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Simplifying clear-all transparency calculation

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Bug: 78788182
Change-Id: Idb66629f0dcc09240f38f37554a7ff50dbeefb7d
Testing: Manual
This commit is contained in:
Vadim Tryshev
2018-05-07 18:15:12 -07:00
parent d10001b5d6
commit 68277f0568
1 changed files with 4 additions and 17 deletions
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21
quickstep/src/com/android/quickstep/views/RecentsView.java
View File

@@ -327,25 +327,12 @@ public abstract class RecentsView<T extends BaseActivity> extends PagedView impl
final int childCount = getChildCount();
if (mShowEmptyMessage || childCount == 0) return 0;
final View lastChild = getChildAt(childCount - 1);
// Current visible coordinate of the end of the oldest task.
final int carouselCurrentEnd =
(mIsRtl ? lastChild.getLeft() : lastChild.getRight()) - getScrollX();
// Visible button-facing end of a centered task.
final int centeredTaskEnd = mIsRtl ?
getPaddingLeft() + mInsets.left :
getWidth() - getPaddingRight() - mInsets.right;
// The distance of the carousel travel during which the alpha changes from 0 to 1. This
// is the motion between the oldest task in its centered position and the oldest task
// scrolled to the end.
final int alphaChangeRange = (mIsRtl ? 0 : mMaxScrollX) - getScrollForPage(childCount - 1);
final int scrollEnd = mIsRtl ? 0 : mMaxScrollX;
final int oldestChildScroll = getScrollForPage(childCount - 1);
return Utilities.boundToRange(
((float) (centeredTaskEnd - carouselCurrentEnd)) /
alphaChangeRange, 0, 1);
((float) (getScrollX() - oldestChildScroll)) /
(scrollEnd - oldestChildScroll), 0, 1);
}
private void updateClearAllButtonAlpha() {