着,对滚动方向做处理,重写canScrollHorizontally...@Override public boolean canScrollHorizontally() { return true; } 3.对RecyclerView进行初始化布局 好了,
{ int[] out = new int[2]; // 如果是水平方向滚动的,则计算水平方向需要移动的距离,否则水平方向的移动距离为 0 if (layoutManager.canScrollHorizontally...return findCenterView(layoutManager, getVerticalHelper(layoutManager)); } else if (layoutManager.canScrollHorizontally...估算出水平方向 SnapHelper 响应 fling // 对齐要滑动的 position 和当前 position 的差,否则水平方向滚动的差值为 0 if (layoutManager.canScrollHorizontally...RecyclerView.LayoutManager layoutManager, View targetView) { int[] out = new int[2]; if (layoutManager.canScrollHorizontally...layoutManager) { if (layoutManager instanceof LinearLayoutManager) { if (layoutManager.canScrollHorizontally
v.view.canScrollHorizontally(-1)) || (!
(e.getY() + 0.5f); int nestedScrollAxis = ViewCompat.SCROLL_AXIS_NONE; if (canScrollHorizontally...scrollByInternal 方法里面会回调 onNestedScroll 方法 if (scrollByInternal( canScrollHorizontally
itemSize + itemSize ) currentWidth += itemSize } } } } //因为这个布局不需要有滚动,所以直接将横竖两个方向的滚动全部取消了 override fun canScrollHorizontally
mScrollOffset[0]; mLastTouchY = y - mScrollOffset[1]; if (scrollByInternal( canScrollHorizontally
ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT); } @Override public boolean canScrollHorizontally
Math.max(0, childBottom - parentBottom); final boolean canScrollHorizontal = getLayoutManager().canScrollHorizontally
getPaddingRight() + lp.leftMargin + lp.rightMargin + widthUsed, lp.width, canScrollHorizontally
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