/**
* @param startChild View closest to start of the list. (top or left)
* @param endChild View closest to end of the list (bottom or right)
*/
static int computeScrollOffset(
RecyclerView.State state,
OrientationHelper orientation,
View startChild,
View endChild,
RecyclerView.LayoutManager lm,
boolean smoothScrollbarEnabled,
boolean reverseLayout) {
if (lm.getChildCount() == 0
|| state.getItemCount() == 0
|| startChild == null
|| endChild == null) {
return 0;
}
final int minPosition = Math.min(lm.getPosition(startChild), lm.getPosition(endChild));
final int maxPosition = Math.max(lm.getPosition(startChild), lm.getPosition(endChild));
final int itemsBefore =
reverseLayout
? Math.max(0, state.getItemCount() - maxPosition - 1)
: Math.max(0, minPosition - 1);
if (!smoothScrollbarEnabled) {
return itemsBefore;
}
final int laidOutArea =
Math.abs(orientation.getDecoratedEnd(endChild) - orientation.getDecoratedStart(startChild));
final int itemRange = Math.abs(lm.getPosition(startChild) - lm.getPosition(endChild)) + 1;
final float avgSizePerRow = (float) laidOutArea / itemRange;
return Math.round(
itemsBefore * avgSizePerRow
+ (orientation.getStartAfterPadding() - orientation.getDecoratedStart(startChild)));
}
static int computeScrollOffset(
RecyclerView.State paramState,
OrientationHelper paramOrientationHelper,
View paramView1,
View paramView2,
RecyclerView.LayoutManager paramLayoutManager,
boolean paramBoolean1,
boolean paramBoolean2) {
int i = 0;
int j = i;
if (paramLayoutManager.getChildCount() != 0) {
j = i;
if (paramState.getItemCount() != 0) {
j = i;
if (paramView1 != null) {
if (paramView2 != null) {
break label45;
}
j = i;
}
}
}
return j;
label45:
i =
Math.min(
paramLayoutManager.getPosition(paramView1), paramLayoutManager.getPosition(paramView2));
j =
Math.max(
paramLayoutManager.getPosition(paramView1), paramLayoutManager.getPosition(paramView2));
if (paramBoolean2) {}
for (i = Math.max(0, paramState.getItemCount() - j - 1); ; i = Math.max(0, i)) {
j = i;
if (!paramBoolean1) {
break;
}
j =
Math.abs(
paramOrientationHelper.getDecoratedEnd(paramView2)
- paramOrientationHelper.getDecoratedStart(paramView1));
int k =
Math.abs(
paramLayoutManager.getPosition(paramView1)
- paramLayoutManager.getPosition(paramView2));
float f = j / (k + 1);
return Math.round(
i * f
+ (paramOrientationHelper.getStartAfterPadding()
- paramOrientationHelper.getDecoratedStart(paramView1)));
}
}
