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Update FlowLayoutManager.java #11

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Update FlowLayoutManager.java #11

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13 changes: 10 additions & 3 deletions layoutmanager/src/main/java/com/mcxtzhang/layoutmanager/flow/FlowLayoutManager.java
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Original file line number Diff line number Diff line change
Expand Up @@ -165,7 +165,10 @@ private int fill(RecyclerView.Recycler recycler, RecyclerView.State state, int d
}
//添加完后，判断是否已经没有更多的ItemView，并且此时屏幕仍有空白，则需要修正dy
View lastChild = getChildAt(getChildCount() - 1);
if (getPosition(lastChild) == getItemCount() - 1) {

View firstVisibleChild = getChildAt(0);
//要做底部修复，还要满足下面第一个条件：第一个显示的View的top在屏幕之外
if (firstVisibleChild.getTop() < 0 && getPosition(lastChild) == getItemCount() - 1) {
int gap = getHeight() - getPaddingBottom() - getDecoratedBottom(lastChild);
if (gap > 0) {
dy -= gap;
Expand Down Expand Up @@ -227,9 +230,13 @@ public int scrollVerticallyBy(int dy, RecyclerView.Recycler recycler, RecyclerVi
View lastChild = getChildAt(getChildCount() - 1);
if (getPosition(lastChild) == getItemCount() - 1) {
int gap = getHeight() - getPaddingBottom() - getDecoratedBottom(lastChild);
if (gap > 0) {


View firstVisibleChild = getChildAt(0);
//当前显示的第一个View的top小于零，说明该recyclerview发生了滚动，可以做底部修复
if (gap > 0 && firstVisibleChild.getTop() < 0) {
realOffset = -gap;
} else if (gap == 0) {
} else if (gap == 0 || firstVisibleChild.getTop() >= 0) {//当前第一个显示的top大于等于0，并且最后一个显示的就是最后一个，那一定不需要滚动了，即使gap！=0，也不需要修复
realOffset = 0;
} else {
realOffset = Math.min(realOffset, -gap);
Expand Down