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fix strange space at the top when FlexWrap (#522) #530

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fix strange space at the top when FlexWrap (#522) #530

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168c1f4
fix strange space at the top when FlexWrap (#522)
sheckspir Jan 15, 2020
7e746e0
Merge remote-tracking branch 'google/master' into bf_522
sheckspir Jan 18, 2020
d773dd6
special using of orientationHelper for NOWRAP flexWrap. Add some test…
sheckspir Jan 22, 2020
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24 changes: 17 additions & 7 deletions flexbox/src/main/java/com/google/android/flexbox/FlexboxLayoutManager.java
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Original file line number Diff line number Diff line change
Expand Up @@ -1076,8 +1076,14 @@ private boolean updateAnchorFromPendingState(RecyclerView.State state, AnchorInf
anchorInfo.mPosition = mPendingScrollPosition;
anchorInfo.mFlexLinePosition = mFlexboxHelper.mIndexToFlexLine[anchorInfo.mPosition];
if (mPendingSavedState != null && mPendingSavedState.hasValidAnchor(state.getItemCount())) {
anchorInfo.mCoordinate = mOrientationHelper.getStartAfterPadding() +
savedState.mAnchorOffset;
if (isMainAxisDirectionHorizontal()) {
anchorInfo.mCoordinate = mOrientationHelper.getLayoutManager().getPaddingTop() +
savedState.mAnchorOffset;
} else {
anchorInfo.mCoordinate = mOrientationHelper.getStartAfterPadding() +
savedState.mAnchorOffset;
}
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I think this is not a correct way to fix the issue.

Actually some of the tests in FlexboxLayoutMangerTests are failing after patching this PR.

Couldn't look into the issue carefully, but I guess what needs to be cared is not whether the main axis direction is horizontal, but whether the flex wrap is nowrap.

Log.d("TAG","1updsteFromPendingState.mCoordinate = " + anchorInfo.mCoordinate);
anchorInfo.mAssignedFromSavedState = true;
anchorInfo.mFlexLinePosition = NO_POSITION;
return true;
Expand Down Expand Up @@ -1121,7 +1127,10 @@ private boolean updateAnchorFromPendingState(RecyclerView.State state, AnchorInf
}

// TODO: Support reverse layout when flex wrap == FlexWrap.WRAP_REVERSE
if (!isMainAxisDirectionHorizontal() && mIsRtl) {
if (isMainAxisDirectionHorizontal()) {
anchorInfo.mCoordinate = mOrientationHelper.getLayoutManager().getPaddingTop()
+ mPendingScrollPositionOffset;
} else if (mIsRtl) {
anchorInfo.mCoordinate = mPendingScrollPositionOffset
- mOrientationHelper.getEndPadding();
} else {
Expand Down Expand Up @@ -1445,9 +1454,7 @@ private int layoutFlexLineMainAxisHorizontal(FlexLine flexLine, LayoutState layo
int parentWidth = getWidth();

int childTop = layoutState.mOffset;
if (layoutState.mLayoutDirection == LayoutState.LAYOUT_START) {
childTop = childTop - flexLine.mCrossSize;
}

int startPosition = layoutState.mPosition;

float childLeft;
Expand Down Expand Up @@ -2878,7 +2885,10 @@ private void reset() {
}

private void assignCoordinateFromPadding() {
if (!isMainAxisDirectionHorizontal() && mIsRtl) {
if (isMainAxisDirectionHorizontal()) {
mCoordinate = mLayoutFromEnd? mOrientationHelper.getLayoutManager().getPaddingBottom()
: mOrientationHelper.getLayoutManager().getPaddingTop();
} else if (!isMainAxisDirectionHorizontal() && mIsRtl) {
mCoordinate = mLayoutFromEnd ? mOrientationHelper.getEndAfterPadding()
: getWidth() - mOrientationHelper.getStartAfterPadding();
} else {
Expand Down